Modern Mechanix, March 1933

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All WAVE RADIOS a NEW LOW PRICES [IS to §-TUBE Up goes the quality! Down goes the price! Midwest has scored another tremendous hit by bringing the ALL- WAVE radio within reach of every buyer. For only $18.50, radio fans can buy this &-tube LONG and SHORT wave super-heterodyne chassis, completely as- sembled with electro- dynamic speaker. Never before such sensational value. Never before so much radio for so little money. Six months ago, such quality and such prices would have been impossible. Think of it! Super power, four distinct wave bands, 15 to 560 meter tuning range, coast-to-coast reception, police i calls, foreign reception . all for as little as $18.50. Only Midwest radio engineering skill backed by the en- gineering talent of R.C.A. and Am. T. & T. could produce such sensational radio value. Mail the coupon or write us a postal. You'll be amazed when you get full details. What Midwest Owners Say 3. S. Kline, McGeehee, Ark.—“Listened to a set costing $150.00 but would not swap my Midwest for the higher priced one." A. Edwards, 2125 North A St., Elwood, Ind.—“We wouldn't trade our Midwest for any of the numerous more costly sets." Emmet Berry, 222 29th St., Ashland, Ky.— "The Midwest cannot be beaten by any other radio that costs twice as much." Milton T. Lyman, 2525 Merwin St., Shreve- Dea COMPLETELY ASSEMBLED LARGE SPEAKER port, La.—‘‘Just as good as sets selling: for double Midwest prices." Walter Fahrig, 1304 Highland Ave., Alton, {ll.—*‘Midwest is the best. Friends think I paid about $300 for it." H. R. Peper, 436 Ferry St., New Haven, Conn. A neighbor of mine who redently purchased a $200.00 radio went home very much dissatisfied after listening to our Midwest." Direct With Factory-Save ro 507, Midwest sweeps aside the costly old-fashioned way of selling through distributors and dealers. You buy direct from the Midwest factory. You save the middlemen's profits. Investigate! Mail the coupon. Get the Midwest NEW CONSOLE MODELS AS LOW AS 94 .85 Also amazing new long wave console radio at a sensationally low price. Six new type tubes, COMPLETE WITH TUBES . . catalog. Learn the facts about the new Midwest dynamic speak- Midwest Radio 8-tube ALL-WAVE sets—also 6-tube sets, Bat- eo a a Corp. tery sets and new Automatic Record Chang- youne control Dept. 192 ing Radio-Phonograph at an extremely low aei price. Learn about our sensationally low factory prices, easy payment plan and positive guarantee of satisfaction or money back. Get a ute features Cincinnati, Ohio. found in sets Without obligation on my part selling for send me your new 1933 catalog, and bigger, better, more powerful, better toned $75.00 to poe acs n our He oe radio~at a positive saving of 30% to 50% ! $100.00. Don’t ree trial offer. s is an order. buy, any radio until you get all T O E a E MIDWEST [piesa the. coupon or PIRES «Foss, 5S ae BR BOO Re Oe RADIO CORP. write us a pos- 4 tal now. Wd are aka aah nee State... ..e.s (Est. 1920) Dept. 192 Cincinnati, Ohio

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FYOURE if If you are over 40, your case is not hopeless—but, frankly, re- adjustment is more difficult. IT 1s highly probable we are in the beginning of a new economic era. Old customs are passing, new standards are being inaugurated. Things that were good yesterday and are passable to- day will be obsolete tomorrow. If you are 40 or under, you have absorbed the background of the old era but are not so fixed in your habits that you cannot adjust yourself to the new order and profit by this readjustment. You can forge ahead without remembering too much about the "good old days." You can ac- cept the future as a challenge rather than view it as a comparison. Success can be a bright pic- ture on your horizon. Repeat that word—can/ Success can be a bright picture if you paint it with your own ability, your determination and —-adequate training! And without this training OR UNDER you are lucky! you will be lost! Training to do a job letter is the demand of this decade. And the magni- tude of this demand is increasing every day. How can you get this training? Not entirely by applying yourself to the job at hand. Your outlook must be broader. Your training must be in advance of your opportunities. This is why far-seeing men, in all professions and all lines of work, are enrolling for training courses with the International Correspondence Schools. For forty years this institution has been a practical educa- tional force in the lives of ambitious men. Today its service is more valuable than ever. Are you interested in this service and how it can help you be more secure how you can make greater progress and earn more money? Then the coupon here challenges your consideration! INTERNATIONAL CORRESPONDENCE SCHOOLS "The Universal University" BOX 2320-S, SCRANTON, PENNA. * Without cost or obligation, please send me a copy of your booklet, "Who Wins % and Why," and full particulars about the subject before which I have marked X: TECHNICAL AND INDUSTRIAL COURSES D Machinist [Jj Architect G Patternmaker {J Architectural Draftsman Building Estimating L]\Wood Millworking LE) Contractor and Builder O Structural Draftsman ElStructural Engineer Bridge Engineer { ]Aviation Engines D Toolmaker Pipefitter (J Tinsmith G Bridge and Buildins Foreman [JGas Engines O Diesel Engines CIR. R. Locomotives OR. R. Section Foreman . R. Bridge and Building Foreman [J Air Brakes D Train Operation L) Highway Engineering D Chemistry D Pharmacy OCoal Mining Engineer - []Electric Wiring D Electrical Engineer {] Electric Lighting {_] Welding, Electric and Gag [} Reading Shop Blueprints [)Telegraph Engineer [ {Telephone Work [LJ] Mechanical Engineer Ll Mechanical Draftsman Automobile Mechanic Plumbing _ O Steam Fitting G Heating [O Ventilation G Sheet Metal Worker L]Steam Engineer Navigation Boilermaker LJ Textile Overseer or Supt D Cotton Manufacturing D Woolen Manufacturing G Steam Electric Engineer D Agriculture D Fruit Growing Q Ciril Engineer f L) Poultry Farming G Surveying and Mapping B Radio CJRefrigeration Marine Engineer BUSINESS TRAINING COURSES (JBockkeeping © Secretarial Work l G Spanish D French G Industrial Management []Salesmanship [D Advertising O Personnel Management (Wallpaper Decorating D Traffic Management Á £L} Accountancy and C.P.A, Coaching C Cost Accountant Business Management : O Complete Commercial [1 Office Manayement E)Civil Service _{) Mail Carrier E]Railway Mail Clerk EJ Grade School Subjects Salesmanship Lj High School Subjects DBusiness Correspondence (3College Preparatory ; [Lettering Show Cards Signs [illustrating [j Cartooning C)Stenugraphy and Typing C Lumber Dealer Address... POET TEER ES COTE AE EAR REESE REL tetestetet CUY ia N Pepin ectesetten OPE UPON) OF aiuichctsinauarecutioonn oeecuess EPE ti If you rffiiie in Canada, send this coupon to the International Correspondence Schools Canadian, Limited, Montreal, Canada FOCRSESTEEH BPSD SHRR ED CI a re a nga Thank You for Mentioning Modern Mechanix and Inventions for March When Writingto Advertisers 3 8bitD ownload.com

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March, MODE RN DONALD COOLEY s MEGINNI sce VOLUME IX PRICE 15 CENTS NUMBER 5 AND IRMERTNONS 20 Cents in Canada Yearly subseription, $1.50 a year in U. S. and possessions. Now J 5c CONTENTS for MARCH SPECIAL FEATURES

Subscribers whose subscriptions were entered at the old rate

of $2.50 per year will have them extended at the new rate.

Mechanical Genius Makes and Breaks Counterfeit Rings By Howard Ameli - 38 Technocracy—Gospel of the Machine - - ee ee Animals Tricked Into Talking for the Movies- >- By Charles Murphy - 46 You Can Be an Expert Rifle Shot — - - = - - By Morris Fisher ~ 54 1000 Ways to Make a Living - T a # ¢ -s e & #& & = 62 Parlor Magic With Cigarettes - - - = - > - © By WestonFarmer - 102 Listen in on Police Crime War With Broadcast Set - By Thornton Hallet - 108 Gravity Whirls This Fascinating "Flutter-round" - = + By Dick Cole - 112 How to Build a Kyack se ee By Sam Rabl — > 117 SHORTER FEATURES Utility Flashlamp for Home - - te 4 50 . . Clear View Camper's Telescope - 51 Synthetic Scenery Eliminates Movie Sets 51 No More Thrillsfor Firebugs > 52 Oddities of Science - 53 . i i . Airplane Panel for Blind Flying - : . 52 By Nic Sprank . , , ' Antenna Reduces Man-made Static > -> 52 Aerial Boulevard to Speed City Traffic - 59 . . ! X-ray Turns Out Picture for 60 Cents : 58 Latest Inventions for Household Convenience 60 ; f What Does Your Voice Look Like? =- - 58 Hobby Department - 80 , : : Shi ; an Grating Is Non-skid Road Surface - - = 58 ips Lifted Bodily in Elevator = 83 Vi : L l ibrator for Milady’s Beauty - ; : 60 Fortunes Waiting for Inventors - 128 he ees Colonial Houses Are Most Popular _ 139 Pan Poaches Eggs Square-shaped > - > 60 Stopper for Sink Is Filter Also - : - 60 NEW MECHANICAL INVENTIONS Sanitary Dispenser for Catsup . . . 60 Vacuum Washer for Pipes . - : 61 Sight Reading Chart Makes Music Lessons Egg Opener Is Handy for Kiichen ; 61 Easy - 42 Humidor, nd Pipe Stoker in One . ‘ 61 Pipe Is Pileci Tei Gas Gan e 42 Shee Curs French Fries - . - 61 New Wheels for Giant Moguls . - 42 World's I. rpest Windmill at Chicas Fair . 70 Device Detects Gas From a Distance 50 Panting n Wood Is Newest Art - i 70 Lamp Sunburns in 20 Minutes SO Diagon Key Prevents Burglary . . 70 (Continued on page Gt

Published monthly by Modern Mechanix Publishing Ca. at SP9 Trh street Se) Minneapolis, Minnesota. MODERN MECHANIX AND INVENTIONS entered as second class matter September fark obeys oat the Pot alien Minneapolis, Minnesota, under the act of March 3rd, 1879. Jack Smalley, Managing Eeitar, Copyright T932. Adyatibang Oie Chicane offtee, 85) East Wacker Drive (Phone State 2955); New York office, 52 Vanderbilt Avenue, Room To Phone Maras Manh ¥ t99 ATP mianuseripts should be addressed to our editorial office at 529 So. 7th Street, Minneapolis, Minn. Mirna oerapt). with met be opeturuerd aubes accompanied by return postage. Advertising forms close on the 20th of the third preceding iienth. Pries Pa cent) aocomy . Yl od a ver in ite United States and possessions. In Canada, 20c per copy, per year $2.25. Other Postal Ualions, F200 per year Printed in bo oS A. 8bitD ownload.com

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A 300% Increase! From S75 a month to S300 and more per month — that’s the Jump, . B. Scholes made thru N. S. T. A. Credits N. S. Worth $5,000 To Him “Ewoulkdgna’t take $5.000 for what you've done (or me," writes (3. 1$ Sterling. "Your training has actually ìn- e] , ‘ erenn] my income“ over T. A. training with his success voor Shortly atter enroll- and N T. A. Employment ing, he led the sales force of Department for his present Bis company, big pay job. ` sLastYears Pay Looks 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. T. A, training. In his first 3 months he had made more money than in two years at his old job. $5,000 A Year! Ask J. A. Ferland if N. S. T. A. training pays. A French- Canadian railroad man—liitle education in English, N. S. T. A. training won him a sales managership at $5,000 a year to start. Like Small Change to These Doubled His Pay A. Robitaille found in N. S. T. A. training "a lifetime of selling experience.’ "My earn- ings have jumped to 100% more than I got at the time I began studyin our course.” 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 from $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 message! selling profession. This book When a man who proved that Master Salesmen His Own Bass— At Doubled Wages "I'm my own boss now,” proudly writes W. Hayes, an . S. T. A. graduate, "Since taking this course I have mare than doubled my income.’’ In one week three other con- cerns tried to hire him away from his job. has been struggling along in a low-pay job suddenly steps out and starts earning real money—$5,000, $7,500 or $10,- OOO 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 ewn problem. If so. all the more reason to send for these two books: "The ay To Master Sales- manship" and "Mistakes Commonly Made In Selling.’’ See for yourself what done for thousands Send for salesmanship has done | already ; see how this training has brought [ksscnat Setesmen's Training Associaton are made, not "born." It told facts and secrets about mon- . ey-making that were a 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 opportunit 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 "lucky." He was. But his "luck" la in his decision to cast his lot with the N.S.T.A. Thousands of other men have been a "lucky." Some report increases ranging up to 900%. They have forgotten the days when they were caught in the rut—but t ey never forget that they owe a great part of their success to N.S.T.A, training. NATIONAL SALESMEN'S TRAINING ASSOCIATION Dept. C-705, 21 W. Elm St. Chicago, ITI. m l l l to qualify as a Master ational Salesmen's Training Association, ept. C-705, 21 W. Elm St., Chicago, IL Without cost or obligation I wili accept copies of your books “The Key To Master Salesmanship” and “‘Mis- takes Commonly Made In Selling,” with details of your System of Training and Free Employment Service. ; sudden success to men who thought they J | Name.........cccce ccccuncscecececccteenuntnnns | } were doomed to failure, after disappoint- Name. oo... sees eee vee. i ing experiences in sales work. No matter Add comenenty © What your experience has been, or what TESS eee ween e are ene ee >. i men : your present thoughts on selling are, send DEOR for these two books today and learn these Ciena e ee aa E a E StatGsc seaweeds | #0 amazing new facts. Maii the coupon , now! ABO ris tena wd vas OCCUPAHOM s.324 sete. Kegs eeie es | opp ee ee ee ee eee ee ee ee ee eee -e r eee -$ pe: Thank You for Mentioning Modern Mechanix and Inventions for March When Writing to Advertisers 5 8bitD ownload.com

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TABLE OF CONTENTS Continued From Page 4

Life Belt Saves Victim at 10 mph. - + 71 Deaf Hear Through Head Bone - - - 71 Pocket Sunwatch for Wanderers - > - 71 Frenchman Invents PEPEL Motion Machine - - . Time Saving Switchboard for Electricians z Neon Tube for Night Signalling = ~- Picture Making Through a Pinhole - - Let's Build a Bird House - - - _ 2 Magnetized Hammer Makes Glass Setting Easy - - - - - - - Modernistic Book Case Has Simple Lines - Universal Bench Lathe Indicator - - AVIATION The Why of Autogiro Superiority - ° - Airports Modernize With Huge Clocks - Propellerless Plane Flies any Direction - Flying Barrel to Carry 100 Passengers - 119 120 120 122 125 126 126 127 79 76 z / = Z The Shop Mai! Box will be Found this Month on Page 10 HANDIKINKS Sewing Machine Replacement Makes Grinder Electric Refrigerator Repair Making Glassware Heatproof Safety Guard for Flour Bin Two Kinks for the Kitchen Collapsible Drainboard Folds Out of Way - Child's Teeter-totter for Outdoors Rubber Stamp From School Eraser - - A Loud Speaker Phonograph Windowpane House Shows Bird Life - =- How to Make Wood Dowels in Quantity - Puller for Gib-keys Works Like Hammer ~ - Tubing Keeps Mist Off Windshield - Target Trap From Model T Parts - = Range Finder for a Kodak - - - - Faking Water Reflection on Photo - Moist Air Feed for the Car Warning and Ad Message in One - Shelving May be Hung from Picture Molding Elevator Shelf Makes Cupboard Convenient Self-tightening Clothesline Holder Amusing Toy Rocker for Children ° - To Adjust Gas Range Flame INTERESTING Ia Why Cannibals Relish Human Meat - Slickers Can’t Go Back to Farm Right Diet Is Key to Long Life Gov't Urged to Subsidize Health U, S. Time World's Most Accurate - - You'll Catch Cold in Any Climate = ° Man's Head Is Natural Radio Set . - Bed Bugs Show We Lived in Caves - - Vanadium Found in Sea Squirts - - - EDITED BY EXPERTS Douglas Rolfe oe oe listed here are the Plane Talk Editer members oft the Raymond F. Yates Modern Mechanix Patent Expert Board of Pditors, all cpialrfed! by natronal repute to serve : a. authorities They will pladly answer questions from Pilot Gene Shank y i Weston Fartner Famous Aviator, Holder of readers if stamped envelope is wnr Address them in Consulting Editor Light Plane Enirinte care of this mapazine, 929 S 7th St., Minneapolis, Minn. 8 Blight Record A. Neely Hall Ray F. Kuns J. Russell Dye Aulner of "The IH» < rafts- Prinecelpal, Cincinnati Aute Associate Editor S. S. Rabil man,” ete motive Trade Sehool Seaplane Desipner ami L. B. Robbina . Roger Fawcett Naval Architect Nationalis Krowa Radio Alfred Albelli Eypert

4 Associate Editor New York Editor 8bitD ownload.com

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The Chance of a Lifetime— It's Calling You—Are You Ready? "THINGS are breaking fast in busi- ness today. Management is check- ing testng—every method and every man, Whole regiments of old employes are being swept out—and new blood is coming in. Privates are moving up toward presidents' chairs, and high executives are falling back toward clerical desks. Old companies are going ouit——new companies are springing up. Change, change, change—in a resolute cHort to meet the new conditions of today—and tomorrow. And each change, as it occurs, fairly shouts at you—‘‘Hlere is opportunity— stfp in NOW, and make your bid for power!” Times of change are times of prog- ress—for the man who really wants to get ahead. In good times, staffs and policies were fixed—what matter that _ you were a better man or had a better plan—business was booming, why make a change? Hut the depression has burst the door wide open. The better man 1s sought—is given a chance—and if he succeeds, if he delivers results, he can practically name his own reward. Not only higher pay and advancement, now, but—whatis more important—a choice spot on the crest of the wave when the business tide returns. We ect proof of this every day, as hundreds of LaSalle-trained men and women report progress. Pay raises while fellow-workers are being cut— rapid advancement, new responsibili- ties and opportunities—the result of training for today's new needs. LaSalle Extension University Dept. 3493-R, Chicago I would hke to have your special booklet—without any cost of obligation to me—about my eee and your suc- have checked. O Industrial Management O Modern Foremanship O Personnel Management / D Business Correspondence |? Ci Business English ja O Effective Speaking ie Office Management m {] Credit and Collection Corres. ™ <vss trang in the business field UO Business Management lligher Accountancy Vrathe Management Miniern Salesmanship law: Degree of LL.B. Clonosmens lul Law BFapert Bookkeeping Oo C. P. A. Coaching í O Stenot i I] 1] 1] [j 1] [] li CGormemern ial Spanish 1] At the right are a few incidents*— picked from hundreds—and each is a direct challenge to you to do likewise. If You Have the WILL We Will Provide the Way Now—how about yourself? You can hardly name any great American fortune, or point to any out- standing executive whose success foun- dation was not laid during a period of business change. Periods of change— unsettled conditions like the present— are periods of unusual opportunity. Only get this straight—to succeed today and tomorrow requires more knowledge and ability than were neces- sary in the past. It means preparation —organized preparation—training. ONCE in a Lifetime This great transition in business— this wide-open attitude on the part of management—may not last much longer. It is not likely to occur again during your hifetime—or if it does occur, you will be older and with less time to enjoy its benefits. Your time to act is now. Bigger jobs, bigger pay, greater recognition—they are waiting now for the man with the courage to qualify. Will you grasp them, or see them fade away as prosperity returns? What you do with the coupon below is your answer. Mail it today! * Names and addresses gladly given \ g on request. “ooa

anr Tgi 3 ` $ $ wet You Can Win PRO- MOTIONS—PAY RAISES—Like These NOW

September 12, 1932 “LaSalle training — one-fourth com- pleted—has just won for me a pro- motion to Local Manager of my com- pany." W. K. L. July 21, 1932 "I have just been called from the factory and placed in charge of the office with the title of Treasurer. A . Without my LaSalle training, I would be completely lost, and an op- portunity would have slipped through my fingers." j. L. Sept. 29, 1932 "Today I was informed that my salary is increased 25 percent— effective October 1." L. S. W August 27, 1932 "Since I began my _ training, I have received two salary increases. I think that is a record, considering the de- pression and the fact that I only began studying in June." V. B, September 1, 1932 "Less than a year ago, when I started LaSalle training. I was a bookkeeper. A few weeks atter my start, I was of- fered a position with a firm of accoun- tants at a considerable increase in salary. Last February I was appointed Town Treasurer and Accountant. After that my salary was increased until it is four times what it was last Fall." G. L. W. September £5, 1932 "During the past two and one-half years, I have had three promotions and where others in the firm were getting salary cuts, I have had increases." D. W.E. Ask for one of these booklets— or a similar one on your own field of business. They are free.

py £E a Banking wml Finance Q Chain Store Management see ae h ce Naane . ...LLe. Sh peste Sr se Age... —— a A Potion A E EEE E E EE AEA A E E E AE E ae coe eke LaS alle : = = 2 Addie Eerie eee Extension University =H npe Thank Jou for Mentiening Modern Mechanix and Intentions for March W ken W riting to Advertisers 7 8bitD ownload.com

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Breedcasting Stations «mploy truined Meu continually for jobs paying up to $5,000 a year. Police Departments arc finding Radio g great id im their work.. Many good jObs nave been made in this new field. a Spare time set servicing pay: many N, R. L men $200 to $1,000 a year. Full time men Maks as much as $65. $75, $100 a week. Talking Movies—an invention nude possitjje by Radic—employs many well traineg radio men for jobs paying $75 to $200 a week. year. Radio manufacturers employ testers, in- § TEMA OLT ATN: Many Make ‘50 to ‘100 a Week in Radio -° the Field With a Future My book, "Rich Rewards in Radio," 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 train- ing. 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, $156, and $200 a week, Radio—the Held with a future Ever so often a new business is started. You have seen how the men who pot into the automobile, motion picture, and other industries when they were started had the first chance at the 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 i many more wealthy in the future. You will be kicking yourself if you pass up this once-in- a-lifetime 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 giveyouin 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 instructions, which you should master quick- ly, for doing 28 Radio jobs common in most every neighborhood. Throughout your Course I # will show you how to do other repair and service § jobs on the side for extra money. 1 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., Nashville, Tenn., writes : "I made $935 in my spare time while taking your Course." Get ready for jobs like these Broadcasting stations use engineers, opera- ġ tors, station managers and pay up to $5,000 a § SAMPLE LESSON FREE! & I'll send you a Free Lesson to prove E j that my Radio Course is easy, prac- G tical. That's how confides am @ ' that- I cm train YOU at home ing fF your spare time to became a Radio Ñ fF expert. Only my students eould have § } this book in the past. 1 KNOW that? when you see it, read it, examine H it, you will be delighted with Us ķ a dear, simple way ofteaching Radio, 1ff F iCNOW—because J have ALREADY } # trained thousands of men. Many of E ‘them with not eren a grammar school education, and no Radio or f electrical experience, have become x Radio experts and earn two or three times their former pay. Mail the 4 coupon now. IC : Engineer $400 Each Month $800 in Spare cnet T os "I spent fifteen years as Time "| have a nice position and am get- traveling salesman and was "Money could not pay fer ting a good salary as Chief Engineer making good money but what I got out of your See parr ee Before lau could see the oppurtunities course. I did not know $1000.00 a MO ee 000. year. It is now $2,400.00 in Radio. Believe me I am a single thing about à year. Before entering Radio, my net sorry, for J have made Radio before I enrolled, work was, more or less, a drudgery— more money than ever he- but I have made $800 in itisnewapleasure. All of this isthe i fore. I have made more my spare time although result of the N.R.I. training and 7 than $400 each month and my work keeps me away study. Your course is by farthe sim- ; from home from 6:00 plest, clearest I have yet seen. You got z it really was your course A. M. to 7:00 P. M me my first important position. After — i i that brought me to this. I ins le I accepted this position a number of Television—the coming field of many great Can't say too much for your Every word I ever read others were offered to me as the re- opportunities—is covered by my course. school. sT. G. Ðahlstead, about your course I have sult of the efforts of your Employ- Radio Station KYA, San found true.” Milton I. ment Service." H. H. Lance, Radio Francisco, Cal. Leiby, Jr., Topton, Pa. Station WOS, Jefferson City, Mo. och n> es 8 Thank You for Mentianing Modern Mechanix and Inventions for March When Writing to Advertisers 8bitD ownload.com

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TO BE A RADIO EXPERT Act Now --- Mail Coupo for Free Book of Facts npectoru, foremen, engineers, service men, buyers, and managers for oba paying up to $6,000 a year. Radio dealers, jobbers (there are over 15,000} employ service men, salesmen, buyers, managers and pay up to $100 a week. Talking pictures pay as much as $75 to E200 uo week to men with Radio training. There are hundreds of opportunities to have a spare time or full time Radio business of your own. I'll snow you how to start your own business on money made in pure time while learning. My book tells you of other opportunities. Yon can learn at home in your spare time to be a Radio Expert Hold your job. There is no need foryouto leave home. I will train you quickly andinexpensively during your spare time. You don't havetobea hih school or college graduate. My Course is written in a clear, inter- esting style that most anyone can grasp. Igiveyou 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 oE Short Wave, Television, Talking Pictures, Set Servicing, Broadcasting I'll give you more training than you need to get ajob—PH give you yaur choice, and not charge you extra either, of my Advanced Courses on these subjects—(1) Television, (2) Set Servicing and Merchan- dining, (3) Sound Pictures and Public Address Systems, (4) Broad- casting, Commercial and Ship Radio Stations, (5) Aircraft Radio. Your money back if you are not satisfied I will give you an agreement in writing, legal and binding upon this Institute, to refund every penny of your money upon completing my Course if you are not satisfied with my Lessons and Instruction Ser- vice, The resources of the National Radio Institute, Pioneer and World's Largest Home-Study Radio School, stand behind this agreement. Find out what Radio offers you Get my book AT ONCE One copy of my valuable 64-page book, "Rich Rewards in Radio," m free to any resident of the U. S. and Canada over 16 years old. It has started hundreds of men and young men on the road to better Jobs and a bright future. It has shown hundreds of men who were in Mind alley jobs, how to get into easier, more fascinating, better paying work. It tells you where the good Radio jobs are, what they pay, how you can quickly and easily fit yourself to be a Radio Expert. The Coupon will bring you a copy free. Send it at once. Your request does not obligate you in any way. ACT NOW. J. E. SMITH, President Deot. 3-CH. National Radio Institute, Washington, D. C. Experienced Radio Man Praises N. R. I. Course Reton tahing your course, I had Authkewl Ul bach for over seven years, long gulle u bit of servicing, bui I culdvaml that I was in nerd of better talning From NIK first lesson on I separ Poa urelephtand points that had valme onedetine. ‘Mie course has taught neowhml To could nul have learned other- vine ated I woul not take many times be peloe ag hans cotone, for the knowl- upo L havo galned In a period of nine noolhe. I haye made at least $3,500.” C J TEGNER, P8 sg, Sandusky St.. Delaware, O cu Thank You for Mentioning Modern Mechanix and Inventions for Marck When Writing to Advertisers 8bitD ownload.com n Below an d Proof SPECIAL Radio Equipment for Broad Practical Experience Given Without Extra Charge My Courseis notall theory. [’lishowyouhow to usemyspecial Radio equipment for conduct- ing 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 ofthethings you read in our lesson books, This 50-50 method of training makes learning at home easy. interesting, fascinating, intense- ły practical. Yor learn how sets work, why they i 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 looking for a job where you can get experience. With X. R. I. equipment you learn to build and thoroughly understand set testing equipment—you can use N.R.I. equipment in your spare time service work for extra money. i tas J. E. SMITH, President, National Radio Institute, Dept. 3-CH Washington, D. C. Dear Mr. Smith: Please send me your sample lesson "A Bird's Eye View of Radio" and your book, "Rich Rewards in Radio," which points out the opportunities for spare time and full time jobs In Radio and your famous 50-50 methud of training men to become Radio Experts through home study. I understand that this places me under no obligation. AE ae S86 US whe ia ws eae ges oe ACUOVOGSS§ ec. caaereed: Geb. A oaae ee Eaei Leres Hal taebraul etek Bie. oats ,... tate IU pad hw

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Robert Bosfey, a 16-year-old Chicago lad. was inspired bythe plans of Jack Hanna's 24 footer. He got the boat- building bug but his purse could not afford a “Dorothy,” so he built his own version of that good ship in tabloid form. Result: 14 seaworthy feet of boy's size cruiser. A 4 h.p. outboard kicks her along. She ‘takes it" on Lake Michigan. Andy's Shop Mail Box The Depression has hit Andy, who comments upon its vagaries in his characteristic vein. Unusually fine letters and pics make this month's column interesting in spite of the growls of the grease monk. [N THOSE days there were millions. Nobody asked the price of anything, and the giving was as easy as the getting. Things are different now, need a gent named Andy tell you? I first knew about the well known depresh when I found myself involved in tests on the efficiency of Flit, around my seedy bunk in the Robbinsdale Airplane roost. And when things get so tight that a grizmonk like me has got to count the number of potato bugs and roaches killed per spoon of insecticide, you can figger times is tough, bro. There ain't no moh millions, no suh, Me and Archie the Roach are pals. Common suffering and a lack of stuffing for the old gastronomic thermometer tube makes it so. And so from the monthly gripe, let's get into the land of dreams-come-true with the boys who have seen, have built, and are in concord. Let's let these letters and pix take us away from a sea of troubles: Bob Bosley, a reader in Chicago, offers a treat with the fine shot of his little croosin' boat. He Says: 6227 N. Artesian Ave. Chicago, Illinois. Dear Andy old sock: I have been a continuous reader of your superb department ever since I purchased my first copy of your mag; two years ago. The first place I turn to when I get the new edition monthly is, "Andy's Shop Mail Box," 10 and gosh I think it is the nuts. Well, Andy now to get down to the tacks. Inclosed find a couple snapshots of a little trunk cabin cruiser, 14 feet in length with a beam of 4 feet. She is of flat bottom design so she can be beached if the weather blows up too bad. The interior affords sleeping quarters for two, with a little galley and ice box on the port side at the rear of the cabin. She is a wonderful sea boat and I have taken her out when the waves would break solid over the front deck and smash against the 14 plate glass window in the front. She is powered with a four H. P. Muncie outboard motor and makes a cruising speed of six M. P. H. high speed of eight. She is planked with °% inch cedar and has white oak ribs and keel. The decks and cabin top is canvas covered. My buddy and I have made numerous trips in her back and forth Chicago's water front and have not yet had the opportunity to make any long trips as she was just launched this last July. We got the idea to make a boat when the plans for the Dorothy appeared, but, them plans did not quite suit our tastes so here is the results. I am 16 years of age and have had lots of experience with the construction of small cruisers and would like to hear from any other readers who are interested in same. (Continued on page 16) 8bitD ownload.com

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dig Saw Pazzie Kans! Here's a New One .cecceces Now you can get jig-saw puzzles of your favorite motion picture stars AT YOUR NEAREST NEWS STAND! These new MOVIE STAR JIG- SAW PUZZLES are sweeping the country. Everyone is enjoying this fascinating pastime. Get your puzzle today, while the supply lasts, for only se wherever magazines are sold Puzzles are gorgeous oil painting re- productions of movie stars' portraits, OH in 125 intricate pieces. SPECIAL Introductory Offer For a limited time only, you can obtain TWO different puzzles for 25c if you order direct from the manufac- turer. Send a quarter and the puzzles will be mailed immediately, postpaid. Use this coupon: Graphic Arts Corporation °29 South Seventh Street, Minneapolis, Minn, Pin dosed is 25e. Please $e: id ine at oree IWO ot the new MOVIE ST AR JIG-SAW PUZZLES (each puzzle differ ent), pest paid. N arot Neladane on the building of Authentic Models » OF airplanes that fly, shins, trains, complete a railroads and equipment, tiny planes, small ma- > thinery, and other fascinating subjects, all re- quiring only the simplest tools, No theory. Every plan tested and proved. Plenty of pictures, urawings and simplified steps in CLEVELAND MODEL MAKING NEWS & Practical Hobbies „a a long-awaited magazine every, modelmaker wil) INTO TEL thrill aver, Nothing ever like it before. Taking AR lel ete cc madel enthusiasts by storm. Filled with valuable hints, all FULL-SIZE drawings, data and articles. Don'tmis sgetting it, —» full size 33/' scale drawings (Gece Bee Supersporteter FREE and Heath Parasol) with introductory issue, along © h many other items. Hush 25¢ (no stamps) at once for your copy, which can be credited against #1 subscription price (4 issues) should you want to subscribe—don't delay--send your 25 at once. (Foreign, Sv extra.) Address: CLEVELAND MODELMAKING NEWS, c-o Cleveland Model & Supply Co., §866-LC West 57th St., Cleveland, Ohio, U.S.A. a 2o reu STOP TOBACCO? e e Banish the eravinp for tobacco as thousands heve. Make yourself free and happy with Tobacco Redeemer. Notasubstitute, not habit forming. Write for free booklet pire of in- jurious effect of tobaceo and depend- able, easy way to relieve the craving many men have. FREE | Newell Pharmacal Co.| g00K Oept. 867, Clayton, Mo. me nereh umma s njeta ie Big 3ft. Telescope site se Moon, Stars and Qis- tant objects with this powerful &-x instrumeat, Special exe piece for viewing Sun intuded FREE. Makes an ideal Micro- scope. Guaranteed. Big value. Postpaid $1.75. O. D. 15c¢ extra. BENNER Si COMPANY, T-75, TRENTON, N. J. TYPEWRITING and BOOKKEEPING | Courses complete both for $1.00 Typewriting touch system, Bookkeeping single and double entry. BUSINESS INSTITUTE Vandalia, Missouri BUILD YOUR OWN ELECTRIC REFRIGERATOR! Blueprints with complete instructions, $1.50 post- paid, from Blueprint Department, Modern Mechanix and Inventions, 529 S. Seventh Street, Minneapolis, Minn. HowTo Secure A Government Position i | | Why worry about strikes, layoffs, hard times? Train now for a Governinent Jub in the future! Increased salaries, steady work, travel. good pay. Let me help you {aa berome a Railway Postal Clerk. Post Office Clerk, IR paren a City Mail Carrier, Rural Carrier—or help you get BIG into any other Government job you want. F was a i iUe oe es Examiner of Civil Service Commission for p E > years. Have belpeåd thousands. RAN ł l j : | ! t =. am My 32-page book tells ano me Now EREE jobs open—and how I can help you Ret one. Send the e coupon fo for your copy TODA cai rea 1 å me a b ee ee = ped ers ete colors MT cathe ai 1, Civ { ervice Expel PATTERSON SCHOOL, 43-3 Wisner Bidg., Rochester, N. V. Please send me. without ebligation, your free book "How to Secure é ‘Government Position." NAME: aicsecaeeneds BenekGest sade twaeNeenceeeesshias wee sions POOTCSS. 0: 4 Sines Sh 6. «4 SERRES EENE AE EEEN S - oe m+- hask You for Mentioning Modera Mechanix and Intentionsjor March When riting to Advertisers 1] 8bitD ownload.com

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INVENTIO YD Delays are Dangerous in Patent Matters HE FREE BOOK shown here was prepared for inven- S Q tors, 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 oc ONCE. It will tell you exactly how an application for a Patent is made, what information you must furnishyour attorney, and what steps he must take in order to protect your interests. Remember, inventing an article is one thing— securing the exclusive right to manufacture it, use it or sell it is another. Without a U. S. Patent, you cannot expect to reap the profits that your invention may make possible. Send at once for this book. After you get that, you'll know exactly what to dot tect ] o do to protect yourself. T Serve “You Quickly and Secretly Anything you write me or send me is strictly confidential between us. All letters and draw- ings are kept in strong, steel, fire-proof files, which are open only to myself or authorized members of my staff. [have secured patents for inventors located in every state in the Union. My organization is a large and efficient one. My practice is confined entirely to Patents, Trademarks and Copyrights. [havehad years of experience in Patent Matters. When you place your idea in my hands, I am in position to proceed at once to secure protection foryou. 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 for this book. I will mail it, together with the Record of Invention form, the same day I receive your request. Use the coupon on next page to save yourself time and trouble. After that, you will be in position to proceed or not as you choose, to make your application for a patent. CLARENCE A. O’BRIEN Registered Patent Attorney 317-X Adams Building, Washington, D. C. (Practice Confined Exclusively to Patents, Trademarks. @ SMALL IDEAS MAY HAVE LARGE .. | COMMERCIAL POSSIBILITIES Copyrights) Jie. 12 Thank You for Mentioning Modern Mechanix and Inventions for March Ñ hen ¥ ritingto Adi ertisers 8bitD ownload.com

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This Book Tells: How your Patent Applica- tion 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 avery simple idea, ifnew and useful, may prove very valu- able. You may have much to gain and nothing to lose by sending for this book TODAY. Record of Invention Blank Along with my book, I willsend you my Record of Invention form, also FREE. This blank will enable you to make a sketch of your idea in proper form and have it witnessed in such manner that it may be of value to you as evi- dence should the occasion for evidence- arise. In my book, I tell you how tu use this form to protect your interests. My Location in Washington My offices in Washing- ton are convenient to the *atent Office, and I and my assistants can, therefore, @ Ae oe N & = ae n | a ee We REqgistered Patent Atta Yn ey Ol1Clals an Xaminers. WAS HIN ET D NE D. c i Reasonable Fees | CLARENCE A. O'BRIEN, i and Convenient I Registered Patent Attorney, 1 l 317-X Adams Bldg., Washington, D. C. i Terms | l Please send at once your FREE book, "How to Obtain f 1 have served thousands of , a Patent" and your "Record of Invention" form. i inventors in all parts of the q t United States and I am able į NAME......... OEE ica ee ee we 4 praras I to serve you very reasonably ł l and extend liberal terms of 4 ADDRESS....... SE A eee ATS “marmieieersseed 4 payment. So don't waste | i valuable time. l saras... ore ss. .s.srasa See ae vent ee ee eee eee er ee ete i | {Be sure to write or print name clearly.) --m I- Thank You for Mentioning Modern Mechanixand Inventions for March When W riting to Advertisers 13

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“How to Obtain a PATE This REE BOOK Tells You How to Protect Your Invention Little Ideas May Have Big Commercial Possibilities De lays 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 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 for 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 adyantage of highly skilled and experienced service, . e 14 Thank You for Mentioning Modern Mechanix and Inventions for March When Writing to Advertisers gae 8bitD ownload.com

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VALUABLE RECORD FRE OF INVENTION BLANK Mail the coupon today, and in addition to the free 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- sion require it. There is no charge or obligation for this service, E l surai you ẹ harch end description of ay invention whieh | ad e am? ak thal you advice wee whether of Sot in your opion iha mma may f bn patoi, $ wew. z Yours wary dy. MG Go Whom it May Concern: Be it Known tha a has this of n- G2. disclosed tp —— J the invention illusrated and described on this sheet and BERCE, — fully understand the construction.thercof, ow aw ew ww wae ae E S 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 MAIL SeA E coupon. Our service is com- THIS plete, our fees reasonable NOW, and our terms convenient. Don't waste priceless time: Established 1898 REGISTERED PATENT ATTORNEYS MAIN OFFICE: 605 CC Victor Building, Washington, D. C. l BRANCH OFFICES: 1640 CC Conway Building, Chicago; * 233 CC Broadway, New York; 828 CC Fidelity Philadelphia i Trust Building, Philadelphia; 514 CC Empire Building, z Pittsburgh; 1010 CC Hobart Building. San Francisco. | a Please send me your free book, "How to Obtain a Patent," and your “Record of j Invention Blank." This request does not obligate me. 3 { E e E EA E eee | Street and iO waccncececacnscceneasucndcawateneivedaiweassbeecusensuceesleceutaessbasiine acta te Eea ea | 4 +. 1 dwa auii aan ii meze- Thank You for Mentioning Modern Mechanix and Inventions for March When Writing to Advertisers 15 -1J — Wp e I a f a ; 8bitD ownload.com

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NOW TAKE WOOD OUT OF A CAN QUICKER, EASIER WAY TO MEND BREAKS, HIDE NICKS, SEAL CRACKS, MAKE REPAIRS Here's an entirely new kind of wood that does do and does it better. And it has a thousand additional uses. It handles like putty — and quickly hardens in- to wood — waterproof, weatherproof wood you can carve, cut, paint, drive nails and screws into. Split chair backs, loose chair legs, ugly nicks in furniture, brok- en mouldings, loose knife handles, cracked | porcelain, holes or cracks in the floor or shelving ... Get a can or tube of PLASTIC WOOD (comes in 9 colors) from any paint, hardware or department store. Follow the sim- ple directions and you'll do an expert job of repairing in a jiffy. PLASTICWOOD everything glue can is Mends Breaks Handles Like Putty—Hardens Into Wood | ~~ Op ANDY’S SHOP MAIL BOX (Continued from page 10) Hoping, on bended knees, to see her picture in publication, I am, Very sincerely, Robert Bosley. P. S. It took me and the boy friend about five months of off and on work to complete the project. Tanks a lot, Bobbo. No need for you to get on your knees. Any pix with the romance that has, plus the sharp photography, will never go begging around, here. i g Strange birds show up here at the field onct in a while. The other day I spotted a bright eyed, bashful chap about 30, dressed in hitch hiker's garb with leather jacket, overalls, and everything, shyly looking over the new Ford ship in the hangar. An officious local kiwi was all for doing the bum’s rush act. I stayed him, asking the stranger what he wanted. "Thought I might buy a ship,” he said. You know the old gag. The kiwi said as much. “What’'ll you use for money? Pants buttons?" Kiwi pipes out. The ship wasn't sold, but it turned out the gent was a cattle rancher from Montana, had come to town with some cattle, and had a $4,000 stake on him in bills when we were doubtfully eyeing him. We are now the best of friends. (Continued on page 18) 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 an army pursuit job — and many others. PRICE 50 CENTS If your news dealer cannot supply you, send 50 cents Co Fawcett Publications, Inc., 529 S, Seventh St., Minneapolis, Minn., and a copy of the 1933 Flying Manual will be mailed to you at once. Roe 16 Thank You for Mentioning Modern Mechanix and inventions for March W hen W riting to Advertisers 8bitD ownload.com

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NOTE: No other Physi- cal Instruc- tor in the World has ever DARED make such an offer .... thats all I need to PROVE can make You. a NEW EON Holder of the title: "Ihe World's Most Perfectly Developed Man" N ['e'eweek | That's all the time I need, in 7 days I'll PROVE that I min make “you over into a new taa ad vutality and powerr. Il! sh" tor you exactly what T did for ool JT was once a 97-pound weakling. Powis sakty, only half alive. I had a Malte thinihe-pamby body. How g changed myself from this “he- len av, tape’ physique into the man who oa Up LETT NE all comers—the title of “MWoatd e Most Perfectly Developed Man" is wn atear þing story. Tt is told in my book. laal ve fate Heatth and Strength,” which T woll se ted) yang absolutely free if you fill in and tool thee eupon below, It's Easy MY WAY Vy forse mean nothing! That is why I offer yeu more thin fremrcee That is why I offer you a 7 days' trial of vo hanow method, Dynamic-Tension. That lets you see for voua lt tbat I back up every promise I make. That PROVES bevond a flicker of a doubt that I can and eH noo yah too, into a vital, powerful NEW MAN. Ihoueamds of fellows all over the world have used my ine tian] anl now you can, too. Like them, you can put on hour laser of muscle where you need them most. tone up mot owlott system, banish constipation, poor digestion, bad beath, pimples and other ailments that rob you of the good thongs tel good times of life, and get the "drive" that ll tale ven to the top of the ladder. I’ve Got NO USE for Apparatus l haven't any use for tricky apparatus and machines that ma rooln your heart and other vital organs. There's nothing unnatura m owiliAclal about this method of mine. And stent afons you or doctor you. Dynamic-Tension booth To teed It's the natural, tested method fot devetepiig read men inside and out. It dis- bital oquildedd peungs of powerful muscles over vea boqs. peti rit of ailments and surplus fat, eed phe» vou the vitality, strength and pep that win yoy the admiration of every woman and FREE BOOK P” CHARLES ATLAS. + r v aroen a, stamp today. ot Dept. 6-3 my new booh, “Everlasting |#* 133 East 23rd Street, Health and Strength." It tha oe pa't or any num, h f tual pho- 1 tos how, T have “Jeveloped New York City m ils to my own per- ig- i Send for YOUR Copy ean P balance > propor. I want proof that Dynamic-Tension tions. Where Shall l send will make a New Man of me-—give Ynd address down onthe | me a healthy, husky body and big per: Ru meray ome muscle development. Send free book. “Everlasting Health and Strength." of My FREE BOOK Phat be held hack hy a below-par bodv! Paw vere ane easily and quickly make this meow onan oof yourself! Do what my thou- rasule of other pupils did—send for a free E rep. of tus sllastratel book, "Everlasting Health and Strength." a Peso how 1 built myself up from a weak. no-muscle., always- g vard Cunt" In winner of the title, "The World’s Most Perfectly B E a a Ttevetipedd Man” Gamble a stamp to mail my coupon—to learn bew YHT can win the biggest prize in life—a handsome, Healthy. looky body. Address CHARLES ATLAS, Dept. 6-3, i tiiedees OTA T Be tawcseeas tra boo sae! St, New York City. © 1932 C. A. Ltd. 0 E mere- Thank You for Mentioning Modern Mechanix and Inventions for March When Writing Co Advertisers 17 8bitD ownload.com

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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. S 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, 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 h e foundation. In Teaching: Practically all states now require teachers of any grade to have at least a High Sehool education. In College: All colleges require complete High School training for entrance, and base their instruction on High School work. In Social Life: A High School education assures correct speech and gives a general knowledge of many subjects. 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 a 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 ıt! 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. Let us show you how to get on the road to success. It will cost you nothing but a stamp. Write today. American School Dept. H-333, Drexel Ave. at 58th St., Chicago, IH, THE UNIVERSITY OF THE HOME OMAOC ANDY’S SHOP MAIL BOX (Continued from page 16) John Schncck builds a little motor for pushing bikes and small cars around. Neat little puffer, eh what? I get a bang out of the little motor made by John Schneck, 8 West Detroit St., Calumet City, Illinois. Here's his letter. Calumet City, Illinois. Dear Sir: Being a reader of your mechanical magazine would like to show you a one-cylinder two cycle 2" bore by 1%” stroke motor. Can be attached to a bicycle or used for other pur- poses. I want to sell the (unfinished) castings and blue prints. Enclosed find pictures of a finished motor. Thanking you for reply, I am Yours truly, John P. Schneck. The pic is shown. Don't bother my greying temples with the why, where, and whens. Con- tact Johnny directly. Illinois seems to be a hotbed of activity. Here's another: Chicago, Illinois. Howdy Andy: I'm no author or any of that stuff, but I'm sending you a few lines and a snapshot of my glider that I built with the aid of my brother, Eddie. We started from models, on to gliders, and soon (%) expect on to power jobs. Just now we are making a kayak to keep busy. "Happy landings," Victor Brazauskas. Here’s a swell glider built by Victor Brazaukas and his brother, who live in Cheecago, Illinoise. (Continued on page 23) MR e amema ner + + 18 Thank You for Mentioning Modern Mechanix and Inventions for March When Writing to Advertisers 8bitD ownload.com

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-CHAMPTONS Hold National and World's Records for coming A. A. U. events IOL MILLER fua Maller ssa "natural". He halds masty records on the Olym- pa /e//, He bas "jerked" 290 frveenedr cetad “cleaned” over z00! DICK KACHTELL For 5 years National lightweight Thefirst American to emulate p Champion! Theonlyman in Am- his teacher, George F. Jowett, ə erica to do more than his body They are all pupils of George F. Jowett - and are now being trained by him > BILL GOOD First American regardless of body weight to exceed heavyweight to- tals on the 3 Olympeclifts. 311 ths. with two hand "clean andjerk"! ART LEVAN and lift double bs body weight weight in the one hand watch! in the two hand "jerk"! t wish you could see these four boys working out. It would give you a picat thrill tọ see them ,take a 250 Ib, Bar Bell and "jerk" it overhead with apparent case! Maybe you think they can't TAKE IT! jtrmrakeS inc mighty proud to know that I have trained these 4 famous champions and oerte i no reason in the world why yew can’t"stack up" with the best ofthem. Iam pee oler till to think that there are more than 10,000 mea who have taken my concise ur Phy ical Training in the last four years. If you could only read the enthus- sata fe ters they write me every day about the wonderful improvement they are making athe 7 physical development—you wouldn't wait another minute to enroll! "saute am T that I can do all that 1 say, that I make this unqualified guarantee .. the ruarantee that ne Physical Instructor has ever DARED to make... »» | Guarantee to Add at Least... . INCHES TO Cù INCHES TO YOUR CHEST 4 VOUR BICEPS ae af won't cosf you one cenf! Signed: GEORGE F. JOWETT bear MM tallcourse, ifit does notdo alll say—andI will lec you be the judge—then it wont fost you ane penny, even the postage you have spent will be refunded to you. Tlesewe kkipny fell WS that are discouraged are the men I want to work with. rit Tissclsd oo ateeseg ana’ body for them and do it quickly. And I don't mean cream-puff srosene den eother—— eon will pet real, genuine muscles that will make your men friends taped yene att wo aen admire you! nett, MM falls aes fy costsafew certs a day, [ want you to try one of my test coursesfirst.. send fort “Moul ing a Mighty Arm" a Complete Course for only 25c te will In a evel tion to you. You can't make a mistake. The guaranty of the etseeopeaa aeenedd mab on the world stands behind this course. I give you all the secrets Jf ctcepth uateat cl and explained as you like them. You, too, can get anunbreak- able prip l stee D ar d a Herculean arm. MAIL YOUR ORDER NOW and you will receive a Free Copy of "NERVES OF STEEL, MUSCLES LIKE IRON." It describes Geo. F. Jowett's rise from a puny boy to be one of the world's strong- est athletes with a chest measurement of 49 inches and an 18 inch bicep! It ex- plains why he is called "Champion of Champions” — and there is a "thrill" in every page. It is a priceless book to the strength fan and muscle builder. Fuil of pictures of marvelous bodied men who tell you de- cisively how you can build symmetry and strength the equal of their own. Reach out .., Grasp This Special Offer. BOOK WITH PHOTOS OF FAMOUS STRONG MEN JOWETT INSTITUTE OF PHYSICAL CULTURE Dept. 37Qb 422 Popiar St. Scranton, Pa. George F. Jowett: Jour proposl- tionlooks good tome, Sénd. by return mail, prepaid, the courses checked below for which I am enclos- ing. O Moulding a Mighty Arm, 25¢ O Moulding a Mighty Back, 25c D Moulding a Mighty Grip, 25t O Moulding a Mighty Chest. 25c O Moulding Mighty Legs. 25c O Strong Man Stunt Made Easy 25e i} AH 6 Books for $1.00, Inchide FREE Boock, ‘*Nerveęs of Steel, Muscles Like iron.”' Name Poy any oe ol tese courses listed in the coupon at 25c. Or, try all six of them daai 1da Oo oat Address al +m ae HRD ee Thank Fau for Mentioning Modern Mechanix and tnventions for March When Writing to Advertisers 19 8bitD ownload.com

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See Ce ee ee AVIATION PROPELLERS and blueprints. New- est type, highest performance, lowest price, Free catalogue. Dumas Aircraft Company, 1330 East Pike, Dallas, Tex. EVERYBODY'S Aviation Guide, by Victor W. Page. This book has been prepared to meet the demand for a sin- plied book on Aviation that would be suitable for young people, for beginners, and all other persons who desire general information without having to go through a mass of technical detail to rick out items of genera] interest. It outlines in full all types of land and sea uying machines. their control systems and the methods of flying. Price, $2.00. Modern Mechanix and Inventions, 529 =o. 7th St.. Minneapolis. Minn. BE PREPARED in aviation for the next boom. Write for new home study nution offer. Major Robert Rockwell. Davton, Ohio. . BUILD Corben Baby Ace. complete kits including factory welded fuselage, tail unit. under carriage. Folder, dime. Cor- ben ‘sportplane Co., Madison. Wis. USED Airplanes, $50 and up. Catalog a Federal Equipment Co., Deerpark, 110. METAL Tipped Propellers; Fords, $9.98; Henderson, $8.98: Harlev, un- tipped. $4.50; New Improved Heath ships, $298.00; Bristol Cherub Tupe 40 H.P. motors, $75,00. Photos, informa- tuon including leather bound Flying Manual, 25c. Hibbs, Ft. Worth, Texas. AGENTS MAKE your own products. Employ Agents yourself. Toilet articles, soaps. €xtracts. We turnish everything. Waln- alle hock Free. National Scientific Lah- oratories. 1964 Broad. Richmond. Va, BIG MONEY and Fast Sales. Every Cwner buys Gold Initials for his auto. ou charge $1.50; make $1.45. Ten Orders daily easy. Write for particulars ind free sample. American Monogram fomnany. Vept. 11, Kast Orange, N, J. AGENTS WANTED to advertise our goods and distribute introductory pack- ages to consumers. Must be satisfied with 90c an hour at start. Write for full particulars. Albert Mills. Route Mgr.. 3702 Monmouth, Cincinnati. O. METALLIC Liquid. repairs metal, wood. everything. without heat. Sells 25¢c. Costs 6c. Sample free. Bestco. 4323-W. Irving Park, Chicago. FREE Bocklet descrihes 87 nlans for making $20-$100 weekly in home or «fice business of your own. Elite Co., 214-G, Grand St., N.Y. AGENTS WANTED MAKE your own products. Employ Agents yourself. Toilet articles, soaps, extracts. We furnish everything. Valu- able book Free. National Scientific Lab- “ratories, 1964 Broad, Richmond. Va. BIG MONEY selling shirts, ties, under- wear, dresses, hosiery, raincoats, cover- alls. pants, uniforms, playsuits. Big outfit Free! Nimrod Co., Dept. 132, 4922-28 Lincoln Ave., Chicago. te) 20 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. Closing date 20th of third month preceding date of issue. Address Classified Mgr., Modern Mechanix and Inventions, 35 East Wacker Drive, Chicago, rE. AGENTS coining money, applying auto- | mobile initials. They go hke hot cakes. No experience. Free sample. *Ralco.” 1084 Washington, Boston, Mass. AGENTS’ Gold Sign Letters for store windows. 5/0 ¢ profit. Free sample. Metallic Letter Co., 426 N. Clark, Chicago. YOU ARE wanted to resilver mirrors at home. Profitable business plating auto arts, tableware, etc. Write Sprinkle, Plater, 850 Marion, Indiana. AIRCRAFT LUMBER SPRUCE— Finished tọ size for air. planes. gliders, iceboats. Highest qual- ity. Lewest prices. Mail sizes for quo- tation. Pike-Dial Lumber Co., 2261 Loomis, Chicago. BUSINESS OPPORTUNITIES DOLLARS in your mail, operating puatantced imailway business at home. etails on request, Meailway System, 1418 Peden, Houston, Texas. MAKE money at home. Exnerienre. capital unnecessary. Illustrated booklet free. Dept. 73, Egard, 1 East 42nd, New York. EARN L'P TO $5,900.00 YEARLY! Raising Bullfrogs! (Your backyard.) We start you with breeders, furnish in- structions and market facilities. Ameri- can Bullfrog Industries. 100-MM, Fre- mont, O. f OPERATE Chain of vending and amusement machines. Be independent for life. Start small, grow big. . e 1826 East Main St.. Roches- ter, N. 700 MONEY Making Secrets will help vou start a business of vour own. Write Illinois Universal, 800-M, N. Centra] Ave, Chicago. MAKE yvur own products. Employ Agents yourself. Toilet articles, soaps, extracts. We furnish everything. Valu- able bouk Free. National Scientific Lab- oratories. 1964 Broad, Richmond. Va. MAKE Artificial Marble. colorful, glos- sy tiles, no polishing, rather uncanny. Novelties. tabletops, hookends, floors. whetstones. Hard. inexpensive, fire- proof, enamels wood. Secret cement Amazing samples 3c. John II. 945 Grande Vista Drive, Los Angeles, Calif. TATTOOING outfits supplies, illustrat- ed list free. Waters M-965, Putnam, Detroit. AMATEUR cartoonists, earn $25.00 week, spare time, copying cartoons for ee Three-M Syndicate, Argyle, Vis, START business at home. Make $20- $100 weekly without canvassing, experi- ence, capital. Booklet free, describing 80 plans. Dept. 72, Egard, 1 E. 42nd, New York. COMPLETE Chemical Service. Analy- sis, Formulas, Consultations. State Licensed Chemist. Twenty-five years' experience. Write for literature. W. L Cummings, Ph.D.. 428 Gordon Avenue, Syracuse. N. Y. 8bitD ownload.com BUSINESS OPPORTUNITIES SUCCEED with Your Own Products. Make—Sell them yourself, Formulas, frocesses, Jrade- secrets. Analvtircal Service. Catalog free. A. Thaxly Con. pany, Washington, D. C. ARTIFICIAL marble sanitary flooring. instructions covering wood or cement ooring 14 inch thick, fireproof, all col- ors, low cost. Ornamental casting, con- crete tiaster, papier-mache decorations. garden furniture, statuary, flexible molds, particulars and illustrations free. SELL by mail: books, novelties, bar- gains! Large profits. Particulars free. . Elice, 52S-S Dearborn, Chicago. BLUEPRINTS BUILD your own bench shaper for home shop or commercial machine shop. We supply complete blueprints and rough castings. end for free descrip- tion and price list of parts. P. W. Cer- nelius, 2457 E. Washington St., Indian- apolis, ind. BOATS BUILD your own boat using Rrunks (Originators of Knock-down System) ready-cut materials and save two-thirds regular builders’ costs, have more suc- cessful seaworthy craft. Frames fully assembled. Cruisers, Runabouts, Launch- es, Outboard Motor, Row and Sail, in- cluding Rudder's Snipe Class Sailer. Also complete assortment Propellers. Shafting and Accessories. Send 10c for catalog,” Brooks Boat Co., Inc., Box MM-39, Saginaw West Side, Mich. BOOKS TWENTY clever parlor tricks 2c, Map of the Moon 20c. Heat Treating Steel for Amateurs 50c. Arthur Ihsen, 3¢&4 Drexel, Pittsburgh, Pa. — — BOOK PUBLISHER ~ ABSOLUTELY new vital health se- crets disclosed. Amazing results guaran- teed! Write! Vitalis System, Y-i214 East Colorado, Pasadena, Calif. ____ GAMERA and PHOTO SUPPLIES MAKE money in photography. Learn Ula at home. Spare or full time. ew plan. Nothing like it, Experience unnecessary. American Schon} of Photography, Dept. 2049, 3601 Michi- gan Avenue, Chicago. __CORRESPONDENCE SCH. COURSES L SED Correspondence School Courses: bought, sold, exchanged. Specify course wanted. R. E. Kelley, Sturgis, Mich, DETECTIVES DETECTIVES earn big money. Excel- lent opportunity. Experience unneces- sary. Particulars free. Write, George Waener, 2640-V Broadway, N. Y. CHEMISTRY HENLEY'S 20th Century Book of For. mulas, $4.00. 10.000 selected household. workshop and scientific formulas, trade secrets, chemical recipes, processes and money saving ideas. One of the most valuable reference books for home, fac- tory, office and workshop. Modern Me- chanix and Inventions, 529 So. Seventh St., Minneapolis, Minn. igs- Thank You for Mentioning Modern Mechanix ang Inventions far March When Writing to Advertisers

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Na E e T G E ĠER rot INVENTORS yenta selling your un- Vasctral plan, 50c. In- Veeney, tonennati. pucrebe T { cde aete l ul A bs ras diocesa]

SA YMG a sound, practical inven- ooe fat rah, patented or unpatented? I eo, wails < hartered Institute, 570 Peaga Phalbdinp, Washington, D. C. Le\INE LORS Sell your inventions bebec o alennng., Free particulars. Moa M | «ireene, 942 Barrister Baal, Washington, D.C. i al FORMULAS Idt MILAS all kinds. Guaranteed. ( utaler fiee. 'KRemico’, B-16, Park- taliet tit MORMUPAS, business plans. Litera- tare bare t) Belfort, 4042 N. Keeler, t tra gear WEL WANTED—MALE INSTRUCTION W IM TIVES, Work home or travel. Poa pertienee unnecessary. Write, Amert- san Detective System", 2640-T Broad- vay, N Y.

-INVENTIONS NVENTIONS Commercialized. Pat- entol ot unpatented, Write Adam toha Mig. Co., 582 Enright, St. Paus, Missouri. Zo INVENEFIONS commercialized, at- eoterl uepuatented. Contact manufac- Lilit tR Precilla Company, Call Build- inv. MI Francisco, California. INVENTORS Manual, How to Make Patent Vay. This is a book designed d o ruule fo inventors in perfecting tliin owivettioms, taking out their pat- eot- and disposing of them. It is not arany sense ga Patent Solicitor's circular

=. wa t Patent Broker’s advertisement. No advertisements of any description nus oa an the work. It is a book con- Foci a quarter of a century's expe- ta M,e ota suceceessfulinventor, together with notes based upon the experience of many other inventors. Third revised vel eubateed edition, 138 pages. Tlus- Goted, pince $1.50, Mechanical Appli- amies, Mr, hanical Movements and Nov- ‘His of Construction, Gardner D. His- '.... M I . $4.00. It may be said that the whole beld of mechanics is covered hy his voltume and every inventor, +u MI attorney, machinist, engineer and Ho o oothets engaged in the mechanical ata aa tiferested in the design of any taan of machinery should possess this valuable work, “Sixth revised and en- Popat edition, Ower 1,000 special en- rravimps Modern Mechanix and Inven- trons, W19 So, Seventh St., Minneapolis, Atini

JEWELRY ECN Wat hmaking Free. Send 2Sc. Peotie Matel Lesson. Stewarts, Carle- tom Wde. St Louis, Mo. MAGIC MAGIC Catalogne. Wonderful knock- woad tack Dine, Singer, 444, Han- eh ERETTE TIN OOMAI Ticks, 10 games, and all apt, dalops Jie. Gilmagico, Morgan ued t þe ao

MISCELLANEOUS EFFECTIVE sales letters $3.00; ads $1.00; 12, $10.00. “Superad” Service, Box 250, Ithaca, N. Y, 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-3, Cincinnati, Ohio. MODELMAKERS build 4%” steam locomotive without Fleenor, Stafford, New York. MODEL ENGINE “REAL” Motor, gasoline, for model airplanes, boats, 347x347, w h.p., weight 1 łb., 3200 r.p.m. Catalog "Real Boats," motors, fittings, 20c coin. P. Loutrel, 96 McDonough St., Brooklyn, New York. MOTORCYCLES 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, New York.

scale castings.

NOVELTIES PHANTOM CARDS. card trick in the world. leaves nothing. Always ready, fools everyone. 25c coin. Postpaid. Novelty Supply Depot, Drawer 775, Soudan, Minn. The greatest Two from 5 PATENTS GET your own patents; legal blanks, complete instructions $1. Cudding Sons, Campbell, Calif. PATENTS-—Small Idea 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. ©’Brien, 28-K, Adams Building, Washington, D. C, See page 12, — oo INVENTIONS Commercialized. Pat- ented or unpatented. Write, Adam Fisher Mfg. Co., 582 Enright, St. Louis. Missouri. PATENT ATTORNEYS INVENT something!

New discoveries have cured previous depressions. Un- patented ideas can be sold. I tell you how and help you make the sale. Free 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

may have PHOTO FINISHING YOUR Favorite kodak pictures en- larged, size 5x7, lOc. Three for quar- ter, coin. Send best negatives (ñlm)} today. Address Darmer Photo Lab., R221 Securities Bldg., Des Moines, Ia. PLAYS—ENTERTAINMENTS MINSTREL Show—Complete for $1. Particulars free. Rialto Publishers, 1539 Broadway, New York. POCKET RADIOS GUARANTEED "Pocket Radio," $2.00. Catalogue, lOc. Neil Tasker, Shamokin, Pennsylvania. — PROPELLERS PROPELLERS—Designed for boats,

sleds and planes. One Waco Glider. Owner ready for plane. The J. B. S. Propeller, Lititz, Pa. RADIO SHORT wave construction kits, sets, supplies. Wholesale catalog lOc. | Fed- eral Radio, 4222 Clifford Road, Cincin- nati, Ohio. RADIOS FOR SALE NEW 300-mile “Pocket” Radio, $3.85. Complete with special loud receiver. No tubes or batteries required. Order direct. Spencer Laboraturies, Dept. 10, Akron, Ohio. eee RAZOR ACCESSORIES AMAZING increase in shaving life of any type safety or straight razor with new "blade aligning invention. Fifty cents postpaid. William Seward, S531 169th St., Jamaica, L. I. ROOTS AND HERBS JUST OUT! World’s greatest "Herb Almanac." Beautifully illustrated in natural colors. Contains over 500 old- fashioned herb medicine recipes and In- dian secrets for home use. lOc (coin) postpaid. Worth dollars! Bontanics, 145 W. 112th St., Chicago. __ SALESMEN WANTED WANTED: Man in each county who will be satisfied with $25 to $35 a week earnings in the start doing service work and demonstrating new Automatic Fire Alarm in Schools, Homes, Hotels, Thea- tres, Public Buildings, etc. Write quick for county appointment. Fire-Cry Com- pany, Dept. 615, Dayton, Ohio. SHORT STORIES SHORT Stories Revised. Typewritten, Marketed. Details Free. Hursh Service, Box K-1013, Harrisburg. Pa.

SONGWRITERS SONGWRITERS! Poems, melodies. Astounding proposition. Hibbeler, D195X, 2104 Keystone, Chicago. SONGS. POEMS, WRITERS __ SONG writers wanted now. 50-50 plan. Indiana Song Bureau, Salem, Indiana. STAMPS STAMPS! 100 diff. 2c; 500 diff. 35¢.; 1,000 diff. 90c. Tatham Stampco, D9, West Springfield, Massachusetts. TELEVISION i A B C of Television or Seeing by Radio contains 210 profusely illustrated pages. The first portion throws the soft light ae inventors. Delays are dangerous in | of understanding on the subject of the 11 AUN MAGIC. Large illustrated | patent matters—act at once and protect | different television systems in use today. eet of troks vow can do. 25c. | your idea. Reasonable fees. Deferred | In so doing, it clearly, concisely and in (tet. ote W rnd St.. N payments. Write us today. Victor T. | the simplest of terms, outlines the real HA HELLP WANTED Evans & Co., 647 CC Victor Bldg.,| fundamentals of each system. The prob- 2: Washington, D. C. lems of scanning, amplification of light Perry E PORS eealy available. $200 PERSONAL modulated signals, photo-electric and at aban Pant, trap. patrol. Get - : selenium cells, neon lamps and syn- ehh erate alg jean Rayson Service, | BORN Clairvoyant will reveal your} chronizing appurtenances are covered in I: Hii Walienda S100. ea a aa wA detail. The book appeals to those who D LUN orecasting on stocks. Mabel) wish to huild television receivers and AACN . Arlitt, Lock Box 278, Wilmington, | transmitters either for entertainment ‘Pat d Pp ve El RING, iodels, dies, Mass. or research purposes. 210 pages, price tosspany hea owerth, moulds for cast- | ESCAPE from your lonely existence! | $3.00, Modern Mechanix and Inven- jew vleuoeene OC tteoular tree. Baums { Valuable information free. Write today. | tions, 529 South Seventh Street, Min- Aber dpe alts Batean City, Ma. | Box 128-MM, Tiffin, Ohio. neapolis. Minn. -p -— g3.» trash tou por Mentioning Modern Mechanix and Inventions for March When Writing to Advertisers əl 8bitD ownload.com

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GANNET—Ford-Powered A deservediy popular boat plan. A 24-foot cruiser, powered with Model r Ford motor, driving her at around 15 m.p.h. Uses V-bot- tem hull, ewsy for amateur builder. Straight sides easy to plank. Bunks for two; plenty of room for provisions an $2.00 duffle. Price of prints . a. ae è DOROTHY— A Cruiser Primarily a power boat, designed for cruising economy, not speed. Good fer 9 miles an hour with a 10 hp, marine meter. Ford can be used if desired. Dorothy has a sail if the motor quits. She's 24-foot, plenty of cabin room for two or more; a $2 50 real deep-water performer. Prims EEEE ENE e 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 Si 00 of speed. Prints is. sasear seers pira eerrveee + ultimate in small single- BUDDY—18 Ft. Single-hande two with eomfort on jong Designed by Sam Rabl, embodying the also provision for radio handed sailing cruisers. Accommodates cruises. Has 5 h.p. inboard motor, installation. Blueprint; are amazingly complete Saf TO and detailed. Price of prints, postpaid .isveuveuveeos . PUNKIN’ SEED Cleans up in i #7.00 A small outboard racer, extremely simple to build. Blueprints give al) beeper ens eeoreas B, C, and D classes everywhere. Strictly a speedboat — easily portable. Prints ,.......04.: CANVAS CANOE The n: type for the amateur n dimensions for a job you'll be proud of. Price of prints, postpaid ... 0... ciecsaecceeeeee Siar 1.00 RACING ICE YACHT An ieeboat of 375 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 0 utmost in speeđ and stability. Price of prints........ 00 MISCELLANEOUS SHORT WAVE RADIO CONVERTER With this, converter you can hear short-wave programs from amazing distances on your own radio set. Inexpensive to build — blueprints Rive full instructions as well as 8 diagrams. Price of prints 1,00 LONG HARLEQUIN MOTOR The ideal light plane power plant, using Harley Davidsen 74 cylinders and other stock parts. Develops 30 h-p. on 90 Ibs, Picking up an old Harley motor cheaply, this dependable power plant can be built for under $50. Price of d= full-size prints ssasrrsssessares, E EE TTA r9. sederaat > seep er ere ee ee eee are eeeecee Get Your FREE COPY of this Brand New Blueprint Book

Just off the press—this new, lavishly illustrated booklet, showing photographs 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. A 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 bed? and house- held equipment, with a collapsible canvas roof and sides which fold up when net in use. Four or mure can sleep in her. g Price of prints 1.00 Bìiueprints, with full instructions for butiding, on an amazingly enappy and inexpensive job. Uses a motoreycle engine for power. chain drive—capable of 63 miles an hour, and looks like a custom built factory job at one-tenth the price! g Price of complete prints i ea ew 2.50 LIGHT AIRPLANES PIETENPOL AIR CAMPER The country's most popular home-built plane. Carries two pas- sengers, powered with Mfodel A Ferd mutor, High wing monoplane. Cost of construction, including motor, well under $590. Blue- prints show both weod and steel tube fuselages, and give muter tonverston details. Hundreds: of these prints have $ been sold with complete satisfaction. Price of prints.... 790 PIETENPOL SKY SCOUT A mate to the Air Camper, Single place, powered with Model T Ford moter. Cruising speed, around 75 m.p.h. The most satis- factory light plane with this type of motor. S Price of blueprints 4.00 GERE SPORT BIPLANE The leading light ship of biplane design. sign practires: fuselage is welded steel. Suitable for Model A Ford power plant, or any other metor up to @f horsepower. Exclu- sive of motor, costs around #360 for materials, A real man-<ize ship that you can be proud to rall your ewn. $5.00 eee eee eee eee ee Ce eas eer terre eee eee eee Cr ee Incorporates latest ce- Price of blueprints ....e.ssssarerrprnrinoennansrssn. « Modern Mechanix and Inventions, Mar MM = I 529 S. Seventh Street, Minneapolis, Minn. : a E Gentlemen: Please send me my copy nf the big new Blueprint Book by | j return mail. Thisomes to mevithout thælightest obligation. I enclose $...... in payment for blueprints of..,........ (Note: This form ran. bo used if you wish any of the prints AZ listed above witheut waiting for the descriptive booklet.) B F I l Name beerse ira eE eia e e a e a ee obni E i | Address jaded ye 855-e enw eos Se aimed eee Oty wale CY Hs ween Oates j City A ade pai ec Re DRS ee 6 eps. 22 Thank You for Mentioning Modern Mechanix and Inventions jor March When W riting to Advertisers 8bitD ownload.com —

Page 23

ANDY’S SHOP MAIL BOX!

Oalstoning— He didn't believe it — at first. (Continued from page 18) | One Of the most intelligently engineered snow- . nledn I ever see was built by Manville Hutte- ede Of International Falls, Minn. There's some netine and no little airplane feel about the job: beo han built. | 406 3rd Street, International Falls, Minn. | Dear Andy: | Inclosed you will find some pictures of a snowshed built by me last fall. This shed will | make 35 miles an hour over snow. It is pow- ered by a Henderson motor, and the propeller diam. is 54" x 42" pitch, which is made from your November issue M.M. and the body is made from the plans of Penguin Training Plane, I have been a reader of your magazine since 1927, and boy, it is a good magazine! Keep it up. Yours truly, Manville Huttemeier. “Yes, I believe it" An Open Letter From A Happy Man

DUT this on your ‘believe it or not’ list. My promotion 4 and raise came from reading and believing this state- ment: ‘Every hand tool needs o#/stening often." "I had all the boys in the shop oilstone their tools for a few minutes one morning as an experiment Ye gods! What a bunch of smiles! Cheerful workers, better work, faster work! Three months of this, and they gave me the big room with twice as many machines and men. I read about o#lstening in the Norton-Pike book —a brainful of the smartest dope on sharpening ever spilled on paper by some sharp who knows sharpness forward and backward ” Iiternational Falls, Minn., sees another snowsled. This one wawhbuilt by Manville Huttemeier on a Penguin fuselage. I want to pay a tribute to a really fine chap who I consider a Titan in his line. He works in a httle Florida coast town, supporting his family al what he can turn his hand to honestly in these parlous times. His work calls for a lot of difficult chent handling, yet he never gave a client a bum nleor even if the cl. wanted something that wasn't pood for him. Because he is honest in his work, and labors diligently over design details that are ‘antid, and fashions plans of little and big sea- tomp yachts that are right, he has earned the rerpect of all naval architects who know Immor- tality in a boat when they see it. Toit tnan is John G, Hanna, who lives at Dunedin, tia., and who has improved boating for thousands by | NORTON. : boing a militant and kindly mentor in the sea's; Use Spoil of Kings. Like the man with the better what Experts PIKE ‘Products mousetrap, the world should beat a path to his use ak door. A Mineral Museum Werth Seeing If you saw all the sharpening stones, grinders, wheels, etc. in that fine hardware store downtown, all made by Norton- Pike, you would feel greedy for a private collec- tion of your own. Take a look. Dealers like to show them and talk shop-talk. ie i ii a ea SA D SSR iA, P Spe oe SAS ors Ef Established 1823

* * * BEHR- MANNING CORP., Distributors for the U. S. A. | I picked Hanna's famous double ender eT Dept P, Troy, N. Y. for a forthcoming how-to-build. She's named Tahiti. She is a real ship, suitable for cruising in | the South Seas. You can go there in her, andi thats why she's named Tahiti. Keep a weather I'm boning for the Norton-Pike book,““How to Sharp- en," I'm sharp enough to ask for it, since it's FREE eye peeled, mates. She's coming soon in juicy NaMe.nonerassnsorrocceoicnmimtiissntnnnttnnnuraneenentnmtnttnran-remermm tememen meemin installments. Incidentally, Dorothy, popular M-M & I 24 foot Address 20+ ++-1se-snnnsnranesinee tense mnectesecnnsnnerscnenebeconenenas antnas tasers molor Sailer, was Hanna designed. A number hove actually been built as recently published O T i shots show, and here is the latest, from Kings- lon. Ont. (Conlinuedon page 26) O Thank ¥oufor Mentioning Modern Mechanix and Inventions for March ¥ hen Writing to Advertisers 23 8bitD ownload.com

Page 24

THIS GREAT BIG STEAM ENGINE 5 O Model Add 10c for post- age and packing The world’s biggest value in mechanical toys. A preat big steam engine, measuring 7 inches in height by 272 inches in diameter (734 inches in circumference) for ONLY 25 cents. You should see it run, too. It’s a revelation to see the Hy Wheel spin around at a great rate as soon as you a steam up". The boiler is heated by electricity. Just hook up with your house current, fill the boiler with water, and in a few minutes the engine is running at top speed. No mussy canned heat or alcvhy! tv bother with. FULLY TESTED—GUARANTEED TO RUN It is foolproof, harmless, fully tested and guaranteed to run. A sttentific toy that itlustrates the principle of the steam turbine. uns for hours on one filling of water. Every boy shuld have one. Wonderfully we!) made—splendid value for the money. Easily worth a dollar, yet selis for ONLY 25e," with J0c extra for postage and packing. MAMMOTH NOVELTY CATALOG lOc Add lOc more if you want our gigantic catalog, nearly 800 pages of electrie and other novelties, puzzles, tricks, jokes, etc. You never saw a book Jikt it. before. & CO. BIBLE Dept. 919 RACINE, WIS, SURPRISE MATCHES JOHNSON SMITH MIDGET SRE ry ena Dg W ou Emalieatiible wile. € ease TUE Bise ola post: like ordinary age tamp. matehes, As the 200 Pages, victim trfea to light Baid to bring one he gets quite a Food ee surprise. A nuina oE Prica 18c per box, 3 boxes for 25e, 12 for 75 cente. of art. Must — A A AN STAR TOY MAKER Greatest _ 78’ book written. Telia how tọ makę a Pinhole Camera, a Canoe, be seen to be Sppreciated. Muke good money selling them to friends, church acquaintances; ats, R © eich, 3 for 40c, 12 for $1.35, 100 for $7.50, Also obtainable in Leather Binding, With gold edeee. Price ace model Railroad, a Tele: ‘ch, ne EA oe oe ea ee agnis h 5 OH! ang, Tells tying Glass (or use with Midget Bibie 15e graph Draen, a x Kite. Talking MEichine, sa scope. ectris Motor. Electric Dosr Rall, Water Wheel. Paddle Raft, a pair of Skis, a Dog Sled, Bird House, Rabbit Yard, etc. 64 pagcs. 150 iilustrations. PRICE 10«. oe ee BOY'S OWN TOYMAKER, A new book. tells bow to make chemical toya, electrical toys, galvanic toys. mechanieal toys, Dapper toys, cardboard toys. boats, traps, ete. 200 illust-7* Price 25¢ postpaid. FUN WITH MAGNETISM. 50 novel and 8 tn MAGNETISM that you can perform with the aid of an ordinary magnet: magnetice chain, Peeing and = spinning needle, nail and of limited —— ball cluster, magnetic fish, meang to |top, motor, magnetic billiard balls, many other appear etunts. Also interesting information about prosperous lodestone, magnetism, electric ty, ete. PRICE 10c p.pd. by Bashing | 57: = a roll ofi BOOK ON BOATS. How to build rowing, sailing bosts. Everything pertaining to boate these bila | explained in plain terme eo anyone gap under- SERPENT'S EGGS Box contains 12 ears When lit with a match, each ons gradually hatches itgel? into | ag woake severa) _ feetiong, whic Š euria and twiste about in a most life-like manner. me Price per box. 16c r 250 Wi iithabunech of these bills, it is easy for each persoL po stpa id. 3 fo A Sa Nat the stand, [hse 10c p.pd. —-- -- - WtuJproper| S-MINUTE HARMONICA COURSE. A 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 ehock full of money-making ideas, recipes, formulas, wrinkles, trade secrets, etc. Busi- Neeses that can be started with ttle or no eanital at home in epare time. 10c postpaid. TRICKS & SOCIAL ENTERTAINER. time and peeling off a eenutne bill or two from the outside ol tbe roll, _ the effeet created wilt be found to be all that can þe desired. Prices, . postpaid: 40 Bills 20c, 120 for 50c, or $3.50 thousand postpaid. NOSE FLUTE The Marie Nose Flute, or Hus manatons, ig & unique and novel musical instrument that ia played with nose and mouth combined. There ' just a little knack in plaving ; i it which, when ..... =w- Paci — quired after a little prac= p id bice, will enable you to 10c Sy Music that somewhat resembles a flute. There LATEST iets et) $ LAA | PACHINE wis. tains hundreds of simple tricks, illusions, di- versions that Anyone c&n do, Also explains secret of second sight. Price 25¢ postpaid. WONDERFUL X-RAY TUBE instrument pro- ducing optical {Husions both surprising and ie no mngerihg. and’ once you have mastered i it you can play all kinda of music with facility Jour urira, Pura See iio bopti a and eane. terior opaning in a pipe stem, and many other JOHNSON SMITH & CO. siroilar Hiusions. Price 1Oc. 3 for 2Sc. } A copy of our NEW CATALOG mailed on receipt of lOc. or (he De- Luxe ditio with cloth Binding = Be Riggerand better than ever.Only book Of tts kind in existence. Nearly 806 pages of all the latesttricks m magic, the newest novelties, puzzles, games, sporting goods- and plants, etc., unprocurable_ elsewhere. Remit by i oney Order. Check or unused U. S. Postage Stamps, for all articles list: above. Can dian money, stamps and Postal Notes accepted if per cent added for Exchange. Address orders for all goods on above and on following page if R A wonderful little i og sti eae N © startling. Withit AONT ON SMIE E LO. mone abiastone,. Prae O lor e JOHNSON SMITH & CO. Dept, 919 RACINE, wis. rubber stamps, unusual and interesting books, curiosities in seed= 24 Con- |! DA f A Real Telephone. Works Indoors or Outdoors. 100 ft or 1000 ft. _ Though this is merely @ very clever toy, it ig quite aa gervieeable far, short distances aa the most elaborate apparatus made and it cae liable to get out of order or to need adjustment; in fact it eannot be rendered inefficient unless roughly handled. No troublesome battery no intricate hook-up," Can be put to practical use from one room to another up ot down @tairs, around corners, etc. The patented sounding dises tranarmit and receive the voice perfectly, making it a really practical talking tele- phone, Set consists of two pinones, tranemission cor” and fuk o.. ooe PRICE ONLY 6G5e per set postpaid. JOHNSON SMITH & CO. LOOK/\,35¢ LOOK =e Greatest wae | 6 b i r g éi » yet. Nine separate : articles in one. Everybody de- lighted with it. Odd, Curious and interest- ing. Lots of pleasure as well is a double Microscope for ex- It 1s also, an a - iZ 83 very useful. It _ amining the wonders of nature. nera Glass, a Stereoscope, a Burning Lens, a Reading lass, a Telescope, a Compass, a 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 eve, Folds flat and fits the pocket. Something great—you need one. Don't mias it. Sent by mail, Only 35¢ or3 for $1.00. ` PISTOL CIGARETTE CASE It tooks Itke adeadly weapon, but it is merely a novel Cigarette Case. Thisclever contrivance has proved itself better than the real thin g in many an awkward encounter. Great fun "stic ing up’ your friends. They squirm and protest it might be loaded. “Pull the trigger and the slide files open disclosing the ciga- Fettes. Well made, li hi Py and compact. eif t Send at once | only ounces. tha FUN ber PRICE Eoun | PoSTPap 395C MICROSCOPE and FLOROSCOPE COMBINES ALL THE POWER AND DEFINITION OF THE MORE EXPENSIVE MICROSCOPE SURPRISINGLY GREAT MAGNIFYING POWER EXAMINE GERMS IN WATER, CHEESE, SUGAR, ETC. There are few things BO interesting and valuable ass Microscope, It enables you to minutely examine mineral animal and vegetable specimene, to test cotton, wool, silk, eeeds, water, flour, cheere, milk, and in fact nearly all erticles of food. Unwhclesome meat can be readily detected and fermenta can be closely watched, Tt 18 exceeding}y interesting to examine the spores of ferns, soda, euzaT, Bait, alum &nd other crystals, the Anet facolact fram mnath amA hattarfler wines, Pirma s Eaire, fliea and insects, while the animaleulse in water are a never-failing eource of won’er. ~“ost interest. Ing experiments can be performed with an instrument such às thia. Place a emal} piece of cheese in & box and allow insects to feed on it fora day or two. Then examine 6 tiny portion of the cheese under the Mi- eroscope and you wiil see little animals, magnified to the eize of large beetles; you can count their lega and A imintea in them the talene nr alawa nnan sanh font also the hair or brietlea upon their bodies. stain _ Or, obtain Bome stagnant water; deposit a emali portion of seum upon the object glaas of the Ane toe ope with ft pin's head, and you will see beautiful ènimalculae swimmmg about with as much freedom ae though they were fish in the boundless ocean, It is a truly wonderful sight and an endless source of interest and enjoyment for everybody. The Microscope is made of brass and is zapa aver Pen . G arendand eltough mall and ‘compact, it will paid, > JOHNSON SMITH & CO. Dep o1 ™™ ERINE IS TELL YOUR OWN FORTUNE With the gid of this dream book LEARN TO and fortune- teller. a keys HYPNOTIZE to your future. This 64 - page ae te tos book tells how. Successful in Explains al] purines: ia j about Hypno- you be wealthy? os Complete with tism. how to dictionary of aypnutize, how dreams with; to produce sleep, how to descriptions and correct interpreta- tions, with lucky numbers, fortu- nate Gays, oracles, divination, palm- istry, etc. Also tells how to tell fortunes by various methods, by grounds of coffee or tea, by domin- awaken a subject, how to hyp- notize animals, hypnotism in diseases, hypnotism for stien- tific practice, illusions and halucinations, personal Mag- oes, by marks. scars or moles, mis- 1 t cellaneous gaines with cards, lucky }| netism, thor, , days. weeks.. months, years: howto | ete. Written in plain, everyday language that anybody can under- stand. PRICE [Oc postpaid. Teceive oracles by dreams, finger nail observations, éte. PRICE 10¢ postpaid. FORTUNE TELLING BY CARDS 64-page booh tells how. Gives the meaning of each and every card, how to deal and lay them out. Everything explained in simple language, PRICE 1I0¢ postpaid. to Johnson Smith & Co., Dept. 919, Racine, Wis. Thank Youfor Mentioning Modern Mechanix and Inventions for March When BW ritingto Advertisers 8bitD ownload.com

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DOT'N'DASH ELECTRIC TELEGRAPH SET 15c floes. vou are boys! A private electric fefepeageds act of your own for 15c! Lots oet den aetulliyg MESSIES to your \ = i fipanla diot iwo sets book them | SALLE

upa., hoan In the directions, for ine way iy ages lor sending and aerodelind No trouble at all to upsin wlth the simple instruc-

tben ihat aceompany each set. dhenslon pn nny standard dry battar obtalnabjo everywhere, Win, ia outfit you can learn 1 Novel to teamamdl and recelve mes- 4" / a Educational sagt. hy tho Morse Inter- EE : ini atinoald Cade, and ina very $ « Entertaining chord Tine baroine anes- Z . veel oporatar. Mounted Sending ser wanton base meas- ede Fe mebes, Nial cinan construc- tian thicpughoyt com- pisen Ithkey sound- {1o o haguonl, mlnjla- one Woatern Union blanks, packed in a neat box, with full Mlustrated instructions —- ALL FOR I5e in a very short time (MUbout battery) postpaid. ; NEON SMITH & CO. Dept. 919 RACINE, WIS. BLANK CARTRIDGE PISTOL and Receiving Become an expert Telegraph Operator

‘Thla well A melp and on va PRICES efMoct he Platal bn 50c tooled on the polfern $1 00 oi the intest oe _ lypet of Ho- i LEAs tiedet, Chie pen ý postal which alone is enough i, acute O burglar, whilst, when boah I H wE probably prore just ma rifatli as a revolver with real builois, wilhout the danger to life. u iakon the standard .22 Calibre Hisoh Cmlrldges, that are obtainable most everywhere, torn (he anost timid woman can use it with perfect caloty aud frighten a thief without risk to herself or ween elne reat Protection Against Burglars, trampa and Dogs. You can have it lying about without the danger at- tacheah do aller revolvers. PRICE ONLY 50 CENTS. Better make and eunertor quality for $1.00. Blank Cartridges .22 eal.. 50c per 100. (iwwhey typo Holster 50c. Not prepaid. Sees Express only. JOHNSON SMITH & CO., Dept. 919, RACINE, WIS. SILENT DEFENDER Used by police officers, detectives, sheriffs, night watchmen and others es a means af self-protection. Very effective. 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 less than two ounces. Handy pocket size always ready for instant use. Price 25¢ each, 2 for 45c postpaid.

Pin ERITEDTAINCD | MAKE YOUR OWN 7 BIG ENTERTAINER RADIO RECEIVER

Re a an Kinjoy the concerts, baseball rames, market reports, latest news, etc. This copyrighted book‘ EFFICIENT RADIO SETS" shows how to make and operate inexpensive Radio Sets, iha dehen nne Riddles., 2L Puzzles and Prob- jem Covpay bortune Teller, 50 Money Mak- (ue Heorede, 26 Experiments in Magic, 58 [the materials for which can be pur- ‘haan in Comic Poetry, 7 Parlor Game3,15 [chased for a mere trifle. Also tells dard irika. IO Funny Readings, 71 Toasts, how to build a short-wave Receiver fat oula for Checkers and Chess. Domi- ffor bringing in foreign stations, posa Pur and Geene, 9 Men Morris, Ana- {police calls, ships at sea. etc. ONLY manwa, otc AN for iSc. Postpaid. 15c, postpaid.770 page catalog IDe. REPEATING AND SINGLE SHOT AIR PISTOLS

Juet what you're

Riwayes wantod, 2 powell high grade Baden Alb Pastol, ehaped like ee Aulointtic, pocket sien, Firea D. B. shot obtainable any- +> af mat mactontie anfe f buya to handle. Two styles—Bingle tat Pintol or Repeater. The Repeater Maa Hahota tn one loading, The Single < Hihat Patol ahoota Air Rifle Darts in ad- ATT t e t a durable: allmetal padeshkelplated: natural grain wood stocks. Front morar aiwebtie, Weighs about 10 ounces. Better È can ab rifle. No license required. BT pa hi Gingie Shot Pistol $2.75, 100 Shot i eyeating Pistol $5.00. Not mailable. Shipped a ta y Eagereas only. Not prepaid. Heart ramittunee (Postage Stamps arenplod) for all artickes listed above, alee in om other ad on previous page JOHNSON SMITH & CO. Thank You for Mentioning Modern Mechanix and Inventions for March When Writing to Advertisers BOYS! BOYS! BOYS! ROW YOUR VOICE Into a trunk, under the bed, under a table, back of the door, into a desk at school, or_any-

Z where. You get lots of fun 3 : fooling the teacher, policemen, , be (eae peddlers, and surprise and fool @ pray Re all your friends besides. ca 2 a The Ventrilo is a little instrument that fits in the mouth out of sight. Cannot be detected It is used in connection with the abore, and with the aid of this wonderful DOUBLE THROAT, OR VENTRILO, you can imitate many kinds of birds, animals ete. Remember you get everything for ONLY TEN CENTS—a booklet giving you full instructions how to become a ventriloquist and throw your voice, also the Double Throat, or Ventrile, the Original Bird Call and Prairie Whistle for giving imitations of birds and beasts, ete. 10c All Sent Postpaid te Any Address for Only MAGICIAN’S BOX OF TRICKS Apparatus and Directions for a Number of Mys terioug Tricks, Enough for an Entire Evening’s ntertainment....,.cc008 Ea-ANYONE CAN DO THEM It is great fun mystifying your frienda. Get na Conjurer e Cabinet, and you will be the Oleverest reliow In your district. It sontaina the 4pparatua for ten fret-clags tricks, wclud- tng The MAGIC BALL AND VASE TRICK Q wooden ball H paced inside, and upon re- pacing the lid baa disappesred and u found n someone else's pocket): The HINDOO TRICK CARDS (ean be made to change com- pletely no less than nve times); DISAPPEAR- NG COIN BOX (a coin, pinced in tbe wooden bor, vanishea entirely or changes into a coin of nother denomination); The GLASS GOB- LET TRICK {scoin u dropped into a glassof water and when the water is poured ont the coin has vanished and is found somewhere elne): the RIBBON FACTORY FROM THE MOUTH TRICK (a seemingly endless: supply of colored paper ribbo:.- ......-- iput OL vour mouth): the "DISAPPEARING HANDKERCHIEF (a handkerchief hel in the hand inyateriously vanishes); the WIZARD'S RING COIN TRICK: the EN- CHANTED o (no but = _ 1» able to make it lay down}; the GREAT RAN AND DICK Tei a are Sica is placed on top of a bat. disappesra, and n eino one haa touchedthe hat). and Jast.but not least, thoGREAT BHANTON! CARTS TRICK, or two from Eo nothing. Full instructions are Jent for performing each trick. In addition to the above. a number of other fests and lusigns art fully explained for whieh yon ran early make or procenti, tbe necessary

apparatui. Price complete $1.00 postpaid. JOHNSON SMI BOY ELECTRICIAN reat Book to Bors 1g Past The HOW and WHY of electricity fully told in simple language that any boy can understand. Scorea of plane and instructions for makine—dry batteries, dynamon, electric motors, telegraph apparatus, telephones, electric lights, electric door beHs, alarms, electric engine, rheostat, mail box alarm, electro-magnets, automatic incandescent flash, electric shocking machine, wireless telegraph apparatus, induction coil, are light, current reverser, ete., ete. Tells sl] sbout electric wiring, static electricity, magnets and maégnetiam, conductors ond insulators, electrostatic in- duction, the electroprope, the electrophorus, con- densers, the Leyden jar, dynamic electricity, the voltaic cell, electromagnets, electrolysis, electro-plat- ing, electrotyping, etc. Also tells how to build a radio receiving set for a few cents. Nearly 100 illustrations. Sent postpaid to any address on receipt oi ONLY 10c, MAGIC TRICKS 1a 250 For Parlor or Stage | VY Ap excellent little book containing nearly 260 ricks for partor or stage, Tricks with cards, coins, handkerchicfs, egga, rings, classes, lowers, thimbles, epoons, hotties, atring. Explaing the mystery of the floating head and scores of other amazing feats of magic and illusions, Also Second Sight, Shadowgraphy, etc. So simple a child ean perform them. Profusely illustrated. ONLY 10c. a IS 125 CARD TRICKS and sleight of hand. Con- taina ajl the latest and best card tricks aa performed by celebrated magicians, with exposure of card tricks used by professional gamblers. Price 25c Fa Little Wonder Crystal Radio Receiver $1 Say what you will about Electrical and Bat- tery Sets, a CRYSTAL set has them all beat 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 last indefinitely. Reception is loud and ¢lear, This Receiver is guaranteed to work equal to the most expensive Crystal Set you ran buy. Has a receiving radius of over 25 miles, or under favorable ronditions up to 100 miles. Construrted of the finest materials throughout, including supersensitiye crystal, assuring quick results. PRICEof Receiver only $1.00 postpaid. Or complete with Ear Phone and Aerial WKit—evervthing all complete— nothing more to huy, $2.95 postpaid. "si, Racine, Wis. 919 25 ar Pa een! ny Cae

MADE EASY

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ST Think of it—over 2 maion i buyers paid $102.50 (cash) for this model No, 5 now offered direct-to- you at way below 14 original price—and on easiest terms besides. Positively the greatest bargain ever offered. Accept the special 10-day trial offerandbe convinced. Seethe neat, perfect work it does—com- pare its bright, shiny newness without risk. Recognized as the finest, strongest typewriter built. acy Terms—only 10e a day Here is positively the chance of a lifetime to ewn a World-famous Standard Underwood No, o completely refinished a; the very lowest price and oesiest terms. All complete with modern improvement? including standard d-row keyboard, back spacer. automatic ribbon reverse, shift lœ k. 2-coler ribbon, etc. Ideal for business and professiona} men— teachers, students, story writers, etc, Don't let this chance pass by, 10 Day Trial You save aver $60 by quick action. Learn Touch Typewriting z These genuine uaranteed Under- woods now only $89.90 icash} whe Learn aeh gpevgiting limited supply lasts. Only $1 down free! Complete (home brings the Underwood for 10 days’ study) course of aon Van“ Sapt System givea with this offer. Fully illustrated — easily earne trial. If you keep it—only 30c¢ a day soon pays for your Underwood on_ our new low price and easiest terms. Send at once before this special offer i: with- drawn, Remember every machine full guaranteed and sent on 10 day trial. ANDY’S SHOP MAIL BOX (Continued from page 23) Earl Keates, of Kingston, Ontario, (stopping place for Canada’s wild geese) has built one of Hanna’s 'Dorothys." Isn't she a nice looking, able sort of boat? Star four power. Kingston, Ont. Dear Sir: Launching Dorothy was a very simple matter as you will see by the pix. We just blocked her up high enough to allow an old car chassis which we borrowed from an auto wrecker to be backed under her, rigged up a tow bar blocked and tied her on securely, hooked it to the back of a car and we were away. It towed along at twelve or fifteen M.P.H., without any trouble. A good place was selected at the lake shore and all we had to do was back the trailer out into the water as far as possible by (Continued on page 28) BUILD A FRONT DRIVE! The details of construction of a REAL BABY FRONT WHEEL DRIVE AUTOas this are now in hiue print and available toyou. Known as the "Silver Bullet," this car puwered by a 4-cyl. muter and equipped with J-wheel brakes, is made of old car parts as Model T, ete¢., all so cheap- ly obtained now, and best of all a machine shop is nota necessity for mak tug such a Fast one Data on using 2-cy!]. motorcycle motors is also included. s stamp for furthur details and immgiiate re EDW. A. BORNTRAEGER, 50N Marshfield Ave.,.Chicaga, III. _ I Qo MONTH for an 8" Swing BACKGEARED SCREW CUTTING PRECISION We. 225 Ibs. LATHE Supplied with cither Countershaft or Motor Drive. Also few Rebuilt Lathes, 9"" to 18%. Easy Terms. Write for Lists. SOUTH BEND LATHE WORKS 82@E, Madison St.. South Bend. Ind. = International Typewriter Exchange 5 N J O K E T B E D FA F = 23! W. Monroe St., Chicago. Dept. 305 7 0) 0 = I enclose La Seu ees No, . 7 .0.B. caen) = ao DEAF Debi OWS THAT = at once fer ays' tria am not perfectly satisfie can m orge ear, alter r bein æ return it express calleet and get my dentsi back. IfI keep it I œ P YERE, wit Artie icia Huse Eden tor = will pay $3 a month until I have paid $44.90 (term price) in full. æ ~-his own invention. He wore th em | . 2 = = day and night. They stop pases head = x, 3 = noises and ringing ears, we NAME eee cette eee tee enter etter eee es re ÅEe m invisible and perfectly comfortable. = ® No one ice m, Cot HS thie = w Addie secs ceeenaes evnee euee ns sence sa neenessesasereseseesee D true sto OW an = = Made Myself Hear,” Also book- Artifictal E TOWA ou aaeanu nie Suleath baeweteleat arene Sift. Jspeiseciene © let on Deafness. Address ar Drum FOPRRRERUE PEGQHRRRRERSEESR OBO RRMRO EDO R BESDEDERERDDRESESOREEOL 9 P, Way, Inc, 741 Hofmann Building, Detroit, Michigan ++ Chl ib 26 Thank You for Mentioning Modern Mechanix and Inventions for March When Ñ riting to Advertisers 8bitD ownload.com

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—because he couldn't entertain [i you, too, ruled out, barred from parties and populari- ty? You are probably just as attim five, interesting, clever as nny one else, Yet others always -upture all the good times while \ou nlone are left out inthecold. Why? Find cut, why and the bars that leat you out will fade away and dis- appear Mest people who miss popu- baay nre I hemselves to blame. Friends wouhd anvate you out if only you had nwi thingy to add to the general gaiety. tor thatan why we have . to entertain trl oher. A nil yei. SO many bask oalality 10 enter- aln is n npecial talent. th yon mention music pral jassi Piano Organ Ukulele Cornet Trombone (the goentest single fac- Piccolo ioe in popularity) they Guitar ney | can never learn l ta play I need a pri- Sight Singing vle feneher. It will cost ce mm h, and take so lenr No, not for me.” tinv vemsain barred retoke because they dies t realize (hat. no one wpe Pick Your Instrument Hawaiian Steel Guitar Vaice and Culture Drums and Traps Automatic Finger _ Control Banjo (Plectrum, 5- String or Tener) Piano Accordion without teachers, tremendous expense, tedious practicing and boring scales. Forget Theories—Do What 600,000 Others Have Done Already, over six hundred thousand men and women have chosen this new method of learning music, many just as discouraged as younow, Andevery single one of them chose this method of learn- ing to play their favorite instrument. Most started towards popularity by coming across such an advertisement as this. At first they may have doubted that a way had been found to make learning to play easy and inexpensive instead of boring and costly. "Cello But ali proved to their Mandolin own satisfaction that Harp they could learn to play ape at home, without a Clarinet teacher, in half the usual time, and at a cost of only a few cents a day! Make up your mind to read this offer through, Take advantage of the op- portunity it brings you, yet place yourself under no obligation . . . the of- fer that convinced over Violin peech Send for Free Booklet And Demonstration Lesson The U, S. Scheel of Music will send you a complete, explanatery booklet and a Frere Denienstration Lesson. All you promise is to read through both book and lessgn— thoroughly. Nothing more, berause one you see this booklet. you will be convince) that you. too, can learn to play your favorite instrument. You won't have to be urgen, You will urge us to hurry your first lessons to yeu, That's a fair offer, isn't it? be satisfied before you begin. If yout want popularity, if you would iike to be able to entertain and surprise your friends. to make real music—Jazz or classicu) —rcll from your finger tips the minute y.: sit down to play—ACT NOW! Mail this coupon tëday! No abligation. Instruuic:is supplied when needed, cash or credit. U. &. School of Music, 2623 Brunswick Building, New Yr.rk City. U. S. SCHOOL OF MUSIC 2623 Brunswick Bldg., New York City Please send me your free beek, "now Yrs 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 fcllowing course: Have You ahrete tu EEEE DESDEN Instrumenti... n... You have 73 seed te n musical genius Italian and German Accordion six hundred thousand Name........-.. cece eee cee eee eee to burn do piny ... that Harmony and Camnosition that the U. S. School of address tbonsanila have acguired Juniors' Piano Course Music Method was the ~ eS eee eters so meNital education ideal way to learn to play. City........46. MGa R State. .aasroaa Wes Thank You for Mentioning Modern Mechanix and Inventions foi- March When Writing (0 Advertisers 27 8bitD ownload.com

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That is what hundreds of men are saying about the Foley Electrakeen Lawn Mower Sharpener business they have started. Last year Woodmaney earned $25 to $30 a day. Morse earned $1520 in five months. Start Your Own Gash Business at Home Now @ There is no other method for sharpening lawn mowers to compare with the Foley. You can turn out perfect work quickly and easily. Simply put the lawn mower in the machine and turn on the power —the Foley Electrakeen System automatically sharpens ALL blades at once. Foley Eleotrakeen Lawn Mower Sharpener Uses same system as the leading lawn mower factories, Sharpens all sizes and types of lawn mowers. Costs you only le a job and you get $1.00 to $1.50. New attachment also grinds axes, hatchets, knives, etc. Walter Dambek writes, "In three weeks I made enough money to pay for the machine and all expenses. . . ,” Big Profits Can Be Earned There is plenty of business waiting for you. People would rather have their lawn mowers sharpened the Foley way because they cut better and stay sharp longer. YOU can start this business in spare time and make BIG MONEY! Small investment—easy /z monthly Ppayments--Spring will soon be here — oe There will be lots of business for you—-Send ponpon or postcard today—no salesman will call. Send for Complete Information Z7odauy\ | Eole Manufacturing Co. | | 306-3 Foley Bldg., #4 Main St. N. E., Minneapolis, Minn. ANDY’S SHOP MAIL BOX (Continued from page 26) Alvin Sletterdahl takes his Mead glider. own picture on his What with flying the ship, picking a lauding spot and snapping this, he's some busy! hand and then hook on with a power boat and pull the trailer out until Dorothy was afloat which wasn't very far, believe me. This was August Ist, and she took in such a little water that it was not necessary to remove any for two or three days, and by the end of Aug. she would not make over two pails full a week. At first we used bags of sand to hold her down but as soon as we found out where the weight was required we secured some old iron grate- bars under the floor. She is powered with a Star four motor and runs at a lively clip, behaves well in a storm and 1s a nice looking boat all the way through, but I did not like the sail plan so I left the sail off for now. Mr. Hanna has told me about a new sail plan and I think I will add this one which will make I think, the nicest little allround craft afloat. Any person who really wants a nice sensible boat at a small cost can make no mistake by. starting right now to build Dorothy in order Tell me how I can start my own Cash Business and make to have every detail ready for the fine days next Big Profits with the Poley Electrakeen Lawn Mower Sharpener. : a S spring, when you should be sailing instead of | ~ | building like we were forced to do on account o- ame ~“eeeaee ote me emp aemee af + eee ® Pe Pe be ere * eee e*t+b bene eee of not starting soon enough. But are we proud | | now. Oh, Boy! ALATES sanaa paan ea AAE E a E n E AEE AE i oe | Yours truly, Earl Keates. jo CHI eee ec eee rece eee aes PEE EEES Mtabe ereirnisspy iaa I . I a a Nee ee a a a (Continued on page 30) rech! T>- 28 Thank You for Mentioning Modern Mechanix and Inventions for March When W ritingto Advertisers 8bitD ownload.com

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DX 11 ALLURING. BEAUTY NEEDS All Full Sized = “Vivian ‘Vance Creations 93" PLUS POSTAGE COMPLETE VANISHING E ent tars mee iL CREAM eee chilli MELEE i ed BE OOD A genuine i EREA ae vour bordarr- Av Sb wo, x ig FACE LOTION Kewularly proed ar a Re geent ior proteting skin and keeping LIP ia sofr. Retreshings tor make- FARFUM Miegularty r i eo n 4 d 3 5 a. as S jä r = f t : REE n EEE y- a $ used for : t ’ ri re rs = F . Fa y : MEEA EUR TEER a g bii Pan NS oF gee. lips one Fle oe 8 aye A i { i z m . 40 ffs vw ree ee eli A s pa i ? i s $ iy : J Poa Od dx 1g ha sodes 11° WORTH TSITES Sie Fate anit every item is of selected ingre- Your Guarantee (SS == SS SSS = eS oa ee r a pei a E Each artie le is guaranteed as represented i PREFERRED TOILETRIES, Inc., 703 EE W Ta ae 3 a re and to please or you may return purchase {50 Nassau Street, New York, N. Y. RU rae Nie tae yee rena and we will refund your money. Send the ll packages containing regular full wes noeuds s Su - size Vivian Vance beauty needs. Upon arrival vaen ut tI phe es alone costs what we ask for SEND NO MONEY 4 I will pay postman 98c, plor asie I can the eleven alluring beauty needs offered here. IF YOU DO NOT CARE TO DESTROY return and get money bark if not satisfied. MAGAZINE SEND YOUR ORDER ON | ttt. Jè a pel acquainted offer. We want PLAIN PAPER or drop coupon in envelope i Name 6 baci da glade oh eee wevd be ear e Bowe aS io mabe m felends, We want you to try and mail to us. Your package containing the Street ee recheado at a bargain price and be con- 11 alluring beauty needs will be sent by ee, eran ee aie een as eS ae ae stead thal the VIVIAN VANCE prepara- return mail. Pay postman $8e, plus postage. GUY ac cde E Stats. ..... ttese ate the ohea you should always use. Clip coupon today— NOW. i l Shade of Face Powder......-.---: Suite 763 Orders from Canada and foreign countri:s must PREFERRED TOILETRIES, Inc., 150 Nassau st. New York, N. Y. À contain M. 0. for $1.50. open--- Ese. Phunk You for Mentioning Modern Mechanix and Inventions for March When Writing to 4dvertisers 29 8bitD ownload.com

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ANDY’S SHOP MAIL BOX (Continued from page 28) Score 1 for Mead Gliders! Here's a good letter from a chap who built one. Just because we didn't design it or publish the plans is no bar to running it—the effort and enterprise and fun resulting are the main issues. AIRPLANE 7 ¥'T Loops, Stunts An 2 A Zooms, Dives Wood Lake, Minn. Gentlemen: I am enclosing a few snapshots of ourselves and our Mead Glider which we built from a construction kit. We have taught ourselves to fly it without a single mishap. We had no previous aero- nautical experience, but can now make 360 degree turns and perfect landings. This glider flies and controls beautifully, and you will note one picture is taken in the air (of myself) at about 300 ft. estimated altitude. wr MANEUVERING HARNESS 8 s Yours very truly, Alvin Slettedahl. By jerking on the string at proper intervals this big kite is made todo any stunta good pilot can do. This shows only afew, Notethe 100-foot tail. Kite comes complete in big J. S. Baxter built this Heath. A good one she is, too This Big Kite 4 9 g | Complete only Here’s the biggest man’s size thrill in kite flying ever J. S. Baxter has the airplane itch, and well he may, for he sounds as though he were steeped in lore. Sudbury, Ont., Canada. Dear Sirs: With your Mag. up here in the C.O. frame room and under discussion we have decided to build that short wave adapter, "but," darn the buts, you have designed it to shock the insides to take the air! Open the big box we send you and get the thrill of your life. The airplane kite with roaring motor comes to you ready to fly, String aplenty is included. Box 15 x 23 inches. Ready to Fly with 100-foot Tail! Get the feel of flying a fighting pfane! The 100-foot tail holds the secret of this stunter’s amazing ability to imitate every airplane maneuver. Directions with each kite. Send 49e Today! (Stamps or Coin) and by return mail we’ll shoot you this unusual kite bargain. AIRPLANE KITE CO. 529 South Seventh Street of a super het. I want to use it on a Philco Model 65 and that's no super het that I know of, so question No. 1 is, will it work on any set? Throw your — or — ballot in the stamped self-addressed enclosed. And with that detail off my chest, let me say that your pack mag. is a pursuit job com- pared to some other allied types of mechani- cal magazines, and boys, here's a tip, lay down your shot guns, open up your peek proof win- dows, hand the white rag to Andy, even if he is in the other camp. His heart is pure dural and he's a head chock full of gears, springs and wheels and I am sure that about so chaste a little tin god there must be ever an ex- quisite aroma of hi-test gas, go take him fellows and put him in the ex-stn. where he belongs. Me? Oh I have a shop which bears the Minneapolis Minnesota singular name of the "dug out" (it is). There's the usual mess of tools and half built seii: me: 30 Thank You for Mentioning Modern Mechanix and Inventions for March When Writing to Advertisers 8bitDownload.com

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yx US UY ea m ANDY'S SHOP MAIL BOX A< abal and a fairly good 16’x5’ engine lathe, tden I am the owner of a Heath Parasol with 4+ tdetufleenon conversion of my own, castings atl lf Od yes, 1 melt the dope up myself. Also, I play atound= with a motorcycle, pretty soon Paes gery to have to paint the outside of the erhale ae I can go on reboring and casting neu petons, there are some other planes up « Church, Pietenpol and another Heath. Ain winter is the only practical time to play with them, Tried the pontoons on the Heath hus wooden props and spray. I couldn't alittle them out fast enough. Like to take a varb at the twin, but always the same story wp here, your prices on the castings are O.K. bart lay on duty and shipping charges. Well, w eat be did. Awd here’s another question, you or some- Dody else said that a Heath Henderson prop abl have 3'6” pitch, Heath's blue prints call dae 2°6" approx., which I have been using. New, darn it, what should give the best per- (uemasee on that little mill, some one else sotl ame a bigger prop and run it slower for letter resolts. Heavens, maybe I have a good Unine after all. Well, good luck, J. S. Baxter. (Continued on page 34) I 4 wan,

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J] Business Œ Drafting beT I U auran hnas ?6 lessons and 600 illustrations, Name e. em eee ek ee ec o Age Š Hemd mme andaddress forfree details, Only.. RAYE BURNE SCHOOL, Dept F-S, Box 1194. CLEVELAND, OHIO AGOTERS ob.iw eas te gene asc abe ee eae dh he caeeaeec deters een lies Thank Youfor Mentioning Modern Mechanix and Inventions for March When Writingto Advertisers 2] 8bitD ownload.com

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PLATE YOUR AUTOMOBILE Faucets, Tools by new method. Our Plating Pow- ders deposit a heavy plate without electricity; dispenses with polishing. Half pint can $1.50 pre- paid. Free particulars. GUNMETAL, CO. Ave. S., Decatur, I. CRASH-PROOF Sf FLIES 200 TO W700 FT. ON 1 WINDING Here's a real flying model, designed by aircraft engineers, made of new CRASH- PROOF material. No balsa or flimsy sticks, Crashes buitdings, fences, trees, etc. without breaking. 200-Ib. man can stand on wings. New patented oiled rubber motor whiris the 12in,prop. Comes ¢omplete ready to fly or in kite. Low prices. FREE! colored folder shows plane in fFght and crashes. Write at once. F 2659 No. Parkside A VESEN Op TS APT C@nicaco, iLeino1s Ss a Dirt Track Racing Now you can break into the racing game. How to build your racer, contest rules, supercharges, bal- ance, speed, "revs," compression ratios—a complete racing treatise illustrated. Postpaid $1. Madisonville, Cincinnati, Ohio. NEW CATALOG 16 For Boilers, Gas, Steam Engines, Cast- ings for 40 binds of these Engines. Pumps, ete., Electric and Water Mo- tors, Gears, Material, Piston Rings. Blue Prints free with Castings. Send zoc for Catalog 16, Refund on Ist order. HOWARD ENGINE & MFG. CO. 2417 N. Ashland Ave. Illinois Sf aye R +, ft i ERAS PLATATS FINEST CHROME STEEL i Razor Blades Unconditionally Guaranteed For Gem and Gillette Razors Seven for $.25, or Thirty for $1.00 Postpaid Specify for which Razor BARNETT SALES AGCY. 279 N. Em lid Are. Pasadena, Calif, RAY KUNS, Dept. A, Chicago Print YourOwn Carus, Stationery, Advertising, labels, paper, circulars, tags. etc. Save money and time. Sold direct from factory only. Junior Pross SB 90, Job Press $11, Power $149. Do popular *aised printing like en- graving with any of our presses. Print tor Others, BIg Profits. Pays for itself in a short time. Easy rules sent Write tor fret catalog o£ outfits and all details. The Kelsey ĉo., K-93, Meriden, Conn. Microscopes — Telescopes — Air Pistols ag 50X Pocket Micro. 2%’’ brass; with slides..... $1.00 20X Junior Lab. Microscope only ..........0045 $1.90 60X Senior Lah. Microscope (itllustrated}...... $2.90 Microcraft Kit with 20% Micra complete ....... $2.90 Microcraft Kit with 60X Micro complete .,.. $3.90 50X to I30X Chemist Micro; complete........... $7.95 [0 Mile Telescope 10X (3 ft.} fibre .........,.. 1 6a Brass Telescopes; 4X..,.89c; 6X...$1.49; 8X...$2,49 Brass Feleseope; 15X achromatic, 17%" long. .$4.5 "DIANA", one shot, Air Pistol; 200 BB f free. .¢ “SUREFFRE’’, 100 shot reptr., 500 BB's free. .$4.95 M. LEE SALES CO. 35 W. 32nd St. New York poet) rrr en Doors Wort Open Furnaces Don't Heat Faucets Drip Windows Stick —Fix Them Yourself In these times when pennies count, many home owners put up with the inconven- ience of household devices which don't operate at full efficiency because they hesitate to run up a big bill with the repair man. Wise householders make their own small repairs — and big ones, too — enjoying the full efficiency of their homes and keeping dollars in their pock- ets to spend for other things. Any hands man will find it no trick at all to repair plumbing, plaster, concrete, electric equipment, etc., following the explicit directions in the Handy Man’s Home Manual This book, just off the press, answers just the questions you would ask of an expert if he stood at your side to advise you on your repair job. It is, in fact, the work of many experts, specialists in their fields. The numerous photographs, explicit drawings and clear, easily un- derstandable text reduce the problem of household repairs to such simple terms that no man who can handle a hammer and saw need be fearful of his ability. | HANDY MAN'S | | ROME Now on Sale at All Newsstands PRICE 50 Cents 50 Certs T ! | HOW TO FIX- : Electric Connections Bathroom Fixtures Frozen Water Pipes Balky Furnaces Radiators Broken Furniture f i i w w Shattered Panes Damaged Screens Cracked Sidewalks Broken Plaster Damp Basements Attic Playrooms Lawn Mowers HOW TO MAKE- Home Furniture If your news dealer i ee A ete terse sold out, send 50 cent. T rh iper ati $ anon Circuits aad Range to Faw cett Pub l 1ca ectric r o è Locks and Latches aes tions, Inc., 529 Sout! Garage Equipment AH Wheels Gas Burners ania :. Radiater Enciotures Bird Baths and Houses Seventh Street, Min neapolis, Minn., and : ’ Kitchen Accessories i Floors and Woodwork Playroom Equipment 3 Eaves and Down uck Boa copy of the Hana: Wanted aia see Bem ota Man's Home Manus. FIX-UP STUNTS FOR THE HOME! | will be sent to you a: : once. See Page 96 i ++ Coll mao- 32 Thank You for Mentioning Modern Mechanix and Inventions for March When Writing to Advertisers 8bitD ownload.com

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The SPRIG BOAT GLIDES LIKE A DUCK { Safe, Slnrdy Craft for Work or Play tt haet lony, 42 inches beam, depth 18 inches. Completely maratar bured ready to assemble with bolts, brass screws, erd oone pt of oar locks. Shipping weight 185 pounds. tedadi ftiher carton, $24.75, freight prepaid in U. S. A. rt fut varninhed spruce oars 54.00 per pair extra. i feat “pute - proportionately larger— two sets locks. Wea ht th pounds, $27.75, any place in the United States Swift and Steady feeb Choonphotut of clear, dry Pacific Coast Sitka spruce— eelde- t known wood for its weight., The Sprig is cut on trae dinars to ride high in the water. Rows easily and is sisal welngded! for an outboard motor. Easy to Assemble tto Mastin vromes to you with every piece cut to fit, anda eiei illuxtrated chart for assembling. Every piece sosueteceuh All hardware furnished. Assembling is a pleas- et datereotinge Job that anyone can do, and thereby pocket Rl sceceheccebepee sHVUTYE. Owners Enthusiastic A Washington resort owner writes, "My Sprig rented more than any other boat 1 have, enclose check for five more, ship at once." A private party says, "The assembling of my Sprig was an easy and pleasant task as your erection chart was so comprehensive." Enjoy Water Sports Get yours NOW by taking advantage of this greatest boat value ever offered. Order direct today. Send check, money order or draft. Bireecceseseeeee CLIP & MAIL COUPON «--ereacene National Tank & Pipe Co., BOAT DEPARTMENT, Kenton Station, Portland, Oregon. Dept. MM2 Please send me illustrated folder of Sprig Boat. Name Address GET INTO THE TOY BUSINESS AS OUR MANUFACTURER Earn Money casting cur new hollow Toy Soldiers, Indians, 5 and 1% Automuybiles, for a firm of many years standing. NO EXPERIENCE required as we furnish full instructions with moulds and buy finished goods. A rare opportunity for these times, so if you mean strictly busi- ness write at once fer full details as 1933 Wholesale Season is Now Starting. METAL CAST PRODUCTS CO. 1696 Boston Road. New York isa 4019 inchos or smaller if de- hrst. Haime price for full length or bie torm, groups, landscapes, pet C #eunal au | or enlargements ofany. pato Aari pleture. Safe return of i Tite lal photo guaranteed, SEND NO MONEY ai Dho Sze) r shapshot (any size) gretelitiaa week you will receive your beautiful dep ree ree ment guntanteed fadeless. ay poet mån 47o i.. mage u Hf 49e with order and we pay postage. Big foo inah enlargement sent C. O. D. 78c plus postage or send 1 sof a4 pay postage. Take advantage of this amazing offer bor Heel your photos today, Specify size wanted, Starntdeacd Act Studios, 908 yw, Lake St., Ashtrays, etc., tepi 2 Dept. 373-C, Chicago, Il. WRITE BE E aAa TODAY LET OS TRAIN YOU AND PLACẸ YỌU! ? ACTIVE men—19 to 55—wanted for Railway and f ius Passenger Traffic Inspection Work, Health- tul, outdoors; travel or stay near heme. Rapid pay ad- vances after a few months' experience, On completion of rk few weeks’ simple home-study, we help place you at $120 to $150 per month up, plus expenses, to start, or re Pon ROn Free Booklet. Costs little—terms. TANDARD INË TRAINING INSTITUTE Div. 603 BUS =e Buffalo, N. Y. NOW — Å Set-tested AERIAL ELIMINATOR Goes Right Inside Your Receiver An F. & H. Capacity Aerial Eliminator equals average 75-foot aerial, 50 feet high. Gives $ greater sensitivity and volume on both local and DX stations. Does away with outdoor aerials, poles, guy wires, spoiled woodwork, lightning hazards, etc. No light socket con- nection, or current used in operation. Chosen for U. S. Naval Hospital use. Installed for any set by anyone in a moment. Concealed in- side—permits moving set anywhere at will. Complete! Each tested on 1127-mile reception. At 8,000 Postpaid dealers, or send coupon and $1.00. F. & H. RADIO LABORATORIES Dept. 43, Fargo, N. D. Send one F. & H. Capacity Aerial for $1.00 (cash, check, or M.O.) enclosed. If after three days' trial I am not satisfied you will refund my money. woe ee eee ee CITY Check Here Cr if Interested in Dealer Proposition mide: Thank You for Mentioning Modern Mechanix and Inventions for March When Writing to Advertisers 33 8bitD ownload.com

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SAVE HEALTH AND MONEY \#UIt Tobacco C.M.L. writes: "Your method certainly takes away the craving forrobacco, makes iteasy and pleas- į a ant to quit, and improves one's health a hundred per cent." No dangerous, injuri- ous ot habit forming drugs. Correspondence invited. Or send NOW $5 for everything needed. Senrc.o.p. if desired. I refund your money if not satisfied. Dr. L. R. Holmes, 1025 Phelan Bldg., Dept, 19,San Francisco, RAT. BUR, RABBIS CHINCHILLAS & NEW ZEALIND WHITES Buy What You Raise - Highest wPriges Paid — Established 19 years. llustrated book, catalog and Fur Farming Magazine, also Monthly Market Bulletin showing prices we pay. for 10 cents. } Two large rabbitries, address one —— nearest you STAHL'S OUTDOOR ENTERPRISE COMPANY Dept. 133D NEW city, N.Y. or HOLMES PARK, MISSOURI 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. Surplus PACKMAG Building Kits Electric Motor, Telegraph, Steam Engine Here at last is your chance to get that key or motor or steam engine you've wanted. We have a number of kits recovered from Mechanical Package Magazines which have been re- turned. While they last we'll sell kits separate from maga- zines for 3 for 25c! Send today! Great fun building! Send 25e to MIDWEST DISTRIBUTORS. INC. 529 So. 7th Street Minneapolis Minn. | | | | | ANDY’S SHOP MAIL BOX (Continued from page 31) Jean was built by F. V. Burgess from ptans of Miss Modern Mechanix, which appear in the new boat book "How tu Build 20 Boats,"' published by MM. That Boat Book mentioned off and on durin; the last few months has finally gathered itself a set of ribs, found a place to get itself built, and is doing nicely under the skilled hand of Westy Farmer, who is editing it. See elsewhere this issuc for an ad announcing it. Apropos of boats comes this one describing a Miss Modern Mechanix hull: Dear Sirs: I am forwarding a couple of snaps which may be of interest. Also a fire protection de- vice for automobiles. Speedboat is one which I built to drawings and instructions in one of your issues. A great deal of pleasure was de- rived in building this boat and it has been very satisfactory in rough water. Second pic- ture is a snap of Dominion Coal Co.'s steamer, Walford, which was driven ashore in the gale we had some few weeks ago. This boat was only four years old. At low tide it is possible to see right under her. The first mate swam ashore with a light. He and the crew were taken off on a bosum chair on a line fastened to the trees on shore. One of the ship's officers was drowned. In this gale the wind at times reached a velocity of 80 m.p.h. and the waves came up over a 70-ft. bank or cliff. Car fuse I am forwarding for your patent expert's opinion. I have this device patented in Canada and United States. I have been an enthusiastic reader of M. M. since its incep- tion. Will send you some more snaps later of models which I have built at odd times. Hoping these snaps will be of interest, I remain, yours truly, 5 5 F V. Burgess. Here's something new in the way of winter: sports—skiplaning. Ralph J. Krasky, of Minneapolis, was manufac turing his own airplane and ran out of funds þe fore he could attach the wings and running gea! Then a happy idea seized him, why not make , > ski-o-plane out of it? So substituting skis for wheels, he tried out thir home-made Pietenpol on ice and snow with ex cellent results. The machine is capable of makin: eighty miles an hour, he says, is easy to manaj (Continued on page 36) 2 aa ao iI 34 Thank You for Mentioning Modern Mechanix and Inventions jor March When W ritingto Advertisers 8bitD ownload.com

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Porn orem ——— ee Ruill yow bam now for that spring launching ft fever Heat hite yeu every year. "How to Build l P OAE E IAEE E EEE I #4 Mauets*' wili give you endless hours of fun. ` | Build Your Own Boat! Send for this neve 144 page book... “Hou To Build 20 Boats” JUST OUT! For that fireside or springtime boat fever there is no richer treat than this collection of famous boat designs—some of them hitherto unpublished. All have been test- ed in actual use; there are no "duds". Get your copy of this eagerly sought file of designs, sharpen up that pencil, grip that hammer and satisfy that old urge to build Here's the Book for ALL BOAT BUGS! ... 700" 07? Poar ON SALE EVERYWHERE FPAHUTIAL LIST OF CONTENTS: octa Hannet Fard powered cruiser—Dorothy, 24-foot sea- If your local newsdeal- e csp mmebtboal Huddy. a Rab; tabloid cruiser—Mayfay, cedeetobt e tubaed deek eruiser—Wanderboat. a 16-foot er cannot supply you, teorde MI Hnis, a 10-foot combination ice, sail and motor- : . eor o omaamme a l, athonal performing Ford A runabout—and send 20c stamps or coin zubae Hua helgin for alj Kinds of boats. a to FAWCETT PUBLICATIONS, Inc. Vb MOUTH TPE STREET MINNEAPOLIS, MINNESOTA -+ sg. thank You for Mertioning Modern Mechanix and Inventions for March Ifhen Writing to Advertisers 35 Sja L J | ae 8bitD ownload.com

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ooo 5 -2 Back Issue Copies NU Mechanical Package Magazine at 4 for Sl So many readers have wanted to get all issues of this fascinating magazine (which is not offered for subscription on account of postal regulations for second class matter) that we have recalled a few copies from the national newsstands to offer at 4 for $1, postpaid. This offer at last makes avail- able back issues that are scarce as hen's teeth and puts them in your hands postpaid, a saving of 10c on each magazine, or 40c saving for them all. Order today an build an electric motor, or steam engine or telegraph key from Packmag parts! Complete With Kits or Prints Send SI Today! MECHANICAL PACKAGE MAGAZINE 529 So. 7th St. Minneapolis, Minn. ANDY’S SHOP MAIL BON (Continued from page 34) and is practically fool proof. The plane h:: ` proved itself practicable on a smooth surface, bu! because of the danger of encountering drifts. } ' is making a more decided curve to the front «! - the skiis. E * * And then here's something for the lightplar: fans who like to contemplate the building of .« motor. Al J. Lepsch, of 1515 So. 10th St., La Cross.. Wis., sends us a pic of a hybrid design which seems very well engineered and quite logical. H: has e two motorcycle engines onto OIK crankcase, and informs us that the child is doir.: well, thank you. Here is what he says: La Crosse, Wis. Dear Andy: Have been reading your mag. since the first issue was on the stands and must say that it sure is the best mag that I have ever read. I built a Heath Parasol about four years ago and meant to send you some pictures of it but never got around to it, but now I've got something I think a lot of the readers would be interested in building. This unusual motor is the product of the brains of A. Lepsch, of La Crosse, Wis. Am enclosing a few snapshots of a four- cylinder radial motor that can be built at very small cost. It has practically no vibration. I had it mounted on a stand built of channel iron and standing on a cement floor and it never moved an inch when we opened the throttle. I haven't had a prop on it yet but we had a large brake drum on the shaft with which we started it. Outside of two old Harley motors there isn't more than five dollars worth of material on this job. Either 61 or 74 cu. in. motors can be used. I used two 1920 model 61 cu. in. motors and the complete job as pictured with two mags and prop hub weighs about 140 pounds. The photos show that I’m not much of a photographer but I hope you will be able to use them as I sure would like to see this in the "Shop Mail Box.'' Yours for more "how to builds." Al. J. Lepsch. I- Thank You fot Mentioning Modern Mechanix and Inventions for March When Writing to Advertisers 8bitD ownload.com

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Yo oeectsrenel mnr le building combination ot: ecan allin one great 12-in-1 Outfit, roaasliong you need to develop eò musde m yont body. Just spend a codra a alay with that snappy Wall thy tig Chest Expander, the zippy abae and dhe other muscle buid- tosa den and WATCH THOSE ride. ¢, WOW! Read list below. The towed bet dese than a five-dollar bill— eph Canine, two great Books and ee lesaon thrown in for good . WAL. i Kua eS i GUARANTEE You don i risk a cent. Examine this wonder- ful 12-in-1 Outfit for yourself, YOUR MONEY RIGHT HACK if you want it va COMPLETE CouRS * oe airs eas „a —= dea Aa No Money Rush Coupon ‘sess Just write name and address #™= = =u mu mu mu mm» in coupon AT ONCE. Pay # ~~ McFadden, Postman only $4.98, plus ac-g 55 East |'thstreet, Here’s What You Get 6-—=-Professional Skip Rope, develops speed, wind and agility. 7—Complete Rowing Machine Attach- ments. 1 tomptele ant of Wall 8—Foot Stirrup, patented, tual postage on delivery. (Ory Dear Mie: Shoot me the Amie ete aon ai for legs, send $4.98 anf Ipay post- # works c.0. D.’ rmpay $4.38, instehie Head Gear ighs, stomach. ` ; T b7- E lüs dorloi pewaiul neok 9--Twelve Weeks’ scientific ae} starry reevarn ood Cie hack It Lae net eatished” an Fe ee ee ate ana Sere immediately ifnot pleased. # return outfit immediately. buctobde # r a complete system tha ' . : ok z kildina pine alas gives Biweriul, symmet- Don't miss a a 7 tome nnt Ch dag hee rical body. Rome pend vk . irst Name 5 awe ies sce Daten a cea tae tliah tenatlan 10—Encyelopedia of Health vane ` rede ear tl» ana and een i -irie ap wr Rit Ie (!——-Book on Jiu Jitsu. E AGQTOSS sareisenrea anina t-s kahile FPiagrawriva 12—-Special! Confidential Sex Michael McFadden i thee Penanda t100 Lesson of startling we oe meee a ? t teeletaral FACTS. as ii e OWI cee a BRO GE eRe ae State. ea we New York, N. Y. Outside T. S. send cash with order. x neti} © « thanh You fu Mentioning Modern Mechanix and Inventions for March When Writing to Advertisers 37 8bitD ownload.com

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RACKING TOWN the Detectives examining equip- ment of plant raid- ed in Cleveland, O. NUMBERS FOR - RAISING BILLS Ass t U. S. Attorney Thomas Arrowsmith examining con- fiscated equipment for raising $1 and $2 bills to 10’s and 20's. Counterfeiters used paint remover to bleach figures off $1 bills. then printed on new figures, using numbers shown. by HOWARD W. AMELI United States Attorney Peake money is fhe product of the most despicable type of criminal. Even the underworld brethren of the counterfeiter look upon him with scorn because in their eyes his victims are usually the poor. In my long career as government prose- cutor for the eastern district of New York state I have never come upon a big-time jewel thief who included bogus money in is portfolio. Only the meanest criminal 33 United Stales Attor ney Howard - Ameli, Nemesis of counterfeiters big and small. Running down counter- feiters is the Secret Ser- vice man’s toughest as- signment because these outlaws are often as clever at mechanics as they are at crime. The relentless Nemesis of fake money makers tells how he pursues his quarry. goes in for "queer." as spurious currency is called. However, counterfeiting has been a łu- crative avocation for the outlaw during the past decade. The American public has been ypped out of more than $50,000,000 by this orm of banditry. Aside from the “easy- money" phase, which is fancied rather than real, this calling has very little to recom- mend itself. Hardly a train leaves New York bound for a federal penitentiary with- out its quota of counterfeiters. Up until the circulation of the notorious B-277 counterfeit series, it was compara- tively easy to detect "home-made" notes. There was always some imperfection. sometimes a grossly visible error in the imitation, to reveal the falseness of the bill. In smashing the B-277 ring which had its base of operations in New York City, the government destroyed the most dangerous counterfeiting agency to be found in our records. Had these crooks been able to function in their nefarious work for an- other month, they would have succeeded in flooding the country with enough worth- less paper to cause incalculable hardship. Modern Mechanix and 8bitD ownload.com

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C COUNTERFEITER Ves Alan G. Straight, Chief of the New York Division of the Secret ‘eevece, belongs the credit of nipping this crew of money fakers. The tee hnirgue Of trailing the counterfeiters is an oddone, and perhaps sercoms mysterious and illogical to the layman. But I am going to tell abont the inside movements here so that the general public might have uo better understanding of how it is protected. was back in the early part of January, 1932, that my office fisi received a complaint on a phoney ten- dollar bill bearing We number B-27723486-A. In the ensuing lays complaints continued to pour in and ont alarin was great because we recognized the foithfulness of the reproduction as one which could be detected only by expert netutiny. By the end of February we dis- covered thal these bills were being "drift- el af the rate of $3,000 daily. Near-perfect Bill Baffles Detectives We held frequent and long conferences. Phere was no denying the fact that B-277 was a singularly perfect specimen. The velerun Sleuths of the Secret Service de- tlared themselves non-plussed at first. One dedinite conclusion was arrived a the I$ 277 job was the work of an expert, undoubtedly the master mind behind it had ww C been in the employ of the Bureau of linting and Engraving in Washington, where the rea! thing is made. Meanwhile the Secret Service Division of Ihe Treasury Department issued a state- Mnt on April 30 in order to foil, as much ıh possible, the continued distribution of Iw bad bills. The statement bore the num- Tee It 27723486-A which is the first check ‘ml warning at its disposal. In this case \ here the rest of the note was so well done, the publication of the number was the most eIleative: weapon. <+vernment Warns Against Fake Money Still {be complaints poured in. The gov- ceument's diligence increased. Nothing was la be spared in trapping these counterfeit- wen. Aller careful analysis by federal ex- umdners, this further word of caution was nent oul from Washington: “B 27723486-A. Ten-dollar Federal re-

Attt ANY OF LINES INnnE CULL AROR CRUDE? ve Hea Ue eS ove amen ci

1d NUMMER ONE AGAINST Wiii H GOV'T HAS WARNED? taventions for March

DOES PORTRAIT LOOK SHADY OR TOUCHED UP?

Here's a counterfeit counterfeiting ma- chine. When sheet of paper is inserted, the key is tapped and lo! out comes a bill that could deceive an ex- pert, so makers say.

Above photo shows the press employed by a New SESE bi York counterfeit crime syndicate. The ring was exposed by the murder of a girl friend of one of the counterfeiters. Fea- EGS DR lg tures to examine on a bill aera My which you suspect of be- hh ia” : ing counterfeit are illus- trated at the left. For lay- men, the most revealing feature is the number, which the government has warned against. Only experts can detect fake bills from imperfect en- graving, aS many coun- terfeiters are excellent artists and mechanics. 39

HAS FIGURE BEEN TAMPERED WITH? 8bitD ownload.com

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$100,000 Plant Turned Out $100,000 Fake Money Beforelt Got Caught Here is a typical counterfeiter’s press. Costing $10,000, the plant in which it is included turnecl out $100,000 in fake U. S. money. Counterfeiting apparatus, along with $14,000 in fake bills, seized in St. Louis, Missouri. Bottles contain acids for etching steel plates. serve note. On the Federal Reserve Bank of New York; series 1928 B; check letter "A"; face plate Xo. 19; back plate number indistinct; H. T. Tate, Treasurer of the United States; A. W. Mellon, Secretary of the Treasury; portrait of Hamilton. "This is a ocd aks counterfeit printed on one sheet of bond paper from photo- etched plates of good workmanship, the back of the note being especially danger- ous. The face, however, is printed heavily in black throughout. Portrait Features Found Imperfect "In the portraiture, Hamilton's face has a drawn expression, the eyebrows being severely shaded and the lines forming the mouth and nose accentuating the details of these features. The parallel cross-hatch lines in the portrait background are bare- ly visible due to heavy printing. The seal and numbering are executed in dull green, This counterfeit has been purposely o ored to create the appearance of age." Beyond those flaws or means of identity, the government authorities were helpless. The unwary general public was not con- sidered proficient enough to spy these B-277 bills except by their telltale number. Mr. Straight and his men worked assidu- ously to run down the members of this ring. Their single bare clue was the undeniable fact that an expert who must have worked in the Mint at one time was the brains of the outfit. Early in July Mr. Straight came into the Pak of a business card used by Harry ills, an engraver, of Providence, R. I. The card was placed under a microscope. It turned out to be the first clue after months of exhaustive work. Counterfeiters must compete with the U. S. money plant, which has a distinct advantage where quantity of product is concerned. Stacks of bills shown here are being made ready for the clipping machine which cuts off and trims the edges. 40 Modern Mechanix and 8bitD ownload.com

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Fx pert Engravers at U. S. Mint Work for Three Months on Bill Portraits In the business of busting up counterfeit Hanya we know that there are little odd beeulintitics to ae work just as hones ure to an individual's handwriting, tle meroscopic examination of the Mills tael revealed the same little curlecues and < lifts ns were to be found in the counter- teit bilis, The card condemned him beyond MIC shadowofa doubt. On July 29, he wrote vut and signed a 32-page confession which pul (he agents on the trail of the ring. A very short time afterward the Secret Servite men f on John Teal, a printer, who for many years had worked in the Bureau of Printing and Engraving. On Sepl. 105 government agents swooped down on the Brooklyn residence of Mrs. Mm y Woods where the much coveted plates were found in the cellar. That is the basic tbrimeiple in the catechism of the counter- feit hunter—get the plates! Counterfeit Rings Carefully Organized Thal is why the B-277 flotation continued even oufter the capture of Mills and Teal, t verything was in vain until the plates were seized. Mills got only $1,500 for mak- 2 ing the plates. They were the first ever touned in the possession of counterfeiters to Þe made of steel. They are usually made by pholo-engraving. In his confession Mills said that he spent three months, night and day, perfecting the < annterfeit B-277. Teal, in his confession, luli how his job was to handle the printing tml of the business. Both men said that the leaders of the counterfeit mob blind- falelecl them whenever they were driven to the plant where the bills were made. (Continued on page 135)

secret service men prevented the country from being flooded with $1,000,000 in bad money. Some of the money and retorts used by gang of Paris coiners who were arrested for melt- ing silver coins for purpose of making ingots.

tipte ia expert engraver at work at U. S. mint in turning out portrait which you see on doilar bills. Two to four months U teyuired on the task. Suitable illumination is provided by ground glass plate which diffuses light over the plate. faventions for March 41 8bitD ownload.com

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Sight Reading Chart Makes Music Lesson Fascinating Mrs. Grace McGinley holding the sight reading music chart she invented. The bass and treble clefs are formed by slender wires on which lettered buttons form the notes. New Wheels for Giant Moguls qe giant Moguls which ply the rails of the New York Central Line are enjoying another improvement in their efficiency in the form ap double disc driving wheel cen- ters. This new type of wheel, shown in the photo below, consists of double disc centers over which are placed the ordinary loco- motive tire. Engineers who originated the idea claim that this new type of wheel is cheaper than the old and 1s substantially lighter, thus reducing the impacts of the wheels on the rails. The greatest improve- ment, however, les in the increase of strength. Other locomotives will be similarly equipped on the N. Y. C. when they are sent to the shops for repairs. RS. GRACE MecGINLEY, Seattle music teacher, has invent- ed a sight reading music chart which has attracted wide attention among music teachers and public school systems. This simple, hut graphic device as conceived by Mrs. McGinley, has the bass and treble clefs formed by slender wires, on which lettered buttons, designat- ing the lines and spaces, can be moved about at will to form any desired chord. The chart is about the size of an old fashioned school slate as illustrated in the photo at the left. To children, particularly, this chart has all the fascination of a new game and is used with equal success in teaching vocal and instrumental music. After the pupil has been shown that *‘C” lives on C line, E on E line, etc., the lettered buttons are reversed to the blank side and a memory test given. When the pupil makes an error, the button is turned over to the printed side and without a word of criti- cism from the teacher, the pupil sees his own mistake. The reverse side of the chart is a slate with a piano keyboard printed in the upper left hand corner. Pipe Is Effective Tear Gas Gun | | When the knob is | pulled like a_ trigger, this “pipe” shoots out a stream of tear gas. | | I t L To gas guns have taken many forms in the past and now the weapon comes out in the form of an innocent looking pipe, which no one could possibly suspect of evil purposes. Fortunately its shape permits it to be held like a pistol. The stem does duty as a barrel to spray the smoke in the cul- prit's face, while a small knob on the under- side works as the trigger. The pipe may be carried in the same manner as its inoffensive brother. How it is held may be seen from the photo above. Double disc center driving wheel installed on N, Y. Central Moguls decreases weight and cost and increases strength. 42 Modern Mechanix and 8bitD ownload.com

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iad )-Man (rew Exp Shown in the accompanying Nya is Simon Lake's new saby submarine known as the “Explorer,” and which proved its practicability in severe diving tests conducted secently, The new undersea raft might be called a diving "Gold Digger,” since it has a loeng steel arm (shown in two tight center photos), which ean reach out front the front atl scoop up such treasures as pearl bearing oysters, giant soft-shelled crabs, and treas- ure chests. Mobility is pro- vided by the two front wheels which do duty as tractor treads on the ocean floor. The craft is operated by “juice” supplied by cables from the mother ship and is furnished from the same source with oxygen for the rew of two men. The sub run descend to a depth of 300 feet, where two 5,000 watt lamps light up the scene. TE ES Shoe et Inventions for March 8bitD ownload.com ore Sea Floor in Baby Sub 4 c} ©

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“OECHNOCRACY—Gospelof the Four modern turbines like that above, of 300,000 kilowatt hour capacity, generate as much power as is produced by every adult worker in the United States! Technocracy would have world currencies based on this energy output tather than on gold, which it claims was effective as a Jtandard only as long as civilization was based on man power. 44 What is Technocracy? This _ potent word, descriptive of a new social order based on the machine, has caught the popular fancy with an enthusiasm un- duplicated since the early days of Karl Marx. But not many people understand what Technocracy is all about; this article is an easily understandable summary. T thousand đollars a year income for everyone! Sounds fascinating, doesn't it—but just a little bit like a pipe dream? That's probably your first reaction, but let's probe deeper into the reasons why Technocracy, the word that is on everyone's lips today as the solution to our economic problems, dares to hold out such a glitter- ing promise. First, what is Technocracy and where did it come from? Its chief spokesman is Howard Scott, head of a T of techni- cians with headquarters at Columbia Uni- versity, working under the impressive sci- entific title of the Energy Survey of North America. It has been functioning since 1920, but only recently have its findings been made public by Mr. Scott and others, and the backwash of depression in which we are caught up made the announcements of time- ly interest. The Creed of Technocracy Technocracy believes that we have been developing machines at such a rapid pace that within a few years so many men will have been discharged from their jobs that the few remaining workers will be unable to support the unemployed by charity, and ihe masses will rise in revolt to take by force the necessities of life which they are no longer able to earn by their own efforts. An endless list of instances in support of their theories could be cited—the talkies threw thousands of theater musicians out of employment; automatic telephones dis- place operators; adding machines take the place of thousands of bookkeepers; electric turbines replace man power as the energy source for all kinds of work-—in fact, ma- chines have already replaced man to such an incredible extent that the output of four modern turbine-generators of 300,000 kilo- watt capacity equals the total amount of energy produced by every adult worker in the United States! But Technocracy would not condemn the machine for these reasons. It is, in fact, heartily in favor of the machine, seeing no good reason why the backbreaking work of the world should not be performed by metal men. Technocracy would simply sub- stitute a new economic system of measur- ing money, which can be briefly described as energy valuation. Modern Mechanix and 8bitD ownload.com

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MACHINE I veryone is capable of expending energy, whether by brainwork or manual labor. Inuka the present system, we exchange this eulpul ol energy for dollars, and if no one regnes our energy we do not receive dol- lain lo spend for our living. | latead, then, of obtaining dollars, Tech- matats propose that energy be exchanged for certifieales and that all work be divided nou Ihat each person has an opportunity to eapend energy and obtain certificates en- ug him to a share of the country's wealth. Figures compiled by the Technocrats in- dicate thal, if all the labor saving machinery boy tbe country were used, the work to be tone could be divided up so that if every wman kabored a little more than 600 hours a venr for 20 years, his efforts would entitle ħin o an income of approximately 820,000 a Yr. While no method has been worked out in dhe Lul as a substitute for our present money wit price system, Technocracy's principal augHestion Covering this ground is that en- ergy certificates be used. These certificates would he the same as money, but would be of ia value to anyone other than the man whose energy earned the certificates—and tbus there would be no point in a bandit's bolkbnog up a man, since whatever certifi- vales he stole from his victim would be useless lo him. Moreover, the certificates would be good for bul a limited length of time, and if not apenl in a month or two would become valueless, automatically doing away with the hoarding instinct. Many problems still confront Technocra- ey hut in spite of critics, the theory has won a wide popular following, and no man who respects the power of an idea can dis- miss it as a fad of no significance. Countless instances in which the machine’ has displaced man power, throwing workers out of jobs, are cited by Technocrats as reasons why our economic order must be revised to avoid collapse. The gigantic shovel above, bit- ing out 20 tons at a time, dis- places a thousand men with hand shovels. Wsactor-drawn combines which cut wheat, thresh it and sack it for delivery have consigned a host of millions of "hired hands’ to oblivion. In other days a man could always earn his primary necessities of food, shelter and clothing by the sweat of his brow during harvest time. The farmer who still depends on man-power must sell his crop in competition with law: om machines. Inventions for March 45 8bitD ownload.com

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Animals ‘CORICKED Into Left—This hippo refused to talk for the "mike" til] a shot was fired in his face. Then he let out a bellow that made talkie history. ones being unsuitable. Right—Prospective dog actor being given a voice test, Only deep throated animal voices record well, higher pitched Okay for sound. Here, Oscar, Hollywood’s famous penguin pet, is Having his voice recorded for the “talkies.” Left—-Jackie, trained lion actor, emit- ting hearty roars for the "mike" in front of his cage. You can't always be- lieve what you hear from the talkie screen. One animal in a scene may be acting while another is doing the "speaking." And hu- man actors may seem in imminent danger of being eaten up alive, when they are really well out of harm’s way! This article takes you behind the scene and explains the tricks of sound cameramen. by CHARLES MURPHY Famous HE most vicious, blood-curdling animal sounds you hear on the screen enter microphones because animals are children —-no more and no less. In my nearly 20 years of training and directing jungle animals—from tiny mon- keys through middle-sized leopards to the largest eclephants—TI have learned they react to the same treatment and in the same way as do children. Withhold their food, and they roar. Tease them, and they spit back. Treat them gently and (at least ou ene) they o True, many are treacherous. I would not today walk among a den of lions without some means of protection. Cameras record the more vicious animals from behind wire 46 Hollywood Animal Trainer cages. But in coaxing animals of all types, sizes and kinds to "talk" for the screen, I have had some amusing experiences. No sound that reaches out among a theatre audience is "surer fire" than that which comes from a deep-throated animal. Nor is any more difficult to catch. The me- chanics of it offer enough troubles, and when you add to that the unknown quan- tity of an untrained beast roving more or less at will around an enclosure, hiding behind bushes or leaping from tree to tree, the difficulties are multiplied many fold. Bears may look friendly, but no more difficult animal to direct ever walked into a scene. Bears and hyenas are treacherous, even obnoxious. Oddly, a bear can move Modern Mechanix and 8bitD ownload.com

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‘OALKING for ATOV

ee RRR IE Oe flere be Charles Murphy, Hollywood's leaqoliong namer, Each animal, before it gees beboere the camera, is put through a zetla of rehearsals lasting several months. framing here illus- nates bow cameramen filmed stam- i pede, (hen synchronized action with trumpetings. tasler than a lion and when he forsakes his “lies” and turns away from the mucro- tbone on an actor, he not only will bite, [ml In also will hug and _ scratch. I veniapig, while not vicious, offers great hittieulty to film with sound. In one recent isetuee the director wanted a scene show- tog an aclor, glued in the saddle because he was having his first horseback ride, thrown I<, the ground, with the saddle sticking to las pants. Then a pig was scheduled to run between the actors legs, lift him up and carry him away. Ibe pig grunted and squealed plenty, and be ran all over the lot; everywhere except between the actor's legs. While pienty of amusing squeals were "canned," the only picture obtained shows the frantic little animal dashing across the set. Some day the grunts will be valuable to add to some wwene showing another pig performing a nimilar bit, but refusing to utter a sound! Inventions for March

Animals sometimes act but refuse to talk. When Holly- wood jungle picture was filmed recently, the elephants stampeded as per schedule, but refused to trumpet. Problem was solved by recording trumpets of elephants in stockade and synchronizing the sound with the pictures. Being child-like, animals look to their trainers for food, water, peace and sleep. We usher them into the world, raise them to maturity, rehearse them daily in various kinds of "business" for years, then send them through their paces for the movies. Perforce, pictures involving the use of wild animals are made within enclosures where they can be caught easily in case they wander out of the scene. Ordinarily they appear in brief sequences, running be- tween two points or merely posing. Occa- sionally they clash or tear up a dummy. At such times their deep growls are real expressions of pee dispositions. Recently Jackie, a trained lion, jumped from a tree onto the shoulders of Melvin Coontz, a trainer made up to look like an African native. Coontz walked slowly down a jungle trail as Jackie watched him from above. As the trainer reached the spot, he raised one arm, as though to thrust aside a branch. For years Jackie has responded to this sign by leaping on this trainer with a roaring Fi 8bitD ownload.com

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Trainers Double for Actors, Giving Cues to Beasts With Arms, Hands Dogs learn to speak when their train- | a ers send them to a dummy, and by motions instruct them to drop basket and bark. Above is an offstage view showing how | animals are filmed in their cages during the making of an African jungle picture- Another case of movie deception. Trainer of the mountain lion, blackened up like African native, gives cue for the beast to leap on him when he lifts his arm, presumably to brush aside the bushes. Months of training have gone into this act. Theatre audiences are not aware that the trainer is signalling to the beast to attack. 48 It may seem that these aviators are in great danger of being chewed up by leopards, but they're perfectly safe. Doubling for actors, they instruct the beasts to growl and perform by motions of arm, which serve as cues to the leop- ards. The audience, of course, is unaware of the deception. embrace. So in the scene. Manifestly no Sane animal trainer would permit even such a trusted animal as Jackie to leap on a stranger. The unexpected might happen. Jackie roared not because he was told at the moment so to do, but because he has roared daily, month in and month out, in playful glee as Melvin and he have rolled around on an arena floor! Wherever possible, the animal speaks at the same time the scene is filmed. It then is unnecessary to record the sound sep- arately and match it with the picture. This adds to realism and saves trouble. Occasionally, however, these beasts of the forest refuse to utter any noise. Not long ago 20 elephants from two famous cir- cus herds raced through a California forest bent on destroying all that lay in their path. Alongside the trail a half-dozen movie cam- eras pointed up at their huge bodies, but the "mikes" failed to catch a squeal. Strictly as scheduled, the herd pushed over small houses, knocked down prop trees, obliterated a village. They had re- hearsed a week for this scene, had learned each move letter-perfect. But the elephants refused to trumpet. They ran through the scene of destruction silently. The sound mixer sat at his appara- tus, ones glued to his ears, but all he heard was the cracking of wood, tromp of heavy feet. That evening we solved the sound prob- lem and made the elephants "talk" for the mixer. From my long experience I conjured up a simple arrangement which then brought to the screen one of the most devastatin combinations of elephant sound ever heard. Quietly, as I moved among the two herds, I had the sound crew place four micro- phones near their feeding grounds. Then we placed the elephants' food just outside Modern Mechanix and 8bitD ownload.com

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wT ere NE Miusophones Concealed About Scenes to Record Voices of Animal Actors — =- Irn sleep can be directed—in one direction, providing hea have an intelligent feader who can understand cues. the miber concealed in the bushes catch the bla-a-a-a’s. OH is range. As the hungry elephants began ta teammipet, a corps of aids shoved the food aithin their reach. Here their trumpeting nna haul ls climax, All this was carefully timed, in order to a iieleenize their noises on the sound track with their movements through the pigmy village, Result: a perfect blending of votent action and savage animal sounds thal created before the audience an illusion uf terralic havoc. Amusing, Thrilling, Deadly Accidents Occur Occasionally some accident wil bring to the sereen a thrilling encounter no director ever would plan in advance. One company, ot location in the California mountains to fitt eougars in their native haunts, came upon n rattlesnake. He measured some tour feet long, was a fine specimen. Wilh the company was an Australian police dog. His owner remarked suddenly, “turn the bloody snake loose and see what Ilnv <lo. My dog's smarter than any snake." Assistants hurriedly brought up the mı- croplione and the cameras were turned full anu the rattler. Then for nine minutes— ROO feet of film—the battle raged. The dog approached his prey much like a curious bov; he seemed to know the rattler could shihe when coiled, and as the dog circled the snake’s head moved around as though un a swivel. After the third strike, the dog moved in quickly and grabbed the rattler hock of the head, thus ending the fight. laler, to satisfy his curiosity, a camera- monn examined the film to learn how long this deadly killer requires to strike. From the coiled position, to the fully extended position in the strike and returning to coil required only five frames, or one-fifth of a second. And the snake's head was blurred on each frame, so fast did it move! Inventions for March

ENET IN BUSHES

Cameraman directing a gorilla, which is ia man dressed in a goriHa suit.

Sound camera trained on a California mountain lion, ready for action, which Starts when trainer gives proper cue. + Here's how a close up of a cougar's head is photographed. The ropes hold him down in place as his growls are record- ed in the mike, the camera being focused on his head. With this scheme the actors, cameramen and director are in no danger of being chewed to hash. 49 8bitD ownload.com

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mediatel present, of their danger. Gas is sucked up into indicator through rubber tube dropped into the manhole. Special meter tells degree of gas present. Why Cannibals Relish Human Meat HY cannibals eat their enemies when- ever they get a chance was explained in a recent lecture at the Royal Geographical . Society, in London. There are a few in- dividual cannibals who acquire so strong a taste for human meat that they may kill and eat enemies or strangers merely to get an enjoyable meal. The real reason for cannibalism, the native chieftain said, is to ward off harm from the invisible spirit of the enemy who was killed. Utility Flashlamp for the Home COLLAP- SIBLE flash- light lantern that folds downto less than one inch in height has re- cently been in- vented by a San Antonio man. Constructed of plated, rust- roof metal, the antern is de- signed to hold any standard two-cell flash- light, as illustrat- ed in the photo at the left. The polished surface, which can be ad- Justed to anv angle, is mount- ed immediately Mirror over flashlight directs OVET the flash- beam in any direction desired. lig ht. 50 NEW device wħich elèctricallý' records'thë presence of ° any toxic, explosive, or other gases, and which will im- tell at a glance the exact quantity of these gases as recently been developed. Designed to eliminate the danger of gas explosions of any kind, the detector will prove a great boon to police and fire departments, industrial plants, oil refineries, etc., for with it it is possible to determine in advance, and from a safe distance, the presence of dangerous gases and the degree To make a test a long flexible rubber tube is dropped into the manhole or thrown into the gas-filled room. Squeezing on a rubber bulb then sucks up the gas into a chamber where a de- tector registers the amount of the gas pres- ent. Lamp Sunburns in 20 Minutes NEW kind of glass used for the bulbs of ultra-violet lamps makes it possible to get a sunburn in 20 minutes. Termed a soft" glass it transmits 50 per cent more of the ultra-violet energy generated in the lamp. This new lamp has found immediate use in the medical field for the treatment of skin diseases and for the cure and preven- tion of rickets. Newly developed glass in this ultra-violet ray lamp per- mits it to sunburn human skin after a 20 minute applica- tion. Efficiency is increased by ''soft'' glass more than 50%. Slickers Can't Go Back to Farm HE chief obstacle to the “back to the land" movement, now much urged both in Europe and America as the only perma- nent cure for unemployment, is seen by a British sociologist in what he calls the "city mind," developed in a large fraction of the world's population by city life during the past century. Most of the people raised in the city have become permanently unsuited for farm life because they cannot stand solitude. They are accustomed to living and Oe in close contact with thou- sands of other human beings and can't break themselves of the habit. They must have whoopee or they pine away, Modern Mechanix and 8bitD ownload.com

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Synthetic Scenery Eliminates eATOVIE Sets i AMENA FILMING PRODUCTION | UGI, one-sided sets built at great cost In Hollywood movie studios to recreate trea (hee camera famous buildings and fa- rnin Settings, are fast becoming obsolete. dud away in round metal cans in the files vutllis of Radio Pictures, are hundreds "lL well known synthetic settings, and -anmeramen are now being sent around the sMIId to gather thousands more, to be used wia revolutionary new process called "rear prejechon.” With (he aid of a newly-developed cello- thane sereen, RKO trick photography ex- tetta HIT combining photographed back- neatnds wilh live actors to achieve the sue elfeet as if the whole cast were trans- peeled to the distant scene. Vhe desired background is photographed upon a Hlm which is then projected onto te rear of a transparent screen, while alion of the play goes on in front. The annern lakes both actors and background, siuubining thetwo. Fhe method will largely save the con- ntiuection of giant wooden sets to represent tamous buildings. !n the early work with tent projection, a frosted glass screen was med, but presented difficulties because of ite mand) size. fuventrons for March ACTORS SCREEN OF GROUND GLASS OR COMPOSITION RESEMBLING a 5 et dE a Scene projected on the transparent screen serves as a setting for the scene being photographed by the movie camera. Contrivance saves expense of huge one-sided sets and eliminates danger of fire. The deception can't be detected by moviegoers. Clear View Camper's Telescope poor for explorers, Boy Scouts and campers in general is a new vest pocket telescope that brings far-away scenes right before your very eves. Its ex- tremely small size can be seen in the accom- panying photo. It is a Six power glass and has achromatic lens which make it possible to get a clear view of the entire field, not blurred at the edges as in the ordinary tele- scope. When not in use the glass may be folded up into a compact unit, placed in a small leather case and stowed in your pocket, where it will be out of the way. Telescope has six power achro- matic lens with fold-up barrel. ot 8bitD ownload.com

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No More Thrills for Firebugs, Alarm Box HandcuffsThem [A A firebug’s Nemesis is this alarm box trap which handcuffs persons turning in false fire alarms. When hand is inserted to turn alarm dial, the cuff automatically clamps around the wrist, and can be removed only by firemen having keys. EOPLE who enjoy turning in false fire alarms are destined to have their plea- sure i curtailed, thanks to the in- vention of an alarm box which automatical- ly handcuffs persons who call out the fire wagons without reason. The alarm box may be seen in the photos above. To turn in an alarm it is necessary to put one's hand through an opening to turn a dial. After the alarm has been sound- ed a heavy steel clamp forms a cuff around the wrist. This cuff cannot be unlocked except by the fireman who has the keys. Unfortunately the device also catches per- sons sending in necessary alarms. Antenna Reduces Man-made Static A NEW type of antenna sys- tem, designed to reduce man- made static, has just been an- nounced by man- ufacturers. Some of the distinctive advantages of this new system, as listed by the makers are: to- tal eliminationof electrical noises, n called man-madestatic; ease of installation, no tools other than a screwdriver being necessary; elimination of expensive line filters which are seldom effective; increase of signal strength on all broadcast bands. The system comes in kit form and in- cludes two transformers, one to be attached to the antenna and the other to the radio receiver; and 50 feet of special low-loss cable which effectively shields the antenna against electrical interference. 52 Transformers and cable in an- tenna system eliminate ‘''man- made" static. Airplane Panels for Blind Flying LYING in all kinds of weather has be- come almost a necessity, and so science has taken a hand in designing instruments which help the pilot maintain a straight and accurate flight line without being able to see out of the plane. Below are seen two panels used on two different planes of the passenger-carrving oe When fog, rain or snow blinds the pilot he simply keeps his eagle eye on his instrument panel. The top photograph below shows the panel arrangement of the Curtiss Condor, while at the right below is the panel on i Ford Tri-motor. Included among the in- struments are a Bank and Turn indicator. an altimeter, a compass, a tachometer, an earth inductor compass and an artificial horizon. Co aa, Instrument panels for aid in flying blind two famous types of planes. Above, the Curtiss Con- dor; at right, the Ford Tri-motor. Modern Mechanix and 8bitD ownload.com

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7 oe fe EE ET ear —— “TRIGHT HAS WEIGHT—AN ELECTRIC LAMP BURNING 2,000,000 YEARS WOULD PRODUCE ONE OUNCE OF LIGHT, (Erzsřer Theory) , — Henry Sevcik, Bogota, Nut. Vs QNR DOLLAR will be paid by Nic Sprank for oddities of science used on this page. Send in your ideas—no limit to the number of suggestions you may make, but be sure to enclose proof of your statements. Maybe your ideas will be hatter than those shown on this page—if they are, Nic Sprank wants them and will be glad to send you a check. Address euggestions to Nic Sprank, care of Modern Mechanix and Inventions, 529 South Seventh Street, Minneapolis, Minn. Inventions for March 55 8bitD ownload.com

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OU an ~i T “i k a aE HOSE who read fiction, and especially Western fiction, will naturally come to the conclusion that an expert shot is some sort of a superman who has been endowed by the gods with some uncanny skill for directing a bullet, with the utmost non- chalance, toward any target that strikes his fancy or arouses his ire; but twenty years on the firing line have taught me that expert shooting is merely a matter of me- chanical perfection. Shooting is entirely a mechanical act. A rifle is merely a tube to direct the force of the explosion and a bullet is a piece of metal which is propelled by that explosion. On one end of the tube is a chamber into which the powder and bullet may be o after which the chamber is closed y a simple mechanical device, leaving the 54 World's record score made at 300 meters by Morris Fisher at Camp Perry in 1923. AH ten shots are in 31⁄2 mn., cir- cle in center of 21 in. target. EXPERI Morris Fisher receiving con. gratulations from Gen. Le jeune, of Marines, on win ning world's marksmanship record. Choosingame- chanically perfect rifle and developing a mechanically per- fect aim will make you an expert shot, as a veteran marks- man tells you here. tube, or rifle barrel, as the line of least resistance for the explosion. Causing the explosion of the powder }+ also a mechanical operation—simply th: releasing of a spring which causes a pin to hit and detonate a bit of highly sensitive explosive, which in turn ignites the powder. All the rest of the rifle is merely added for convenience in handling, while aimins is only the mechanical operation of linins T points on the rifle barrel with the object you desire the projectile to hit. Yes, it's as simple as all that. Anyone not blind or e can perform these easy operations, while any good mechanic. given the proper tools, could turn out : device that would enable you to direct tbv force of your explosion. The difference be tween shooting at something and winnin:: Modern Mechanix and 8bitD ownload.com

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RIFLE SHOT t wmpatieon with the youngster in this photo will give you an iM aa to the size of the match rifle used in Olympic contests. COMBINATION | SET TRIGGER: ADJUSTABLE PALM REST t'anenal features of the match rifle are seen in this drawing. he buit is especially carved to fit the shoulder of the tuathaman. Trigger action is faster than in ordinary ride. weifle championship is simply a matter of wefaating the ammunition, the rifle, and fie mechanical motions of aiming the rifle. While any good rifle offered for sale by # telluble dealer will do for hunting, or the shooting done by the average man, tbese rifles, like the good but inexpensive wiles now on the market, are turned out in large E and are not given the Þulividunal attention necessary to obtain me hanical perfection. You will look in vain through your sport- ing Hoods catalog for a weapon such as is waed nt the International Rifle Matches, and there Is us much difference between a store wien and a match rifle as there is between M tlivver and Major Seagrave’s record-shat- tuting nicer. About the only part of the ordinary rifle aed is the heavy barrel turned out by the haat gunsmiths at Springfield; and these are polished by careful lapping in the hands wf experts at the Marine Corps Quarter- master Depot at Philadelphia, the late Gun- nity Sergeant Emil Blade doing most of w work on the rifles used by the American HIN, These heavy barrels are then embedded fuventitons for March By Gunnery-Serst,e MORRIS FISHER, U.S.M.C., Olympic Rifle Champion 1920 and 1924, World's Champion 1923 and 1924, Hoider of 3 World's Records APERTURE SIGHT 32” BARREL LENGTH MAY V champ, aiming the match rifle for a bull’s-eye shot. Note the palny rest, which is used to rest rifle and align sights on the target. TEMPERATURE OF CARTRIDGE POWDER MIRAGE WAVES FROM GROUND The nature of the elements at time of match must be taken into consideration. Strong winds can swerve bullets off path, while heat waves from ground cause target to shimmer in the sights. Temperature affects speed of the projectile. carefully in an over-size stock such as is shown in the accompanying photograph, while an expert wood-carver, who makes fine violins in his spare time, works on the stocks until the balance is perfect. Some excess wood is left on the butt, and this is carefully rasped to fit the individual requirements of the man who will shoot that particular piece. Four refinements, that will not be found 55 8bitD ownload.com

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_ the service rifle, elbow rests on knee. Here's Correct Way to Fire From Prone, Kneeling and Sitting Position Morris Fisher here demonstrates the correct kneeling position with _ r in any other type of rifle, are then added. These are an adjustable fibre butt plate which exactly fits the user's shoulder, an adjustable and removable lower prong which counterbalances the muzzle weight when the piece is fired from a standıng position, and adjustable palm rest, and an adjustable front sling swivel. The palm rest is a large cork ball which may be moved, after the user has taken his position, until the sights are lined up on the target without the shooter having to move from his natural and comfortable stance. The butt plate and sling swivel answer the same purpose as the palm rest, in that they permit the shooter to take up a normal position and then to adjust the rifle to the target, rather than to take a strained posi- tion in order to line up his sights—a defect to be found in all ordinary rifles, for one can never depend upon the target being in the same relative position to the ground he stands on at all times, The most popular sight, although not in universal use in championship competi- tion, is the Lyman 48B aperture sight. The aperture of the rear sight is the size of a pin-hole, while the front sight is a circle of metal mounted on a post. Different sizes of front sight apertures are used on the various ranges, the idea being to have the 56 Correct prone position with Springfield rifle. Note th- both elbows rest on ground and feet are spread apar! Sitting position. When firing in thi- manner the right and left elbow: rest on the right and left knee- respectively, to provide support fe: the barrel. bull’s-eye almost exactis fill the circle when thi rifle is aimed. Haying attained me chanical perfection in the barrel, stock, and sight, the trigger action is now speeded up. To «1 erson who has fired but ittle it will seem as if the trigger pull and explo- sion are simultaneous; yet any expert shot can tell you that there is enough lag be- tween the time the trigger is pressed and the firing pin meets the primer to allow the sights to stray from the target. This stray- ing may be infinitesimal, but one doesn't have to waver much to get out of the 3?.- inch center of a 21-inch bull’s-eve at 36t meters. On the match rifles two triggers are used. The first cocks the piece, while the second may be set off at the slightest touch. The heavy firing pin action of the ordinary rifle is noticeably speeded up in the piece we use, permitting the weapon to be dis- charged at the exact instant desired. Good Physique Helps Skill Given good eye-sight and normal deve! opment, the mechanical act of lining up the sights and discharging the piece at the pre cise instant when they are lined up—ani only then—can come only through constan! practice. The average person is a poor sho! merely because he will not take the pains t’» develop those muscles needed to hold the rifle without wavering, and because he wil! not exercise the will power required to re- frain from pressing his trigger until his sights are properly aligned. _It is taken for granted that only ammuni. tion that is as near perfect as possible wil! Modern Mechanix anid 8bitD ownload.com

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eS ee ee _— Ift Hand Aligns Sights, Right Hand Holds Rifle in Standing Position

the snrrect Handing po- Hitinn fot the match rifle. the lett arm rests com- Geotabdy against the side.

be used; but this is one worry that need wal bother the rifleman. While no two bui- lets or charges of powder are absolutely alke, the scientists of the leading arms manufacturers have developed a nearly perfect product, and any of the high-grade cnttridues, if not allowed to deteriorate, <un be depended upon to give good results. [faving overcome as far as possible any mechanical deficiencies in the piece, the ntntmunition, and oneself, there remains Ihe elements to contend with; and the ex- pwl shot must become somewhat of a meteorologist if he expects a good score. ‘Temperature Conditions Affect Accuracy The explosion in the cartridge being simply a generation of heat through the burning of the powder, the temperature of tlhe powder at the time of firing can make ronsiderable difference in the speed of combustion; a difference of only ten de- Wees raising or lowering the shot nearly two inches at 300-yards. Thus the temper- ature must be considered when the sights nre sel, since in International matches no sighting shots are permitted, and the match is often won or lost on the first shot. Inventions for March Above — Correct offhand position for service rifle. Right hand holds rifte, while left hand bal- ances it. Left— Working bolt in rapid fire prone position. Since air is heavier when moist, it offers more resistance to the bullet than it does in dry weather. When the light is bright and the weather is hot the mirage will cause the image 9f the target to be distorted. When the wind is from behind it will speed up the bullet, while it will slow it down When from in front, thus forcing you to aim higher to overcome the additional pull of gravity. If the wind is from the side it will carry your bullet with it (one inch for every 100-yvards for each ten miles per hour of wind). All of these factors must be com- puted accurately when setting the sights for the first shot. You may compensate for errors of judgment on subsequent shots, but with every competitor capable of firing a "possible," it may be too late then. Nine Years to Win a Championship! If all of this sounds too complicated for you and you feel that you can never attain this mechanical perfection, it might en- courage you to know that I failed to qualify on the range my first year in the Marine Corps, that it took me three years to make the team, and nine years to win a cham- pionship. The rest was easy. od 8bitD ownload.com

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il. | New X-ray Turns Out Picture fer Sixty Cents in 24 Hours Pupil of New Haven, Conn., school being X-rayed with new machine which makes the picture for 60 cents and turns out in 24 hours. Many cases of T. B. were discovered. Grating Is Non-skid Surface KIDDING on bridges—the most danger- ous place in the world to skid—is a peril that is in a fair way to he relegated to oblivion, thanks to ais development of a new type of bridge floor which furnishes non-skid surface for automobile tires. Known as “Irving Decking" the surface is roughened with a metal grating that prevents the formation of a coating of ice on the surface, and drains off the water rapidly after a downpour. The decking has an even surface and weighs only 22 Ibs. to the square foot, including the supple- mentary beams. Though non-skid, it does not cause any extra hard wear on the tires. The model of the new bridge grating, shown below, was on display recently at an engineering ex- hibition in New York. Here's the model of the new bridge which has special non- skid grating which weighs only 22 Ibs. to the square foot. P high cost of X-ray pictures has hitherto made physical examinations prohibitive to most people, but thanks to the development of a new AS speed ma- chine pictures can be taken for as low as sıxty cents. The new X-ray machine, shown in the photo at the left. will make as many as 150 pictures per hour, and deliver the nega- tive a day later. It was introduced recently by the Board of Health of New Haven. Conn., where 6,500 of the 10,000 school children were X-rayed for the purpose of detecting incipient tuberculosis. Through the X-raying many interesting discoveries have been made in connection with the health of the pupils that would never have manifested themselves in any other manner. The photo at the left shows a side view of the machine with the pupil being X-rayed. What Does Your Voice Look Like? Speaking to the mike of this ‘“‘strobilion’”? records the character of voice vibrations in a pattern of squares on a revolving disc. Helpful for singers, actors, train callers. T A "seeing show" held recently in Chi- cago by the Cook County Optimetric Association, a strange gadget was to be seen on display. It was a "strobilion," a machine which visualizes and records voice vibra- tions on a revolving disc, as illustrated in the photo above. When you speak into the mike, a pattern of lines forms on a revolving disc to reveal the character of your voice. The gadget proves helpful for singers, actors, train callers, and others who do a lot of shouting. Right Diet Is Key to Long Life Ë YOU want to live to a ripe old age science advises you to follow a program of scientific nutrition. The two main essen- tials are energy foods and vitamins and minerals. After you have fulfilled these requirements you can eat whatever food you like. Milk is found to be one of the chief ingredients of the long-life diet, con- taining most of the necessary elements. Modern Mechanix and 8bitD ownload.com

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ws “AERIAL ‘Boulevard tO speed City “©raffic FENN long search for a means of solving the I tralie problem raised by the alarming sonmestion of Manhattan, the most densely populated area in the world, has at last found wachition in the construction of a novel aerial hiuliwiiy recently proposed by engineers. Following the Manhattan shore fine, as illus- trated, the roadway will be thirty miles long nud) will offer an unobstructed thoroughfare fe vehicular traffic, permitting running time to be reduced four-fifths, it is estimated. Inventions for March 59 8bitD ownload.com

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wee 60 and stopper Reproducing the patting motions of famous Hollywood masseurs, this new vibrator keeps milady’s complexion smooth and clear. It also has many attachments for treatment of scalp and hair, and a buffer for polishing the teeth and massaging the gums which has been scientifically designed by a leading dental authority. A modula- tor on the motor scientifically adjusts the intensity of the vibrations for the individual complexion. Sink filter on This stopper attaches to the sink drain and cannot be removed. Pulling up stopper exposes a rigid screen which catches al! refuse such as hair, lint, etc. drained the stopper snaps back in place. Beauty Vibrator — the ring holding the When water has 8bitD ownload.com Sanitary catsup dispenser Catsup is easy to manipulate with this new sanitary dispenser. The cap, which fits over the top of the catsup bottle, is equipped with an exhaust pipe and a bulb. When you want catsup on your eats you simply point the exhaust pipe in the general direc- tion of the grub and squeeze the bulb, whereupon a stream of the condiment shoots forth. This method eliminates the necessity of giving the bottle a severe shaking when the juice is desired. Square egg poacher When poached eggs come out of this pan they tn squarely on the toast. One to four eggs can he poached in four minutes, starting with cold water. Since the eggs do not come in direct contact with the water the flavor is greatly improved. The aluminum pan may also be used as a frying pam or cake tin. Eggs fit in removable compartmen:. Modern Mechanix ani

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tae OF Humidor and pipe stoker Egg opener ERE separator 4 les nt job of opening soft boiled eggs, peeling | hased huilei] eggs and separating raw eggs is performed be thin thew handy kitchen device. Pressure on the thotterdepiese operates a set of claws which cuts offs shell. Vacuum pipe washer Attractive humidor now on the market preserves fine flavor of tobacco and automatically fills your pipe when it is placed in position shown. The de- vice is operated by hand from the top and con- sists of a plunger which automatically tamps the tobacco into pipe bowl A Ifw esmple teqgiteesom att the bhuth ef iua pipe +» *.het a Irans +MM* pape of dust, remil ool, and that hiting juice. A sleaning POWw- tee de oleapped in- n the pilars of m gitt pide vias to sleaniog the pipe. Hand- power Mio to table slicer k e cap ete: ~ blackener This new hand-power vege- table slicer turns out a wide variety of prepared vege- A minimum of inconvenience and messiness is tables such as shoestring Hevertvesf on cleaning and blackening shoes with potatoes, French fries, Sara- thie new polish bottle which is equipped with a toga chips, vegetable soup pail that wets saturated with polish when you tip stocks, etc. Equipped with we the bottle for a blackening job. A metal cap adjustable slicing units. fie uver the pad when the polish is out of Hee anf) prevents evaporation of the liquid. Invrntions for March O] 8bitD ownload.com

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ONE “HOUSAND ‘WAYS SN In making models for architects and contractors, card- board of several thicknesses, ambroid, a sharp knife, and an assortment of opaque water colors are needed. House Models for Architects A RCHITECTS and contractors can easily fi. be sold cardboard models of proponi buildings, memorials, parks, etc., of their design. They in turn use these models to show a prospective customer just what his building will look like, making them a po- tent aid to sales, and in addition enabling changes to be made in the design which the customer would not be able to do if he worked from prints which he could not understand. Only a small investment is re- quired — various weights of cardboard, wooden bases, ambroid for gluing, sharp knives, P E It is advisable first to make a fairly elaborate model from a set of blueprints, to show what you can do. The models built by the workman in the above ee brought him all the work he couldturn out. Models of prominent struc- tures in your own town can also be rent- out for window dis- a urposes on a ey hace In Chica- go a model of a home, placed in a bank win- the bank's services to home owners, brought much comment. 62 Minneapolis, Minn. Beginning with this issue, Modern Me- chanix and Inventions will publish a series = of articles on practical ways of making CASH FOR MONEY-MAKING IDEAS! Have you worked out some ingenious, practical way of making money, either as & full-time job or a spare time activity? Perhaps some friend or neighbor, r thrown out of work, has used his wits to devise HOT steady patrons, some money-making scheme which brings better returns than the job he lost—this very thing has happened so often recently that many men look on the depression as a blessing in disguise. For all accounts used in this money-making department of the magazine, payment will be made at regular dow with literature on rates. Here's your chance to become an author! Keep your article brief, and address it to Modern Mechanix and Inventions, 529 S. Seventh Street, money which will continue until a thousand items have been pre- sented. Many of the ideas come from men thrown out of regular employment, who are today mak- ing more money than when they held steady jobs! A Community Ad Sheet ORTY-FIVE dollars a week is the current income of a young man whose alert mind saw the profit-making possibilities of a small community advertising sheet. He lived in a large city and the neighborhood territory was covered by downtown papers, but local tradesmen did not care to adver- tise in papers which covered the whole city, for their trade was limited to the shop- ping area. The young man rented a mimeo- graph, solicited ads from neighborhood stores at moderate prices, filled the reading columns with items concerning people of the district, and ran off a four sheet edition. stapled together at the top. Every home in the neighborhood received a free copy of his first issue, deliv- ered on Friday, carry- ing ads of Saturday's sales. Results from ad- vertising were so satis- factory to the mer- chants that they are and the publisher's main job is to take care of preparing the ads and distributing the paper. The idea works equally well in a small town, especially if the town has no local newspaper. Modern Mechanix and 8bitD ownload.com

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MASK 2 3 Bea end = PE Meee Pod [er MASK SET IN FRONT OF PACK ADAPTER Jipsan photographs can Tt meie with masks cut a: sheen la the drawing, Wasting three cxposures on the same film with successive hnt sin pleme A photo so made is shown at the right — r prep eemprany pat a good price for the picture, which e W Wie a p-saw puzzle as an advertising novelty. fig “aw Advertising Photos ul ltt Soa litthe-worked market for in- Hemos advertising novelties which has ponat Juerative to a San Antonio, Texas, «enetan who found that jig-saw adver- taing pholos, as shown above, sold like the wenvethual hot cakes. Any inexpensive cam- tea ed fhe ivpe which uses film packs or vlaha can be used. The photo shown was behest wath three masks, cut to block out vdo areas of the film. Three exposures =e Ihen made on the same negative, plac- ‘om the musks successively in place, so that fan printed the picture resembled a com- pele photograph, ideally adapted to jig- “4 purposes. The company distributed ehia nouvelly as a premium to customers who pbt tolis within the discount date, speed- tun typ collections so satisfactorily that the epera has a steady market for his out- pal which he is expanding among other SHEEN, M envy in “hoes I N he lost his job, a young New York man nade a deal with a small shoe re- nale shop for ;t commission on aJ] business Pþrought in. He figured that convenience was The deciding factor in attracting shoe tepair business, so he organized a pick-up avi vice Wilh house to house solicitors, and sett hud so much business that the repair mian was forced to put in extra help. Divid- ne (he commission with his salesmen and ales women, he soon had a good income and helped others make considerable money. A aldleling, the buying of old shoes at very low prices, added to this income. fuventions for March Dress Exchange Club CHICAGO woman, finding herself with- out a suitable gown for a party. bor- rowed one from a neighbor. From this cir- cumstance she conceived the idea of form- ing dress exchange clubs, each member of which contributed a gown in good condi- tion of which she was tired. On payment of $1 such members were then permitted to select any dress from the stock to be worn on a given occasion and returned in good order. Profits to the organizer were grati- fying, since out of the dollar fee she had only her own time to charge off, and the ex- pense of minor repairs to gowns. Cash for Gold MANUFACTURING jeweler whose busi- ness failed took a $10 bill and set out from house to house to buy old gold and jewelry. He bought for cash. allowing a good margin of profit, turning over his capi- tal several times a day, re-selling the gold for practically its full value to a jeweler who melted it down. Simple testing meth- ods to determine value of gold will be fur- nished by any jeweler with whom one wishes to work. Making a Bicycle Pay A TEEN-AGE boy in a California city had a bicycle but no income. He hit upon the idea of building a large signboard which he mounted on wheels and attached to the back of his bicycle. Advertising space was sold to various local concerns. The boy O3 8bitD ownload.com

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Every photographer has old exposed cut film for which he has no use. This man makes $40 a week cleaning such film, binding the edges with black tape, as shown in the photo, and selling them as menu covers to restaurants. took care of having the signs painted, re- ceiving a sales commission from the sign painter. These were fastened to his travel- ing signboard and he pedaled up and down the streets of his home city, covering resi- dential as well as business districts. The novel appearance of his bicycle ad trailer won much comment from customers who did business with the advertisers, with the result that this ingenious business is now paying the youth an income much larger than he had ever imagined possible. Menu Covers From Film A CHICAGO bond salesman, finding him- 4% self without employment, hit upon a way of earning a comfortable living by making menu covers from old film whic accumulates in any photographic studio. He collected old negatives which the pho- tographers were glad to get rid of, choos- ing the stiff variety known as cut film. These he cleaned thoroughly and with imi- tation leather tape, bound the edges into a transparent case to preserve the menus against the ravages of constant handling. After making up some sample menu covers, he called on restaurants and offered his serviceable article at an attractive price. His income ranges around 840 a week. Party House A COUPLE in a Minnesota college town, finding their large home a burden but being unable to sell it, turned it into a Party House. Retaining two rooms for their exclusive use, the man and his wife rented the rest of the house for luncheons, teas, dinner parties and supper dances at the rate of ten cents a guest. A neighbor agreed to do the catering at surprisingly low figures 64 and also did a good business, though mam of the parties brought their own refresh ments, leaving the left-overs to pay for dishwashing, which was gladly done bs two colored girls living nearby. Collecting Pollen for Profit CCORDING to officials of the U. S. Bureau of Plant Industry, pollen collected from weeds and flowers is in demand by mam medical ee houses whose addresses you can secure from your neighborhood drug gist. The simplest way to coHect pollen is to tie a paper bag over the flowering weed. This is left tied for a few days and then the weed is shaken, dislodging the pollen into the bag, which is then removed. It is not necessary that pollen from each kind ol plant be kept by itself, but small insects and dirt should be eliminated. The cleaner the pollen the higher the price you will receive Revamping Rural Mail Boxes RURAL mail boxes have a way of going to pieces rapidly. Rickety and weather beaten, they are eyesores along country roads and you can capitalize on this dilapi- dation by painting them up to look like new. Most farmers will be glad to pay you a small sum to refurbish them. It will be found advisable, in soliciting jobs, to take a freshly painted mailbox with you tp show what you can do. A set of stencils for paint- ing names, a can of black and one of mois: ture-proof aluminum paint will be all the equipment you need. Distributing Fresh Bread A BAKER out of work made arrangements with his former employer to turn out a special baking of afternoon bread. He Medical supply houses use the pollen collected from weed» for drug manufacture. The photo above shows how pollen is collected by tying a sack over flowers. After several days the polfen is shaken off and the bag removed Modern Mechanix and 8bitD ownload.com

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Heese Hale tloted cards announcing this fact anod eeng ID deliver the fresh bread if Meee so seel were hone in the window before a ecadainn hee So successful was the plan Heat dee was soon ceemployed by the bakery ta bebe oc hvatge of city-wide distribution of tte eldest bres on Chis plan. mashing Beverages to Workers wo US on construction jobs, long- -liotatuen om docks, laborers on road cak o HI do wib a cup of coffee in mid- rep ot alter noon., Supplying them with Haa ter vetape \\ill bring in a nice profit, voy one tas found, It 1s not difficult to get tha scscetel of Ihe boss, who understands ftist ao aetiesdisnp drink will stimulate the sere In renewed effort on the job. A can fer Tatte el, strapped over the back, cups sted cs canal supply of cream and sugar will bee all the equipment called for. In hot aallot a cooling drink, such as iced tea ea lessttoedle, may prove more popular h MI s ofler, Ateteogenohic Training M HHASKA slenographer, unable to find H position, defermined to use her abili- te oe another fashion to support herself. Hs oana ol a want ad she offered to teach chevthoadd and typewriting privately for teb, poom and laundry. She was soon esaapol by n family with two daughters, = teste she remained several weeks. Before hee Heol rogagement was completed she sae arti luled for eight months in advance anol Pesat thal in most instances she was aakit to do occasional stenographic work dese aeh she was well paid. asing Garden Walks IIn spring coining, the season for im- endas the back yard and garden is at Hamel A aunvass of houses with large back eee will vield many jobs for building Selling beverages to workers around docks, construction crews, or even motorists, keeps the wolf away from this man's door. His dispenser is clean, home-made. Coffee is carried on cool days, lemonade or pop during heat waves. garden paths and garage approaches. One lHinois man makes a nice income from this work. To make a walk, he excavates the soil to a depth of two inches and fills the space with clean crushed rock or gravel, which is tamped or rolled. Then he sprays on a cold asphaltie binder (the editors will give you the name of the manufacturer on request) and sprays on small screenings to fillany crevices. With a second application of binder and screenings, the job is rolled and completed. Running a Rental Library UMEROUS housewives, as well as smal! storeowners, are finding a source of revenue in operating small rental libraries. Only a small space is required, a bookcase comprising six or seven shelves each about five feet long sufficing. In large cities there are companies which (Continued on page 13?) taping gardon walks and garage approaches is an uncrowded field of work which this man finds profitable. A two-inch Hei:teese »] giavel in laid and an asphaltic binder applied from an improvised watering can to produce a hard surface, fesventions for March 65 8bitD ownload.com

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New “Developments in the AUTO “World When car thieves attempt to make away with this car, a tear gas bomb. attached to the starter, explodes and drives them out. Owner sets the trap when leaving his auto. How Cars May Look Century Hence WO years ago Emile Fachon, of Reho- both, Mass., decided he wanted an auto- mobile that was "different." Thereupon he started tinkering around in his cellar and the photo below shows what happened. The freakishly shaped body, made of aluminum, rests on an 8-cylinder Ford auto chassis. So efficient is the streamlining that there is absolutely no loitering place for wind. The machine has only one seat but it will accommodate the driver and three passengers. The only trouble, the builder claims, is that he is constantly in danger of being stared at by curious people. Here's what happened when a mechanic wanted an automo- bile that was "different." Streamlining increases speed 25 %. Tear Gas Thwarts Motor Thieves UTO thieves are literally gassed out of their hauls by a new type of car-protec- tive device recently introduced in Berlin. When the big bad robber opens the door and gets sect comfortably to drive the ma- chine, a tear gas bomb suddenly explodes and he is compelled to make a quick exit. The bomb is connected with the starter and goes off when a switch is turned on by the owner. The photo at Ieft shows what hap- pens when bandits attempt a job. Solder Spray Fills Body Dents Dents in car bodies are filled quickly and easily with spray of metal solder from gun operated by compressed air. Te? AUTO repair men a new method for filling body dents will prove a great boon. Thanks to the development of a new metal spray it is possible to do finish filling with cool sprayed metal, thus saving time and effort. Solder metal is fed into a special spray gun, as demonstrated above, and a stream of cool metal is then shot into the break. The spray operates from an acety- lene tank and compressed air line or from a portable air compressor. Any mechanic can master the process in a few minutes, manufacturers claim, making it unneces- sary to remove upholstery from the car and pound out the body dent from inside. Sea-going Auto With Hull Shaped Body Traverses Rivers Easy as Roads WaASHED-OUT bridges hold no terror for the nautical auto shown in the photo at the right. In such a situation, it would simply run down the bank, traverse the stream and climb up the bank on the other side, and go on its merry way. This unique bus was one of the feature exhibits at the nautical salon in Paris, France. A small propeller extending out of the "hull" at the rear drives the car through the water when its shaft is hooked to the motor. 66 il This sea-going auto takes to water when and where the occa- sion arises. Propeller shaft engages motor for water travel. Modern Mechanix and 8bitD ownload.com

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Ne Se ew, | Re f beta fN => fN "= FS GEen OTMAR OEA ft Suspension Dining Table for Motor Campers' Convenience i HE'S wn automobile table that provides iha utmost comfort for motor campers. hem i operates may be seen from the photo Athe arigbl The top of the table is a three- vh oegueetet inch birch board, 44 in. long amf thin wide, with %”x%” slots bore A Ahe four corners. Through these slots aa hawn web straps equipped with ear kles nnd French snaps. Ihe snaps attach to four screweyes in Ho- loo of the cur. The buckles make pos- ele the adjustment of the suspended table tu Whee right height. The straps, passing thenonyb Ihe slots, are arranged diagonally weba neath the board so that, regardless of peatttanw ofthe car, the table may be shifted iv the straps to a level position. Anolher short strap, passing through a th alot at the front side, attaches firmly ta Whe robe rail to steady the table top. When not in use, the table is carried in a He ee whe between footrail and back of front =e cf f tevel rhost fits over spare tire and rides without noise. Inventions for March Table is supported by web straps hung from ceiling of car. Travel Chest Rides Over Tire HERE’S a new convenience for motorists in a travel chest now being marketed which fits over the spare tire in the rear. A bolt and one wing nut hold the trunk in place and hold it firmly, as illustrated in the photo at the left. Inside the trunk there is a generous space for luggage, chains, tools, etc. Though it may be set in place or removed with utmost ease, it will not create irritating noises, as it rides on the rubber. The appearance of the car is much improved, for the trunk completely hides a worn spare tire or shabby cover. Safety Guards for Motorbikes AN TURER of motorcycles has just developed and placed on the mar- ket a novel set of guards which it is claimed make motorcycling the safest method of power travel on the highways. These uards, as illustrated below, are made of eat-treated tubu- lar steel and are tough and almost impossible to bend or kink. They can be easily and quickly attached to the front of the frame of the mo- torcycle. The guards ex- tend out beyond the sides of the footboards and offer maximum protection to both rider and motor- r > e Attached to frame of mud- Cy cle in side- guard, these motorbike bump- SWIPES and Spills. ers protect the rider in spills. 67 8bitD ownload.com

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‘PARLOR MAGIC with Meten an p.s matn eey, NEW LABEL PASTED ON \ > This shows how a Lucky Strike brand label is | cut out ready for sticking over the brand name ; of a Chesterfield, Old Gold, Camel or other smoke. | By moistening the cut out label with the tongue it will be found to adhere strongly to the other cigarette, and to Fecome dry and be almost undetectably ‘“gimmicked.” 63 Upper lett shows a doctored cigarette passed to a spectator. It is hard to den.. “gimmicking.’’ or the alteration of the brand label. Left shows how the labet «i say a Lucky Strike. is fastened with saliva over a Camel brand mark. Right, abo. shows how to put a competing brand of cigarette inte hatful of smokes of the same kind and demonstrate hı the numerically superior brand will kick out the inrruds- The trick us pranfeerred by Xegping alh stile smock. in one side of the hat, and flicking the compen out with the thumb as a loud exclamation is uttere [E THE cigarettes themselves could onis express the keen competition appare! among their manufacturers .. . well! Try this: Drop a bunch of one brand smokes into a hat. Take a lone cigarette ot another brand and skoot it into the enem encampment. Bang! Out comes the in truder with much gusto to he deftly caugh! in your hand. The "how" is absurdly sim ple. The “bunch” is dropped into the ha! taking care that they land in the far con: partment of the crown. The lone cigarett a into the near compartment. What. eft is merely a matter of voicing a Jain! "hang" at the same moment yon snap ti: crown of the hat with your thumb, projec! ing the cigarette high into the air. For s- m a bit of foolery, this goes ave: nicely, How to Tie a Cigarette in a Knot If somebody asked you to tie a knot i: that three inches of paper-covered weed. and that without breaking the aforesaid paper... well, you could be easily ex- cused for humming "Crazy People.” Never theless, the stunt is quite simple. Merels wrap the cigarette in a strip of cellophane. as shown in the picture. You know how to tie the knot. The smoke comes out of the Modern Mechanix and 8bitD ownload.com

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E i PeO TA @IGARETTES -yetatlon n bit limp but otherwise quite atkenble. Fer un odd little conceit, place a Spud, © I hesterield, an Old Gold, a Lucky Strike al s Camel in that order on a table. Use -liges of paper if you like. Now, starting at the pud end and taking the cigarettes in a order -Camel, Chesterfield, Spud, Old uell, Lucky Strike—you can spell the name + each cigarette and always end at the heated which is being spelled. The countin a rigarelte for each letter—goes aroun w begular rotation. Nice of the cigarette penple I" fx things up like this, eh what! here's a one: Have a spectator place his hatla "laut on the table. Take two cigarettes. ¢all allention to this, "two cigarettes, an + Mill number," and then place the pair be- iueon nny of the openings presented by he apectator’s fingers, as shown in the ‘Hote. Continue in a like manner until all [ra ane of the openings are filled, always 'elling attention to "two cigarettes, an even w“wuber.” Then, take one cigarette, "one -igntelle, an odd number," and place this tel cigarette in the last opening. Now, anh hly remove the pairs, taking one -igaretle of each ee ae soe the ather in your left. With the odd -kantele left on the table, hand the con- trata of one hand to another spectator. Hum take the last cigarette and add it to cute handful, saying, "by the addition of Hida ald cigarette, | make my pile odd while aura din even. "Right?" "Right." Neverthe- haa, something magical happens, for when the amokes are counted, the performer (Continued on page 143) thare ahuwa how cigarettes 'T w in fingers for cede and evens” trick. Hight ehows how a cigarette tepaied before being cef te n knot without * ebin the paper. It is rappel In cellophane and ast then he tied, untied and -wanbedt ‘The secret of this anat |. alinple—The fibers ai the selluphane are so wung that the cigarette pa- vey can't get lorn if it wants inventions for March by SAM BROWN How to palm a cigarette. Hold the smoke upright. Take it in the palm of the hand as shown at center, springing it against the middle finger. It will then spring back into the fist that held it originally. Can you pick four smokes up at once with a matchbox covet, without touching the cigarettes? By drawing m your breath the suction will enable you to do the trick. 69 8bitD ownload.com

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World's Largest Windmill to Be Sight of Chicago Fair ty Illustrated in this artist's drawing is the giant windmill to be erected at the Chicago World's Fair. The five wind wheels will generate approximately one million horsepower. “Dragon Key" Prevents Burglary BERLIN inventor has developed a new ecision lock with a so-called “dragon which has caused a sensation among locksmiths. The key in insinuating itself into the door looks like a snake, as you can see in the photo below. The chief ad- — E vantage of such a type of key, the inventor claims, is that it makes bur- glary absolutely impossible. The lock is adapt- able to any pur- pose and proves ample protec- tion for any home. Ordinary methods of lock-picking are useless, since the lock r ke F

i itself is offset 4t some distance — — from the key- Flexible dragon key enters hole. lock as illustrated in photo. 70 QE OF the most startling sights which visitors to the Chicago World's Fair wil! witness is a huge tower supporting fì». windmill wheels. Atop this tower will |!» a lofty aerial beacon casting a powerful beam far and wide over the horizon. An artist's drawing of the proposed pr ect may be seen at the left. The framewa! of the mammoth tower will be of steel si: der construction. At the top of the mun: tower will be a sight-seeing gallery and restaurant. The huge windmill wheels, mounted .. illustrated in the drawing, will genera! about a million horsepower, chietly for i!) purposes of illumination. A rudder moun! ed on a Steel girder will keep the whe! into the wind. Painting in Wood Is Newest Art STRANGE century-old Oriental art h. recently been introduced in this cou: try by Kk. Yamanaka, a Japanese of I: Angeles, Cal. It is perspective painting 1: wood where the artist heightens his iH tance by constructing his painting in reln) and exaggerating his lines of perspecti,< In the photo below, Yamanaka 1s displ;.\ ing his latest creation, “the Mounts: Climber’s Cabin,” the best example of hi work giving an idea of the ; ao depth and detail of this unusual art. 7

K. Yamanaka, a Japanese of Los Angeles, Calif., displ. ing model of mountain climber's cabin. Note how distan. e is heightened by exaggerating the lines of perspecti: Gov’t Urged to Subsidize Health OVERNMENT subsidies for fresh vere tables and other foods containing vil. mines, instead of for foods like sugar «: wheat which usually are lacking in thi public diet, were urged recently by a di. tinguished British physiologist. The necis sary vitamines are present in many fresi vegetables, in fresh milk, eggs and butter in fruits, in meats and in fish and othe sea foods. Under the present condition. of industrial depression and unemplo. ment, working people do not get enough wt these foods. Modern Mechanix ani 8bitD ownload.com

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New "Twin Screw Life Belt" Saves Victim at 10 M. P. H. } NONOMURA, a Japanese lawyer of Los Attucles, had for several years been con- tregeluting a trip to his native country. So semambering his stormy voyage to this -“nutry years ago, and being unable to -#4it, Nonomura turned inventor and at an inventor's exhibit at Los Angeles recently be proudly displayed a new self-propelled lif preserver, on which he has succeeded rte btahving patent papers. Goling around the waist and fastening stat the shoulders in the regular manner, hia preserver has the added feature of twin spews in the rear which are turned by hand with cranks. His device will not only kep Ihe man erect in the water, but can marves forward at the rate of ten miles per heat, Mr. Nonomura is seen with his new styde Hfe preserver in the photo at the left. Deaf Hear Through Head Bone N INVENTION for hearing by the con- duction of sound through the bony etraeture of the head instead of through the eaer ear was successfully demonstrated escently before the engineering society in aew York. How the contraption is worn is illustrat- ee f in the photo below. The heart of the tomfrtiment is a special transmitter worn on the e¢lothing \vhich intercepts the words -yuiken to the deaf or partially deaf person. Ihia transmitter is connected to the oscil- wlot which presses against the bony part „f the cranium when the listening is to be ohp Ordinarily, however, the oscillator is B. Nonomura, Los Angeles lawyer, wearing the fife belt MIn lke a necklace around the throat as which he invented for his trip home to Japan. The twin ‘Heatrated in the photo below screws, turned by the hand crank, drives wearer 10 m.p.h. Pocket Sunwatch for Wanderers VERY useful article for the hunter, camper, or woodsman is a new sun- watch, which is a combination sun dial and compass that en- ables the user to tell the time of day with a few simple mental computations. The calculations are made from a table of latitudes and longitudes carrtedinside the watch cover. Called a "sun- watch," the gad- get fits inside any vest pocket, and is particu- larly valuable to those in the open in giving direc- tion and time, Time is computed from position where an acci- table on vest-pocket sunwatch. dent of forgetful- | l tiase's haw the new device for hearing through the bony ness means that a timepiece has been lost or :#ueute ofhead works. Transmitter is worn in concealed stopped, and where knowledge of time may sasian, while oscillator is held ready for use on necklace. be of especial importance. d ftaventions for March 7] 8bitD ownload.com

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eWECHANICAL Secrets on OE Oe Fo ee oe, on -n f y t. N tr n un ma a -^^ : 1 CORRECT I SKATING | POSITION | HEAD UPRIGHT J. SKATING LEG } BENT AT KNEE ( BALANCING LEG f TURNED OUT- WARD, TOE DOWN, _— KNEE BENT \ (earn tre \ te l ~A 1 ; : j NG -1 r j RIGHT OUTSIDE ` CIRCLE, BACKWARD ‘ : ; Mee og! 7 : a “THE FIGURE 8 ee wee : E START / SKATE EDGE, RIGHT ( FOOT V aL CHANGE r2 E N LEFT FOOT, a ee eee em vee “A CIRCLE ON INSIDE “Sy 4 Pai f ~— p Here are four professional skaters, the secrets of whose profession arc told below. Practice makes perfect here if you master the simple figures first then proceed to more complicated ones, which are simply elaborations of the former. E IS very easy for the ordinary skater to perform those intricate and fascinating figures on ice, and enjoy to the full the "Poetry of motion," as this most beautiful and graceful of winter sports is called. In order to help you to enjoy to the full this rare recreation, we shots! down a few simple rules to guide you in cutting the different figures. First, you need oe skates. Either the "Arena" or the "Carnival" Skates, with special blades, hollow ground to scientifi- cally correct radius, and special saw-tooth toe for per- forming spins and whirls on ice. Your skates should extend to the front edge of the toe and project back a little past the heel. The curve from toe to heel is a matter of choice. The skate should carry the weight of your body under the ball of the foot, not on the heel. Experts select models with higher stanchions under the heel, to give the forward balance, as a runner is poised on one foot. Fancy, or figure skating, calls for very long, sure strokes, the skater making as many figures as possible while on one foot, since it is impossible to travel very far, or make many figures, by use of short, choppy strokes. The average speed skater works too fast and too hur- ried. In fancy skating take your time, make the figures large and deliberately, and practice skating on one foot. It is wrong to keep both feet on the ice, but keep one foot off the ice as long as possible, while practicing long OOO iua THE FIGURE 3 S ay itty il NS ae s] PA 3) | Š T, { s a4 1 \ N Eo aey a meee } 4 ` ey | ON S } 3 \ = po JCHANGE TOA J a nt nae) BACKWARDS `Y # Z NOUS ES SAME 7 N f > ~ 3 Vf FOOT #& I “ ` ` ae seb” = Your first step in becoming a proficient figure skater is to master the correct skating position illustrated in top drawing. When you can perform the circle, practice on the figure 8 and the figure three, which involve only simple motions. T2 Modern Mechanix and 8bitD ownload.com

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+ ts of FIGURE SKATING i curves, and thus learn the difficult balances of one-foot skating. Correct ee of the body makes for graceful figure skating. Hold the head up- right, and from the start learn not to look down at the ice; simply glance down now and then. Bending at the waist is necessary in making several figures, but quickly snap out of the position. The skating Jeg is bent at the knee, both at the beginning of a stroke, in attaining momentum to make the figures, and during the stroke. The balance leg, with the knees well apart, is turned outward and the toe pointed downward, by use of the hip and ankle muscles, the knee always bent, about the same as the skating Ieg. In figure skating the curve of the stroke is done on the four edges of the skate—out- side and inside forward; outside and in- side backward. Continual practice and mastery of plain circles, at least 10 feet in diameter, both forward and backward, skated on all edges, starting right and left foot, for the different figures, consist simply of turns on a circle or change of edge. Start with four plain edges and master each in turn, starting from "rest." If you stand on the left foot, the whole momentun needed to complete the figure must be gained by one stroke or thrust from the side of the right skate, with no suspicion of a previous stroke. Take the stroke from the side and not from the toe of the skate. This starting stroke, powerful enough to carry the skater through the figure, is one of the most difficult to master, but it should be persisted in until mastered, since it is the basis of graceful figure skating. Expert figure skaters recommend that the beginner should acquire the habit of practicing in the same manner as used in competitions, skating each figure three times on alternate feet without stopping. After mastering the four edges the skater should practice the various figures illustrat- ed in the drawings. The forward circle is easy and should be mastered first, followed by the backward circle. Next try the figure 8 and the figure 3. These can be followed by the inside edge forward, the outside edge forward and the serpentine. sr m on `~ # ~ f LEFT FOOT + " ON INSIDE EDGE N \ l y / / RIGHT FOOT ON \ ~~ Sh = £ INSIDE EDGE f Hag’ Wa a Here's a stunt for advanced skaters. The lady is grasped around body and swung ’round and ‘round by her partner. SAW TCOTH TOE For fancy skating you need special- ly constructed skates. Experts se- lect models with higher stanchions under the heels to givea forward balance. The , ” shoes should be a good fit, tightly `Y clasping the foot, A LEFT INSIDE $ to support the vf BACKWARDS J / £ SERPENTINE — — ~~, muscles when you spin or whirl. The tongue should have a slip-in pad. a ce ria RIGHT FOOT ON OUTSIDE EDGE Here are three more fancy 5t€Ps for the beginner. Note that in the figure at left the inside edges only are used, while in figure at right only outside edges of skates are used. The serpentine backwards utilizes the left inside edge of skate. Inventions for March 13 8bitD ownload.com

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Split Seconds for “Error-proof’<Air Records

I CONNECTED WITH E CHRONOGRAPH HAIR LINE CAMERA t

Here's how the timing mechanism is set up for the speed record races. When cameraman clicks shutter, the chrono- graph records the time. Inset shows photo with hair line. MOARING down the final lap of the meas- ured course at the 1932 air races, Jimmy Poolittie not only broke all speed records— averaging 294.386 miles. 16 miles better than the official land plane speed record— but he also put through a severe test a new timing device designed to remove all con- troversy concerning air speed records. The device, which actually splits seconds a hundred ways for "error-proof" air ree- ords, works like this. Assuming that a cer- tain plane is attempting to break a world’s record over a standard 3 kilometer course. Some 600 feet from the pylons at the start- ing and finishing lines, and parallel to them, the "second splitting" mechanism is set up. How Errors Are Eliminated This device consists of two hair line cameras with focal plane shutters and a chronograph, all electrically connected as illustrated above. The snapping of the camera shutter automatically closes the electrical circuit which operates the chro- nograph. This latter instrument is nothing more than a time printing device that stamps the time of the click on a revolving paper tape a little wider than a ticker tape. The chronograph reads in terms of min- utes, seconds and hundredths of seconds. From the developed photo, showing the plane with reference to a hair line, the photographer, by a simple mathematical process, determines the exact second the plane was in position over the starting or finishing line, and calculates the precise speed from that evidence. 74 CAMERA ELECTRICALLY

CHRONOGRAPH STATION.

Positions of these planes rounding the pylons at Washington, D. C.. races show difficulty authorities might have in timing planes by clocking method. | | l L.

Camera set up in tent facing the pylon ready to snap photo of the planes as they round the pylon. The hair line cameras have focal plane shutters and are_ electrically connected with the chronograph set between station». Birds Hear Far-away Explosions NEV evidence that birds have some mys- terious sense which makes them able to detect powerful sound waves coming from enormous distances, is reported. When test explosions were set offin Hol- land, at most of the experiment stations in Great Britain neither human ears nor deli- cate instruments detected anything. From one British locality, however, came the re- port of a sudden disturbance among birds at the exact minute when the distant sound waves should have been arriving. Modern Mechanix and 8bitD ownload.com

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lority ‘Aysejnded BZulseassul Aqaiayy sso. uonInpoid assvaas -ap pue paəads oome 1s00q 0} pəpədxə əJe ‘Jənrəamoy ‘suadojaaap JUJJ 7s3s02 UAPNHSUOI Jəmoj U pue peads winuixew jo siuiod ul Ajuo sjaoxə əuejd əy? eyy AION] “Jamod epus Jo Joou; ë sey diys Youve yey uon -duinsse əy? uo paseg ase suostedwos əy ‘aded siya uO SSUIMEAP ag} w pəamejdxa Aj jerydes3 aae adueUtsojaad onome pue əyejdiue UIIMJeq SaUdIIYIP JPNUASsI 9Y “NOISEA OULOO.L NV SHA 30 Funivgs JAYT2 -K3 NY $1 SOaadS: MO} ATAMBHLXS IY LHORBH ONISOT LAOHLIM ONY AYR4V8 AIS OL ALIIBY praim ian O3ad¢ WAIN ioe g33d¢ ONISINYD ddd Vv NINWA ¥NWHEL O43dS 40 ILYA IMOT Y Lv KiddOLS MIHIS ‘div ONY 3INISNI HLIM)SINIDS3AG TW3LMIA SRW OHI9DOLOV JHE 0IIAS ANAMIN 1334001 in space Compare also landing speed. 75 e ‘Why of AUTOGIRO Super Oh JNY Id FdAL TYWYON ¥ OL F1GISS3D30NI p ; SBDvdS Ni AIBAYS GNV TOL ALMIAY SHI T os NI $3H03S OHISOLNV 3HL MOH ONIMOHS ae ‘S3H03S ONIDOLT OH SNIMO) auosaa sonwasia SI TOY . SNIGNYT ONY SNIRSvOdddV FI@YHAICISNOD Y duvmMaod<. “a | aie — STI0Y LOJ ANIOd gl ure S = : StHL iv ONNOHG SBHONOL aNW Id Rite lee ie elo) udale Enn meee le) ial) SQ33dS CGHUYMHOd 3A! LDadS qe HJH NI ALYS JHL 40 vad! JANOS SQuOs4dV OSTY SdiHS 30 NOILISOd CUPIN NYA OlHd YHOO Ni OFiS VY HLNOD JYu3H SY L334 009 OL QW ONY 340 BWV1i HO3 GEXd IND Fd SADNVASIG gA GNY 44O A¥MVIL fi ‘ldoddns #3? ONMHWIND Ny 2GtA0ked ABHL LivH3 40 NOILISOd WO OaadS GYYMHO JO SS3IGHvO3e Gaads ANWISNOD LV AAIOASH S30V 1S HOLOY 3 T1GIxX3744 SNINMOGHd L . SRIV 1G BOLOd SNIAWARE: 40. IXY LNOBY . ATIWOLLESA SGN 39830 = NidS LONNYS aae . a T: f Bowe. : tt = ee a : Bo cs 5 2 i E + Oar PONGOYd OL Javi 30 O39 s. CYVMYOd NOdn T3HiLN3 GN3d30 SONUA GION PA r

8bitD ownload.com Muperior climb of the autogiro is revealed in the fact that in 30-mile wind it can climb to altitude of 500 feet uf 100 feet, while the plane requires 1000 feet, and then is in danger of going into a spin. Inventions for March

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AIRPORTS eModernize with Huge Clocks

Progress made in aviation is further made apparent when effictency experts for the Heston airfield deem it necessary to install a huge clock for convenience of rushing passengets. ROM the dusty tarmacs of yesteryear, where gophers dodged and the meadow lark sprang affrighted from the thunder type of plane which can rise vertically and fly forward or backward, or hover in the air was successfully tested the other day in New York. It is the inven- tion of William Rahn, right, in photo below, who constructed the craft with the collabo- ration of Gus Miller, left, formerly with the Zeppelin works in Germany. The strange looking sky hopper is pow- ered with a Wright Whirlwind motor and is said to be capable of a speed of 135 miles per hour. While this is a news flash and no further details are at this time available, the prin- ciple seems to be sort of an "autogyro on the flat." The wings are disposed about a central axis and apparently change their incidence so as to produce both lift and negative drag which hops the ship along, Possibly the tests were not successful, for nothing further seems to have startled the world from this source, although a plane of these characteristics would certainly set the world on its ear, so to speak.

William Rahn, right, and Gus Miller of New York City, have invented a new type of airplane which will rise verti- cally, hover, and fly forward or backward, so it is claimed. They are shown examining a model of the novel plane. 76 Modern Mechanix and 8bitDownload.com

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cks IlyingSBARREL to Carry 100 “Passengers

VERTICAL

RADIO CABIN

PILOTS’ tom PARTM’T.

PASSENGER COMPARTMENT

LANDING GEAR FOLDED

V REAR VIEW- SHOWING HOW = > < TAIL SURFACES ARE s. PLACED”

Pea

Development of a huge "flying barrel" transport plane capable of eetrying a hundred passengers inside its thick tubular hull is fore- owed by recent successful test flights of the hollow fuselage plane in the photograph directly above, designed by Engineer Stipa of the Italian Caproni works. The picture shows deuble cockpits placed on top of the cylindrical body, but in the refined version of the plane for large scale passenger weffic, the piloting compartment is faired into wing and propeller is driven through gears much like the dirigible Akron. Inventions for March 17 8bitD ownload.com

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Cans Lift Up Water Column in Perpetual Motion Engine French inventor, M. Mirafle, with perpetual motion machine of his invention. Chimney is filled with water, up through which move metal chambers from which air is exhausted. U. S. Time World's Most Accurate NITED STATES time is the most accu- rate in the world. In a recent interna- tional comparison the United States signals sent out from the Arlington radio station were found to be accurate to .0078 second. The U. S. Navy's Observatory precision clocks are kept in a small underground room itself supported inside another room. Both rooms are sealed, waterproofed and insulated against heat or cold. Inside the inner room neither the temperature nor the air pressure varies all year long. Nor is anyone allowed to enter this room for even the nay amount of heat radiated by a human body might alter the precision with which the clocks beat out the seconds. The stars are the only perfecttimekeepers known, and their motion is world's time-standard. 78 T latest in perpetual motion machine» is a fuelless engine devised by a French- man of Paris, M. Miralle. The contraption functions on an application of Archimedes principle of floating bodies, and consists of a sort of thick set chimney made of sheet iron and equipped with fifteen flywheels. The machine is set going by turning one of the flywheels about fifteen revolutions. which subsequently sets the remaining Wheels in operation. Over these wheels passes an endless chain fixed in the interior of the chimney like a motor, in which is also a series of chambers made of vegetable cans. The chimney is filled with water so that the chamber and the endless chain are sub- merged in the liquid. One of the columns of chambers contains water and the other. through a process known only to M. Miralle, is filled with air. The air-filled chambers tend to rise to the surface of the water-filled chimney, thus setting the motor in motion. The photo shows M. Miralle standing beside his invention. 4-Piece Wrench Quickly Adjusted NEW wrench now on the market consists of only four parts and is adjusted in- stantly to fit any size nut simply by sliding a collar. When pressure is applie against the jaw in turning a nut, a wedging action locks the collar in p lace Four piece wrench has jaw securely which takes hold automatically. Street Crossings Now Illuminated N APPARATUS which throws a beam of light across the pavement to warn pas- sing motorists that pedestrians arc about to cross, was introduced in Paris, France, recently. When a pedestrian is ready to cross, he presses a button on the post"and his path is lighted for the small period 1ecessary for crossing. Light mounted on standard throws beam across road to illu- minate path for pedestrians. Accidents are thereby reduced. Modern Mechanix and 8bitD ownload.com

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New Aquarium Heater Keeps Water at Right Temperature Pht! the use of an aquarium heater re- + Hilly introduced, it is possible for toegtheal fish to enjoy a home up north - Wout the usual dangers of overheated or alt water. This new heating appliance is senstgueted= = with the famous built-in- -ale hman thermostat, which automatically soattals Ihe aquarium temperature. The ia ling clement is enclosed in a small _tiemiunt plated copper tube and is about ‘tilt inches long. It is installed bv plug- riny the cord in a convenient outlet and fuk the heater over the side of the eee UNI. You'll Catch Cold in Any Climate VERAGE Americans have three colds vach year, more or less regardless of abere they live or what they do about it. I hese colds come in waves, sweeping over aa ommunity or even over the whole coun- u\ much as does an influenza epidemic, alibough far less fatally. The most colds eHinur between September and March but there is no consistent peak during this period, the time of most numerous colds in any one locality being determined by the .bb and flow cf the epidemic waves men- aned, Preserves Newspapers Forever wo ee which have been filed uway for future reference have a way if nging rapidly and reaching their period uf decay early in life. To preserve these papers over a greater length of time, or forever, as the inventor . hums, a new paper treating process has hren developed which preserves the sheets nufely against the ravages of time. A special coaling of transparent material is laid over ihe Sheets which seals them hermetically against the air but permits them to be read. Newspaper pages are preserved forever against the ravages af time by a special coating of transparent material. Inventions for March thermostat control to keep water at correct | | Hooked over edge of aquarium, this electric warmer has temperature. Heater Fans Warmth Thru Room DEAL for chilly mornings as well as for hot summer days is a combination fan and heater recently placed on the market. The device comprises a thermostatically controlled heater unit and a slow moving fan to circulate the heat throughout the room as ii is generated. When a special switch in the base is snapped in one direction, the 1000 watt heat- ing coll and the fan turning at slow speed is cut into the circuit, but when fhe switch 1s thrown the opposite side, the heating element is cut out and the fan speeded up for cooling in summertime. Thermostat control is provided for main- taining the room at a constant temperature when the fan is being used as a heater. A thick mesh screen covers the blades and elements to guard against burns or clips on the fingers. A mac Warmth from heating element 35 distributed in room by the fan. i, 8bitD ownload.com

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“NREETINGS to hobbyists! We hope that Wyou will like this new Hobby Depart- ment which will be a _ regular monthl feature of MODERN Mecuanrx AND INVEN- TIONS, beginning with this issue. If we do not touch on the subject of your particular hobby, write in and tell us about it. We want your help in making this feature one of broad appealto collectors and hobbyists. tamp and coin collecting probably interest more people than all other hobbies com- bined, but these pages will also reflect the activities of collectors of firearms, first editions, antiques, match box covers—in fact, anything under the sun that makes a virile appeal to the collecting instinct. If you have a unique hobby, write the Hobby Editor and tell him about it; if you have scored a coup in capturing a rare stamp or coin, tell him about that, too. If your ac- count is used in the department you'll be rewarded with a check at regular rates. The Geography of Stamps q temptation to hide an adventure magazine inside the large pages of a geography when teacher isn't looking doesn't exist for the student who happens to be a stamp collector. If he has seen some of the beautiful new stamp issues from tropical countries whose very names breathe glamor and romance, he will find geography the most fascinating of studies. Four of the most striking recent examples are reproduced in the photograph below, and are particularly interesting because of their reproduction of native types. From an ethnological point of view the stamps shown are especially valuable through their selection of typical subjects showing racial characteristics of the particular native races. African issues of this description are ‘ences apres numerous, excellent examples aving been put out by the Belgian Congo. Ruanda-Urundi, Algeria, Tripoli, Liberia, Gabon, French Sudan, and Madagascar. Beautiful specimens have also been issued bv New Zealand, North Borneo, Cook Is- lands, North Mongolia, French Guiana, British Guiana, Dutch Guiana, Rarotonga, and Jamaica. How many of these countries can you place? If the location of more than one or two is unfamiliar to you, the chances are a hundred to one that you are not a stamp collector, for it's next to impossible to stump an enthusiastic philatelist on a ques- tion of geography. Those who are indifferent to the appeal which stamps make to the student will find the sheer beauty of the crisp steel-engraved stamp pictures irresistible. Printed in bril- liant colors, glowing with a vitality which only the steel-engraving process can im- part, the thumb-nail stamp portraits win an undisputed place in the world of art on their own merits. New Stamp Issues ne the more recent new stamp issues of interest to collectors are the seven new Canadian examples, six of which bear a medallion head of King George, the sev- enth being a 13 cent double-sized pale purple pictorial bearing a picture of the old Quebec citadel. Other denominations are Ie green, 2c brown, 3c red, 4c bistre, (Continued on page 143) Striking examples of the postage stamp as an instructor in ethnology, the study of races, are presented above. , An Indian shooting fish, a Rarotongan chief, an Arawak making cassava, and a head of a Murut are shown, left to right. 80 Modern Mechanix and 8bitD ownload.com

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Te Re eS ee ees USTO ee ee eee ee A E A EE o o S, New Process Restores Dull, Dirty Coins to Proof Condition GIVE chemical baths, supplemented in extreme cases by electrolysis in a chem- iwal solution, restore to "proof condition" even the dirtiest coins. A new process, using chemicals which he compounds un- ler heat, has been devised by John Cowles, California chemist and metallurgist. In his “beauty laboratory,” Cowles and his associate, Horace A. Stoddard, have re- cently restored many old coins which in the past could not be cleaned. One %50 gold niece attained a value of S1,000 after its brilliance had been restored. Some 2,000 coins, ee in minted value from one cent to $50, have had the tracks of time removed. Nowhere else does such a laboratory exist, for the art of restoring coins is new. Mr. Cowles neither adds nor subtracts any- thing in the process of restoring the natural uppearance of metals which have become oxidized, tarnished, discolored or slightly scratched. He first examines cach piece under a microscope lo determine how deep- ly into the surface rust has eaten or scratch- vs have penetrated. Upon this examination depends the strength of the chemical solu- lions to which the piece will be subjected. In case the chemicals are nol strong enough, he “boosts” their action by electrolysis. During the cleansing process he cleans oli the fingerprints and dead rouge deposited by time without injury to the orijinal metal. Coin colleclors value fresh looking coins more than tarnished pieces. A $3 gold piece minted in 1<873. if tarnished, is worth $75; in "proof condition" ils value increases to 4300. Proof coins are those struck ot! by the treasury department for expert exami- nation, not for general circulation, and collectors value them highiv. They take “reat pains to retain the original glow, hut in time all coins fade. Mr. Cowles is the first man to restore their original lustre without losing some par! of the metal, he says. So widespread has become the habit of coin collection that the practice has be- come a seiençce—numismatics—and Mr. Cowles’ laboratory is authorized by the government to restore coins. Hare You a Nickel Worth $50? NICKEL that is worth one thousand times its face value! Sounds incredible, but you may have such a Famous 1913 Liberty Head nickel. COIN 1N your own pocket. If it looks like the picture reproduced here- with, your lowly nickel is worth $50. The coin is the famous Liberty Head nickel of 1913. Its value derives from its rarity. The mint has no record of its manufacture.

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Inventions for March

By a process of electrolysis and chemical solvents, dull. dirty coins can be restored to proof condition for collec- tors. Insert picture of hand shews restored coin at left. Science and the Postage Stamp CIENTIFIC achievement, as well as the victories of warriors and statesmen, are now acknowledged by the postage stamp, which is becoming more and more a mirror of contemporary achievement. A most in- teresting example is the Belgian stamp shown at the right, commemmor- ating the ascent of Pro- fessor Piccard into the stratosphere. The stamps show Prof. Pic- card's balloon (a de- scription of which was ublished in MODERN ECHANIX AND INVEN- TIONS at the time) and carry the dates of his two ascents—May 27, 1931, and Aug. 18, 1932.

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Imitation Tyee Stump Is Ornamental Trash Receptack Built of concrete, toughened to simulate bark, this imita- tion tree stump does duty as an ornamental trash holder. Man’s Head Is Natural Radio Set MAN with a "radio brain" has recently been exhibiting his freak capacities in Europe. The seemingly uncanny power possessed by this man permits him to re- ceive radio programs directly without the aid of a receiver or other apparatus. He merely listens and hears the program in- side his brain. Since the actions of the human brain are known to be electric, if is possible that this man's brain might in some mysterious way be a natural radio set. Safety Holder for Fag Smokers OR men whose wives com- plain about ashes on the rug, the invention ofa Cincinnati. Ohio, man will prove a great boon. This new “safety smoker," as the gadget is called. consists of a small box like affair of light metal, with top and sides cov- ered by a light screen. The fag Cigarette end burns safely in a 1S5 Inserted ana wire cage, which holds ashes. held as shown. 82 TRASH cans in general are not expected to be beautiful although they are often from necessity located in beautiful places The public parks in Washington, D. C., are making use of a combined trash container and incinerator which is both serviceable and does not mar the landscape. They re- semble an old hollow stump and are built of concrete. The surface is roughened and colored properly so that at a short distance it js hard to tell them from the real article. The cover over the top resembles a saw cut and a suitable opening is provided for the en- trance of trash. Bars are provided to keep trash offthe bottom and two openings make a good draft so that trash is easy to burn when it becomes filled. Bed Bugs Show We Lived in Caves FAVIDENCE for the theory that human ad beings once were cavemen living in holes or shelters in the rocks, rather than forest dwellers living among the trees, has been discovered by two British experts on insects. Insects of the bed bug group in- fest bats, pigeons and house martins, all of which originally were cave creatures. This suggests that an original association in ancient caves between these birds, bats, bed hugs and man has persisted in man's mod- ern cave substitute; the house. Coin Operated Phone for Home T° PREVENT excessive phone bills and to lessen the "Can I use your phone" nui- sance, a coin-operated lock can now be obtained for either the French cradle type phone or the standard type. In operation, a nickel is inserted in the slot after remov- ing the receiver from the hook and the plunger ts pushed down with the finger. The device can be applied in a few seconds to alf types of standard phones. It is used ın offices, stores and homes where the meter system is employed. Placing coin in slot and pressing the plunger brings phone into action, and reduces excessive phone bills incurred by friends who use the instrument while you pay the bill. Modern Mechanix anc 8bitD ownload.com

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Ships Lifted BODILY in ELEVATOR SHIPS PROCEEDING INLAND ON CANAL" - a HOIST POWER PLANT HEIGHT ee J baat pi EQUAL TO Hiei at ei _ 12 STORIES ATRO eT] eae a a LIFT CABLESS "TANK PIT . th "fh i CANAL [THROUGH Ships enter the 4200-ton tank under their own power. Floating in the tank, they are lifted 110 feet to the level of the canal which carries them to Berlin. An existing ship elevator at Henrichenburg, Germany, is but half the size of this one under construction at Niederfinow. Map shows how elevator will speed up traffic from Baltic ports. SHIP ELEVATOR UNDER CONSTRUCT- ION To relieve congestion on canal between Oder river and Berlin, huge ship elevator shown ablove is being constructed. Inventions for March 83 8bitD ownload.com

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ne ARRAN A A Sell Ud PER n A a Po, com CASS MAGNETIC NEEDLE INVENTED k ee 4 f ~ ALIRADE AND QUADRANT USED IN 2300 B.C. See fe tage AOL RH RAR oR TEN Lane eno POTTERY WAS MADE IN 3OCOBC. | S ; PRINTING ta WITH WOOD pe Me ce HA Ul ey a tre hee ta fe yp me een pe RRR NE TR RN EMRE een a a Hore cane nak Be | BLOCKS ee AE WAS l INVENTED 850 A.D. aai NY Meise EN Te aa en ee aaa o Vm a a e A aa wre Mme na An RNR aR RRR OT ger esa EE r a mAT iar a te ree ELF yt a These pictures toll their own story. AH of these devices, so important to our present civilization, were discovered by the Chinese thousands of years ago. 84 HERE there ain't no ten commandment and a man can raise a thirst, there’s in ancient science extant that looks like thx very first. We think we're the only oncs who know smelting and hydraulics ani ceramics and printing and electricity. Bui old John Chinaman had a civilized workin: knowlcdge of them alf so long ago that ous ancestors appear to have been dumbells a' the time. They were living in total ignor ance of a civilization so advanced and st fundamental that even to this day John Chinaman is ahead of us in the applicatio) of many things mechanical he has knowr since Noah built the ark. Here's the parade of a few, taken ir order: Why Holes in Chinese Rudders? Chinese junks have holes in their rudder: to make them steer belter. Just a hundre: years ago we learned that water pressur: in front of a hole through which water Wa: flowing was greater than would be pressun on an equivalent non-open area. Chinesi rudders, full of holes for thousands of vears. are more effective per foot of area thar ours. In the air this phenomenon of fluis: flow has only recently been taken advan- tage of through the use of the slotted win: for aircraft. Lee boards and centerboards are distinct: Iy Chinese in origin. This fact is checkes against history-—as a matter of fact al] ih: asseverations here are a result of research and have been checked against any possible tendency to ascribe the origin of any Ol everything to Old Johnnie Chinaman. The waterwheel, or Noria, was used ir, 1500 B. C. for raising water from one leve: to another, and as far as can be determined was the earliest form of machine to make water lift itself. The Discovery of the Piston The piston was a Chinese method blowing air. James Wall made use of it ix the first steam engine, reversing, as he put it at the time, "the function of the Chines: air pump. The Caines determined equinoxes an: solstices as early as 2300 B. C.; they record- ed the first eclipse in 2130 B. C. and modern astronomers with their mathematics ami years of observation have been able to show that an eclipse really did occur then. His. tory has thus been able to check itse}! through the rhythmic movements of the sun and moon. Printing from clay blocks and wooden tablets was used as early as 50 B. C. This antedates the European invention of Guten- Modern Mechanix ang 8bitD ownload.com

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berg in 1463 A. D. by quite some little span % of time. The Chinese use of instruments resem- bling armillary spheres and quadrants proves that they antedated the alidade of Tycho Brahe by at least three centuries, a navigational elementals before we i . No Iron Age in China Bronze was used about the 5th Century ic C. Funny that the Chinese never passed through an iron age—that phase of world history is really Occidental. But they knew smelting and the primitive reduction of copper bearing ores. Their beautiful china- ware and ceramic work, clay Coe etc., ug expressed in cloisonne work where a vase or dish is put through hundreds of itrings for decorative co ae is well known. The art is reported by Marco Polo after his first trip to the Orient. Use of the loom was known in 1200 B. C. und the same form is used in many Chinese provinces today. The compass as applied to the navigation of ships really had its origin in the Chinese magnetic bar which was used on wagon lrains to give the drivers some sense of general direction in their journeys. Travels of the Compass The Arabs adapted it to desert traveling und it was taken thence to the shores of the Mediterranean. Phoenicians used it in a rough form. Later we find Columbus using n sensitized needle floating in a bowl to show him "whether his ship was standing on her ear or no." The Chinese have been foremost among the early cultural races in their advance- ment of things pertaining to shipping and to the sea. Marco Polo thought the junks of the Chinese very quaint at first sight, but was amazed at the efficiency of a sail held in place by battens. It was so superior to the loosefooted square sail the Romans had handed down in turn from the Vikings, that the real beginning of the fore-and-aft rig began when Polo returned with battened sails to Europe. It is rather fascinating to conjecture on some of these things, to realize that plod- ding John Chinaman, who seems thick and slow and dense to modern Western culture, Should have sought out these truths of nature, these mechanics that we today are using in the iron men of our machine age. And to realize that we haven't vet extracted all of the value from their applications as in some instances John Chinaman has done with his science. Inventions for March

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TERWOEEL C ABOUT PISTON ® EMPLOYED IN AIR PUMPS ABOUT

5i SS O aeee 1 Ts 'BODRERS ~ HAD HOLES IN ! THEM TO FACILITATE STEERING! 2000 B.C.

RR RON RL ne ceases me l uaaa- i DRAW LO USED IN 1200 B.C. > < ae

Out present mechanical age would have been impossible without the fundamental inventions made by John China- man before the Christian era. 85 8bitD ownload.com

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HANDIKINKS Do you know any short-cuts or handikinks which readers of these pages would find valuable? Send your ideas in to the magazine; if they are new and novel you'll receive a check in payment at regular rates. Sewing Machine Replacement Makes Grinder M of foot-powered sewing machines have been discarded or put away in some corner of the attie te make way for up-to-date electrically driven units. Fhe mechanism is usually in good working order and with a few changes can be made a valuable ad- dition to the workshop equipment. Remove ihe flywheel of the sewing machine and replace it with an emery wheel; this gives you an excellent grinder which can also be converted into a polisher by substitution of a bulling wheel. With some additional labor, the needle head of the machine can be converted into a jig-saw. The drawers of the sewing machine make useful ee space for files, reamers, and other small tools. The belt drive of the machine can also be used to drive other pieces of equipment.—Chester Sullivan. Electric Refrigerator Rep Making Glassware Heatproo | l 0o glassware, when subjected to sudden extremes of hot and cold tem- eratures, reacts by cracking to pieces. his is because different sections of the glass expand with varying degrees of rapidity when hot water, for instance, is poured upon it. A special kind of glass known as Pyrex is sold which is immune to heat breakage, but the simple method shown below will accomplish much the same effect. Fill a large pan with cold water and put into it the glassware you wish to immunize against a Place the Bo lassware on the gas range an ring the : . water to a boil. Lat it boil for fifteen ai WHEN the electric refrigerator refuses ti utes. Turn off the heat and let the glassware operate, the trouble may be duce to : cool gradually. This is in effect a process shortage of gas in the liquid line. Thi: of annealing.—Vogel Albinson. usually happens when the suction Hini frosts. If service is unavailable for severa hours, you need not be without the service: of your refrigerator. Simply tilt the refrig:. erator three or four inches from the flow on the end of the compressor opposite the liquid line. If you are not sure which is th: liquid line, tilf in both directions until you get results. If the machine is short of gus it will operate for several days when tilted Safety Guard for Flour Bin SS GLASSWARE INGED flour bins which fall back 0! ees their own weight when the pull is re leased are serious threats to the housewife Glassware fingers. A simple guard can be made from boiled for 15 : . : minutes and 4 Strip of wood with a weight on one end cooled grad- mounted on a nail, off-center, so that wher ually is ım- the bin is ro the weight drops, the enc mune ta : z i breakage Ofthe wood rises and catches on the lip © from heat. the bin holder. 86 Modern Mechanix ane 8bitD ownload.com

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! BLATT N YL e AMUTTING uniform slices of bread is some- thing of a task, particularly if the bread be fresh and soft and the cutting knife not any sharper than the law allows. And even under ideal conditions it takes some skill to cut slices square instead of wedge- shaped. e bread slicer shown above solves the problem handily. Shape a pine board to the dimensions shown and bend the wire to the form indicated. No. 9 galvanized wire is about right, but the kind of wire is not critical as long as it is stiff enough to stand A pine board and a few lengths of stiff wire, shaped and mounted as shown here, make an excellent bread slicer which simplifies the task of cutting bread into uniform, square slices firmly when the ilattened ends are driven into the wooden base. The pair of wire uprights forms a guard between which the knife slides. The loaf is firmly supported at the same time, aided by the long wire side bracket which keeps it square on the board. A shallow groove cut between, the knife guards will assure a cleaner slice. The bread slicer can be painted or stained, but a coat of shellac or varnish is recommend- ed to leave a smooth, impervious surface which can be kept clean.—Tige Harrison. Collapsible Drainboatd for Kitchen Folds Out of Way When Not in Use Inventions for March A DRAINBOARD is a necessity for wash- {A ing dishes, but in the small kitchen it can make considerable of a nuisance of itself by taking up valuable space. The photos at the left show a figurative method of eating your cake and having it too. The drainboard shown is mounted on a rod which slides through two screweyes. When in use, the board is slid over until one end rests on the edge of the sink. After use, it is pushed back and drops down to hang arallel with the wall, occupying practical- y no space. A hook dropped through a sereweye prevents the board being knocked aside when loaded with dishes Children's Teeter-Totter for Outdoor or Indoor Use A about six feet long, mounted on two semi-circular strap iron rockers, as shown in the drawing at the right, makes an excellent teeter-totter for chil- dren which is equally useful in- doors or outdoors. The height of the rockers can be suited to the oo who will use the teeter. races should be used between the rockers.—A H. Waychoff 8bitDownload.com

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DESIGN f CARVE DESIGN tN RUBBER A Loudspeaker Phonograph ERE'S a simple little phonograph which the amateur can assemble, giving a truer reproduction of music than the conventional phonograph be- cause of its utilization of the radio loudspeaker principle. First build the oe box shown, approx- imately 13 inches square and 6 inches high at the rear. The only thing you cannot make yourself is the clock- work which drives the records. This may be purchased or reclaimed from a junked phonograph. made of celluloid or stiff drawing paper. about / inches in diameter and cut out a GO degree segment, rolling into funnel shape. Then the lever, some 6 inches long, is mounted. This is simply a length of light metal rod, weighted at the end with rings to adjust ils pressure on the record. The needle attachment is shown clearly in the draw- me ee ee ee ae A EE The sound funnel is | # 5 Lay out a circle Rubber Stamp From School Eraser N ORDINARY school eraser and a sharp knife or safety razor blade are all tha! are required to make a rubber stamp that will imprint monograms, initials, decor: tive patterns, and the like. Draw the desired design on the erasti with a pencil, bearing in mind that th: units must be reversed, as if you were look. ing into a mirror, so that lettering, etc., wil not read backward. Cut away surplus rub- ber to a depth of about 1/32 inch, remem- bering that the raised sections will print black and the pan you cut away will show white on the finished print. Borders and various repeat patterns can be carried out in a manner similar to block printing. Straight lines are, of course, easier to cut than curves. Designs can be stamped on fabric which is later to be embroidered. In the absence of an ink pad, a blotter moistened with ink may be used, but avoid blots caused by excessive inking. Colored inks often may be used with cilect. aaa L . ; . Y E Arpat Ly i w i W iL e. S ing. The needle should slant downward and slightly toward the center of the record for best reproduction.--Hans Kutschbach. Windowpane House Shows Bird Life HE windowpane bird house is built with its back open, butted up against the win- dowpane so that you can look on at the activities of the songsters in feathering their nest. The drawing shows the best type of house, built from boxboard and covered with a bark roof. A tin hanger of the shape shown will hold the house suspended against the window. Hf your birds show fright at their trans- parent back door, pin up a piece of cardboard on the pane until they grow tame. For bluebird, chickadee, swallow or wren, the entrance to the house should be from 134 to 11: inches wide, and the size of the cavity about 6x5 inches, except for the chickadee, which should be 10x4.—Julha Wolfe. Modern Mechanix and . 8bitD ownload.com

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How to Make Wood Dowels in Quantity OTH hardwood and softwood dowels are used so much that this simple device wil] lind universal use for making them quickly, aiinply and cheaply. Geta 1-1n. square piece of tool steel, have a. series of standard-sized holes drilled along it, then have small holes drilled and tapped into the sides of a few af these (for small set screws), and have this har hardened and tempered. To use, the stock is driven through the holes with a wooden mallet. Square stock is chosen, then Ihe corners planed off to make an octagon, und one end sharpened or pointed so as to enter the hole. By driving it clear through, u long dowel is made of the required size. The set screw makes a groove in the dowel when this is needed to let air and glue escape, and is used only when such a groove is need- ed. For planing the square stock the bench Ixture sega is very helpful to hold the stock tight while ihe corners are planed off. It consists simply of a V-groove adjustable i ee by a wing-nut device.—Morris A. all. Sa Toor Sree STANDARD WT; I SQUARE SIZED HOLES WING NUT Puller for Gib-keys Works Like Hammer p WORKING with machinery itis frequently necessary to pull gib keys, and when these have been driven home with a heavy hammer the job is no easy one. A home made puller built to the dimensions shown at the left pulls % inch keys with comparative ease. The metal loop which fits over the key head is shaped and welded to one end of a metal rod. A round ball or sliding weight which affords a good hand hold is slipped on to the rod and a nut welded on the lower end. Fit the loop over the key; then, striking smartly against the nut wilh the sliding weight, a hammer action is produced which soon loosens the most stubborn key. It is highly important that the nut be well secured to the end of the rod, in order lo survive the strain of constant hammering. Welding is, of course, the ideal method of securing the nut, but it can be screwed tightly on to the rod and the projecting end hammered down like a rivet head.—William Speaker. Tubing Keeps Mist Off Windshield HROUGHOUT the winter months motor- ists are bothered by the formation of mist and ice on the a obscuring vision. Here is a cheap, home-made attachment for doing away with this menace to safety which functions efficiently. A generous length of quarter inch copper tubing is coiled around the exhaust manifold six or eight times at a convenient spot. Its forward end is directly Warm air passing through coils around exhaust manifold blows against windshield. keeping clear of ice. behind the radiator fan, and a small funnel | no ee eee mouth is soldered there. The other end is carried through the floorboards, bracketed | te We to the steering post, and bent to direct its =; [E4 “Reh AN stream of warm air against the windshield, = (0 7t*, re ares Hid keeping it clear of mist. The air flow should be directed upward against the glass. The more coils that are wound around the mani- fold, the warmer will be the air that slrikes the windshield. Inventions for March g9 8bitD ownload.com ees e ae a oe ats Te aaae EPEAN Me sesh D e E T E E E ttii

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RUBBER TRANSMISSION SHAFT GEAR FROM SPRING FROM SHOCK c TRANSMISSION | ABSORBER SPRING e Me = ei foes S RELEASE FROM 2 A l BRAKE LEVER eo REAR_RADIUS EXHAUST MANIFOLD ROD CLAMP Various Model T parts can be identified in this drawing of target trap. It will throw up cr down or to either side. THS target trap is made entirely from old Model T Ford parts. These may be obtained from any junk yard for almost nothing. The main support is made from a brake drum from the transmission. This is fastened to the wood base. Two irans- mission shafts are used as elevators under the front end of the base. These are fas- tened with one bolt each so that the angle the target is thrown can be easily regulated. The arm which throws the target is made from the brake lever, which is fastened to 90 w The two photographs show the target trap WASH rai ‘ : i FHER = a) Fa in sections, and completely assembled. while Sy oe the drawing illustrates the device in action. = i It is constructed in its entirety from old parts of Ford Model T. a transmission shaft which slides down in the housing on the brake drum. The guid- ing arm is made from the rear radius rod which is fastened to the reverse gear which slips down over the housing. A bushing from another old reverse gear holds this gear up in place. The trigper is made from the release from the brake lever. It is connected by a small rod to the exhaust manifold clamp which holds the arm until the release is pressed. A small spring holds the gun cocked. The small brackets holding the main spring and the release are body braces taken from the chassis of an old model T. The mainspring was taken froma shock absorber made for Fords. Any suitable spring could be used. The distance the target will be thrown can be regulated by adjusting the winged nut on the spring holder. The throwing hand is most important. This may be pur- chased, but the one shown was cut from a transmission cover with a hacksaw. The drawing shows the right shape. The adjust- ing nut regulates the point at which the hand throws the target. After it is finished it should be adjusted so that the target leaves in a direct line with the guiding arm. This trap will throw up or down, or either side by just moving the guiding arm. Modern Mechanix and 8bitD ownload.com

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A Range Finder for a Kodak Ar finder that takes all the guess work out of estimating distance can be made from scraps in a short time. The base is a hardwood strip, % by % by 61% in., scaled with 4% in. divisions. Two other parts, an eye piece and a rider, are also of % t2 in. hardwood, pierced with % in. holes and slotted to fit over the scale, The a piece is glued solidly at the zero end of the base. Over the hole is cemented a celluloid window cut from an old nega- tive, which is pierced in the center with a 1/32 in. (or smaller) hole. The rider has a window with a % in, hole, and is slotted 1/16in. deeper than the eye piece, providing for a horizontal block which, resting on top of the scale, holds the rider upright. A 6 in. strip of wood, painted black on one side, is provided to sight on. When using the range finder, rest the strip against the subject and sight it through both holes, the eye piece being even with the camera lens. Slide the rider until the strip spans half the hole, and read the result in feet on the scale.—-Edwin M Love. - = n k À ~ 3 z tj {d | 1 | | DISTANCE Using the range finder to gauge distance for focusir'£- Picture of Flooded Valley Faked With Print Reflection in Pan of Water ttt PHOTO OF ttt VALLEY, ils Ñ BOX LINED | WITH WHITE; j} - Sy OL CLOTH | 53 A ý Tọ show bow a yafiey xg appear after flooding ha print of the area wa er as shown and the reflection photographed. Inventions for Marck A photographer was recent! called on to show an actual photograph of a huge valley, now existing, as it would appear after engineers had changed it into a reservoir containing water to a depth ot over 400 feet. This at first seemed an im- pees eee Ee hic feat, but was clever- y solved in the following manner. A oo view was photographed of thet beautiful valley, showing the existing farms, streams, etc., just as they exist. A print was made of double weight paper which was then prepared on both sides with a coating of white varnish to protect it from moisture. The print was then tacked flat on a thin board. ; Next a water container was lined wilh white oilcloth and the print immersed in water vertically, until a level was reached on the picture showing the water level as. it would appear when the valley was flood- ed. With proper lighting from each side lo overcome shadows, the picture was photo graphed on a second negative. This wits then blocked out around the edges to cul put all views of the water pan. The resull ing print showed just the range of hills pro jecting from what appeared a lake surface with the reflection of the distant woods and shoreline in the far side of the lake Speeding Up Film Washing A rectangular wooden frame, between whose ends one or two rolls of film can be suspended and floated on the surface of water which fills the bathtub to the over flow drain, makes an excellent washing device fie; film which yeagunes practicall no attention. 9| 8bitD ownload.com

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Moist air feed installed in Model A Ford. Note water intake from radiator hose. Water is turned to steam by exhaust heat. OIST air has long been known to aid in smooth operation of gasoline engines. Obviously it is impossible to have rain- storms made to order, but with the device illustrated here you can, in effect, create ideal shower conditions inside your motor. This moist air feed utilizes the exhaust heat to turn the water into steam before feeding it into the motor. The control is entirely automatic, the valve opening only when the throttle is opened, feeding water in proportion to the speed driven. Although the original outfit was placed on a Model A Ford, it can be adapted with aon alterations to any make of car. he photograph shows the general instal- lation. Water is taken from the upper tank of the radiator through the connection shown in detail in the drawing. It should be placed high enough above the upper radiator hose so that no more than two quarts of water can be drained from the tank. This prevents overheating by limit- ing the amount of water that can be "stolen" from the engine. Study the drawing of the control valve. This is adjustable so that a quarter turn of the needle causes a free drip of water. Roll a three-inch length of fine mesh copper screen and force it into the 5/16-inch cop- per tube next to the control valve to give BRASS FITTINGS re OMEN DEPT a ee f pane a A > : bso > Sa ity > s 7 x R SSS oe ASS SST | Ae RSs teed OY À 4A BDE T á i 4 2 4° PIPE TEE "VARA Brass a M : 4 || SHEET EXHAUST JEH Sg COPPER BRASS MANIFOLD He — TUBE eee 3" ROLL OF FINE MESH contoh ENE MESH G2 EXHAUST MANIFOLD A he ™E WATER INLET TO THROTTLE \ +h PEDAL b e i ` EXHAUST 4 T e i CARBURETOR Iĝ; EE DTAKE ONS END =} ~A e SQUEEZED iene TOGETHER Va" x Te" NIPPLE icy etal Parts of moist air feed are shown in drawings. Note that control valve is completely closed when throttle is retarded. an even flow of water io the tube in the exhaust chamber. The copper tube from the exhaust to the carburetor intake is fastened by means of a sheet metal clamp. The inside of the tube over the intake is slit with a hacksaw the entire distance of the intake opening, and the bottom of the tube squeezed shui. Method of fastening control arm to throttle arm is shown in the drawings. The heavy wire connecting rod is made just the oe length to keep the water valve closed when the throttle is entirely retarded Sign on Front Bumper Combines Warning With Advertising Message Nee front bumper of a delivery truck offers ingenious fue tr “Careful! MOVE J-ACME TRANSFER! 92 advertising opportunities which are rarely made : use of. Lettering can be placed on it ostensibly playing up the safety first angle, tied up with the company's name so unobtrusively that the observer scarcely re- alizes he is reading advertising. tions pertinent to particular businesses will occur. Star Laundry” not only carries a warning message, but implies that the laundry itself is careful. Other suggestions might include: "Watch Your Step! Jones Shoe Co."; f Smart! Brown Clothing Store," ete.—V. E. Barnes. Innumerable sugges- "Watch Out! Gem Jewelers": "Look Modern Mechanix and 8bitD ownload.com

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Shelving May Be Hung From Picture Moulding Without Marring Walls CCASIONALLY there is a need for tem- So porary shelving in some room, as when = a Boe ea an unusual number of diners are being A ANCES f served and a piace is needed to store dishes. The expedient of hanging temporary shelves as shown at the right is helpful. Ordinary Ee hangers support strong wires which old up the shelving. With this method it is entirely unnecessary to mar the wall plaster or scar the moulding, and when the shelves are removed there is no evidence that they have ever been there. If wires of a tone to match the plaster or wall paper are chosen, they will be practically invisible at a slight k distance and the shelves will appear built ill. into the wall. — V. E. Barnes. fiih. “Elevator Shelf? Makes Inaccessible High Cupboard More Convenient PuL S Sa H "MHERE are two cupboards in every modern home that a a ae L are almost useless, except for dead storage, because of po t their inaccessibility. They are the two located above the J kitchen sink, as shown in the drawing at the left, or above the built-in kitchen cabinet. They are so far out of reach that the average housewife climbs a ladder, puts some- ihing away, and then forgets it for a year or two. solid shelf, boxed on three sides, to fit into the cupboard. can be fitted with a sash weight sliding over pulleys as shown. When wanted, the sheif is simply pulled down by means of a hook engaged in a sereweye in the bottom. Of course, the permanent lower shelf of the cupboard must be removed so that the elevator unit can be slipped into place out of sight. A sufficiently heavy sash weigh! should be used. — H.C. Thomas. MOULD ING x. è 7 HE simple clothesline tightener shown at the right is made from two pieces of 1x2 white pine, two |) pieces of strap iron, and a small spring. The principle involved is obvious at a glanec, leverage being brought into play by the weight of the line to grip the loose end firmly. The more clothes hung on the line, the tighter the rope is gripped. The spring is used merely to keep the two wooden pieces Suppe the rope when there is no tension on the line, and it need not be strong for this purpose. The completed unit is screwed to the upright post.—C. H. Williams. Amusing A Children Made From Box and Scraps of Wood URS of amusement will be afforded children by the hand-oper- EL ated rocker shown at the left. It is constructed from a wooden box, large enough to accommodate a youthful occupant comfortably, to whose sides are nailed wooden rockers cut from pieces of hard- wood. Then add the paddle-like handles, which swing on a broom- stick or pipe axle. A crude but entertaining form of PIPE ON BROOMSTICK locomotion results from rocking and manipulating the handles.—D. H. Butler. m= | To Adjust the Gas Range Flame Ë 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. A Gas burners should burn with a clean greenish-blue ROCKER flame. If they burn yellow, open the air shutter just back of the gas cock slightly. t faa i ir n pray 4) Inventions for March 8bitD ownload.com 93

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C-clamps Make an Adjustable Beveling Guide for Plane Clamps on plane act as guide for bevel cuts as shown here. IFFICULTY is often experienced in beveling a piece of wood when only a certain amount of material must be re- moved. The bevel is usually either uneven or at the wrong angle. By using a guide that allows the plane to cut only at 45 degrees and allows only the desired amount of ma- terial to be removed, such a difficulty may be remedied. A suitable and efficient guide for such work may be made from a pair of medium sized C-clamps by tightening them on the plane in the method shown in the photo- graph. By trial place the clamps at such a distance apart that they permit only the re- quired amount of material to be removed. Tighten them on the sides of the plane so ihat it may be run along the wood at the best cutting angle. The result will be a per- fect 45 degree bevel of the exact width de- sired. The photo at the left shows how the clamps are applied, while the drawing illus- tratcs the cuts. Develop Marksmanship and Make Extra Cash With Unique Arrow Gun HERE'S a lot of fun to be had in banging around with a little gun like this, and a lot of profit to be gained from making them in wholesale lots to sell in your neighbor- hood. The gun is cut from a board 4 in. wide and 4% in. thick, and shaped as illustrated in the drawing below. The next step is to bore a hole for the trigger. This latter part iS a narrow Strip of rather heavy sheet iron about 3/16 in. wide and of suitable length, with a hole punched in one end slightly larger than the balloon stick which is used for the arrow. The hole must be punched smooth so the arrow wil] slide through easily. The strip is then screwed to the handle, and the end with the hole inserted through ` re ooo ee ; J14" DEEP the slot in the gun and so adjusted that the hole is just slightly above the bottom of the groove. When an arrow is thrust into this, slight pressure on the trigger will pull ihe free end down and lock the arrow in place. Releasing the trigger will permit the hole to rise slightly, freeing the arrow for a flight into space. Here’s the completed gun and _ projectile ready to go into action for target firing. OT 4" WIDE Arrow is here seen in gun ready to be released. All the parts necessary for construction are shown in the drawing. 94 Modern Mechanix and 8bitD ownload.com

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Build This Handy Bathroom “Door (Closet The artist’s drawing above 1)- lustrates the closet in use. Note particularly how the footrest ts lowered for shining shoes. The closet can fit flush with the wall and make an unnoticeable but handy addition 10 the bathroom or kitchen. All dimensions are given in the drawing at the right. You don't have to fol- low them to the Jetter, but you will find them about the best. Note also the closed position of the shoeshine stand. Best disposition of all the materials is shown in the drawing, but suit yourself. A to keep miscellaneous articles which form an indispensable part of the equipment of every household often pre- sents the housewife with a problem, but this easily built door closet promptly solves it. By keeping a supply of guest towels hang- ing in this closet, they can quickly be ex- changed for your own towels when the visi- tors arrive. If also provides a shelf for large bottles which the average medicine chest will not take. Two more chests of varying heights hold surplus medicine bottles. The amazing capacity of the cabi- net is well illustrated in the drawing, which March MENGE SHOE SHINING 4“ STAND CPENED Inventions for _ SHELF BRACE 0 PFACE TISSUE roweus, T: | TSHOE SHINING ` a — i 7 Lat ; a T gi- o. a k RWHITE CLEANS TS. ‘ice 2)fER AND BRUSHPIT™ iit. ge mo ay b LIPE meo ma rad a bee det det “4 + f= 7% 30 To 12°4 BRACE ~ | | HOT WATEA BOTTLE - FOUNTAIN SYRINGE- Í | 4" ! £ / . ; . ET. } also gives all the dimensions you will need for construction. A feature of the chest is the shoe shining Stand, which consists of two boards, % in. by 0 in. by | ft. 0in. long. They are attached to the back of the closet with the aid of two blocks as illustrated. The board used as a footrest is hinged to the bottom block. A few coats of white enamel will do for the paint job. 95 8bitD ownload.com

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GALX-UP STUNTS for the SHome Readers who have hit upon simple, time-saving methods of repairing the thousand and one items of household equipment are invited to send in their ideas to the magazine. Those used will be purchased at regular rates. Upper half of photo shows loose chair rungs; lower half, tourniquet clamp which holds parts in place while glue dries Tapping ın on Line Frequently one wishes to tap in on an electric circuit to install an extra light bulb, or similar purpose. This can be done without cutting the wires, as indicated in the an below. Simply unbraid the wire at the point where you wish to make the connection, and mount a porcelain base. Scrape off insulation to make contact. Note how connection is made—two wires spread apart and insulation scraped away where contact is made with screws. 96 Regluing Loose Rungs in Furniture Loose joints in glued furniture can usual- ly be sprung far enough to enable anyone to scrape away old glue and apply any quick-drying glue, plastic wood cement or amberoid. Use vinegar and a small brush for remov- ing old glue. Wipe with a cloth soaked in warm water to remove surplus new glue. Clamp or bind glued parts together till glue 1s set. Chairs and other pieces of furniture are often awkwardly ened for the use of clamps, A simple tourniquet arrangement such as shown in the photographs at the left is then advised. Twisting the stick provides ample pressure to hold the freshly glued joints together. The end of the lever can be tied to one of the rungs. Electric Iron Repair Burnt out ey elements of an electric iron may be quickly repaired by use of a small brass clip, as illustrated below. If the break occurs at the edge of the element the clip should be clamped over the edge to shunt out the broken section. If disconnec- tion occurs between edges, set the clamp on the surface as illustrated. The ends of the ribbon should al.ways be cleaned before the clips are applied. e is Li ii APPLE A ALLA kidd hb hhh hhh, ZA CCS ea LE LL MLL tea De es ee Pe ee dead be Lh beh he etdh ED ee Peeled Aai aii aiid Ta ET SFP: i 7 KALA Y om. why J Q la drr CL fd Lieb G ULALA LLL AMAA LLL LLL ELE LLL LLL he bch hitb hidishigiiae AITITA eTA n bed adaa Aa kids le K OD A bel kkk For repair, clamp the brass clips in positions shown above. Alarm Clock Furnace Opener By arranging weights so that they will open or close your furnace when released, an alarm clock can be installed which will release the apparatus, thus serving some of the practical purposes of a thermostat. The trigger should be attached to the key of the alarm wind so that it is tripped when the alarm goes off and the key starts turning. This arrangement saves running down to the furnace in early morning hours of bitter winter days. Modern Mechanix and AA IRON ELEMENT——*” 8bitD ownload.com

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Replacement of Faucet Washers Saves on Your Water Bills The most common type of compression faucet ts shown in the circle at left. To re- place the washer, the cap as- sembly is unscrewed and the units removed. A new leather or fiber washer can be screwed in place in less than a minute. At right, the same type of faucetina slightly dif- ferent assem- bly. REPLACEABLE ee ala REPLACEABLE WASHER fE REPLACEABLE A {A f Eo ni Aa At left above, a self-closing type of faucet actuated by a spring mechanism, showing location of washer. Right above, phowing the ease with which a modern type of bathroom faucet can be disassembled for replacement of worn washers. OTHING is more annoying than a leak- ing faucet whose drip, drip, drip is a constant reminder of money being wasted Making a Lawn Seat Portable Y adding a wheel and handles to the on water bills. The repair of such a faucet is one of the simplest tasks of the home plumber and there is no excuse for en- during this petty annoyance. The most common type of faucet is the compression faucet shown above. Practi- a al] faucet repairs involve simply the replacing of a leather, fiber, or rubber washer that has become worn. First the water supply is shut off at the basement, or in lieu of this all other faucets turned on to reduce the pressure. Then the cap is unscrewed, the assembly removed, and the worn washer taken out by loosening the screw in its center which holds it. To replace, reverse the above routine. ashers can be bought cheaply at the ten cent store or at your hardware, or in an emergency they can be cut by hand from suitable material. Jt is surprising the way water bills can be reduced if these simple faucet repair methods arc adopted. It's a self-liquidating proposition! Inveations for March lawn seat, as shown in photo below, ihis article of furniture can be made easily port- able, and the design has a pleasingly mod- ernistic touch. It's a good winter work- shop project, to have completed and ready for use when springtime rolls around. This "wheelbarrow" garden seat is portable and attractive. 97 8bitD ownload.com

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How to Hook Up Electric Plug So Wires Won’t Pull Out WRONG Note that right way to connect wires 1s to wind them around lug before binding to screw; this supports against stratns and prevents wires from being pulled out. Patching Plaster Patching plaster can now he purchased at most paint and hardware stores. It comes ready to mix, two parts of plaster to one of sand, with water until it is as stiff as can be worked. Old plaster should he carefully removed before patching. All plaster which gives when pressed with the hand should he taken oif with a putty knife or pointed trowel, Wet the edges of the old plaster and the laths and, with a trowel, press on patching plaster, filling the break to within an eighth of an inch of the surface. If a good sized surface is replastered, drive common nails through the new plas- ter into studding with heads we] sunk into the plaster. Allow this coat to dry, then scratch the surface with a screw driver and mix a finishing coat of plaster and water to about the same consistency (without the sand) and trowel on smoothly. 98 One of the commonest repairs which the home electrician is called upon to effect is replacing wires which have pulled out of their connecting socket. The two views at the left show the right and wrong methods of going about this simple task. The wrong way is to attach the wires directly to the binding screws, as shown in the top photo. Repeated strains on the wires eventuall pull them Joose when this hook-up is used. resulting in loose connections, short cir- cuits, and occasionally dangerous fires. The right method is to wind the wire around the base of the two projecting lugs, keeping the insulation on where contact is made with the lugs, HEATING PLANT HINTS Salt Your Fire A handful of common salt thrown on hot coals of the fire will help keep the furnace clean. Generous salting each week is ad- vised. Every month toss in a small sheet of zinc or an Old doorbell battery. The zinc fumes combine with furnace gases to re- move scale, cleaning out the system. Watch Expansion Tank Be sure there is plenty of water in your hot water plant if you are using that type of furnace. Most such furnaces are fitted with an extension tank located in some up- stairs closet. A glass gauge on this tank reveals when the tank is well filled. If water is low in this tank, hunt for the water valve on the furnace and let in water till the tank gauge shows half full. Repairing Insulation Asbestos cement may be purchased at any hardware store for the purpose of patching or repairing insulation on furnace or pipes. Cold Radiators If one or more radiators of your hot water heating plant remain cold when a good fire is burning, hunt up the radiator key. It’s usually in the bathroom medicine closet. Hold a cup under the end valve of the radiator, insert the key, turn to the left until air hisses from the radiator. When water spurts out, tighten the valve by turn- ing the key to the right. If any radiator is still chronically cold, follow its pipe circuit to find faulty insula- tion or add more insulation if the pipe runs too near an outside wall. Such a radiator is likely to freeze and burst in extreme weather if not attended to. Clean the Water Heater The gas heater furnishing hot water sup- ply in most houses requires attention every few months to maintain its efficiency. The burner should he taken out and boiled in a solution of sal soda. Dust and dirt should then be scraped from the cop- per coil and from the casing. Modern, MechaniX and 8bitD ownload.com

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Correcting Leaky Flush Tanks Is Easy If You Know How LUSH tanks of the toilet are frequent Causes of trouble, usually in the way of leaks which, like loose faucets, can dribble way a surprising amount of money in the form of unnecessary water bills. The accompanying photograph shows the operating mechanism of the conven- tional flush tank. The eee gee is simple. The hollow float is mounted on the end of a rod. When the water is flushed out, he float sinks and the rod pulls open the ntake valve which permits water to flow n into the tank. The rising water lifts the float, thus closing the valve when the proper level is reached. The flush valve is usually in the form f a rubber ball, which fits into a flared ip. In time this ball hardens so that it does not seat tightly, permitting a thin stream of water to trickle past it constant- ly. If this is the case, replace the ball with e new one, which can be purchased for e few cents. It does not pay to try to re- condition an old one. Perhaps the ball does not drop into cor- rect position when the toilet is flushed, but lands offside. Check the alignment of parts to make sure that the arm which guides the ball is correctly centered. A ee screw adjustment will align prop- erly. Another source of tank leaks is oc- ¢asioned by failure of the float to rise ee enough in the water to shut off the intake Valve before the level rises to the top of the overflow pipe. If the float rod is bent downward, the lloat will rest farther to- ward the bottom of the tank, and conse- quently will raise the rod to a greater de- ee when the water flows in, shutting off e intake valve as it should. If none of these remedies stops the leak, check over all parts carefully to discover defective pieces. Washers in the valve sys- tem may have become worn; pipes may be corroded or threads eaten away. Solder- ing will frequently effect a permanent re- air. In other instances replacement may e necessary. Tightening Loose Handles Don't throw away old screwdriver shanks when the handle splits from too many blows with a hammer. Turn out new handles, leaving a generous hole into which can be poured a mixture of hot sulphur (melted) with equal parts of rosin and old iron meet This will anchor the tangs perma- nently. A similar repair method can be used on kitchen knives and forks which have be- come loosened, as often happens with bone or composition handles. Su phur is hard enough to be used as a base for heavy ma- chinery, and this repair method is perma- nent. tf a surplus of adhesive is used, the overflow should be scraped away before it hardens. Inventions for March Operating parts of flush tank arc shown in cutaway photo. Repair of various parts is explained in accompanying text. Fixing Loose Screws VERY household is familiar with the annoyance pictured in the photo below, in which the screw holding a soap dish to the wall is no longer able to perform its function because the wood and plaster in which it sets have crumbled away. The simplest remedy is to remove the screw, clean out the hole and fill with plas- tic wood, leveled off flush with the surface of the wall. Permit it to dry thoroughly. The screw can now be remounted and will hold firmly in the new surface. Another method which can be used if no plastic wood is available is that of driv- ing a wooden plug into the chewed-up hole lo a tight tit. Either of these repairs make it unnecessary to move to a new position. When plastering becomes crumbled so that screws no longer hold, hole can be filled with plastic wood to give * new grip. 99 8bitD ownload.com

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SQUEEGEE ‘Plate Makes Distorted Photos At left, photo Co by ulging plate upward in mid- dle; above, by wedging top right corner of chromium plate closer to sub- ject. Camera should be placed a foot from plate, pointing toward center at a slight angle. Person or object to be photographed is placed several feet from plate. Effect can be seen by placing eye directly in front of camera lens. OUR thumb tacks and a chromium squeegee plate will enable you to take the most weird "comic Valentine" por- traits you ever saw. The e of curved mirrors in taking distorted photo- graphs have long been known, but these mirrors are unobtainable in small sizes. Any photographic supply house will sell you a highly polished chromium squeegee plate, which serves as well as a mirror, for around a dollar. Fasten the plate by means of thumb lacks to a flat wooden surfaee, such as a door. The camera (any type will do) should 100 8bitD ownload l Believe it or not, the demon above is a gentleman of normally pleasant appearance. Surprising distortions can be obtained by alterations in the curvature of squeegee plate. be set about a foot from the plate, pointing at the center from a slight angle. The per- son to be o ean is placed several feet from the plate in such a position that the reflected image can be seen in the plate when the eye is placed directly in front of the camera lens. The next step is to produce the desired degree of distortion by wedging up the edge of the plate at one or more places. You will be amazed by the queer and interesting dis- tortions produced by the slightest change in the curvature of the plate. There are just two rules you must observe in taking distorted pictures by this method. The first is to increase the normal exposure ordinarily correct for the light and subjeci by at least fifty per cent. The second is to use a small stop in the lens, the smaller the better. If you use a large diaphragm open- ing, you will get nothing but a jumble of light and dark areas. The focusing is not at all critical and the enforced use of a small stop will cover up any errors. In measuring the focusing distance, the sum of the distance of the camera from the late, and the subject from the plate, should e taken. Modern Mechanix anda O Q = we

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WINTER USES for E€LECTRICGANS At left--To warm up an office quickly, set an electric fan to blow against radiator at an angle, setting up swift circulation of warm air. Even if fan is mounted perma- nently on wall, heat wilt be distributed a mote quickly by starting up the fan. At we right, use of fan to blow against store windows from inside to keep off frost and’ ice so window-shoppers can see display. Het air furnaces Use of ¢ fan to long ducts improve draft more rap- through furnace Y if fan is fire-pot is shown up to here. The fan is register, as placed in front of wn. to start the open ash-pit @eeulation of a door. Improves mm “ir. o heating capacity of furnace. Wool or felt strips, suspend* ed in front of fan, their ends resting in pan of water, make an excellent humidifier to re- move dry ness from the air. = r eae ae aay oe Ae r j RARE RA Pig ang ni A a sit eatin CU te At left, a drying hot-air blast for use after shampoos, etc., can be made by attaching fan to toaster or other heat- ing element with a metal hood. The hood is optional. At right, unusual use of electric fan in preventing dangerous ©. snow and ice formations on steps dur- tte a, ing light snowfalls. eal a: At @ ventilator for the itchen, the electric em removes objec- theonable cooking Another popular method of mounting the fan as a ventila- edors. At right, one A d (ae ‘ i a . = l . . method of mounting, tor is to place it in a wooden frame which with a hinged door E — can be mounted eara aH operat- E = ofo > above sash of win- Hy y pull-string. be OUTDOORS dow when it is partly á ast directed to out- l e open. Easily remov- oors. a able when not in use. BR a Se eae WHEEL ao OL | ee oad Motors used for driving electric fans have ee EE e e many uses. Blades are removed and small te pulleys can be inserted on shaft for driv- fe yee ing; also buffing wheels for polishing silver ale ae and emery wheels for sharpening can be 4. ay | placed. At right, drying of clothing in- pane +4 ed now, amen et e a € y i a s . š iia ad PAS side house in stormy weather is speeded Up by directing blast from electric fan at them, hanging on line. This is the drying method, on a larger scale, used by design- ers of modern laundry equipment. Why let your electric fan hibernate for the winter? These suggested uses will add considerably to household comfort. Inventions for March 101 8bitD ownload.com

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“ Penguinette’—a TOWER A little washing machine motor can be belted down by Delta belting to a large propeller and be made to furnish enough wind to pull an airplane type car. This article tells how it's done. ENGUINETTE is a three wheel airplane type midget car built out of odds and ends. It has—or shall we say "she" has? —an airplane propeller, tractor type, belt- ed to a little gas engine up in her snoot. She steers with her third rear wheel just the same way an airplane does when it taxies over the tarmac. All her controls are airplane type so that by constant driving one can get the ground feel of an airplane. In winter lime you can substitute run- ners for the wheels and have yourself a T little ice sled. Quite a versatile lady, eh? Air drive cars ee to many. After much thought on the subject, which in- cluded inspection of a number of these wind wagons, I decided there was some- PERSPECTIVE OF COMPLETED CAR 9 ie pat DETAIL i TOP GRAIN DIRECTION Layout of the parts of the Puffmobile are clearly shown above. Right, stern Dost construction. made of tube with a welded collar. 102 t PIPE BEARING FOR RUDDER POST thing to the idea after all in spite of the holes that could be picked in the mechani- cal and the aerodynamical side. And why not get real airplane flavor into the thing? After all the main reason for driving a set of wheels by airplane propeller is to give grounded kiwis all of the thrills without any of the usual hazards. We've gone as far as pos- sible along this line with Penguinette. In fact her prop can be shrouded j so that vou won't be batting any of the local dogs out of fF 4-4 DIAM. BY 2/6”"P PROPELLER KICK STARTER aR et LS a ERROS SSS SS = cS 34, X 6 BOLT The axle bearings for the built-up type wheels are Motive power furnished by washing machine motor. 3X4 BOLT >o Modern Mechanix and 8bitD ownload.com

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p PUFFMOB ILE a * anneal ARMER ihe way, or getting hamburgered yourself, and in making her tread wide we have fol- lowed out the safety plea, killing two birds at once; wide tread prevents tipovers, and wide tread (in relation to length) gives airplane quickness of handling. A ground loop is perfectly possible with Penguinette. You'll have to be a pretty fair ground flier to run her. Let's departmentalize our design, and build her as we discuss the pros and cons of each element. Chassis Everything nowadays, to stand a chance of getting built, has to be simple. That was our first requirement. So we doped out the simplest kind of chassis. Merely a three cornered frame, somewhat like an ice boat, with cross deck- re SHOCK CORDO 2 This is how the wheels forward are sprung. The U bolt acts as a trunnion. There is a guide hole. AXLE DETAIL Inventions for March 1S WRAPPED n i D. K o HERE" 4 TORNS 000 y ole" RUBBER: > ooon ing of half inch spruce. The average fuse- lage width on the light airplanes we have seen is about 22 inches. The average length of fuselage is 24% times the tread of landing gear on an airplane. These facts, since we wanted our puffmobile to handle like a ship, determined our proportions. The result is shown in the design draw- ing accompanying this article. Being dimensioned and labeled, this drawing is fully explanatory, and nothing regardin the making of the chassis needs to be added. The 1%” by 3" spruce longerons are joined with carriage bolts at the ends and across the axle beam. The seat is of simple short wooden pieces, nailed with 6 D nails. Like- wise the cross boards are nailed with 6 D nails, and sawed flush with the longerons. Wheel Suspension The next element P uP for consid- eration is the matter of wheels. This, for most car builders, is a sore subject. Some can get small bicycle wheels, others baby carriage wheels, others can find an easy way out by making the type of wheel shown here. Such a wheel is made of three lay- ers of half inch white pine glued with the layers running crosswise in grain. We built up wheels of oak in single thickness when experimenting with this car, but they failed on side loads. Having available a de luxe set of alu- minum wheels we impressed them for yeoman duty while making tests and , taking pictures, and they work very well. We use the same collars which were made for the single rain wooden’ wheels. hese collars are of %4%” by 4" shelby steel tubing from an old airplane Left shows how wire netting is run on a tubu- lar welded frame to keep stray dogs and care- less people from getting hamburgered. The engine has a kick starter so access to the prop isn't necessary. Shot below shows steering post. 103 8bitD ownload.com

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Simplicity Marks Layout of Pujmobile; Is Easy to Build and Inexpensive DRIVER JACKSHAFT [f AND DELTA PULLEY AT LEAST 14° NO.!4 PIANO WIRE 1344 X 2 FRAME Above, major di- mensions for car. The stand is of welded strap con- struction and the propeller shaft turns in die cast saw mandrels as sold by all hardware firms for home circular saw construction. Right shows the way the net is in- stalled for safety's sake. Engine has a kick starter. fuselage, with small flanges welded on, about 12” through, to which screws could be fastened. Since taking the pictures we have completed one two ply wheel and two three ply wheels. Both are working very nicely and serve the p. rpose well. The rims are covered with double layers of old inner tube artfully feather edged at the splices and tacked down with box nails along the edges of the rim. Through these the collars are fastened. All easily procurable small wheels of between 12 and 16 inches diameter have one fault in common. The axle holes are seldom more than *&” in diameter if indeed they are that large. And the hubs are narrow. These two things mean that bearing friction of the wheels robs the proposed car of almost all its power and pep. he same thing is true of the kind of wheels taken from the common or garden variety of boys’ coaster wagon. How to get around this objection? By using wheels of decent diameter and by seeing that the bearings are at least 4" 104 y Z i a ——— jf Gece i par a SSE poe —s ee hee ek te hd pa MAAA N Vo H.P ENGINE t750 new \ anina Math al ash Baa ck AM Sh he tale he CT eT The engine is mounted 20" below the center of the jack shaft and the stub shaft on the engine is equipped with a Delta V drive countershaft pulley. The jackshaft is equipped with an 8" V drive Delta pulley. The most effective drive ratio is 2 to 1. long, and 42” diameter or over, at that ade- quate provision for oil is given. It is almost too much for an old timer like me to expect that readers will heed this advice and follow out pretty substantially (Continued on page 139) Modern Mechanix and 8bitD ownload.com

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Junkyard Parts Make This Efficient Workshop Spray Gun MNHERE’S nothing quite so serviceable A around a workshop or a as a spra gun for doing op paint jobs. This one will win a warm place in the heart of any workbench fan, one of the reasons being that it can be built from old stray parts that can be picked up in any junkyard. All construction details are to be found in the drawing at the right. The Zerk lubricating tips shown have to be disem- boweled; that is, the spring and ball have to be removed from the innards, after which they make wonderful atomizer tips. It is advisable to use a quart jar, as the gun will spray out about a quart of paint in seven minutes, when air at 60 pounds pressure is applied. It handles exception- any heavy paint for an air gun. he reinforcing plates mentioned are circular brass 1/16 in. thick. As for the lengths of the pipes, they had best be cut according to the length of the pipe; that is, get the jar first, then cut the pipe to fit. The suction pipe going down into the pipe must clear the bottom by at least an eighth of an inch. Notice that a pair of clamp plates hold the two pipes with the Zerk tips together. It is advisable to put a little paint in the jar and adjust the a to the proper rela- tion to each other before soldering the clamps in position. When the gun is in operation it will be found that it often clogs, but this may be remedied by placing the thumb and fore- finger over the tips in such a manner that the air is blown back into the jar. Insert the bushing in the alarm bell hole and solder in place as shown. Note how chain is held in hole in alarm key. Inventions for March lg" STEAM VALVE a" PIPE — la" COUPLING CONNECTION ee Ces {oF uea > ALIGNMENT OF TIPS =" CLAMP SERK TIP = PLATES FILL WITH SOLDER REINFORCING PLATES LOCK NUT "Sia Assemble the parts for the spray gun as illustrated here. The Zerk tips should be adjusted to their proper position, then the clamps should be bolted together and the space between filled with solder. Suction pipe should clear bot- tom by at least one-eighth inch for the best results. -| Make Alarm Clock Turn on Electric Heater, Lights G any particular electrical switch you want turned on in the morning before you get up? If so, here's the way to work over your alarm clock to make it operate the switch for you. First remove the alarm from in Big Ben. Where the bell was you will find a hole about a half inch in diameter. Now into this hole insert a bushing of the type used in electrical fixtures. Your electrical dealer will supply you with this part. On the side of this bü hin ou should bore a hole for the exit of the power wires. Your next job now is to screw the socket into this bushing, the results of which act are shown in the accompanying photo. The chain hanging down is shortened somewhat, and inserted in the hole in the alarm key. The electrical apparatus is then hooked to the wire coming out of the plug, while the power source is hooked to the wire passing through the bushing. With this arrangement, when the alarm a off and the key turns, the chain will e pulled, turning on the current. You can set the alarm for any time you wish, of course. Make sure you use a sturdy pull- chain socket as it has to stand heavy pun- ishment. 105 8bitD ownload.com

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Adjustable Mirror for Workbench Throws Light on Work GROOVED TO FIT SPIKE Detailed dimensions for all parts are shown in the drawings above. The mirror reflects light on the work as shown. SQUARE reveals little when used on the edge of a board in a vise, if the vise end of the bench faces a dark corner. An adjustable tin mirror screwed to the bench Where it can be turned to reflect light from a window or door along the board is a great convenience in such cases. It can also be used to throw more light for lay- ing out or carving. Shaping Parts for the Mirror In making the gadget shape a jointed arm of 1-in. stuif about 2 in. wide, as illus- trated in the accompanying drawing. Cut a %-in. notch in Sach end, and round the projections to a radius of half the thickness of the stock. A hinge piece, with a tenon rounded on the end to fit the mor- tise, is made to screw against the bench end; and a similar longer piece mounts the mirror. Assemble the three pieces, drill the bolt holes, and reassemble. To permit the arm to be raised to an angle of 45 degrees, notch the hinge and arm where they touch. The mirror is a piece of thin plywood with a piece of tin tacked on one side. Bend a spike at right angles for a pivot, attaching it with staples or screws. Making Pivot for Mirror Cut a shallow groove in the mount to take the pivot, and screw to its back a grooved block of the same size. Tighten the bolts until they will hold the mirror in any position they are put. When not in use, fold the mirror down toward the floor. You'll find it advisable to rub the mir- ror up to a high polish oceasionally. This will make for a better reflection of light along the edge on which you're working. A can of metal polish with a good raq should be kept handy at all times for the polishing process. The photo at the left gives a clear idea as to how the mirror acts in operation. In case there is no window to reflect the light, a 60-watt lamp will do the job fairly well. D.P.D.T. Switch for Electrical Experimenters Made From Spool, Screws ANY is the time the young electrical experimenter wishes for a D.P.D.T. switch by which a source of electrical energy can be switched directly from one piece of apparatus to another. Here is iust the thing for the job. First consult the drawing shown at the right. The baseboard is four inches square, and the screws are set in a circle 3 inches sguare. File out the slots in the holt heads so the heavy wire provided will lie nicely in them. The switch is made from a spool sawed in half. Through the smaller position is run two stiff copper wires and a small brad. This latter part takes a rubber band which gives the switch elasticity. Wire the switch up according to your needs. A hookup for switching the power from One instrument to another is shown in the drawing at the right. 10G STIEF COPPER WIRE BASE - RUBBER ROUND GROOVES BAND BOARD FILED IN BOLTS Stiff copper wires act as contact arms for the switch. They rest in the grooves in the bolt head to close the circuit. ModeTn Mechanix and 8bitD ownload.com

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cA Handy Gadget for Sewing ‘Purposes i Sad -e f | |

BLACK STRIPE `» FOR LEGSN f F.

Here is 3 gadget that is handy for people doing considerable sewing. darning ball. Construction details are shown at the right. Io queer looking gadget is really one of the handiest devices imaginable for women who do considerable sewing. H includes a pin cushion, tape measure and an egg-shaped body for mending purposes. Any handy man can construct it in a short time at litile expense. The base is 3 in. in diameter with a 1 12” circle countersunk ‘son the surface. This laiter circle is used as a base for a cork pin cushion of 1% 3” diameter. The cork is then covered with a cloth circle 2%” in diameter. The legs are constructed out of a 21%” wooden cylinder 42” in diameter. Black strips are painted down the sides to give an appearance of legs. One end of the cylinder is glued into the base back of Statue Modeled Out of Newspapers yeas on IN pa Hint . “TAPE END GLUED 4 TO THIS ROLLER

ine-7/ Gere - -

SLOT FOR TAPE

CORK BASE’

—— jt aed

' 4 > j | COUNTERSUNK j

y i KB? t] Fi f INDER ~ m ° CGS oe 7 e `AE GLUED HERE a | wo CLOTH COVERING 2 as 340 PIN CUSHION It contains a pin cushion, tape measure and Note especially how the head and beak are put together. the pin cushion, with the other end at- tached loosely to the egg-shaped body. The body is 3" long and 2" wide with a curved surface. Two boles are drilled in it, one used to attach legs and the other, the head. The head is 17x" long. Ttis hollowinside where the tape measure is located. The beak or roller is 11447” long, 1 in. being out- side the head and the other ‘&” inside to hold the tape which is glued into place. A slit at the top allows the measure to be pulled out when used. Eyes are painted on the head as decoration. Comparatively inexpensive, the gadget offers an easy way of making spare time money for energetic people. Any up-to-date housewife can make use of such a contrivance. Makes Attractive Wall Decoration ERE is a nifty scheme to decorate the walls of your home cheaply and artistically. It provides much fun as well as practice in the art of sculpture. First take a batch of old newspapers and soak them to a pulp in hot water. Then, using any subject that suits your fancy, shape the head features until a close resemblance to the model is obtained. When modeling is completed, dry the statue over a drying oven. A light bulb in a large tin can may be used for this purpose. . covering of wax will fill in the rough places and act as a ase. The last step consists of entirely covering the model with powdered graphite (soft pencil leads), and aia plating in a copper sulphate bath. The whole process takes but a short time and the materials used cost practically nothing. The finished statue resembles solid bronze, as shown in the illus- tration on the left. Tt is lighter than a picture frame and makes a neat appearance upon ihe wall of a living room. The model used in the illustration portrays the scientist Mendele- jeff, a famous investigator of electroplating.

This statue was modeled out of old newspapers which were soaked in hot water and electroplated. March 107 Inventions for 8bitD ownload.com

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Listen in on ‘Police CRIME by THORNTON HALLET Down on the short waves police radio stations are constantly transmitting or- ders to squad cars cruising about the city on the lookout for lawbreakers. With this little call-box hooked to your broad- cast set you can tune in on these signals and thus have a virtual ringside seat at battles waged by police against criminals. 66g NRUISER number 16. Go to Corner of Chestnut and Main Street. Suspicious man lurking about.—Cruiser number 4. Proceed cautiously up Empire Road and follow Taxi number —. Escaped convict said to be passenger." Do you get this kick from your broadcast receiver? If you don't then you better build one of these Police Signal Call-boxes and get all the thrills of a hair raising movie, from real life. The Police Call-box set up for an exciting evening at The construction is ver simple. First listening in to calls from police headquarters to squad cars. you will need a panel of bakelite, hard rubber or thin dry wood. And as this call-box was built only from what could be found about the shop, any definite measurements or specifications would be useless. Circuit constants however should be about as given. Dimensions best to follow are given in Figs. 3 and 4. Drill panel holes about as indicated so your particular condensers, socket, etc., can be arranged somewhat as indicated in Figs. 3 and 4. Following the schematic diagram you can then wire up in connection with the picture diagram (Fig. 2) which should Here's how your call-box will Sook when completed. The flexible cord leads to the base in the receiving set. goes IRON TO ANT. COND. GRID COIL VOOUOUY UY ~- = ~~ TO 00025 25 1 gS FIXED COND. TURNS nn 0 SWITCH ARM 7 E GRID COIL ao 00025 ee VARIABLE TUNING COND. TO PLATE PRONG TO GRID KATHODE,ETC. Ny ee i 8 OL) 0 TICKLER — “ECOL GROUND ON TO GROUND SHIELD POST OF RECEIVER os f o ETARE] REGEN, COND. | $ : ECAR —_—— face RES 5 PRONG Ha— 2" —— HEATER PRONGS PRONG : Fig. 1. Wind the grid and tickler coils on the same form following the dimensions given at the left. The form is mounted under panel with the angle irons. At right is seen the circuit. The tube is a 227 generally used in broadcast sets. 103 Modern Mechanix and 8bitD ownload.com

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‘WAR With “Broadcast Set make it very easy for anyone to hook up without error. What to do about the grid and tickler coils? For this rig use a 2 inch form about 4 inches long. The grid coil consists of 25 turns of No. 22 DCC wire wound close to- gether. Tap off at the 7th turn from top end. The tickler consists of 15 turns of same size wire with about % inch spacing be- tween the two coils. Flood the turns with Duco cement to hold them from slipping. This coil form can be mounted vertically under the panel with two little angle "irons. Making the Receiver Plug The plug is made from a discarded 5 prone tube. Knock out the bulb and remove the leads from inside the prongs. Then solder the aforementioned wires into the two heater and plate prongs and fill the shell with wax to support the wires. The tnside of the box can be lined with a tinfoil] shield by shellacking the wood and foil and then, when they are DE spread- ing the foil smoothly in place all around the inside. Bring the foil at one end up and over the edge to make positive contact with the strip under the ground binding post. Paint the box any suitable color outside. Then fasten the panel and the “works” in place and you are ready to hook up to the receiver. Remove the antenna from the receiver and attach to ant. post of the call-box. Then connect the ground post to the ground post of the receiver. Remove the detector tube from the receiver and place it in the call- box socket and insert the plug into the detector socket of the receiver. Turn on 85 MIL, RF. CHOKE 00025 ANT. CONDENSER STATOR A 00025 TUNING GND POST TO RECEIVER Oey) TINFOIL SHIELD A Uy My GRiD COIL— 25 TURNS ~a TO HEATER ` PRONGS OF PLUC% the receiver. This should light the call-box tube. If it doesn't, investigate the plug wir- ing from plug to socket. When the receiver has warmed up you will hear the usual rushing sign. Turn the regeneration condenser about half way in and then slowly turn the tuning condenser. The dial should be a vernier for line tuning. Don't be in a rush. Short wave work takes much more careful tuning than the broad- cast band. If you hear a whistle in the speaker back off the regenerator until the signal clears up. It may be code or it may be voice. Tuning for a Police Station With switch arm on A you wil] hear the calls lying in the 120 meter band and with it on B you can reach the bottom of the broadcast band with the police calls just below. In between will lie the code and phones of the amateurs working on the 166 meter band. When a station is found the volume can be built up to its loudest point with the regenerator. Then carefully readjust the tuning condenser until you get the loudest and clearest signal. Remember that with the call-box shown in the photos and herein specified the two variable condensers were of the 11 plate variety and the coils wound as specified. If you have no 11 plate condensers (cap. .00025) you may use 9 or 13 plate affairs but this will affect the windings of the grid coil somewhat. For a 9 plate tuning con- denser you will probably have to have nearly 30 turns to the grid coil or for a 13 plate tuner the coil can be reduced to per- A TICKLER COIL— 15 TURNS a GRID LEAK 4-6 MEGOHMS | 00025 GRID CONDENSER ~~ ©0025 REGENERATION VARIABLE CONDENSER ot teas FO PLATE PRONG OF PLUG TUBE BASE Fig. 2. This picture diagram will make the hook-up easy for you. Run your wires according to the arrangement shown, keeping all leads as short as possible. Inventions for March Note that rotor of tuning condenser leads tinfoil on the inside of the cabinet. 109 8bitD ownload.com

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Police Call-box Can Be Assembled From Spare Parts in Radio Workshop haps 22 turns. This is only approximate and will call for some little experimenta- tion. Better stick to the prescribed capaci- ties, however, if possible, as the coil turns specified work admirably with the conden- sers specified. Use a long antenna for picking up these police signals because with this arrange- ment no RF is used ahead of the detector and the usual short inside antenna or wall tape is next to useless. An antenna wire around 100 feet will do nicely. Stations You Can Listen For Below is a fairly complete list of police stations using broadcast transmitters. As before stated, they are banded together in wavelength above and below the Amateur Band and switching over from A to B will enable you to bring in either section at will. Amateur telephony will also prove inter- esting when police calls lag. If situated away from cities the police calls will not be heard much except during evening hours but if you are situated in or near a city using this police system then you should be able to hear the calls at about any time. Top view of call-box. Tuning condenser dial is seen at right, regeneration condenser dial at left, tube socket in center. TO GROUND POST OF RECEIVER TO PLATE DOL VERNIER DIAL . FOR TUNING FOR TUNING Police Radio Stations in U. S. Nid Frequency Cri engt (Kilo- a PAPEETE PONT (Meters) cycles) Letters Location Fig. 3. This drawing, in conjunction with photo at top of 121.5 2.470 P a an Ta. page, will give you lucid idea as to efficient layout of parts. WPDZ Fon Wayne, Ind. WPDT Kokomo, Ind. WPEC Memphis, Tenn. KGPI Omaha, Neb. WPDP Philadelphia. Pa. KGPD San Francisco, KGPM San Jose, Cal. WRDQ Toledo, Ohio 122.0 2,458 WPDO Akron, Ohio WPDN Auburn, N. Y. WPDV Charlotte, N. C. WRDH Cleveland, Ohio WPDR Rochester, N. Y. WPEA Syracuse, N. Y. 122.4 2,450 WPDK Milwaukee, Wis. WREE New York, N. Y. WPEF New York, N. Y. WPEG New York, N. Y. KGPH Okla. City, Okla. KGPO Tulsa, Okla. KGPZ Wichita, Kans. 122.8 2,422 KGPX Denver, Col. Rear view of the panel. The tuning condenser should have WPDF Flint, Mich. . sao i = - WPEB Grand Rapids. Mich. plenty of room to swing in. Coil form is seen at top center. WMDZ iadianapolic. iad. WPDL Lansing, Mich. R.F, CHOKE 4-6 MEG. RESIS. oe oa S WPDH Richmond, Ind. 123.4 2,430 WPDI Columbus, Ohio (Continued on page 138) LUG FOR SHEET OF TINFOIL CONNECTION TO GROUND POST STRIP OF METAL UNDER GROUND POST CONNECTS WITH SHIELDING TO PLATE HEATER Fig. 4. Here's how you should arrange parts on the back of the panel. The strip of metal under the ground posts connects with the tinfoil in cabinet to provide ground. 110 8bitD ownload.com SHELLACKED _IN- SIDE BOX Modern Mechanix and

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Simple Wheatstone Bridge for Electrical Experimenters DETAIL OF GALVANOMETER MAILING T UBE ;

BATTERY BINDING Poets 30 TURNS OF NO.28 DCC. WIRE | 3 EXTERNAL UNKNOWN RESISTANCE

RHEOSTAT B WITH INTERNAL BATTERY WIRING DIAGRAM

BINDING POSTS FOR UNKNOWN RESIST-

= BATTERY IF USED I i<—_t i BATTERY

Fhe wheatstone bridge assembled ready to determine un- known resistances. The three rheostat dials are adjusted in the determining process, the galvanometer telling the story. WHEATSTONE bridge is one of the standard pieces of electrical apparatus for laboratory use. While a manufactured bridge of extreme sensitivity is somewhat cosily, the electrical and radio experi- menter can construct his own at very small cost. This one will do very nicely to measure unknown resistances, find unknown con- denser capacities and also inductance values. The one shown will handle up to J000 ohms as unknown resistance but by substituting larger known resistances, the value of the bridge can be raised much higher. You will need a good sized, flat cigar box, three ten ohm rheostats with knobs, switch, four binding posts, small compass, section of mailing tube and some wire and scrap metal. March Inventions for

Ses SS Se INTERNAL “SSS

——_

LTE rir ie = = BINDING POSTS END OF LNE FOR UNKNOWN INDIN RESISTANCE Ag EA A | Yee STANDARD END OF WINDING PIGTAILS FOR USE ~CALWANOMETER — pinDING POSTS FOR BATTERY

Follow these drawings to wire up the galvanometer. The unknown resistance attaches to the left binding posts, the battery to posts at right. Note wedges holding coil. First place the rheostats 1n the box lid with the knobs projecting through on the top side and near the front edge. From left to right letter them A, B and C. Then calibrate them by closing all three up so no resistance is included. Draw an arc around the knob and divide it into ten equal divisions of one ohm each. _ Then divide each ohm into ten subdivi- sions of one-tenth ohm each. This will give you 100 points under each knob for accu- rate readings. A paper scale can be drawn and pasted under each knob or the scale can be inked directly on the Hid itself. The galvanometer is easily made. Cut off a section of 3-inch mailing tube about 1 4 inches wide and wind on about 30 turns of No. 28 or No. 30 DCE wire as shown in the top drawing. "Sew" the ends of the turns into the cardboard of the tube after pulling the windings tight and then cover the latter with a coat or two of shellac to bind them. Place the coil on the lid back of rheostat B fastening it with a couple of little bolts through the lid. Then solder the base of the compass to a piece of stiff brass about % inch wide and bent in the form shown in detail to act as a Support. Fasten this support to the lid at right angles to the coil and so the com- pass sits about in the center of the coil. The details of the galvanometer and its finished appearance are clearly shown in the sketch. (Continued on page 142) 111 8bitD ownload.com

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The popularity of the ‘“Flutter-round” 19 attested by the expressions of delight on these youngsters' faces. After lit- tle practice it's easy to swing ’round and ’round at high speed. S| FLANGE A| "FLOOR Bi2 FLANGE k t2" 2. 3) TTRY “n,o t: Siaj: CN LIGHTLY NS HANDGRIP AND O LARGER THAN FOOT REST La! PIVOT pL" by DICK COLE Gravity WHIRLS Chis Manipulating gravity whirls you ’round and round on this fascinat- ing playground device. DOUBTEDLY the merry-go-round is the most popular attraction for youngsters at any amusement park. Other more or less sensational amusement devices ride the wave of popularity for a while and then fade away. But the merry-go- round goes merrily around forever. Herewith is a variation of the conventional merry- o-round which can be uilt ne by any man handy with a few tools. It can easily be dismantled and moved from place to lace. In fair weather it can be used on the lawn or in the garden; in nasty weather, in the garage or play room. The "Flutter-round", as we shall call this gadget, is manually operated, but not with wheels, pulleys or gears. The rotation is maintained by the riders slightly shifting their weight at the right moment and the device is wholly free of any finger-pinching gears and levers. A few minutes' study of the accompany- ing drawings and photographs will reveal how the "Flutter-round" operates. It wiil be seen that the seats are attached to two radial cross pieces which are free to slide on two other radial cross pieces which are rigid to the vertical axle. The axle turns within the pedestal post which is tilted about seven and one half degrees. Thus the radial pieces rotate in a Slightly inclined plane, instead of in a horizbonital plane, as in the case of the con- ventional merry-go-round. SS SS STI 112 Seen J-N SLOPE I" IN 10" ee STOP BLOCKS T8? | (a EI PEDESTAL BASE Dimensions for main parts may be seen above. Sloping cut in pedestal base gives the pedestal e a seven and half degree tilt. Modern Mechanix and 8bitD ownload.com

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Cascinating “Glutter-round” What makes it go ’round and ‘round? The operating system can be readily under- stood. When a rider reaches the highest point of the inclined plane, he pushes his seat—-incidentally, his weight—farther back from the center pedestal. At the same time, the, rider at the lowest point pulls his weight forward with the handholds. Thus the center of gravity is elevated above the center of oscillation. The rider at the top point swings around to the bottom. Each rider repeats the move- ment at the top and bottom of the plane Very soon the youngsters acquire the knack of synchronizing their movements to the rotation, and very little manual effort is required to keep the “Flutter-round” go- ing round and ’round. The drawings show plans, elevations and perspectives of all the parts entering into the construction, and but few explanations need be added. It is best to make this device of hardwood—oak or maple—but good, clear white pine will serve for al] parts except the rigid cross pieces. These must be of selected hardwood to provide the necessary strength. ee ee The pedestal post 1s shown octagon 1n the Pedestal. Note the tilt of this upright part. The device shape. To prevent the post from splitting it may be disassembled and set up indoors in bad weather. is well to drive a collar of steel tubing over the end. In fieu of this, the end can be closely wrapped with gal- SMENE RADIAL MEMBERS e "] vanized wire and soldered. i (Continued on page 136) FROM 34% 10” PINE DISC SEE DETAIL AT LEFT HAND GRIPS TRIS END ABOUT t2 “HIGHER THAN OPFOSITE END Two pieces which form pedestal base ana the seats can be cut out on a band saw. Drawings at right illus- trate Propet assembly of parts for the ‘Flatter-round.”’ — Inventions for March 113 8bitD ownload.com

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Electric “eCYSTERIES” “Run Imagine a gate that opens before your car at a touch of a button on the instrument panel —garage doors that swing open to a blast of the horn! These are features of the "House of Magic” on a poultry farm. Horn blast from auto opens garage doors. ‘HE House of Magic," 1s what the neigh- bors of William Udd, ie farmer at Issaquah, Washington, call the comfort- able home where he has put a number of electrical novelties to work for him. When Udd drives up to his garage, he is welcomed by a bark of greeting from his dog. Sound waves from the dog's bark actuate an electrical device which causes the garage doors to open and the lights to be turned on. Udd has fashioned a humidity meter from an alarm clock which keeps his chickens indoors if it is raining. When moisture in the atmosphere goes above a certain point, current is automati- cally switched on and the henhouse doors closed. If an armed man should enter the gate of the Udd home, the household would be apprised instantly of its danger. Sensitive vacuum tubes at the gate would be affected by the metal of the gun and a red light inside the house would flash a warning. When Udd approaches the closed gate of his home in his car, he presses a little but- Sound waves agitate thin strip of metal which sends current through coherer, relay, and magnet to open doors through simple trip device. It seems like black magic to auto passengers when garage doors swing open in response to the welcoming bark of the family dog. At right, a red light flashes inside the house when an intruder, armed with revolver or other metal weapon, passes the "detective" gate. Arrival of ordinary visitors is announced by the flashing of a green electric bulb inside house. 114 Modern Mechanix and 8bitD ownload.com

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“his SFLOUSE of (MAGIC ton on the instrument panel. Presto! Silent- ly, the gate swings open to admit the auto- mobile. The secret lies within a wooden pillar of the gate, shown in the photographs, which contains an automobile battery, dry cells, and other necessary equipment. Pressing the button on the instrument panel sends an electrical impulse through the ether, picked up by antennae at the top of the pillars. This operates a coherer, providing a path for battery current which is carried to a sensitive relay, closing a switch which operates an electromagnet that pulls open the release catch of the ate. j Udd also has a telephone mouthpiece, with a short dangling wire attached, into which you can speak and hear your voice boom out from a loudspeaker on across the room. Then there is another stunt in which a variable condenser is placed around the subject's forearm. Two fine wires lead to the loudspeaker, with an oscillator and three-stage amplifier inter- vening in the wires* path. The condenser changes capacity in response to rhythm of the heartbeats; and the impulses are car- ried to the loudspeaker, throbbing out to fill the room with sound. Entrance gate to the "House of Magic." When a button is pressed on instrument panel of car, the impulse is picked up by mechanism inside pillar (shown close up at the right) and the gate is swung open auto- matically. Voice issues from loud- speaker without hookup. | Chickens don’t have to know enough to come in out of the rain on Mr. Udd’s farm. A humidity meter automatically closes door of henhouse when moisture in air indicates a storm. Right above, woman listening to her own heartbeats, electrically amplified to such degree that the sound fills an entire room. A variable condenser is plac d around forearm. Inventions for March 115 8bitD ownload.com

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Kyack Lines and Profile Show Interesting Details of Form and Parka

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m a ; { < z d D S m . x Y J WwW a - 144 | | fn te | A kyack, as will be noted, is double ended in the true sense: both ends are exactly alike. Note detail of parka molding. Cheesecloth and paper laid in varnish do the trick. The foot rest is made of a board of 74” stock braced by an angle. This will allow you something to root against when paddling. The molding will take a summer sleeve for warm days. The lines are shown as they will look when you have made them full size from the mold section dimensions. 116 Modern Mechanix and 8bitD ownload.com

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How to “Build a KYACK Stu FFING OF KAPOC iN COLLAR © DETAIL OF OEE Gee STRINGS A s A ey if o This is the parka which keeps out the water, and makes the boat almost as though it were a part of the user's body. Duffle bag and summer sleeve are added adjuncts. by SAM RABL PRING time and reminiscences—dreams of years ago and of how as a pair of high school kids we built our first boat. No glo- rious Spanish argosy looked half so wonder- ful to our eyes as did that little hooker built over a frame of barrel hoops and strips of cull lumber secured from a nearby box factory. The covering was the unique part of the job. Somewhere we had seen the plans of a boat built from paper and as we could not afford canvas to cover our frame, we cov- ered it with many layers of newspaper. Each layer was pasted to the one beneath it with a mixture of tar filched from a nearby tar barrel and rosin secured from the scrap- ings of whisky barrels stored behind a neighboring distillery. With fingers blis- tered from the molten mixture we proudly launched our creation and much to the sur- prise of bystanders and ourselves it floated. Inventions for March The kyack is a highly developed form of boat, and will outlive most any boat in rough water. A logical develop- ment by the Esquimau, they are fine for paddling. We used this craft for two seasons. Our next creation was a pair of twin kyacks, this time covered with brown wrapping paper, each layer set down with varnish. A canvas deck kept out the water and for five years we cruised these little hookers into the far reaches of our beloved home waters in Chesapeake Bay. Now the white man copied the gracefu! Indian canoe as a craft of pleasure and utility. Over the crude construction of the red man he molded the modern creations that now flock over our streams to carry JOhnnie and Tillie to their favorite berth beneath the shadow of the willows. Ideal for Rough Water Up in the Arctic, a cousin to our red men. little Willie Eskimo, did most of his canoe- ing on open water, to wage his ever endur- ing war for food which comes to him only by the way of the sea, and a turbulent sea at that. He invented the kyack and today the white man who must do his canoeing on white water copies the little skin covered boat with the same improvements that he has put in the Indian canoe. The kyack will go anywhere a canoe will go and be- sides this 1t will ride out waves that would sink a canoe, and for that matter many a larger vessel. To those to whom a canoe only means a party on the quiet waters of an inland stream the little boat described in this article will have no appeal, but to the man who likes his cruising on rough water and does not want to wait for his weather the kyack will find its greatest appeal. We have learned a lot since the days of our first kyack and many new materials have appeared on the market that now make 117 8bitD ownload.com

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Framing and Tough Covering Shown in Dimensional Skeleton Details MA PIECES 34 SPRUCE 5 ~~ CLENCHED “8 COPPER TACK SECTION A57 2e ar ESS yê! o ag AT RIBS SECTION FABRIC DECK STRINGERS THROUGH STRINGERS GUNWALE AT STEM Here are the dimensions for (he stem. The way the hull possible a craft in which every fault that our first kyacks possessed is licked to a frazzle. Casein glue and airplane fabric have con- tributed to the wonderful strides made in the construction. We were called upon some time ago to design some ultra light floats for a glider and we naturally turned to our light paper experience in producing these floats. We improved the slow process of varnish adhesive with the use of casein flue and further aided the puncture proof qualities of brown paper with two layers of cheesecloth. While the framework of our floats failed under landing impact the paper covering remained intact, even resisting the sharp edges of splintered framework. Asa test of the waterproofing we allowed the floats to remain afloat for a week and noticed no harmful effect. Putting Her Together To begin the construction of the kvack a piece of 2x6 inch pine is secured and shaped as shown on the detail sheet for the keel horse. Five molds are made from any rough Jumber available to the shape shown on the plans. A piece of spruce }2"x2" is laid on top the horse after tapering the ends down to a 4” width and the molds are slipped over top of this piece. The stem pieces are erected at the ends of the keel and spruce strips of *®3"x14" are equal- iv spaced around the molds below a clamp of *s"'x1 12"spruce whose ends are tapered KYACK BLUEPRINTS For Rabl's Kyack Design Blueprints for the little boat shown in this article can be had at the home office of the magazine for the sum of $1.00. While they are no more complete than the plans offered here, they are larger and they are much clearer than it is possible to show on a Page this size, hence they are easier to work from. Made directly from artist's originals. Send $1.00 to Blueprint Department, Modern Mechanix and Mn- ventions. 529 South Seventh St., Minneapolis, Minn. Lis is covered with successive layers of paper is also shown. down to a width of %”. After the longi- tudinal frames are in place the transverse frames or ribs are bent inside the stringers and fastened to them with a one-inch cop- per tack at each intersection. The ash ribs are made pliable by soaking for several hours in hot water and it might be well to clamp a band of thin metal between the sheer chimps clear around the null to pre- vent its spreading «nd bulging when the ribs are forced down in place. Be sure and drill for every fastening and drive the tack from the outside against an old flat- iron or a large diameter iron bar to clench it. The framework should be given a coal of thin shellac before the covering is applied. Wrapping Paper Covering A roll of brown wrapping paper js next sawed into lengths about five inches wide and wrapped diagonally around the hull starting at the center and working toward the ends. The sfringers are covered with casein glue at the points of contact. Be sure that the lap of the paper is a half inch at the keel. The laps at the gunwales will be somewhat greater than this due to the shape of the hull. The paper should be moistened with a damp (not wet) Spouse before application and when dry will get a drum-like tightness. Over the paper a layer of cheesecloth is applied and the next layer of paper is run diagonally opposite. The cheesecloth should not be glued to the first ae of paper as the glue is spread under each strip of paper of the second layer as it is applied. After the second layer of paper is applied it is allowed to dry and it is then given a light coat of air- plane dope or clear lacquer to waterproof it as no varnish will soak in this far. The second layer of cheesecloth and the third layer of paper are Dan in a like manner with the exception that no lacquer is used. The deck beams and stringers should be (Continued on page 144) Modern Mechanix and 8bitD ownload.com

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Home Incinerator Built Into Brick Wall Is Inconspicuous NCINERATORS in town and city are necessary evils, but here is one that minimizes the evil in a most original way. It can be built as part of a five-foot brick wall surrounding your back yard, yet ing merely as an extension of the wall in- ward. On the side inward from the street is the metal door where the trash enters the box-like interior, and at the bottom on this same side is the opening through which ashes are removed. This placing of the incinerator is not objectionable to anyone when in use and scarcely to be noted when no smoke issues from its top. Ivy may be planted at its base, as along the whole wall. This will screen it entirely. Built as a part of the wall the incinerator calls for little extra work and but few more brick, thus costing considerably less than a separate incinerator. Pen Filling Easy With New Cork ante ie st eR When the fountain pen is to be filled, the point is thrust into the hole in the top of the new sleeve. This forms a leak-proof joint, per- mitting the bottle to be tilted up to get the last drop of ink from the bottle. Lower photo shows cork being put into sleeve. ILLING a fountain pen from an ordinary ink bottle is a a job, unless you util- ize anew Special cork for the job which has just been patented. Shown above, the cork fits into the neck of the bottle, and has a hole in the top into which the point of the fountain pen is thrust, forming a leak-proof joint and Parin the bottle to be up- ended. When the filling job is completed, the top cork is replaced closing the top tightly. Use ofthe cork avoids all messiness a permits you to drain the ink to the last rop. Inventions for March The incinerator is built as part of the brick wall as illus- trated here. The cost of construction is negligible. Vanadium Found in Sea Squirts A REMARKABLE chemical difference be- Là tween the blood of the lowly seashore animals called sea squirts and other animal groups has been discovered by a distin- guished Roumanian biologist. Instead of the iron found in the blood of higher ani- mals the scientist finds the blood of the sea Squirts to contain the rare metal called vanadium, now used industrially to make certain kinds of steel. Vacuum Sweeper Acts as Dust Pan ie THE kitchen or any room where rugs are not used, the cleaner may be put to convenient use in lieu of the convention- al dust pan. Place the cleaner in the center of the room, start the motor and proceed to sweep the floor in the usual manner. Instead of sweeping the dirt into a small pile, to be picked up later with the dust pan, merely direct it toward the cleaner, which will dispose of it instantly and efficiently. Dust from linoleum is swept up close to the nozzle of the sweeper which then does duty as labor-saving dust pan. 119 8bitD ownload.com

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A Time Saving Switchboard for Amateur Electricians RAILS OF VARIOUS | TO THIRD SECTIONS Ato GROUND RAIL In wirin needs. serviceable for plating jobs. negative instantly. Neon Tube for Night Signaling B Scouts who like to do night signal- ing will find good use for this little neon blinker set. First youll have to pro- cure a neon tube and a key. Mount the tube in a reflector as illustrated at the right and hook up the key as in the draw- ing. Plug the T in a 110 volt outlet and bang away at the key. One advantage of the tube is that the flash is instantaneous. The light comes to full glow instantane- ously and shuts off instantly, making for unusual distinction in night enw For a Key, any old telegraph signaling key will do duty excellently. NEON TUBE Mount neon tube in a reflector as illustrated in photo. Tube is hooked in series with key and 110-yolt bayonet plug. 120 up your switchboard select the circuit above that best suits your oltmeter and ammeter are optional, but they will prove extremely Reversing switch shifts current from positive to RE you one of the wire twisting fra- ternity who has grown tired of per- petually changing wires every time you decide to reverse the current or change the voltage to one of your pet motors or enerators? If you've wanted a switch- oard to do the work here's the answer to your prayers. This switchboard will work fine with a storage battery, dry cells, or a toy trans- former. It will allow you to change the voltage in several steps, reverse the cur- rent, switch it off, use the rheostat to dim the lights, or switch the current to differ- ent circuits. The apparatus will carry in excess of 500 watts. An old radio panel may be put into ser- vice, and if you like an ammeter and volt- meter may be added for use in electro- plating and other experiments. For safe- ty's sake a tubular fuse of the automotive variety may be added to prevent over- loads. Mount all the switcharms, switchpoints, and other equipment as suits your con- venience. Then wire the board accordin to the accompanying diagrams. Twiste lamp cord will easily handle the current. The panel may be used to deliver differ- ent voltages, or it may be used to switch the current to the various isolated blocks of a model railway system. fn order to reverse the current it is only necessary to reverse the current from ihe top to the bottom pole. Modern Mechanix and 8bitD ownload.com

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Bumper Trunk Carries Extra Gear on Your Camping Trip ECHANICALLY-INCLINED motorists can solve the problem of overcrowded cars on the lon TF by constructing in- expensive "trunks" for carrying extra food, clothing or camping equipment. The space between the lower part of your radiator and the rear of your front bumper can be utilized as a bumper "trunk" for transporting ice, food or clothing. Lay out the two sides and bottom of the box on a piece of No. 14 sheet iron, 4012 in. long and 14 in. wide. Then drill six *4 in. dram holes as shown, and bend sheet on dotted lines. These dimensions are shown in the drawing at the right. In laving out the sheet, note that the rear of the box is supported by the protruding crank shaft protector, while the front is fastened to the center bolt of the front bumper. The wooden ends are constructed as shown, 20 in. long by 9 and 9% in. wide. The % in. difference is necessary so that the box will slope back and drain itself when used as an ice carrier. The top is built of heavy fir, 14 in. by 20 in., and is hinged to the rear wall. Flat-head screws, 114 in. long, are used to fasten the wooden ends to the sheet metal sides. A lining of cork linoleum insulates the contents of the box from the heat of the radiator, and will protect ice-packed fish, game or other perishables in any climate. These metal "trunks" can be constructed for slightly more than the cost of the sheet iron used." al will protect your equip- ment, improve the appearance of your car, and make for greater riding comfort and enjoyment. Truing up the cylinder is accomplished by working the hone in and out as illustrated here. The grooves help keep the grinding compound dis- tributed. The cylinder may be adjusted to exact size by driving wedge into the slit, which ex- pands the wood cylinder to make a drive fit. Cis yy OP hk 4 N o: Nij: ` he 4 N AY Ns KY KY `A RY N ` ` K N roe} Inventions for HOLE FOR 'o >H LES FOR O "eo GLi HOLE FOR i 4 CRANK SHAFT, 4 Co aniis A BUMPER i SIDES Note front and rear holes for securing trunk to the bumper For the Home Auto Mechanic Mo the process of lapping cylinders has long since become obsolete for garage practice, there are many home sho owners who must improvise some way o truing up cylinders. In this case the best practice to follow when removing score marks is to devise a hardwood block as Ulustrated herewith. Throw a hardwood block slightly larger than the diameter of the cylinder to be honed and just as long, into the lathe and turn it down until it is just the size of the bore of the cylinder. hen bore a half inch hole through the block from end to end. Next proceed to prepare a shank as illustrated in the draw- mng. Use a round file to cut spiral grooves. n use the oil or emery for the grinding ees is evenly distributed over the block and the grooves will help keep it distributed. A simple method of expanding the wood block is made use of as illustrated. A saw slot is run into one side of the wood block to the center hole. By driving the wood wedge inward it will be found an easy matter to expand the block till it is precise- ly the right size to fit the cylinder. 121 8bitD ownload.com

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Onfy with a pinhole camera, or with the most expensive corrected tens could such perfect perspective photography highlight. as that shown above be attained. Note HE construction of a pinhole attachment for the camera is a very simple thing and can be made by punching a small hole through an ordinary automobile bearing shim. The best thickness will be found to be between three and five thousandths of an inch. Making a photograph by substituting a small pinhole for the lens is one of the old- est yet most o phases of experi- mental photography. The sag possi- bilities of this type of lens have long been recognized. The soft image obtained, the leasing halos around the highlight and the rueness of perspective are unequalled save with the most expensive equipment. Para- doxical, isn't it? With the recent development of the supersensitive film, a fully timed negative can be made on a bright day with a single exposure from thirty to sixty seconds. Unlike the ordinary camera. lens which is in focus only at a specific distance from the film, the pinhole lens is always in focus no matter what distance it is placed from the ground glass. This property of the pin- 122 BRUCE SIFFORD The construction of a pinhole lens for a camera is very simple and can be accomplished by punching a small hole through an ordinary brass automobile shim. Photos of extreme wide angle, impossible with other cameras except when fitted with costly special lenses, can be taken. A needle is put through a cork and placed on a brass shim. A rap of the hammer makes the tens. hole makes it possible to make photographs embracing an extremely wide angle by placing the pinhole within an inch or two of the film. Although there is a practical limit as to the angle covered by the pinhole lens, it is surprising just how much terri- tory can be taken in. Buildings can be gotten in from a height of 200 feet while the camera is at the curb across the street! A small sewing needle can be used to pierce the metal. However, the ordinary sewing needle is one millimeter in diam- eter which is much too large for a pinhole that will give sharp definition. Therefore some care must be made in piercing the shim so as not to get the hole too large. An easy method of getting the right hole is to push the needle through a bottle cork so that the point is just visible. With a sharp Modern Mechanixgz and 8bitD ownload.com

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EAKING through a ‘Pinhole pair of scissors snip off the end of the needle flush with the top of the cork. Thus with a gentle tap of the hammer the point on the other side will be made to just pierce the shim. The shim is then placed on a razor hone or hard oilstone and ground down so that the edges around the hole are smooth. Then by using the needle in a hand drill the hole can be made perfectly round. After a few turns of this drill the hone should be used apat to keep the edges per- fectly smooth. his process is repeated until a round hole with well defined edges is obtained. For ordinary pictorial pinhole photog- raphy the lens can be mounted right at the center of the lens board, the same as any lens. But for shooting tall buildings at close a a different method will have to be used. In this case it is advisable to mount the shim on an angle block placed at an angle of about 20 degrees to the lens board. This will take in more sky and less foreground. Also the negative will have more even illumination due to the fact that the rays of light passing through the pinhole in a straight line are stronger than those at a slant. This counteracts the unevenness of the light at the top and bottom of the build- ing and makes very even lighting an auto- matic thing. The pinhole shim can either be attached to the block with glue or with adhesive tape around the edges. Remember that the hole in the block should be better than a couple of inches in diameter, because the lens em- braces such a wide angle that the edge of the big hole is apt to vignette the image! By mounting the lens close to the film and at an angle of about 20 degrees more sky and less foreground will be embraced on the image. By placing pins to correspond with lines of divergence of the fens, and by sighting along the lines as shown, one can tell exactly what view he is going to capture. Ground glass focusing screens can not be used. Inventions March 123 for 8bitD ownload.com

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Build Bird Houses Now, Ready for Spring Songsters BIRDS will locate anywhere they are in- vited. This invitation need only be suit- able quarters where they can build their nests, find plenty of food, raise their young, and receive kind treatment. Many of them will return year after year to the same nest and brighten your summer with their cheerful songs. There's no trick in building any of the houses shown on these two pages. They can be made from broken wooden boxes, miscel- laneous pieces of lum- ber and short pieces of limbs. WOODEN DALL

WILL NOT R BE LONG WOODEN SPINDLE f

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¥ LOG 7 iS CUT P N HALF AND THE 7 A J oe <I” a9 INSIDE Wes HOLLOWED PEP OUT i5" DEEP, 7 BY 4" WIDE AT BOTTOM, AND 3" WIDE AT TOP. DOOR IS 2" IN DIAM. CUT OFF TOP AT AN ANGLE AND FIT A SMALL ROOF IN PLACE. THIS WILL PREVENT CRACKS AND WEATHERING. See

" DETAILS OF THE WOOD-PECKER HOUSE

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DETAILS OF A FOUR COLONY MARTIN HOUSE Martins prefer multiple dwellings set out in the open away from buildings and trees. The above diagram shows a 4- toom house. On the left is a novel wood-pecker house. Since these houses can be made without detailed information, it will be well here to outline a few of the individual likes and dislikes of the various birds, so that in building their future homes you can make them to suit the expected occupants. Houses should not be stained or painted on the inside because bright colors often frighten the birds. Any dull color can be used for the outside; gray and brown being favorites. Martins are o the best loved song- sters. They will return summer after sum- mer and prefer multiple dwellings, like the one shown on this page. In placing the house, put it in the open, on a supporting Modern Mechanix and 8bitD ownload.com

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Let's “Build a “BIRD SHEOUSE | Invite your favorite songsters to live in your yard by building the houses shown here and placing them in the places where birds pre- fer to build their nests. A o \ A s aS Poe eee, THIS CORNER PROTECTS FROM MOST SEVERE STORMS N i A \ W W SHELTER: MUST HAVE NO MORE THAN TWO WALLS, HOLES IN ALL HOUSES 5"SQ. AND 6" HIGH WITH A DOOR ABOUT |" DIAM. h M NR ( ALL BIRD-HOUSE DIMENSIONS ARE INSIDE MEASURE- MENTS. THE TINY WREN- HOUSE IS FOUR INCHES WIDE, HIGH, AND DEEP DOOR IS z IN DIAM. The secret of a successful wren house lies in making the door small enough so that sparrows won't drive the wrens away and take it over. Extended floor board serves as perch. Inventions for March ite A HOUSE 5" SQUARE BY 8" HiGh IS SET 5FT. ABOVE GROUND. THE DOOR [5 5 DIAMETER FOR THE BLUE- BIRDS The above blue-bird house is made from scrap pieces of lumber and set up off the ground about 5 feet on a wooden pole or metal pipe. Robins prefer the frame shel- ter shown on the left and will not nest in any house having more than two side walls. Set robin houses neat the ground. pole, away from build- ings and trees. Wrens like to live close to the ground. For that reason you can put their houses over the kitchen door, under the eaves, or on lower branches. Set them high enough to be out of the way of cats and inquisitive children. Remember, the door is but % inch in diameter — if you cut it larger the sparrows will take over the dwellings. Robins will not live in an enclosed dwell- ing. A roof, floor, and one or two walls constitute their new home. Most any type of single dwelling is suitable to the blue- bird. Woodpeckers and screech ow!s will pick out the home fastened high up on a tree or telephone pole. Houses should not be grouped, but set in attractive out-of-the-way places. To make ete bird haven complete, include a bird ath where they can always bathe and quench their thirst. A final caution: Don't use tin or metal containers for bird houses. To do so may mean virtually roasting the young birds in their nests. 123 8bitD ownload.com

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Magnetized Glazier's Hammer Makes Glass Setting Easy GLAZIER POINT FILE FLAT \ BATTERIES Magnetism in head of hammer, induced by the horseshoe magnet, holds the glazier points in place for setting glass. Modernistic Book Case Has Simple f AES 7 aE PENCIL HOLDER ae INSIDE 2 s i ARRANGEMENT 4 tg OF DRAWERS A í Dimensions for compartments are given here. Case is backed with wallboard enameled black. 126 Gao glass in a window frame can be a hopelessly awkward job unless you're wise to the tricks of the trade. Even then, however, it's not so easy, but there is some- thing you can do to make the task less disagreeable. Here's what to do: Lay hands on a ball- ein hammer and proceed to operate on it in the following manner. First cut a slot in the face of the head with a hack saw. The location ofthe cut should be about as illus- trated in the accompanying drawing. Your next task is to bring a file into action and lile off a small portion of the side of the head, just beside the slots. This little notch is cut to take the glazier's points, which should abut against the bottom of the filed-out section. The hammer head should be magnetized to hold the glazier points when you are do- ing the pounding. This eliminates the necessity Of holding the points in position with your fingers and thus risking a bruise. The magnetizing process is accomplished by holding the head over a magnet as demonstrated in the drawing. The magnet can be an ordinary horseshoe affair, with about 25 turns of wire wound over each ole. Hook on a couple of batteries and et the hammer rest for a few minutes 1 the position shown. Lines—Surprisingly Easy to Build A living room will enjoy an enhance- ment of its beauty with this modernistic book case resting in some conspicuous location. The framework of the case is cut from % in. by 12 in. stock, beginning with the base and building upward. The bridge compartment is Ia] off as shown and the tally bin and pencil holder are made and fastened to the backs of their respective doors. The large drawer should be constructed from % in. stock except the front, which, like the doors, is cut from M% in. stock. | After sanding and filling with a good ps filler, the case is given two coats of lack enamel and two coats of silver trim on the edges. The doors and fronts of —— the drawers are marked off as rs shown, the squares T being enameled sil- i ver and the corners F black. The drawers ®t and their compart- 4 ments should be stained walnut in- side. The knobs should be enameled black and mounted. Finally back the case with a sheet of wallboard. Many color combinations are appropriate. pe w l | W Modern Mechanix and 8bitD ownload.com

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cA Universal “Bench Lathe Indicator THE advantage of the bench lathe indica- tor shown here is that it can be used in any type of a lathe, large or small. Also that holes even less than 4% of an inch in diam- eter can be trued up with equal facility. The frame or body of this indicator is shown in detail by Figure 1. This is prefer- ably made from a piece of 13/32" drill rod 214” long with 19/64" hole drilled through the whole length. At a distance of 3/10" from each end two diametrically opposite holes are drilled with a No. 50 twist drill which should be ground to cut to size as a No. 50 drill is the tap-drill for a 2-56 tap that is used after to tap the four holes that are to take the hardened pivot screws shown in Figure 2. It is, of course, optional with the maker the style of end that is made on the body piece—the ends can be either plain or fancy as shown in Figure 1 After drilling and tapping the four end holes the sheli of the body is milled down at the two points shown. The lower one for clearance and the upper one near the front 1/64" above center for holding the graduated slide C with tapered sides. The Shank A is held to the body by a screw midway between the ends. The piece of watchspring B acts as a ten- sion against the pin A in Figure 2 and it is held to bottom of body by a small screw with a shoulder. The spring to use will have to be determined by experiment to get just the necessary pressure on the pin A in Figure 2 so that the pointer wilt return to zero on the scale. The pointer shown in Figure 3 is balanced on the bearing end by a 14” ball bearing that has been annealed and slotted to take the thickness of stock used in making the pointer. The pivot bearing is hardened and made a forced lit in the pointer. Its posi- tion in the pointer is determined by assem- bling together the indicator so that there is at least 1/64" space between the two levers. For small work which is irregular and difficult to chuck, indicator will save time in centering. Use shown to left. The only bearing is to be on the pivot ae and the pins A in Figure 2 and B in igure 3. All other points must be free. The pivot screws B in Figure 2 must be tem- pered and hardened and the points pol- ished. These pivot screws are provided with hexagon check nuts which are tight- ened in place when the proper adjustment is found. The assembly view in Figure 1 shows the arrangement of the parts of the universal indicator. The sketches, Figures 1-2-3, give the necessary details. 010 Flat Stock Wal of Spring lerntsion bint neea Contact Point lever. Mam Bopoy fioure-3. UNIVERSAL INDICATOR ASSEMBLY bo TOR. POINT This indicator is based on the double lever principle and is very sensitive. It can be used on holes as small as 1 inch and on stock which has no greater Inventions tor March diameter than 1/16 inch, which fact will recommend it to model makers. 127 8bitD ownload.com

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Fortunes ‘Waiting for ¢ Here are shown three difficulties crying for a simple, cheap solution. In circle, a device is needed to prevent windows from rattling; above, an attachment for a gas stove to prevent condensation of moisture, fogging windows; and a _ self-oiling lock which will not rust hopelessly when not used for a while. by RAYMOND F. YATES EDITOR'S Note: Mr. Yates, the nationally recognized patent expert who conducts this department, mill answer questions of readers desiring advice on how to secure patents, methods of procedure, or ideas for inventions, when such requests are accom panied by a stamped, self-addressed envelope. Never send models; they cannot be accepted and no responsibility is assumed for them. Address Mr. Yates in care of MODERN Mecuanrx AND INVENTIONS, 529 S. Seventh Street, Min- neapolis, Minn. In some instances patents covering ideas similar to those mentioned here by Mr. Yates have been issued: but if described here, you may be sure that a simpler solution of the problem would be a money-maker. A simple attachment for a vacuum cleaner to convert it into a hair drying blower would build a real fortune for inventor. =” i] A New Unit Storage Battery "e Of all the clumsy and utterly inefficient things that this ee civilization of ours is lugging along without, the storage bat- a just about takes the prize. Ow many times have you gone to a battery repairman to have him tell you that one of the cells of the battery that you were using was dead? To replace this cell is not merely a matter of slipping a new one in place as it should be. There is a great deal of labor to it and you wind up with a five dollar bill blown to bits. Now why in the name of common sense can't we have a battery where a new cell could be slipped into place "just like that." Naturally some very efficient method of connecting the new cell in must be devised so that the change may be made quickly. Specifications: This should be designed so that the replacement of a single cell could be accomplished with a minimum of labor, ten minutes being the figure aimed at. The battery should not cost any more than batteries now sold . ; aie Exploitation: This should be patented only in the United Cg} States and should be sold outright for $100,000. A Scissors Sharpener A few years ago a very clever sharpening device for the kitchen was introduced. It consisted simply of a number (Continued on page 140) Steel handles for tools have many advantages if weight problem 15 solved. Below, simple sharpetiet for beveled edges. 128 Modern Mechanix and 8bitD ownload.com

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Reversing Arrangement for the Double M Sport Roadster 1 DODGE STARTER PLACED BELOW WOODEN CROSS , | MEMBER BUT ae eed of paa SMALL BICYCLE SPROCKET The starter motor is chained to the sprocket on the drive shaft as illustrated here. BIKE SPROCKET INSTALLED BESIDE SPROCKET DRIVING CHAIN TO REAR f) END é REGULAR SPROCKET BOLTS MODEL T STARTER REMOVED In operating, it is advisable to place the engine in neutral or disengage the clutch, thereby saving the starter motor the job of turning over the engine. HE M. M. Sport Roadster plans published in the July, 1932 issue of Modern Me- chanix did not make provision for a reverse gear. The car is easily handled, but occa- sions arise when some means of "backing up" would be appreciated. All right. Here's the way it can be done. To reverse, all that is necessary is the push- ing of a button, and in 4300 miles it has never failed to operate. A six volt starting motor driving a small electric chain power transmission to the rear end is the secret. Bike Chain Forms Transmission The model “T” starter connected to your engine is removed. A large and small bicy- cle sprocket and their chain is procured. The smaller sprocket is attached to the shaft on the starter. The center of the large sprocket is cut out and bolted to the left countershaft sprocket as shown. Before bolting together a spacer is placed between these two sprockets so that the drive chain to the rear end will not interfere with the new chain to be used on the new sprocket. A bracket is then made and attached to the frame on the left side of the chassis, and the starter with the small gear attached, is then bolted to the bracket. The chain is then put on over the two new sprockets. The motor, being mounted on the left side of the chassis, and turning clock-wise will now power a small auxiliary drive in re- verse to the power applied by the engine. Starter-generator Conserves Juice The current consumption of the unit is low, but a generator of some sort may be found desirable, and a combination starter and generator from an old Dodge car may be installed in the place where you had the model "T" starter. This layout will start the engine and as soon as it commences to run, will automatically become a generator. They may be picked up at w auto parts depot for very little and will be found to serve the purpose admirably. As this is a twelve volt system two small Inventions for March six volt batteries should be installed in series. Only one of them is tapped for the reverse drive with the six volt motor. In E your car in reverse it will be well to place the engine in neutral or disengage the clutch, thereby saving the reverse motor the job of turning over the engine, backwards, against compression. n case you haven't the July, 1932, M-M issue at hand the editors will be glad to send you one for 25c. Simple Automobile Valve Oiler OTORISTS who do not have their auto- mobile engines fitted with a valve oiler will find this little device a great boon. It consists of a combined valve and priming cup, a pipe tee, and a nipple screwed into the place in the intake manifold where the tube leading to the windshield wiper is con- nected. The parts can be obtained at any hardware store. Only oil should be used which is especial- ly made for use in the upper parts of the engine to lubricate valves. The dose should be about a_ tablespoonful per cylinder, poured in the cup after the engine is warmed up and running. One filling about every 500 miles will give the best results. Nipple of the valve oiler screws into the windshield wiper hole on the intake manifold. Dose about every 500 miles. 129 8bitD ownload.com

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COLONIAL Houses are eMost' Popular DINING ROOM IO-G1Z- House built from plans No, 5-W-33 will always have highest resale value, Since it is built in the best Colonial style, a style which never grows old. For complete blueprints for this house or house No, 5-W-1, shown below, send $1.00 to Modern Mechanix and Inventions Home Building Editors, 529 South 7th Street, Minneapolis, Minnesota. Photo at right shows restful little colonial window bed, ideal for afternoon naps on hot summer days. , L FIRST FLOOR PLAN= Five rooms, well disposed, consti- tute the first floor dwelling equip- ment of house No. 5-W-33. Note fireplace at left in the living room. — =o epee tt, | by Maurice I. Flagg F IS safe to say that Colonial leads all other house styles in populari- tv. Its a style that does oe Eh eae not grow old or go out of D —— iin | | date. This one fact should meee) LD Loom ar: be of importance to pres- al ee ent day builders if for no other reason than that it insures maximum resale value. In other rds, when you put money into a house you've made an investment. And to protect your investment you need style insurance. i Colonial style is therefore much like an old line insurance See : policy. But there are differences in Colonial just as there | i are in automobiles, clothes and other commodities. It's well to know something about these differences and what constitutes the fundamentals of Colonial design. Early Colonial homes were for the most part wood. Many were brick, but wood was the material generally used. And wood is a material easily worked into beautiful forms. Even today a wood house requires the least initial outlay of money and that's one reason why so ee ree i many houses are built of this material. Which means, of Homse Na S WA 5 ¢ four-room struc: course, economy of construction. conveniently in the rear. The porch at The popularity of Colonial is such that manufacturers the side can be used for sleeping in have produced by machinery, stock details, stock interior the summer, while the living room tire- and exterior finish in faithful duplication of the old pat- place provides best indoor comfort in : the winter time. Cost estimated at $5000, (Continued on page 138 ) 130 Modern Mechanix and 8bitD ownload.com bes Loom CEH Living oom Zoe it

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SAVES MONEY, TOO "THINK of the sport you'd have with a swift, eager 4 Harley-Davidson to whirl the miles away! Wonderful vacations— Seeing America First. Week-end trips with a bunch ofjolly riders. Rollicking rides in As Low as the evening— to chase dull care away. $18750 And all at so little expense! A Harley-Davidson costs so — that's the f.o.b. price ot little to buy, and almost nothing to run. A filling of the 1933 Single. And it’s gas and oil seems to last for weeks—watch and see how a true Harley-Davidson—~a completely equipped, speedy, sturdy, wonderfully econom- ; ; ical rele: 4 for Check into the low cost of motorcycling. Ask your nearest literature describing it and Harley-Davidson Dealer about his Pay-As-You-Ride-Plan. our Twins and Sidecars, rarely you ever see a motorcycle filling up at a gas station. Send the Coupon to us for free illustrated literature, ARLEY- DAVIDSON HARLEY-DAVIDSON .JOTOR CO., Dept. MM, Milwaukee, Wis. ——— Interested in your motorcycles. Send literature. CL se a MAIL TH My age is ( 16-19 years, ( ) 20-30 years, € ) 31 years and up, ) under 16 years. Check your age group. s9 Waventions for March 131 8bitD ownload.com

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rep up the radio programs with the NEWEST AND GREATEST RADIO FUN- MAKER. Make the familys and guests roar with laughter by interrupting (Main bruadcasts to make witty and clever re- marks of your own. Be yeur own annoumer. Develop your radio talent. Attac] 1a LITTLE WONDER "MIKI ' to your radio ami hear your own ¥eice through your radio loud speaker. Easily at- ee Simp ¥ push the button off goes the reéguiar program--an the fun begins. Greatest Radia Sensation of the Year. Mailed | postpaid for only $1.00. Send tor i yours today. | WONDER SPECIALTIES, ani a C.A.C. Bleg. evelan fo gA i i e WONDER NR 43 ean TUTE SO MUCH PA 4 ~, f Ea fa" MICROPHONE MEN NEEDED To Operate DIESEL— Trucks Busses Power Plants Marine Engines Locomotives Airplanes Power Shovels Tractors Ice Plants Mining Plants Pumping Plants Many Other Opportunities The Hemphill! Home omg Course. m T includes Practical Shop Training in the famous Hemphill Schools prepares You for Big Pay Diesel jobs—emplovers de- pend on us for Diesel Engineers, You learn quickly—many successful graduates —Write ap for. our. Free illustrated booklet "Big Pay Diesel Opportunities.’ Hemphill Diesel Engineering Schools 2101 San Fernando Rd., Los Angeles 502 Westlake North, Seattle, Wash. TELL MLL ES 55? IF Can Pay You¥s $4829 AWEE No experience needed to act as tay our representative for Master Work Garments. py business concern a pruspert. Basy, pleasant work. You reevive pay daily inhigs cash commissions. Advertising em- f A broidered on garuients is a big sales feature. Yuu can easily add up to = $48.00 weekly toyourregular in- come. We supply everything need- ed to start Hinwediately. Write at once for FREE samples and full particulars. GEO. MASTER GARMENT ÇO., Devt. 725 Ligonier, in diana REA L N ji: 3 “a E7 ~) Yo +6 an Hour SPREAD-A-TKEAD Lae a worn spot for a few pennies, Re-treads entire tire as low ags 75¢. Any- one can do it. No tools needed. Spreads on with a knife. Dries overnight. Tough, flexible, lone wearing. 2,000 additional miles guaranteed. Ends costly re- treading or vulcanizing. ves buying new tires. Rush name Helps prevent blow outs. and address for Free Sample showing toughness. Get special agents offer showing how you can make op to $6.00 an hour. Write. PLASTIC RUBBER CO. OF AMERICA Dept. C-235 E. Court St., Cincinnati, Ohio Thousand Ways to Make a _ Living (Continued from page 65) will furnish you with a stock of books, for which a fixed fee or a small percentage of your earning: are charged. If none of these companies ar: accessible, you can purchase your own books. paying for them from your earnings. Stock only most popular books. These can be purchased & a surprisingly low cost at bargain sales. Read newspaper book reviews to find what books art most in demand. Caring for Hardwood Floors There's a field in every good sized town for «= man who knows floors and can care for them: properly. An electric floor polishing machine ana an array of wood finishing materials will be your chief investment, and a knowledge of woods and finishes, which can be obtained from magazines books and advertising matter, your chief mental requisite. Building up a clientele may be accomplished by visiting stores where wood finishing mate- rials are sold and asking them to recommend you to possible patrons. Personal telephone ealls te clubs, churches, doctors and dentists offices, hos- pitals, gymnasiums and schools will yield addi- tional jobs. When you've built up an extensive clientele you can hire an assistant to do the Scraping, scouring, waxing, varnishing and polishing. Motorboat and Picnic Trips If you live near a lakeside summer resort, you can make money taking guests on day and eve- ning picnic trips in a motorboat which you can rent from some owner if you do not have one yourself. Consult with resort proprietors, point out the advertising possibilities of your service (allow him a small commission if necessary) and post notices on the bulletin boards telling about your steak picnics, marshmallow roasts by moon- light, etc. Scout around for suitable spots for the excursions and arrange a repertoire of entertain- ment, in which history and legends of the locality can be interwoven. Photo Birth Announcements If you have a small hand camera with a rea- sonably good lens, you can make it pay you real money in this way: Follow the birth announce- ments in the newspapers. To each proud parent send a folder or sales letter explaining that you'll be glad to take a hurry-up picture of the new baby so that it may be sent out with the birth announcements going to friends. Enclose an appealing baby picture you have taken pre- viously. This stunt will appeal to parents because professional photographers charge high prices for calls. Your picture need be only a snapshot, if it is of sufficient size. Printers will be glad to work with you in allowing commissions on stock announcements or special designs. Loose-leaf Advertising An advertising manager in retail lines, finding himself out of a job, took note of the waste of advertising matter which he discovered at his (Continued on page 134) ihe- Thank You for Mentioning Modern Mechanix and faventionsfor March When Writing to Advertisers 8bitD ownload.com ae eae

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New Seroll Saw Makes Splendid Record ot Performance maea Hru The Tool That Revolu- tionized Scroll Saw Work Amazing Pencil Test! At 1,800 strokes per minute the ''Delta" Scroll Saw has such perfect balance, such absence of vi- bration, that a pen- cil can be stood on end on the saw table without tip- Ping over. This is the only scroll saw | of this type on the market today that can pass this rigid test. Has Band Saw Efficiency! SINCE its introduction last year this new model "Delta" Scroll Saw has been installed in many thousands of wood- working shops, home workshops, schools, jigsaw puzzle factories all over the United States. Everywhere it has made splendid records of achievement. And no wonder! Its unique design and careful construc- tion enable this saw to run at full motor speed with all are convenient, portable, and compact. All are available in a large variety of combinations and at prices to fit all needs. The "Delta" line includes: Jointers, Circular Saws, Band Saws, Woodturning Lathes, Drill Presses, Scroll Saws, Boring, Routing, Sanding, and Mortising Attachments — and a _ complete line of accessories. springing and twisting eliminated. As a result, this amaz- ing tool produces fine, smooth, accurate work hitherto pos- sible only on a bandsaw. Has 24-inch throat capacity. Works on metal and fibre as well as wood. Can be used for filing, sanding, and honing. Priced astonishingly low For full details, send for the FREE 1933 "Delta" Catalog of Woodworking Units. Mail the coupon below—TODAY! 10-DAY TRIAL tecause “Delta” Woodworking Tools Easy Te PMNS sicient and ing ri : e 3 ractical under actual workin conditions, fey are always available for a 10-Day Trial withou the Slightest risk. Satisfaction is guaranteed, For full details of this hberal offer and also of "Delta" Easy Payment Plans, fill in and mail the convenient coupon below —TODAY! DELTA MFG. CO., 3775 North Holton Street Dept. M333, Milwaukee, Wisconsin FREE Gatalog Describes the lat- est developments in LS B S M E D A S E E a } Delta Mfg. Co., 3775 N. Holton St, i Dept.M333 Milwaukee, Wis. i Please Place me, without obligation on mailing list to receive the FREE 1933 f "Delta" Catalog of Quality Woodwork- J ing Tools. Also send full details of your i 10-Day Trial Offer and Easy Payment Plans. i motor-driven wood- working eguipment NAMO. .nannsnnnsenerannrerern -ammm meen Age?....... i at the astonishingly PUTO S cs cosesassaizunt se raniueclvcieidtecssncadece i low 1933 price I levels. Send the DLA State._.......-+ jee ee ee ee ee ee e coupon Now ! SS AE eS i ed SE i EA FIN THIS BOOK UP TO $25 A WEEK, [4-¥ 3 OR MORE Grow Mushrooms in your cellar or shed. Big demand, Expe- rience unnecessary—ive teli you how. Illustrated book free. Start NOW —write today. AMERICAN MUSHROOM INDUSTRIES, Ltd. Dept, 507 Toronto, Ont. Thank You for Mentioning Modern Mechanix and Inventions for March When Writing to Advertise- 8bitD ownload.com aay Y.N1) | read Write for this Big Free Book tsay. The plete line of radio sets, service men's supplies, replace- test equipment at the lowest wholesale prices. ALLIED RADIO CORPORATION 839 W. Jackson Dept. B ment parts, Chicago iye- 133

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Go up, Young Man, GO UP! | The World's Greatest Opportunities are in

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PLEASURE or PROFIT A fascinating hobby or a profitable business can pow be yours. Prepare quickly at home under the ¥ personal guidance of leading experts in the fine art of photography, No experience necessary. or spare time. Many earn while learning. Our thorough studic method also qualifies you to fill a wel! paying Dosition UPON Fraduation, Seng Coupon DOW 19r r nru booklet, Opportunities in Modern Photography- a 2 ae ee ee eee ee ee eee ee ee ee ee ee ee ee ee SCH OF PH RAPHY g Michigan Kn OS Dept. 2053 Chicago, M. Send FREE booklet, Opportunitiesin Mocern Photography, and full information.

"o m ie m, AMERICAN 3601 Name eere rer a a a a —<—e eo Eee ere ee eee ee ee ee Eee ee eee ew eee ne ene ee Thousand Ways to Make a Living

e( Continued from page 132) front door each day. Visiting the neighborhood stores, he offered to issue a loose-leaf catalog and to distribute pages for it in place of the hand- bills usually used. Preparing copy, getting good printing prices, saving paper stock and distribu- tion costs, he soon covered the entire district with advertising that was filed away in the loose-leaf binder instead of being thrown away. With prices little above those already being paid by the busi- ness houses he was able to make an excellent living and increase the pulling power of the advertising. Rebinding Used Books A St. Louis bookbinder out of employment turned up a lucrative business by distributing cards announcing that he would repair or rebind torn or broken books at reasonable prices. Those desiring his services were instructed to set one of the broken books in a window visible from the street. Driving along the street each day in his car, he was able quickly to get enough business to keep him busy and make him a good living. His children distributed the cards and he was able to control the amount of business for each day by limiting the number of cards distributed. Rent Jig-saw Puzzles During the current craze for jig-saw puzzles. fostered by a desire for home entertainment of light expense, boys and girls, men and women, can easily make a few dollars a week by estab- lishing a jig-saw puzzle rental service in their home neighborhoods. They can make their own puzzles or buy them and rent them either on a flat basis of say twenty-five cents for two days or on a "circulating library basis" of fifteen cents for the first day, a dime for the second day. and five cents a day thereafter. The trick of success is to call at the door with the puzzles and leave a telephone number to be called when the cus- tomer wants to return the puzzle. Simple, cheap ones for kids; complicated ones for adults. Night Snacks for Fraternity Houses A very profitable source of income can be found in the fraternity houses on any university campus. One man has a little "traveling fireless cooker" mounted on wheels which keeps sandwiches and coffee. With a coffee pot, wax cups and cream, sugar and sandwiches he invades the houses at study hour in the evening,—a time when the kitchens are always closed and the ice boxes locked. Fifteen cents for sandwiches, a dime for coffee at this hour are not out of reason for the service involved. Real Estate Agency One woman who was suddenly widowed, found herself with a current load of responsibilities which could only be met by turning to what had been her chief interest--homes. She inserted an advertisement in a newspaper announcing "homes secured—desirable listings" for all types of homes. Then she got busy and really gave some active personal service to her business in getting homes rented for owners, in securing homes for people who were too busy to traipse around looking at the merits of this place and that. She made it - her business to know and appraise rents, and s maaa RIE ; Thank You fer Mentioning Modern Mechanix and Inventions for March When Writing to Advertisers 8bitD ownload.com

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housand Ways to Make a Living Here’s Your Opportunity! I as fair in all dealings. She now enjoys a greater income than her husband could furnish her. Q A 9” x 36” Complete IStamping Out Toys é T Bench Lathe f css moto One young mechanic found himself out of work ~ Screw Easy terms and bent his wits toward the making of simple metal toy kits that could be produced on a simple punch press. The line he evolved was surprising: for less than three cents he found he could furnish ‘all the parts to build a small electric motor, and fa steam engine that would really run. He con- acted a seller's representative through advice gained from the manager of his local ten cent store, and approached the New York chain store buyers through him. He has a plant working | day and night now, and the sales are far from | being supplied. i Children’s Nursery or Shopping "Park" Most every metropolitan city is now split up { Cutting Think of it! You can now obtain a first quality Bench Lathe for only $79. ($89, equipped with motor, ready to use—just plug it into a lamp socket and turn on the switch.) 9-inch swing; takes 18" between centers. Larger sizes available. into small out-town shopping centers which serve rather wide areas of residences. They are also the gateways to the downtown districts. It is at such places as these that a Florida woman has rented upstairs quarters that would otherwise be Cuts 4 to 80 threads per inch ; automatic, reversible carriage feed ; compound rest; six speeds, from 47 to 600 R.P.M.; Vee Belt drive—the modern method of transporting power that minimizes slippage and in- creases power. vacant, and has made them into nurseries where mothers can "park" their kiddies for a moderate fee while mother goes shopping or to the movies, Many mothers these days are without maids due to the depression and welcome competent relief from this quarter. A small down payment puts this fine Lathe in your home or shop ! Write for details now! ATLAS PRESS CO. Kalamazoo, Michigan Genius Breaks Counterfeit Rings (Continued from page %41) By Oct. 1 the counterfeiter's lair was traced to a storeroom in an old ramshackle building in an isolated section of Ozone Park, Long Island. Five members of the ring were nabbed in the raid. Ironically enough, counterfeiters have been flourishing in these depression times when money is scarce. Every big city in the country has had to cope with a counterfeit money wave in recent months and the epidemic is far from being under absolute control. Modern counterfeiters have quite a few tricks by which they fool the public. Their crudest de- vice is "lifting," raising $1 to $10, or $2 to $20 or more by tacking on zeros. Although this is the most elementary, people are often fooled by it. I have known some counterfeiters to split a bill] and then paste one side of it to a fake note and do likewise with the other good half. Still other swindlers in this field are clever photographers $ $ YE and they reproduce a bill by the same process that 12 60 to 3 400 AR a picture is made for a newspaper—these are the o PR E photo-engraving fakers. MEN—WOMEN—18 TO 50 / Franklin Institute STEADY WORK =,’ Rochester N Y. MANY FUTURE JOBS) 7 Gentlemen: Rush to . y “ me, FREE of charge, a SE _¢ list of U. S. Government : K e future jobs. Send Mail Coupon * me EREE 32-page book z describing salaries, hours, work and giving full particulars on how Thread cutting lathe and SURE 7 Countershaft $55.00, use lever in gearbox to shift carriage while cutting reads. / to get one. 12" Band Saw with tilting table $25.00. Send + for Catalogue on these and other machines. 7 Name............. -N ROSSBACHER MACHINE CO. Meee lll “2 (516B Fernwood Ave. Toledo, Ohio 7 Address or iain a: vg eee “hr Biya e Seg aca Se ee, a ee ES RO Thank You for Mentioning Modern Mechanix and Inventions for March When W ritingto Advertisers 135 8bitD ownload.com

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Architecture Carpentry es Leas Carpentry Atchitecture Carpeniry and Building Lawl fra Chae is eer al te and and TTTS ELAS. LATEA CELT kE ES] i 5 Spr ee £ LTA E TEIS- 7 Kir rd eae Pre) Building | | Meeting AP arrears) HELPS for Home Builders or anyone planning to build Hew to Build—What to Build When te Build A gold mine of facts fan often be converted into a gold mine et dollars. fur builders not only save Ingney but learn how 10 make ary nl F ' nore ioney Wwitt> the tive big hoakson architecture, carpenity and building. Carpenters make themselves contras — tors by learning how to estimate correctly; contractors are able to handie bigger and more profitable jobs by learning how the hig fellaws do It. Men who want to build homes van save money hy learning how if should be done. The new Jiffy Indexputs before your eyes without wasted rime, thethings youwanttoknow. Nothing has been overlooked, 1 se ot tools, building construction, heating, lighting, plumbing, architectural draw- ing; al} fully covered We will inchide ath the live vollimes uhove. at the special reduced price of only $19.80 (easy payments) ga handsome book, ‘Blueprint Reading, 120 pages, full diagrams, etc.. without extra tharge. No Money Needed — Don't Send a Penny You take no chance př any kind. Just send us your name and address on the coupon and we wijil ship the vomplete set of five big volumes, 2,400 pages, without a penny of down payment. Look them over, fiil out anything yon want to know and then, al the end of ten days, Hyon want to keep them, send only $2.0. After that send only $3.00 per month until the speciat price of only $14.80 has been paid. (Former price, $24.80.) M FÖR FREE OFFER USE COUPON r American Technical Society, Dept. G-3320, Drexel Ave. at 58th St., Chicago, Il. I would jke to look al the five books desrribed above. Send them on your free offer. I will examine them thoroughly amt return them an ten days unless I like them, in which case 1 will send you $2.00 and after that $3.00 per month until the total price of only $19.80 is pi id. You are also to -send me your bouk, “Blueprint Reading. without extra charge. . IO 2h Acco & eed ais wn a en aL ei ae meee Gee uy * Sie a ae Address Emptoyer's Nane & Address Repol a Pai É Mends a chute or straightens a beel for 1 vent. New plastic invention—sA VASOLE—spreads on soles like butter on bread. Hardens aver-night into smooth, strong wearing snvfarce. No Nails. ™ Old knife only tool Child can apply. ‘‘New’’ soles and heels look and feel like leather. F 390 a WEEK For You ae cleaning up hig money in spite of "Hard mes_’’ Basy spare time or full time work pays bir. Experience unnecessary. any sales in homes, factories, railroad yards, etc. Rich territories open. pCO for TH ESA of Savasole on leather. E SAVASOLE CO ‘Cincinnati, Ohio ELECTRICAL ENGINEERING Complete Course in One Year A CONCISE, comprehensive course in Electrical Engineer- ing to prepare, ambitious young men of limited lime for new opportunities in the electrical field. Mathematics, engineering drawing and intensive shop-work. Students construct motors, install wiring, test electrical machinery. Bliss Men Make Good PREPARE NOW for future opportunities. 30 years' | successful experience assures you maximum training in minimum time. Catalog on request. Rs Li S ELECTRICAL SCHOOL 303 Takoma Ave., Washington, D.C. -° Chill 136 A Gravity-driven “Flutter-round” (Continued from page 113) The rigid radial cross pieces are bolted to a large floor flange, which is fitted with a length of pipe that serves as the vertical axle. Ordinary water or gas pipe will not do; it is likely to break off at the threads. One should obtain a 12" length of high-pressure steam pipe or heavy-walled refrigeration pipe. If only ordinary pipe is avail- able, reinforce it with a piece inside and braze the whole to the floor flange. It is desirable to have a roller bearing on top of the pedestal post for the floor flange to revolve on, and a suitable one can be found at almost any auto wrecking yard for two bits. The construction of the handholds and foot- rests is quite obvious. These should be made ot Straight-grained stock, as they are sometimes put to considerable strain. Note the little stop-blocks screwed to the ends of the rigid cross pieces. These are to limit the movement of the sliding cross pieces. The seats can readily be cut out with a key-hole saw-—~or. better still, with a home workshop bandsaw. There! The "Flutter-round" is almost ready to flutter around. The final operation is to sand the sliding surfaces and treat them copiously with floor wax. Of course, riders of approximately equal weight should sit opposite each other. ~ THE GREATEST BUY g Hand-made—6 ft. LEMONWOOD BOW and Arrow Tax and post-paid Clip this adv. aud carder today. Send 4c postage for big catalog. L. E STEMMLER CO., Box C16, Queens Village, N.Y White for FREE Odwvice hon or ENGINEER [ao No cost. No obligation. Reply Arenal: I've helped many men into $50 a week B l e Fat JOBS jou! jobs. Others being selected for training now. Drafting Toolsand Table furnished. Get ready for big business improvement. Send for advice and my PAY RAISING PLAN. Act promptly. Write me now. ENGINEER DOBE 1951 Lawrence Ave., Dept. 23, Chicago Electric Fun with 110 volts! How to make arc lights and furnaces, motors, obedient lights, alarms, and 195 other practical, mysternieus and amusing de- vices, Hook clearly explains how to do i each stint. Postpaid $1. Experiment ARC FURNACE ondinventors catalog free. CUTTING & SONS 33 D St. Campbell, Calif. FINDGOLD Guaranteed With Guggenheim Guggenheim Gold Detectors NEVER FAILS io detect gold and silver anywhere. Used by Tourists, Prospectors, Boy Srouts, men and buys everywhere to locate lost jewelry, buried treasure, rich gold pockets and mines. Many recent fortunes made by gold seekers. Sonora prospector located $2000 in gold nuggets. Send $1 for small size, $1.50 std. size, or ¥3 for profes- sional size in Jeathercase. and literature, 10-day maney refund guarantee, GUGGENHEIM EQUIPMENT COMPANY Dept. 3G-C, 156 Montgomery St. San Francisco, Calif. ms: Thank You far Mentioning Modern Mechanix and Intentions for March When Writing to Advertisers 8bitD ownload.com

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Would you be satisfied with a a $20,000 a year income? Read the answer in The E echnoerats’ Magazine 15 CENTS i st i F THIRTY MILLION OUT OF WORK IN 1933- © OR , 520,000 A YEAR | INCOME FOR « EVERY bit FAMILY— NOW ON SALE PRICE 15¢ Listed below are a few chapters of this re- markable magazine: Technocracy—a Bloodless Revolution. The Price System. Machinery Threatens Our Civilization. Secret Inventions which could ruin in- dustry. Where Are Our Jobs? Technocracy as a Government. Send in this coupon at once if your news- dealer is sold out— ee Ee i ee ee PEED eee ee eee eee eee Graphic Arts, Inc., 529 S. 7th Street, Minneapolis, Minn. Inclosed please find 15c (coin or stamps} for which mail me at once a copy of your "The Technocrats' Magazine.” Name... riversa 6 eee ee Bh ee ate eee Tek oro ewe eee kk tere erreeetn i EELEE ETEA EEEE TEREE TEETE TEREE E + Thank You for Mentioning Modern Mechanix and Inventions jor March When Writing to Advertisers Become a Chief Accountant, Auditor, or Comptroller The accounting department is the heart of any business. Here are gathered, corre- lated and interpreted the facts about every phase of the business. Here is determined the management of money—the life blood of the business. That is why the account- ing executive is an important executive ~—well paid, respected, consulted by his Superiors—tin an unusual position to know and to grow. You can now qualify for one of these positions-—at home, in your spare time, and at low cost. You can prepare yourself by the very same training which enabled 1,150 LaSalle students to pass C. P. A. examinations—and thousands of others to become executive accountants. You’ learn quickly because expert C. P. A’s. per- sonally coach you. You learn thoroughly because you study under the famous LaSalle Problem Method, actually hand- ling and solving the problems that face the accountant in business. You can begin at any point in account- ing to which your knowledge qualifies and o as far as you wish. Post Graduate lectives prepare you for the C. P. A. examinations or for accounting special- ization in any field of commerce. Aninteresting 64-page booklet, "Accountancy, the Profession That Pays," analyzes the various fields of accounting, describes the problems and opportunities in this growing profession and tells how you may qualifyfor success in it. This book is free. Ask for it by writing—today. LASALLE EXTENSION UNIVERSITY The school that has trained over 1,150 C.P.A.'s Dept. 3493-HR - Chicago, III. Gentlemen: Please send me-—free of all cost or ob- gation—your booklet on “Accountancy, $d the Profession That Pays," and full in- 2 formation about how I czn prepare for ? success in executive accounting. POUOS8.. cease oo ws oe ae es Ke Seem 3 Position. . Agel... MU Bk FromOne Blade/ Greatest Seller tn years A $1.00 Hone omy 50c | Superior tọ any on market. What a seller! New razor blade sharpener, tak- ing country by storm. Not made of glass, . fibre, celluloid, etc., but the finest abra- sive obtainable which is absolutely essen- tial for the sharpening of Steel. Puts a hair splitting edge on the dullest razor blade—any make—in few seconds. Our agents—salesmen—distributers—make big money HCE stat: WRITE AT ONCE! You are losing money by delaying. See the Goodrich Hone. Use it and sell yourself. Don't put off writing. Act now! SAMPLE 25c. One half dozen $1.00. 1 doz. $1.80 Goodrich Manufacturing Co. 53e- p-25°O W- MADISON 8bitD ownload.com

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Cut holes into F> Se a the masonry with os a cold chisel, insert ty bolts with heads in to form studs, and tamp remaining open spaces 1. Let the Smooth- On harden, then slip the brackets, cleats or uprights over the studs and fasten with nuts and washers. Use this method to anchor Each attachment is mounted on a mandrel and ia in per-

fect alignment. Tochange attachments, merely loosen handwhee] and slipinto draw-in collett. List price $4.00. . Send $3.00f ot Master Bench Head Special Offersend 3: or C.0, D. Wewillsend you FREE one 4’’x 34"all-purpose grinding wheeland 4’ buff mounted on separate mandreis. Write for booklet. WISCONSIN ABRASIVE COMPANY Why Colonial Houses Are Popular (Continued from page 130) terns. This gives you a decided price advantage, being able to buy from stock what in the old days was made by hand and beyond the reach of the modern average pocket book if made by hand today. I have selected two bungalows for this issue in Colonial design. No. 5-W-33 planned for a 45-foot lot offers two bedrooms, a bathroom, din- ing room, kitchen, large living room with fire- place on the first floor. Stairs lead to storage space above which can be used for added sleeping quar- ters if desired. The house is frame construction, siding ex- terior, shingle roof, and has a full basement. Dor- mer windows add much to the pleasing appear- ance, as do the blinds. The cost to build? A pres- ent day price range suggests $5500—perhaps more and perhaps less, depending upon where and how the house is built. It is a sound plan and the style as I have said will be permanent. Plan 5-W-J is a four-room equipment with two bedrooms at the rear of the house, a large living room across the entire front of the house, a kitchen and bathroom al]! on one floor. There's a fireplace and also porch which can be enclosed or open as preferred. Space above may be reached through a hatch in the rear hall. This house is frame con- struction, siding exterior, shingle roof and has a full basement. The cost should be considerably less than $5000 at today's prices for materials and labor. Listen to Police vs. Crime on Radio (Continned fram page 110) Wave- Frequency length (Kilo- Call (Meters! cycles) Letters Location 123.8 2.122 KSW Berkeley. Cal. WM) Buffalo, N. Y. KGPE Kansas City, Mo. KGPG Vallejo, Cal. WPDW Washington, D. C. 124.) 7.416 KGPB Minneapolis. Minn. WPDS St. Paul, Minn. 324.2 2,414 WPDY Atlanta, Ga. KGPS Bakersfield, Cal. WEK Belle Island, Mich. WPDX Detroit, Mich. WRDR Grosse Point Village. Mich. 324.2 2.414 WMO Highland Park, Mich. KGPA Seattle, Wash. WPDA Tulare, Cal. 175.15 3,712 KGPJ Beaumont, Tex. WPDB Chicago, I. WPDC Chicago, III. WPDD Chicago, Ill- WKDU Cincinnati. Ohio KVP Dallas, Tex. KGPL Los Angeles, Cal, KGJX Pasadena, Cal. WPDU Pittsburgh. Pa. KGPC St. Louis, Mo. 189.5 1.574 WRDS E. Lansing, Mich. WMP Framingham, Mass. KGPY Shreveport, La. 5+ & 10+ COUNTER GOODS

eon CCE BU ee | _faymons. BRAND hy Call on dealers—demonstrate World's greatest line 1 unter Card Gooda: Aspirin, complete line Razor Blades. Mercurochrome, Peanuta, 65 big, new je kea? profit makers. Flowerful. pelf-selling displays. H, Big profñte for deslera and you. Permanent. repeating busines = =- LL. Lit fo start. Send for Bi Paros FREE Catalog.

ORLD'S PRODUCTS CO. Dept. 8503 Station A Milwaukee, Wis. Dept. 3814 Spencer, Ind. wo mps 138 Thank You for Mentioning Modern Mechanix and Inventions for Marcek When h riting to Advertisers 8bitD ownload.com

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‘“Penguinette’’—Power Puffmobile (Continued from page 104) the size and type of wheel shown in the design. I have seen too many fellows tackle things like this using scraps and odds and ends gathered from Java to Timbuctoo and then crab because the whole affair was a disappointment. There- fore I explain why wheels. as being a most im- portant element, must be intelligently selected and rigidly installed. The matter of suspension is my own idea, and I'm proud of it. A U bolt is run through one side of the axle beam and bolted topside and underside. Then 212” from the underside this oe. bolt is bent and the axle, through which a 33” plus hole has been drilled, is slipped on. This hole and pin act as a trunnion which allows a teeter totter motion to the axle. The axle is then bound tightly to the axle beam with shock cord, and a guide pin fastened to the axle which will keep the stub shaft laterally in line. Thus by this device resiliency of proper degree is obtained on the axle shaft, and the car made very easy riding. More, the tension is readily adjustable by tightening or loosening the cord. This then completes our chassis and wheel suspension. Next comes the matter of steering. Steering In order to keep the car frame at the same level the steering trail fork has a right angle bend in it running up through a collar at the apex of the frame. The detail in Detail 2 explains this, while in Detail 1 the wheel and axle construction mentioned above is clearly depicted. The controls are the regular pedal controls such as any airplane uses. Piano wire will! be found the most usable tension cord to string from the pedals to the rudder bar. Seat The seat, which completes the car, is made of simple boards, nailed as previously described with 6 D nails when finished, and the shock absorbers installed on the axles and wheels, the chassis is complete. Power Plant Now for the matter of the power plant. The mounting of the propeller is cared for through a simple double N strut made out of 14” by 114” strap iron. Two A frames are bent up, and drilled for the bottom holes in the feet, and for the jack- shaft holes at the apex of the A, which should be about 8" across. The feet are bolted, and secured with 4" long .g° Carriage bolts. Next the jackshaft is fastened on. This can be any jackshaft such as are sold by the Driver or the Delta people. I believe the one I used was a "Wallace." It cost three bucks with both bear- ings, and thrust collars and mandrel plates. Cheaper than you could have it built, and it has oil cups. Worked very satisfactorily. When the jackshaft is bolted down, the frames will be in line and will need but slight pressure while a mechanic welds the N piece in the sys- tem. The minute the weld is set the shaft mount- ing is complete. All remaining is the placing of the motor and the securing of pulleys and belts with which to drive the prop, and the prop itself. (Continued on last page) i Pr i a e = LEARN N in CALIFORNIA epr ora E RÁDIO TALKING PICTURES In just a few vears, Radio has become one of the world’s leading industries, Talking pictures have brouecht new life and opportunity to rhe Movies. Now. Television is here with a promise of growth ata ancl as Sf o yrepit it ramnar hu a Mamie to Los Aedes and learn tbese fascinating Taes. BUT— YOU MUST BE TRAINED Times are ketting better. The worst of the depres- sion is over. Thousands of new Jobs will call for TRAINED MEN. Will you he ready? Rexardless of the times, the Trained man wins, Hea! ways has and he always will, Take that factlax a pude ang your future ts assured. SPECIAL NEW COURSE—RADIO BROADCAST TECHNICIAN Special course wiven to students who enrol! imme- diately. We Broadcast over our own station and EARN Room and Board Th. of our students me earning their living expenses while attending schoot HOW We help you pget a je ťÞtiopay living expe ‘nses white learn- ing. If you are shart of money, Write and oy vour problem. Woe alse al- low your Coach Railroad Fare te Los Angeles. Send for Free Book You will find the facilities here a positive revelation Get our new book, whick wives you all the faete. rhe obligatjon--SEND COLTON also by remote control, AT ONCE, NATIONAL RADIO ct ELECTRICAL SCHOOL: los An Dept. MMR 3, 4006 Figueroa St. Send Book ald) tut) details of Courses. NAME ADDRESS ccir 56 00.9 urani reed aesa COLT Y Gs cantvwtt nea aha STATE...... SSFOR PINS: -RINGS*{ 25 h SS Class pins —any letters, an B vida year, any ee aie 12 . G more, 25¢ each; 1 to 11, 30¢. Gold plated, 40c; sterling, 45e. Class rings, medals, ete. BIG CATALOG FREE. METAL ARTS CO., Ine., Factory 45 Rochester, N. V. 29x4.40-21 A AA Piei NEW DKY Dni LOW PRICES DNA YoucanrelyonChica- EEUNA go's oldest, moat reliable rub- YO ber company for tire mileage at (Ryo iowest Rost lnereasing thou- “N 5and8 of satisiedmotorista allover the A. prove standard brand tires, reconstructed by Midland arebest. Long, hard service on rough roads guara ntecd. p © Ces O00 00 =O ewe mW ome “æ Demat pei prah jen teh Ps fd pan jel pam $ à KE Ea eate baa _ si Bh QW; 33x5 3.25 —Aljl Other Sizes— | HEADLIGHT ALL TUBES NEW | METET TIRS GUARANTEED | te ee ORDER FOR 2 TIRES o% ap Send $1.00 De osit t with each tire ordered. {headli tht wert Balance C. pol f you Bend cash in full Í pierces bower: deduct 5%. You are e da year'sserv- Unichi arimana gafa ice or replacement at price, Order today. MIDLAND TIRE & RUBBER CO., WOINNNNNNNNNNNNNNE NOCOOOSWNOMHAN N m m O COUMNUMUNUNOSUS WOU" De ped eel Ba feed eed pet 9 N © B Dept. 2823 1000-10 West Sixty-Third Street, Chicago, Illinois | 7 5 —— SSD RF e Thank You for Mentioning Modern Mechanixand Inventionsjor March If hen H riting to Advertisers 139 8bitD ownload.com

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LT eee “ELECTRICITY IN 12 WEEKS AT COYNE The great Coyne Shops in Chicago have a world-wide rep- utation for training men here in Chicago in this big-pay field in only, 12 weeks. Then they get behind you to assure success by giving you lifetime employment service. By ray new plan. YOU ean take advantage of their wonderful method of learning-by-doing NOW—no need to lose time and money while you strive and save to raise the neces- sary tuition. vw WILL FINANCE YOUR TRAINING Come to Coyne at once. Get your training. Then startpaying mè fop your training a full two manths after you graduate, and take a full tën months to complete your payments. If you will write to me at once I will send you com- plete details of this sensational new plan. together with the BIG J FREE jllustrated Book telling all about COYNE and how many earn While learning and the train- ing you can get there without book study ê Py or useless EE, theory. ah ' President SEND NOW FOR FULL DETAILS! Mr. H, C. Lewis, President, , i J Dept. 33-53, 500 S. Paulina St., Chicago, TH. i i Tell roe how you wilt finance my training at COY and send p= the BIG FREE [llustratedbo 1ELECTRICITY. J eater ee eee eee twee serene hae eer eee RRR ere ee BAB REEE aeteccneanicorendeereeenrieneoun EETRI I Į CITY. a aperiat Siae ro Rii BTATE.. 0.o Household Equipment Need Repairs? Get your copy of "Handy Man's Home Manual" | 50 Cents at All Newsstands. — Fortune Making Ideas for Inventors (Continued from page 128) of steel wheels mounted in such a manner that when a knife was drawn between them, it would have a new edge cut upon it. Millions of these little things sold. Now this was a very efficient sharpener but there was one thing that it could not sharpen for the simple reason that a bevel edge was needed. We refer to a pair of shears. What is needed is a little thing that will sell for a nickel in the five and dime and which will, by simple manipulation, place an edge upon such an instrument. Specifications: The bevel edges of the shear blades should be preserved perfectly by the device and it should be borne in mind that the little tool should be so simple that it could be manipulated perfectly by any housewife. If it can be made of pressed metal, so much the better. In keeping the price of the gadget at ten cents, a large market is assured for it. Exploitation: Should be patented in all of the leading countries of the world and should be sold entirely on a royalty basis. Self-oiling Lock Locks, when they are exposed to dampness and the weather, often become rusted and fail to per- form as they should. As a matter of fact, many cannot be opened if they are permitted to stand unused for any great length of time. What is needed is a lock that will always work easily, never rust no matter what the surrounding con- ditions are. Should there not be some way in which oil or grease could be stored in such a lock in a manner which would assure the lock a long and useful life? Specifications: Should add but a few cents to the cost of a lock and should in no case permit oil to reach the key. Exploitation: Should be patented in every large country of the world and should be sold only by license and royalty. Supplying Water to Hot Air Furnaces On practically every hot air furnace in use to- Write today for FREE BOOKLET, | day, the owner will find a small water compart- HOW TO OBTAIN A PATENT = and ment into which water is placed. This water is RECORD OF INVENTION—cr send Draw- slowly evaporated and carried with the warm air ing or Model of your Invention for Examina- to the registers. This is done to keep the air in tion. a house moist. From a health standpoint it is Promptness Assured with Best Results very necessary, but few people use this feature on their furnaces for the simple reason that they MILLER & MILLER are either too lazy to fill the pan with water or else they forget to do it. REGISTERED PATENT ATTORNEYS Now what we need is an automatic method of accomplishing this. Naturally the little water tank, which usually holds one or two gallons, should be connected to the house water system and some system, guided perhaps by a float, should keep the tank filled. Specifications: Should not add over five dol- lars to the total cost of installing a hot air fur- 1006 Woolworth Bidg., Dest. B, New York City 203 EARLE BLDG. WASHINGTON, D. C. Please send me your Free Book, "How to Obtain a Patent," and your "Record of Invention" form. NAME. nace. There must be no danger of the device flooding the cellar. ADDRESS... Exploitation: Inasmuch as central heating plants are used in the United States much more than they are used in Europe, the device should be patented only in this country and Canada. ae an SD 8 # el Thank You for Menticening Modern Mechanix and Inventions for Marc* When # rittng to Advertisers 8bitD ownload.com

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Here’s An Easy Way! —to bring you a fine cash income! Without taking any time away from your job. Pleasant easy work at home, Decorate beauti- ful giftwares the Fireside way, needed. No tedious study. No memorizing. With ee Three Simple Steps sent you by Mon- Sieur Petit the great artist; — Director of Fireside Industries, it is just fun! We want men in ever community. Fireside Industries, 142-¢ Dept. Mich. Adrian, Fortune Making Ideas for Inventors AnA" An Attachment for a Gas Stove Those who use gas either for cooking or for heating are constantly being annoyed by the con- densation of moisture on windows, walls and even furniture. What is needed is a simple attachment for a gas stove that will absorb the larger per- centage of this moisture or at least carry it away. Our large gas companies would give a great deal for an invention of this kind, providing it were simple enough, for a large number of people do not use gas for this very reason. Specifications: Should be cheap and simple and should not cost over five dollars installed. spare moments. No previous training required. No special ability Be the first! an’ Extta Money Quick | Exploitation: Should be patented in the United | States and Canada only where gas is used to the | largest extent. Rattling Windows What we are trying to do in this department is l to keep our eyes open for the little things that | make big fortunes. It is not always the big, com- plicated ideas that make the "big" although many of them have. It is the little and often unexpected things that pile up the bank account. All of this by way of introducing the subject of rattling windows. Every house- hold has one or more of them. Why then, not develop a small spring of some kind that may be slipped in place between the window and the frame that will keep the latter from rattling? Now it is obvious in the case under consideration that we must not only be able to slip this spring in place so that the window will not rattle, but that we must also be able to extract it—quickly and easily when we wish to lower or raise the window. This puts an altogether new angle on the problem. Specifications: leading countries of the world and should be made to sell for ten cents. Should be made of non- rusting material, preferably pressed metal. Steel Handled Tools We are living in a metallic age. Everywhere steel and iron in sheet form is replacing the older methods of wooden construction. Now there is a need for sheet steel tool handles for axes, ham- mers and the like. What is needed is a handle that will not break and that will be light in weight (Continued on page 142) money, | Should be patented in all of the | Begin Right Now! Thousands are making Fireside @® decorations—making from hundreds to thousands of dollars and apple their own work besides. e supp Ger with everything you need. Biz A Ne C omplete kit WITHOUT ACOST. It's acinch! Your § ee is assured. FREE! inne Fill out and maii dustries E coupon at once. | Bep adhan, Mch. . Mibol it eni i a ‘me your wonderful Free Rook in 3 ligation it brings ou wonderful colors. This does not put me under auy I ireside Book in l obligation. colors. Explains Į Name... everything. fF "7777 T rrr teers etter n ences j Act Now Í Address... nannan aaan aaan PATE NTS BOOKLET FREE HIGHEST REFERENCES PROMPTNESS ASSURED BEST RESULTS Send drawing or model. WATSON E. COLEMAN 724 9th St., N.W. Patent Lawyer Washington, D. C. WHY DON'T YOU SEE OR WRITE US TO PREPARE AND FiLE YO UR PATENT. r Address........ WE ALSO SELL IT FOR YOU, HERE OR ABROAD INTERNATIONAL PATENT COMMERCIALIZATION CO. Inc 55 West 42nd St. New York full information 1234 BROADWA ad | anc literature REGISTER YOUR Protection with- TRADE: MARKBY eE NEW LLORUN out obligation. WHAT IS YOUR INVENTION? Send me a simple sketch of a mode! for “Howto Build 20 Boats a SSEM DETE in this issue WITHOUT EXTRA CHARGE ATENT Br INATA | 6.0.06. 8 YOUR IDEAS abeant baitest REG. PATENT ATTORNEY PROF ENGNEFER | Name CONFIDENTIAL ADVICE—DO IT oe l See full page ad WONDERFUL Pays for itself in one job! Needs no pump or pressure system—no stove~— no char- coal—no separate blow torch. Paris an hour at less than 4 cent for gasoline. AGENTS* OFFER Write for Special Offertoagents. The Justrite is an ideal proposi- tion for either main line or side line — full time or spare time. JUSTRITE MFG. CO., 2047 Southport Avenue. Chicago, III. IS Thank You for Mentioning Medern Mechanix and Inventions tar March R hen Writing to Advertisers 141 8bitD ownload.com

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I | | =a | in| D] ae Leet al | ene CN haa ed | mal E al í on approval. Just mail the coupon and we'll send you a set of these remarkable auto books, just Off the Press. yhether you are a mechanie or helper, expert or g-Pprentice, auto owner or driver, if you're in- terested in knowing all about automobile mechanics, then take advantage or this FREE OFFER. DON'T SEND A PENNY ! A better job—in the gigantic auto industry. ponti PAY—a chance to go into business -—— - for yourself and get a share of the NUE® AN YOU FIX IT? profits are waiting for any man aa even halt wonder -tell step tries to Improve himself. Learn Auto Enoi- Ep HOW por inte Out’ peering with these wonder boohs a new ‘4 piay h? differential--to -without studying or memorizing. Simply ene MING «ob eto put Use the JIFFY INDEX to look un the answer see TIMING antl) on en- to any. auto problem Built eleven of ine trouble and then the America's greatest automobile engineers, and ewest furrovements fully Written wn simple language so YOU tan un- vered. Equal to a com. derstand it] , , lete trade course at less FREE! Privilege of consulting Auto- an a fourth the cost. mobile Engineers of American Techni- 6 Big Volumes cal Society for one year without cost m OU mail coupon immediately. AMERICAN TECHNICAL SOCIETY Drexel Avenue & 58th Street Latest Edition Dept. A-3320, Chicago, Hi. 500 pages, 2000 rlustra- vuo Wiring diagrams, etc., cluding Aviation Wlotors’. eLuxeedition, gold-stamp- d flexible binding. .MERICAN ee ence Be” Chicago, Ili -3 è t a4 5 Uy 3 : pie A AITTEN LATE new 6-volume editien of your AUTO BOOKS. 1 will ay the few cents delivery charges only, but if I choose to. I may F*8rD them nrarar rr. nd pay the balance at the rate ef only $3 a month. until $24.80 i8 paid. f Please nclude free consulting membersnip 8s per you: vuo: awws. lame n. aeorsssrressnriserenete das Address ....-- reece imployer's Name....++.-- o: bcSegueendnaneoeeease er citer eedawes ss Smployer’s Address... +e eae peu e seb een eae reeeeer Seat ae eh er ow EERE ETOH CSS HES EEE SHR TP RRP HS FOR BETTER PAY L Focrran and up. I'll train a number of geleeted students on practical WOTE as Draftsmen, Or improve your present job to get a raise. Drafting Toola and Table furnished. Write for free Pay Raising Plan now. ENGINEER DOBE, 1951 Lawrence Ave., Dept.23,Chicago Do YourOwn Broadcasti . NEW {933 MASTER MIKE WITH RADIO ox Nd friends. A million doliars’ worth me J MIKE RING AND HANDLE of fun. Easy to connect. Fits any radio. A real microphone- -not a toy. Mailed postpaid, Reproduces your own voice through your radio. Fools your J > only 95c. Send today. . MASTER MIKE CO. 4610 Grand River Detroit, Mich. © in [0 Weeks PAY for TRAINING AFTER YOU GRADUATE! GET DETAILS OF MY AMAZING OFFER! Qa pp ma- tae jobs in Service Work, Broadcasting. Talking Pictures: Televizion. Wireless _ctc. bv ten weeks of practical Shop work In a GOYNE Radio hops. PAY FOR YOUR TRAINING AFTER YOU GRAPUATE. Free Employment Service. WRITE TODAY lor our BIG FREE RADIO and LEVISION BOOK. RADIO DIVISION. COYNC ELECTRICAL SCHOOL SOO S. Paulina St. Dept. 33-1H Chicago, Hhnois HOW TO BUILD 20 BOATS! See page 35 =o Colt 142 ~ ' Fortune Making Ideas for Inventors | | (Continued from page 141? — gs light or even lighter than wood now used. This type of handle would offer a much better opportunity to fasten the tool to it than is offered by the wooden handles now in use. Specifications: Should be made hollow in such . way that it would rival wood in cheapness and yet have more strength. It should also have a certain amount of resiliency or "give" to prevent the handle from breaking when a smart blow is struck. Exploitation: Should be patented in all the countries of the world having patent laws. A Modern Hair Dryer The thing that I am about to mention is so obvious that I am really surprised that it has not been thought of before. What I have in mind is a heating attachment (electrical in nature) that could be placed on the blower end of a vacuum cleaner (through the medium of the tube which is used for blowing the dust out of corners) and used for drying hair. This would offer a really fine and practical method of drying and one that would be just as efficient as those used in the beauty parlors. The vacuum motor would blow the air out of the end of the hose and the heat- ing unit, which might be the same as that used in small heaters of the bowl type, would heat the air as it passed. Specifications: Should be cheap and made in such a way that it could be attached to any stan- dard machine. If this unit could be made to sell for a few dollars, a ready market of over five millions would be available for that is the num- ber of vacuum cleaners in use in the United States today. Exploitation: Should be patented only in the United States and Canada where these machines are widely used. Bridge for Electrical Experimenters (Continued from page 111) In wiring, use No. 18 insulated wire to keep all undue resistances out of the circuit, which is given in the drawings. Finish off the box and give it a coat of stain or paint and you will have a nice looking in- strument. The principle of the Wheatstone Bridge is that four resistances are in a circuit as shown in the diagram; one of them being unknown. Switch on the current and, if all resistances are alike, no current will flow through the galvanometer and its needle will remain quiet. If the unknown resistance varies from the others then the rheostats A, B and C will have to be adjusted until the needle shows no deflec- tion. Knowing the values of A, B and C you can then use the formula A over B equals X (un- known) over C. Taking the scale readings of A, B and C it will be easy to determine the resistance of the unknown X. Any text book will give you the various methods of determining unknown in- ductance and capacity values too lengthy for this article. Ig. Thank You fg, Mentioning Modern Mechanix and Inventions fjor March Ehen Writing to Advertisers 8bitD ownload.com

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Parlor Magic With | Cigarettes ( Cake aan. page 69; holds the even pile while the spectator has the odds. Strange as it may seem, there is no ex- planation—you just do it, that's all! Consider: You can cut the circular trade mark from a Lucky Strike, moisten it with saliva, and paste it over the Camel trade mark so that the gimmicking can never be noticed, as shown in the progressive pictures of the operation. Does that suggest anything? No? How about this: The performer takes a number of cigarettes and places them into a hat. He takes a single cigarette of another brand and places it, also, into the hat. He stirs the cigs around. When the contents of the hat are brought forth, one smoke at a time, all of the cigarettes are found to be of the same brand. Of course, no one ever guesses that the odd Lucky Strike (really the doctored Camel) is prepared. It looks so natural. Neither does anyone see you remove the trademark and roll it between your fingers, all of this being done within the hat or your pocket. If you like manipulations, try a little sleight shown in the illustrations to the upper right. The important movement is pictured in Fig. 11, where the right hand fingers are brushed slightly over the left hand fingers, causing the cigarette to spring back into the right hand where it is re- tained by slightly compressing the fingers. The subsequent reproduction of the smoke from the air or the pocket needs no explanation. Lifting Four Smokes Sans Fingers Can you lift four cigarettes with a matchbox cover? And this without touching the cigarettes with your hands or pushing the smokes over the table? By placing the mouth over the open end of the upright cover and inhaling strongly, a par- tial vacuum can be created, sufficient to hold the cigarettes in place until the position shown in the photograph can be assumed. Clever, no end!

Hobby Department (Continued from page SO) 5c blue, and 8c orange. A new 60c apple green stamp bearing the portrait of Emilio Castelar has been issued by Spain. Three lithographed examples from Peru give evidence of having been derived from ancient Inca sources. They are in 10c, 15c, and 50c de- nominations, printed in purple, lake, and sepia, respectively, and bear the inscriptions “Parakas,” “Chimu,” and “Inka.” Russia is represented with a series of five pictorials. Lenin addressing a crowd ornaments the 3 kopec violet, while the 5 kopec brown shows a view of Moscow's famous Red Square. The Dnieperstroy power plant, whose completion has just been celebrated, is depicted on the 10 kopec blue. This gigantic engineering project is the one which has been taking shape, under the guidance of American experts, for the past five years. A quiet farming scene is shown on the 15 kopec green, while the 35 kopec gray purple bursts to an allegorical conclusion with light rays pointing to the word "Lenin." Ot Thank You for Mentioning Medern Mechanix and Inventions for March Bhen Writingto Advertisers

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We also supply all types of motors from 1/100thH. P. up to any size for any veltage or kind of current. Special and odd voltages and frequencies our spe- cialty. Lft us know vour requirements. OUR PATENTED ELECTRICAL WINDING MECHANISM CONVERTS ANY CLOCK INTO AN ELECTRICALLY WOUND CLOCK The striking and chiming mechanisms. as well as the time mravementinither weirht driven ar cnring olackes gre ener- xized electrically. No hand winding of anv kind required. Electrifying a tine antique clack by our method does nat spol It as an antique--you simply add our mechanism. Build Your Own Electrical Grandtather'’s Clock Most Accurate and Finest Observatory Type Smal) installment payments. Clock can he easily and quickly asse mend We supply all parts. No special touls Necessary. Send $1.00 for Hilnetrated indteurnion Buok tet, 5 ‘ing complete de tails. ($1.00 deductible on lastpayment. } Jescriptive circular free upon request. Headquarters for synchronous, electrically wound. spring and weight driven moveme nts of every kind “and type. Everything in clocks and clock controls START YOUR OWN BUSINESS

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‘Speed- PLANKING CHINE LOG FLOOR DOUBLE PLANKING EAM BATTENS L. W. FERDINAND & CO. 597 Albany Street, Boston, Mass. Makes FLOODLIGHTS SPRING RATCHET ee dd of AUTO HEADLIGHTS | This amazing invention eliminates all the canes of night driving. Lights both sides of the road. ierces fog, rain and snow and does not blind the eyes of the approaching motorists. FLOOD LITES an be installed in a jiffy by anyone. They fit all standard size bulbs and do not wear out. Exclusive cooling feature prevents burning out of bulbs. They are worth many times their retail price of only T5c per set to any motorist. ‘Liberal Commissions te Agents and Distributors. AGENTS AND DISTRIBUTORS WANTED Make money supplying the demand for this automotive necessity. Every car owner a prospect. Write for FREE information. Sample set on 10 Day Free Trial 50c—3 pair for $1.00. Postage prepaid. Satisfac- tion guaranteed or money refunded. SEND TODAY. FLOOD-LITE REFLECTOR CO., Dept. 6213, Racine, Wis. S J EAMOUS , CARDONIS Teo A Nick Nichols ae- Cartoon Instructor of Chicago Academy of Fine Arts LARGE COOLING FIN Art Director for Associated Editors' Newspaper Syndicate Creator of —The Adventures of Peter Pen (the Bottle imp) —Just Supposin’>—Young Upstarts—Otto Watt—etc. | THIS PORTFOLIO CONTAINS—Twenty Lessons—Hun.- dreds of Drawings — Telis You All My Secrets-— How to Draw Funny Papers—Comic Strips—Pretty Girls = etc, HOW and WHERE to MARKET, YOUR DRAWINGS seo) 0) eee el ee Pree ltl tg nies ST. © © cHicaco ILL BETTER BOATS at Lower Prices Motor Boats $495 and up FULL LENGTH SPRAY RAILS — SOMETHING NEW A TVT Family Outboard motor boat with full length TWO Big Factories 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 LARM pega: sae af rs Fe EE WISCONSIN either place) NEW YORK "Handy Man's Manual”... At All Newsstands boats are made watertight with Jefiery's Waterproof Marine Glues TENACIOUS — RESILIENT — DURABLE Used on craft large and small for more than 80 years Send for free booklet, "Weak Spots" How to Build a Kyack (Continued from page 118) applied before the covering operation is started and the boat is removed from the horse. The strips of paper are allowed to overrun the clamps and the whole side is trimmed with a safety razor blade after all covering is completed. The molds must be removed before the deck is applied. The cockpit is framed as shown on the plan and the deck fabric is stretched from clamp to clamp, lengthwise to a reasonably tight fit, then given three coats of clear or pigmented airplane dope. Around the edges of the sheer line a piece of pinked airplane tape is doped down to the deck and side to cover up the raw edges of the deck and side and the guard of ash is fastened through the paper and capped with a piece of duralumi- num molding as shown. The outer keel is made in a similar manner and fastened through the paper as shown. Stem pieces of a section similar to the guards should be bent up from ash and fastened to the stem pieces as shown in section. After the paper is securely fastened to the frame it should be given two coats of varnish inside before the deck is fitted and when the deck is fitted the whole outside should be given two coats of varnish. After varnishing the outside may be painted to suit the builder's fancy either in the style used by the Esquimaux or in the conventional colors of the modern canoes. Each coat of color should be sanded down and the outside will soon take on the high gloss so neces- sary to speed through the water. If the kyack is to be used in sheltered waters no finish around the cockpit is necessary other than a roll of imitation leather stuffed with horse- hair or kapok similar to the padding of the rim of an airplane cockpit. For open water work the cockpit should have a coaming two inches high made by bending up a ring of three turns of 1/16" veneer and capped with a half round mold- ing about a half inch wide. For summer work the only thing necessary to keep the water out will be a sleeve of canvas as shown on the plans with a drawing string worked into the top and the bottom. This sleeve is drawn tight around the cockpit coaming and around the waist of the paddler which will keep out almost any water that will sweep over the deck. For winter and fall when the winds are biting and cold spray is flying the real Esquimau parka will be neces- Ree Thank Youfor Mentioning Modern Mechanix and Inventions for March When Writing to Advertisers 8bitD ownload.com

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How to Build a Kyack sary. This is made by first taking apart an old coat; and, using this for a pattern, the various parts are made from light canvas or twilled muslin. A collar is added as shown as is also the shield inside the collar. Eyelets are inserted in the throat for lacing and drawing strings are worked into the sleeves and waist. It will be a whole lot more comfort- able if the sleeves are quilted around the wrists where the drawing strings bear on the wrists; this will also insure better watertightness. For very cold weather the parka should be given a lining of muslin with kapok quilted between to provide the insulation needed against the cold. A blanket of muslin with kapok quilted in it will keep the paddler's legs warm. All quilting should be done after the outer fabric has been water- proofed with a paint whose formula is shown on the plan. There are many tricks to handling a kyack and no one without a little canoe experience should attempt it. To the experienced canoeist the kyack will prove an interesting diversion and it may be stocked with all sorts of supplies for an ex- tended cruise. I have seen the Eskies roll these craft over and over in exhibitions and to the white man this appears as only a stunt but Willie Eskimo often has to resort to this trick to escape the onrush of an enraged bul! walrus. He cannot turn his kyack quick enough and if he could there is always the chance of getting caught broadside so he simply rolls over and over across the water to a safe area. This is one of the rea- sons why the Esquimau does not use the double paddles feathered as do the devotees of the double paddle in civilized countries. He must ~ on the grip of both of his blades to do the roll. The rolling trick is easy to do after a little practice which should be indulged in on shallow water with an assistant standing by to help you if you fail to come up to complete the roll. It is executed by laying the double paddle alongside the kyack and submerging it as deep as the length of the arms will permit. By this time your weight has brought the kyack near to the capsizing point and over she goes. The uprighting operation of the roll is accomplished by swinging the paddle to the far side and with a downward sweep and a quick lurch of the body the kyack is righted. A rubber ball cut in half and slipped over the shafts of the paddles will form effective cups to catch the water that runs down the blades. For fishing operations a light anchor may be made as shown on the sketch and this is rigged off a ring bolt in the bow. A retrieving line must be run for half a boat's length down the main anchor line and fastened near the cockpit so that the anchor may be hove up from the cockpit as it is impossible to get forward to do this. Now for some don'ts on the construction. Don't forget to drill for all fastenings, the material is necessarily light and will split easily. Don't get the paper too wet in applying it as unfair lines between the ribs will appear where the pull of the paper becomes excessive. Don't apply varnish anywhere before doping except inside the boat where dope will never get to, dope is a good varnish remover but varnish will not affect dope after it is dry. roc Thank You jor Mentioning Medern Mechanix and inven | Students Individually Instructed ee. Se A A em iM M M a m a na > >» TTEA IN LOS ANGELES A FEW SHORT WEEKS AT NATIONAL AND YOU'RE READY FOR A BIG PAY JOB! For 27 years National hap quickly helped men get ready for goud pay jobs, steady employment in the profitable Ask for auto fields. More repairs new than ever before. Don’t worry about previous experience oY whether Sou're too eld or too young. We train you by “actual Show ? Free Auto Book methods on newest equipment--late model autos, Larg- est School in West, Profusely illustrated, Complete Practical Auto Instruction showing students at Course trains you in every br ing you to run your own shor worry about money. We'll help vou a a time job : explains each phase of training and tells all pout. our S pe- cialOferfor imme di äle enrollment. Mai] the Coupon. "Coach railroad fare Employment Servje e E graduates. allowed to Los Angeles. NATIONAL AUTOMOTIVE SCHOOL Los Angeles > Dept. M. M.A. 3, 4006 South Fig roa St. Send Free Auto Book and Special offer. WATE. 22522r2u ihe vecwbtanwes vents - dasa aaa a AGAT@ES 00000000 eee ee eee eee CHY penseria ukeun AEAEE aN State... 2...2. -—for dozens Of after- dark auto emergencies SENT POSTPAID FOR $4 5Q after-dark road gangers. 1 = Mag rnet- Lite in your car. and Quickly attar bed with clips. Long cord permits you to take light to an art of the vay, Strong electro-~magnet base on the Jamp tastens light to any metal surface, regardless of paint or enamel, Tse for repair Work, ar as an extra bead- or tuil-light. Order one for your car now! Money back if not satisfied. Atlas Sales Co., Dept. M. z001 Chouteau Ave. St. Louis, Mo. Nọ More Cary a Easily Deaiers and agents; Write today for very al- Iřractive de- tails. ~HAENEL “100 SHOT” REPEATER : game. Blue or Nickel finish, shoots B. B. steel] shot. Weight 18 oz, Price with “00 shots Free - $4.95—£2.00 deposit on C.0.D. | Free Catalog-—Colts. Rifics, Binoculars, ete. i i S -95 Latest Model 1853 Haenel repeating ¢ pistol. Sturdy., massive construction, 100 hot magazine. Ų Powerful for small pasy vocking Jever, Accurate for target, HUDSON SPORTING GOODS M-52 Warren Street New York | 1933 FLYING MANUAL NOW ON SALE! m+ tions for March N hen H ritinglo Advertisers 8bitD ownload.com

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WHICH CONTROLS YOU? Science says that the chemical elements compos- ing a man's body may be bought for sixty cents at a pharmacy shop. But the real part of you is the infinite, creative power within—it makes YOU a living, vital being. By the proper use of this creative, sleeping force within you, you can DOMINATE YOUR LIFE and MASTER THE CONDITIONS WHICrt SURROUND YOU. The Rosicrucians have shown thousands of thinking men and women how to use this infinite power. Learn to direct the inner processes of your mind. This Free Book Explains The Roscicrucians wifl send the SINCERE SEEKER a free copy of the new book, ''The Wisdom of the Sages,'' which tells how you may become a student of these age-old truths. Address a letter (not 9 postcard of curiosity) to: Scribe F. J. U. ROSICRUCIAN BROTHERHOOD AM 2 RC SAN JOSE. CALIFORNIA Just a reminder—The Rosicrucian Brotherhood is NON-RELIGIOUS PAY RAISING Helps from an ENGINEER Man? men trained by me earn $50 a week and up in Drafting. Seewhat your chances are, No coat or obli- gation for advice. Just write me. Offer open to ali who write prompt- ly. Drafting Tools and Tabie fur- nished when youstart, Getray PAY į RAISING PLAN free. Write now. ENGINEER DOBE 1951 Law-ence Av. Dept.23, Chicago Write for free booklet describing ''87 Plans for Operating a Successful Business of Your Own". Make from $20 to $100 a week starting in spare No peddling or house-to-house selling. time at home. Booklet sent free, and without obligation, Write for your copy today. ELITE PUBLISHING CO. 214 Grand St. New York, N. Y. STOP Your Rupture Worries! g Why worry and suffer with that rupture any longer? Learn about my perfected invention. It has brought ease, comfort and happiness to thousands by assisting in relieving and curing many cases of reducible hernia. It has Automatic Air Cushions which bind and draw the broken parts together as you would a broken limb. No ob- noxious springs or pads. No salves or Plasters. Durable, cheap. Sent on trial to : prove it. Beware of imitations. Never sold in stores nor by agents. Write today for full information sent free in plain, sealed envelope. Dept. G C. E. Brooks Invertor H. C. BROOKS, 562-G State St., Marshall, Michigan | +t “Penguinette’”—Power Puffmobile (Continued from page 139) The Delta Manufacturing Company, which ad- vertises in Modern Mechanix and Inventions this issue, will be pleased to send you their catalog. In it they show belts and pulleys of all different sizes which you can adapt to your needs. We used a % h. p. washing machine motor which turned at 1750 r.p.m. A 1 to 2 reduction turned a 4 ft. 4" diameter by 2 ft. 6" pitch prop at 800 r.p.m. through a V belt, allowing a little for slippage. This would start a load of 185 lbs. crew and 150 ibs. auto and attain a speed of close to twenty miles an hour. The same size propeller should be used no matter what power, and the 8" Delta pulley should be used to drive the jack- shaft. With greater power, higher prop speed, one would have a job that started quicker and would attain a higher terminal speed. If the matter of braking is considered, it should be applied to the rear wheel only, the matter of attaining even pressures on the front wheels, and thus avoiding turning effort which would make for accidents, is a difficult problem. After all one will have the most fun with this machine on the open expanses of country road, or on the ice either as a car or a Sled. For actually serious service in the city, twe additions will have to be made which somewhat rob the car of its charming simplicity. One of these is the matter of a shroud for the propeller if you use powers higher than 1⁄2 h.p., and the other is the matter of some sort of nacelle to keep dust and horsefeathers from blowing up into your face. For a propeller shroud, since the motor may be started by pulling on the V belt, ordinary coarse mesh galvanized screening, such as used by contractors in grading sand, will be amen- able to soldering, and simple fabrication. A fuselage can be provided by using whatever formers and ribbands you desire, a la airplane practice, and when finished you will have your own interpretation of the latest fashion in wind machines—one we have worked out in order t9 prove its practicability and simplicity—and which for want of a more pointed name we termed “Penguinette,” which means an even more abbre- viated ship than a Penguin. She is the first car to be termed a “puffmobile.” And there you are. 442 Jig Sew? ` Pusziemaker’ Plus 12 Assorted Blades Equipped with WV-pulley for your treadle or motor. 15’’ Jong—a’’ a high. 642°’ table. All metal con- p Pn struction. Sent postpaid on rereipt of ` A $1.49. (Canada. $1.84.) C. 0. D.'s 25¢ extra. FREE booklet “MakeYonrOwn Jig Saw Puzzles” with every saw. "7 480 St. Paul Street J. & H. METAL PRODUCTS CO., Dept. 3, Rochester, N.Y, Quit Tobacco: Don't try to banish unaided the hold tobacco bss upon you, Thoueznds of mveteraibe tobacco users have. with the aid. of the Keeley Treatment, found it easy to quit. KEELEY TREATMENT FOR TOBACCO HABIT aay banisban crain folT over 60 years. Write today for FREE BOOK and our MONEY BACK GUARANTEE. Home of the famous Keeley Treatment for Liquer and Drugs. Booklet sent on request, Correspondence strictly confidential, KEELEY INSTITUTE, Dept. D-752. Dwight, IHinols Thank You for Mentioning Modern Mechanix and Inventions jor March W hen Writing to Advertisers 8bitD ownload.com

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This beautiful 100% i o PYROIL FILLING : Re STATION in a South- E on ern Texas city is a vivid example of what Pyroil Distributors are now accomplishing in all parts of the coun- try. The Se for the territory f a which this Service Sta. pE] tion is located joined [ the Pyroil ranks only four months ago with a smalt first order. Can any man look at the picture above and not be actually amazed at the unprecedented merchandising progress of Pyroil since its introduction through the pages of this and other magazines less than three years ago! Here is one instance typical of thousands . an ultra-modernly designed 100% Pyroil filling station. Aside from the above, the Pyroil Distributor for this territory has established Pyroil at innumerable other filling station and garage dealers and is now at the head of a large organization of sub-distributors. Pyroil is now on sale from Coast to Coast, Border to Gulf, throughout Canada and in many foreign countries DEALERS and the PUBLIC . .. World-wide sale, yet Pyroil has only begun to "go ARE PROTECTED IN THE ?/4¢es”. This famous product is succeeding because it fulfills its every claim. SALE and USE of GENUINE Simply added to gas and oil Pyroil instantly gives motors new life ; . frees valves, seals rings, reduces wear and noise, increases m PYROIL. power. Sheaths every metal part with a surface of protection which amrer e is actually self-lubricating in emergencies. Lubricates safely where Genuine Pyroil oils burn, freeze and wash away. Completes lubrication wherever oil is Patented in is used. U. S. and Pos- Pyroil is backed by a sound and successful organization with a far- sessions by W. V. reaching promotional campaign of national advertising constantly in Kidder, its inven- effect. (Se ee Saturday Evening Post, January 21, 1933.) tor, and is identi- There's a place in the Pyroil or- fied by the winged PYROIL IN WINTER ganization for every man who Pyroil Trade- honestly desires to make money name (Reg.) and Provides quick, easy one of the greatest opportunities of signature of W. J safety ; moaern . ana 1% TAKES Fe ENA PEA a starting and satety in “almost nothing” tO get started—at PROCESS j every abel. Sub-zero temperatures. once. Send theou on for a free co (Other U. S. and i p $ of the beautiful Pyron Rohe Pal See oa Pyroil sales in winter full facts, today. Manufactured, Pat- ending. ) ee ented and Guaranteed by Pyroil Com- ae oe eclipsing those of pany. W. V. Kidder, President, 633 six months ago! Pyroil Bldg., LaCrosse, Wisc., U.S.A. Tr y aopen, peaa O Mr. W. V. KIDDER, President, | PYROIL COMPANY, : on 633 Pyroil Bidg., LaCrosse, Wise., U. S. A. I'm interested in the money making facts of Pyroil, Show me what others are ome with this amazing lubrication process. Send me a free copy of the beau- tiful hanes Brochure and full facts, wit out obligation. | i aeS k LUBRICATING PROCESS City .. _ a ++ County. as. State...

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top Getting Up Nights? EN past forty should know the real mean- ing of a weakness that attacks millions of men in middle life. Doctors say that night rising in Many cases is a serious symptom—one of Nature's surest warnings of the degenera- tion of a vitally important male gland—the prostate. So little-known is this gland that few men even realize it exists. Yet if unchecked, this diseased gland can actually lead to serious sur- gery. It makes the victim get up, from two to ten times a night. It often causes weakness and pain in back and legs. The victim is frequently “blue’—worried unaccountably—always tired, victimized by headaches, and loss of vitality. Frequently this gland degeneration is the real cause of severe constipation and painful piles. Yet this condition now can be easily com- batted, by an amazing scientific treatment now being used by over a hundred thousand men. W. J. Kirk, President, The Electro Thermal Co., 3862 Morris Ave., Steubenville, Ohio. Without obligation to me, please send my free copy of your book "Why Many Men Are Old at 40,"" and information about your prostate gland treatment. ee ee “ee ee eee ewe wm em eee eee eee eee! City as This treatment is called Thermalaid. Includes no drugs—no medicines, diets, violet rays or massage. Its simple, yet radically different principle has produced amazing results in recent New York hospital tests. Yet it is so simple and easy to use that it may be used right in your own home. It has already helped so many thousands of men, that it is now offered under an amazing agreement. If Thermalaid does not actually make you feel ten years younger in seven days, we agree to refund your money! If you have any of these symptoms, you should investi- gate the Thermalaid treatment at once. Right now we are offering, free, a remarkable book called "Why Many Men Are Old at 40," which explains these symptoms and tells all about this dangerous gland disorder. If your symptoms are not caused by prostate, this book will set your mind at rest; if prostate trouble is the cause, it will show you how you can have the benefits of this scientific gland help at purely nominal cost. Mail the coupon today, and get these vital facts for men past 40, free and without obligation. W. J. Kirk, President, The Electro Thermal Company, 3862 Morris Ave., Steubenville, O. [f yon live West of the Rockies. address The Electro Thermal Co., 500 Wm. Fox Building. Dept. 38-S, Los Angeles, Calif. In Canada, address The Electro Thermal Co., Desk 38-S, 53 Yonge St.. Toronto. Canada.