Modern Mechanix, February 1934

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a 1@S' e Q FEB s Hobb evelt SANI O C ys. WASE La Wee 08 OUR BARE A) $ GZ | een ) efi v &Y @& | : as a |

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Every Needed Fact, Figure, Formula— Every Shortcut and Special Method in the WHOLE FIELD OF MATHEMATICS Now in ONE Handy Volume! For the first time you can have this wealth of practical mathematical information, covering every trade and business, condensed into one handy book for quick reference. This vol- ume puts right at your fingertips instant facts and formulas for making every kind of mathematical calculation. From hundreds of different sources, this priceless information has been gathered together, boiled down into brief, simpl? language, and applied to actual problems. Every man in business, every man in the mechanical trades, every man who ever uses a tool or has to make calculations or esti- mates in office, shop, or home, will find here a treasury of money-making, money-saving ideas. THE HANDBOOK OF APPLIED MATHEMATICS No previous knowledge of mathematics is needed. No study is required. The specific information you want is easy to find, by looking it up in the index. The book takes up every trade and gives you practical methods, easily-worked formulas for solving every problem. Thousands of specific examples show you just how to make your calculations, If your work involves mathematics in any way this complete reference handbook is an indispensable part of your equipment. It is: an amazing time-saver for any one concerned with engineering, architecture, elec- tricity, mechanics, construction, automobiles, machinery, printing, or any other indus- trial work; or with accounting, auditing, manufacturing cost:, taxes, or any other business mathematics. No practical man, no house-owner who makes an occasional repair, no one who has a home work-shop ean afford to be without the valuable information quickly found in this book, Save Time—Be Sure of Your Facts One quick turn to the index in this complete ref- erence volume and you find at once all the facts about your subject—the best methods of doing the work, the easiest formula for making the calcula- tions, completely worked out sample problems that show you just what to do. You avoid the expensive aoe uae pyar the man who u o ae ink what an advantage it is to have all this in- a Of Publication Durable Maroon formation gathered Ge handy book that you ; Offer Fabrikoid Binding can carry in your pocket. Act today and take ad- vantage of your opportunity to examine this book EXAMINE THIS BOOK FREE as soon as it is published, and save 1714% off the SEND NO MONEY—MAIL THIS COUPON Tegular price. The regular price of this book Save will be at least $6.00, proba- bly more. If you reserve your 1 copy now, you may have it for IF 2 (0) only $4.95. Easy payments if on thi: you wish, Speci al Over 800 Pages. 375 Illus- Adwamee trations, 150 Tables. Sa ata EE ee ae ee ee en se Simplified, Dependable Methods by an Expert D. VAN NOSTRAND CO., The author of this book, Mr. Martin E. Jansson, has had the l 250 Fourth Ave., New York $ i widest ng erg oe in eager Bigs Trained as a civil engi- g é x kot Appia neer, he has built tunnels and dams, roads and houses: he J pena feei tage E EE Price. i has had years of experience in railway and industrial construc- l Within 5 days after L recce the book, I can return tion work. He has instructed adult classes at New York it and owe Nothing. If I keep it I will send you $1.25 I University, He gives you the benefit of his wide experience l as first payment and I will pay $2.00 month poe Í in this book, à after for 2 months—* $5.25 in all. (Cash with order | $4.95.) (M.M. 2-34) | See How Thoroughly It Covers The Needs l Norn arti ince iscareass E EEEE E i of YOUR Work Arithmetic — Concrete Machine Shop ] Address .............04- Ka P re ad (including Slide Rule) Brickwork Automotive Shop CE AANE EA E A E E ati Algebra Carpentry and Sheet Metal Work l kan ; Geometry i Building Electricity " RELETENGE. 4.6646. cue ae aes er rigonometry athing and D.C. and A.C.) } Address ....cc0ceceeeees Weights and Measures Plasterink Print Shop ` *if you wish te send cash with Mechanics Painting Business : . | in full, Money refunded if you wish to return the book, g- Excavations and _ Plumbing Mathematics a ee en Foundations o Heating _ Accounting ae y > 3 i oe ` . t ; ` i ` g 4

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Many Make J. E. Smith has direct- ed the Home Study training of more men for Radio than any other man in America. Set Servicing Spare-time set ser- vicing pays many N. R. I. men $5, $10, $15 a week extra. Full-time men make as much as $40, $60, $75 a week. tion a year, Aircraft Radio Radio is making | flying safer. Radio operators employed through Civil Serv- ice Commission earn $1,620 to § $2,800 a year. q If you are dissatisfied with your present job; if you are struggling along in a rut with little or no prospect of anything better than a skinny pay envelope—clip the coupon NOW. Get my big FREE book on the opportunities in Radio. Read how quickly you can learn at home in your spare time to be a Radio Expert—what-good jobs my graduates have been getting—real jobs with real futures. $ Real Opportunities Ahead for Trained Men It’s hard to find a field with more opportunity awaiting the trained man. Why in 1932—the worst year of the depression—the Radio Industry sold $200,000,000 worth of sets and parts! Manu- facturers alone employed nearly 100,000 people! About 300,000 people worked in the industry. In 1932, broadcasting had its most profitable year. It’s a gigantic business, even in the worst business years!) And look what’s ahead! Millions of sets becoming obsolete annually. 17,000,000 sets in operation that need servicing from time to time! Over 600 great broadcasting stations furnishing entertainment and news to 100,000,000 people. Get Into This Field With a Future There’s opportunity for you in Radio, Its future is certain. Television, short wave, police Radio, automo- bile Radio, midget sets, loud speaker systems, aircraft SPECIAL Radio Equipment for Broad Practical Experience Given Without Extra Charge My Course is not all theory. I'll show you how to use my special Radio equipment for conducting experiments and building circuits which illustrate important principles used in such well- known sets as Westinghouse, Gen- eral Electric, Philco, R.C.A., Vic- tor, Majestic and others. You work out with your own hands many of the things you read in cur lesson books, Loud Speaker Apparatus Installation and service work is. another growing, money - making field for trained Radio men. Television The coming field of many great op- portunities is cov- ered by my course. soit Broadcasting Stations Employ man- agers, engineers, operators, and mainte- nance men for jobs paying up to $5,000 [Tl train you at home for many Good Spare Time and Full Time Radio Jobs Radio Factories Employ testers, inspectors, fore- men, engineers, servicemen, for jobs paying up to $7,500 a year. installa- Radio—in every branch, development and improvements are taking place. Here is a real future for thousands and thousands of men who really know Radio. Many Make $5, $10, $15 a week Extra in : Spare Time Almost at Once My book also tells how many of my students made $5, $10, and $15 a week extra servicing sets in spare time, soon after they enrolled. I give you plans-and ideas that have made good spare-time money—$200 to $1,000 a year—for hundreds of fellows. My Course is famous as “the one that pays for itself.” Money Back If Not Satisfied I am so sure that N. R. I. can train you at home satisfactorily that I will agree in writing to refund every penny of your tuition if you are not satisfied with my Lessons and Instruction Service upon comple- tion. You'll get a copy of this Agreement with my book. 64-Page Book of Information Free Get your copy today. It’s free to any ambitious fellow over 15 years old. It tells you about Radio’s spare-time and full-time job ‘opportunities; it tells you all about my Course; what others who have taken it are doing and making. Find out what Radio offers YOU without the slightest obligation. MAIL THE COUPON NOW. J. E. SMITH, President National Radio Institute - Dept.4BH, Washington, D.C. COPY OF MY BOOK J. E. SMITH, Presiden National Radio institute, Dept. 4 hington, D.C. Without obligating me, send free book aboni pars-time and full-time Radio opportunitie: d how tcan train for them at home.: ta nthe job checked: E „Operator. = O Operator of Airway Thank You for Mentioning Modern Mechanix and Inventions for February When Writing to Advertisers 3

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PRICE 15 CENTS (20 CENTS IN CANADA) FEBRUARY ` ARID URIVERIEL as CONT one® SPECIAL FEATURES President Roosevelt’s White House Hobbies - - «= č a «= =| By James Nevin Miller ` Seth Parker’s Sunday Meeting Sails for World Adventure - - - By Alfred Albelli Magic Palace of Radio City - a Gyroscope Monorail Car to Travel 300 Miles an Hour - - f z z South Pole Broadcasting—Admiral Byrd Speaking - - - - - Business Advances With New Inventions Something New Under the Sun in Oddities of Science - - x z By Nic Sprank Stove Top Oven Among New Housekeeping Ideas Heh. ss Cowboy Is Air Speed King- ~- - Ocean Airports to Link Continents By Ben Lincoln “Air Locomotives” Smashed for Safety Expert Tips on Winter Fishing Through the Ice - - . - By Robert Page Lincoln Guns From AIl Nations Stock Movie Arsenals - + - >= - - ogi D > 30 41 42` 46 51 52 56 58 60 67 70 76 AWW — © ald XS \ L A 4 , X d e a a a N Volume XI Number 4 SHORTER FEATURES Problems - - - - - 16 Settle Pierces “Night Beyond “the Earth” - - - - 35 “Tin Plate” Cruiser Loses Skir- mish With Tramp Steamer 40 World’s Greatest Underground Fortifications Guard France 54 Winners of $150 Cigarett Holder Contest - - - 59 Abraham Lincoln’s Old Town ` Rebuilt - - - - - 62 $25 in Prizes for Solving Gear Problem - = = 65 Infantry Carries New Deadly Artillery - - - + - 69 Ships Hauled by Rail Over Canal Lock - - 79 Simple Memory Feat Amazes ` Party Guests - - - - 81 Youth Designs Radio Phone Exchange = & = = 83 Needed Inventions - - - 86 Radio Gets All Waves in One Set, Has Noyel Features - 98 A “Mother-in-Law” Home - 114 With the Collectors - - - 116 BIG HOW-TO-BUILD SHORTS : Fine Fun With Simple Toboggan - 2 2 - 93 Build This Wee Steam Engine 99 Building a Novel Rotor i Iceboat - - - - - 100 Build This Scale Model of the Dirigible U.S.S. Macon - 104 Self-Switching Sidetracks for Electric Trains - os Daylight Developing Tank Made From Varnish Can - 108 Light Plane Ribs in Metal Can Be Built by Any Amateur - 111 Speedy Model Ice Boat Built With Corks, Razor Blades 112 - 106 _ An Eccentric Shop Sander - 113 mpe: (Contents continued on page 6). Gade 5

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TABLE OF CONTENTS Continued From Page 5 NEW MECHANICAL INVENIONS “FOR THE HOME CRAFTSMAN Baby Crib Carried in Auto - - 34 Burglar Alarm for Country Stores Rings Automatic Camera Snaps Raiding Bandits - 38 Bell in Home - - - = 94 Laundry Can’t Be Lost in New Case - - - 38 | Moulding Makes Darkroom Shelf - + = 94 “Normandie” Has Largest Motors - 39 | Spiral Wire Keeps Chimney Clean - - - 94 Tanks, Guns Used in “Battle” Game - 44 | Handy Reel for Electric Cord - - 97 New Guard Keeps Rats Off Ships - 44 | Lathe on Folding Table Top Is Big Help to “Wingless?” Autogyro Is Successful - - 45 Home Electrician, Radio Man - + +: 97 German Rises Six Miles in Rocket - - - 54 | Rubber Pad Keeps Pans From Wall - - - 107 Moisture Fan Bests Tropic Heat - + - 54 | Street Lamps Make Flower Pots - - - -110 Efficient Antenna for ‘Auto Radio - - + 55 | Small Power Saw Useful Tool - - - -110 New Craft Makes Veneer Effects 55 | Chips from the Editor’s Workbench will be found Items of Interest to the Housewife this month on page 12 Rotary Ice Chopper Shaves Up Ice Cubes - 56 Waffled Steaks are Juicy and Genes - - 56 FOR RADIO FANS Midget Humidifier - - - 57 Oxygen Bubble Bath for Beauty - - + 57 | Sparks From the Radio Editor - - 95 Flashlight for Difficult Reading - - - - 63 | How to Hook Additional Speakers to Sahe New Rifle Shoots Beam of Light - - - 63 New Radios - - - - 95 Russia’s Giant Snake Train Rolls Speedily Ford Magneto Terminals Make “Good 7 on Steel Balls - - - 64 Insulators - - 95 Pontoons Hold Roof of Gas Tank - - + 66 | Hard Rubber Toothpaste Caps Make Impro- Iron Horse Turns im 15-ft. Circle = - 66 vised Radio Set Dials - - 95 Fire-Proof Plane Design Successful - - _- 68 | Storage Battery Makes Transmitting Wood Grain Transfer Paper - - 68 Condenser - - - 95 Pocketbook Firecracker Alarm Catches Wife - 73 | Shielded Antenna Lead: In Helps Reduce Steel Booth Fraps Bank Bandit, Sends Out Electrical Noises - - 96 Police Alarm - = - - + 75 | Handy Wire Stripper Made From Clock New Cars Have Engines at Rear - = + 78 Spring - - - 96 Motor Uses Half Teaspoonful Oil - - - 80 | Ford Magneto Ribbon Makes Efficient Wheel Runs Automatic Tire Pump - - - 80 Antenna. - - - 96 Rubber-Tired Train Makes 75 m.p.h. - ~ 82 | Amplifier Increases Volume of Phono: Radio Changes Programs Itself - + 85 graph Pick-Up - - = 96 Plane Forced Down; Pilot Scoots Away on Easily Made Jig for Winding Radio Coils Tiny Motorcycle - - Š o d a7 on Tube Bases - - 97 Air Mattress Is Floating Bed - - + + 88 | Burning Insulation Eroin Wire - + = - 97 Increase Magnetic Speaker Volume - - - 97 INTERESTING SCIENTIFIC ITEMS HANDIKINKS FOR EVERYBODY Glass Jar Caps Defy Housewives - = + 38 Banner Crop of Cactus Fruit Made Into Screw Eyes Keep Boat Oars in Position - 89 Candy and Jelly - -= - - 39 | Sheet Cellophane Between Screens Makes Mounted Animals Mimic Humans - - 64 Window - -= - - - 89 Rum Ship Disguised as “Texas Ranger” Wood Knob Increases Leverage əf Hammer - 89 Fools Coast Guard - - - 66 | Catch Holds Garage Doors Open - - - 89 Cobbling Bill Paid in Gold Dust - - + 73 | Bench Vise Makes Efficient Punch Press - - 90 Perfect Bed: Built of Tin Cans - - 73 | Large Potato Will Serve as a Gas “Treasure Map” Discovered in Old Watch - 74 Tank Cover - - - - = 90 Patient’s Heart Stops Four Minutes - - - 75 | Cutting Car Gaskets With Hammer - - 90 Miniature Racing Cars Are Latest Fad in Compressed Air Cleans Clogged Radiator - 90 Hollywood - - - + + + 78 | Handy Lifting Rings for Automobile Dog Rolls Tires for Sport - + = = = 78 Engines - - - - 90 German Ship Gets Face Lifted - ` =- 82 | Electric Bulb Dries Wet Hat “Quickly - - 9l Englishman Swallows Nose to Pull World’s Sugar Bin Screen Pulverizes Lumps - - - 91 Ugliest Face - - - - - 84 | Punch Two Holes at Once in Condensed Dog Is Mother to Baby Rabbits - = = = 84 Milk Can - - 91 Coffee Pot on Truck Sings, Speaks - - - 85 | Ammonia Gun Easily Fasténed to Flashlight - 92 28 of Tiniest Books Fill Thimble - - - 87 |! Pasteboard Cartons Make Fine Tent Floor - 92 William J. Kostka , L. B. Robbins Editor Published monthly by Modern Mechanix Publishing Co., Nationally Known Radio 529 So: St., Minneapolis, Minn., use Bure Expert Ww F. as Secon: ass matter Sept. 20th, 1928, at Minneapolis, Nou a Minn. Copyright 1934. dvertising offices Chicago, 919 S. S. Rabl Technical Editor N. Michigan Ave.; New York, a2 Vanderbilt Ave. 15 Seaplane Designer and Naval Architect : cents a copy; $1.50 a year in ÙU. S. and Possessions. In Robert Page Lincoln Canada, 20c a copy; $2.25 a year. Other Postal Unions, Ray F. Kuns Hunting and Fishing $2.00 a year. Printed in U.S.A. Principal, Cincinnati Auto- Editor bi motive Trade School

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L. L, Cooke, Founder, and F. L. Howard, Chief Engineer, L. L, Cooke School of Electricity. \ mk ELE CT CIT Yy today’s great GET \ Opportunity for you and every other man who is sick and tired of struggling along on small pay. Hundreds of “Cooke” trained men, who knew nothing about Electricity when they started my Training, are now,—even in these days,— making $40 to $75 a week;—and some are making a great deal more. LEARN AT HOME IN SPARE TIME Learn with the famous L. L. Cooke “Work Sheet” and “Job- Ticket” method. ‘It’s simple—it’s practical—it’s easy. It’s just like Shop Training,—only it’s all done right in your own home, P DOUBLED with the 5 Big Working Outfits given to you without extra “B . REO FRomotED TO E . : i 3 ; itti r inene Lever niece. B BETTER JoB B Charge. And it’s done in your spare-time, without quitting your Getting double J Xour training H present job, or losing a single hour’s pay. got me promotion § ba and bigger pay, I’m working former pay and rm now Head Electrician.” P. A. Burnham, Ciitchton, Ala. PREVIOUS EXPERIENCE NOT NEEDED You don’t need previous experience—you don’t need higher education, —to learn Purnell, 65 N. @ Electricity the L. L. COOKE way. A common grade schooling is enough. J Santa Anita Av., This great Course of home-training is amazingly simple and clear. There's g Pasadena, Calif. nothing like it anywhere, It’s the Training with hundreds of successful grad- a = uates, —men on Easy Street, today. It’s the Training for YOU. CHIEF IF YOU ARE MAKING A CENT LESS THAN Cc ELECTRICIAN anette $50 a Week — I tigate! Chief Electrician a ee nves iga C: of big woolen Bi with old- timers but I keep up with them.” Ray GETS $50 _ RAISE “Your training is sure good. Boss got stuck ona job —l_ straightened him out. Result —a $50 raise. Chas, L. Butts, Coxwell St., Afton, N. Y. “Cooké Trained Men” are the “Big Pay Men”, everywhere. $40 to $160 a mill. Thanks to you,” Henry De- week is what hundreds of them are making, today. That’s the kind of a job wurt, 587 Hughes for you. Get started under the famous L. L. Cooke Money-Back Agreement. St., Woonsocket, P Rhode Island. Act today—to increase your pay. Send coupon for Big FREE Book, and full particulars, now. No obligation on your part. COOKE Training Is L. L. COOKE SCHOOL OF ELECTRICITY = a Dept. 32, 2150 Lawrence Ave., Chicago Shop Training for the Home Send me your FREE BOOK in Electricity and all details of your home trainlng course and your MONEY BACK agreement.

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fF Try Some of These Remarkable Seed Novelties E The Wonder of the World || Japanese Rose Bushes bleom all the year round. Just think of it. Six weeks after planting the seed, the plants will be in full bloom. It may not seem possible, but we posi- tively guarantee it to be so. They will bloom every ten p Summer or Winter, and when three years old the bush will - be a mass of roses, bearing from five hundred to a thousand roses on each bush. `The flowers are in three shades —white, pink, and crimson. The plants will do well both in and outdoors, We guarantee at least three bushes to grow from each packet of seed. Price, 10c packet, 3 pkts. for 28c postpaid. Chinese Fragrant Tree Fern) Weather Plant Juat Introduced; noted for NATURE'S WEATHER PROPHEP ` its rapid growth. An ex- By mysterious chen, en that take ec Gonally ps retty orna- mar) j- mentalplant Foliage larch i; piae, iy forecast ta Sere weather o, mane ore in a Byalast paahon about grow qanyghere ‘sil tho iat dealreble ford secoranve Plant, i ieeresting house ete. ” Dink, butterfly ahape lowers. Beads 156 pit, 3 for 40e. Seeds, 150 packet, 3 for 400, pestoald ‘GROUND ALMONDS ( ' Amazingly Prolifio—Easily Grown From Seed The Grown Almond has a flavor that ie MOST EXCELLENT, resembling the cocoanut, The meat is mow ghita, covered oo achell orgkin of brown color, t grows close to the eurfece and snything Fork 200 to 300 Almonds may be expected froma plagio n nut. There le no trouble whatever th growing any w! any kind of soi). May b bo lanted anting Son will kore lma EN ae Mi SUS CROP oF the ti test Geeds 150 Pkt. SENSITIVE PLANT US ALMONDS YOU EVER TASTED. |Seeds Perfume Plant Marvel of the Philip- pines. Leaves curl, fronds droop when x Blooms only, touched, Apparently - vesents interference, A handsome shrub for house or garden; ery curious and interest. ing. » 13c pkt., 3 for 40c. veer Nest Egg Gourd | moat de ger bcented 5: grance for quite a distance, uses much comment.” For Bansa or: garden. Abo valuable because of rare perfume nade from It. GEEDS, 100 pkt., 3 for 25c; Calahash or Pipe Gourds A luxuriant and rapid growing climbe: ful are made. prow | thia in- meand make yot OWN), send makoveur own Sesde | weeds 150 pkt, 3 phts, foc 40e... Mammoth Peanuts Pesnuts can be easily cultivated. Their culture is vory simple and exceedingly interesting. Mammoth Poannte grow to an astonishing size. Itis a good pro- ducer, yery prs rolifio, and the giant nuts haye a thick, heavily rib protecting shell, The plant is very attractive, the leaves being of odd shape and a handsome m shade, tinted through the center with white. Xon will derive much pigasure cultivating thie Interesting Geeds 150 pkt, 3 pkis. for 400. Musk Plant Japanese Ciimhing Cucumber mired faverita neeead az mire favorite for house, flower vine sree calabash pi tereating’r garden or or greene twice the size very of ordi va- fine bouse Mr. tieties, Grows Lives for years. Ü readily on Jo of the sweet fences, ‘poles, scented variety, trellises, etc. giving forth: much fragrance. Also Saluablo on ao tire eount of the perfume that can be mada Feet ly supplied from it. Seeds We pkt, 3 for 40c. all summer. Seeds ao © ach 3 tor 40c, postpaid, a GIGANTIC amea BUTTER BEANS THE NEW EDIBLE VEGETABLE WONDER Towa to an astonishing size, the Beans meas' from rom B to & feet long, and wei hing anything. from 10 to 16 lbs. and even more. One joan Ja lapu keent for a family for several meals. vey, Role rich fo nutritious materiale, The to Battery Flavor ls mach appreciated. The yes are et grown, very roll o, and a most welcome and val- ble adjunct to your garden, Try them: you will them the most dalicious vegeta u have ever tasted. Imported direct ea le elge- where. Sample package of Seeds with full direc- = tions for cultiva: and coo 23¢, postpaid, Kudzu Vine Yard Long Bean yg Most rapid growing oP al ate, aen 20 feet In one week. excellent quality for enap Ba ode grow from 2 EA 5 feet in length, Very tander and fine flavor. Tho vines are rampant Luxuriant follage, lovely purple flowers, very fre- grant. Nothing equal it for shade purposesand ene buriosity. quick growth. Seeds 1 . Seeds 15c packet, 3 for 40c. Storace JAPANESE ROSE BUS HES | remarkasce Fr | eating faw, cooked, THE FIREFLY Me the Atmosphere with PLANT cfccmescnigne Fragrant Aroma ae of the most rapid growing vines ynom: Under favore OVER 25 able conditions this vine has FEET IN A SINGLE Indeed the Vine has climbed we @ great with IMMENSE FLOWERS, It is, indeed flowers Q. main open all day. a ENN THE pozele fers about ees he following day. In dull weather they wil lt is a most INTERESTING own to grow . ln avery short space of time eight, and Is covered from 5 to 7 inches In dlamete tollke other plants, the and remain open until Nl re- SHT to to watch the cpening: and closing, of the flowers as the clouda ETRO. Er eart DE ELI AST ica de TheGreatWonderberry B Boll or climate inSmonths. gurp: canned or preserved in any form, The fruit is bine-black In color, and tastes like a luscious, ric! blueberry. One bush will produce an enormous amount of fruit, ylelding great masses of rich fralt all Summer and Fall, Packet, 10c, 3 okta. for 25c, postpaid, wet Umbrella Palm £ Japanese p Boil. @ bowl or jardinlere Inches of gi gA retty palm-like appearance, as shown ki Rie tops of the stems are surmounted by brella-shaped leaves. of aw @end a pac! culture, for only 150 or three Butterfly’s Own Bush lant fs a The le refuge or haven for but- EGR Sih ine most beautiful Ses to tho neish- bor hood. Beets R re TI fora of it. i is a B.pretty Nant i bearing perfectly double flowera, ranging from white to rich crimson, deep r: ed and pink, lilaa and other Folica Packet 10 cents, 3 for 25 cente postpaid. CACTUS FROM SEED me be shades. f praat ara aaee fully fragrani the bp antibes Laa just en ppronting. iO s Fag achot, 10 Motena, FERN SEED Ferns can be grown from seed. Try your luck growing these beau- tiful plants for indoors or outdoors. Choicest mired varieties. Packet “Chinese Cabbage TREE OF Novelty from China and should be grown in every gorden, Seems to e a cross between Celery and Oos Let- y tuce. lavor ia more mild than eny other cabbage, Can be served on the table and eaten raw or HTFUL AROMA around la full of eniad fragrance. of favorablo comment, and mach eus ple praning at night tine as to the leavor to satisfy their, 35 CENTS, POSTPAID. Conservalory Piani Easily Grown From Seod Winter or Summer The Japanese Umbrella Palm fs a seml- r is easily grown from s mand sither In a bow! ol water or D very most usual the moet interesting. Freche, iste cultivate the plant in filled with water, with rden soll at the bottom. Boon commenca to germinate, and the plani stems two to three feet high and rapidly assumes a moat pearance, kage of this seed, with fei instructione for Packets for 40c As the flowers open they give forth and the whole atmosphera It is ings the pobeci E an hired hoo Fly Pla A Sho Temarkabla m. anical guricalty youshould h ‘Though quite odore maid dite wil not ina roomwhore itis own. Beara very pretty a Cie aay Bummer d winter, Grows rapidly from SEEDS 15c pht-t 3 for 400, postpaid, ana Musk Melon Quite a cutioeity. Looks and smells! dita delfctow aver i akel me ta ue fiavor make amh your while cultivating. Flesh is deep and of exquisite fiayor.- " very high prices ate obtained in choice oity marketa; jolla pomem, being as high as a de one Seeds manded for ona Cie ore cia. far 25s Graceful House or uatie plant. of water or two or three ie seeda t _shoota up the engraying. a whorl of um- We will postpaid, FAMOUS. MEXICAN FIREFLY PLANT Reautifal hedge plant, grows 2 to 4 iqeebishpnd resem- ling a closely clip= bed ornamental ev- ergreen. The globe- Bhaped or pyramidal 4 bushes are close and compact, and of @ pleasing light green color. Moy be grown eli y of ba the form of a bed: ge In early jpe ar Plgod or background. Whole bush becomes carmine or b Fueetaresahenie Stet a fot ja ul ueh,” a9 irda Gometimes called. Salacted Seade. Asparagus Sprengeri The bestplant for hangin ng bankete. 4 ses of rio h, j gleaming foli- age drooping very graceful manner. The fo- “ie liage when cut for decorative purposes will lest for weeks In water, Thea pods are very pretty redbe eters tidding to ita Bendts Packet, 2 3pkts. for 650 postpaid HEAVEN This splendid om orisa menta! a native of Ohna and is aalled tha ‘Tree of Heaven, on account of its ery bardy, t tives in any šil, no matter how poor, and grows from 6to 10 fect ene from Y cooked like cabbage, spinach or are f 6 Bee vag lettuce or made into soled. Tea gran {20 fest ia 55 deneih airing Grows very rapidly, easy to cultivate, You can create quite 8 sen- sation by cultivating this remarkable novelty. Seeds,15c packel, 3 phts. for 40c. SURPRISE FLOWER GARDE MANY RARE AND CURIOUS NOVELTIES An Abundance of ‘Flowers Assured Throughout the Season ve the constan continual and pods, m. thing of beauty. for finely arranged Gellehted with the Sarsrise Wid Hower Gaiden. the old throughout dred varieties of seeda. 2 Re taken inside as house, plants and Wit bloom uring the winter. ers for school gardena. Packet, 15 cents, three e” packets for the tropics can rival it for lawn decora~ of bloom, followed reat clusters of coloted the tree a continual “Packet, ‘16c; 3 packets 40c Over Hundred Varieties of Mixed Flower Seeds go panicles season by A mixture of easily grown annuals thet bk very soon after sowing the seed; others vary in thelr time of bloom): oming ose who cannot flower beda will Will proves surprise and pleasure, as new varieties en favorites. flower successively eve re hun- Many y of the p looming. fanta may Fine for children, also teach- cents, Posi ipalit. J. 8. & CO. Address all orders to JOHNSON SMITH & CO., Dept 717, RACINE, WIS. Send 10c for big 710 page novelty catalog

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Give me your measure and Pil PROVE You Can Have a Body like Mine! NOTE: No other Physical Instructor in the World has ever DARED make such an offer! Ceestes litter The 97-1b, weakling who became twice holder of the title: “The World’s Most Perfectly Developed Man”—won in open-competition in the only national and interna- tional contests held during the past 15 years. turn you, too, into a man of might and muscle, Let me prove that I can put layers of smooth, supple, powerful muscles all over your body. If you are underweight Pli add the pounds where they are needed and, if you are fat in any spots, I’ll show you how to pare down to fighting trim. And withthe big muscles and powerful, evenly-developed body that my method so quickly gives you, I'll also give you through-and-through health—health that digs down into your system and banishes such things as constipation, pimples, skin. blotches and the hundred-and-one other ailments that rob you of the good times and the good things of life. Here’s All You Do! Just jot down your name and address on the coupon below, mail it to me—and I’ll send you, absolutely free, a copy of my new book, “Everlasting Health and Strength.” It reveals the secrets that changed me from a 97-pound, flat-chested weakling into a husky fellow who won the title of The World’s Most Perfectly Developed Man” against all com- ers! And it shows how I can build you into an "Atlas Champion” the same easy way. T haven’t any use for weights or pulleys that may strain your heart and other vital organs. I don’t dose you or doctor you. Dynamic-Tension is all I need. It’s the natural, tested method for developing real men inside and out. It distributes added pounds of powerful muscles over your body, gets rid of surplus fat, and gives you the vitality, strength and pep that win you the admiration of every woman and the respect of any man. | / Te give you PROOF in 7 days that I can Gamble a Stamp—To Prove I Can Make YOU a New Man! Gamble a stamp today by maillng the coupon for a free copy of my book, ‘‘Everlasting Health and Strength.” It tells you all about my special Dynamie-Tension method, and what it has done to make big-muscled men out of run-down speci- mens, It shows you, from actual photos, how I have developed my pupils io the same perfectly balanced proportions of my own physique, by my own secret methods. What my system did for me, and these hundreds of others, lt can do for you too. Den’t keep on being only 25 or 50 per cent of the man you can be! Find out what I can do for you. Where shall I send your copy of ‘‘Everlasting Health and Strength”? Write your name and address plainly on the coupon, and matl it today. CHARLES ATLAS, Dept. 6-B, 133 East 23rd Street, New York Clty. -cii CHARLES ATLAS, Dept. 6-B, i 133 East 23rd Street, New York City. I want the proof that your system of Dy- namlc-Tension will make a New Man of me— give me a healthy, husky body and big muscle development. Send me your free book, ‘‘Ever- lasting Health and Strength.” NQMC... 0c e cere eee ee eenes eaten eee enenes (Please print or write plainly) AGAreSS. 0.0... cece e rere eee A waits ie She Cer epee in oe Stale. ..spenees Thank You for Mentioning Modern Mechanix and Inventions for February When Writing to Advertisers : ; © 1933 C.A.Ltd. | un a u T a a å å ee ee ee eee ee ae. 9

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SO YOU’RE GOING BACK TO WORK @ Tuat’s FINE! And more good news is that improved condi- tions are sending many other men back to work. But don’t let your enthusiasm dim the facts. Business to- day, and from now on, has a new standard of service, It isa standard of efficiency — of training — and to ignore it is invit- ing another long stretch of unemployment, j It’s ‘foolish when you can acquire so easily the training you must have... when you can make yourself more valuable on your job by devoting a small portion of your spare time to study, In years past millions of men have come to International Correspondence Schools for this training. Today, with its un- usual’ conditions, is bringing many of these men back for additional training, to meet and solve the problems of a new day — and many thousands who have decided to face the facts and assure their own futures. This coupon is a challenge to you! Why not mark and mail it—right now? Ff- desired, you can arrange to complete the course of your choice through easy monthly payments. INTERNATIONAL CORRESPONDENCE SCHOOLS “The Universal University” Box 2325-U, Scranton, Penna, Without-cost or ‘obligation, please send me a copy of your booklet, “Who Wins and Why,” and full particulars about the subject before which I have marked X; TECHNICAL AND INDUSTRIAL COURSES O Architect D Automobile Mechanic O Architectural Draftsman D Plumbing O Heating D Building Estimating O Air Conditioning O Wood Millworking D Sheet Metal Worker D Contractor and Builder D Steam Engineer OG Structural Drafteman O Structural Engineer D Bléctrical Hngineer O Blectrio Lighting O Welding, Electric and Gas O Reading Shop Blueprints D Telegraph Engineer O Telephone Work D Mechanical Engineer D Mechanical Drafteman O Machinist O Toolmaker O Inventing and Patenting D Patternmaker D Heat Treatment of Metals D Bridge Engineer D Bridge and Building Foreman D Steam Electric Engineer D Civil Engineer D Surveying and Mapping D Refrigeration R. R. Locomotives O Air Brakes R. R. Section Foreman R. R. 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Coaching DO Reilway Mail Clerk D Bookkeeping D Grade School Subjects Secretarial Work O High School Subjects ‘Coat Atvcountant O College Preparatory ‘Saleemanshiip D Advertising [First Year College Service Station Saleamanship [O Illustrating DO Spanish O Wallpaper Decorating O Cartooning D Freneh Salesmanship O Lumber Dealer i NAME coc ra sirrin r ANNENS KANRAN EREE EEE r-t PEPEE MAUVO sienio kerar EEEIEI ERENER SATO eae nara Sew ee CMY NETE E TELELE E TEETE State. esseere OCcupAtlon: 6..ccuaddwadiad sedudeseweserawsdetsadawned iehi ER If you reside in Canada, send this coupon to the International orrespondence Schools Canadian, Limited, Montreal, Canada ve light, compact, beautifully enam- eled case from your vest pocket. You press a magic button! A miracle happens! Automatically there is a spark... a flame. ; Your favorite brand of cigarette is delivered ... LIGHTED ... right to your lips. You PUFF and SMOKE. A new, revolutionary, dy- namic invention ... perfected . . . guaranteed . amazingly low: priced. Just what every man has been waiting for. 15 DAY TRIAL OFFER Say the word and we'll wrap up a Magic Case and send it to you for 15 days’ trial at our risk. Write for details of this liberal offer. MAGIC CASE MFRS. 4234 Cozens Ave. Dept. B-3548 St. Louis, Mo. AGENTS Millions in -the Magic Case for salesmen. Send’ for facts that fairly scream Big Profits. Get trial‘ offer. WANTED AA ACTU] ER! MANUFACTURERS On small or large scale for our NEW LINE of Cast Metal 5 and 10e Novelties, Ashtrays, Radlo Ornaments and other all year sellers. No special place orexperience necessary as we furnish full instructions with’ moulds and cooperate in selling, also buy. finished goods. Chance of a life-time for man with-small capital to get into this new and profitable industry. If you. mean strictly business and are over 21 write AT ONCE for details as wholesale season is now starting. METAL CAST PRODUCTS Co. {696 Boston Road Dept. 2 New York, N. Y. BU | ED [T~ RSELF -PLANS The JIM DANDY CABIN TRAILER A classy looking coach any home craftsman can easi- ly build for Httle money. Nothing complicated. Ac- commodates 2.to 4 people comfortably. Unique ar- rangement makes roomy interior. Plans and in- ALL PLANS AND INSTRUCTIONS FOR $1.00 Big Value! 50 diagrams, sketches, photos, etc, Detailed instructions and many valuable ideas and suggestions for trailer builders. structions are complete Material list tells where to get needed parts. and easy to follow. Send for your copy today—NOW! MAIL DOLLAR BILL to JIM DANDY, Box 125-C, WAUSAU, WIS. MENDS WITHOUT, SEW-NO-MORE is the amazing product that mends rips, tears, holes in any cotton, wool or silk fabric — instantly — neatly —INVISIBLY without needle or thread. Better than- darning or sewing. jottems matched per- WASHING: fectly. Stands washing, boiling, irening. STANDS Anyone can-use it. Takes only-a minute. Saves eyes, clothes, time, money. Popu- lar priced, Pays 217% GUARANTEED rofits. ‘‘Made $132.00 in 3 weeks,” writes arper of Pa, FREE SAMPLE Sesak dene with SEW -NO MORE. FREE Outht and territory offer. SEW-NO-MORE Madi: BOILING IRONING Dept. R-970 0. n Road, Cincinnati, Ohlo 10 Thank You for Mentioning Modern Mechanix and Inventions for February When Writing to Advertisers

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apart sacs eon sacs tu bet re al money you can learn to play _ this easy fascinating way YES: I mean actually play real music—classical: numbers or jazz—so that you'll be able to en- tertain your friends—to be popu- lar everywhere. And whats more, you won't need a private teacher, You'll Jearn all by yourself—right in your own home. And best of all the cost is only a small fraction of what it used to cost by old fashioned methods. Why am I so sure? Simply because more than 600,000 other men and women, boys and girls—no more clever —no more gifted than you — have learned to play by this modern sys- tem. Piano Organ Ukulele Cornet Trombone Piecato Guitar No Special Talent Required Learning to play this U. S. School of Music way is easy as A-B-C. No special talent is re- quired—no previous musical training. If you can whistle a tune you can léarn to play by this simple method—quicker than you ever dreamed possible. There’s noth- ing tricky about it—no complicated theories— soci PICK YOUR INSTRUMENT nothing to memorize. You learn to play from real notes—the same as those used by accomplished musicians. And with this shortcut system you don’t have to spend hours practicing tedious scales or monotonous finger ex- ercises. Instead you have the fun of playing real tunes—right from the very beginning. And almost before you rea- lize it you are able to pick up any piece of music and play it. Clear as Crystal The, best part of it all is that it is so simple—so crystal clear—so easy to understand. It’s all right before you in print and pictures. First you are told how to do a thing. Then a picture shows you how to do it. Then you actually do it yourself and hear it. It's fasci- nating fun, too—practic- ing becomes a real inter- esting pastime instead of a wearisome task. Violin Clarinet Flute: Saxophone arp Mandolin Cello Hawallian Stee Gultar Sight Singing Piano Accordion Italian and German Accordion Voice and Speech Culture Harmony and Composition Drums and Traps Automatic Finger Control Banjo (Plectrum, 5- String or Tenor) U. S. Junlors’ Plano Course Free Demonstration Lesson So that you may see for yourself how easy, how pleasant it is to learn by this modern, simplified method, the School of Music has prepared an Illus- trated Booklet and typical Demonstration Lesson which are yours for the asking. They explain fully the principles of this remarkable method and how it enables you to become a popular musician in a surprisingly short time, at a cost of only a few cents a day. If you are really serious about want- ing to learn music—if you honestly want to become popular—to have the pleasure of entertaining your friends— take this first step today—send for this Free Booklet and Free Demonstration Lesson. Don't put it off. Mail the cou- pon below and they will be sent to you promptly. No obligation. U. S. School of Music, 2622 Brunswick Building, New York City. oo U. S. SCHOOL OF MUSIC 2622 Brunswick Bldg, New York City Please send me your free book, “How You Can Master Music in Your Own Home,” with inspiring message by Dr. Frank Crane, Free Demonstration Les- son and particulars of your easy pay- ment plan, am interested in the following course: Have You Wena’ eresas eooo e Instrument?........ NAME resad Egera ts ANENE ER i Address sses ana umama wap tuarndee EEA Clty sas aarenue.® aandae State........ Thank You for Mentioning Modern Mechanix and Inventions for February When Writing to Advertisers 11

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7 saminaren aa eet a gas | Here are the latest additions to the membership of the M-M “All Sorts’. Club. Left above, two boats built by boys at Camp Shawnee, Twin Lakes, Pike County, Pa. Center is the All Sorts built by W. R. Bell, of Milwaukee. At the right is shown the lovely All Sorts built by Henry S. Beveridge of Portland, Maine. This All Sorts design was justly popular and as we receive more snapshots from All Sorts builders we will add them to the album, lads! Chips from the EDITOR’S WORKBENCH Andy presents a galaxy of unusual letters from fans who have had a good season with the building of cars, planes and boats. E HEAD the column off this month without much ado because we have a nice run of seasonable letters—all about ice sleds up north, and all about sailin’ boats in sunnier climes. Some fellow is coming along with a really practical snow scooter, or snow sled, or snow hog—call it what you will—and for the bleak months of the year his stuff will be king of the pile. So far we have seen but one snow sled idea that looked right. That was the one built by that chap in Michigan. Remember?—A to- boggan with twin wheels and a Henderson four to drive the thing. We are in hopes plans for such a sled will show up. A practical vehicle for navigating difficult or drifted roads or cross country reaches would be eminently serviceable. Ice sleds are a different breed. They are the humming birds of the species. They toil not, they do nothing but spin. The big idea is to go places quickly. Here’s a letter: Wm. Lusk, 2614 Clifton Park Avenue So., Chicago, Ill., has cooked up a safety lever for shotguns which helps sighting, insures proper stance and prevents gun being fired unless actually held to the shoulder and aimed. 12 6 Spring St., Webster, Mass. Dear Andy: I have enclosed a snap of my iceboat. Whether it is good enough to print in your column of fan mail is up to you to decide. I designed and built the boat. Wood was used for the complete fuselage. I used tubing for my motor stand. The boat is eleven and one-half feet long and six feet wide on the rear runners. : I have used a souped up Harley 74 with my own propeller for a power plant. The boat with two passengers and myself did do 75 miles per hour without tail wind help. I have tried tractor type boats and the rea- son for building a pusher type, I found them more practical and it has a bigger factor of safety over the tractor type. Yours very truly, Henry J. Kokernak. Sorry that H. Js photo wasn’t clear enough to run. i e E . And as Mr. Kokernak yearns for a tractor type, in comes a letter from Frank Francione, of Tren- ton, N. J. Frank is an old friend of mine, and we've written before. While you cannot discern from the relative comments concerning the advan- tages of tractor or pusher prop for ice sled work, Tm inclined to favor the pusher, myself. This is from a purely reasoned standpoint, and I may be all wrong, I know that aerodynamically a Modern Mechanix and

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prop is more efficient up front, but I feel that it’s better to have the weight concentrated aft, and steer with a light.runner up front. But see what Frank has to say about his sled. Ed + * 53 Chase St., Trenton, N. J. Dear Andy: I have been receiving and reading the M. M. for the last two years, and ‘also have the Flying and Glider Manual and the 733 manual. I would like to get the 1931 manual, if you have it would you please send it. I am also sending you a few pictures of the ice sled I have built of my own design. I built her last faH. I gave her a try-out on the ice and it certainly was worth my effort. It is 12 feet long, 20 inches wide, 22 inches deep. It will:do about 30-35 on ice with a 6 H. P. engine. I have made a pair of floats for it but the result was not so good. It went very slow. She would head in the wind and stay there. So I will be leaving you as one of your ` readers of M. M. Please do not forget to send the 1931 manual. Thank you, Frank Francione. * * * Frank’s letter bears me out in my. contention that whatever. the merits of tractor vs. pusher may be, the straddle bug idea for. water is all wet in more ways than one. And it gives your Uncle Andy a chance to say I tolja’so once more. + * * Though I haven’t room for the letters of these good chaps, I want to doff my topper. to Messrs. Beveridge, Brown, Bell and Cullin, who sent in shots of the All Sorts I asked for in a recent column. And-off to the top of the page we have the pictures of the boats built from Farmer's design of All Sorts by Camp Shawnee boys, by W. R. Bell, and by Henry Beveridge. Thanks again to these men for responding to the call for shots for an “All Sorts Album.” Last month we ran a picture of Mr. Cutler’s boat. Any more of these photos on the way? Hurry up! I know over a hundred plans were sold. I'd like to initiate a few more members. Let’s give out numbers! Here y’are boys: Andy hereby officially gives you an “All Sorts: One Design” club number which you can carve on the thwart of your boat. In order of appearance at my spindle: No. 1—Henry S. Beveridge, Portland, Maine. No. 2—W. R. Bell, Milwaukee, Wis. No. 3—Cutler H. Brown, 729 So. St. Andrews Pl., Los Angeles, Calif. No. 4 and No. 5—Built by Camp Shawnee, 541 Pelham Rd., Mt. Airy, Philadelphia, Pa., under direction of B. H, Cullin. There y’are, me hearties, and Mr. Cullin, you’ve got the task of assigning the proper number to the proper boat, since your camp built two of them. Š Smart idea, that. Letting the lads of a good and well organized camp. build a project like this from the pages of M-M. Most cases the boys already know the thing to be built by beart, having seen it in these pages. They read M-M, too. ‘ Inventions for February A Super-pursuit Ice Wagon Mr. Frank Francione, of Trenton, N. J., believes in instru- ments. This should delight the heart of every. kiwi who is instrument conscious, eh, what? These shots are of the good little ice sled built to test out a,2 cyl. motor he made. Why’n chu men get together and let me hear when you get the numbers on? I'm turning to the Sunray club next. ” + * Since spouting a bit about light cars last month, I have a most interesting letter about what -one ardent M-M reader did with his pet building project. Sh! It’s an Austin! Garnerville, N. Y. Dear Andy: Enclosed find a couple snaps of my con- verted Austin. Converted I say, but only in body and springs or frame. Everything is stock except the special arm on the steering gear and a 12 inch extension on the front of (Continued on page 14) 13

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Home-made Scuttle Bugs (Continued from page 13) McKinley D. Allison, of Garnerville, N. Y., built this snappy: speedster from one of the little Austin chasses. the frame. I also flattened the rear springs out. The body is 18 inches wide-at the dash so there is just enough room for two persons. The back part is made of aluminum ham- mered to fit and the hood and cowl is of 28 gauge galvanized iron. The radiator shell is made from the two back corners of the body riveted together in the center. The motor is just as.it came from the factory and though I don’t know the R.P.M. the car does 65 M. P. H. by a good speedometer, 75 by its own. ‘Not bad for a crack-up job. Cost me $8.00 to build the body and the other little parts. Run the picture if you want and any infor- mation about the car will be gladly given if a stamp is included. Have read your magazine since it was born. Sincerely yours, McKinley D. Allison. kd * lod —the pic of Allison’s car appears above. Cute little buggy, isnt it? Sign-off news: Ritchie Thornbury, reader since the days of the Alco sportplane plans (remem- ber?) returned to Ireland from this side, there building the Alco with a Gnome rotary. and Heath Floats. I got a big bang from his letter, too long to publish here. The ship was wrecked before flight while taxiing. ; Here’s his letter in part, the rest being too long to run: Frank Howard, Jr., of East Palestine, Ohio, built this wind wagon on a Model T chassis with Ford Model A power. 14 .. . I am enclosing a few shots of the little plane I built. You will hardly remember, Andy, but I wrote to you once about what you thought of a Gnome 50 h.p. motor and you said you thought they were angel makers. You were right. The plane was the Alco Sport pub- . lished in M-M, the floats were the Heath, out of M-M. I had quite a job to balance her in. the water but when I got the rigging right she’ went nice. . . . The water cut the edge of the prop to pieces. I never had any lessons and thought I could take it up myself. Had a few spills, and finally smashed the ship to match- wood. . . . Now I’m building a Wanderboat, to be powered with a Dodge, suped up... - —and thank you Richerd Thornbury, for the will to experiment and the good humor to laugh it off. Most fellows in the experimental aviation racket are like you—good to the last drop. kal * Seems like the wind wagons have it this month. You fellows who have been good enough to send me pics of your projects can rest assured that if the thing is clear enough to make a good cut from we'll run it, and you can show your friends: \ | Mr. Ritchie Thornbury, of 95 Ravenhill Rd., Belfast, Ire- land, returned to the old country and built this Alco on a set of Heath Floats. It taxiied nicely until—it hit a stump! Wonder how many “Buddys” have hit the drink since the plans were published? ‘* a” kd Another letter from the wing wagon boys comes from Frank Howard, Jr., of East Palestine, Ohio, who, too, has a letter far longer than we can run. But I’m running the picture of his little buggy off here to the left, and here are some of le petit details, as we used to murmur in France. . .. The engine is a model A, the chassis is a model T. The conversion is like the Pietenpol Aircamper. No bearings changed, no thrusts or anything. We do 65 miles and can do 75 when a new carburetor is put on. This outfit sure draws the crowds around it. I have had several chances to use it for ad- vertising purposes. I am interested in aviation and have 14% | hours to my credit. I would appreciate hear- ` ing from all of you aviation fans, Yours truly, Frank Howard, Jr. E. Palestine, Ohio. And that, sirs, is all from the tool shop front for this month. You should see what I have for next issue!

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GEE IS very pretty—and look at her stunning figure! Suppose you should meet this lovely girl —would you dare ask her for a date? Or would you be self-conscious about your appearance? Would you be ashamed of your poor physique in comparison with her perfect beauty? Would you say to yourself, “What could a beautiful girl like that see in me? Why, she’d laugh at my skinny, funny looking body. Td look like a scarecrow alongside of her!” Get a New Body— Quick! Let me give you a new- body—a handsome, muscular, powertul body —in less time than you think possi- ble! Let me show you how easy it is to gain superb health, strength and vitality by my amazing new method of “MIRACLE EXPANSION”. No _old-fashioned, tedious exercise, no apparatus. This is the modern, quick way to develop a brawny, beautifully proportioned body. BOOK TELLS HOW gr my eye opening aml ok, iracles in s i A Learn how, “Miracle Pa Harty Titus, Director, sion” will make you over—will Tims School of Physical cover your body with inches Culture, Dept. W-2, of solid muscle—will give you 39 Union Square, West, thrilling, dynamic health. ` New York, N. Y. 7 Send your name and address today. Dear Titus: Send me ‘Miracles in Muscles”, explaining your new short-cut to health i I I r I $ { J S yf and strength through Miracle Expansion. School of Physical Nimesen dans int n ORAE Culture 39 Union Square, West, n Addresa R E Dept. W-2, New York City TOWN aster ss sens axaynouy mien ee Slatinei vss cll : Thank You for Mentioning Modern Mechanix and Inventions for February When Writing to Advertisers 15

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A depariment where that troublesome problem will be answered for your benefit as well as others. TWO MINDS—A SINGLE THOUGHT I have come to believe that the $1.50 I invested in your magazine in the form of a subscription is the best investment I have ever made. However, I have one suggestion to make: why not add an additional two pages fora sort of forum and let the reader comment on articles tead and learn how other readers react when they read certain articles—-R. D., Los Angeles, Calif. Maybe it was the influence of the stars or a case of thought transmission or possibly just plain coincidence, but the editors had the same idea a few days earlier. Well, here it is—a department for the readers. As many questions of a-general nature as possible will be answered here. Letters of praise and criticism are welcome, but all correspondence requiring answers must be accompanied by a stamped and ad- ‘dressed envelope. P : - IT WORKS AND IT DOESN’T Your B Eliminator on page 93 of the Dec., 1933, Modern Mechanix was the berries No more messing around with batteries. G. S., Westmont, Il v I constructed the B Eliminator and am only able to get 2 volts. I am using 60 watt lamps with 701A tubes. I have tried 99 tubes and 2 type 80 tubes. Have you tested this circuit?—H. H., Shreveport, La. The circuit was tested. If properly con- structed and carefully checked, the B Eliminator will work. H.H. should make sure the filaments light. It appears that a filter condenser in his output condenser is shorted. Installing different sizes of electric bulbs merely affects the output, not the rectification of the eliminator. W.G.S., of Saratoga, N. Y., who is also having some difficulty should follow the above sugges- tions. T.C.H. of Rusby, N. D., evidently has a shorted tube. Check the prong connec- tons and wiring. * Æ kod WHERE IS THE KNOCK? I have a Rockne that has a knock in it when you get up a little speed, but when it idles you can’t hear a thing. It appears to be in the third 16 or fourth rod. I took the motor down completely, checked the timer, oil pump, chain and every- thing, but found nothing. The dealer took it down four times and found nothing. Can you give me any advice?—P.A.M., Service Station, Danville, Ohio. It is difficult to determine the nature of the knock from this brief description. Test each cylinder for the knock. Heavy oil may eliminate it. Determine whether the knock exists when the car coasts downhill. If so the knock probably is in the rear end or the transmission, since possibility of trouble in the connecting rods has been checked. ka * * FORTUNES IN FUNNIES In Modern Mechanix’ November issue the article “How Comic Cartoons Make Fortunes” stated “today editors are eagerly looking for more cartoonists with better ideas or funnier cartoons. Will you kindly send me addresses of these editors that are looking for new material? —C.V.L., Catlettsburg, Ky. The statement that editors are eagerly looking for more cartoonists is a general statement. We have no list of editors who are on the lookout, but you can bet your bottom dollar if you have good ideas, all you have to do is submit them to the various syndicate home offices whose addresses you can get from your local-newspaper. z % * HOOPS FOR CANOES In the Aug. issue of your magazine, there was an article on a Desert Town Canoe. We are in- terested in constructing one and in fact have nearly all materials collected, with the exception of the barrel hoops, which we are unable to get in our town. Could you advise us where we could get them or what else we could use that would be as inexpensive? —L.C.,Jr., Mitchell, S. D. Ordinary oak slats can be gotten out to barrel stave size and then bent to any shape you want by merely putting them in a pot full of boiling water, letting them soak for a few minutes and then rapidly bending them while they are still hot. (Continued on page 18)

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: I HELLO, son. COME IN, DAD. |H WELL, SON, 1 DO KNOW L| FE Nor so BAD FOR | SPENDING THE 1 WAS JUST || THAT THAT SCHOOL WAS A BEGINNER. THERE'S Í EVENING AT YOUR)( READING THIS || TEACHING TAXIDERMY WHEN A LAMP THAT WILL LOOK WORK- BENCH AS AD OF THE WAS YOUR AGE—THIRTY DANDY IN MY DEN. USUAL? NORTHWESTERN |IVEARS AGO. 1 OFTEN WANT|| E GUESS I'LL ASK DAD SCHOOL OF TAXIDERMY. IL ED TO LEARN IT MYSELF. TO DROP OVER IT SAYS THAT MOUNTING. BIRDS / “TONIGHT AND VANE AT'S AS INTERESTING Á TAKE A LOOK "AS IT SOUNDS, I'M AT ; LEAST GOING TO INVESTI- GATE. AND 1 COULD SURE USE SOME EXTRA MONEY RIGHT NOW—ALICE, WANTS A NEW ‘DRESS’ AND VD LIKE A NEW Ay SAND I NOT ONLY MOUNT N ‘GROUP. I$ ONE | MADE EN :TROPHIES FOR OTHER SPORTS- FOR GREEN'S. SPORTING i =} MEN, BUT MOUNT MY BEST GOODS STORE FOR A WIN- || Ii ONES FOR THE DEN HERE. DOW DISPLAY. SO FAR. i PRN DAD, | NOW GET Twice I v UGH UCH FUN FROM MY HUNT- AIS MONTRA urea, ING AS | USED TO. YOU wouLDd} XQ ig : ‘AND MADE MY WORK-BENCH z TOO IF YOU LEARNED f WHY BOB, YOU PAY ME AN EXTRA 68— TAXIDERMY. H CERTAINLY DID Hi : JUST FROM “TAXIDERMY. = LipeOUND SiN GREAT, SON. i ; i A AN WHEN DO I BIN: EARNEST, DIDN'T J j z 1 YOU? 7 W A é ; START ? i | SURE DID.. I'VE MADE AND SOLD A BUNCH OF BOOK-ENDS MIRRORS AND $O ON TO HUNTERS FOR THEIR DENS, AND FUN? SAY DAD, TAXIDERMY'S, THE GRANDEST H OBEY IN THE WORLD! Fu n—Fascination—Profits Be a Taxidermist. All Secrets Revealed. Learn at Home Save Your Hunting Trophies Wild Game Not Needed Mount (stuff) expertly your valuable game-birds, Use common specimens; squirrels, rabbits, $ animals, fish, game-heads. Preserve them just sett” Hilctes ike Rese reren frogs. mone like life. That is Taxidermy. Learn at home by them In human and humorous positions. This is mall. Decorate home and den with nature’s art. craft and novelty taxidermy. It’s fun—and Make undreamed-of profits in spare time, in profitable. All included in our unique lessons. your shop. You can. Will you? Win fame as a It's marvelous. Write the schoo! this minute. i i i i From Your Sho taxidermist. Investigate. Mail coupon NOW. BIG : PROFITS in Space Time any students earn froin $40 to $75 month! Success Guaranteed n in spare time. Some earn thousands of ollam Tis old; relaps school has graduated 200, ne each year, Shor emen beng i thelr trophies to be students in Taxidermy. 30 years in business. Our : great success permits this guarantee, We know Novelty TODS Tor nomes, dens and for mer- we can teach you. It’s a grand money-making LEARN TANNING hobby. You must be interested, if you hunt or 'The lessons teach tanning harness, fish or have a work-shop. Ask for the free book sole, crome leather; also furs. Ex- g and learn all about Taxidermy. pert methods. Very profitable. Mail Coupon Or a postcard will do. No obligation on your part. Norti 1 of Tantd a The beautiful Book, with hundreds of entrancing Breen ence Omaha Hake ctures is Free ont miss your Only Chance to t once, f get this remarkable book Free and Postpald. Write Savane ‘Book ‘on ariastny wi out any bligati Teli me how I can today. State your Age. fearn Boientibe Taxi eaSermy al home, Northwestern School of Taxidermy f sen... 4732 Courtney Bidg. Omaha, Neb. Tei Thank You for Mentioning Modern Mechanix and Inventions for February When Writing to Advertisers 17

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MEN WHO WANT TO GET MARRIED! Most likely your income has been reduced. And yet — You and that girl of your dreams have the precious hope of facing life together! The obstacle is money — more money. Listen: Thousands of men, even in these times—men who faced the same problem that now troubles you—have learncd the secret. They’re making themselves more valuable on their present jobs, preparing themselves for the bigger opportunities ahead! They're doing it by devoting a portion of their spare time to study—-by mastering International Correspondence Schools Courses that are modern and practical in thelr training. Many of today’s business leaders started this very way. You can do the same thing—and realize that hope yeu hold so dear. It takes work and sacrifice—what worth-whlle thing doesn’t? The coupon will bring you good news—mail it today! “The Universal University Box 2316-V, Scranton, Penna, Without cost or obligation, please send me @ copy of your booklet, "Who Wins and Why,” and full particulars about the subject before which I have marked X; ` TECHNICAL AND INDUSTRIAL COURSES O Acohitect O Automobile Mechanic : O Architectural Draftsman O Plumbing — O Heating O Building Estimating O Air Conditioning O Wood Millworking Ü Sheet Metal Worker Q Contractor and Builder O Steam Engineer | O Structural Draftsman D Steam Electric Engineer O Structural Engineer D Civil Engineer O Electrical Engincer D Surveying and Mapping O Electric Lighting O Refrigeration | O Welding, Electric and Gas OR. R. Locomotives O Air Brakes O Reading Shop Blueprints O R. 'R. Section Foreman | O Telegraph Engineer D R. R. Bridge and Building Foreman O Telephone Work OR. R. Signalman O Mechanical Engineer oOo O Mechanical Draftsman D Machinist O Toolmaker CO Inventing and Patenting O Pattermmeker Highway Engineering O Chemistry O Pharmacy O Coal Mining Engineer D Navigation QO Boilermaker O Textile Overseer or Supt. O Heat Treatment of Metals O Cotton Manufacturing O Bridge Engineer D Woolen Manufacturing _ . O Bridge and Building Foreman O Agriculture O Fruit Growing O Gas Engines O Diesel Enginca O Poultry Farming O Radio O Aviation Engines ` O Marine Engineer BUSINESS TRAINING COURSES O Business. Management O Business Correspondence O Office Management D Lettering Show Carda O Signs OD Industrial Management O Stenography and Typing O Traffic Management O Civil Service O Accountancy and D Mail Carrier C.P.A. Coaching O Railway Mail Clerk O Bookkeeping D Grade School Subjects O Secretarial Work O High School Subjects O Cost Accountant O College Preparatory OSalesmanship D Advertising O First Year College D Service Station Salesmanship ( Illustrating D Spanish O Wallpaper Decorating D Cartooning O French O Lumber Dealer Salesmmuship Name. Address. Occupation If you resida in Canada, send this coupon to the International Correspondence Schools Cunadian, Limited, Montreal, Canada veci 18 Thank You for Mentioning Modern Mechanix and Inventions for February When Writing to Advertisers Problems (Continued from page 16) A BOAT FOR SMALL ENGINE I have an 8 H.P. Lockwood-Ash marine motor and would like to know if you have any boat designs that would be suitable to be powered by it. I would like to build a boat very much like “Scram,” “Wink,” or “Doane’s Hydrobout.” I have read “How to Build 20 Boats” from cover to cover and it made me a boat bug for sure.—B.A.J., Rock Valley, Iowa. ; Your eight horse Lockwood-Ash motor would not drive Scram, Wink or Doane’s Hydrobout at over eight miles an hour. To get twenty miles you would have to have a very light outfit. TROUBLE WITH SHORT WAVES . I built a short wave set like the one shown in March, 1933, Modern Mechanix, but it will not whistle or squeal, and gets only two stations.. I have the tube inside the set, otherwise everything was ae according to the plans.—E.P.H., Berkeley, alif. ee i Increasing the coupling of the coils by moving them closer together on the form, or even over- ‘lapping them a bit, should solve your regener- ation troubles. Be sure the different parts of the set are shielded and grounded as specified in the plans. If a metal shield around the tube will not give satisfactory operation, it will be necessary for you to put the tube outside the set, as specified in the plans. WET CELLS FOR “B” SUPPLY I have a six tube battery radio which requires two 45 volt “B” batteries in series. These are a considerable expense, so I would like to build a “wet” battery of sufficient voltage to handle this set. Could standard storage battery plates be cut into three parts, and placed in large medicine bottles for small cells? Would using three plates be better than just one positive and one negative plate? How many cells would be necessary for 90 volts? Could the cells be arranged so that they could be charged with six volt equipment? Does the volume of acid per cell matter? Will the acid have the same specific gravity in small or large cells? Will the reduced size of plates give satisfactory operation on my radio? —F.W., Abbotsford, British Columbia, Canada. : Of course, it is possible to construct a 90 voit wet battery as you suggest, using 45 separate cells, if you have the time, the ambition, and the necessary storage battery plates. It is possible to rig up a switching arrangement whereby cells can be charged with a six volt charger. The cells would have to be changed over from the series connection to a parallel com- bination of groups of three cells for this. The capacity of a storage battery depends upon the number of pairs of plates and the area of each plate. Two pairs of plates per cell should be about right for your purpose, for the drain upon plate supply batteries is relatively small. The acid should of course completely cover the plates. It will have the same specific gravity as in an ordinary storage battery. ape

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MAGIC FLUID mv) > RA PHOIDS _—~~ A UTOMOBILE, Airplane, ea Truck and Machinery. Owners! Think of it! A revolutionary discovery now “plates” lu- brication on all moving parts. Automobile owners, airplane pilots, engineers and other Col-gra users, are famazed at its action, “Like Magic” is the best description of it. REVOLUTIONARY DISCOVERY Added to the oil and gasoline, Col-gra seeks all fric- tion parts, where under heat, speed and pressure, it quickly forms an almost frictionless Col-gra’phoid surface. This means smoothness—quicker accelera- tion—amazing savings on gas, oil and repairs. Col- gra’s patented ingredients manufactured at 7500° assure positive lubrication. No motor heat too great. No temperature too cold. Gasoline cannot wash it off. It stays put! PROVEN BY TESTS On a recent test of.a Col-gra’phoided motor, four en- gineers ran an automobile, without the slightest 4 rie motor injury, for 29 miles without ‘oil, proving beyond all doubt the ; ability of this surface to lubricate J even in the complete absence of oil. ‘Laboratory tests further show the amazing difference be- RSA tween treated and untreated jfriction surfaces. , SALESMEN AND DISTRIBUTORS _Good Territory Open Col-gra is sold by filling stations, garages and ear dealers all over the country. Appointed distributors and their salesmen contact these dealers as jobbers in assigned territory. Men with automotive experience or proven sales experience in other lines needed to take over valuable territories which are still open. An unusual opportunity and a permanent con- nection. For further information check and mail the coupon. THE COL-GRA COMPANY Dept. 1514, 2621 N. 3rd St., Milwaukee, Wis. -a Thank You for Mentioning Modern Mechanix and Inventions for February When Writing to Advertisers "PLATED. LUBRICATION Re saves.on fi Gasoline. Oil éMotor Expense THE COL-GRA COMPANY, E Dept. 1514, 2621 N. Third St., Milwaukee, Wis. cx Gentlemen: Please send me full particulars together with your free 32 Page Illustrated Booklet. obligate me in any way. ( Check here if interested for your own car only. Check here if interested in Distributor’s position. o FREE OFFER COUPON! Tike FOR ITSELF Because Col-gra reduces friction, gives more power, frees valve action, reduces carbon, heat and wear, and prevents bare metal-to-metal friction, it gives motorists many added miles with less cost. Col-gra quickly pays for itself many times over in savings on repairs, motor fuel, oil, starter and battery. MORE POWER - PEP - SPEED Col-gra users everywhere are enthusiastic. “I am pleased with results,” writes Frank Eastwood. ‘The motor’s smoothness is almost beyond belief. . My mechanic says it can’t be the same engine.” Paul Canalizon: ‘‘Col-gra gives the car more power— speed—pep and gas mileage.” W, P. Barrows: “My ear runs much smoother, uses less oil and has more pep.” E. C. Bergman: ‘‘Col-gra helps the motor a whole lot—is working more freely and less vibration.” WRITE FOR FREE BOOKLET Every car owner—every user of machinery of any kind should know .about Col-gra “Plated” lubri- cation. Go to your dealer and ask for 32 page il- lustrated Col-gra booklet, or mail the coupon below and obtain this 32 page booklet free. This does not ige 19

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CALIFORNIA REDWOOD BURLS 9. 4° Ooms tennis This Burl is a growth of the famous CALIFORNIA GIANT REDWOOD TREE and when removed from the tree and placed in a bowl, in about one-half inch of water, it starts growing and sends forth the BEAUTI- FUL REDWOOD TREE FOLIAGE and brings the FRAGRANCE OF THE WOODS into your home. Chang- ing the water once a week and being careful they do not dry out is all the attention they need. You will enjoy watching them grow. As a house plant they have no equal, They are extremely hardy and will grow for years anywhere. They do not need any sun. The one illustrated is two years old. . ; The Burls are graded and sold according to size and thickness. The smallest size is about @2 inches * long, weighs about 4 ounces and sells for 25e. The next size sells for 50c and is somewhat larger and thicker. The next size is still larger and sells for $1.00. ; The Largest size at $1.50 is quite thick and heavy, is 6 to 8 inches long by about 5 inches thick and averages about 2 pounds in weight. 4 = ONS Willgrow for ears We cannot give exact measurements as no two are exactly alike in y = size or shape. Shipped prepaid. Johnson Smith & Co., Dept. 719 Racine, Wis. PLACE IT IN WATER—WATCH IT GROW 250 MAGIC TRICKS DEFENDER ALR Pe MADE An excellent little book A o 3 ar fom parlor oratace thet anya Used by police officers, detectives, one can do, Tricks with sheriffs, night watchmen and otherg cards, colna, bandkerchiefay YW asa means of self-protection. Very "gegga, bottles, string, eto 4 effective. Easily fits the hand, the ò Also Second Sight, Shadows | fa fingers being grasped in the four book ephir, Sto. Profusely ile | Soy d holes. Very useful in an emergen- RADIO BETS” showa how to ustrated. 100 postpaid, “ mae cy. Made of aluminum they are very Operate inoxpensive Radio Sets; the ma-| 125 GARD TRICKS snd sleight of hand. é Tight, weighing less than 2 ounces, teriala for which can be purchased for a mere | Containa all the latest and best card tricks aa 4 Handy pocket size always ready for instant use. trifle, Also tella h to build hort- içi 7 rT iver for bringing in foreign. stations, Poctre oF ora teeks aan faalo ” Price25c ea., 2for 45c postpalde 770 page Catalog 10e. ships at acas oto. ONLY 15c p.nd. I gamblers. Price 25Gpostpaid, oretampss -SURPRISE MATCHES AES 35¢ LOOK: ismene. More fun than fighting with your Greatest BmalleetDible Fy Pica iGse BOG fa j wife. Look Just Sheera pest: I A or H |like ordinary amp, IA rt ' :matches. As tha O Pages. ||“ £ A Bal | victim tries to light Bald to bring one‘he gets quite a p 7 i a Ba | gurprise, z ; i Everybody de- asanine work Ps raed | | Pt ico 10c per box, 9 boxes for-26c, 12 for 75 cenlo, 4 7 lighted with it. wean to be Make good money STAR TOY MAKER | Biv A O44, Curlous and interest- selling them to 3 - soquaintances, Greatest boya’ boot À ing. Lotsof pleasure as well eto, PRI > 3 for 400, 12 fot written. Tells bow to make 89 yery useful. It isa double Microscope for ex- $1.95, 100 for $7.80,. Alo obtainable in 8 Pinhole Camere, s Ca. &mining the wonders of nature. It ig also: an Leather Binding, with zoid edees. Price S00 h model Railroad, @ a Glass, a Bi ne, & Read! baoh, 3 for $1.25, $4.80 per doz, Magol- phone, Boomerang, f , , & Btereoscope, a Burning Lens, 8 ng fying Glass far use with Midget Bible 150 i granb RREN R £ A aeta oram AA y potoso and throat. it a . cebine > ear, e SERPENT’S EGGS Icroscopo. EleotE, já is worth all tha cost to locate eton one painful cinder in the Box contains 19 agza, When 5 Water Wheel. Paddle Raft. a pair of Skla, (Co; „Folde flat and fits the pocket. Something great—you sly ti EST ga Bt 1o8 Tmt ae BE [ee Se 9 foe spake severai F à TERES alee EE O : which i S BOY'S OWN TOYM 3 : E i Rd eg | a nest naa eee ot ea EESTEC MOTOR lifelike manner . Siim 5 toya, cardboard toya, boste, traps, atu. 200A A 3 An Events, Sounds simnost unbe- rice Der box. illustrations. Price 25c postpaid. 2 Hevable, but it ia perfectly FUN WITH MAGNETISM. 50 novel and : 4 y „For ONLY 10cents we PUN: WITH MAGNETISM. 50 novel and a r y send yon all the parts neces- Withabunch | usiaue experiments in MAGNETISM that Bary awii of these bills, aor you aan perform with the packedin aneat boxw h -it is tor | g Es} bid of on ordi magnet: - fall prin for a: aeia £5 easy magnetic chain, feeing and i my rections for assembling- each | eraon Z rinnig needle, nail and : trouble ateitpatiing hepa of limite A ball cluster, magnetic fish 6 means to | top, motor, magnetis biliard bille, many ‘other Justfollow S few simple BDDESE| Stunts. Also interesting information about $ fı ata the igdostono, magnetiam, eleotrio ty, etc. PRICE Da “motor ‘is ready a p-pds X ba to ron. BOOK ON BOATS, How to build rowing, | A% : £ > a sailing boate, Everything pertaining to bosta à Price aia: 10c explained in plain terme so anzone can undere postpaid, stands Illustrated. 100 p.pd. time and peeling off a genuine bill new easy self-teaching method. Teaches how LEARN to or two from the outside of the roll, | ¢ Bley, to ue the tongue, tremolo, fully i With the aid of t f 2 illustrated. Price 15c postpaid, the effect created will be found tO | MONEY MAKING SECRETS. Golden Spro. book EN Hypnotize be all that can be desired. Prices, | iuniti 64 ated postpaid: 40 Bilis 200, 120 for 0c, | aaea aaar aa idea red 7 IASON. Thisremarkablo or š formules, wrinkles, trade seorets, ete, Busi f $3.50 _ thousand postoald, | RE tiat oen bo otaded pith litis or to] | g Da Pie boak fells how capital at home in spare time. _10c postpald. Buc cesefal in NOSE FLUTE | thicks-2-sociac ENTERTAINER. Con. > buainess? Will 4 about Hypno- The Magio Nose Flute,or Hu» | taina hundreds of simple tricks, illusions, di- = yoube wealthy? tism, how to manatone, is a unique and | Versions that anyone’can do. Also explains | ka Complete with |: hypnotize, how novel musical instrument that | secret of second eight. Price 250 postpeld. : j dictionary i to produce sleep, how to is played, with nose and mouth WONDERFUL X. RAY TUBE 7 med. Thare i = descriptions and correct interpreta- | awaken a subject, how tonyp- omits kanok” a playing : A monderfullittia tions, vith fucky anaes torta: notize animals, hypnotism in woth, When once ace Bey strument pro-|? 0 , , 5 | diseases, hypnotism for scien- gqused alter lietie prac; madd ducing optical r by curiae tnodo, ‘Ey | tife practice, illusions and produce very sweet $ Nlusions bothl¢roands of coffee or tea, by domin- | halucinations, personal mag- muafo that somewhat à Burprising 8nd joes, by marks, ecars or moles, mis- | netism, thought transference, resembles a flute. There |. startling. With it|¢cellaneoue games with carda, lucky | etc. Written in plaln, everyday da no fingering, nnd once you have mastered |. yoq gan ese what is rently the bones of days, weeks , months, years; howto | Janguage that an: Body ‘can under- d di ith facili A »|Fecelve oracles by dreams, finger |: x iS it you ean play all kin ide of musio wi facility your fneorn, tho le a lead pe poll, the ine rece eaea by dr RE he stand. PRICE 10c postpald. Wael JOHNSON SMITH & CO, FORTUNE TELLING BY CARDS REVU went. 719 , RACINE, WIS. ———— Book shows how to tell fortunes i K 4 with cards, dice, dominoes, crystal, A cony of our NEW CATALOG mafied on‘recelpt of 10c, or th jes! z xe Edition with cloth binding 2: ¢-Blggerand betterthan one, Pe: d ote eat eee eter alee ! ok of its kind În existence. Nearly 800 pages of all the latest tricks 4 | | JOHNSON SMITH magic, the newest novelties, puzzles, games, sporting goods, : ferent methods explainad and fully e sant Sc unprocurania-oicewhore. damit enigen Ingea or to cover with complete Taforma- {e naon ; 3 wi a oin, Money| er to cover with complete informa- j rder, Check or unused U. S. Postage Stamps, for all | $ ed above. Canadian money, stamps and Postal fotos decected st aN tion on. fertune-telling. PRICE 100 current rate of exchange. peaa postpaid, Stamps accepted. Address orders for all goods on above and on following page to JOHNSON SMITH & CO., Dept. 719, Racine, Wis. D-2 -Qi 20 Thank You for Mentioning Modern Mechanix and Inventions for February When Writing to Advertisers

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REAL LIVE PET TURTLES Blank Cartridge Pistol Sent by Mail for Only, A Fascinating and Interesting Pet If youvant a fascinating and interesting little pet, just risk a quarter and we wlll send you a real live PET TURTLE by mail postpaid to any part of the U.S.A. Now all the rage. Thousands upon thousands of these Turtles were sold at the World’s Fair in Chicago. No trouble at all to keep, Just give it a little lettuce or cabbage or let it seek its own food. They aro extremely gentle, easily kept and live for years and years. Needs less attention than any other pet. Get ona or two. Study thelr habits. You will find them intensely interesting.. ONLY 25c each sent by mail. Safe, Ilve delivery guaranteed. Electric Telegraph Set BOYS f A private Electric Telegraph Set of your 1 5 c ® own for 15c. Lots of fun sen messages to your friends. Better still get two sets, hook them up as shown in the directions, for TWO-WAY MES- SAGES (sending and receiving). No trouble at all to operate with the simple instructions that ac- company each set. Operates on any standard dry battery obtainable every» where. With this outfit you can learn to transmit and receive messages by Ay on f- the Morse International Code, and in a very short time become an ex- ; ort operator. Mounted on wooden Base measuring 4 x 3 in., first class construction throughout, complete with key, sounder, magnet, min- iature Western Union blanks, packed in neat bor, with full illustrated instructions — ALL FOR 15c (without battery) postpald (Canada and Foreign 20c.) 7/0 page catalog of movolities, jokes, tricks, puzzles, books, etc. 10c. JOHNSON SMITH & CO. Dept. 719, Racine, i age, RA RASH 10c Add 100 for 64 age book all about eleotricity written specially for boys. Tells how ¢o make batteries, dy- Amos, moto radi elegrap PATALUAy telephones, lights,electrio elle, alarms, coila,eleotria engines, PRICE 100ppd. NEW s VAMPING 2 CARD Š 1 > NO TEACHER NEEDED--SURPRISINGLY SIMPLE SYSTEM Persons having neglected their Musical Education need not despair, for with the aid of our new VAMPING CARD (pħcing the card upright over the piano keys), you can Vamp away to thousands of Songs, Ballads, Waltzes, Rag Time, etc., etc. No knowledge of music is required. After using it a few times, you will be able to dispense with the aid of the Vamping Card entirely. The price of this very clever invention is only 150 postpaid. BIG ENTERTAINE FUN, MAGIC and MYSTERY ge 326 Jokes and Riddles, 25 Magic Tricks, J 10 Parlor Games, 73 Toasts, 13 Fairy Ẹ Tales, 105 Money-making Secrets, 2 Monologues, 21 Puzzles and Problems, 5 Comic Recitations, 10 Funny Readings 1i Parlor Pastimes, 13 Flirtations, 1116 |f Girls and Boys Names and their Mean- —& x ings, 10 Picture Puzzles, 69 Amusing Rhymes, 37 Amusing Experiments, Deaf and Dumb Alphabet, Shadow; phy, Gypsy ‘ortune Teller, How to tell Fortunes with Cards, Dice, Dominoes, Eryatal, Coffee Cup, ete., Hypnotism, Ventriloquism, Cut-outs for Checkers and Chess, Dominoes, Fox and Geese, 9 Men Morris, Spanish Prison Puzzle, Game of Ana- crams, 25 Card Tricks, Crystal Gazing etc, ALL FOR 1S CENTS POSTPAID fammoth 710 page Catalog of novelties, jokes, tricks, puzzles, etc., 10 Cents. JOHNSON SMITH & CO. Dept. 719 RACINE, WIS. LATEST | || CATALOG | OHINION SMITH bco, | ; RACUNE WIS. yin Pevolvers; Fine for áth July, New Y: work, starting pistol, etc. SMALL SIZE 4 in, tong 25c. MEDIUM SIZE 5 In. long 50c. LARGE SIZE 6In. long $1.00. BLANK CARTRIDGES 50c per = 100. HOLSTER (Cowboy type) 50c. Shipped by Express only, not prepaid. 710 page catalog of other pistols, sporting goods, ete. 100 Novelty French Photo Ring THROW YOUR VOICE PISTOL CIGARETTE CAS REVOLVER STYLE ___z 25c Three new models now out 25c, 50¢ and $1.00. Well made and effective. elled on pattern of latest type of Revolver. Appear- ance alone enough to scarea burglar. Takes 22 Cal. Blank Cartridges obtainable everywhere. Mod- Great rotection against burglars, tramps, dogs. Have it § around without the danger attached to other ears, for stage Here is a very great novelty in Rings, that is selling in thousands. Jt is a nicely made ring, finished in imita- tion platinum, and set with a large imitation diamond It looks just like an ordi- nary ring, but in the shank of the ring is a small micro- scopic picture almost invisi- ble to the naked eye, yet is Magnified to an almost in- credible degree and with as- : tonishing clearness. There is quite an ajs sortment of pictures that should suit all tastes, Some are pictures of bathing girl beauties, 3 pretty French Actresses, etc., others are views of places of interest in France, Panama Canal and elsewhere; others show the Lord’s Prayer in type, every word of which can be read by persons with normal eyesight. They are inter- esting without being in any way objectionable. PRICE 25c, 3 for 65e, or $2.25 per doz. postpald. 7,0 pageCatalog 10c. BOYS! 2 4 TF, Into 2 trunk, under the bed or 3//2/§ anywhere. Lots of fun fooling 7 v, teacher, policeman or friends, $ THE VENTRILO a little instrument, fits in the mouth out of sight, used with above for Bird Calls, ete. Anyone can use it. Never fails. A 16-page course on Ventriloquism together with the BVentrilo. All for 10c postpaid. x It looks like a deadly weapon, but it fe merely a novel Cigarette Case. This clever contrivance bas proved itself better than the real thing Io many an awkward encounter. Great fun “sticking up” your friends. They squirm end protest it might be loaded. Pullthe k trigger and the slide fileg open disclosing the ciga- rettes. Well made, light and compact. Weight Ny only 2 ounces. i PRICE i PostPaio 29C An amusingfand entertaining novelty, Hold it over a women’s hand and it is supposed to describe e complete and vontinuous circle. Hold it over a man's hand and watch St move back and forth like a g pendulum. We have made P innumerable testo, and while we have never been able to figure out how it's done, wa have never seen it fail Many Menta may be performed with, s w it, Try it for testing the ser of animale, cate, dogs, rabbite, butterflies, ete-Sold ag B patent egg tester in Europe, PRICE 10c, 3 for 25c, 75c per doz. p-p._ > Boy Electrician with 76 illustrations for Mak- ing Batteries, Dynamos, Mo- tors, Telegraph apparatus, Telephone, Lights, bells, DICATOR GÀ Alarms, Coils,‘ Wireless” Current Reverser, Electric A copy of our NEW CATALOG melled on reecint of 100. 7 R Ws , L Edith í] inding 2: d better th Engine, Radio, etc. By electrical experts so that anyone can under- book of Ite Rind in oalon E Nearly G00 paces of ail the stand it. 64 pages. PRICE ONLY 10 CENTS POSTPAID. ye HOW TO PITCH CURVES ich ois fede yer, 28 hg" esting Biz jor all article League Pitchers. Clearly illustrated ond described with 56 pictures. 25€ mpi l cepted at current rato of Exchange. JOHNSON SMITH & CO., DEPT. 719, RACINE, WISCONSI Address orders for all goods on above and on previous page to JOHNSON SMITH & CO., Dept. 719, Racine, Vis. ; akoe- - ngu Thank You for Mentioning Modern Mechanix and I nventions for February When Writing to Advertisers 21

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CLASSIFIED ADVERTISEMENTS Rates for classifled ads, 10c per word per insertion. order. Mechanix and Inventions, 529 7th St. South, Minneapolis, Minn. ADVERTISING AGENCIES ADVERTISE: 24 words in 250 news- papers $10. Lists Free. Advertising Service Bureau, 4650 Drexel, Chicago. WANT ADS that get the business com- posed—$1. with order. State proposi- tion. Truett Nance, Hallettsville, Texas. FREE NEW 1933 advertisers rate guide, Brown Advertising Agency, 140 South Dearborn, Chicago. AGENTS FREE literature describing many mon- ey-making plans. D-Belfort, 4042 N. Keeler, Chicago. DISTRIBUTORS—Agents: Patented water pump tightening support for Ford Model A and AA. Stops leaks, end lay and wear. Sample 55c. F. P. adress Co., 302 E. Vine St., Kalama- zoo, Mich. MAKE MONEY. Collect $6, keep $5. Two quick selling dollar per month “hard times” life policies. Great North- ern Estate Corporation, Department C, Rockford, Illinois. AGENTS WANTED BEST SELLERS. Cigars, gum, latex; carded goods, toiletries, necessities; blades_65c hundred; samples, catalòg 10c. Easterncity Sales, Capitol Bldg., Chicago. CASH income daily resilvering mirrors at home. Replating autolight reflectors, -tableware, etc., outfit furnished. Write Sprinkle, Plater, 850 Marion, Indiana. BIG MONEY applying gold initials on automobiles. Easiest thing today. No ex- perience needed. Free samples. “Ralco,” 1084 Washington, Boston, Mass. BIG MONEY and Fast Sales. Every owngr buys Gold Initials for his auto. You charge $1.50; make $1.45. Ten orders daily easy. Write for particu- lars and free sample. American Mono- gram Company, Dept. 11, East Orange, New Jersey. AGENTS. Smash go prices. Coffee 12c Ib. 4-0z. Vanilla 814c. size Tonic 14c. Razor Blades 5 814c. 100 Sticks Chewing Gum 12c. Christmas Cards, 21 in box, 14e. 150 other bargains. Experience unnecessary. Write, Carnation Co., MN, St. Louis, Missouri. MAKE PRODUCTS yourself. Tested formulas. Catalog free. Grinstead Lab- oratory, Edwardsville, Illinois. MEN WANTED at once to call on stores with newest line self-selling 5c and 10c necessities. Strong, original counter displays. Aspirin, Mercuro- chrome, razor blades, household cement, ete. Automatic sellers. Many new items. Up to 125% profit. Big catalog Free. Procopax, Dept. 95-R, 1956 S. Troy, Chicago, GOOD income plating auto parts, re- flectors, mirrors, by new method. fits furnished: free particulars. Gun- metal Co., Ave, A, Decatur, Il. AGENTS’ Gold Sign Letters for store windows. 500% profit. Free sample. Metallic Letter Co., 426 N. Clark, Chicago. sont 22 AIRPLANES WANTED: Light airplane. Cracked up ship. Fuselage, motor, wings and props. Bruce Orton, Griswold, Ta. AVIATION METAL tipped propellers; Fords, $9.98; Henderson, $8.98; Harley, untipped, . $4.50; Super Heath Ships, a steal at $198.00; Bristol-Cherub Type 40 H. P. motors, $98.00. Photos, information including leather bound flying manual, 25c. Hibbs, Ft. Worth, Texas. SPECIAL sale on fifty SB propellers all sizes, prices $2.00 to $14.00. Send dime for very, latest list, Department M.M. Sensenich Bros., Lititz, Penna. BROTHER can you spare a dime? If you can send it to me and I’ll send you my 1933 low priced Aviation material catalogue. Karl Ort, 700 W. Poplar St., York, Pa, ENGINEERING Service for Small Builders. Stress analysis, airfoil lay- outs, ribs, wings, fuselages to order. Send dime for complete list and service plans. AES 3242 South Springfield Ave., Chicago, Ill. | AVIATION—Young men interested in entering aviation as apprentices. Write, enclosing stamp, to Mechanics-Universal Aviation Service, 12883 Mansfield, Detroit, Michigan. PROPELLERS for Airplanes, Ice or Snow Sleds. Highest performance at low cost. Order now to avoid big rush. Circular 3c stamp. Lorenzen Propellers, Niles, Mich. USED AIRPLANES $85 and up. Catalog 10c. Federal Equipment, Deerpark, Ohio. ARMY AIR Corps gives one year free flying course, 250 hours solo flying, salary while learning, Send 20c for in- {formation booklet telling how to qualify and apply. Federal Equipment, Deer- park, Ohio. MOTORS, propellers, hubs, wheels, axles for iceboats, midget cars. Circu- lars 10c. Storms Aviation Co., Ashe- ville, N. C. BUSINESS OPPORTUNITIES $$$$ $40,000—-I made it. Plan 10c. ““MooreMade,” Lapeer, Mich. TATTOOING Outfits, Supplies—Cata- logue. Guaranteed Remover. ‘‘Waters,” M-965 Putnam, Detroit. PREPARE for prosperity—our twenty week electrical engineering correspond- ence course attracting worldwide atten- tion—Basic electrical, radio, public-ad- dress, photo-electric theory covered— Experimental laboratory apparatus free with course—Attractive tuition rates— Delayed payment plan for jobless men —Write Lincoln Engineering School, 855-L- South 37th St, Lincoln, Ne- braska. ‘QUICK MONEY—Made with Tested Plan. It Works. 25c. Jones 688, Har- vard St., Akron, Ohio. DOLLARS in your mail, operating mail- way business at home. Start small, grow hig. Write, Mailway System, 1418 Peden, Houston, Texas. Minimum .10 words. Closing date first of second month preceding date of issue. Address Classified Mgr., Modern Cash should accompany AMATEUR cartoonists, earn $25.00 week, spare time, copying cartoons for advertisers. Three-M Syndicate, Argyle, is. fe S EN S THE PLASTEX Industry needs manu- facturers on small scale and for big prò- duction of Art Goods, Novelties, Souve- nirs, etc, in Plastex and Marble imita- tion. Experience unnecessary. 2c ma- terial makes 25c articles. Rubber moulds furnished for speed production. We place orders and buy goods. Small in- vestment brings big returns. Interest- ing booklet mailed free, Plastex Indus- tries, Dept. R, 1085 Washington Ave., New York. OPERATE Chain of vending and amusement machines. Be independent for life. Start small, grow big. M. Goodbody, 1826 East Main St., Roches- ter, N, Y. 1000 WAYS to make money book, for- mulas and trade secrets for every manu- facturing line. Tlinois Universal, 800-M, N. Central Ave., Chicago. WISE MEN Get Money Easy! Plan c. “Mooremade,” Lapeer, Mich. EARN Money with our 87 proven money-making plans. 2c stamp for particulars. Kryst Bros., 1641 W. 57th St., Chicago. SUCCEED with your own products. Learn how. Formulas, processes, analy- tical service. Formula catalog free. A. Thaxly Co., Washington, D. C. LIQUID MARBLE — Anyone can make! Applied with brush or molded. Rubberlastic molds; liquid porcelain; composition_flooring, Big money mak- ing these! Particulars free. Rapid ser- vice, Edwardsville, I!inois. SELL by Mail. Books, Novelties, Bar- gains! Large Profits. Particulars free. H. Elfco, 525-S Dearborn, Chicago. 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. MEN—WOMEN interested money home, write for details. F-277 Broadway, New York. MAKE products yourself—tested for- mulas. Catalog free! Grinstead Labor- atory, Edwardsville, Illinois. MAKE MORE sparetime money! Send dime for 48 pages of amazing money- making opportunities and offers- Spare time selling, box four-MM, Cleveland, Ohio. i I WANT to send to all ambitious men and women Free details of the only workable, practical; different home work plan I know anything about. A positive winner. ‘“Thalinger’, 1144 Aubert, Dept. C., St. Louis, Mo. DRAINED auto oil, 1c gal. at gas sta- tions can be made into 100% perfect heating oil. Simple easy instructions and other plans complete 25c. H. R. Ireland, Box 5724 Olney, Phila., Pa. earning Eller, Thank You jor Mentioning Modern Mechanix and Inventions for February When Writing to Advertisers

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BUSINESS OPPORTUNITIES MONEY making opportunities. Books full of money making ideas. Free liter- ature. M. Diaso, 1546 C St., Fresno, Calif. : . PROFITS! Immense, expanding, no soliciting. Get startling facts! Mc- Arthur Co., Desk 19, Butte, Montana. LEARN Scientific and Swedish Mas- sage Special $20. Diploma. Sample les- son $2. Dr. E. B. Lieber, D.C., 1526 Wilshire Blvd., Los Angeles, Calif. MAKE MONEY. Simple plan_ that really works, 10c. Laitiner, 362 W. 23rd St., New York City. LEARN marbleizing: with snow white vitreous cement. Brushed or sprayed on concrete products, wood, anything. Decorating and casts. Produces high gloss, Rubberite flexible molds allow undercut. Suitable for novelty business. Cellotex brushed on all molds makes thin transparent Celluloid film. Stands 200 Fahrenheit. Dime brings Rubberite pattern, marbleized cast of snow white cement. Other assorted samples, illus- trated literature. Cowell Institute, Grayling, Michigan. MANUFACTURE—Sell your own heverages, extracts, candies, soaps, per- fumes,. etc. Free booklet. Truway Lab- oratories, 1623 W. Grand, Chicago. oratories, T949 Ne at ins ed ABS O 300,000 ARTICLES. Wholesale direc- tory 10c. Ireland, Box 5724 Olney, Phila., Pa. BIG MONEY for you. Make, sell, rinting cuts. Tremendous market. earn quickly, amazingly easy copy- righted process. Write for free speci- mens. Hughes Products, 36 Miami, Terrace Park, Ohio. BOATS BUILD a boat this winter. Frames fully assembled and all other parts cut to shape. Send 10 cents for catalog. Welch Boat Company, 3264 North 33rd Street, Milwaukee, Wisconsin. BOXING ao OA o LEARN boxing. Complete illustrated instructions 25c. Wrestling 25c. Jiu- Jitsu 25c. Prof. Dryer, Rox 1850, Chicago. paein BOOKS MULTIPLICATION and Division made easy. The Math Pony—200 page book—90,000 Partial Products—com- plete with rules, saves mental effort, time and errors. Essential as a dic- tionary. Paper cover $1.85; Fabrikoid $2.50. Ten day return privilege. Box 1810, Milwaukee, Wisconsin. BOOKS, books, books, no matter what you want in the book line I can fill our order. If you can not find the Books you want let me know today. Levi Bryant, 654 East 44th Street, Chicago, Ii. a a CAMERAS FREE! Our new bulletin! Telling you how to make money with your camera and how to develop and print your own pictures. Thousands are deriving sub- stantial incomes in this pleasant man- ner. Send for your free copy and find out how. Central Camera Co., 230 South Wabash Ave., Dept. MME-2H, ee E E Chicago, Ill. CAMERA and PHOTO SUPPLIES MAKE Money in Photography. Learn quickly at home. Spare or full time. New plan. Nothing like it. Experience unnecessary. American School of Pho- tography, Dept. 2047, 3601 Michigan Avenue. Chicago. CARNIVAL GAMES MAKE you money—Outfits supplied, catalog 10c. ‘‘Mooremade’’, LaPeer, Michigan. _ 5 dit Thank You for Mentioning Modern Mechanix and Inventions for February When Writing to Advertisers CHARTERS DELAWARE Charters; fees small; free forms. C. Grant Guyer, 901 Market St., Wilmington, Del. CHEMISTS JOIN international chemists league, in- formation bulletin 10c. 816 E. North Street, Lansing, Mich. DRAWINGS CHARACTER drawing from your photograph, 50c. Stamps accepted. Fulton Studio, Bx. 600, Cleveland, io. DETECTIVES COUNTERFEIT Detector, valuable to merchants Fedworks, 1947 S., Lincoln, ebr. ; FORMULAS—Interesting Literature: Free. D-Belfort, 4042 Keeler, PLASTIC wood, plastic leather, mend- ing fluid, auto veneer, see-clear. All five formulas for $1.00. Prenzel, 561 E. 89 St., Brooklyn, N. Y. FORMULAS—all kinds. Guaranteed. “Kemico”, B-16, Park- tory, Edwardsville, Illinois. 3,000 FORMULAS, facts, processes, trade secrets in Dr. Brown’s Book of Formulas, 380 pages. Price, postpaid $1.00. Ogilvie Publishing Co., 57 Rose Street, Dept. 4, New York. FROG RAISING DETECTIVES. Earn Big Money. Ex- cellent opportunity. Experience unnec- essary. Particulars free. Write, George Wagner, 2640-V Broadway, N. Y. BE A Detective. Make secret investi- gations. Experience unnecessary. Write United Detective System, 1623 W. Grand, Chicago. DUPLICATORS DUPLICATING Machines $3.85 to $95. Rotary Stencil, Clay Composition, Gelatin Film. Most Complete Line in America. Photo-Litho Folder Pittsburgh Typewriter Supply, 551, Pittsburgh, Pa. STENCIL DUPLICATOR—Anyone can make. Particulars free. Rapid Ser- vice, Edwardsville, Illinois. ELECTRICAL APPARATUS BANKRUPT STOCK—950 electrical experimental kits—designed for 110 volts AC—kit makes motors, telephones, detectophones, burglar aterms, lights, etc. Original cost $1).00. Sale price $1.99. Other outstanding electrical argains. Greatest values in history salvage sales. Catalog, stamp. Lincoln Engineering Co., 855 So. 37th St., Lincoln, Nebr. ELECTRIC EXPERIMENTING EDUCATIONAL. Entertaining. Elec- trical laboratory experimental kits, six- teen valuable pieces, $4.89. Seven piece kits, $1.77. Hand driven A.C. genera- tors, 91c. Microphones, 44c. Detecto- phone kits, $1.74, ete. Instructions with all. No toys (Western Electric, Kellogg, Stromberg-Carlson salvage equipment). Jewell meters. Bargain bulletin, stamp. Engineering Service Company, 3724 ‘A’ Street, Lincoln, Nebraska. ELECTRIC EYE—Build your own for less than forty cents. 200 fascinating experiments. Plans and_ specifications 25c. Albers Bros., 3834 Humphrey St., St. Louis, Mo. EXPERIMENTERS FREE! For six months! “Science- craft” magazine. For students, scien- tists, experimenters. Send 25c for post- age. M-5049 Bernard, Chicago. FINGERPRINTS FINGERPRINT experts required; va- rious branches government; large cor- porations; particulars free. American System. 2640-Y Broadway, N. Y FORMULAS 3,000 FORMULAS, facts, processes, trade secrets in Dr. Brown’s Book of Formulas, 380 pages. Price, postnaid $1.00. Ogilvie Publishing Co., 57 Rose Street, Dept. 4, New York. FREE Formula Literature, manufac- ture products yourself. Thomson’s Ser- vice, 7309 Pingree, Chicago. RAISE FROGS for us! (spare time!) Little water. Little space. No food to buy. We pay $1.00-$3.00 dozen. Illus- trated book “Fortune in Frogs” free. American Frog Canning Company. (119). New Orleans, Louisiana. HYPNOTISM HYPNOTIZE instantaneously! New dollar book 25c. Lonk Institute Hypno- tism, D-1313, Palatine, Illinois. ICE BOAT FLASH across ice in rocket ship! Gives you thrilling ride! Driven by nine powerful rockets. Cheaply and quickly built, Illustrated guide $1. Thermo-Reaction Co., 326 Hickok Ave., Syracuse, N. Y. INVENTIONS INVENTIONS Commercialized. Pat- ented or unpatented. Write Adam Fisher Mfg. Co., 582 Enright, St. Louis, Missouri. INVENTORS! We can assist you to make money from your ideas. In- dividual service always. Roesch & Associates, Inc., 120 E. Washington Street, Syracuse, New York. INVENTIONS—Patented, Unpatent- ed. We buy outright, royalty. Grant- Dacanay Co., Hewes Building, San Francisco, California. INVENTORS INVENTORS—Sell before atenting. Free particulars. Write . Greene, 942 Barrister Building, Washington, D. C INVENTIONS now salable before patenting. Safe, practical. What have you? Chartered Institute, 598 Barrister Building, Washington, D. C. CASH and royalty for inventions, pat- ented, unpatented. Herschel Bon, 10 Tremont. Boston. JEWELRY LEARN Watchmaking. Beginners’ tools, practice movement, instruction 50c. Watches 15¢ up. Complete lists 5c. Stewart Watch Co., Carleton Build- ing, St. Louis, Mo. MAGIC LEARN MAGIC. Large illustrated catalog of tricks you can do, 25c. Holden, 222 W. 42nd St., N. Y. CURIOUS BOOKS, novelties, 132-page catalog 10c. relle, 159.NOM. Bate Chicago. MAGIC GOODS MAGIC catalogue. Wonderful knock- out card trick. 10c. Singer, 444 Han- cock, Wisconsin. BARGAIN! 250 magic tricks—with cards, coins, handkerchief, egg, ring, glass, etc. All 45c coin. ruhe, Crocker Ave., Piedmont, California. igoe» 23 your inventions magic,

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CLASSIFIED ADS MAGIC, TRICKS AND NOVELTIES JOIN “Magicians Club”. Send two dimes for catalog, membership card, club pin and puzzler. Palace of Mys- tery, Box 85, Hollywood) California. MALE HELP WANTED FOREST JOBS easily available, $200 month. Cabin. Hunt, trap, patrol. Get details immediately. Rayson Service, K-32, Denver, Colorado, MEN wanting jobs on new construction work in U. S., So. America, write E. Moore, 1843 Hunter Bldg., Chicago. Enclose stamp. MALE HELP MEN or Women! Look after local Coffee and Tea Route. Call on homes with 300 highest quality necessities. Spare or full time. No investment. Permanent, Good’ starting pay. Rapid Blair Laboratories, Dept. T-4, Lynchburg, Va. esi teat a O L a L IF YOU want a wonderful opportunity to make $8.50 a day and get a new Ford Eight Tudor Sedan besides, send me your name immediately. No contest or lottery, Particulars free, Albert Mills, 4426 Monmouth, Cincinnati, O. ` _MALE—INSTRUCTION DETECTIVES. Work home or travel. Experience unnecessary. Write, Ameri- can Detective Institute, 2640-T, Broad- way, N. Y. MERRY-G0-ROUNDS MERRY-GO-ROUND S—New and sed Outfits—Catalog 10c. ‘Moore- made”. EaPeer, Michigan. MISCELLANEOUS FINANCIAL independence. Don’t wish or it. Do your part. Answer this. Gardar, 3026 Tenth Ave., Los Angeles. PROFIT from newspaper clippings. Send 10c coin for instructions. George Bile, 1469 W. 32nd‘ St., Indianapolis, nd. | $2.30' and receive 5 attractive aspirin display cards. , Retail value $10.60. Ideal Co., Mckinney, Texas. MODELS è YOUR Ideas developed into practical, working model. 30 years successful experience; thousands satisfied custom- ers. Confidential service guaranteed. Bank references, Send 3c postage for 32 page book “Making Inventions Pay.” Crescent Tool Company, Dept. T. Cin- cinnati, Ohio. MODEL MAKERS MODEL MAKERS—Brass, copper, fibre, steel and aluminum in all shapes, also castings, gears, screws and fittings. Catalog 10 cents. Experimenters Supply House, Dept. M, Box 10, Station Y, MODEL ENGINE SUPER Fast 34’? Hornet, and Metre “Falcon” Hydro Hulls. 1 lb. 34 gasoline_motor, miniature ignition out- fits for Model Boats. Catalog 20c coin. E Loutrel, 96 McDonough St., Brook- yn, : | MOTORCYCLES SEND 15c for illustrated used Motor- cycle catalog. Large stock. Bargains. Indian parts. Accessories, Indian Mo- torcycle Sales, Kansas City, Mo. MOTOR WINDING DATE MOTOR WINDERS: Winding date, 100 AC motors, special selection, va- rious horsepower and voltage, $1.00. Motor Date Service, 3002 Monroe, Kansas City, Missouri. iw) „particulars. MOVIE CAMERAS FOR SALE 16mm BARGAINS, Free 55 page cata- logue, membership to our film library sound, silent. Films $1.00, 100 ft. and up. ogul! Bros., 1944-G Boston Road, N.Y. C PATENTS PATENTS. _ Booklet free. Highest references. Best results, Reasonable fees. Watson E. Coleman, Victor Build- ing, Washington, D. C GET your own patents; legal blanks, complete instructions $1. Cudding Sons, Campbell, Całif. PATENT your idea. Other men have read and profited by our free book, “How to Obtain a Patent.” Fully ex- plains many interesting points to in- ventors and illustrates important mech- anical and electrical principles. With book we also send free “Record of In- vention” form. Prompt service, reason- able fees, deferred payments, thirty-five years experience, Avoid risk of delay. Write immediately to: Victor J. Evans Co., Registered Patent Attorneys, sra Victor Building, Washington, PATENTS—Reasonable terms. Book and advice free. L. F. Randolph, Dept. 341, Washington, D. C INVENTIONS Commercialized. Pat- ented or unpatented. Write Adam Fisher Mfg. Co., 582 Enright, St. Louis, Missouri. PATENT ATTORNEYS INVENT something! New discoveries have cured previous depressions. Un- patented ideas can be sold. I tell how and help you make the sale. Free rite W. T. Greene, 958 atrister Building, Washington, D. C. PATENTS—Small ideas may _ have large commercial possibilities. Write immediately for information on how to “Record of Invention” form. Delays are dangerous in patent matters. Clarence A. O’Brien, 28-Z Adams Building, Washington, D. C PRINTING PRINTING: 1000 letterheads $1.00, 500 envelopes $1.00, 1000 business cards, $1.50. Thayer Printing Service, Gassa- way, W. Va. COMPLETE printing outfits. Type, ink, paper, and suppliės. Write -for catalog, Kelsey Co., D-57, Meriden, onn. PROSPECTING A BOON to the Prospector and miner. Goldak free gold assay kit shows ore value accurately on the spot. No acids or harmful chemicals, triumph of engineering and mathematical ingen- uity. Requires no skill. Price very low. Accuracy guaranteed. Booklet “Suc- cessful Prospecting” worth many times price of kit included free. Write, The Goldak Co., Dept. K, 1031 South Broad- way, Los Angeles, Calif. PROSPECTING AND MINING GOLD prices up. Prospect for health Complete instructions in- cluding actual map of gold-bearing locality, how to get there and what to do. 50c. Laitiner, 362 W. 23rd St., New York City. ‘JUST OUT! (Continued from page 23) PHOTO DEVELOPING FILMS developed 5c per roll; prints 3c each. Ask for Special Bargain List. Roanoke Photo Finishing Company, 159 Bell Avenue, Roanoke, Va. PIGEONS RAISE pigeons for us. We supply stock and buy what you raise. Catalog 10c. John Chico, 127 Farmington Ave., New Britain, Conn. S RABBITS RAISE rabbits for us. stock and bu for stamp. N. Y. We supply what you raise. Catalog tahl, Suite 31, New City, RADIO WHOLESALE Short: Wave catalog, Sets, Supplies, 10c. Federal Radio & Telegraph. Co., 4222 Clifford Road, Cin- cinnati, Ohio. f : . RADIO Engineering, broadcasting, avi- ation and police radio, servicing, marine and Morse telegraphy taught thoroughly. All expenses low. Catalog free. .Dodge’s ‘Institute, King St., Valparaiso, Ind. POCKET RADIO, $2.00. Descriptive literature, 10c. Neil Tasker, Shamokin, Pennsylvania. : REAL ESTATE ne OZARKS—Five acres timbered river fishing, boating, -pearling, shooting—$100, $5.00 monthly. Hub- Bard, 224 Grossman Bldg., Kansas City, ans. ROOTS AND HERBS World’s greatest “Herb Almanac.” Beautifully illustrated in natural colors. Contains over 500 old- fashioned herb medicine recipes and In- dian secrets for home use. 10c (coin) postpaid. Worth dollars! Bontanics, 145 W. 112th St., Chicago. SALESMEN WANTED STRANGE, Chemical wallpaper like magic. cleaning drudgery. Women amazed. Agents cleaning up. Outfit Free. Kristee Mfg., Box 2491, Akron, Ohio. SECRET SERVICE SECRET Service Methods. Particulars free. Excellent opportunity. Experience unnecessary. Write, Wagner, 2640-Y, Broadway, N. Y. ` TRAILERS CATALOGUE of camp trailer plans now available. Enclose 10c to cover mailing cost. Toellen Trailer Service, Box 25, College Park Sta., Detroit, Mich. TREASURE FINDERS COMPLETE plans for building world’s finest treasure finder and rich ore locator. Anyone can build this mar- velous instrument with aid our Blue Prints, Photos, Specifications. Parts all standard; any radio supply dealer, In- vest a few dollars and find a fortune. Write; The Goldak Co., Department M, 2a, South Broadway, Los Angeles, alif. TYPEWRITER SUPPLIES AMAZING discovery renews 12 type- writer ribbons for 10c! No_bother! Complete 50c. (No stamps.) Kiewlak, 229 Virginia Ave., Shenandoah, Pa. VENTRILOQUISTS LEARN Ventriloquism by mail; small cost, 3c stamp brings particulars. Geo. W. Smith, 125 North Jefferson, Room $590, Peoria, TH. 4 Thank You for Mentioning Modern Mechanix and Inventions for February When Writing to Advertisers

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HO ELSE WANTS ELLING O. WEEKS, FAMOUS AVIATOR AND INVENTOR, TELLS YOU HOW TO GET IT Automobile owners who have been worrying about gasoline expense, will be interested in an amazing invention that is now being offered to motorists by this famous Aviator. Already hundreds of thou- sands of cars have been equipped and their own- ers are wildly enthusiastic in their praise. 51 MILES ON A GALLON WINS CONTEST In an amazing test recently conducted by a Texas Motor Company, 23 cars were entered to determine mileage economy. The winning car, owned by Mrs. C. P. Blalock, pictured to the left, Se ran 51 miles on a gallon of gas, and the second Here is Mrs. C, P, Car 49 miles on a gallon of gas. When official carthatransimies test records were published, it was found that ona gallon of gas. both of these cars were equipped with Mr. Weeks’ invention. AMAZING GAS SAVINGS ON BIG CARS Owners of big cars need this new invention just as well as the owners of the smaller cars; the bigger the car the worse the gas eater and the more need of this saving. Emery Shaffer, 3826 N. Ashland Ave., pictured here, the chauf- feur of a well known Chicago business man, says he is delighted with this device. Not only does it save him many gallons of gas every month but Emery Shaffer and Packard Limousine he makes his car perform beautifully. drives. HOW YOU GET 150 GALLONS FOR $4 _ __ _ _ FREE OFFER COUPON _.. J The average automobile is driven probably 10,000 miles a year. Conservatively figuring this new device on 10,000 f ynmrwNo cO., , : miles, it should save you anywhere from 150 gallons of gas I Dept. 977-A, Station C, Milwaukee, Wis. l and up, but figuring at the minimum—150 gallons of gas § Gentlemen: You may send me full particulars of | —this device only costing you $4.00, it is as easy as ABC t your Whirlwind Carbureting device and tell me how 1 to see that $4.00 does buy 150 gallons of gas, besides how I I can get one Free. This does not obligate me in any ‘about the second and third year when gasoline savings way whatever. continue and there is no cost whatever. Make this test. No I l matter what kind of a car you have or how big a gas eater © NAME .......0000ccecsccececceceuececeeveeerseeuane it is, this device must save you money. We guarantee that 4 I if it does not give you more power, faster pick up, less ADDRESS 1 carbon, quicker starting and increased mileage a trial will I ADDRESS revi sete ge ten caer sb one Re E eena B I I cost you nothing. We invite you to test it at our risk— you are to be the sole judge. Mail free offer coupon today. ELLING O. WEEKS, Pres. ’ R P r The Whirlwind Co. , , $ E eee bae ii Pea interested in full or part J Dept. 977-A Station C Milwaukee, Wiss |... ee ee ew ee eee eee el cht iige. Thank You for Mentioning Modern Mechanix and I nventions for February When Writing to Advertisers 25

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OME of the world’s most suc- cessful inventions came from men who didn’t consider them- selves inventors at all. The tele- graph was invented by a painter ; the typewriter by a farmer; a poet fig- ured out the sewing machine; a school teacher the telephone; a bank clerk the hand camera and a dentist the stock ticker. Or look at small inventions: A husband noticed his wife bending a hair pin to make it stay in her hair. That gave him the idea of the crinkly hair pin, which he proceeded to patent. One day a golfer got the idea—just a hunch —to make a wooden tee. He patented his idea—and every golfer knows that wooden tees are sold by the millions every year. These are but a few of many similar examples in inventive history. That is why we say that the book shown on the next page is for INVENTORS and Other Men with IDEAS. Some men make a business of invention. They make their living—even fortunes—that way. Other men who are not inventors at all occasionally have good, practical ideas which could be patented to their profit and with benefit to the world. Whether you consider yourself an in- ventor or not—if you have a good idea; an idea that will save money, save time, save labor, make money or give pleas- ure—you should at least find out how you can protect your rights to it. And this interesting, new FREE book, PROFIT PROTECTION, z will tell you. us Little Ideas May Every year thousands of patented new ar- ticles are brought on the market—the result of someone’s happy thought. Often it is these little, slmple ideas—the kind you find on the m H: Read What C. F. KETTERING Vice-Pres., General Motors says about Invention Sometimes we hear people say: “Well, there isn’t must left to invent.” But Charles F. Kettering, Vice President and Head of Research of General Mo- tors, who helped develop the self-starter, Duco, and many other outstanding in- ventions, doesn’t: think that at all, He thinks just the opposite. In an inter- view, recently published in Good House- keeping Magazine, Mr. Kettering said: “If we took half the men employed in tool making and put them to work- ing out new inventions, new things, we could snap out of this depression in no time. Our return to normal times de- pends on new manufactured products that will catch the purchaser’s eye, get him to buy and thus start the ball roll- ing. Change and buying go together. Were only entering the great period of inventive advancement.” Have Big counters of a 10c store like the one shown here —that are among the most successful financially. Whether your idea is simple or complex—tlarge or small—if it 1s new and useful, you owe it ENTORS 7 AND OTHER MEN WITH IDEAS Our Business Is to Help Inventors For thirty-five years, this organiza- tion has been in the business of helping inventors. During that time ideas—in- ventions—from literally every corner of the country have been turned over to us to protect. Some of these ideas have represented large and complicated mechanisms; many others have been very small, practical articles, like a can opener or a new toy. All this has given us a wealth of experlence which we place at the use of the inventor of today. What you write us is held in strictest confidence. Here in Washington, near the U. S. Patent Office, we maintain a large staff of experienced Patent Spectallsts, Draftsmen and Specification Writers to give you prompt and competent service. Yet because we know how to work efficlently—our fees are low; and if desired we are in position to help you - with a plan of deferred payments. Delays Are Dangerous— Write Us Today In inventive matters, delays can often prove very serious. It frequently happens that two or more inventors will be working on. substantially the same idea without each other’s knowledge. And the Patent Office rules tend to favor the man who gets his Patent Application on file first. So if you have an idea—YOUR VERY FIRST STEP is to find out exactly what te do to protect yourself. That is a step you can take today—right away in fact—by sending for your copy of PROFIT PROTECTION. Commercial Possibilities to yourself to find out how you can protect it. Send for a FREE copy of the book, ‘Profit Protection’ NOW. VICTOR J. EVANS £ CO. sot mpre 26 Thank You jor Mentioning Modern Mechanix and Inventions jor February When Writing to Advertisers

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How the Patent Laws protect you and why, if you have a good idea, Fon need a Patent at all. What to do to make application for a Pat- ent; just what informa- tion a Patent Attorney needs to help you. What kind of a sketch or model is needed, What simple steps you may be able to take right away to help establish your right to your idea, even before you make application for a Patent. How some successful inventors have secured financial assistance to help them in the de- velopment of their ideas. Se VICTOR J. EVANS & CO., MAIN OFFICE: 605-B, VICTOR BUILDING, This Book TELLS YOU: Tells you about in- teresting inventions that have proved successful and illustrates impor- tant mechanical princi- ples that inventors fre- quently use in working out problems. PROFIT PROTEC. TION is much more than a book about pat- ent procedure. In it we have put the kind of in- formation that we know from long experience the average man with an idea would like to have. The very same day we hear from _you——a free copy of PROFIT PROTE ION will be placed in the mail to you. Sign and send the coupon. Get that much done today. Tonight Have this Coupon in IMPORTANT | With this interesting book, you will alsofinda ‘Record of Invention’’ form, which makes lt easy for you to sketch and describe your idea asa matter of record. This is an impor- tant step if you haven't taken it already. The book will tell you how to use this record'and why. It also comes to you wilh- out any charge or obligation. the _ MAIL to WASHINGTON a WASHINGTON, D. C. I am interested in your book, PROFIT PROTECTION and your Record of Invention form. Please send both of them FREE and without obligation on my part. Street and No.. City or Town AA H Other Offices: 1640-B, Conway Building, Chicago; 1007-B, Woolworth Building, New York; 828-B, Fidelity Philadelphia Trust Building, Philadelphia; 514-B, Empire Building, Pirts- burgh; 1010-B, Hobart Building, San Francisco. (Be Sure to Write or Print Name Carefully) 605 B-VICTOR BLDG. WASH. D.C. seci Thank You for Mentioning Modern Mechanix and Inventions for February When Writing to Advertisers moe 27

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Back of the Scenes with Some of the Highlights Eddie Cantor Read the inside story of how the Chase & Sanborn hour, fea- turing Eddie Cantor and Rubinoff, isbuilt. The inimitable Eddie lifts the curtain on this popular feature. Eddie Cantor Here is your pass into the broad- casting studios where you can see your favorite radio stars at work behind the microphone—brought to you through the pages cf RADIOLAND The New Magazine of the Air Ed Wynn gives his formula for success-in the Febru; ary Radioland—and affords you an inti- mate view into his past life and his up- roarious Fire Chief program. Sparkling stories of kilocycle fa- vorites, gossip from the studios, beautiful portraits, cartoons, fic- tion, household departments, current radio news—all these features appear in each issue of RADIOLAND, on sale the first of every month. of the February Issue: Behind the Scenes with Father Coughlin That Amazing “Voice of Experience” An intimate story of one of radio’s most Pages out of real life, sheer melodrama and amazing personalities, whose vigorous talks stark tragedy, picked from the records of and fearless methods have made him nation- that astonishing radio personality known as ally famous. the Voice of Experience. Rudy Vallee Answers Your Intimate Why Women Don’t Click on the Air Questions A famous psycho-analyst explains why women A new feature of RADIOLAND which per- don t register so effectively as men over the mits you to ask whatever questions you choose radio. of your favorite star. The Romantic Life Story of Bing Crosby Ida Bailey Allen’s Homemaking The marriage and amazing Department leap to fame of a radio and movie favorite. Backtracking With the Boswells The famous sister trio knew what it meant to go hungry before they won fame with their songs. The famous cooking ex- pert, known to millions of women through her radio talks and books, conducts this popular department. Scores of other personali- ty stories, photographs, editorial comment, fea- tures. Get your copy now! At All News Stands -cht 28 ngpa: Thank You for Mentioning Modern Mechanix and I nventions for February When Writing to Advertisers

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Put This ATLAS 9” LATHE in Your WORKSHOP—Tool-Room Accuracy, Works Metal.or Wood. $79 Cash; or Easy Terms, 10 months to pay. This same lathe is in service in hundreds of machine shops, garages, factories. A real machine tool, quality built. Tested for 1/1000” accuracy before shipped. Sold to you with guarantee of satisfaction or money back. Try it and see for yourself what tremendous value you get for your money, what exact, beautiful work the ATLAS does. Uses 14 h. p. Motor—Econemical to Run All modern; self-contained countershaft, no ‘outside shafting and pulleys neces- sary ; patented V-belt drive; 45 parts of. Zamak alloy, twice as strong as cast iron, 6 speeds ; 18” between. ceñ- ters. Plugs into light socket. Serew cutting, 4 to 72 threads per inch. Compound rest, automatic, reversible feeds, hollow spindle. Try it 2 weeks, money back if not satisfied. A few dollars a month buys it. Tools and attachments at very low prices, also. Write for free catalog giving all details, to ATLAS PRESS CO. 1652 N. Pitcher St. Kalamazoo, Mich. $79 complete as shown, less motor. $89 with motor, ready to run. BE A’ COMMERCIAL. ARTIST O Learn-quick! . SEND’ FOR yi Photo retouching; fashions; Se ndyertishg Wont, commervial,..cutomptive, & and merchandise itlostratlon; earton wid label" : designing: låyont and‘ design for dite, folders and: rect mail advertising. Get our ACADEMY wr ADVERTISING: ART Founded Ji 2013 W. Grand Blvd, Detrolt, Mich. AT HOME You can learn by our modern and original system of instruction every: part of the Watch Repairing j Trade at home as good or belter thanata shop. Yow can earn money while learning and secure | 2 well paying position or start in business after completing our course of instruction. Good watch repairers are always in demand and’ earn from $50 to $75 perweek.. For particulars apply to the u SCHOOL OF WATCH REPAIRI s24 e MACON Ste Bente ook o s ARNS, wis. Q TOBACCO No man or woman can escape the harmful effects of tobacco. Don’t try to banish: un- alded the hold tobacco has upon you. Join the thousands of inveterate tobacco users that have found it easy to quit with the | aid of the Keeley Treatment. Treatment For | |. Tobacco Habit | | 2 Successful For Over 50 Years. Quickly banishes all craving for tobacco. Write today for Free Book telling how to quickly Free yourself from the tobacco habit ond our Money Back Guarantee. KEELEY INSTITUTE, Dept. D-759 Dwight, Hlinols Home of the famous Keeley Treatment for Liquor and Drugs. Booklet sent on request. Correspondence strictly confidential. paid on the first and fifteenth of each month $1260 to $3400 a Year PICK YOUR FUTURE JOB MEN, BOYS—18 to 50 Travel-See Your Country Railway Postal Clerks get $1,900 the first year, peing each pay day.) Their pay is quickly increased in normal years, the maximum being $2,700 a year. ($112.50 each pay day.) Railway Postal Clerks 3 Daye On—3 Days Off—Full Pay Railway Postal Clerks on long runs usually work 3 days and have $ days off duty or in the same pro- During this off duty their pay continues They travel on ortion. ust as though they were working. - @ pass when on business. When they grow old, they are retired with a pension. City Mail Carriers, Post Office Cierks : Clerks and Carriers now commence at $1,700 a ` year and in normal years automatically increase $100 a year to $2 100° and $2,300. Customs and Immigrant nepector Salary $2,100 to $3,300. Men 21 to 45. Work connected with examining immigrants and merchandise entering the coun- try from foreign parts. You Can Get Them Experience is usually un- necessary and political influ- ence is not permitted. Let us show you how. Get Free List of Positions Fill out the following coupon. Tear it off and mail it today—-now, at once. This investment for a postage stamp may result in your getting a government job. FRANKLIN INSTITUTE, Dept. T-303, Rochester, N. Y. Rush to me entirely free of charge (1) a full description of the position checked below; (2) Free Copy of 32-page book, “How to Get a U. S Government Job”; (3) A list of U. S. Government Jobs; (4) Tell me how to get a Government Job. E): Rallway Postal Clerk . E Post Office Clerk . O City Mall Carrier O Rural Mail Carrler ($1,260-$2,500) O Inspector of Customs ....... ($2, 100-$3,300) O Immigrant Inspector ......ccccceeesccceees s.a. - e ($2,100-$3,000) . « ($1,900-$2,700) ($1,700-$2,300) ($1,700-$2,100) ($2,100- 3,000) Use This Coupon Before You Mislay tt Thank You jor Mentioning Modern Mechanix and Inventions jor February When Writing to Advertisers 29

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“President As a boy President Roosevelt wanted to be a sailor, but his father sent him to Harvard. He enjoys sailing cruises with his sons. Here is an intimate pose of the President eat- ing food cooked by himself on one of his vacation cruises. ROO EVELT When storms toss the Ship of State, the President finds diver- sion with his great col- lections. Modern Me- chanix sent James N. Miller to the White House for this story of the nation’s great hobbyist. Sailing is the President’s favorite sport and his love for the sea is represented in all his hobbies. Above i isa photo of the “Amberjack II”, 45-foot sea-going schooner, im which he took a leisurely vacation cruise after his election. by JAMES NEVIN MILLER SECRET service agent rapped on the door of the home of a retired minister in a suburb of Washington. The clergyman opened the door. The - government agent flashed his badge. Tim- idly, perhaps ‘apprehensively, the minister asked the man to step into the living room. Imagine his astonishment when the agent announced: “Your Reverence, the President would like to have you drop in some day at the White House. He’d like to see you about your stamp collection. He says that you should bring it along so that he can take a. look at it.” The clergyman, noted for his stamp col- lection, relaxed and excitedly replied that he would be delighted to come “whenever -convenient for Mr. Roosevelt.” THE FIRST COMPLETE STORY OF THE NOTED 30 -Modern Mechanix and

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“White “House HOBBIES When the day’s work is done at his desk in the White House, the President often turns to his stamp collection. He is a philatelic fan with 20,000 stamps in 30 volumes. This anecdote is just a sidelight in the life of the nation’s chief executive, but it adds to an understanding of the character of the President of the United States. To understand great men thoroughly one should know their avocations, their hob- bies, the diversions that occupy them in their leisure time. The Prince of Wales, in addition to golf- ing, horseback riding, and dancing, knits and crochets. He claims that knitting rests him when he is tired. Henry Ford is fond of collecting old buildings, furniture, and vehicles. Andrew Mellon is known as a collector of paintings and rare books. Sits in Bed Pasting Stamps President Roosevelt might be cailed the nation’s leading hobbyist. When the troubles of the country bear heavily upon \him, the chief executive is able to forget his worries among his great collections. Sometimes far into the night he will sit in bed pasting stamps in albums. Stamp collecting is only one of his hob- bies. Love for the sea seems to dominate ‘all his pastimes. His collection of naval books, engravings, paintings, pamphlets Exclusive Modern Mechanix Photo The “Raleigh,” early American war vessel, is one of the prized models in the President’s collection. The models ate part of a greater collection that is a realistic history of the heroic and stirring events of the United States Navy. and ship models is considered the finest in existence in private hands. Except for official reports and docu- ments, it is possibly superior to that in-the Congressional Library. It consists of -be- tween 6,000 to 7,000 books, approximately 10,000 pamphlets, 450 framed lithographs and etchings and more than 60 paintings. COLLECTIONS OF OUR CHIEF EXECUTIVE Inventions for February 3l

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Numerous Famous Naval Historical Paintings Grace White House Walls Exclusive Modern Mechanix Photo This model of the whaling ship, “Josephine,” of New Bedford, is built true to scale and is complete in all details. It is one of the prized models of the President. When the President goes to sea in a sail boat, he hand!:s the helm him- self. He returns happy, tanned, and rested as shown above. At left is a glass case in Mr. Roosevelt’s study containing eight mocels. Top row, left to right are, model of a whale; “La Provence,” French liner; sword- fish model. Middle——The “Malcolm L. Cropley,” early American brig; and the S. S. “Olympic.” Bottom— The Pilgrim Mayflower; the S. S. “Mauretania,” another Mayflower model. The President himself has supervised the designing and build- ing of many of his models. He has built miniatures of every home in which he has lived. | Exclusive Modern Mechanix Photo His stamp collection consists of 20,000 stamps and 30 volumes, one of the largest in the country. While governor of New York, Mr. Roose- velt kept his favorite Navy collection in his Hyde Park, N. Y., and New York City homes. His study, the library, even the halls and part of the staircases were almost covered with some of the finest known paintings of American ships. i At his Hyde Park estate he kept most of his favorite ship models. All of these mod- els were made by hand and in most cases each is a perfect reproduction of an original ship. These wonderful miniatures are worth thousands of dollars. Together with the paintings and litho- graphs these models give a graphic and 32 vivid history of exciting and heroic deeds of the American navy. Upon becoming President, Mr. Roose- velt sent for only the best models and paintings. Yet there was a sufficient num- ber to decorate three rooms of the White House: the President’s bedroom, study, and office. None but Mr. Roosevelt’s most intimate friends are permitted to visit the bedroom. The study on rare occasions may he seen by authorized persons. The writer was given permission to visit the White House, and take along a photographer to view and photograph the President’s hobbies. Incidentally, before describing these col- lections, it would be best to reveal another interesting angle concerning the President Modern Mechanix and

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President Roosevelt Designs and Builds Many of His Own Prized Models Above is a glimpse of the study on the second floor of the White House where the President often confers with foreign’ en- voys. It is furnished with the most prized’ models and naval paintings of Mr. Roose- velt’s collection. Modern Mechanix and Inventions’ correspondent gives a descrip- tion of the room in the accompanying article. At right is one of the models. Te is a full’ rigged frigate, war vessel! of the Revolutionary war. Hand-made in every W Particular, the model is worth thousands of dollars. and his avocations. The President’s mother revealed that, not only does he collect mod- els, but that he also enjoys supervising the designing and building of models of both ships and houses. a Every house in which Mr. Roosevelt has lived has been reproduced, under his super- vision, in a miniature model. The Presi- dent himself, his friends say, has built many models of houses. Painting Saved “Old Ironsides” Shortly after his election as governor of New York, he personally constructed an ingenious little model of the governor’s mansion in Albany. He has also ingeniously built tiny models of cottages at the Warm Springs, Ga., sanitarium. Returning to the White House—just back of the President’s desk im his study is a remarkable group of paintings of early American ships, mostly men o’war. One is the famous original painting of the Con- stitution, by the noted American artist, Gordon Grant. This is the painting that saved Old Iron- sides, noted for her distinguished victories in the Revolutionary War and the War of 1812, from becoming a loss as a treasured Inventions for February historical ship. In 1925, it will be recalled, Congress authorized restoration of the Con- stitution, but appropriated no funds for the purpose, To save the old ship it was decided to raise the money by private contributions through the sale of copies of the painting in Mr. Roosevelt’s possession. Approxi- mately 4,500,000 school children contribut- ed. In all $725,000 was raised and now the Constitution, completely restored, is paying her respects to cities on the Pacific coast. Another famous painting in this group shows the loss of the Kearsarge, well known Union man o’war of the Civil War. She was one of the earliest of Uncle Sam’s steam war-sloops. The Kearsarge earned her place in American history by her vic- torious battle with the Confederate steamer, Alabama, off Cherbourg, France. The White House painting shows the famous ship some years later, sinking after being wrecked on Roncador Reef, in the Gulf of Mexico. (Continued on page 121) 33

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Queer Wing-Flapping Plane Ascends Vertically Into Air 7 Seaplane, autogyro, helicopter—whatever it is called, this strange craft can rise straight up in the air, fly in level flight like an ordinary plane, and take off or land on water. A QUEER-SHAPED aircraft, seemingly a combination of everything which has ever flown through the air, has proven suc cessful in initial tests, doing just about anything in the way of performance that could be asked of a heavier-than-air craft. ‘Jette, designer, a young Swedish engineer of Stockholm, believes his radically-de- signed plane will revolutionize the aviation industry. Stubby wings like those of the earlier _autogyros give the plane stability in hori- zontal flight. The engine drives a propeller mounted forward as in the ordinary land plane, and through gears turns the huge overhead rotor. Three flapping wings at- tached to the rotor move up and down as they spin, just as in an autogyro, and vanes po the inside of the rotor provide lifting orce. Baby Crib Carried in Auto OND mamas have a great convenience in a new crib which can be folded up and transported anywhere. Portable erib can be set up in yard to amuse youngsters. 34 Right; Artist’s sketch of take-off as seaplane on water. _ Air Jacket Saves Aviators’ Lives British aviators use this life-saving jacket which can be blown up in a few seconds, when forced to land on water. RITISH Air Force members who fly over #2 water no longer need fear forced land- ings. Life saving waistcoats supplied to them are made up of two layers of waterproof material, and can be completely inflated in a few seconds. A rubber hose leading from the air-tight jacket has a nozzle and valve at the end for casy inflation by the aviator. The jacket in no way interferes with the use of the arms. Modern Mechanix and

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SETTLE Pierces “Night Beyond the Earth” Starting from Akron, O., the Settle balloon reached the altitude record over McCon- nellsburg, Pa., and landed in a swamp at Bridgeton, N. J. Commander Settle is shown being towed in a duck boat by a’state trooper after his balloon landed in a New Jersey swamp, The balloon just missed landing in Delaware Bay. : Inventions for February Settle (right) and Fordney are shown hold. ing the barograph which recorded the record height of eleven and one-half miles. Here is Lieut. Commander Settle inside the tiny gondola of their stratosphere balloon. He is adjusting a quartz spec- tregraph which recorded the intensity of ultra violet rays ‘in the stratosphere. AN’S last frontier, that mysterious re- gion beyond the air, has again been ex- plored. The balloon flight into the strato- sphere of Lieut. Commander T. G. W. Settle and Major C. L. Fordney gave the United States the altitude record of 61,237 feet, more than 114% miles. From that great height the balloonists talked to the earth by short wave. Great topographical features were visible, but they were not high enough to see the curva- ture of the earth. Settle had time to only glimpse the stratosphere, which he called “night beyond the earth.” Both men were busy with scientific in- struments for studying cosmic rays and ultra violet rays. Bread mold spores were tied outside and were found unaffected by the rare, cold air. 35

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Seth Parker’s Sunday Meeting Over the seven seas Seth Parker is seeking monsters of the deep, buried treasure and wild beasts. Here is the story of his world cruise in a windjammer, a boy’s dream come true. by ALFRED ALBELLI O-HO, me lads, yo-hoe, by gosh! Here we be a-tryin’ to take a chaw agin’ the wind on the sleek schooner “Seth Parker” on a latitude “somewhere” en route around the world, with the famous radio star as the skipper and a rip-snortin’, puddin’-headed, home-spun crew to do the chores. Seth Parker, as ye all know, is neighbor Seth from old Jonesport, Maine, who used to have the Sunday night socials where the folks got together singing hymns and hav- ing a grand gab fest. The NBC radio station in great big New York eaves-dropped in on these meetings and city dandies got to snickering over goings-on in Jonesport. But Ma and Seth Parker, a cheerful, homey couple, put Jonesport on the map and did as much for their home state as Rudy Vallee and his stein song; by cracky! Offers to Take School Chums Back in ithe days when Seth Parker, whose name is Phillips Lord in real life, was in high school, he promised a few of his chums that if he ever became wealthy he would take them all on a cruise around Seth Parker has loaded his ship with ammunition to bag jungle animals. This four-masted schooner, “Seth Parker” is taking the noted radio. star around the world on a cruise of adventure. The interior of this windjammer has been refurnished entirely with modern conveniences to satisfy the ship’s crew. 36 Modern Mechanix and

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Sails for ‘World “Adventure. the world in a real sailing schooner of bygone days. Fame and money have come to Seth Parker through his homey Sunday night Yankee broadcasts. Phillips Lord is keep- ing his promise. After much searching, he found a fine old four masted schooner. He bought the ship and named it Seth Parker. Then he set out to get a crew who knew the difference between fore topgallant braces and flying jib booms, spanker sheets and main sheets; men who knew their sails and riggings. Old salts who had sailed before the mast of windjammers were hard to find, but at last Seth Parker rounded up enough to man his schooner, only to find that rough going was still in the offing. The men could handle the ship, but they did not want the forecastle bunks, the mess table, and the salt pork of the old days. Crew Wants Modern Luxuries They wanted modern conveniences. Be- fore he could set sail Seth Parker had to install an electric lighting system, electric refrigerator, air conditioning, and other up- to-date luxuries that appeared out of place in the old schooner. The crew was satisfied and Phillips Lord notified his old pals he was ready to keep his promise. Here another hitch came into his plans. The friends notified him that their wives would not permit them to go. Without his pals Seth Parker put out from Portland, Me., in his remodeled wind- (Continued on page 134) “Ma” and Seth Parker in charac- ter will enact their Sunday Yankee socials during the world cruise. Seth Parker’s real name is Phillips Lord. The old fashioned New England parlor that forms the background for Seth Parker’s famous hymn and gossip socials. The entire cast has been taken on the world cruise to continue the weekly broadcasts by short wave from the ship. Inventions for February 37

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Automatic Camera Snaps ‘Raiding Bandits J. Frankenberg (seated) watches Eugene Cole press the switch which starts the new bandit identification camera. Laundry Can’t Be Lost in New Case TUDENTS who mail their laundry home each week can be sure that it will ar- rive safely, thanks to a new locking spring which prevents address cards from slip- ping out of the pocket on top of the mail- ing case. The patented feature permits the inser- tion or removal of the address card by sim- ply raising a locking spring. The metal card holder is riveted to the lid of the box. New cards can be used each time the carrier is mailed, eliminating the necessity of scraping off old labels and stamps. A: simple locking spring holds. address card containing stamps in the metal frame riveted to the cover of the laundry mailing case. Card is removed by raising spring. 38 The new automatic camera on shelf at left silently takes pictures of bandits’ at work, when set in operation by hidden switch in cashiers’ cages of bankg or stores. Az and powerful tool against bank bandits is a recently developed auto- matic camera which takes pictures of gangsters while they are holding up banks or stores. Even though the bandits may be masked, the camera will catch peculiarities in the movements of the men, little identifi- cation marks on their hands, and every de- tail of their clothes. The new camera can be set on an out- of-the-way shelf some distance from the cashier, or concealed in the walls, and focused to record movements near the cage. Remote control switches at every desk in the bank need only to be touched or brushed against to set the camera in operation. Glass Jar Caps Defy Housewives | Fi try to screw off a bottle top that refused to be unscrewed? Perhaps it really was unscrewable, as were so many of the jars tested by the Pittsburgh Testing Laboratories. Ten different unopened bottles and jars of grocery goods were brought into each of fifty kitchens to be opened. Each housewife was told to open the jars any way she liked, this meaning everything from banging the bottles on the floor to calling hubby. Of the 500 jars, 96 could not be un- screwed with the hands, and 40 of these defied all efforts of the housewives. Manufacturers are studying results of this test, in order to find a cap which can be opened by even the weakest-armed. woman. Modern Mechanix and

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Banner Crop of Cactus Fruit Made Into Candy and Jelly HE largest cactus fruit crop in the his- tory of Southern California was obtained by ranchers of this arid region this season. Ranchers who once despised and grubbed out the thorny plants are now turning to them for a living. The thorny fruit is preserved for sauces, is pickled, made into excellent jelly, and even used for tasty candies. The fruit is declared delicious by those who eat it raw. The variety of cactus now being culti- vated is a result of the researches of Luther Burbank, noted plant experimenter. He selected specimens of the ordinary desert cactus, and kept replanting specimens which showed smaller thorns and larger, tastier fruit, until a satisfactory fruit was obtained. Old Phone Holds Unusual Record Mrs, Z. E. Robertson operates the furthest west telephone exchange in America, an old fashioned switchboard sta- tioned in the general store of the town of Bay, California. HE tiny town of Bay, California, holds the distinction of having the furthest west telephone exchange in America. The old-fashioned switchboard is stationed in the general store, and tended by the store- keeper, Mrs. Z. E. Robertson. Eastport, Maine, brags of being furthest east. The town fathers of Bay are going to change the name of their hamlet to West- port, and take their place in the hall of fame. The longest straight telephone call in the country is from Eastport, Maine, to Bay. Only one such call has ever been recorded. Inventions for February Miss Sidney Carroll picks cactus fruit from a heavily bearing patch near Pasadena, Calif. She says the raw fruit is delicious, and makes fine candies, sauces and jelly. “Normandie” Has Largest Motors HE largest electric motors in the world, four 40,000 horse power electrical giants, will be installed in the new French liner, Normandie, a ship which when built will be the largest vessel in the world. They will drive the ship at 30 knots per hour. The largest motors in any American ves- sel are those installed in the airplane car- riers, U.S.S. Saratoga and U.S.S. Lexington, and are rated at about 22,000 horsepower. These motors form a vivid contrast to the tiniest motor, used in delicate electrical me- ters, which is rated at .00000033 h.p. + Largest and smallest in electric motors—the gigantic 40,000 horsepower motors being installed on the French liner, “Normandie,” and the tiny unit used in electric meters, 39

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“Tin Plate” Cruiser Loses Skirmish With Tramp Steamer Veering to avoid one ship looming in the fog, the U.S.S, Chicago was rammed by a second ship, the Silverpalm. HE 10,000-ton cruiser U.S.S. Chicago was steam- ing toward’ San Francisco, outbound*from San Pedro to join the Navy Day celebration. A dénse fog enveloped her off Point Sur, 110 miles south of her - destination. A large ship suddenly appeared across the Chicago’s bows, miraculously passing without colliding as the Chicago’s engines were backed. Hardly; had:the Chicago gotten under way when the British 6,000-ton freighter, Silverpalm, came plowing down on her out of the fog. Both ships tried to. stop to no avail. Result: 3 men: crushed to death on Chicago; 18-foot hole ripped: in light plating of cruiser, bow of tramp rolled up few feet. OAKLAND 1 (Pree, NS SAN: N RANCISO\ The bow of the British’ freighter, Silverpalm, after the collision. Be- cause the shock was absorbed end on, damage is not unusually heavy. SCENE OF COLLISION Three men met death as this hole was ripped open. a The hole ripped open by the freighter, Silverpalm, is shown quite clearly. as the Chicago is brought into drydock preparatory to repairs. The hole is just forward of the gun turret, di the stout plating: of ‘which caused the Silverpalm to bring up sharply, preventing further lisaster. Two officers and a pay clerk were crushed’ to death. The Chicago is one of a class of ten -cruisers built to carry 8-inch guns, which. some time ago gave trouble because five of them had. to have alterations made to the stérnposts. The accident revived: talk- of “tin. plate” warships in Navy circles. ` Adimiral Taussig, however, pointed out that not even battleships are armored at-the point where the Chicago ‘was. struck, that the accident proved nothing. 40 Modern Mechanix and

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Ghe eACAGIC Palace of RADIO CITY A ‘AAR BA A: E B ATO A BBE This auditorium is 72 feet wide, 132 feet long and is nearly 60 feet high. It is the largest studio in the world. The stage is not only reversible from end to end of the studio, but can be adjusted to accommodate exactly the right number of artists. Walls were covered with fabrics specially woven for the service. The central tower, or RCA building, is 70 stories high, rising 836 feet above the street. The view shown is taken from the garden on the roof of one of the skyscrapers adjoining the group. Center shows a maze of wires, the hooking of which was a major feat in itself. Right shows air control boards which supply changed air to the studio floors, which have no windows. UST a few weeks ago in a building cover- ing three New York City blocks from Forty Eighth to Fifty First street, tycoons of the electrical, radio, motion picture, entertainment and art world sat down in company with 1200 select guests to dedicate the completion of the Rockefeller financed monument to the 13 year old industry of broadcasting—Radio City. Built to accommodate and anticipate rapidly outgrown and outgrowing needs of the broadcasting industry, this modern en- gineering wonder tops all superlatives. The industry it represents has grown the fastest toward national import, in the shortest space of any industry of our time. The first national broadcast occurred but 13 years ago when. Dr. Frank Conrad, of the Inventions for February Westinghouse Electric and Manufacturing Company put on the air the events of the Harding election from station KDKA, set up informally in his garage in Pittsburgh. The building is our biggest, has the most “mosts.” ; : So gigantic has the radio broadcasting industry become that the need for housing the nationally important broadcasting com- panies, with their attendant production and executive offices, has called for the building of this skyscraper group in the heart of midtown Manhattan. Over 22,000 people is the potential tenancy of the “City.” As they go about their daily work in connection with the business of broad- casting—these people equal the population (Continued on page 133) Al

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The monorail car above kas.just been de- veloped in England‘ to provide fast trans- portation as a substitute for street car sys- tems. Driven by. propellers fore and aft this monorail developed'a speed of 100 miles an hour in: a demonstration near Glasgow. Guide rail pre- vents side sway. yroscope e¥onorail (ar to This German monorail will revolu- tionize rail transportation. At 300 miles per hour it will meet the chal- lenge of the air transport lines. || esha ers may challenge the increased popularity of air travel by developing a superspeed monorail car. Balanced by gyroscope and eontrolled by radio, the gyroscope monorail would be capable of more than 300 miles an hour, its inventor claims. The gyroscope, not a modern invention, has only recently been applied to transpor- tation. It steadies ships in storm tossed seas. It aids in the automatic control of airplanes in. flight. Applied to rail transportation, the gyro- scope will permit much greater speed with- out sacrificing safety. In fact, Raymond C. Buchardt, engineer of the Telefunken com- pany, of Germany, who designed the gyro- scope monorail, claims his superspeed car provides greater safety than is now possible. Car Stands Upright on Monorail Buchardt’s monorail has all the latest de- velopments in streamlining and makes use of. airplane features to guide the car on its single rail. The gyroscope monorail stands upright on its single rail, while present monorails are suspended from the rail. The gyroscopes are used to balance the 42 Engineer Buchardt’s improvement over the English mono- Tail. is shown above. For street transport systems large steel structures would be unnecessary. Gyroscopes would. elimi- nate a guide rail to stop side sway. Greater speed is possible. car on this single rail. They do away with the side sway that would be present were great speeds attempted with the suspended monorail. Radio Will Replace Bleck Signals “Because of the terrific speed of more than 300 miles an hour, the ordinary block signal will be impossible for the trans-con- tinental monorail,” said Mr. Buchardt. “Signals would not be visible and in fog, rain or smoke the vision of the pilot would be entirely obscured. “To meet this difficulty I propose to use the radio to transmit signals and orders to the pilot just as transport planes are now controlled. Radio messages from a dis- patcher’s office would tell the pilot when to slow up and would warn him of any dangers ahead.” The. enormous air pressure created by the great speed would throw an ordinary ear from the rai]. Buchardt has solved this problem by designing a long, sloping curve Modern Mechanix and

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‘Gravel 300 PILOT'S CABIN RADIO antenna jE omino AND OBSERVATION 2 ROOM Above is a cross section of the cross country high speed gyroscope monorail designed’ by Buchardt. iles an SHour DRIVING PROPELLER a) The 300-mile-an-hour gyroscope monorail is shown in-the artist’s drawing above. The long forward sloping planes hold. the car to the rail. Radio signals would guide pilot. on either side of the car, which he calls a “wind catcher.” The air pressing against this “wind catcher” would hold the car on the. rail. In his experiments with his invention, Buchardt found that the monorail would have trouble taking curves. The car took the curve perfectly, but the centrifugal force nearly threw it off the rail after com- pleting the curve. For that reason stabilizing fins were placed at the front and rear. of the car along with a large rudder. The forward fin also houses the radio antenna. The-gyroscope car is driven by two large propellers at either side of the rear end of the car. One gyroscope would be housed in Inventions for February This latest railroad car design follows the streamlining used on the gyroscope monorail, This English rail car attained a maximum speed of 60 miles per hour. the forward end of the car and the other in a rear compartment. Power would be sup- plied by Diesel engines. The rail used would be round and the wheels curved in such a way as to form a ball link. The traction system type of monorail would be much smaller than the car used in cross country runs. The latter would be a double-decked car with the pilot housed in a third deck forward. ; The trans-continental type would carry approximately 100 passengers. A3

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Sea Scouts Receive Training in This Novel Backyard Ship — ScuUTER | yecurmnnnont ‘Sea Scouts of an English school have constructed this 58- foot training ship, complete with powerful wireless equip- ment, on their school lawn for use as troop headquarters. Tanks, Guns Used in ‘Battle’ Game TA soldiers of childhood have grown up and, supplemented by miniature tanks, guns, and airplanes, are making the exact tactical maneuvers of actual warfare in “Battle,” a new war game recently intro- duced in Hollywood by Dale Van Every, noted war author. The game includes surprise attacks, frontal charges, cavalry raids, artillery barrages, air bombing, and all other maneuvers of modern warfare. The play- ing board is divided into two halves, so that opposing “generals” can prepare their forces for battle out of sight of each other. In the new “Battle” game, opposing “generals” line up their forces secretly and move miniature tanks, planes, guns, and soldiers just as in tactical maneuvers of modern war. 44 COMPLETELY rigged 58 foot ship, berthed on the lawn at the back of an English school, is headquarters and train- ing ship -for the Rose Hill Sea Scouts of Tunbridge, Wells. The headmaster of the school, R. Saun- ders-Johnson, is Scoutmaster and designer of the ship. The group of Sea Scouts started construction in 1927, making the ship exactly like an ocean-going vessel. It has masts, rigging, life-buoys, ship’s com- pass, and a powerful wireless transmitter. Additions are still being made to the equipment, and improvements worked out for the wireless apparatus. Scouts follow the strict routine of sea life when on the land-ship, even to. the extent of scrubbing down the decks and polishing the brass work. They receive a nautical training which, because of its safety, is finding great favor with parents. New Guard Keeps Rats Off Ships Metal rat guard slides easily over hawsers, preventing the rats from bringing contagious diseases to ships, Rats attempting to climb over guard slip and plunge into water. AC rat guard which can be placed in position on hawsers without leaving the deck of the ship has been developed by W. A. Meade of Los Angeles, and is now being used by more than 40 ship lines. Keeping rats off of ships is the best known means of preventing the carrying of plagues from one country to another, and of eliminating contagious diseases among the ships’ crews. Modern Mechanix and

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New Rail Car Runs on Air-Electric Perpetual Drive 25 ton air electric rail engine ready. for tests. Bat- tery drives electric motor running, starting air com- Pressors to get 400 Ib. pressure in air tanks; air engine drives car; wheels drive main compressor to refill tanks, and battery charging generator. FE™ coast to coast by rail in 24 hours, traveling literally on air—that is: what W. E. Boyette of Atlanta, Georgia, claims for. his invention, a railroad engine that runs almost entirely on air. Air for fuel—speeds of up to 125 miles an hour on rails—low transportation costs —these are possibilities conjured by Boy- ette’s air electric car. After being started by batteries, the car needs only air. to keep it running—a close approach to perpetual motion. Inventor Boyette claims his invention is quite simple, even though it is contrary to all principles of engineering. Large tanks on the sides of the car are pumped with compressed air by a starting air compressor which is driven by an aux- iliary electric motor and 4800 pound stor- age battery set. Compressed air then oper- ates the air engine connected to the driving wheels, bringing the car up to speed. As the car moves, a large air compressor directly connected to the front wheels pumps air back:into the tanks. An electric generator connected to the farthest rear pair of wheels is continually charging the batteries. Thus the movement of the car refills the air tanks and partly recharges the batteries. With the engine pulling two passenger coaches over a 250 mile rail run, it is said that about $2.50 worth. of electricity. for fully charging the batteries at the end ‘of the run will be the only fuel: expense. Inventions for February 12. GENERATOR WHEELS 4. AIR TANK 3. COMPRESSION i ENGINE 8. COMPRESSION ENGINE FO ENGINE n. DRIVING 7 COMPRESSED 6. DRIVING HEELS AIR DRIVES WHEELS “Wingless” Autogyro Is Successful . WINGLESS type of autogyro plane, de- ‘signed and constructed by Juan de la Cierva, inventor of this type of aircraft, rose from the ground after a run of but 10 yards'in its first test at Hanworth Air- port. The flying “windmill,” absolutely with- out wings, is supported in the air by the tremendous wing-spread of the horizontal propellers, and'driven forward by the cus- tomary perpendicular airplane propellers. Wingless autogyro designed by Juan de la Cierva takes off- for its fitst tèst at Hanworth Airport. Horizontal propellers. replace wings, enabling take-off in 30 feet. 45

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SOUTH POLE Broadcasting Admiral Byrd, bundled in furs, will broadcast his flight over the South Pole. The tifle will be part of emergency equip- ment carried in case of forced landings on barren Antarctica. 46 For the first time the world can listen in to the thrilling, dangerous adventures of sixty men on the frozen continent at the bottom of the earth. Here is the complete story of this. outstanding radio feat. The ice breaker, “Bear of Oakland” (above), will be the first of Byrd’s ships to reach Little America, where the expedition’s largest radio station will be established. HISTORY, adventure, thrilling explora- tion—all these will be enacted at the bottom of the earth when Admiral Rich- ard E. Byrd makes a double conquest of the air. Over the great sweep of pack ice, the lofty frozen peaks of Antarctica, a giant airplane will roar through a leaden, for- “bidding sky on another major epoch in the field of aviation. Rescues to Be Broadcast In the cabin of that plane, a band of dar- ing men, every nerve tense with the excite- ment of hazardous adventure, will bring to the rest of the world, seated cozily in the comfort of home, a vivid description of the bleak icy wastes of the polar regions: For the first time in history the South Pole will go on the air in regular radio broadcasting and the world will hear the words: “This is Admiral Byrd: spéaking- to you from the South Pole.” His airplane’s little 100-watt station will s >: Modern Mechanix and

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-Admiral BYRD Speaking! SUB BASE E00 W. TRANS) UNEXPLORED REGION Little America will broadcast 10,000 miles to New York-with a relay sta- tion at Buenos Aires, as shown in the above map. The “Jacob Ruppert” will take Byrd to Weddell Sea for takeoff on polar flight, later flying to South Magnetic pole. Only shaded areas on inset map have been explored. send through the ether a program more exciting than the greatest football game, more thrilling than the pulse-stirring race of the finest thoroughbreds of the turf. Should that Giant Curtiss Condor trans- port plane be forced down and Byrd and his men face death in the unexplored reaches of the great South Pole continent, radio will carry over the air every detail of the heroic rescue attempts. Each of the sledge parties, pulled by the expedition’s 150 Canadian huskies, will carry a radio transmitter and receiver when it sets out across the Ross Ice Shelf from the base at Little America on the Bay of Whales. Every one of Byrd’s four other airplanes, including an autogyro, will carry radio equipment when it takes to Inventions for February Jobn Dyer, shown in the control room of station KJTY aboard the “Jacob Ruppert,” will be technical engineer for the Columbia Broadcasting Company in Antarctica. This 1,000-watt transmitter will be installed at Little America to broadcast Saturday night programs of the Byrd expedition through Buenos Aires to WABC in New York. 47

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Radio Fans Will Hear Largest Seaplane Roaring Over the South Pole With a wing span of 82 feet and powered with two 700 horsepower engines, the Curtiss Wright Condor, shown above, will carry Admiral Byrd over the South Pole. the air, whether for rescue or exploration. Admiral Byrd’s second expedition to the South Pole, in addition to its great program of scientific research and exploration, will attempt one of the most ambitious radio projects ever conceived. From this frozen continent, as large as the United States and Mexico, Admiral Byrd will record the march of stirring events on a regular weekly program every Saturday night over the entire network of the Columbia Broad- casting system. To accomplish this he is bringing to the land where latitude ends 5,000 pounds of radio equipment, including five miles of wire, 300 vacuum tubes, and dozens of microphones and power generators. Here are the South Pole’s ra- dio stars. Huskies will bark over the air. Capt., Innes Taylor, dog mas- ter (at right), will describe his ad- ventures with the { Northwest Mount- ed Police. 48 Columbia’s chain will pick up running broadcast during the flight. And with him, too, are budding radio stars—members of his crew. There is Al- phonse Carbone of Boston, the cook, who will entertain Broadway, Hollywood, and the rest of the world with his melodies on the harmonica. Others of the crew will strum guitars and ukeleles, while the sled dogs will add their barks to the broadcast entertainment. Arthur Abele, Jr., 22-year-old Harvard graduate, will join in the broadcasts when he communicates with the tens of thou- sands of members of his “Little America Explorers’ and Aviation Club.” After in- ducing Admiral Byrd to take him to the land where latitude ends, Abele invited everyone of high school age or over to Charles J. V. Murphy (above) will arrange the Saturday programs for Columbia from Byrd’s Antarctica stations. Modern Mechanix and

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Crew and Sledge Dogs Will Feature All Broadcasts From Little America A budding radio star is Alphonse Carbone, expedition’s cook. He will play the harmonica on South Pole programs. join his organization and follow the expe- dition’s progress from the radio broadcasts on special maps and charts. Incidentally, during his two years’ stay at the South Pole Abele, who has never flown a ship, will take a complete course in aviation from Admiral Byrd and chief pilot Harold June. He will receive his ground work and actual training in the air in the 75 degree below zero climate of Antarctica. Another of the South Pole radio stars will be Captain Innes Taylor, head: dog driver and former member of the Northwest Royal Mounted Police, who will compare his ad- ventures in the wilds of the Yukon to the ice fields of the polar regions, Three regular transmitters will be on the air. Aboard Byrd’s steamship, the Jacob | sits Clay Bailey (left), is chief radio man and Guy Hutcheson short wave operator for Admiral Byrd’s expedition to Antarctica. Dots and dashes, keeping in touch with the world and Byrd’s bases by. short wave code, will be the work of Richard Watson, Bear’s radio operator, Ruppert, is a-1,000 watt short wave trans- mitter that will be the main broadcasting station of the expedition. It will be in- stalled at Little America, 800 miles from the South Pole. A second transmitter, 200 watt, will be set up at the sub-base of the expedition at the foot of Queen Maude Range, 300 miles nearer the Pole than Little America. (Continued on page 129) The Jacob Ruppert, carrying main station . of expedition, is now on the air as it nears - Antarctica. Its radio station will be trans- ferred to the -base at Little America. Inventions for February 49

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“Bartel Ship” Skips Over Ocean Surface at 100 M. P. H. — LU Above: Working model of “Barrel Ship,” showing fins which revolve with outer cylinder, and decks at end. Below is artist’s conception of ship speeding over water surface. Bears Dragged in With Pole Sled N THE wilds of the Wyoming. Rockies, rizzly bears are still making life miser- able for cattle. : Western.cowpunchers have adopted the Indian method of bringing home the “bacon,” in: which long pine poles are fastened to the stirrups of their cowhorse, and the dead bear tied on to cross-pieces. In one instance a grizzly killed a 1200 pound bull. After eating his fill and taking a nap, he dragged the carcass to a large windfall 150 yards away and partly covered it with heavy tree limbs. WORKING model of a revolutionary type of rotary ocean vessel, known as the “Barrel Ship,” was recently demon- strated in Seattle by its inventor, Captain Harry Barlow. : The machine consists of two cylinders, the inner of which is stationary, and con- tains space for cargo, passengers and pro- pelling machinery. The outer cylindrical shell is fitted with paddles, and revolves to push the queer ship over the waves. The interior decks are hung from the central axis, and heavily weighted to pre- vent any pendulum-like swinging. At the outer ends: of the cylinder are cabins con- taining control machinery and promenade space for passengers. The inventor asserts that a full size ship will travel at a speed of 100 miles an hour, going over the surface of the ocean with a sort of skipping motion. Radio Detector Finds Old Cannon RADIO treasure finder was used to locate long buried Revolutionary War relics on Red Bank Battlefield, just across the Delaware river from the Philadelphia Navy Yard. An eight-foot cast iron cannon and two ‘ancient rifles were found just four feet from the Fort Mercer monument. Changes in the tone of an oscillator in ‘the radio. equipment enabled searchers to locate ‘the exact positions of cannonballs ‘and other pieces of buried metal. - The search will be continued until the entire battlefield has been covered. The Red Bank Battle was fought at this spot October 27, 1.777, between 400 Colonials and 2000 British. Hessians. Fort Mercer was blown up. at-the approach of Lord Corn- wallis’ forces, and relics have previously been very difficult to locate. Photos Courtesy Sports Afield. Above pole sledge for dragging big game home with a horse can be rigged up in a few minutes. Western horses will not allow even dead bears to be brought near them, and cowpunchers distinctly do not like: to tote heavy bears or deer on their backs. At right a young grizzly reverses usual custom and “trees” a bear-hunting cowpuncher. In national parks bears are quite tame and friendly, but not out West! 50 Modern Mechanix and

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“Business cAdvances With New Inventions Ideas are the lifeblood of business. Here are new ideas, new inventions which you may employ profitably at your work. An electric regulator controls the drafts of any furnace and keeps the temperature of a home constant. Marking air mail letters with red and blue rub- ber roller stamp immediately calls attention of the recipient to the importance of the letter, even though he has not seen the air mail envelope. ‘ Magnet on new can opener catches tin shavings that ordinarily fall into the can. The revolving opener also turns down the sharp protruding edges. Automatic carburetor control is being manufac- tured which provides the proper air mixture under all weather conditions. The thermostat moves a fraction of a thousandth part of an inch for each one-half degree change in temperature. Rubber sponge attached directly to a garden hose makes car washing an easy task. rm These rubber kitchen utensils have the advantage of being unbreakable. They are also practically noiseless. Rubber ice trays simplify the problem of remov- ing ice cubes. Just bend the tray and the cubes fall out. Latest electric refrigerator automatically turns on refrigerator after defrosting is completed. An air cooled cushion for the office or auto is made of sponge rubber with ventilating air ducts. All tarnish is thoroughly removed from silver- ware dipped in warm water in which secret formula tablets have been dissolved. Chemical reaction does the cleaning. A pulverizer for the office washroom makes soap powder from ordinary bar of soap by simply turning a crank when soap is needed. A cocktail shaker top that fits any drinking glass Inventions for February Here is the latest in midget radios, no larger than the glass at right and small enough to fit in a coat pocket. can be carried in the pocket. A slight turn and it adheres to the glass. A new air electric heater circulates warm air in all directions without a fan. It is 15 inches high and 8 inches in diameter. More ice cubes can be had with series of shelves that fit into refrigerator. Each shelf holds two trays. Device connects with freezing unit. Editor’s Note—Information on any of these items can be obtained by writing MODERN MECHANIX AND INVENTIONS. Manufacturers are invited to submit material for this page. This auto generator produces 110 volts A. C. to run the home radio, neon signs, house trailer, powerful spotlight. ol

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Something New under the Sun A RADIO WILL BLOW OUT 1A MATCH! -Certain shrill Sounds caming over the rado 5 will extinguish a lighted [JOLDIERS DODGED CANNON BALLS RET O PRT ae fa BEFORE THE CIVIL WARI—7#e SPERE un ; old Solid shot cannon balls trav- © John A.Otlerness, Chicago, Ml. elled not more than 800 ft. a secony 3 times as Jast asa hard hi e balk Robt We Coton EM ADC VERY SIDE HAS A SOUTHERN:EX*| < -K7 -MOKE CAN BE BLOWN OUTOF POSURE IN THis Housel st a . Big EVES I Liris ciH De ene rections would be South £2 Souar ae a vi PALE POIO LOAR O TE TIS DaS:

House were built at the north pole. Sts Tiom The nore To The eyes are large ULE a rete A \ th fo alle he fo Dass É ; snond bedord, St Johushurg VE z podore RG Welt ane. On the surface many odd facts that seem to defy natural law are easily understandable when the physical conditions back of the phenomena are known. Here are two pages illustrating facts that appear fallacious at a casual glance, but which ate quite natural when all conditions surrounding them are considered. Remember Nic Sprank pays One Dollar for all scientific oddities acceptable to Modern Mechanix editors. What have you to offer for Nic Sprank’s pages of oddities? 52 Modern Mechanix and

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in Oddities of Science.’srranx tL Ze [icuT. AN ALCOHOL LAMP WITH A GLASS. ROD — Dipped in porassiuit per pf) 7 Spier Bia fe maleni (eS TIN, a With waterand sulpluticacia, Leactiot CAUSES OZOHE, < CORÇCRÍLALGA OXYJER, ` | - mhich lights alcohol: John Kakalec, LM. Ado0, Pate aaa fLECTRIC MOTOR RUNNING FAST USES LESS ELECTRICITY !~WHer the armatrre . &3 Turning rest, it generates 2 hack current LA lit: bach the input current. This does ro Yt Where Uke polar revolves Sony. lvold Prerbower, FF Seattle, Paf ; ey oF Man 1S WORTH 92 CENTS!~ Broker into elements, the body of man would yield lime, Sugar, caba rodine, waler ‘as, Salt, and iron that cold Ze valued. at only 82 cents. RA —Morton Harris, fon Srooklyn, UY $ Oe 20 PILL IS WORTH MORE THAN $20 GOLD PIECE! OzAby / Federal Reserve Bak orficials i ee gu Coins are a e aClual amount O1 0} COIL gol EH Ld He SOIL, Newlork, NY |

These strange facts of science may bring to mind some of the things which on every hand refute some of the accepted notions about nature. ONE DOLLAR will be paid you by Nic Sprank for every Oddity he considers good enough for these pages. Try your luck! Send in something new—don’t re-hash the obvious, and your chances of getting a dollar bill are as good as the next man’s. Address Nic Sprank, care Modern Mechanix, 529 South 7th Street, Minneapolis, Minn. Inventions for February 53

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World’s Greatest Underground Fortifications Guard France “VILLAGE MEN DEFEND FORT NANA RAS AR SS SSN AXNARAARRARAS ANA MANA AA MARRS ARRAN ARRAY ASASIN y SS N ANAS SREY N N: Ss K N Lf, Z, 2 77 AA Lr. PRA 42 44, 7 Lf, 7 77 Go 77 yy 77 A 7 PRA AN oe ¢ Solid black line shows location of 200 mile system of French underground forte, opposite disputed Saar basin. German Rises Six Miles in Rocket N HISTORY’S first successful rocket flight, Otto Fischer, brother of the inventor of the rocket plane, was shot 32,000 feet into the air in a shining 24-foot steel projectile. With a blinding flash the rocket ship shot out of its steel framework and disappeared into the sky. It reappeared a few minutes later, dangling from a parachute, its pilot maneuvering to land on the little island of Rugen in the Baltic Sea, where the flight started. The pilot was quoted as saying, “I left the ground in a deafening roar and lost con- sciousness for a moment. When I came to my senses the altimeter was flickering at 32,000 feet. It began to drop rapidly. I pulled the parachute release ring.” 54 Buried deep beneath hills are the impregnable forts shown in the above drawing. Even railways are provided for. NVISIBLE and sunk beneath the rolling and wooded terrain in Lorraine is a great underground fortification system, 200 miles long, guarding France’s vital industrial area. The forts, which cost 150 million dollars, are the greatest in the world and defy at- tack by gas, infantry, artillery, or air bombs. Living quarters, magazines, power stations, and conirol stations are out of reach of all means of attack. Bulkheads in the under- ground passages shut out both gas and in- vaders and armored posts at various points bring additional protection. Moisture Fan Bests Tropic Heat EW air condi- tioning fans, tiny but wonder- fully efficient, are being installed in every French gov- ernment office in the tropics. A drum filled with ice water or other liquid re- volves inside the unit, throwing liquid out through short capillary tubes into blades of two fans turn- ing at 4000 r.p.m. Large halls can be cooled and hu- midified in 10 min. In this French air condition- ing unit, the fan blades, driven at a speed of 4000 r.p.m., cool rooms with washed air. Modern Mechanix and

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Diesel Car Breaks World’s Record Despite a Heavy Rain Flashing over the famed Brooklands, England, race track at 103.25 m.p.h., Captain Eyston set a new world’s speed record for Diesel-powered automobiles, NEW world’s speed record for Diesel- powered automobiles of 103.25 m.p.h. has been set by Captain G. E. T. Eyston at the Brooklands, England, race track. Despite heavy rain that necessitated using non-skid tires, Capt. Eyston beat the previous record of 100.75 m.p.h. created at Daytona, Florida, in 1931 by C. L. Cummins. l The six cylinder Diesel engine develop- ing 130 hp. and weighing only 1,414 pounds, is exactly similar to engines used in many London omnibuses, The completely enclosed streamlined body is a radical departure in racing car design. The streamlined tail contains a tank holding sufñcient fuel for 800 miles of normal driving. Fuel consumption at racing speed is only twenty miles to the gallon. Efficient Antenna for Auto Radio MANUFACTURER of radio equipment has designed a novel antenna for auto radios. As shown below, the antenna is attached to the underside of the running board where it is out of the way. Two thin strips of rubber sheeting in which fine copper wires have been vulcanized form automobile radio antenna. Inventions for February The car is a comfortable salon model with enclosed, streamlined body. New Craft Makes Veneer Effects Intricate inlay designs can be worked out in various colored woods by anyone with “Intarsia Craft.” Paper-thin sheets of wood come glued to a muslin backing and al- ready punched in differ- ent shapes. The inlay Pieces are glued to the wood being decorated, smoothed down with a hot iron, and varnished. ECORATING furniture and wood novel- ties with beautiful natural wood inlays is no longer the sole accomplishment of the patient wood carver. Wm. A. Gillies of Milwaukee, Wisconsin, has developed a process whereby wood can be sliced into sheets 1/85th of an inch thick, and mounted on a glue-faced muslin backing. This sheet of natural wood is so thin and pliable that it can be rolled around an or- dinary lead pencil without cracking. Accurate presses punch intricate designs from different varieties of wood, eliminat- ing the tedious hand cutting and fitting of ordinary inlay work. 55

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Stove Top Oven Among New “What won’t they think of next?” the surprised householder asks as a compressed air toothbrush is added to the month’s discoveries. Air BRUSH FOR TEETH A brand new idea in ovens is one which fits the indi- ` £ vidual cake tin and can be used on top of the stove An air gun which instead of in the regular big oven which takes a lot of sprays the teeth : : Ses gas to run. Irt has a funnel shaped opening in the base with compressed air = of the bake por which gives even distribution of heat. and carbon dioxide ; Being sealed it preserves the moisture of the object has been introduced which is baking and therefore does a better bake job. in England at South Kensington, where dentists of the right little, tight little isle recently convened. Pressure and chemi- cal action do the work. The action is said to be: non- painful and harm- less to the teeth. For cooling bottled beverages a convenient unit is now available which stores the beer in a hexagonal tub over which is a rotary ice chopper which shaves ice cubes into chopped ice. The steak waffler shown at the right will make the toughest flank steak taste like tenderloin, The rotary knives break the fibers up into units that cook easily. 56 Modern Mechanix and

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HOUSEKEEPING Ideas Waffled steaks, oxygen beauty baths and serve-all scissors are among the latest gadgets introduced to the home. These all-purpose kitchen scissors have been recent- ly introduced to serve many pur- poses in the kitch- en. Vegetable slicer, bottle open- er and cap puller ate ‘included in its many uses. Above: Ann Lee, motion picture player, visiting the American Beauty and Styles Exhibition in the’ Grand Central Palace, -N. Y., tries out the oxy- gen bubble bath. This new aid to beauty mixes 20 per cent oxygen with air. The treatment results in bleaching. beautifying. Above is shown a silent portable humidifier for use in rooms difficult to keep comfortable. Right, above, shows new portable home manicure set which much is claimed for, including its ability to do the difficult task of polishing toenails. Inventions for February 57

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Pilot James Wedell, premier air speed king of Patterson, : - La., as he looked just after he set a new air speed record : of five hours, one minute and thirty-nine. and two-fifths seconds between New York and Miami for a purse posted by Col. Henry L. Doherty. The ship is of Jimmy’ s own design, a Wedell-Williams racer which holds the world’s record of 305.33 miles per hour. Jimmy got his start roping Texas steers. A RED and. black monoplane flashed past the packed stands in the International Air Races at Chicago at five miles a minute. One of the judges looked at his stop watch and’ grinned. “That? s just a bronco buster riding hard,” he said. “Jimmy Wedell’s in a hurry again!” The story of how a Texas cowboy cor- ralled.a world’s speed flying championship is another American epic of opportunity, one with its genesis in a boy’s liking for riding and tinkering. It began on a cattle ranch in Texas before the World War. Started Out in Texas The world is asking: Who is this Wedell who garnered newspaper headlines? Five- miles-a-minute Jimmy is a quiet, modest fellow. in his thirties, a small package. of five:feet eight in height and poundage little more than 130. He has brown hair which is always rumpled over his forehead, and blue eyes andia smile. His browned cheeks spell out-of-doors. He was a‘kid punching cows on a ranch in: Texas, a contented boy in a world of. 58 steers and horses, bacon and beans. He rode herd, a-singing—“I been punching Texas cattle on the Lone Star trail, singin’ ki yi yippi yappi yay, yap-pi yay—” But one day in town he drifted into a garage and héard motors. He helped a friend tinker -with a motorcycle, and ac- cepted a dare to do some “cycle busting.” He climbed aboard this new kindof bronco and took it for a rip-snorting dash through: the town. When he went back to the ranch he kept hearing that motor. He sang then: “Well, Pll sell my saddle and FIt buy me-a pow, and Dll swear begad, PI never rope an- other cow!” He packed his overalls and went to town and got a job in the garage. Texas horses were too slow. He wanted to go places fast. He punched flivvers and wrangled wrench- es. Jimmy and motors seemed to have a natural affinity. In a week he knew exactly what was inside a flivver. When the motor- cycle was pushed in again forrepairs Jimmy worked on it after hours without charge. (Continued on page 136) Modern Mechanix and.

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Winners of the Cigarette Polder Contest Here are some of the many entries that were submitted in Modern Mechanix’ $150 novel Cigarette Holder Contest. } NNOUNCEMENT of a $150 contest for &-novel and different cigarette holders in the: November ‘issue brought a flood: of en- tries to the offices of MoDERN MECHANIX AND FNVENTIONS. The judges had little difficulty awarding the. first three prizes as the winners were- outstanding, but it took much consultation to: decide on the other ten prize winners. First prize of $75 went to Oscar E. Olson, ef Minneapolis, whose entry was the best example of fine workmanship.- The central idea. was a “Conestoga wagon,” used by western pioneers. It was built to scale and under the covered upper scction of the wagon was a receptacle for cigarettes and matches. A stump near the wagon is used for snuffing cigarettes and two trays are provided for the ashes. Second prize of $40 was awarded to H. O. Slipp, of Sioux Falls, S. D., for an entry that combined good workmanship with ingenu- ity. It is Davy Jones’ Locker in which the cigarettes and matches are hidden. The lower part of the chest is cut away.-and by an ingenious arrangement of plates of glass, en which fish and sea plants were painted, an illusion of underwater life was created. Third prize of $25. was given to Louis Mika, of Chicago, for the best of the novelty eigarette holders submitted. It consists of a pair of donkeys standing before a manger that-is the ash tray. By pushing down the head of either donkey-a mechanism inside the body causes a hind leg to kick out a cigarette. Inventions for February Ten fourth prizes of $1 each went to H. J. Seckel, Marion, O.; Gene E. Stemmer, Upper Sandusky, O.; Thomas Gaskell, Al- bany, N. Y.; John N. Mattson, Stanchfield, Minn.; Jacob Gerbig, Baltimore, Md.; M. G. Hartley, Gasport, N. Y.; Charles J. Campbell, Madison, Wis.; M. Charles Iverson, El Paso, Texas; Edgar Hiler, Douglas, Arizona; and Arthur Gifford, Los Angeles, Cal. Many of the builders forgot some impor- tant points in constructing their entries. Cigarettes in the open air dry easily, while some discharging devices crushed them. The covered wagon in the foreground won the first prize of $75. At right Davy Jones’ Locker with a view of undersea life took the $40 second prize. Third ($25) prize went to the mules that kick out cigarettes by pushing heads down. 59

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The seadrome will be anchored to a huge buoy, secured by a 1,500 ton anchor. In- set shows Mr. Arm- strong, the inventor, with a working model. 60 Here is what the full sized Armstrong seadrome will look like when completed. At first but one-fourth of it will be built, the more economically to test the flotation prin- ciples of the submerged ballast tanks. Later the complete. six-acre field may be built, with hotels at the side as shown or else on a lower deck, according to what tests prove. by BEN LINCOLN Prunes recently appropriated by the gov- ernment have put the United States De- partment of Commerce, Aviation Branch, squarely behind the immediate develop- ment of a chain of five floating airports which will span the Atlantic for regular airways service. This recently announced appropriation,’ amounting to $1,500,000 was negotiated by: Eugene L. Vidal, Director of Aeronautics.of. the Department of Commerce, in behalf:of. Edward R. Armstrong, inventor of the séaz drome, and completes a 16 year fight to gain recognition for a project which both: Mr. Vidal, a competent and experienced air- ways operator, and Mr. Armstrong solidly believe in. As well, it will provide work for a great number of unemployed, as 80 per cent of the cost of such development ` projects goes to labor. Modern Mechanix and,

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to LINK CONTINENTS Y The ever enterprising Germans have already proven the island idea with a ship, thus proving the feasibility. from an aeronautical standpoint. The estfalen,” shown above, was stationed midway between Africa and South America, serving the Dornier seaplane as a stopping point in a recent flight. Ships cannot perform the service of a seadrome, however. This $1,500,000 is for immediate experi- ments with aquarter-section ocean landing- field and ends a sixteen-year struggle for recognition of the seadrome system. The final plan calls for a $30,000,000 outlay by the government, contingent on the success of the preliminary experiments now under way. According to information gathered by this member of the staff of MopERN MECH- ANIX AND INVENTIONS, the ultimate plan calls for similar seadrome stations in the Pacific and other oceans, giving the United States an international. supremacy of the air lanes: Great Britain and France both gave the Armstrong plan serious consider- ation but failed to adopt it. The proposed system calls for five Arm- strong seadromes at 500 mile intervals from the Atlantic seaboard here to the western coast of Europe. Each drome will cost $6,000,000. Back in 1927 when Armstrong completed his first models of the floating deck; he a O BERMUDA ed | The ship idea pre- .| vents the use of. landing with am- i Fiying aboard the German ship “Westfalen.” intended to have hangars and hotels on the six-acre surface. But the desisn which has been accepted by the government calls for a vacant deck, with hangar and hotel. ac- commodations confined to two or three. decks below the surface. The seadromes will be 1,225 feet long and- 300 feet wide. An elevator will take planes (Continued on page 138) Eventually, if tests prove successful, the government seadrome chain „would dot the Atlantic as shown for 30-hour service between Europe and America. These five seadromes would be situated in fair weather latitudes 500 miles: apart. Inventions for February 6l

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Abraham Lincoln’s Old Town ‘Rebuilt Main street in New Salem, IIL, rebuilt as a shrine to Abraham Lincoln, is shown above. Buildings are replicas. m In this building, the Hill and McNamar store, Lincoln served as postmaster in a career leading to President. N THE only undertaking of its kind ever attempted, Illinois has rebuilt New Salem, pone of Abraham Lincoln from 1831 to This collection of log cabins, stores and workshops has been rebuilt as a national shrine to the young man who arrived there penniless and left it as a step in a career that led to the White House. Thirteen of the original nineteen build- ings have been finished and furnished in many cases with the original furniture. The only modern structure in the village is the Lincoln Museum which in the future will be hidden by trees. Otherwise the village stands just as it did when Lincoln was postmaster and storekeeper and court- ed Ann Rutledge. The large Rutledge Tavern has been 62 This old map shows New Salem as Lincoln knew it over a hundred years ago. Here he courted Ann Rutledge. Restored interior of Samuel Hill home shows the spinning wheel, old clock and other furnishings of the 1830's. built with the original well from which Lincoln drew his drinking water. Next to the Henry Onstott home is the original workshop where Lincoln studied law by reading Blackstone by the light of burning barrel shavings. Modern Mechanix and

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Belgian Helicopter Stays Aloft 10 Min. to Set Record Queer Belgian wingless helicopter_stays in air nine minutes and fifty-eight seconds to set new world’s record for vertical ascent by heavier-than-air craft. A QUEER Belgian helicopter, entirely without wings, recently set a new world’s record for heavier-than-air craft designed for vertical ascent by remaining in the air for 9 minutes and 58 seconds. The strange craft has a centrally located aircraft motor mounted on a framework of steel tubing. Four-bladed propellers of hinged con- struction similar to the blade of an auto- gyro are mounted at each end of the frame- work, and:driven through gears and a steel driveshaft by the one engine. .The operator sits on a precarious perch to one side of the engine, the motor being just enough off center to balance his weight. Four feet-like projections at the bottom ab- sorb part of the shock in landing, and take the place of the undercarriage of a plane. Flashlight for Difficult Reading Al pocket size combin- ed flashlight and reading glass concentrates its light on the spot directly below the powerful glass. When not in use, the glass folds back com- pactly against the body of the light. It can be used to advan- tage in studying fabrics, old man- uscripts, fine Flashlight illuminates the reading Prin ting, an d matter while glass magnifies. delicate et chings. Inventions for February Two autogyro-like blades driven by a centrally mounted engine provide lifting power. New Rifle Shoots Beam of Light BULB BATTERIES ELECTRIC TARGET WD LIGHT BEAM — 3. BULUS EYE Ads SIGNAL’ “Shadolite’ gun, invaluable for target practice, shoots a beam of light. An electric eye behind hole in bull’s eye of target operates signa! when hit by light beam of gun. N INVENTION of considerable interest to rifle enthusiasts is the “Shadolite” gun. Without ammunition of any kind, this new gun registers bull’s-eyes and misses just as does an ordinary rifle. A powerful flashlight mounted inside a nine gauge shotgun flashes a beam of light at the target for any set interval of time ranging from zero to 30 seconds. A photo- electric cell mounted behind a hole in the center of the target causes a relay to oper- ate when the rifle is correctly aimed, there- by lighting a signal lamp. The aim of the gun may be corrected within the time length of the bullet beam. 63

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Russia’s Giant Snake Train Rolls Speedily on Steel Balls Russia’s newest electric train rolls on huge steel balls in grooved concrete track, Sunken windows. at the front of the streamlined engine give train appearance of huge reptile. Final model is expected to run 190 miles per hour. N ELECTRIC train which travels on A steel balls instead of wheels has been tested in Russia with remarkable success. The speedy train, which was designed by a young Soviet engineer named Yarmol- shuk, resembles a giant reptile weaving about the countryside. The inventor de- clares his final design will have a running speed of 190 m. p. h. Huge balls under each car roll on a single concave concrete track, greatly reducing rolling friction. Gyroscopes in each car keep the train balanced even on the sharp- est curves, and curved guards along the track prevent the train from tipping. 64, Mounted Animals Mimic Humans UNTERS are using taxidermy more and: more to preserve game specimens as mementos of enjoyable hunting trips. Mounted animals are being worked into useful articles for the home, such as table lamps, book ends, gun racks, and ash trays. Interesting groups picturing animals at some humorous occupation are finding great popularity as store window exhibits as well as for the hunter’s den. Rabbits, squirrels, birds, and even frogs can be mounted and arranged to represent human activities such as shaving, hunting, smok- ing, or studying. Sportsmen mount trophies as mementos of thrilling hunting trips. Right: Cleverly mounted rabbits portray a barber shop scene. Modern Mechanix and

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$25 in prizes for Solving Gear “Problem Numerals indicate the number : of teeth on each gear. The black M: M design: is painted on. each gear face, and is broken up as soon as the gears are turned. The shafts of the gears remain at points indicated. HARPEN up your pet pencils, dig up a ream of scratch paper, and get ready for some real fun with arithmetic and gears. You’ve all at some time or other watched trains of gears, either turning slowly and noiselessly as in clocks, or grinding noisily together in your automobile transmission. Well, that’s all we have here—a train of gears having different numbers of teeth. With the gears stopped, the letters “M M” were painted on the train, as shown above. f course, just as soon as the gears turn, the letters “M M” are broken up. _ And now for the preblem—with the driv- ing gear revolving 186,000 times per second, how long will it be before the gears will again be in position to form the letters “M M” as they are above? The problem isn’t by any means as hard as it appears to be, and most assuredly you won't need differential equations, infinite series, or Binomial Theorems to work it. You don’t have to send your calculations with your solution; just send the answer, aoe oe in less ‘than 250 words, how you got it. For the best solutions to the Gear Prob- lem, MopEeRN MECHANIX AND INVENTIONS will pay $25, as follows: First prize $10, second prize $5, and four third prizes of $2.50 each. Your entry should be postmarked not later than February 1, 1934. Decision of the judges, who will be MopeRN MecHANIX AND INVENTIONS editors, will be final. In case of ties, duplicate prizes will be awarded. _. Employees of this magazine or their fam- ilies are not eligible to compete. You don’t have to be a subseriber to enter this con- test, neither do you have to buy a copy of the magazine. Address your entries to Gear Contest, Modern Mechanix and Inventions, 529 S. 7th St., Minneapolis, Minn. Inventions for February THE DRIVING GEAR REVOLVES 186,000: TIMES PER SECOND Winners of the Shotgun Recoil Contest HE Shotgun Recoil Contest in the Decem- ber issue of MopERN MECHANIX AND INVENTIONS brought a very interesting batch of answers. A gréat many readers submitted the correct answer, but couldn’t tell just why it was correct. To Raleigh I. Low, Stockton, Kansas, goes the first prize of $10 for the clearest and most accurate answer. Glenn Haglund, 17 year old schoolboy, at Richfield Station, Minneapolis, Minn., receives $5 for his an- swer and unusually clear statement of the scientific principles involved. Four third prizes of $2.50 each go to J. Howard Kelly, Bristol, Virginia; Lynn Saulsburg, 5 Gilbert St., Le Roy, N. Y.; Jack H. Roberts, 4976 Catoctin Drive, San Diego, Cal., and Leo Schneider, Glen Ullin, N. Dak. And here is the correct answer, based upon the well-known law of physics that “to every action there is an equal and oppo- site reaction.” Wherever a force is applied in one direc- tion, there is always an equal force—or combined forces—in the opposite direc- tion. -In the case of the shotgun, whatever force is applied to overcome the inertia of the buckshot and give it initial muzzle velocity is also applied in the opposite direction, producing the recoil. In the case of the blank shell, the little kick is due to the force necessary to impart motion to the stationary column of air in the barrel and to the wadding, and to a rocket effect due io the expanding gases of the powder. When the gun is placed in a vacuum chamber, obviously the column of air iš removed. Therefore, the blank shell will have less kick than in the atmosphere. Since the column of-air will also be absent in the barrel with the loaded shell, the kick of this barrel will.be exactly as much less (Continued on page 120) 65

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Rum Ship Disguised as “Texas Ranger” Fools Coast Guard This rum ship, cleverly disguised as the freighter “Texas Ranger,” was seized in New York with 28,000 cases of rum. Pontoons Hold Roof of Gas Tank BULKHEAD. Floating roof of gasoline storage tank has air chambers separated by bulkheads. Framework at bottom holds roof when tank is empty. Screws press huge piston ring to wall. STEEL roof that floats up or down in- side a huge cylinder is now being used by oil companies to protect fuels in storage tanks. Air spaces built into the circumference buoy up the floating roof at the top of the liquid, much in the manner that pontoons support a floating bridge. A huge steel pis- ton ring fits snugly between the roof and the tank, sealing the tank from rain and preventing the evaporation of gasoline. Ad- Justing. screws evenly spaced around the ring tighten or loosen the seal as needed. The entire roof moves up or down in the tank as the gasoline level changes. A sup- porting framework at the bottom of the tank holds the roof when the tank is empty. 66 VEN though New York Harbor Coast Guard men had been tipped off that a big load of Canadian liquor was to be smuggled in, it took the hand of fate to” catch the smugglers. A Steamer. signalling as the “Texas Ran- ger,” inbound from Galveston, was_recog- nized and passed by all customs inspectors one night. The “next day word from the’ steamship company that the “Texas Ranger” was still 200 miles from New York puzzled officials. Customs men, hearing of a freighter grounded on the Hudson river near Haver- straw, hurried up and found the abandoned mystery vessel, with more than a million dollars worth of Canadian whiskey in her hold. The ship had been cleverly disguised to resemble the true “Texas Ranger.” Iron Horse Turns in 15-ft. Circle THREE-WHEELED truck intended to pull a number of trailers can turn com- pletely around in a circle scarcely bigger than its own length. This truck, manufact tured in England, makes it possible to save much time in getting into crowded ter- minals and docks. 3-wheeled truck for trailers maneuvers in 15-foot circle, Modern Mechanix and

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“Air Locomotives” Smashed for SAFETY The shiny, new ‘army pursuit plane above is be- ing crushed with . great loads of lead and by means of turnbuckles. The Army Air Corps requires “destruc- tion” tests before accepting ships. The 74-foot wing of a į Boeing air transport could lift the large loco- motive above. The wings stand up under a 3614 ton load, although entire plane weighs only six and one-half tons. NLISTENING and trim-looking, a new type army pursuit plane rolls out of the shops. Expert craftsmen have finished every detail and the ship is ready—not for the air, but for destruction! Without its wings, the plane is trundled to a test room of the Boeing Airplane com- pany. It is bolted into a wood and steel structure. Workmen load it down with hundreds of pounds of lead shot. To apply further stress turnbuckles are tightened ‘and more sacks of lead shot added. The ship groans, then begins to buckle slightly. A man peers through a sur- veyor’s level at the plane and makes notes of what he sees. Photographers take pic- tures at intervals. Finally there is a sharp crack as some- thing gives way under the tremendous load. “Very good,” exclaims the man in charge with a smile of satisfaction. Every new type plane designed must undergo this “destruction” test before Inventions for February ane Before this three-mile-a-minute Boeing transport ship took to the air, its mate was smashed to determine the greatest loads and pressure it could stand. Every new type plane must be destroyed before testing in the air. A transport’s all-metal cantilever wing starting to buckle under 24,000 pounds of lead shot. Note signs of stress on right side of wing in the above photograph. To insure high safety factor the landing gear of a plane is designed to withstand a load of 321% tons. Above— Landing gear being given a free drop heavy load test. pilots are permitted to test it in the air. The main parts of the ship, the fuselage, wings, landing gear and tail surfaces, are loaded down until something gives way. These tests determine the safety factor of the new plane. Army pursuit planes, for instance, are given destruction tests to be sure that they can dive at more than 350 miles an hour without shedding their wings. š 67

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Sword Fishing Gun Has Deadly Accuracy, 200-yd. Range UT in California the sport of swordfish- ing flourishes. A Santa Monica inventor- fisherman, Mr. C. R. Klein, after spending many weary hours in the harpoon pulpits, decided it would be easier to shoot a har- poon—the blade would travel more surely to its mark, and there would be less back breaking labor to the job of bringing in a marlin or broadbill. : So he invented the nifty little air gun shown at the right. It is a compressed air gun which weighs but 8 lbs., and which can be clamped to the gunwale of most any boat. It has a range of 200 yards, the har- poon being a specially constructed piston- like instrument capable of bullet like tra- jectory. : The barrel is 114” in diameter, and the air pressure, worked up by hand pump shown at the rear of the gun, is about 100 ibs. to the square inch. Being almost noiseless, the gun is very effective, and penetrates at great distances with lots of “wallop.” . Fire Proof Plane Design Successful News items recently car- ried the story of the test- ing of a new type air- plane covering and fuse- lage design. The tests were held in Belgium, and herewith are the first" pictures showing how Major R. Van Rolleghem, noted Belgian airman and inventor, first tested a model: in which white mice were unscathed. Right: Full sized model. TO FIREPROOF airplane, no fireproof mail pouch has yet been built. Re- eently, in Bel- gium, Major R. 68 C. R. Klein, of Santa Monica, Cal., with his eight-pound air gun which shoots its harpoon with great accuracy up to 200 yards range. It is fired by a trigger, pimped up by hand. Van Rolleghem, noted foreign. aviator, staged an air show of his own in which a fireproof airplane covering resembling mica coated asbestos came through tests triumphantly. : In a miniature airplane, shown at left, two white mice were pilot and observer. Gasoline was thrown about the tiny ship, ignited, and left to burn fiercely. The terri- fied mice were unharmed. Later, in a full sized model of a plane cockpit—Major Rolleghem sat with a mail pouch while flames seared about him. He, too, was un- harmed. Wood Grain Transfer Paper HE inexperienced worker can now ap- ply beautiful graining to wood by using transfer papers on which are printed graining designs perfectly imitat- ing the grain of beautiful and ex- pensive woods. The furniture or other object to be grained is first painted with a ground coloring and then is coated with glue size to hold the imprint- ed design. This is allowed to dry in the usual manner. The paper is placed face. downward on a clean table and moderately soaked with water. Then the paper is placed face downward on the wood to be grained, and with a brush the back is rubbed carefully. The paper can be used for two or three applications, Transfer papers for applying fine grains to coarser woods are avail- able for woodworkers. Modern Mechanix and

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Infantry Carries New “Deadly Artillery i ‘The new.Brandt infantry mortar is shown above in action, The shells, dropped into the muzzle, fire automatically. NFANTRY equipped with its own deadly and accurate artillery has always been the dream of military strategists. During the World War infantry often suf- fered severe losses because it could not obtain artillery fire quickly to wipe out machine gun nests and strongly fortified positions. Artillery fire was directed inde- pendently by higher command. The U. S. Army has met the need by de- veloping a new weapon, the 81 mm. Brandt mortar, which is capable of more rapid and accurate fire than the famous French .75 field piece and the old 3” Stokes trench mortar, developed during the war. Fires 30 Shells a Minute The Stokes mortar had a range of only 750 yards and its accuracy was bad. The new Brandt mortar has a range of 20 to 3,500 yards. It can be carried in three light loads, the tube, base-plate and tripod, and is easily transported over ground inacces- sible to any mounted artillery piece. The mortar tube is not rifled, accuracy being obtained by a streamlined shell equipped with vanes which open as soon Inventions for February Read The greater accuracy and range of the new Brandt mortar compared to the old Stokes trench gun is depicted above. Inset shows interior and exterior of seven-pound shell. Three men can carry the new Brandt mortar anywhere the infantry goes, as shown above. The man at left is carrying the tripod, in center the tube, and at right the base-plate. as the projectile leaves the gun. The shell weighs only seven pounds. Instantaneous fuses are provided, as well as time fuses _for penetration when shelling machine gun shelters and dugouts. The Brandt mortar can fire 30 shells a minute and up to two miles is more accurate than artillery. 69

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Expert GIPS on WINTER by Robert Page Lincoln Winter fishing is great sport if you follow these expert hints. You can increase your catch with the home-made equipment described here. g LOOP TO GO Through the northern ice of Canada Robert Page Lincoln’s huskies drag a canoe loaded with provisions. The author has covered the hunting grounds of the continent. The correct way to cut a hole through. the ice and a sure way to attract fish _to the hook is shown in these drawings. Sharp ice edges will cut your fish line. TO SURFACE OF FISHING HOLES TIED HERE ORDINARY CROTCH PULLS OUT AND UNWINDS A fish line crotch made from a tree branch will permit a fish to wear itself out as it runs away with the line. Another method, a simple winding stick, is shown at right. 70 nee? ICE CHISEL A good ice chisel can be made by welding pipe to an old wood chisel as shown at left. The chisel in use is shown above. The loop prevents the tool from slip- ping into the water accidentally. a“ 2⁄2 wooo CHISEL —— > UTTING through the ice and dropping a baited hook down to the finny inhabi- tants of the lakes forms a wintry pastime that is indulged in through the whole length and breadth of the snow country. That it can be made a very successful pastime, goes without saying. But to have the best results one must know thoroughly the equipment used and how to use it. Making Ice Chisel and Fishing Stick An ice chisel is a real necessity. Some use a common, everyday axe for the pur- pose, but it is unsafe and far from practical. You can make a good ice chisel by welding an old worn-out two or two and one half inch wood chisel to the end of a pipe one and one half inches in diameter. The total length of this pipe handle is four and one half feet. To aid in transporting this chisel, it can come in two pieces, jointed in the middle with a threaded end and coupling. To give the proper heft to the pipe section connect- ed to the chisel, pour that end full of lead. Thus every blow driven into the ice will have weight behind it. To the top of the ice chisel, turn on a T-connection,- which will give you a grip, and make it easier to drive into the ice Modern Mechanix and

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CHISHING Through the JCE FISHING STICK CHAIR CHAIR LEG Above at right is Two excellent fishing sticks, easy to make, are shown above. Line fisherman is hold- Spike | is jabbed ing the pistol grip “hooked.” type. Photo at the is wound around the projecting pieces of wood. into the ice for leverage against pull of fish after it is without hurting the hand. Through the hole of the T-connection, insert a loop of clothes-line, for a turn around the hand or wrist, which will prevent loss of the chisel should it slip from the hand. The fishing stick is a most desirable item in the ice fisherman’s equipment. A very excellent type can be made with a handle that is shaped like a pistol grip. The stick has a notched wooden piece on its side on which to wind the line. Correct Line and Minnow to Use A very simple fishing stick, devised by the writer, can be made from the leg of an old chair, leaving two of the rounds intact, cut off about two inches. On these round- ends the surplus line is wound. The turned part of the upper end of this fishing stick Diakes a good handle. Fishing sticks may be made from cedar, which provides a light item. To make the “spike” end of the fishing stick, to be poked in the ice'or snow at the edge of the fishing hole, drill a hole part way “into the end of the stick, drive in a ten penny nail or a spike and then cut off the nail and file sharp. A worn out icepick point makes sn unex- celled spike for a fishing stick. A new one costs only five cents. Inventions for February the chair leg fish- ing stick in use and at left the right is a closeup of the ice fisher- man’s tools, a home-made ice chisel and the chair leg fish stick. How to make and use these simple, but efficient, fish- ing tools is de- scribed in accom- panying article. For crappie, sunfish, perch and similar „small fish use a nine pound test, black, tournament line, even lighter than that if desired. For pike and pickerel fishing and heavier fish use eighteen pound test hard- braided line. Use the quill-type of sensitive float, for a cork is often deceiving and is not overly reliable. Minnows ranging one and one half to two inches in length are best for crappies, sunfish, perch, and other small fish. Min- nows ranging three to eight and ten inches are best for wall-eyed pike, great northern pike, pickerel. Hook the minnow for all manner of ice fishing through the skin and some of the flesh just back of the dorsal (back) fin, but. never so deep that the spine is touched as that will kill the minnow. Never hook the minnow as is commonly done in the stom- 71

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Here’s an Automatic Tip-up and Other Good Kinks for Ice Fishermen BREAD CRUMBS ATTRACT MINNOWS NOTCHED DOWN IN ICE HERE The automatic tip-up above is easily made. The rear end will swing into the air when a fish is caught, giving a signal to the fisherman who can be handling other lines. ach, in the mouth or in the tail. Hooked back of the dorsal fine the minnow can swim about, if the line is not too heavy. Minnows are often hard to locate in the winter, but they can be obtained by going to some pool on a stream containing chubs and shiners. Make a hoop from a wire a fourth inch thick and three feet in diam- eter. To this sew on white mosquito net- ting, the centre bellying down. Tie strings at several balancing points on this hoop, these tie strings meeting and connecting to the main cord. The main cord is held in the hand. Cut a hole in the ice larger than the net, 72 N PROTECT MINNOW AQ BUCKET WITH BLANKET fi il Above at left is a simple minnow net and a good way to attract minnows into the trap. To save the hands from cold water dip for minnows with a coffee strainer as shown above. Do not hook minnows through mouth or tail but back of dorsal fin. At left—Wrapping minnow bucket in blanket will pre- vent water from freezing. clear the hole of ice-scum, let the net down and then scatter cracker crumbs down over the net. Hundreds of minnows will be attracted into the net. Minnows can be kept indefinitely in a common wooden tub into which some water is permitted to dribble, allowing for an equal amount to escape. This provides properly aerated water. Feed minnows with a paste made from thinly ground beef liver, mixed with a little flour. Feed at least once a day. Fish Will Break Taut Line Set lines are not permitted in all states, but where such is the case the method illus- trated may be employed. It is merely a cross-piece laid across the fishing hole to which the “announcer” or “tip-up’ is slipped on through a hole in its center. The line is tied at the tapering end. The wider end is trimmed down thin. When a fish seizes the lure this announcer flies up and the line is ready to be drawn up with its catch. It is well-known in pickerel fishing that if the fish is given a taut line to pull on, it may break the line. One of the drawings shows a method of releasing line a little at a time with a crotch. By the time the fish has removed all the line, it will be exhaust- ed. The device is made from the wooden crotch of a tree, tying the line firmly to the handle and then stringing the line back and forth over the crotch, finally seating the line in a slit in one of the arms of the crotch. The fish seizes the lure, makes a (Continued on page 131) Modern Mechanix and

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Pocketbook Firecracker Alarm Catches Wife

Here’s the latest engineering triumph for hen-pecked husbands—a device which fits into the pocketbook, and con- tains a paper firecracker which goes off with the noise of a pistol whenever anyone attempts to remove the money. PAPER firecracker device which goes off with the noise of a pistol every time the pocketbook containing it is opened was Exhibit No. 1 at a divorce suit instituted by C. J. O’Brien, wealthy contractor of Baltimore. O’Brien told Judge O’Dunne how he had suspected his wife of taking loose change from his pockets each night, and how he caught her by rigging up the firecracker evice. Cobbling Bill Paid in Gold Dust

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Ed Lewis pays for repair work on his shoes with gold dust measured out on this crude, but accurate, yardstick balance. YARDSTICK, a knife, and a dime were all Ed Lewis, gold miner of Grant’s Pass, Oregon, needed to pay his shoe repair bill in gold dust during the banking holiday. Mike Byrd, the cobbler, set a dime weigh- ing .1 ounce on one end of a yardstick bal- anced on a knife, and poured gold dust on the other end until the stick balanced. His guess of $1.75 was nat over two cents off. Inventions for February Perfect Bed Built of Tin Cans BED built.of old tin cans, perfect in every detail and capable of supporting 1,000 pounds, has been built by J. G. Smith, an unemployed mechanic of Atlanta, Georgia. Three hundred and thirty-six tin cans of various sizes were used in constructing the bed. Except for the iron locks by which the head, footboard, and siderails are fitted together, and the iron cross pieces which support the springs, no other material was used. Even the bed lamp hanging from the head of the bed uses a tin can for a shade.

336 old tin cans of various sizes were fitted together by J. G. Smith, unemployed mechanic of Atlanta, Georgia, to make this unusual bed which can easily hold 1000 Ibs. 73

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“Treasure Map” “Discovered in Old Watch Above is the tarnished old watch inside of which the tiny treasure map, shown at right, and the letter was found. i CHART and letter giving the position of ‘A $250,000 worth of buried treasure on an island in the South Seas was: found by M. C. Rice, a Toronto watchmaker, while cleaning a tarnished old watch. He found the yellowed manuscript, protected by a velvet covering, inside a watch which had been given him six years ago by a woman, as payment for a clock repair job. The treasure map is circular in shape, and cut to fit exactly inside the watch case. The letter found in the watch is dated 1868, and says: “Paul, my son, I am not long for this world. I fear that E can not bring you this chart as I planned, so the only course left is to hide it in some place and hope you find it. I am the only one sur- viving with this secret. At the spot shown lies a tidy sum, at least 50,000 pounds (British) in gold bars and coin. This island is small, uncharted and far from the main sailing. The rock shown is large, with two small ledges. A line drawn through these bears west, northwest. Lay off 100 fathoms, then bear west, southwest and 100 fathoms more. The chest is buried eight feet. Good luck lad and leave the sea. It is no life for you. J. L. Trinidad.” Rice is now searching for the woman who gave him the watch. He believes the letter is genuine, and plans to organize an expedition to search for the hidden treas- ure. 74, Above is M. C. Rice, Toronto watch- maker who found the chart, shown at the left, inside- an old watch which he was cleaning. The letter accompanying the map told of $250,000 in gold bullion being buried on a small, uncharted South Sea island, and gave specific directions for finding the treasure buried 8 ft. deep. Popcorn Stand Is a Locomotive i N ACCURATE model of a locomotive ‘A built on a popcorn wagon is attracting considerable attention and has greatly in- creased the sales of a French popcorn and. peanut vendor. All locomotive parts above the wheels are ingeniously made from sheet metal. A small boiler supplies steam for the locomotive whistle, but this whistle has the characteris- tic squeaky note of the popcorn wagon. Corn is popped from the cab by push- ing the popper into the firebox. An enterprising French popcorn vendor built this model locomotive on his wares. his popcorn cart to attract attention to Steam is used to blow the peanut whistle. Modern Mechanix and

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Steel Booth Traps Bank Bandit, Sends Out Police Alarm OWING to rid the city of holdup men, Patrolman Vern Davidson of the De- troit force, has invented a bandit trap een he claims will end the bandit prob- fem. Looking-like a telephone booth, as seen at the right, the trap is wired throughout fer sirens and alarm bells. The door opens at a tangent allowing room for only one man to squeeze in, and must be closed before the entrant can get to the rear of the vault. When the bandit tries to get back out, he finds himself trapped, for he can open the door only when he knows the combi- nation to the pull-chains which operate the opening mechanism. Boxcar Homes for $3 Per Month N INNOVATION in living quarters is represented in a boxcar village which has recently sprung up in New York City. Inhabitants of this unique village, pic- tured below, pay only $3 a month rent, or $6 a week for room and board—reason- able enough in these hard times. Each boxcar—there are 40 in number— is equipped to sleep four men with re- spectable comfort, and has a wood stove, washing accommodations, and a carpet. When good times come back—which won't be long now—the village will prob- ably be abandoned. Alert business men, however, or leaders ef groups of organized unemployed should take a tip from this project and petition the heads of their local railroad for the use of eld box cars and spurs. A very useful com- munity can be built from the bodies of old box cars, as they are in the most cases very well built to carry grain and other perish- able bulk commodities, and hence make easy buildings to convert into livable homes. Being tight they are easy to heat. A winter’s supply of wood for the com- munity can be had by wrecking other cars. New burglar trap for bank vaults has door which closes on bandit when he enters to make away with loot. Only by pulling chains in right combination can he get out. Patient’s Heart Stops 4 Minutes REMARKABLE surgical operation in which a patient’s heart was held com- pletely still for four minutes so that a blood clot could be taken out, was report- ed from a clinic in Stockholm, Sweden. The Swedish surgeon opened the patient’s chest and made an incision into the heart, removing the offending clot. The wound in the heart was then sewed up and the heart was then massaged till it began to beat again. The heart was said to have been absolutely still for four minutes, nev- ertheless the patient recovered. Hundreds of New Yorkers who’ve been stricken by the depression find comfortable living quarters in this boxcar village, where they pay $3 a month rent and have many desirable home comforts, including a stove and carpeted floors. Inventions for February 7

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GUNS fromcAll NATIONS ek, Extreme precautions are taken by movie studios in handling the very real weapons used in filming modern thrillers. Left shows an expert marksman doing his stuff when the script called for a shattered door. Such times, sets are cleared of all hands, Above—A war scene from “Bitter Tea of General Yen.” HE machine guns of the beleaguered gar- rison, making a last stand, are rattling. and spitting fire at an enemy whose rifles. and revolvers crack viciously in reply.. Casualties are strewn everywhere and the acrid smoke of battle hovers over the scene. It is a critical situation, indeed—or ap- pears so. . Then the director shouts “cut,” and the “dead” and “wounded” arise and brush themselves off. For it is only a scene from a current talkie, and no one is really “wounded in action.” Prevention of Accidents Yet accidents might easily occur in mak- ing just such movie scenes as this, where firearms are used promiscuously. Unless extraordinary precautions are taken, a real bullet, for instance, might find its way into the thousands of blanks that are fired. And even the blanks themselves might cause severe powder burns and disfigurements within ten feet of firing. For this reason the motion picture studios employ every safe- guard possible in the handling of guns and ammunition. Indeed, as James Stembridge, firearms expert and custodian of the Paramount Studio arsenal, puts it, “Our precautions in- One type of prop the movies never need to fake is a gun. clude everything but hanging ared light on This is but a part of the arsenal at the Paramount Studios, the guns. where weapons of every conceivable vintage and type are “No company on the lot,” says Stem- kept under double lock and key to prevent mortal accidents bridge, “can get firearms, particularly ma- either in use or while in storage. Here revolvers of all P sge kinds from a six gun to a pearl handled pistol are stored. chine guns or ammunition, to use on sets 76 Modern Mechanix and

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Stock eMOVIE Arsenals Roland Young and Dewey Robinson, well known Paramount featured players, inspect a cornet of the Paramount arsenal, where machine guns and special army-type rifles are stocked. without having a permit signed by the head property man. And no outside studio can rent guns from Paramount without a special permit from the State of California. “We keep a record of each gun that gocs out of this arsenal—serial number, type, etc.— and we know every minute of the time it is in use just where we can put our hands on it. “Our machine guns are kept in vaults and our ammunition in magazines under double Jock and key. It is not only impossible for them to be stolen, but no careless person can tamper with them at any time.” When the arsenal gets a properly signed order for guns and ammunition, the wea- pons are carefully examined by the firearms expert and then locked in boxes to which the head property man has the keys. These boxes are delivered to the set where the company is working. The blank ammuni- tion is also delivered in separate lockers, thus blocking any chance of the guns being loaded by an unauthorized person. Rehearsals are then gone through, and the scene made ready for actual filming. The head property man in the meantime has loaded the weapons which will figure in the sequence. There is a final pause, when the even side of the set is cleared for forty eet. -~ Now the director signals “camera” and (Continued on page 128) Inventions for February James Stembridge, custodian and fire-arms expert for Paramount, also knows his knives. “In his care he has a collection of bayonets for all types of guns used by all nations. When a special model of gun is called for, such as a flint- lock, movie realism demands that powder smoke issue not only from the muzzle, but the breech lock as well. 77

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Miniature Racing Cars Are Latest L The start of one of the miniature car races that are taking the feminine population of Hollywood by storm. Dog Rolls Tires for Sport OLLING old automobile tires down the street is the favorite sport of Mickey, a Boston bull dog owned by M. Brown of Venice, California. Mickey, who always had a liking for any- ihing that rolled, learned to pick up the tire, balance it, and keep it rolling down the street without any aid or suggestion whatsoever from his master. A skillful push with his front paws, as he runs along on his back feet, keeps the tire moving. It just wouldn’t do to leave a new tire lying about near this dog’s territory. E: Mickey raises the tire from the ground with his teeth, balances it carefully, and gives it a push down the street. He can keep the tire rolling as long as he likes. 78 Fad in Hollywood Watch those curves, lady, or you'll take a bad tumble! Lona Andre is finding out just how fast the track is skid- ding under her as she takes a spill in her miniature racing car. ‘Putt-putting’? is Hollywood’s latest fad. 6¢PUTT-PUTTING” in miniature racing cars, Hollywood’s latest fad, is making a hit with the fair young ladies of our film capital. Tiny one-lung gasoline engines give more than enough speed to the tiny cars, and even the wisest of feminine drivers have been known to take spills on the curves. Races are held on the city streets, with starters, movie cameras to catch the spills, and of course mechanics to tinker with the motors when trouble threatens. New Cars Have Engines at Rear This stream-lined midget car exhibited at a Berlin auto show has its engine mounted directly back of the rear axle. Rear panel raises to allow access to the motor. 05E of the most popular midget cars at a Berlin auto show is powered by a small four-cylinder gasoline engine mount- ed on a framework directly back of the rear axle. A steel cover in stream-lined design cuts down wind resistance at tbe rear, and raises to allow access to the motor. Modern Mechanix and

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Ships SHauled by Rail Over Canal Lock A ship resting in a cradle car is Being lowere by rail in the above drawing of the new. type lock. Another ship has been floated by car- A working model of the rail canal lock designed by-German engineers is shown above, BY LIFTING or lowering ships from one water level to another on large cable cars German engineers have eliminated the usual complicated system of gate locks in a canal in East Prussia. Hauling the ships by rail also greatly. re- duces the time required to transport ships. The entire process of carrying a ship over the lock takes less than 15 minutes. The car used is a large cradle on wheels towed by a cable. It runs on rails under the water. The ship’s hull glides over it and moves along with the car. As the car starts to move uphill the ship settles firmly into the cradle. Powerful hoisting motors tow the car Inventions for February € The motor at the right pulis the cable which hauls the cradle cars holding. the ships. In the actual lock the motors will be housed in buildings. and the ship up an incline to . the higher level of water or lowers them gradually to the lower level. Electric power for the mo- tors is supplied by a hydro-electric turbine at the side of the lock which takes advan- tage of the difference in water level for motive power. The motors are housed on each side of the top of the incline. A working model of the lock has been built by the engineers and is now on exhibi- tion in Germany. Actual construction will be begun soon in a canal near Elbing in East Prussia. The German designers of the rail lock claim that it greatly reduces the cost of building canal locks and also the expense of operation. To a person standing some distance from the lock the ships ap- pear to be crawling over a hill. j 79

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New Lightweight Folding Boat Compact for Easy Portage The compactness of new folding boats, which are made of laminated wood and heavy canvas, is shown in photo above. The boats can be quickly prepared for the water. Motor Uses Half Teaspoonful Oil NLY a half teaspoonful of oil -will lub- ricate the smallest airplane motor in the world. The motor of the radial type is slightly over 13 inches high. It turns a propeller one foot long on a propeller shaft of tooled steel revolving on two Fafnir ball bear- ings. Fourteen tiny sparkplugs, a starter and small carburetor are among other in- teresting features of this motor designed and built by F. W. Gradiner. The rocker arms are chrome plated. The timing gears have a ratio of 6 to 1. They have 3/16-inch faces. The push rods of the motor are of tool steel and are ad- justable. The motor is oiled by gravity and splash. - Gradiner exhibited his miniature motor at the. recent National Air Races. He values his model at $2,800. The motor and its builder are shown in the picture to the right. Gradiner informs us that his motor was built on an ordinary 9-inch South Bend lathe, no special tools being required. 80 OMPACTNESS and portability feature a new folding boat made of laminated wood and heavy canvas. Oars, crosspieces and boat tie into a sim- ple bundle that can be carried easily by the outdoor man or fastened to the top of an automobile. Reinforced canvas forms the seams joining the wood sections. When opened and the crosspieces are put in place, the boat is ready for the water. Harold F. Wilson of Los Angeles is the inventor. Wheel Runs Automatic Tire Pump - When air pressure drops this pump automatically releases the bell crank which pumps up tire while car is moving. N AIR pump, that automatically keeps A tires at the correct pressure while an automobile is moving, has been invented by A. G. E. Nordquist, of Denver, Colo. ` The pump is attached to each wheel. When the pressure falls below the mark set on the gauge, a crank is released. A cam on the brake drum drives the crank of the air pump until the tire reaches the correct pressure. . : The pumping function then automatical- ly ceases until more air is released. Now someone should invent a deflator so that when a tire gets hot it will deflate. The smallest airplane motor ever built is shown in photo above. It is of the radial type and is slightly over 13 inches high. The designer, shown in the picture, is F. W. Gradiner. Modern Mechanix and

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Simple Memory Geat Amazes Party Guests This illustrates the ‘mnemonic’? system of memorizing which Mr. Yates describes. Each number in a list of 26 or 30 numbers is associated with a . LIST OF ASSOCIATED NUMBERS AND OBJECTS 1. A Anchor 15. O Owl 2. B Barrel 16. P Pump 3. C Coat 17. Q Quart 4. D Door Measure 5. E Engine 18. R Ruler 6. F Fence 19. S Saw ' 7. G Gun 20. T Tank 8. H Harp 21. U Umbrella 9. I Indian 22. V Vase 10. J Jar 23. W Wheet 11. K Kangaroo 24 X Xylophone i 12. L Lamp FA z zacht . . ebra F Pe or Extra symbols as needed | by R. F. YATES F ALL of the tricks performed at parties attended by the writer, not one has mystified or baffled those present any more than the memory trick about to be outlined. The master of it, when he enters into com- petition with any number of people, how- ever intelligent, however learned, is able to demonstrate a faculty for memory that will amaze and dumbfound everybody present. All of this entertainment can be the reward of but an hour’s intensive study in learning the very simple but very effec- tive mnemonic system that has been de- vised by the writer. Association, Secret cf System A psychologist will tell you that what- ever we learn must in some way be related to something that we already know. It is largely through this power of associating one thing with another that we learn and memorize things. That is the secret of our system; we simply learn a set of words in a peculiar manner. Then during a memory test, that may be instituted as part of an evening’s entertainment, we are asked to memorize thirty words. Given five min- Inventions for February master group of objects. When presented with an impromptu list, five minutes is given a person to associate the secondary list with the master list. By association of objects the second list becomes easy to recall. utes in which to fix them in our memory, we surprise those present by reeling the words off like lightning at the end of this study period. We not only do that, but we offer to call off the word of any particular number—3, 10, 19, 25 or what have you? The only requisite is that the words chosen be nouns for it is much easier to operate under this condition. The person giving the words to the group should also use numbers, that is he should number each word used from 1 to 30. Thirty Symbols Used Here is the method: First we write down numbers from 1 to 30. Then at side of these numbers we place the letters of the alpha- bet, beginning with A as 1, B as 2, and so forth until the twenty-sixth letter is reached. The two extra spaces are filled with ZZ and ZZZ. This is done just to pro- duce a round number.—See picture above. This list should be studied until the “memory expert” is able to learn the num- ber of each word used and to memorize thoroughly the word itself. For instance, when H is thought of the performer should immediately think of 8, its number. The list should be memorized so well that no (Continued on page 122) 81

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Rubber- Cired Grain cMakes 75 m. p. h. INNER TUBE ALUMINUM SAFETY RING \\ RUBBER SHOE AN STEEL FLANGE STEEL RAIL FISH PLATE 240 \\\ í =A? SZ =/= o: A. Ls AY a Sketch shows ‘how: rubber tires are kept on rails. Steel flange on inside of wheel keeps grooved rubber tires on track, Train rolls on solid aluminum safety rim inside of tire in case of a blow-out, wheel dropping but % inch. AILROAD officials throughout the world, alarmed at the rapid decrease in their passengers, are taking drastic steps to re- gain their lost trafic. New high speed cars, light in weight, stream-lined, and ultra- comfortable, are being put in operation to better serve the public. A two-car stainless steel, air conditioned, gasoline driven train, a veritable master- piece of metallic art, is now running be- tween Fort. Worth and Texarkana at sched- uled speeds of up to 75 m.p.h. Features sym- bolic of the-“New Deal” in transportation are the rubber tires, rubber cushioned trucks, sealed windows, and the use of “18 and 8,” a new chromium-nickel-steel alloy, for the metal body. The first car of the train contains a rail- way post office, a baggage compartment, and the power plant. Two 12 cylinder gasoline engines of the automotive type drive two generators which in turn operate powerful electric motors directly connected to the car axles. With this arrangement the gaso- line engines always run at their most effi- cient speed, and electric motors drive the car with a minimum of gears. A radical reduction in weight per pas- senger enables operating costs to be cut to 82 Riding entirely on rubber, this shiny, two-car stainless steel train makes up to 75 m.p.h. A gas-electric drive is used. Moderate stream-lining cuts down wind resistance. 35 cents per mile, making the train no more ‘expensive to run than a heavy bus. | Grooved rubber tires carrying 100 pounds air pressure ride on the rails, carrying the entire weight of the car. On the inside of each wheel is a steel flange which keeps the tires on the track. : An aluminum safety rim inside the tire holds up the car in case of a blow-out. With deflation of the tire the wheel would fall only five-eighths of an inch. In a recent test two tires were punctured by shot-gun fire while the train was travel- ing at 50 m.p.h. Passengers heard only a faint thud and the train kept speeding along. German Ship Gets “Face” Lifted HE German steamship “Hamburg” is having a major operation performed on it by shipbuilders. The old bow is being completely cut away in drydock, and a new bow, some 40 feet longer, will be riveted and welded into place. A great portion of the new bow will lap into the old ship framework, giving ad- ditional strength to the joint. Three other German passenger ships will undergo simi- lar lengthening operations. The German steamship ‘Hamburg’? undergoes a major operation. Right: Ship being towed into drydock, with most of old bow cut away. New bow at lefe adds 40 ft. to length. Modern Mechanix and

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Youth “Designs RADIO ‘Phone Exchange At 16, D. Reginald Tibbetts was hailed as a “boy genius” because of his work in establishing the first police radio system on the Pacific coast. And now, at 22, Tibbetts, a senior at the University of California, is blazing another trail in the interests of science by installing an ultra-high frequency radio telephone system for engineers on the $75,000,000 bridge between San Francisco and Oakland, destined to be the world’s mightiest span. The story of Tibbetts’ achievements is the record of a “radio wizard” whose suc- cess was brought about through an insa- tiable curiosity—a burning desire to find out “why”’—coupled with plenty of down- right hard work in the solitude of a little attic room at the home of his parents in Berkeley, Calif. It was back in 1927 that Tibbetts, a lad in high school, walked into the office of August Vollmer, then chief of Berkeley’s famous “scientific” police department, and outlined to Vollmer the details of a plan for police communication by radio. Struck by the lad’s sincerity and knowl- edge, and ever anxious to utilize the latest creations of science in police work, Vollmer assigned two officers to help Tibbetts and gave him carte blanche. (Continued on page 123) Tibbetts’ first short wave phone exchange will greatly simplify building the ’Frisco bridge, since boat-to-bridge and pier-to-pier talk is easy. Inventions for February D. Reginald Tibbetts, youthful California radio fan, with one of his short wave phones.

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Englishman T. Cox, of Yarnton, England, the man with the India rub- ber face. He challenges the world to pull an uglier face. Dog Is Mother to Baby Rabbits BESS: a three-year-old purebred Alsa- tian dog in Orsett, England, had no puppies of her own, but longed for some- thing on which to lavish her affections. She adopted a baby rabbit, and was happy for a time. The rabbit died, how- ever, and Bessie was so grief-stricken that her master bought her a tame rabbit. Although rabbits generally have a deep fear of all dogs, they seem to sense the affection of Bessie, and are happy with her. Bessie, a thoroughbred Alsatian, having no puppies of her own, plays mother to this tame rabbit bought for ber. 84 Swallows Nose to Pull World’s Ugliest Face HE man with the India rubber face is T. Cox, a farmer of Yarnton, England. He challenges anyone in the world to pull an uglier face than he can. So limber are his facial muscles that he can do just about everything but tie his cheeks into a knot. Cox is able, by drawing up his lower jaw, puffing out his cheeks, and raising his lips up over his nose, to give the impression of having swallowed. his nose. No “bogeyman” is needed in this little town, for he can scare even the bravest of the little tots into eating their spinach. Man of Future to Have One Eye AN’S eyes will come closer and closer together, the bridge of the nose will further diminish, and finally the two eyes will again become one—just one large, cy- clopean eye in the center of the face—if the predictions of Dr. Thomas Shastid of Duluth, Minnesota, come true. Dr. Shastid, eye specialist and editor of many optical magazines, bases. his predic- Artist’s drawing of the face of the future, having one powerful eye in the center of the face. Left eye of to- day will gradually shrink away; right will be cyclopean. tions upon his years of study of the eyes of humans, of animals, and of fish. The left eye is being used less and less today—and soon will not be needed. The new eye will have two spots of sharpest vision in each eye, just as many birds have today, to obtain stereoscopic vision. Although the ficld of view will then be narrower than now, the eye will be ex- ceedingly acute for colors, for motion, and for form. It will probably be able to per- ceive as light many forms of energy which now produce in human eyes no sort of impression. . Dr. Shastid found that the eyes of birds are the best on earth, and are sometimes 100 times as good as those of man. They can not see blues or violets at all, but can see infra-red radiations. ; Horses can see almost nothing above their heads because the lower part of their eyes are practically blind. The upper part gives off a bluish sparkle, however, which en- ables the horse to travel well in the dark. Modern Mechanix and

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1500 Newspaper Pages Preserved on a Single Roll of Film EWSPAPER files may be permanently preserved on photographic safety film, eliminating entirely the need for using val- uable space in libraries for storing old news- papers, and overcoming the problem of de- terioration of newsprint paper. This new process was exhibited at a librarian’s con- vention in Chicago by an eastern camera manufacturing firm. ` A viewing device used with the film en- larges the tiny page images on the film up to a screen image even larger than the or- iginal newspaper page size. Any part of any page in a month’s issues of a 50 page daily newspaper, stored on one reel of film, can be brought into view by manipulation of a lever on the viewing device. Radio Changes Programs Itself 7 Automatic station selector equipment in this radio may be set to turn on or off any of 8 different programs at 15 minute intervals, and to turn off radio at any given time. RADIO which thinks for itself, auto- matically turning on the best programs for any twelve-hour period, is the latest achievement of radio manufacturers. The receiver may be set to automatically change to any of eight different programs each 15 minutes, and to shut off at any desired time. Switchboard plugs for the eight stations fit into any of 48 holes spaced at 15 minute intervals around the face of a built-in elec- tric clock. With one cord plugged in at a certain time the radio will come on at that time, and continue to run on that program until the time at which the shut-off plug is located. Other station plugs are inserted ‘wherever a change of program is desired. Inventions for February PUBLIC offs LEDGER ` This viewing device for newspaper offices and libraries enlarges tiny film images of newspa- pers to one-half again the sizeof the original pages. Manipulation of a lever brings any part of a page from a month’s file into view without changing reels. At right is actual size. of image on film. Pages on film may be copied in their normal size on photographic paper, if desired. Coffee Pot on Truck Sings, Speaks HUGE coffee pot mounted on an adver- tising car of a Berlin coffee retailer sings and blares forth the qualities of a certain brand of coffee. A microphone, amplier, and loudspeaker inside the pot make it possible to broadcast music or speech as the odd car moves through the streets. The lid of the pot raises when the loudspeaker is used. The car has attracted a great deal of at- tention on the streets of Berlin, and has boosted coffee sales. This huge coffee pot mounted on a truck has a lid which raises up to blare forth music or advertising messages of a Berlin, Germany, coffee retailer as the car moves about. 85

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NEEDED INVENTIONS A vegetable slicer that can be used on any vegetable and which wili not cost more than fifty cents will reap a fortune. Likewise there is needed a new way to fasten carpets to stairways, and we need a new kind of snow plow for homes. NVENTIONS beget inventions; one new and great invention often makes neces- sary a thousand or more independent in- ventions. The electric icebox is an ex- ample. It should be borne in mind, too, that the electric icebox still has many inven- tions coming to it before it can be looked upon as a perfect device. Right now the manufacturers of electric iceboxes are sending out an SOS signal for a new and better way of opening icebox doors. When things are put away, the housewife often has her hands full and some sort of trip must be had to open the door that can be manipulated without the hands; preferably with the foot. A photo-electric cell has been suggested for the purpose, but I, for one, would warn my readers against perfecting such a thing for purely commercial rea- sons. True, it would work beautifully but at the same time it would add so much to the price of a refrigerator that it would interfere with sales. The trick should be done by purely mechanical means. Think this out and you make yourself $100,000 as easy as falling off a log. Vegetable Slicer Can you invent a 50 cent device for the kitchen that will slice vegetables? The housewife puts in a carrot, turns the crank and out comes sliced carrots, fast and fu- rious, one thin slice for every turn. The same should be the case with potatoes, >cumbers, etc. Don’t forget, in designing this contraption, that a little set screw should: be included that would make it pos- sible for the operator to adjust the thick- 86 ness of the slices. Keep in mind also the fact that the thing would sell quickly to a manufacturer if it were made almost en- tirely of pressed metal. There is a poten- tial market for 5,000,000 such articles and they should bring five cents apiece royalty. If you are good at figures, dope the reward out and get busy. A Window Within a Window The storm window has been with us for many years and it has become so common- place that it has escaped the aftention of inventors. Yet it is an inconvenient device if ever there was one. Once in place, it must be held open by devices that give trouble when the wind blows and through which many windows have been torn from their moorings. What is needed is a win- dow within a window, so to speak; a win- dow that can be adjusted perfectly so that the occupant of a bedroom may adjust the supply of fresh air to a nicety. This added feature should not cost over fifty cents and don’t think that the wooden slides now used solve the problem for people who want to sleep in cold rooms. What is needed is either a much better way of opening storm windows or a feature built right into the storm window whereby various openings may be arranged, preferably without draft. There should be about twenty new one thou- sand dollar bills waiting for such a thing. Slip-proof Method of Holding Stair Treads Will the man who can attach treads to stair cases without the use of tacks, brads or cement please raise his hand? What is (Continued on page 142) Modern Mechanix and

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Plane Forced Down; Pilot Scoots Away on Tiny Motorcycle This tiny motorcyele, carried along in an airplane, eliminates walking home after a forced landing. Although weigh- ing but ninety pounds, the one-cylinder engine will make 35 m.p.h. and run 110 miles on a gallon of gasoline. LEX BRUN, Cincinnati aviator, became tired of walking back home after fre- quent forced landings, and designed a tiny motorcycle which he now carries along in his plane. The midget cycle is only 36 inches long, weighs 90 pounds, and travels at a speed of 35 miles per hour. The powerful one cylin- der motor will travel 110 miles on one gal- lon of gas. Steering wheel and controls are much like those | found on automobiles. A stream- lined body adds to its speed and provides a comfortable seat for the rider. Projections on the body are used as foot rests. - 28 of Tiniest Books Fill Thimble HE publication and binding in leather of what is said to be the smallest book in the world has been completed by H. B. Woods and F. Vroom of Worces- ter, Massachusetts. The tiny volume contains 28 pages of verse by the Persian poet, Omar Khayyam. The book in its final bound form is 3/16” x 36”, less than half the size of a postage stamp. Twenty- eight of the vol- umes will easily fit into an ordinary thimble. A magni- fying glass must be used for read- ing the tiny but clean-cut printing of the book. Inventions for February the smallest published book in the world can be packed into the ordi- 28 volumes of nary thimble shown above. Radio Signals From the Stars Karl Jansky is shown at one of the instruments which he used to receive short wave radio impulses from the center of the Milky Way. He can give no explanation of the signals. ADIO signals have been received: from stars in the Milky Way by Karl G. Jan- sky of the Bell Research laboratories. The signals, which come in as a sizzling sound like bacon in a frying pan—come in on a wave length of about 15 meters. They were heard in greatest volume from the constel- lation Sagittarius in the center of the Milky Way. The signals, being continuous, could hardly be ‘interpreted as messages from heo- ple on other planets. 87

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Ride Side by Side on This New “Bicycle Built for Two” This “bicycle built for two” is made up of two ordi- nary cycles joined together by a steel framework and universal joints. Note that riders may be at different levels. Air Mattress Is Floating Bed N AIR mattress which can do double duty, both on land and water, is one of the latest innovations at Lake Wannsee, a Berlin resort. Inflated rubber compartments covered with cloth make this a soft, comfortable mattress for the bed. On water it will easily support two people, and afford an ideal resting place after a swim. It has a built-in pillow, so that the head is always higher than the rest of the body. With this rubber raft bathers can paddle far out on the water for their sun baths, or just float along with the wind—and dream. Float along with the waves and dream—bask in the sun after a swim—or frolic about as if on a magic floating catpet, with this air mattress made for land or water. 88 HE “bicycle built for two” of the gay nineties may become popular again. A device invented by Charles Nessom of St. Louis allows two ordinary bicycles to be coupled together so that riders can sit side by side and enjoy the ride together. The light steel framework contains uni- versal joints, so the two front wheels can be steered as one. Cross chains at the rear may be Ioosened to allow the two riders to pedal together at different elevations without danger of tipping. Coaster brakes allow the boy friend to do all the pedalling if he wishes, while his girl enjoys the scenery. If perchance a quarrel should develop, the bicycles may be separated in a minute, and no one will have to “walk home from the buggy ride.” The inventor claims the device repre- sents the first practical improvement on the twin bicycle in forty years. Largest Accordion Is Like Organ Jean Fiers, a Belgian musician, plays the world’s largest accordion in a Paris circus., It has 1300 stops, weighs 176 Ibs., and is 51% ft. high, Below is a standard accordion, HE world’s largest accordion, played by Jean Fiers, clown musician of the Med- rano Circus in Paris, sounds like a church organ when it is operated at full blast. The huge instrument is 5% feet high, and weighs 176 pounds. Playing it is not so easy, for there are 1,300 stops and a five foot piano keyboard. Musical effects from a violin squeak to a drum beat can be made. Modern Mechanix and

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Here you'll find the newest way to do that baffling little household task that has had you stumped. Screw Eyes Keep Boat Oars in Position WEEN the leather guide on rowboat oars becomes worn so badly that the oars slide back and forth in the oarlocks, it is sometimes difficult to obtain the proper kind of new leathers. An ordinary screw eye with an opening of approximately one-half inch will serve admirably instead of the leather. Remove all leather and nails from the oar, and insert the screw eye as shown in the drawing. It may be necessary to drill a guide hole in the oar to prevent splitting.— John Hayes. Sheet Cellophane Between Screens Makes Window OR that lake-shore cabin or cottage where glass win- dows are continually being broken while you are away, try this stunt. Get a large sheet of cellophane the size of your window, or enough small pieces which can be pasted together to make up the correct size. Cut two pieces of window screen to the size of the window being fitted, and place the cellophane between the screens. This combination may be tacked directly to the window frame, or to a wood frame.—M. J. Bolt. Wood Knob Increases Leverage of Hammer wis the ordinary carpenter hammer it is often- times difficult to pull out longer nails without using wood blocks to raise hammer above surface of the board. Cut a semi-circular block of wood from a % inch board as shown, and drill a hole just a little smaller than the diameter of a 1% inch wood screw. Fasten block to hammer as shown a puing OnE i ammer is automatically inc ae ike nail Gomes Sut of the board.—H. J. Norton. ORME HAMER Catch Holds Gar- ; - ey age Doors Open CRBOPCUUY TES simple and easily made catch will hold your garage doors open, but may be instantly released with- out stooping or using your foot. An angle bracket is notched as shown to form the latch. A wood block of the shape shown in the plan view is screwed to the garage door at a height of four feet, close to the hinge side of the door. The latch is fastened to the block with a wood screw, tightening the screw just enough to allow free turning of the latch. A piece of stiff wire is threaded through a sleeve bracket or screw eye at the front of the door, and fastened through the upper hole in the latch. A piece of clock spring fastened to the side of the block continually presses the latch downward.—H. S. Ray. Inventions for February 89 CELLOPHANE, 2 aN SCREW EYE OAR LOCK

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PUNCH SET IN FACE OPONE =| Bench Vise Makes Efficient Punch Press fol OTHER CLIP [E YOU have need to make neatly punched holes in brass, copper, or other light sheet metal, and haven’t a punch press available, your shop vise will do the trick. Bend two pieces of strap iron as shown to fit over the jaws of the vise. In the center of each clip drill a hole the size of the hole you wish to punch. Set a punch of hardened steel in one of the holes, making a fairly snug fit. The punch and hole will have to be perfectly in line—this can be done by placing a tiny ball-bearing between the clips at the center, and drawing up on the vise. The impression of the ball will then serve as a guide in drilling the holes. If this punch is to be used for heavy work, a good grade of steel should be used for both the punch and the die.—S., J. Brown. Large Potato Will Serve as a Gas Tank Cover E YOU ever should drive into a filling station for gas, and the attendant forgets to replace the gas tank cap, chances are a lot of gas will splash out before the cap can be replaced. A large potato will serve nicely for an emergency cap, for it only has to be pressed tightly down over the opening of the gas tank. Carry the potato along with your car tools if you will, or get one from some nearby potato patch whenever you happen to need it. This repair is only temporary, of course.—Roy J. Adams. Cutting Car Gaskets srg a GAS TANK j With Hammer i cyrus gaskets from sheets of paper or cork is never an easy job, and generally much fitting must be done before a good gasket can be obtained. Here’s a simple method by which the gasket can be cut exactly. Smear vaseline or hard oil over the metal to hold the sheet of gasket material down, punch ae | out the bolt holes and insert the bolts to prevent the -am sheet from moving. Now take an ordinary hammer or SS a wooden mallet and pound the edges of the metal to cut off the gasket to the exact size—Len Cooke. Compressed Air Cleans Clogged Radiator = iy ERE’S an effective remedy for that clogged radi- : Cilla ae ator. Drive to any service station, and while the ; W HOSE radiator cap is still in place, open the petcock at the bottom and quickly press the air hose against it, just as you would do with a tire valve. Let the pres- sure mount up to 30 or 35 pounds, repeating the operation several times. This shoots the water back- a a 2 wards all through the radiator, cleaning out any {RADIATOR St Ss clogged tubes. Be careful not to use excessive pres- DRAIN SERVICE sure, for it may blow apart the radiator seams.— AIR PRESSU Buzz Burton. APPLIED Handy Lifting Rings for Automobile Engines WEEN lifting engines out of boats or cars, it is some- times difficult to hook the hoisting hook on to the engine. Take an old spark plug, remove the porcelain core, and weld a steel ring to the upper part as shown. The lifting ring may then be screwed into the spark plug holes of the engine. For heavier engines two of these rings, one at each end, may be necessary for proper balance. A long quarter-inch bolt bent into a circle, with the threaded part extending through the plug base, and a nut screwed up tight beneath, will give the same results, where welding equipment is not available.—W. J. Brown. Modern Mechanix and

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Electric Bulb Dries Wet Hat Quickly HERS a handy tip for men who are caught in a rain without an umbrella, and come home with a hat full of water. Remove the shade from any electric light fixture which has a bulb in a vertical position, with the socket down. Shake off as much water as you can from the hat, and carefully press it back to its proper shape. Hang the hat over the bulb and turn on the light. The heat from the bulb will force all moisture from the hat—Maurice Lonn. Sugar Bin Screen Pulverizes Lumps GUSAR bought in bulk is very sensitive to moisture, and will harden into lumps whenever the air is a bit damp. By placing a quarter-inch mesh screen ledge at the rear of the sugar bin, any lumps found in the bin can be tossed on the ledge. Rubbing these lumps back and forth on the ledge soon breaks them up, and the pulver- ized sugar drops back into the bin. The above scheme can be used by merchants who buy sugar in bulk, or by the housewife who buys her sugar in 100 pound sacks. The screen can be soldered to the bin, or held with Le wooden cleats.—Lester P. Young. Punch Two Holes at Once in Condensed Milk Can | Deki OBATED milk is best taken from its can by making two holes, one for the milk to come out, and one for air to enter the can. Here is a little device that will make the two holes at once. A piece of quarter-inch steel stock is drilled out at each end, and sharpened steel spikes forced into the holes as shown in the sketch. If found necessary the spikes may be anchored by threading or hard soldering. A wood handle is fastened to the steel strip with stove bolts. In using, just place the opener on the can yr BLOCK OF WOOD and press.—Oscar Q. Fegas. a? FOR PRESSING LIGHT TURNED ON STRIP OF 4 INCH YX STEEL STOCK V SHARP SPIKES x Stone Jug Makes Effective Bumble-bee Trap UMBLE-BEES and hornets often make thcir home near farm homes, where they enjoy life much to the an- noyance of farm folk and live stock. A very simple jug- trap can be rigged up in a few minutes to catch these unwelcome visitors. A piece of newspaper is rolled into a tube to fit the mouth of a gallon stone jug, and a few drops of honey or syrup are placed within the tube. More honey is deposited in the jug, and the paper tube is inserted as shown. Bumble-bees will be immediately attracted by the sweet bait and enter the tube. Once they get through the tube into the jug, they will be unable to find their way out, and can be disposed of as desired. A couple of hours should be sufficient to trap an ordinary swarm of bumble-bees.—G. E. Hendrickson. : Glass Marbles Break Lumps in Salt Shaker N DAMP weather, salt will cake up over the holes in the top of the shaker, and will cake up into hard lumps inside. If a few common glass or porcelain marbles are placed with the salt inside the shaker they will stir up the salt con- tinually as the shaker is used, and keep it running freely SALT even in the dampest of weather, Different sizes and numbers SELLER of marbles can be used, according to the size of the shakers. SALT —A. H. Waychoff. MARBLES Inventions for February

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Ammonia Gun Easily Fastened to Flashlight THS combination of an ammonia gun with a powerful flashlight makes a weapon which will overcome any vicious dog or hold-up man. A rubber bulb about an inch in diameter is pressed onto a length of light copper or brass tubing, the end of the tubing being peined down to leave a nozzle opening about the size of a darning needle. Two bands of either sheet iron or spring brass are bent as shown to hold the ammonia tube tightly to the barrel of the flashlight. The tubing must be bent slightly so the rubber bulb will just clear the flashlight barrel. After the bulb is filled with ammonia, a slight pressure of the bulb will shoot a fine stream of ammonia a distance of about 30 feet. The flashlight beam gives perfect hits, for the ammonia stream will hit wherever the light beam is flashed. A. H. Waychoff. Pasteboard Cartons Make Fine Tent Floor TOURISTS who must pitch their tents each night have often wished for a tent floor which would not break through with the pressure of a heel, which would be clean, and which could be easily moved with the tent canvas. California campers have solved this problem very nicely by flattening out old pasteboard cartons, cutting them into sizes which can easily be folded and packed into a compact bundle. After the tent is pitched, these squares of paste- board are laid on the ground and covered with a square of canvas the size of the tent floor. This works even better than a linoleum floor, and weighs much less. In addition, the corrugated cardboard pieces form an insulating air f cushion en ens, any Canpniess in the earth from RIAAN getting into the tent. — Hi ae cme = Sibley. fica Handy Ice Fishing Outfit Holds Line and Hooks HE is a nifty ice fishing outfit which the handy man can build easily for only a few pennies. A- piece of maple 1” in diameter and 25 inches in length can be sawed from an old pitchfork or broom handle. Drill a com- partment for fishhooks and leaders in one end, and cut a wooden cap to cover this hole. If you have a lathe, you can do a neat job in a few minutes. Remove the handle from a small ice pick, being careful not to injure the ferrule. Taper the other end of the maple pole enough so the ferrule will fit snugly over it, and force the metal ice spike into it. Put on two screw hooks and the screw eye as shown.—Al Allard. Rustic Lawn or Camp Bench Has Springs Under Seat Gis COMFORTABLE rustic bench for your backyard ENES garden or lakeshore cottage can be made from ¥ a 1x12 pine or oak plank, a section of a twelve inch tree, and a few parts from that old standby, the Model T Ford. Get two front springs and remove all leaves but the lower one. Cut your seat plank just a bit longer than the springs, and fasten the springs to it as shown, keeping the springs about eight inches apart. : Almost any kind of log can be used for the ends of the seat. Cut notches in each end as shown in the sketch, and sink the logs a foot or two in the ground, spacing them so the seat plank will fit loosely be- tween the notches. With a chisel or gouge cut two slots about 8 inches apart in each support, wide enough and deep enough so the springs will slide cA j back and forth smoothly as weight is placed on the seat.—Bob Poulson. PASTBOARD CARTON CARTON A & FLATTENED OUT Fa COMPARTMENT ti] FOR FISH HOOKS SCREW HOOKS FROM MODEL T”FORDS f SET ABOUT 8 INCHES APART yii SLOTS CUT SCREWS ‘OOD 9? Modern Mechanix and

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Fine FUN With Simple GOBOGGAN z = Ale: Wi Steps to follow in building up your own toboggan are shown at right. i 2-Y.P BOARDS ; 7-6" LONG Richard K. , noted outdoor sports writer, designed this BOARDS TRUSSED A Poker pred pun trail P Forgan of the North. : a Soars ane oa HE toboggan is one of the favorite ve- -hicles of transportation in the Northern bush country. Whether drawn by hand or by sled dogs, the toboggan is indispensable for the trapper and the hunter who travels far back into the green timber, after. snow- fall. Boys who live in the Northland‘ use the toboggan for sport, as well as a means of conveyance. There is nothing quite so exhilarating as a toboggan ride down along sloping hill. Any man or boy familiar with the use of wood working tools can make his own toboggan. The one shown here is really easy to make, and yet the manufactured sort are not by any means inexpensive. Since the toboggan is almost invariably drawn over a snowshoe trail, it should not be wider than the snowshoe. Fourteen inches is about right. Two boards 8% inches wide and one inch thick will be required; the length should be 7% feet. The extra width is allowed for trim.ning FIGS. |q and shrinkage. If mill dressed boards are not procurable, select a straight grained i birch tree about fifteen inches in diameter, EMM, fell it and cut off a 7% foot section. Groove Ee both sides of the log, to insure a straight split, then hew an inch board from each half of the log, as near the bark side as possible. Avoid flaws and streaks of red DETAL THRU END 1 IFWOOD SCREWS COUNTERSUNK should be planed perfectly smooth, for the bottom, then the edges dressed and the top of the boards planed down to a thickness of % inch, except the thickness should be À 4⁄4 inch where the bend will come in front. s-S38./ 31 N SANDPAPER BOTTOM SIDE, THEN 5 EME WITH HOT PINE T (Continued on page 120) Inventions for February 93

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Burglar Alarm for Country Stores Rings Bell in Home Strips of stiff music wire above a metal plate in the floor are bent down when anyone steps near the cash register, closing a circuit to an alarm bell and bat- tery which may be either in the home or the store. Moulding Makes Darkroom Shelf HANDY shelf for safe-light glasses used continually in the darkroom can be made from a few scrap pieces of L-shaped moulding. For the ordinary 5”x7” safe-light glass cut two 5” pieces of moulding and nail them to the under side of any convenient shelf. Glass may easily be slipped into this shelf, keeping it off the bench where it may be broken. Separate shelves may be made for each color of glass if desired. Old glass camera plates can also be stored in this manner. Tiers of shelves can be made by nailing the L-shaped strips on top of each other. L-shaped moulding tacked to the under side of a shelf as shown makes convenient pockets for safe-light glasses foc the darkroom lamp, and for glass camera plates. 94 SIMPLE burglar alarm that will operate whenever anyone steps near the cash register can easily be set up in the country store that is located some distance from the home. An area about 4%” deep is cut out of the floor directly in front of the cash drawer, and a metal contact plate tacked down. Stiff music wire is fastened above the plate, taking care that all pieces of wire are connected together. The wires are bent so they are level with the floor, and do not touch the plate. Leads are brought through the floor from the wire and the plate, and two wires run to the house where they connect to a bell, battery or transformer, and switch. A rug or rubber mat is placed over the wires in the floor. Whenever anyone steps on the mat, the music wire will be pressed down until it makes contact with the metal plate, and the bell circuit will be closed. Store lights can then be turned on when the alarm bell rings. Spiral Wire Keeps Chimney Clean A spiral of wire extending from top to bottom of chimney and driven by propeller vanes at the top, gives continuous removal of soot in chimney, and insures constant draft. GRAND RAPIDS, Michigan, inventor has devised an apparatus which insures a continuous draft in the chimney flue, and ‘constantly removes soot from the chimney. A quarter-inch wire wound.in corkscrew fashion, and extending the entire length of the chimney, is driven by a propeller-like fan turning in the wind above the chimney. The rotating blades continually suck air and soot up the chimney. Modern Mechanix and

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How to Hook Additional Speakers to the New Radios N VOICE COIL ‘A LTHOUGH most new radio sets have dynamic speakers, it is still possible to hook up magnetic speakers in parallel with the set, when it is desired to hear the radio in a number of isolated rooms. TOMAGNETIC SPEAKER LEADS FROM FORO f SPARK COIL Take apart a Ford T spark coil, being careful not to damage the leads to the coils. Mount the coil and core in a small wood or metal box, and connect the coil leads to binding posts mounted on the top. of the box. Mark the posts going to the coil having large wire “PRI” and those connected to the very fine wire “SEC”. Mount the box in or near the set, and run two wires from the “PRI” posts to the dynamic speaker, soldering them to the voice coil leads (the coil mounted on the speaker diaphragm). Wires may then be OLUME CON— DYNAMIC ROL IF USED SPEAKER run from the “SEC” posts to from one to three speakers in different parts of the house. : The volume of the extra speaker may be controlled by connecting a variable resis- tor 1000 ohms or larger in size across the magnetic speaker terminals. f Ford Magneto Terminals Make Good Insulators MAcNETo terminals from the old model T Ford may be used to advantage as stand-off insulators by short wave enthusiasts. Remove all dirt and grease with gasoline. When using them to bring an aerial wire through a wall drill a hole the size of the terminal base, and bolt two terminals together as shown, one on each side of the wall. The terminals are more than strong enough for this purpose, and have very high insulating qualities. Hard Rubber Toothpaste Caps Make Improvised Radio Set Dials THE hard rubber caps found on tubes of tooth paste may easily be converted into small radio knobs such as are used for switches and volume controls. File rough notches in the shaft on which the knob is to be fitted. Fill the tooth paste cap with a good grade of cement, wood filler, or glue, and press it firmly over the shaft. Wipe off any excess cement and allow to dry. The many-colored hard rubber caps now being used on perfume and hair tonic bottles may also be used in this manner where somewhat larger dials are needed. CONDENSER LEADS: FORD MAG- NETO TERMINAL Storage Battery Makes Transmitting Condenser AX OLD storage battery may be converted into a good high voltage transmitting condenser for that ham set. First drain the battery of acid. Wash well with hot water to clean out all acid and sediment at the bottom of the plates. Flushing with a hose will do the job nicely, or even better—let the water stand in the battery for a day or so. : Cut away the heavy lead straps connecting the three cells. Connect all positive plates together and all negative plates together by soldering in short wire leads as shown in the sketch. The two resulting terminals are the condenser connections. Now fill all three cells with transformer oil such as can be obtained from your local power company, covering the plates about % inch. This condenser will stand up to 1000 volts or more, depending upon the internal condition of the plates, and will have a high current capacity. f CONNECT ALL f CONNECT H TRANSFORM- ER OIL CUT AWAY LEAD CONNECTORS Inventions for February 95

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Shielded Antenna Lead-in Helps Reduce Electrical Noises RENTTO co HE modern antenna is one which will FREQUENCY COIL ara de ge, hee ene reduce or cut out disturbances produced : i by nearby electrical apparatus. It is not difficult to rig up, requiring only a shielded léad-in wire and two ordinary shielded radio frequency coils. Get two r.f. coils of the size suited for .00035 tuning. Connect plate and grid windings of one together to form a tap connec- tion for the lead-in wire, and ground the remaining plate coil lead to the shield and to the radio set ground. The grid coil lead is insulated and connected to the antenna post of the radio set. The second r.f. coil is mounted on the antenna post near the point where the lead-in connection is made. Grid and = | l SHIELDED i l | | plate coils are connected together as before to make a tap for | | l l t L LEAD —IN a SHIELDED the lead-in connection. The insulated grid lead is connected CO EEN to the antenna, and the plate lead is grounded to the coil shield l and the lead-in shield. 4 | It may be necessary to drill a hole in the can of the coil J nearest the radio set, and attach a metal terminal for the ground connection. Care should be taken that the shield of the lead-in wire is securely grounded to the metal cans at each end, and that the wire itself does not touch the shield at any point. The antenna is now ready for use. Electrical disturbances and all static noises lower than the radio frequencies will be passed off to the ground by the coils, and only the radio frequency signals of the broadcasting station will reach the set. an t “| = ANTENNA GROUND ON SET ON SET Handy Wire Stripper Made From Clock Spring TASUTA TION may be easily and quickly stripped from all kinds and sizes of insulated wire with this handy wire stripper. Make the handle by cutting off a four inch length from a broom handle and flattening two opposite sides. Get two pieces of heavy clock spring, each about four inches long. Heat them to a cherry red and allow to cool slowly. Drill two holes through one end of each, and bend the other ends at right angles as shown. Grind the ends to a knife-like edge, reheat, and plunge in oil to regain the temper. Sharpen the cutting edges on an oil stone, and fasten the springs to the handle as shown. 3 Ford Magneto Ribbon Makes Efficient Antenna THE copper ribbon found on model T Ford magnetos will make an antenna which will stand up in any ice storm, and which will add plenty of distant stations to your DX list. One magneto contains about 175 feet of around No. Z2 gauge, 3/16” wide copper ribbon, in 16 pieces, each a little less than 11 feet long. Clean the ends of the ribbon, bend as shown in the sketch, and dip in rosin flux or any good non-corrosive soldering paste. Hook the ends together, and run solder freely over the entire joint. The result is a joint almost as strong as the wire tape itself. Amplifier Increases Volume of Phonograph Pick-up ISAPPOINTING results are often ob- G tained when a phonograph pick-up is used with some of the smaller A.C. radios, principally because these sets have only one stage of audio-frequency amplification. The one-stage amplifier circuit shown here will boost up the volume to the desired level. The detector tube of the radio set is re- CURTAIN ROLLER HANDLE PS LOW FREELY END: JOINT LIKE THIS AUDIO FREQUENCY TRANSFORMER moved from its socket, the amplifier plate lead is connected to the plate terminal of the socket, and the 199 tube filament is grounded: The parts necessary are: a 3 to audio frequency transformer; 500,000 ohm volume control; UX 199 tube and 96 socket; 30 ohm filament resistor; 4% volt C battery for filament supply; 45 volt B battery for plate supply; 1 mfd. fixed con- denser; and a 30 henry filter choke—an old audio transformer primary will do. A higher B battery voltage may be used. Modern Mechanix and

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Easily Made Jig for Winding Radio Coils on Tube Bases A SMALT winding arber which can be rigged up in a few minutes to fit in a breast drill will enable you to wind short wave coils on tube bases in but a fraction of the time required to de the job by hand, Turn down one end of a five inch steel or hardwood spindle to a size which will fit in an ordinary breast drill. The other end can be tapered out to about twice this thick- ness, and should be drilled and tapped to take a machine screw. A bakelite tube socket having a center hole is fastened to the thick end of the spindle with a machine screw, as shown. With the tube base in position in the socket, it is a simple matter to put the spin- dle in the chuck and fasten the breast drill in.a vise. The wire is fed and guided with oe hand while the drill is turned with the other. : Handy Reel for Electric Cord E MAKE a portable reel for that extension cord, bend a piece of %” iron rod as shown, to form the stand. Bore a hole in one end of the spool, fit in a small base re- ceptacle, and connect one end of the exten- sion cord to the receptacle. Wind the cord on the reel, and attach an ordinary lamp socket. Spool of wire should be mounted to turn freely to avoid kinks. Handy portable reel pays out any length of extension cord. MACHINE SCREW TAPERED TO FIT _ INDRILL CHUCK TUBE BASE HOLEIN SPINDLE A | A7 BAKELITE TUBE SOCKET 5” spindle tapped at oP he one end for a machine screw is tapered down to fit in a breast drill chuck. Tube socket is fastened to end of spindle. Tube base coils are pushed in socket for winding. Burning Insulation From Wire OR transmitters up to 25 watts, heavy copper wire may be used in place of copper tubing for inductance coils. No. 8 to 12 insulated wire may be used by coiling it up and burning insulation off in a fire. Remove wire from fire and immerse in cold water to soften. Polish wire, straighten, wind coil, and paint with transparent Duco. Increase Magnetic Speaker Volume HE output power of an ordinary mag- netic speaker may be increased about one-third by adding D. C. magnetizing coils to increase the strength of the permanent magnet. ; Carefully disassemble the speaker, and remove the large permanent magnet. Make two cardboard or gummed paper winding forms about one inch long, that will just slip over the magnet poles. Wind about 325 turns of No. 22 D. C. C. copper wire on each form, place windings on magnet, and con- nect each coil in turn to a 6-volt battery. With compass in front of a pole, needle should not deflect when current in that mag- net coil is turned on. When correct coil connections are found, connect coils in series across a 6-volt battery, and replace magnet in speaker. Magnetic flux of coil then aids permanent magnet. Lathe on Folding Table Top Is Big Help to Home Electrician, Radio Man THE table top workshop shown to the right is an enormously handy thing for the man who builds radios or who likes to tinker with small metal parts such as boat engines, etc., in his spare time. The table is a complete workshop, and can be installed in a bedroom to look like an ordinary piece of furniture. It consists of an ordinary four-legged table with a bot- tom and a top shelf. Instead of the bottom being on slides, it is permanently fastened to the legs, and the top on which the lathe and vise are installed so that they can slide up. See photo. : A grindstone,,a small vise, hammer, nails and small bench tools are carried below. Inventions for February Handy metal-working shop can be set up in bedroom, where it is particularly handy at radio and light machine work. 97

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Radio Gets All Waves in One Set, Has Novel Features This shows the unique wave band selector switch and tuning dial; Lower knob switches into any one of five broadcast fields and upper knob does the tuning. The compact external panel is one of the features with which this new radio set bristles. At the top is a picture showing this compact 16-tube outfit, and at the bottom is a diagrammatic view of the chassis from the lower side, outlining placement of parts. P HIS is news: manufacturers usually send to this magazine merely photos of their products. Not so the makers of the Midwest All-wave 16 and 9 tube radios. They send their product, which speaks eloquently. Much to-do has been about in radio cir- cles lately concerning combination all-wave sets. As a rule they are quite expensive. So naturally Modern Mechanix and Inventions staff were anxious to see what could be done by this new inexpensive arrival, quite en in form from the usual contribu- ion. Imagine the surprise of all concerned when the first station to be picked up was that of the liner Majestic in mid-Atlantic— station GFWV! This was without an aerial, as the set was trundled to the nearest desk and attached to an improvised counterpoise! Subsequent tests have proved amazing range, splendid receptivity and tone, and razor sharp tuning. The set is designed to run on alternating current of 105 to 120 volts, 60 cycle. The chassis rests on four rubber feet which have a tendency to damp out vibrations and microphonic noises. The control board face is extremely sim- ple, and the multiple function of the wave 98 This shows the wave band switch which is so compactly designed as to take up very little space in the unique 16-tube all-wave radio. band selector switch accounts for this. By an ingenious mechanical arrangement five different circuits are tapped through the one switch. Tuning is done on one dial, and is very critical. There is a small pilot light behind the dial which illuminates the outline of the indicator on the wave band selector switch, and at the same time dias- copically allows the numbers on the tuning dial to be easily read. The set has a phone jack also. so that headphones can be used. The set is a joy to tune, as it has an automatic volume con- trol which drowns out the noise level of local stations and swells weaker signals to normal strength. This most unique and ver- satile set is not expensive. It is sold by Mid- west Radio Corp., Cincinnati, Ohio. Modern Mechanix and

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Ghis WEE STEAM ENGINE 4 ‘p aS: F è TP TACH. STEEL {Are E E LACH. STEEL £ 8 nn x ZIK a a Any kind of a boiler from a pot type to a flash steam plant will sun this elegant little design by a student of the Cornell Engineering College. The pattern work is just elaborate enough to be interesting, simple enough to be fun. Much of the manner of execution, such as thread sizes, materials, and so on, is left to the ingenuity of the model builder. by N. A. WELCH UNDREDS have asked for small engine plans. This wee fellow is no toy, and should satisfy those who want an engine for a shop project, to power a model boat or “just to run.” It has been planned to fill this need rather than as an efficient or as a revolu- tionary machine. Many of the details are left to the build- er such as thread sizes, finish of parts and so forth. It is extremely sturdy and will stand lots of hard use. It is constructed entirely of brass with few exceptions. We will go now to the details of construction. The base or'stand is a brass casting. The pattern can be made from whitewood, white pine, boxwood or mahogany. No allowance is left for shrinkage, but plenty, about one sixteenth (1/16) of an inch, is left on the surfaces to be machined for cuts. The reason why no allowance is made for shrinkage is because the casting Inventions for February is so small that the shrinkage will be negli- gible. The drawing gives the dimensions of the finished part, so this must be borne in mind when the patterns are made. Wax Used in Castings It is suggested that wax fillets be used on all the angles as these are the easiest to apply to small patterns and stand up very well, especially when only one or two castings are to be made. This process is done by first grinding a rod to the re- quired spherical radius, that is the radius of the end equals the radius of the fillet. Heat the rod in a flame and press the wax into the angles. The machining of this piece can be ac- complished in one of two ways. In either case the main bearing hole and the vari- ous holes in the cylinder bearing face must be laid off as per drawing. The best way to do the machining is to bolt the base to a milling attachment’ for the lathe, base down, after first filing the base flat. Then the holes may be drilled by putting a chuck on the headstock to hold (Continued on page 124) 99

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BUILDING a NOVEL An efficient iceboat that will show good speed with little exposed driving area can be built from these plans by Dick Cole. fH ROTORS REVOLVING VACUUM POCKET IS CREATED Y CLOCKWISE + IN FRONT OF REVOLVING H ROTOR CYLINDERS TOP OF PIPE SHAFT SPLIT TO RECEIVE OARS SPECIAL DIRECTION OF WIND The diagram above explains the rotor driving principle. One can sail into the wind on a fairly sharp tack, but must employ a reversing gear to spin the rotors in opposite rotation in order to tack back the same way. ERE is something which will tickle the fancy of the ultra-modern experimen- ter who delights to delve into unplumbed depths—a rotor iceboat. Readers of this magazine will have read of the rotor ship built in Germany several years ago. While the principle of operation of this ship was scientifically sound—as proved by practi- cal experiments—commercially, it was a complete flop. No “wind-jammer” of any kind can possibly oust the steamship and the modern motor-ship from the salty waves. Might as well expect domestic zebras to restore the popularity of equine-drawn vehicles. Nevertheless the German rotor ship did function mechanically as intend- ed, albeit was dependent for its actual propelling power upon the wind, just as much so as an old “Yankee clipper.” But it did move through the water by “rotor ROTOR IS TRUED 39 s : UP AND MADE RIGID power application, was maneuverable, BY ADJUSTING EYE” and it cruised. If “rotor power” can move a cumbersome hulk through the water, ? ` how much more readily can it propel a The rotors ave no more difficult to build than big box : enge . kites, and are fabricated from veneer, old pipe fittings, practically frictionless iceboat over, the wire stays and doped muslin to give the barrel effect. shimmering ice! And so we have it in 100 l Modern Mechanix and

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“Rotor JCEBOAT Ss? Sree on our drawings here. A freaky-looking craft —suggests the sky-line of Pitisburgh—but the “derned” thing runs—that is, slides. You ask: “What is this ‘rotor power,’ anyway?” The drawing illustrates the prin- ciple, and shows its application to the iceboat. Here’s the dope: when a current of air—wind—strikes against a revolving cylindrical surface, the air is diverted in the direction of revolution. However, it does not cling to thé surface, but is thrown off at a tangent, creating a vacuous pocket in front of the cylinder. Obviously the cylinder tends to move into the vacuous space, and pulls with it the body to which it is attached. A simple rule decides the direction of the force. When the cylinder revolves clock-wise, let the index finger of the right hand indicate direction of wind. Now spread out the thumb at right angle to index finger. It shows the direction of force. With a counter-clockwise revolving cylinder use the left hand. | ¢-——— ZX 6" FACED WITH ANGLE IRON BICYCLE FRAME REVERSE LEVER (SEE DETAIL) LIRON PIPE 2 WITH ENDS FLATTENED Bro" 1 i} | | JI ki | f i \ HOW stay-RoD ||| IS SECURED TO ||| FRAME BRAKE LEVER ROTOR (SEE DETAIL) aa, REVERSE f| LEVER SECTION r— 12” — — THROUGH A-—-A wee ELS DRIVE, SHAFT (spire) METHOD OF SECURING BICYCLE FRAME TO 2X4” EXTENSION STAY-ROD SUPPORTS BICYCLE ANGLE IRON BRACING Izo” i RUNNERS DISH OUTWARD ROTOR SCREW EYE STEERING CABLE FORGED FROM OLD SPRING LEAF ' CABLE TO BRAKE LEVER os REAR RUNNER aa sk Sp ee eMM ee a as- 2X4" FITTED WITH j The disposition of the rotors, the size of the iceboat, and the driving details are shown in the drawings above. There is another detail drawing which shows the reverse mechanism used on opposite tacks. Inventions for February Note construction of the brake. 101

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: s From the foregoing one will have learned Reverse and Pedaling Machinery what “rotor power” is all about. Now we will apply it to the iceboat. Let it be said right now that the amateur builder need not “shy” at the construction; it is not at all complicated nor is it costly. A bicycle is temporarily requisitioned to provide the motive power; the shafting, for the most part, is. 14” pipe (second-hand, at that); the bevel gears can be bought at any auto wrecking yard for “six bits”; the rotors are a skeleton frame-work covered with mus- lin, and “doped”. A few miscellaneous pipe fittings complete the list of material. From the plan and elevations the builder can readily construct the frame, and can mount the bicycle—sans wheels—on the projecting right front end of the frame. It will be seen that the drive shaft, with its supporting cross members, is built up as a separate assembly, and afterward slipped up between the 2 by 4’s of the main frame and secured with %” lag-screws. All the bevel gears on the drive-shaft are “spider” gears from old differentials. The gears are bored out so that they are a light driving fit on the %” pipe which serves as the shaft. Their mating gears are on the vertical shafts of the rotors. Before permanently pinning any of the gears to the shaft, it is well to try them out and determine their actual pitch line first. The brake is incorporated into the main frame assembly, and should be built into the frame at this time. Its construction and operation is so simple that it needs no elaboration: The drawing shows the simple clip which serves as the fulcrum for the brake lever. i WIRE STEERING CABLE DETAIL OF REAR RUNNER F COACH BOLTS Za RUNNER IS SLIGHTLY ROCKER SHAPED. SPECIAL WASHERS I e SLOT IN BOTTOM FITS OVER STEEL RUNNER BLOCKS BOLTED TO SIDE OF RUNNER SLEEVE SLIDES CN SET SCREW PLATES CLAMPIN: HORIZONTAL FOR ————— EA COLD ROLLED pee x 3 ai z i b > iN 1 ROD WITH ROUND A 3 = | END a> \ ZTS EE up = = The top drawing shows the construction of the steering runner. Rudder post is riveted directly to runner blade. Details below show construction of reversing mechanism, nes ae which is extremely simple and easy to build and should deter no one from building this big dollar’s worth of fun. 102 Modern Mechanix and

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We will now take up the construction of the runners for the iceboat. One drawing shows the front runners. The runner body proper is cut from a piece of selected maple or oak 1’x6"x36”". A 2” groove 3/16” wide is cut on the lower edge of the runner. This can be readily done on a circular saw. Again one visits the auto junkman and obtains three old spring leaves 3/16”x2%” and over 40” long. Any blacksmith can quickly forge these as shown in the insert drawing. Also drill the holes and then re- temper. Note particularly that the runners are dished outward 1”. This adds strength to the construction and brings a keen edge in contact with the ice to prevent side slipping. The runners are secured to the cross-member of the frame with 5/16” lag- screws, and still further re-inforced with a %” angle-plate underneath. Rudder Runner Now we come to the rear runner, which, of course, serves as rudder. For the most part, the construction parallels that of the front runners. However, the body is cut from 1%” stock and the steel runner is slightly “rockered” to facilitate steering. Note the sectional conical blocks bolted to the sides of the runner. These are to give a greater surface for the swivel washers. The rear elevation shows clearly how a 3⁄4” floor flange and 4” nipple serve as a housing for the %” rudder shaft. Note de- tail of rudder shaft. Note how the notch in the bottom rivets over the steel runner assuring rigidity. An essential point in the rear runner construction is that the point of contact with the ice is back of the center- line of the rudder shaft. Now for the rotors themselves! The drawings present the construction so clear- ly that little need be said in addition. Particular attention is called to the ball (or roller) bearings at the top of the drive-shaft housing. The housing itself is a 24” length of 2” pipe held in a floor flange. A 2” union at the top is machined out to receive a front wheel bearing from a junked car (page the junkman again). Note the special flanges, which secure the rotor disk to the drive shaft. These can be cut out with saw, chisel, and file. The holes are cut out of the plyboard disk solely to lighten rotor. Rotor Covering Also depicted are reinforcement angle brackets and the eye-bolts with which the stay-wires are adjusted. The frame is ac- curately trued up before the muslin cover- ing is put on. Unbleached muslin is the covering. After being stretched on it is sprayed with water. Upon drying out it will shrink “as tight as a drum.” It is then sprayed with airplane dope or lacquer. A finishing coat of aluminum paint enhances the appearance. Now we come to a very essential factor in the construction: means of reversing the direction of revolution of the rotors. This is as essential as swinging the boom of a Inventions for February Details of Runner Bracing ANGLE IRON REINFORCEMENT CROSS MEMBERIS 2x 6"% 12'O" SELECTED PINE STEEL RUNNER IS FORGED FROM OLD £ AUTO SPRING LEAF DETAIL OF FRONT RUNNER EDGE HOLLOW GROUND The method of bracing the’ front and side runners, as well as construction of the blade itself is shown here. sail to catch the wind at the proper angle. In fact it serves a similar purpose. The details of the reversing gear are fully shown. It will be seen to be the acme of simplicity. First note how the original chain and rear sprocket of the bicycle are re-located to drive the cross-shaft. If the original bike sprocket is used it will prob- ably have to be welded or brazed to the end of cross-shaft. However, any of the “stock gear” manufacturers make sprock- ets with a hub which can be pinned or keyed to the shaft. Note how old front wheel bearings (page Ikey again) support the cross-shaft. Not only do these provide frictionless bearings, but they take up the thrust of the bevel gears as well. It will be seen that the driving gears of the reverse gear are brazed to a sleeve which is free to slide upon the drive shaft. A hardened %” pin screwed in the shaft engages a U slot in the sleeve. To reverse the gears, the pilot momentarily back-ped- als on the bicycle. This throws the pin out of the slot parallel with the circumference of the sleeve. With the reverse Jevel, within convenient reach of the pilot, the gear sleeve is moved so that the pin engages in opposite slot. Simple? What! There’s your rotor iceboat. Now go it. All you need is a fairly smooth ice surface and a 15, or more, mile an hour wind. Obviously one needs a cross wind, but, nevertheless, the rotor iceboat can be brought “close into the wind” the same as any wind-jammer. The pilot will quickly learn the peculiarities of rotor sailing from experience. It requires very little muscular effort to maintain the rotation of the rotors. They should revolve 200, or more, revs. per minute. 103

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‘Build This Scale codel of Direct from the Goodyear Zeppelin Cor- poration come these accurate scale model plans for the world’s largest dirigible air- ship, the Navy’s U. S. S. Macon. by J. EARLE MILLER A view of the completed modei, as it is supported on the mantel by its por- table mooring mast, by the bumper under the lower vertical ‘URN fin, and by a length of bus wire. TO GREATEST hem DIAMETER OF HULL ERE they are—scaled plans for a dandy model of the pride of our Navy, the U.S.S. Macon. Eighteen inches long she’ll be, with mooring mast, control cab ’n every- thing, and she’ll look swell in her glistening coat of aluminum, sitting up there on the mantel. The hull of the Macon is turned from a block of hard wood, first to its largest diameter of 3.188”, and then down to the correct diameter at each station, as shown on the drawings. All dimensions are given > decimal fractions ai an ineh, to eee Se e scale reduction. ” steel scale gradu- PSAPRELIMINARY ated in hundredths of an inch should be ZA “suapine used in laying out the hull. All fins are carved from wood to the TURN TO CORREC DIAMETER AT CH ON -7 E R Danis : : RK hs “ Control cab is carved from a block of wood 12''x%'’x1 1⁄4”. ON CYLINDRICAL % ae A : Section B-B shows how the bumper is formed below the BLOCK... -aa -- ; = > 3 A cab. Windows are recessed by using knife and small chisel. 1. eS | DETAIL OF oe ; 0.388" 0.291" be 0.292” > CONTROL CAR 0.356 rite tole 0.321"->| A B C rai i CURVE i ' N i | l TOF HULLE ‘ RECESS 2 [WITH KNIFE | A È 770" ori DIAM. OF HULL | cee DETAIL AT STATION | OF LETTERING SEE DETAIL SEE DETAIL OF INSIGNIA STATIONS SEE DETAILOF| INSIGNIA ON RADIATORS BOTTOM OF SHIP SEE DETAIL OF #—— LOWER FIN SEE DETAIL OF ALL DIMENSIONS IN HUNOREOTHS SEE DETAIL OF CONTROL CAR AND THOUSANOTHS OF A OUTRIGGERS BUMPER’ 104 : Modern Mechanix and

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the “Dirigible U. S. S. Macon DROP BEAD OF SOLDER ON PIN HEAD AND TRIM FILE T POINT HERE Details of the eight propeller outriggers. Solder is used to obtain streamlined effects for the struts. The full size Pattern of the navy insignia and lettering gives the color scheme to be followed. Radiators are outlined in the hull by cutting notches with a knife. Lower vertical fin is cut as indicated by heavy line in full size pattern at right; other three fins according to dotted lines. Mooring mast is of radio bus wire. size of the full size pattern shown. The bottom vertical fin is different from the other three, in that it has a control car in its leading edge, and a bumper beneath to rotect it when the ship is on the ground. Vindows’ in its leading edge are cut into the fin with a knife and small chisel, and painted with white paint to which a small amount of blue has been added to give the bluish tint of glass. Hollow out slightly the edges to be glued to the hull, then glue them in place, using small brads if neces- sary. The control car is carved from wood to the dimensions shown, windows are cut in and painted, and it is glued in place. Since the Macon’s eight Maybach engines are mounted inside the hull, only the out- riggers on the eight propellers need be made. Drive shafts from each engine lead to swiveling balls containing bevel gears to which the propellers are attached. The streamlined drive shaft housing can be formed from light brass or copper sheet cut to the contour shown in the sketch. Solder is made to flow over both sides of the flat housing strip until the desired streamlined shape is obtained. A file can be used to trim the solder where necessary. The housing is made 14” longer than shown, the extra length being driven into a slot in the hull. The braces which support each drive shaft are cut from sections of small com- mon pins, driving the pointed end into the hull and soldering the other end to the shaft housing. (Continued on page 118) Inventions for February TO BALL WITH FILE FULL SIZE j / PATTERN OF |SOLDER a INSIGNIA & Aia WHITE cv LETTERING | o. a p + EXACT->| ` 7 : d \ SPACING ES) ore: B amy B A Futt SIZE 4 PATTERN Y OF THE FINS FILE TO FIT HULL REMAINING 3 FINS THUS SecTION B-B BALL OF SOLDER HOLLOWED OUT, 5 S o 2 DETAILS ÒF THE TRIANGULAR MOORING - MAST 105

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Self-Switching Sidetracks for Electric Trains “CROSSING GATES BRIDGE e diiin TUNNEL: i i ~ il i $ l EXCEPT FOR THE SIDING TRACK j ALL ACCESSORIES ARE STANDARD EQUIPMENT OF MANUFACTURERS j U es STATION p a TRAIN ON SIDING 4 WHILE PASSENGER TRAIN i GOES THRU ON MAIN LINE NOTE CROSS TIES CAN BE MADE OF SLOTTED WOOD AND FOLDED 24 GAUGE SHEET METAL FOR RAILS, MAKE LENGTH OF SIDING TRACK TO SUIT. ARM ON OBSERVATION CAR HITS LEVER NO.4. AND CLOSES CIRCUIT TO THIRD RAIL CF SIDING — FREIGHT TRAIN PROCEEDS LEVER NO.3, OPENS THE CIRCUIT TOTHIRD RAIL OF fs SIDING AND STOPS PROJECTING ARM OF FREIGHT ENGINE SIMILAR ARM PROJECTS ON LEFT SIDE OF OBSERVATION PLATFORM OF PASSENGER TRAIN Left top view shows layout of track used with two trains, one is a freight and the other a passenger. By the construction of the switch system shown the freight train goes on the siding, shuts off its own current, opens the switch for the passenger train which goes through on main line. There is a control on last Pullman which starts up freight train to follow. YLECTRIC trains with their oval tracks ‘soon become boring. After you have watched them go around in one direction, about the only other pastime is to see them go around in another direction. But here’s an ingenious automatic side track suggested by M-M’s own Dick Cole, the daddy of how- te-build writers. This Cole side track allows you to run two trains on the same track, just like a big railroad. Freight and Passenger Trains The siding can be built at home, too. Wooden ties and 24-gauge rails home made will do the thing nicely. A freight train goes on the siding ahead of a passenger train, which is following it around the track. The freight turns off its own cur- rent, closes the switch and opens the main line track. The passenger comes through the main line while the freight is dead on the siding. On the last Pullman there is a control which opens the side track switch and turns on the juice for the freight. The 106 freight follows the passenger out and the two- trains make the circuit. This time the passenger is shunted, and the process is kept up automatically. How to Do It With very little alteration the standard switches supplied by the makers of the trains can be re-designed to suit the pur- pose. Or the ingenious man or boy can make switches and siding by using 12x1- inch ties and folded 24-gauge galvanized iron rails. The circuits and the method of making the track and switchpoints is shown in the drawings at the top of the page. The link bars are of 1/16 inch brass. A spacing of about two inches would be about right for the ties. Some copper of half hard variety would do for the contacts of the switches, Possibly some smart merchant will ap- propriate this idea. It is a natural for win- dow displays! Modern Mechanix and

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Tiny Electric Car Runs 12 m. p. h. on ©rack CONCRETE This tiny electric car driven by an ordinary 110-volt a.c. motor spins around its 20 fe. diameter: concrete track at a speed of 12 m.p.h. Power wires run through the iron pipe. THS tiny electric car constructed by Woodrow McCrate of Black, Texas, spins merrily around on its 65 foot concrete race track at speeds of up to twelve miles per hour. It has made a decided hit with the little tots of this Texas town. Power from the regular house lighting circuit is used to run the car. An ordinary % hp., 110 volt a.c. motor is mounted in the rear of the toy automobile, and connect- ed to the rear axle through speed-reducing gears. An iron pipe pivoted about the center of the track keeps the car running on its circular course, and also serves as a means for bringing the electric power wires to the car. Brushes mounted on a piece of wood: fastened to the pipe make contact with two circular brass strips, springs be- ing used to keep the brushes in contact with the stationary rings. The brass strips are mounted on a wood block which is in turn set in concrete. Power wires are run underground in a 34” pipe from the power source to the brush rings. The tracks on which the car runs are made of concrete, and are 6” wide by 6” thick. The two circular tracks of concrete are 18” apart center to center, and 20’ 6” in diameter. The track was made by pouring cement in a trench of the correct size, the finished track being level with the surrounding ground. Although this car was made for a two year old child, it will easily pull children up to five years of age at speeds of up to 12 m.p.h. This is sufficiently fast for a circle of this size. Inventions for February BALL RACE WIRES FROM POWER SOURCE, THROUGH 34 PIPE TRACK MADE BY POURING CONCRETE IN TRENCH Above sketches show details of concrete race-track, and method of running house lighting current to 1⁄4 h.p- motor in rear of car. Concrete tracks are level with ground. Below is a view of the electric car with its tiny driver. Rubber Pad Keeps Pans From Wall OTS, frying pans, and other cooking utensils which are hung from hooks often scar the walls and leave grease marks. Rubber pads made from dis- carded inner tubes and hung from the hooks by strings will provide cush- ions for the pans. The pads may be cut into Rubber pads hung from hooks fancy shapes by string keep kitchen utensils such as triangles, from scarring walls. Pad is ad- shamrocks, OT justed to hang at point where the pan would touch the wall. 107 hearts if desired.

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“Daylight “Developing ‘oank by L. C. PELTIER Now that panchromatic plates and film have generally come into use, most developing is done by the time and temperature method which involves a long and tedious vigil in a darkroom unless a simple developing tank like this one is used. Made from a varnish can, this developing tank will perform all functions in broad daylight if accompanying instructions are followed. T entire equipment necessary for de- veloping, fixing and washing photo- graphic negatives can be constructed from half of a one- fe allon varnish can, together with a few other odds and ends of scrap material. Since panchromatic plates and films have come into common use, developing is gen- erally done by the “time and temperature” method. This is usually done in total dark- ness, using three or more trays or tanks containing separate solutions of developer, water and hypo. Obviously there are many disadvantages to this method but with the one-tank system to be described these may all be eliminated. Tank Will Hold Twelve Films A long tedious vigil in a stuffy dark room is no longer required. Instead, the plates or films are transferred from the plate-hold- ers to the tank in a dark-room or changing bag, the cover placed on the tank, and the remaining operations may all be done in broad daylight. The tank shown was designed to accom- modate twelve cut films of size 3% by 4%. For use with plates or films of other sizes some of the dimensions will, of course, have to be varied accordingly. The average one-gallon varnish or paint can has a base measuring about 4 by 6 inch- es. The can should be sawed in two at a height of 5% in. which allows a 3/16” edge to be turned over on the inside. Most cans of this type have a raised bottom, 3/16” this case, and solder should be run into the slight channel which this makes on the inside to provide a fairly smooth floor for the tank. The inlet and outlet connections may be made from any light gauge tubing; in this instance they were sawed from an old pair 108 of bicycle handlebars. Whatever. is used should have an inside diameter large enough to permit the tank to be quickly filed and emptied. With a sharpened screwdriver and round file, holes are made in one corner of the tank and the connec- tions inserted and soldered flush with the inner surface. An ordinary cork can be used to close the drain outlet but as the inlet pipe must be filled nearly to the top a screw-on cap should be used here and it will be found. that the cap and neck cut from an old furniture polish can or similar receptacle can be easily soldered onto the inlet pipe, making a neat and well-fitting cap. Solutions Circulate Freely Some means must be provided which will permit the free circulation of the solutions and still prevent the passage of light. This is accomplished by a number of overlap- ping leaves or shutters of light gauge metal arranged as shown. The leaves are soldered to the tank and to the partition before the latter is put into place. Slant the leaves as shown to insure the complete drainage of the solutions. Cut the opening in the par- tition and solder into place. Some form of protective coating must be applied to the inside of the tank to prevent the chemicals from attacking the bare metal. Special varnishes and enamels such as “probus enamel” and “traycote” are made for this purpose and sold by photo supply houses. They are inexpensive and easy to use as they may either be applied with a brush or flowed on. Ordinary as- phalt may also be used although it is more difficult to apply properly as it must be heated before it will flow. Whichever material is selected it will be necessary to coat the inside of the light- Modern Mechanix and

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Wade from “UARNISH (Pan trap chamber before its cover is put on. If the asphalt is used heat it until quite hot and pour into the chamber. A gentle heat can be applied to the outside of the tank until the asphalt flows over and covers all surfaces with a fairly even coat. For any places which are hard to get at, an old table knife can be heated and used as a spreader. As asphalt dries with quite a gloss which might reflect some light through the chamber, it is well at this time tc. deaden this gloss by gently applying a little turpentine to the interior surfaces. After coating the interior of the chamber, spread a thick coat on the inner surface of the chamber cover and solder this in place, then invert the tank and hold the soldering-iron in contact with the cover long enough to flow the asphalt which was placed upon its inner surface. The sheath racks are simply flat pieces of sheet-metal to which are soldered the channels which support the negative sheaths. With a scribe mark out the loca- tions for the channels. These latter are made by forming a 7/16” wide strip over the edge of a piece of 3/16” iron. After soldering these on, cut V-shaped notches in the base and drill a number of small holes between the channels to assist in the circu- SHEET <—RUBBER

ONE SHEATH AND CHANNEL SHOW! INSIDE VIEW 6

a Mig or TRAP

SHEATH RACK CHANNEL "28 GA. “ie %e topview _- OF BACK: | tee o lioi o at ane d |i o FIN | ®© illli ASADA Li LHI lation and rapid drainage of the solutions. It will be found that by utilizing the spaces between the channels, an additional dozen negatives can be developed without over- crowding. The most accurate way to make the nega- tive sheaths is to lay an old negative on a piece of sheet metal with the top flush with one edge and with a scribe mark around the other three sides of the negative. ANow (Continued on page 130)

This shows the tank with the film frames in their racks. The light trap permits the addi- tion of liquids; will not pass light.

NEGATIVE SHEATH #28GA. LIGHT TRAP PARTITION F28GA.

DETAIL OF ; O | CHANNEL |}~———— |}«—_—_——4%-____-| SHEATH RACK '8 28GA,

The base size of the average varnish can is 4” by 6”, which will allow of a tank being made to accommodate: a dozen cut films 3144 by 41⁄4 inches. Inventions for February All of the metal interior is simple sheet metal work, done with ordinary soldering iron. 109

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SECOND MAGNET HOLDS RIVET IN PLACE TILL WORK iS PLACED TO ANVIL 'ROD- LENGTH TO SUIT DRILL HOLE CLAMP TOGETHER WITH TWO NUTS APPLIED TO MAGNET WILL TAKE CARE_OF WORK WHERE RIVET CAN NOT BE REACHED WITH HAND Many Uses for Permanent Magnets in Sheet Metal Shop p 3 «MAGNET PLACED IN BLOCK OF WOOD A gol IAS E — : HOLDS RIVET IN PLACE WHILE ANVIL IS Nees PLACED UNDER ORK An iron rod bolted to a strong magnet, as shown above, makes a fine tool for placing and holding rivets inside long cylindrical! work. A second magnet on the outside will hold the rivet in place until work can be placed on anvil, Magnet supported in block of wood makes handy vise for holding sheet metal being soldered without burning fingers. ORSE-SHOE magnets such as can be obtained from old magnetos will prove handy to the home workshop fan as well as to the sheet metal worker. They can be used for holding light pieces of metal and for setting rivets and bolts in position in locations which are difficult to reach with the hand. For setting rivets inside a long narrow cylindrical tube, drill a hole in the end of the magnet and bolt on a 3%” iron rod to be used as a handle. A second magnet on the outside will hold the rivets in place until an anvil can be set in position. The same stunt can be used in riveting large flat pieces of metal. A permanent magnet set into a fairly heavy block of wood makes a handy vise for holding small pieces of sheet metal for soldering or lining up a difficult layout. Street Lamps Make Flower Pots THE tops of old decorative street lights make very attractive lawn decorations. The long standard is cut off, and the top part set in concrete on the lawn. Openings in the top are filled with black dirt, and flowers set in. Flowers thrive even better than in the ground. Flowers thrive in this cast iron flower bed. The top of an old street light was set in concrete. 110 Small Power Saw Useful Tool VERY useful hand tool for carpenters and contractors and woodworkers of all callings is being manufactured by a Chicago tool company. This tool, running on 110 volts A.C., is a highly effective little circular saw which can be held in the hand for cross cutting, rip work, mitering, and other operations which require tedious hand labor otherwise. Although light in weight, the saw has plenty of power. This portable electric saw has the accuracy of a bench power saw. It is ideal for the small wood-working shop. Modern Mechanix and

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WOOD ROLLER Mace Of % Maple About 3° Dior, Be heg" Section. Thru Roller tap j 5 Section oC A A 35 l a MO, picto! i o Be E Tur re hg Steel Strop To Hold Gredt for SP End OF Section jilow The Hall sections,. obtainable from Aluminum Corp. of America, are formed in this rolling jig, which is bowed slightly more than the ordi- nates of the wing section being used to allow for spring. by E. V. FAIRBANKS OST light plane builders and designers use a wooden rib for cheapness and ease of construction. For those seeking some- thing new and who want the latest in air- plane construction here’s a metal rib. This metal rib is not new in itself, being used on many of the latest military planes. The Navy dive bombers, a military sensa- tion, use this type of rib exclusively. This type being the only one in continued use that stands the terrific strains imposed upon it, and yet is light. A rib of this construc- tion has been built with a strength-weight ratio of 800. This means the rib will sup- port 800 times its own weight. The metal rib has many advantages over wooden ribs. Some of these advantages are: 1. No sharp edges exposed to the fabric or sewing. This is important as a sharp corner can easily cause the wing covering to rip and tear off during flight. 2. No waiting for the glue to dry while constructing the ribs, or wondering if the glued joint has enough area. 3. No smallest or minimum size as in wood. The smallest size that can hold the load may be used. 4. Any breaks are easily and quickly Inventions for February

Section Thru Bending Block RIBS in eACetal Be Built by Any AMATEUR aA A A R EX a" Maple ‘Wy

NOSE PIECE FLANGE BLOCK Nose Piece Plate -~ OF 18 Ga. Alum. Alloy Airfoil Line Nee Flange Is #Deep Radius In Corner

Metal ribs such as this are used in the Navy dive bombers, and will support 800 times their own weight. The nose flange is made by peening a sheet over a block of hardwood. repaired by inserting a round wooden dowel in the broken part, and securing it in place with a rivet or pin. Diagonal y or vertical members may be re- placed by taking out the rivets or bolts attaching the part, which is simple to do. 5. The material used is all one size, and easy and quickly cut to size. , 6. Strength and lightness as explained before. . The drawings show the rib construction and details for a light plane. The airfoil section used was similar to the NACA M-6. The beam locations and airfoil ordinates are given on the plans for the particular plane you have under construction. All the minor details of construction for this rib are not explained as most builders are familiar with riveting practice. If not, we suggest you read the article on building seaplane floats in the 1930 issue of “Flying Manual”. Here is carefully explained how to rivet properly and successfully. The rivets to use are 1/16 diameter hard alumi- num rivets, or, if you prefer, 4” x No. 6-32 screws and nuts. The ribs are fastened to the beams by round head wood screws. Shaping the Nose Piece The nose piece is made by clamping the metal sheet between two nose blocks in a vise and hammering the flange over with a wooden mallet. Hammer around evenly, not bending it down completely at one place first. The shape of the nose piece flanging block is determined by the airfoil section. The metal sheet is cut by a tem- plate, made by adding %” to the nose piece contour. The flange is evenly trimmed to 3%” depth with tin snips after it has been (Continued on page 118) 11)

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Speedy Model Ice Boat Built With Corks and Razor Blades A cork is nailed to the run- ners, and double edged Gillette blades are cut into the cork to use as runners. Upper right shows photo of boat in use. DETAIL OF RUNNER NY boy can have a whale of a lot of fun with this simple and easy to build ice boat. All you need is a fragment of an old worn out bed sheet, a few razor blades, three corks, and some wire and a few brads. The backbone is the first thing to tackle. This is a strip of pine about 3%” by %”. It must be flat because it has the job of hand- ling the mast and the rudder post and a square stick would be quite liable to split. If you are of a mind to work in hardwood, and want your boat to be more or less of a permanent nature, use birch or maple for these wooden parts. The cross beam is of the same material as the backbone, and if you want a real scale job, taper the cross beam from the center down to the ends where the runner crosses. A couple of inch brads will serve to fasten the runner at right angles to the backbone, and if you want to do the thing right glue in a couple of dowels. The mast dimensions are 3%” by 18”. It can be set in a snug fit hole in the cross beam. The cork docks for the runners are simple wine corks with parallel sides if you can get them, but drugstores handle all 112 THE COMPLETE !CE-BOAT S The rigging of the model ice boat is conventional. A mild amount of slack is afforded in the jib and main sheet to let the sail belly; experience will dictate amount. varieties of corks and you can get what you want at the corner. The sails can be made out of sheeting, and should be hemmed and tightly sewed at the edges. Small grommets can be bought at local department stores in their model air- plane supply departments if you are bent on making a real job of it. Fishline makes the best mast lashing. The razor blades do not need to be sharp-- Thus you can avoid cutting your hands by brushing a file along the edge. When built this little ship should go extremely fast. The model shown was a good sailer. Modern Mechanix and

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An ECCENTRIC SHOP SANDER SANDING BLOCK | RECIPROCATES This eccentric shop sander can be easily made, and serves many useful purposes which a drum ot disc sander cannot. It will sand hard-to-get-at surfaces, and with an oj! stone it makes a fine hone. E HAVE on the market today a pretty complete assortment of machines for the small home shop. Made substantially and for a reasonable price, the handy man can just about get what he wants and with- out pressing him financially. One of the things needed, and which should someday soon be available, is a small machine which will sand hard-to-get-at sur- faces. This with the drum and disc sander will make one phase of home finishing com- plete. This sander will be of the oscillating type. The writer had completed the band sawing of some irregular pieces with sharp angles and found that doing the sanding of those portions of surface not possible on the Position OF Uprights p - EEEN Hides m = = TOOVED by DALE VAN HORN drum or disc sander called for hand methods and so decided to make a machine to do the work instead, providing the design should not prove too hard to handle. The mechanism needed was one which would move a small sandpaper block back and forth, face up, at high speed. Several small motors were available so it was logical that one of these be used for the power plant. To move back and forth the sand- paper block and support would have to be operated by a pitman mechanism probably from an eccentric built into a shaft turned by a grooved pulley. Moreover, there should be a re- duction of speed because, if made of wood and not too elabo- rate, fittings could not be too close, and 1257 oscillations per minute, the R.P.M. of the motors, would doubtless wreck the machine in no time. Still this speed could be reduced 2 or even 4 times and there would still be a speed far greater than would be possible if the block were held in the hand. A 1 inch square of birch, 5 inches long, is put between the lathe centers and turned down to % inch in diameter from end to end and sanded smooth. A block 6% inches square and % inch thick is screwed to the lathe face Plate and turned down to form the pulley 6% inches in diameter with a groove 7/16 inch wide at the edge and about % inch deep. The (Continued on page 126) Fr if pia for CENLT IC 2 N 1 Main Drive art | SURA p ray The essential elements of the eccentric sander are shown here. A small eccentric with 1” throw moves a Pitman crank and thus imparts to an arm sliding in a groove the necessary reciprocating motion, Inventions for February 113

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“Mother-in-Law” SHome LIVING ROOM 20+0"~ 13-0" KITCHEN -— 10°68-6" eer] CHAMBER, 13-O%x 11-0 BED ROOM 20-0" 13-0" The little room to the front of the house is the “mother-in-law” fea- ture of this cosily planned home of simple elements. STORAGE by MAURICE I. FLAGG HE saying that “no house is large enough for two families,” may, or may not be true. No one, however, will argue against the desirability of private quarters for a mother-in-law, a little place she can call her 114 Estimators say that this home can be built for about six thousand dollars, what with prices the way they are now. own with facilities for cooking and many other personal things which mean so much to one who has enjoyed all the privileges of a larger house but perhaps due to cir- cumstances may have been forced to sur- render them. And that’s exactly what house No. 6-W-56 provides. Namely: a “little house within a house.” You will notice how cleverly the front room on the first floor has: been planned. It is quite detached from the main house vet under the same roof. It offers not only sleeping accommodations but a pullman kitchenette, direct access to a pri- vate bathroom and, also, exit from the house without the necessity of passing through the main living quarters. Looking at this equip- ment from another point of view you will see how desirable such a one-room apart- ment may prove as an income producer. The house itself is frame construction. A large livingroom, fireplace, dining room, well planned kitchen, open porch to the rear and enclosed garage complete the first floor equipment. There are two bedrooms, a bathroom, and unusually large closet space on the second floor. The house is what may be called a suburban type and will require a lot of 55 feet frontage. How to Get Blueprints and Plan Books A one-sheet blueprint of any house appearing in Modern Mechanix and Inventions magazine may be had for $1. Two new plan books, “Homes for Newlyweds,” con- taining 32 of the latest ideas for low cost homes, and 16 Selected Homes for Lean Purses” containing time, space and labor-saving bungalows may be had for 15¢ each, or both books for 25e. Address Home Building Editor, Modern Mechanix and Inventions. Modern Mechanix and

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— So has the 1934 MARLEY- DAVIDSON Motorcycle with the FIGHTING HEART ETIRED undefeated Lightweight Champion heart of a champion. There’s no quit in its makeup of theWorld, Benny Leonard has the punch — but amazing speed, getaway, and dogged pulling that wins—the power to smash on through to power. Give it a trial and get the thrill of your life! victory, no matter how tough the going. t- In comfort, ease of handling, classy Air-Flo styling and The 1934 Harley-Davidson has the winning punch, nifty color schemes, this great 74 Twin lives up to the too. Its marvelous TNT motor gives it power that promise of its wonderful motor. “He ee] 39 laughs at hills and mud — 36 eager “horses”! See the new Twins and Singles at your nearest Harley- It’s a true Fighting Heart — like Leonard’s— the Davidson Dealer’s. Ask about his Easy Pay Plans. ey ee ee ee Se ee Oe Harley-Davidson Motor Co., Dept. MM., Milwaukee, Wis. Interested in the ‘‘Fighting’ Heart.’’ Send illustrated literature. Postage Stamp is enclosed to cover cost of mailing. Name. i My age is () 16-19 years, () 20-30 years, ()31 years and up, iia A ( ) under 16 years. Check your age group. - a I 1 a Address l l — oc - - : p T- Inventions .for, February 115

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Naval Covers Are Interesting . TAMPED covers from each of the 347 ships in active commission for Uncle Sam on the high seas make an interesting collection, and show in a novel way the strength of our naval forces. A definite scheme is followed in naming navy ships, battleships being named after states, cruisers after cities, and submarines after fish. Destroyers take their names from deceased naval heroes, the last or full name being used. River gunboats, such as pro- tect our interests on Chinese rivers, are named after our island possessions, and mine sweepers after birds. Oil tankers derive their names from rivers flowing through our oil-producing states, while repair ships, as the U.S.S. Medusa, are named after mythical persons or places. Indian tribe names are used for ocean tugs; the U.S.S. Nitro is an ammunition ship, and the U.S.S. Relief is a hospital ship. Many navy ships use artistically designed cachets in different colors for cancelling mail on Navy Day and on holidays. Naval covers can be obtained by sending self-addressed, stamped envelopes through the proper ports of call to the different ships. Some postmarks of our navy—from battleship U.S.S. Penn- eylvania, cruiser U.S.S. Tallahassee, and destroyer Hart. Old Cover Shows Mail Carriers N INTERESTING cover put out by the English postoffice department in 1890 to commemorate the 50th anniversary of penny postage shows the progress made in mail transportation in 100 years. It is one of the first illustrated envelopes to be issued, and is highly prized by stamp collectors. Just above the address box is a sketch of the North Mail stage coach as it rolled along at 8 miles per hour in 1790. At the bottom is the North Mail of 1890, a long steam train capable of 48 miles per hour. Sketches of postmen of 1840 and 1890 116 seem to indicate they were better dressed in the old days. -- Old illustrated cover commemorating 50th anniversary of England’s famous “one penny black,” showing old and new in mail carriers, Note that date is July 4, 1890. ADLETS FOR HOBBYISTS COINS COINS, California gold quarter size 27c; $34 size, 53c. 3c piece and coin catalogue, 10c. 200 different stamps and stamp catalogue, 10c. Norman Shultz, Salt Lake City, Utah. STAMPS ZANZIBAR! Packet queer freakish stamps from Zanzibar, Algeria, Sudan, Malay States, Victoria, Gold-coast, Nigeria, British Colonies, Souamericans. Don’t delay! Don’t wait. This whooping packet free for 5c postage. Gray Stampco, Dept. M.M., Toronto, Canada. STAMPS! 100 diff. 2c; 500 diff. 35c; 1,000 diff. 90c. Tatham Stampco, D9, West Springfield, Massachusetts. HEADQUARTERS—Magnificent Penny Approvals. Low price sets. Complete Service. Elyria Stamp Company, Earlcourt, Elyria, Ohio. 250 STAMPS 10c; with approvals. Dodge, Iowa. WE BUY stamps. $10.00 to $5,000.00 each paid for old stamps. Buying catalogue 25c. John Chico, 127 Farmington Ave., New Britain, Conn. 1863 LOMBARDY-VENETIA, Corea, Marienwerder, Afghanistan, Surinam, Allenstein, genuine Baden, and $5 U. S.—Ahsolutely free to approval applicants enclosing 3c postage! Viking Stamp Co., Dept. M, Sheepshead Bay Station, Brooklyn, N. Y. TRIANGLES & 60 different stamps from Liberia, Charkhari, Nyassa, Saar, Tanna-touva, Azerbijan, etc., 7c. Gardner, §220-Cuthbert, Baltimore, Md. i Harold Bowen, Fort

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What One Man Did with “Delta” Motor-Driven Tools Makes Complete Modern Bed-Room Suite Tue bedroom photograph above shows a portion of the complete suite in the modern manner made by Mr. Chas. Wheeler, of Englewood, New Jersey, with “Delta” Tools. Many thousands of other “Delta”: motor-driven workshops all over the country are humming busily away making furniture, gifts, toys, household repairs, for enthusiastic “Delta” woodworkers. “Delta” Tool owners, many of them without. previous experience, have made everything from candlesticks to cabin cruisers, at a great saving of time, money, and labor. “Delta” Tools quickly pay for themselves, either in pleasure or relaxation, or in. actual spare-time or full-time earnings. You, Too, Can Do Professional Quality Wood- working This New, Easy Way... It is surprising how quickly you can learn to operate these compact motor-driven ; units, even without any previous experience. Pull instructions are available if needed. . And you'll be astonished how low in price these modern, efficient power-driven units . ate. For full details, without obligation, mail the coupon below. i 10-Day TRIAL 45%, Because ‘‘Delta”’ Tools are efficient and practical under actual working conditions they are always available for 10-day trial without the slightest risk. Satisfaction guaranteed. SERB EES eee DELTA MANUFACTURING company Ë 3775 North Holton Street E Dept. M234, Milwaukee, Wisconsin CATALOG Complete Line of Mod- ern Motor-Driven Tools Newimprovements and new features make the complete 1934 line of “Delta” Mo- tor-Driven Tools of unusual interest to all Woodworkers. The “Delta” line in- eludes: Jolnters, Circular Saws, Band Saws, Scroll Saws, Dritl Presses, Wood- turning Lathes, Boring, Routing, Sand- Ing, and Mortising Attachments, and a complete line of accessories. “Dolta” Wood- turning Lathe Four-speed, sub- stantially made, at surprisingly low price. Has many special features. “Delta” Scroll Saw Revolutionizes Scroll Saw work. Runs at full motor speed — 1,800 strokes per minute — with no vibra- tion. Smooth-cut- ting. Many novel features, “Delta” Drill Press Six tools in onel Can be used for Shaping, Mortis- ing, Boring, Routing, Sending, and Carving. Please place me, without obligation, on jE- mailing list to receive the FREE 1934 g “Delte” Catalog of Quality Woodworking į¥ Tools. Also send full details of your 10- E Day Trial Offer and Easy Payment Plans. Ẹ ` E B E a L] Every man who works with wood— H in factory or home workshop—will want to see this Free 1934"Delta” E Catalog of Quality Woodworking W al _ E L] E ] a Combination Unit (Illustrated above with Mr. Wheeler Tools, It shows the full line of lat- gy Neme........-------c---e----ceeeeeeeeeee Age? ow... Circular Saw eat est “Delta” Tools, It is packed with on convenient stand, No interesting illustrations and descrip- Add cs interference. C set tions. Be sure you get YOUR free TOSS. 2 eene--cnnceree re etereteetentie essen tet E a portaba Oe copy. Mail the coupon—TODAY! C4 p ` DELTA MFG. CO. City. = 3776 N. Holton St. Dept. M234 Milwaukee, Wisconsin DT mpe- Thank You for Mentioning Modern Mechanix and Inventions for February When Writing to Advertisers 117

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Unnenyood Famous Guaranteed Mode! No. 5 Yours for 10 Days No No Money Down— Think of it—over 2 million buyers paid $102.50 (cash) for this model No. 5 now offered direct-to- you at way below % original price—and on easiest terms besides. Positively the greatest bargain ever offered. Accept the special 10-day trial offer and be convinced. Seethe neat, perfect work it does—com- pare its bright, shiny newness without risk. Recognized as the finest, strongest typewriter built. Easy Terms—only 10c a day Here is positively the chance of a lifetime to own a World-famous Standard Underwood No. 5 completely refinished at the very lowest price and easiest terms. All complete with modern improvements including standard 4-row keyboard, Leam Touch Typewriling back spacer, automatic ribbon reverse, shift lock, 2-color ribbon, etc. Ideal for business and professional men— teachers, students, story writers, etc. Don’t let this chance pass by. 10 Day Trial- You save over $60 by quick action. These genuine guaranteed Under- woods now only $30.90 (cash) while limited supply lasts. Send no money! The Underwood is yours for 10 days’ trial. If you keep it—only 10c a day soon pays for your Underwood on our new low price and easiest terms. Send at once before this special offer 1s with- drawn. Remember every machine fully guaranteed and sent on 10 day trial. Learn touch n typewritinè Complete (home Van Sant System given with this offer, Fully illustrated—easily learned. x = International Typewriter Exchange = 231 W. Monroe St., Chicago, Dept. 205 = Send Underwood No. 5 (P. B. Chicago) at once for 10 days’ Li ay if eS 2 i H = 2 B z8 ae perfectly ii I can return it express collect. If I keep it I will pay $2.50 a month until I have palid $44.90 (term price) in full. . State. FORDTOOUGCEOONUSUOEUESETOUSEOOUOCOQREAUOUGUDHORUOEDODLEDSODONRES OU 118 Thank You for Mentioning:- Modern Mechanix and Inventions for February When Writing to Advertisers Model of Dirigible U. S. S. Macon (Continued from page 105) The propellers, .4” long, are cut from light sheet brass or copper, bent to shape, and soldered to the housing. A small drop of solder placed at the center can be filed to represent the propeller hub cap. Four propeller outriggers are mounted on each | side of the ship, just below the radiators. The ; radiators, being flush with the hull, can be made | by scoring the hull lightly with a knife point to |! form the corrugations. | The mooring ball at the nose is. made by bend- : ing a pin at right angles and placing a drop of solder on the head. The hull, contrel surfaces, and control car are painted with aluminum paint. The triangular mooring mast can be built from radio bus wire, with soldered joints. ‘The two wheels at each corner are cut from %” brass rod, with holes drilled in the center to take axles cut from ‘small pins. The wheel housings are bent from sheet metal, drilled for the two axles, and soldered to the mast. The mooring cup in the top of the mast is a ban of solder, hollowed out to take the mooring all. To make the model stand upright on the mantel, insert a length of bus wire in a hole drilled in the hull, and bend to form an additional support. Light Plane Ribs in Metal (Continued from page 111) bent over. The ends of the diagonals are simply and easily flattened in a vise. Nothing hard about that. The top, and, if necessary, bottom chord mem- bers are made by rolling fixture shown on the drawing. The roller rotates on the handles and may be greased to make it roll easier. The chord member is bent to the proper curvature by in- serting one end under the steel strap shown, and bending it around the form by pressing and pushing the roller along it. The form block is made long enough to roll a piece going from the nose piece to the trailing edge. The chord is successively rolled until the chord piece fits the rib jig when removed from the form block and tried. It is necessary to use this cut-and-try method, as well as making the form block of greater curvature than the finished rib, due to the spring of the material. Local high spots may be rolled to get the chord to fit all along the jig. The jig used to try the rolled chord member in is the same jig used for the construction of the rib. This jig is made the same as for wooden ribs, so you know all about that end of it. If not, look up back issues of our magazine. The spruce trailing edge block, which is made by hand, is drilled for the trailing edge wire that is generally used. Also use tape bridging between ribs the same as you always do when assembling the spars (or beams) and ribs. Oh yes—the material used. Full information on the section and material used may be ob- tained from the Aluminum Co. of America with | offices in all big cities. my-

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| saved % by buying direct from the. : Midwest Laboratories this big new FREE Midwest catalog... printed in four colors. It has helped thousands of satisfied customers save from 14 to on their radios... by buying direct from the Midwest Laboratories. You, too, can make a positive saving of 30% to 50% by buying a Midwest 16-tube de luxe ALL- WAVE radio at sensationally low direct- from-laboratory prices. You'll be amazed and delighted with: its super perform- ance! Broadcasts from stations. 10,000 miles, and more away are brought in... “clear as locals’. You get complete wave length coverage of 9 to 2,000 meters (33 megocycles to 150 KC). Now, you can enjoy the new DX-ing hobby. ..and secure veri- fications from world’s most distant stations. Bites you buy any radio, write for Yes, and it gives you WORLD-WIDE. Reception ! 9 TO 2000 METERS These bigger, better, more powerful, clearer-toned, super- Selective radios have FIVE distinct wave bands: ultra-short, short, medium, broadcast and long .. . putting the whole world of radio at your finger tips. Now listen in on all U. S. programs... Cana- dian, police, amateur, commercial, airplane and ship broadcasts. . . and programs from the four corners of the earth. Thrill to the chimes of Big Ben from GSB, at Daventry, England—tune in on the “Marseillaise” from FYA, Pointoise, France—hear sparkling music from EAQ, Madrid, Spain—listen to the call of the Koo- kaburra bird from VK2ME, Sydney, Austra- lia—ete. Never before so much radio for so ‘little money! Write for FREE catalog. =. 40 NEW 1934 FEATURES: :: Try this Midwest radio. .in your own home. .for thirty days before you decide. See for yourself the 40 new 1934 features that insure amazing performance. Other features in- clude: Automatic Select-O-Band, Amplified Automatic Volume Control, 16 New Type ‘ Tubes, Balanced Unit Superheterodyne Circuit, Velvety Action Tuning, Super-Power Class “A” Amplifier, 29 Tuned Circuits, New Duplex-Diode- AMAZING FOREIGN RECEPTION AKRON, Onro~ My Midwest 16 is a real getter for dis- tance. Received 205 stations on regular wave band. .,inelud- 3 ing U- 8., Can- A es adian, Mexican, ‘Cuban and Ha- wanan stations. Also many poe lice, airport and “ham''stations fromalloverthecountry, Have fogged England, France, Ger- many, Madrid, Rome, on 15-30 meter band. South American ‘Stations include Venezuela, Colombia, Brazil, Yucatan. L.H.MOELLER,793 N.SouthSt. MIDWEST. High Mu Pentode Tubes, No-Image Heterodynes, Floated Chassis, Variable Tone Blender, Centralized Tuning, 7 KC Selectivity, New Thermionic Rectifier, Automatic Tone Compensation, Auditorium Type Speaker, etc. tures are usually found only in sets selling from $100 to $150. DEAL DIRECH WITH LABORATORIES Increasing costs are sure to result in higher radio prices soon. Buy before the big advance... NOW, while you can take advantage of Midwest’s amazingly low prices. No middlemen’s profits to pay! You save from 30% to 50% when you buy direct from Midwest Laboratories. . . you get 30 days FREE trial—as little as $5.00 down puts a Midwest radio in your home-Satisfaction , guaranteed or your money back! FREE catalog shows sensational radio values. Write TODAY 1 RADIO CORP. ull Rubber These fea- SAVE ~~. DEPT. E3 — CINCINNATI, OHIO, U. S. A. : Established - 1920 seill: Thank You for Mentioning Modern Mechanix and Inventions for February When Writing to Advertisers Cable Address Miraco. ABC 5th Edition Radio LD'S GREATEST DIO VALUE TERMS) NEW STYLE CONSOLES Write quickly for your FREE copy of thë AS LOWAS] new Midwest og. It pictures a com= 19 plete line of beaftiful, artistic de luxe con- $ @@ | soles and chassis - . . in four colors! Sen- DOWN sational low prices save you 30% to 50%. Also shows performance curves that prove Midwest radios out-perform most of the $150 sets. You can order your Midwest radio from this catalog with as much certainty of satis- faction as if you were to select it personally at A our great radio laboratories. Write TODAY! Dept. 416 Cincinnati, Ohio. Without obligation on my part send me your new FREE 1934 catalog, and corh- lete details of your liberal 30-day REE trial offer. Thisls NOT an order, for Details oO xasunangasuuronn, 3 Address___-____-__>_ ee City... State. _ mn BSnesacncepenassansesennanausessesngacunanens: gase 119

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© Why George Raft Will Never Marry! (J Confessions of a Movie Playgirl! @ Can a Woman Love Two Men at the Same Time? by Miriam Hopkins @® How to Develop Claudette Colbert’s Personality! To give you just a few of the titles of the many great stories in FEBRUARY HOLLY WOOD NOW ON SALE -Other Features Too Numerous to Mention. If your newsdealer is sold out, send 10c to HOLLYWOOD Magazine, 529 S. 7th St., Minneapolis, Minn., and a copy of the February issue will be mailed to you. Fine Fun With Simple Toboggan (Continued from page 93) The boards should be water-soaked, then mopped with boiling water thoroughly before at- tempting to bend them. The accompanying illus- trations show how to bend the frame. Bend carefully applying boiling water, to prevent crack- . ing the wood. When sufficient bend is secured, the handles of the roller may be tied to the frame, and left to set. The next requisite is to cut four cross bars, 14 inches long, preferably out of half round, 11%4-inch in diameter. Square material may be used by planing off the top edges. Cut one-half grooves in the bottom of the bars, about one inch from each end. After the boards are thoroughly dry and the bend set, put on the cross bars, spacing equally apart. The back one should be two inches from the end. Two half rounds should be fastened to the end of the front curve. These cross bars should be put on with 114-inch wood screws, from the bottom, heads counter-sunk. Bending Bottom Next take a length of codfish line, or hemp cord, tie the end securely to the end of the cross bars on the bend, through gimlet holes, then pass the cord down to the first cross bar on the bottom, draw tight and secure in a slip-proof knot, to hold the bend in shape. Continue on with the cord passing through the groove of the next cross bar, loop and on to the last one, cross to the opposite side, and finish up at the bend. This cord is for the purpose of attaching tie thongs in fastening bundles or duffle bags to the toboggan. The bottom of the toboggan must be sand-pa- pered smooth, and if one has a grooving instru- ment, a couple of grooves lengthwise on the bot- tom will help prevent the toboggan slipping side- wise on the trail. If the bottom is treated with a coating of hot pine tar, it will run better and last longer. The tar should be boiling hot when applied; also heat the bottom of the toboggan, and let the tar cook in. Wipe off surplus before drying. Another dope that may be more easily prepared is made of three parts rosin, two parts beeswax and one part tallow. Mix and melt these ingredients to- gether and apply while hot, same as the tar. The draw cord should be fastened at each end of the front cross bars. A broad leather strap with a felt lining should be slotted at each end and slipped over the cord for a head or shoulder pad. Shotgun Recoil Contest Winners (Continued from page 65) as in the case of the barrel with the blank shell. If we let X equal the kick due to the column. of air, then in the vacuum the kick of the blank shell will register 1—X units, and the kick of the loaded barrel 10—X units. More than half the answers. were to the effect that the gun would not go off in the vacuum’ because of the lack of oxygen. A study of the chemical nature of gunpowder will show, how- ever, that the necessary oxygen is supplied by sodium nitrate, one of the constituents of the gunpowder. i l Gm HH A Thank You for Mentioning Modern Mechanix and Inventions. for February When Writing to Advertisers

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Roosevelt’s White House Hobbies (Continued from page 33) In the group of paintings and models above the fireplace in the President’s study, one painting in particular is outstanding, because it is understood to be his favorite. This is an original, a gift from the noted artist, Charles Ruttan, and shows the destroyer “U. S. S. Dyer,” as she looked fully camouflaged, arriving in the Azores. “The Dyer” was the vessel in which Mr. Roosevelt, then assist- ant secretary of the Navy, went to Europe dur- ing the World War, for an inspection tour. ‘On the mantelpiece of the fireplace is a model of the “Amberjack II.” This model was given to the President by a close friend and represents another favorite diversion of Mr. Roosevelt, sail- ing in the open sea. Interesting Ship Models The actual “Amberjack” is a 45 foot sea-going schooner, used by the President and his sons, Franklin, Jr., and John, both under 20 years of age. Last summer after the strenuous campaign preceding his election and the first trying months of his administration, the President and his sons slipped away for a leisurely cruise up and down the New England coast. They did their own navigating and their awn cooking. The President returned happy and cheerful, the picture of buoyant health and deeply tanned. In a large glass case in the President’s study, next to a window overlooking the Washington monument, is an interesting assortment of eight models, Outstanding in the group are two mod- els of the “Mayflower,” the historic ship that car- ried the Pilgrims to America. The models, it is said, are exact replicas of the seventeenth cen- tury sailing vessel. President’s Stamp Specialties Also'in the case are models of a whale and a swordfish; “La Provence,” modern French liner; the “S. S. Olympic”; the “S. S. Mauretania”; and the “Malcolm L, Cropley,” an early American brig. One of the latest additions to the President’s collection of paintings is an original showing the “Gertrude L. Thebaud,” the famous fishing smack that visited the World’s Fair in Chicago and won the North Atlantic supremacy in a thrilling race last summer. Ben Pine, noted Gloucester captain of the sailing vessel, presented the painting to the President. Mr. Roosevelt stands well in the front rank of American stamp enthusiasts. He specializes in stamps of the West Indies, Central and South America. He has two volumes entirely dedicated to the Dominican Republic and a number of rare early Haiti stamps. Actually, though, his interest in philately is general. He has a dozen volumes of general material as well as four volumes of miscellaneous “scrap items” of recent date. His United States stamps fill two volumes. Covers of different varieties and degrees of importance make up three volumes. In the last named group are envelopes from various celebrities, including high goverhment officials, navy officers, diplomats and publicists. Because of his association with the navy, Mr. (Continued on page 127) Thank You for Mentioning Modern Mechanix and Inventions for February When Writing to Advertisers Baffle and Amaze New MAGICIAN’S MANUAL shows how to perform over (00 amazing magical feats, . . . How toentertain at parties and other affairs. . . . Supplies actual maglcal apparatus! eyes—then show it whole again! Tell the color of a ribbon by sense of touch! Take a ring off a string while the ends are held by spectator! Amaze and entertain YOUR friends performing these and 97 OTHER mystifying feats given in the fascinat- ing new Magiclan’s Manual. Be “in demand” at parties! Take the center of the stage at club and other affairs! Put on complete magic shows! This is REAL magic—not just ‘‘kid stuf.” Issued for members by The Magicians’ League of America.:.Complled by Walter B. Gibson, editor of the famous Houdini Notebooks. Real professional magic—yet every trick so simply explained YOU can perform at once! The Maglelan’s Manual first tells just what to do—then pictures each step to show just how—then supplies, in envelopes on pages with instructions, actual magical apparatus used In per- formance! In addition, you get complete programs to follow, and even the ‘‘patter’’ or remarks to make while performing. More Fun to Perform It’s FUN to watch magic—lt’s MORE fun to perform! And it’s fun in itself to master magic with the ald of the Magiclan’s Manual. No tedious “studying”; no tiresome ‘‘practlcing’’; no special skill, such as sleight-of-hand, required. On the very same day that you receive the Maglcian’s Manual you can perform your first feats of magic! Soon, wlth a whole routine of tricks at your command, you are ready anytime, any place, to hold an audience spellbound and delighted! SEND NO MONEY —5-Day Return Privilege! For a limited time The Magicians’ League of America makes this double-privilege offer: 1. Muil the coupon below at once. On receipt of Manual deposit with postman only $2.95 plus ordi- nary postal charges. Then for flve days ‘sample’ its thrilling contents by actual performance of feats given. If then you are not completely satisfied, return the volume for full refund. Ownership of the Magician’s Manual brings free membership in The Magicians’ League of America, with special privileges and services. Be the first in your set to acaulre this new populurity-winning ‘‘mag- teal talent” — mail coupon AT ONCE to: MAGICIANS’ LEAGUE OF AMERICA, (Dept. 52), 225 Fifth Ave., New York, N. Y. Cey a ribbon in half right before everybody's Special blinding supplies articles for performance right with instructions. Nearly 200 pages, Includ- Ing text, card and paper Inserts. 7% in. wide by 10% in. high. Bound in heavy- blue linen, stamped in gold. m Ll = — a — = ia MAGICIANS’ LEAGUE OF AMERICA (Dept. 52), i 225 Fifth Avenue, New York, N. Y. Yes—send MAGICIAN’S MANUAL at once .and register me as a Member of The Magicians’ League. On arrival of Manual I will deposit with postman $2.95 plus postal charges. I reserve right to return volume after five days’ actual trial in which case my deposit will be refunded. Send to: Ay NGE aranera E E PA Address sau. Massey ateaane enna eeenenn ate Yeo atasi aia S City and State... (Send $2.95 with this coupon and save postal charges— same 5-day return privilege.) 121

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Bea Civil Engineer! Cyclopedia of Civil Engineering 7 great volumes. 2,800 pages. 1,600 illustrations. ‘New edition’ just off the press, by twelve of America’s greatest engineers. Ineludes: Surveying; bridges, railroads, steel ‘structures, mu- nicipal - engineering, ‘water supply, road building, etc. WE no aun mant „a Year—and Up! CIVIL’ ENGINEERING'—in plain English written so you con understand it, even if you have only a limited education, Prepares you for a well- paid railroad structural or public works position. Covers every branch of Civil Engincering practice. At once a reading course for the ambitious student and an authoritative reference work for the ex- Perienced engineer. Borrow a set—free. Look over the teat questione which help you mneler cnch subject quickly, Mail the coupon without obliga- tion today! Spanish Grain Flex- ible Covers Gold Stamped Loaned | Free! To prove you can learn Civil Engineering at home in your sparé time. And be- cause no description here could do it justice, to let you see for yourself the scope ‘and simplicity. the authority ‘and quality , of this great home- reading course. Cost and termes are within: your ‘reach. | Send- no money—just mail the coupon. American Technical Society American Technical Society, Dept. ©2320, Drexel at58th St., Chicago Lwant to BORROW the CIVIL ENGINEER- ING Gyclopedia for 10 days FREE. 1 will gladly pay the few cents exprese, but I am to ay nothing for the loan of the 7 big volumes ig return Shem within 10 days. If 1 wish to keep them I will send you $2 after the 10 daya, then $3 a month until special advertisingiprice $29.80 is paid. Send latest Edition. Natle:oo-- es sece eee ceees Address --~------------------- B (Altach letter stating age, occupa = tion, employer's name and address) TRICKS WITH 110 VOLTS Electric Fun! Make toy motors, buzzers, tops, machine guns, arcs, shockers, lights obedient to the voice, window novelties, floating rings, spirit rapping—all kinds of amusing and practi- cal electrical devices. Our book gives full direc- tions for doing 200 stunts with 110 volts, A.C. = Price postpaid $1.00. CUTTING & SONS 24-D St. CAMPBELL, CALIF. Get Your Own Patents | Pay only government fees. Legal blanks and book with complete instructions, postpaid $1. CUTTING & SONS, 24-D St., CAMPBELL, CAL. a em a a FLYING BEN—Master of Them All 85% unbreakable. Can crash trees; walls, buildings without breaking. Shock’ absorbing landing gear. 332 ft. wing spread. 22%4 inch fuselage. Weight 12% .oz. Flies 200 tó 700 feet at one winding. Patented oiled rubber motor. In a class by itself. Get yours now SPECIAL FACTORY PRICE TO YOU This ‘aeroplane-is 73% built. Requires only simple as- ONLY sembly. Tor $2 extra you can get one completely built $ 95 ready. to fly. Shipped in a large box. Send for PREL 3 colored folder which shows plane in flight and crashes. — FLYING BEN MODEL AIRCRAFT Co. 2659 N. Parkside Ave. Dept. 28 Chicago, UI. Ask Your Newsdealer for the New 1934 HOW-TO-BUILD-IT . Simple Memory Feat Amazes Guests (Continued from page 81) concentration will be necessary when this is done. If the trick is to be most convinc- ing, the mind should work fast, the faster the better and the more confusing to those who happen to be watching or joining the contest. Some people will be able to master the code in an hour of concentrated study while others may require two or three hours of study. At any rate when the thing is mastered the trick becomes dis- gustingly easy and even the rankest amateur per- former may put on a most interesting and as- tounding performance. And now for the method. Let it be assumed that the following words form the first part of the list of 30 that is to be given: Automobile, Locomotive, Airplane, Box, Blanket, Cow, Glasses Watch. How to Use Memory First, it should be kept in mind that the first letter of the words that are given is not important and no attention is to be paid to it for it has no bearing on the system whatever. When each word is given, the performer should immediately asso- ciate the object represented by the word with the object that has been memorized and a mental pic- ture of the two immediately formed and concen- trated upon for a brief period. The same is done with every word. As an example: The first word is automobile and the first word in the alphabet list is anchor. -We instantly form a mental pic- ture of an automobile going down the street and towing a large anchor. This is an incongruous picture, but that makes no difference. Form Mental Pictures Next, we come to the word locomotive and this we have to associate with the second word of the list, barrel. Well, we might place the barrel on the stack of the locomotive and remember it in that way or we might place the barrel on the front of the locomotive in place of the headlight. The word airplane must be associated with the third word of the list, coat. When this is mentioned we might think of an airplane dashing through the air with a coat tied to it and fluttering in the tail breeze. This process of association is kept up right on through the list and if a small instant is used to impress the mind with these picture combinations and if the list has been memorized thoroughly, the performer will be able to in- stantly recall the whole list of words while his friends, not a wit less clever than he, will probably recall the first few words and then stumble on to a sad defeat in the memory game. The performer adds a great deal to his glory when he asks the person who formulated the list to pick out random numbers and he will give the proper word. In this connection, his mind works in this way: The word may be the twenty- third one. Twenty-three represents the letter W in our list and this in turn represents the word wheel. When the person calls “twenty-three,” the performer immediately thinks of W and then of wheel and then of the particular object that was associated with wheel when the test began. In. this way he can flit about the list and give words that would:seem to be quite beyond all human attainment. Ee N, C0 Thank You- for Mentioning Modern Mechanix and Inventions for February. W hen Writing to Advertisers

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Youth Designs, Radio Phone (Continued from page 83) From that conference between the high school student and the “scientific” police chief, now a world renowned criminologist, was born the Berkeley police radio system—first police radio on the Pacifie coast and a model for those since established in other western cities. After installing the police radio, Tibbetts went back to his attic room and plunged anew into his experimental work. Second in Edison’s Contest ; Shortly afterwards, he took time off to enter the late Thomas A. Edison’s “national intelligence contest,” in which he came out second in compe- tition: with thousands of the brightest young in- tellects in the country. On completing high school Tibbetts took up electrical engineering at the University of Cali- fornia where, immediately after admittance, he was elected vice-president of the college branch of American Institute of Electrical Engineers. A few weeks ago, engineers of the huge San Francisco-Oakland bay bridge, which will be five miles in length, were ready to begin actual construction of. the gigantic project. They had solved engineering problems never before confronted by bridge builders. Yet there was one problem which had not entered into their calculations. How were they to communicate with one an- other while directing work on the structure— work which was to proceed simultaneously on a dozen different fronts? Instant, dependable communication facilities were imperative, but the ordinary telephone was impractical because of the fact that it was neces- sary to speak to men aboard launches, tugs and ether types of mobile equipment. It was here that Tibbetts entered the picture. He placed before Earl Lee Kelly, director of public works for the state of California, and C. H. Purcell, chief engineer of the bridge, a proposal by which very. high frequency radio telephones would be installed to solve the vexing problem of prompt communication from isolated and mov- ing construction points. Solves Communication Problem Tibbetts suggested simple, inexpensive, espe- cially manufactured equipment made from his own design after consultation with Charles L.. Watson, president of Western Wireless, Ltd., of San Francisco, and.Frank C. Jones, chief con- sulting engineer of the company. The upshot was that Kelly and Purcell gave Tibbetts a contract for the installation of 22 ultra- high frequency radio telephones, to be placed at designated points in the bay and along the course of bridge construction. Tibbetts obtained the services of two “pals,” and started to work. His assistants are Charles Simpson, University of California student and Charles Patterson, who enters the university soon. Tibbetts’ equipment operates on frequencies of 41,000, 51,400, 61,000 and 63,000 kilocycles. Provisions for the use of such high frequency radio were not included in regulations of the Federal Radio Commission and it was necessary (Continued on page 124) ———— eee Thank You for Mentioning Modern Mechanix and I nventions for February When Writing to Advertisers The New Opportunity -in Accounting and how you can take advantage of it ‘Never before, has there been as great an oppor- tunity as now faces efficient bookkeepers and accountants. And here’s why: In the first place, every firm will watch its accounting as never before. This depression has taught executives the vital necessity of know- ing all the facts about their business, where their company stands all the time. Then our new governmental policy — con- trolled economy—forces the keeping of better and more complete records in every office and plant. It willnot be a matter of choice with any firm—it will be necessity» For instance—the National Industrial Re- covery Act—with regulation of production, minimum wages, uniform prices, codes of prac- tices—centers around cost control and uniform accounting within each industry. The new Federal Securities Act with its in- sistence upon publicity of complete facts about every company selling its securities publicly will compel more frequent and more accurate financial statements—and these in turn call for more and better accounting. Ask About lt And as business gains momentum, there will, be a greater demand for trained bookkeepers and accountants—they will go back to work sooner and in larger proportion than any other group—in fact, accountants tell us the demand will probably soon exceed the supply. This spells real opportunity—for the man already in accounting, and for the capable man who will start training immediately, What are you going to do about it? Are you going to sit back and let the other fellow beat you out? Or are you going to be one of the first to take advantage of this opportunity—to go back to work or to win promotion and larger income, to profit and advance by the big changes? „The answer is up to you. But the man who is wise will at least investigate promptly—he will fill out and mail the coupon below. It will bring full information without obligation, CRS RSE ST BESS ee SBE eS LaSalle Extension University The Institution that has trained over 1,200 C.P.A’s Dept. 2493-HR Chicago Kindly tell me, more about the present opportunities in accounting and how your training can help me grasp them. Also send me—free—your booklet on pacconatancy, the Profession That ays. O Higher Accountancy Other LaSalle Opportunities: Ií more interested in one of the ficlds indicated below, check and mail now. OBusiness Management OExpert Bookkeeping OModern Salesmanship OC. P. A. Coaching OTraffic Management OG Business Correspon. OLaw—De¢gree of LL. B. OBusiness English OCommercial Law QStenotypy OPractical Accounting and Office Management 123

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Household and auto- jobile necessity. Gives ere foot ‘ight beam. Adjustal gl pe EASy $5, F DAYS Possible with new magic invention that —_ lights gas instantly without sparks or flame. A sure sale wherever artiñ- tial gas is used, Retails for 25c. al MYSTERY GAS-LIGHTER Also Frictlon Packedon ind!vidoal cards with inatructions. Gas Lighters Sample 10c. Rush $9 per gross or $1 per dozen. ior Natural Gas C NEW METHOD MANUFACTURING CO, ACT NOW New Method Bldg., Desk MG-2, BRADFORD, PA. ANY PHOTO ENLARGED Size 8x10 Inches or smaller If de- sired. Same price for full length or Dust form, groups, landscapes, pet (H animals, etc., or enlargements of any WRITTEN BOND // GIVEN WITH Ç part of group picture. Sate return of original photo guaranteed. SEND NO MONEY 10st mai photo or snapshot (a any size) and within a week you will receive your Garai ul Hife-like enlargement, guaranteed fadeleas. us nonlage—or send 49c with order and we &x20-Inoh ‘enlargement sent C, jo and we pay postage. Pay postman 470 we pay postage. Bli O. D. 78c plus a postage or sen Take advantage of this amazing ofer now. Send your Bhotos today. Specily size wanted, Standard Art Studios, 908 W. Lake St., Dept. 374-B, Chicago, This EASILY You can’t imagine the j joy you will get out of playing a P- A Sar’! It’s so simplified you'll master it easily and quickly. From the very start you'll attract t that warm admiration you so much desire, and with your rapid | progress will come a fine, easy job; 4 ‘big pay; social position; the primrose a dife.Send today for free book et,beau- tifully illustrated, of P-A instruments. “| No obligation. Moderate price and | easy terms. Send postal today sure. | PAN-AMERICAN Moderate. Price iYOuU Can Do. Youth Designs Radio Phone (Continued from page 123) for the bridge contractors to secure special permits. Use of the equipment is limited to visual range, since the short waves approach light waves in their effect. Tibbetts’ entire transmitter and receiver is only 14 inches long and 8 inches square. The tubes are all of receiving type, while the usual radio transmitters use special and expensive tubes. The antenna is simple and takes up little room, a desirable feature on a small tug or within a limited construction area. The antenna, a half- wave vertical radiator, consists of a rod less than 12 feet in length, the length depending on the exact frequency employed. The receiver construction is standardized. Pow- er is obtained either from the ignition battery supply of mobile equipment or from'a lamp socket where lighting current is available. Calling is done on a stand-by loud speaker, any station wishing to call another speaking the call letters or location of the point desired, into the microphone. The called station answers in the same manner. Where only one frequency is available com- munication may be carried on by use of a single simplex channel—that is, the same wave length in both directions. The focal point from which orders will flow to bridge workers is at bridge headquarters, Clay and Sansome streets, San Francisco. The building is in full view of all bridge construction areas. . After completing installation of the equipment, Tibbetts has agreed to train 60 men in its use. Build This Wee Steam Engine! (Continued from page 99) the drills. After this is done an end mill may be substituted for the chuck and the end of the main bearing machined. A heavy cut and then a very light finishing cut should be taken. Then the bear- ing face is machined so that it is just 3/10 of an inch back of the end of the main bearing. After this the piece may be turned around and the main bearing machined to specifications. If no milling attachment is available, the piece may be clamped to the tool slide and shimmed up until the line of centers of the lathe intersects and is perpendicular to the center-line of the piece. The face must be adjacent to the head-stock: The holes along the center line may be drilled and the faces machined as before, using the lateral feed to determine the distance between the face and the end of the main bearing. The order of machining is the same except that the ports must be drilled with a hand drill. This completes this part except for the lapping of the cylinder face on the standard face, which is done when the engine is completed and assembled. The next piece to consider is the cylinder. It is made from a brass casting and machined on the inside only. The pattern is made exact size and a core print made to make the cylinder hollow. Fillets of wax are applied to all angles as be- fore described. It is chucked in a three-jaw chuck and the cylinder is turned out to the required dimensions. It will be lapped later when it is oo Thank You for Mentioning Modern Mechanix and Inventions jor February When Writing to Advertisers

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Build This Wee Steam Engine! complete and the piston is made. The last cut should be very fine with a very slow feed. Then it can be clamped in a V block and the bearing face filed carefully until it comes to dimensions. The finishing is best done by rubbing it on a flat piece of carborundum cloth. It will later be. lapped as described under the description of the. base. The hole to take the bearing bolt and the. steam ports are next laid out and drilled. The twelve holes to hold the cylinder heads may be drilled and tapped to whatever size will be satisfactory. The stuffing box is the next thing to consider. It is made from machine steel or brass and ma- chined all-over. The thread can be put in with a special tap designed for shallow holes or can be turned. on a lathe. The two (2) cylinder heads are machined out of brass and drilled as per dimensions. The lower head has a small collar on it which is threaded to meet the stuffing box. Angles are countersunk in both parts 60° with the plane of the cylinder head. (This holds the packing.) _ The piston can be turned from a piece of cast iron or mild steel and it is machined all over. It has a tolerance of one-thousandth of an inch in the sketch but that is not a hard and fast dimen- sion. The best bet is to lap it in until it is a fairly loose fit and take care of the tolerance with a piston ring. i ` The piston ring is turned from a cast iron pipe and split after it is turned. It is turned oversize and split and then the ends are filed until it fits the cylinder nicely. The piston rod is turned from a single piece of brass to suit dimensions and threaded on the top for a small nut to retain the piston: This completes the cylinder assembly except for the piston bearing bolt or stud, according to how the constructor has made it, and a spring to hold the cylinder against the base. This should be strong but not so strong as to impair the motion of the cylinder when it oscillates. Now that both the base and the cylinder assembly are completed, they may be lapped together using a very fine lapping of valve-grinding compound. The crank shaft is of the built-up type, as per drawing. Machine steel is preferred. The flywheel is rough machined from brass and pressed on to the end of the crank-shaft. ` The manifold can be made any way the con- structor sees fit. The diagram is only a suggestion. There is a great deal that can be changed but the holes for the intake and exhaust of steam must be exactly as the sketch shows. The intake holes are the two countersunk holes through the standard that open on the face for the cylinder bearing. The author will answer all correspondence on this subject gladly. Address N. A. Welch, 202 Grosvenor St., Douglaston, L. I., N. Y. Send for FREE COPY of MODERN MECHANIX BLUEPRINT BOOKLET Thank Yau for-Mentioning Modern Mechanix and Inventions for February When Writing to Advertisers YW 23 Million Car mebo oun! Owners Need You Pues will be the greatest year in history for GOQD auto- mobile mechanics, men who know their “stuff” “and can correct any auto fault. Over 23 million car owners will need work done and will have the money to pay for it. Complete overhauling jobs will be common. It’s up to you to know all cars, be able to fix anything that comes up. If you can do this you'll get a fancy price for your work and make more money than you’ve made in years. These 6 big Auto Books which we offer to send free for examination tell you everything you need to know and do it in such a way that you can easily understand it. The jiffy index lets you put your finger right on the information you want immediately without long reading or study. Don’t miss this opportunity. These Six Big Auto Books Include Prac- tically Every Known Auto Fact— Wiring, Diagrams, equipment Charts, etc. Aviation motors, free wheeling, synchre-mesh, outboard motors, mo- torcycles all fully cavered. De luxe flexo binding, 2700 pages, over 1800 Iustraticns, make this the largest and best auto encyclopedia ever published. Amazing Offer There are no strings to this offer whatever. These 6 books will all be sent to you for free examination if you send: the coupon below. Take ten days to look them over and to decide whether or not you want to keep them. Then if you ure satlsfied, send ‘only $2.00 and then $9.00 per month until the special price of only $24.80 is paid. There is no further obligation. If you send now we will include, without a penny of extra cost, a year’s membership In the American Technical Society which entitles you to free consultation privileges with 12 experts on any difficult automobile job. SEND NO MONEY | American Technical Society Drexel at 58th Street, Dept. A2320 Chicago, Illinois I will look at the 6 big Auto Books if you send them for free examination. I am to pay only the-few-cents delivery charges unless I decide to keep the books in which case I will send $2.00 in ten days and $3.00 per month until the total price of ‘only $24.80 is paid. You are to include free a year’s membership in the American Technical Society.

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BUILD A FRONT DRIVE! The construction of a real midget front drive auto as this “SILVER BULLET" with my surprisingly simple drive arrange- ment, using ‘‘T’’ Ford parts, is easy with my blueprints! With your motor- cycle motor, pref- erably 4 cyl., and other old car parts, you can make this 4 wheel brake, front drive; and best of all, you don’t have to own Send stamps for further de- tails and imme- diate reply. 2 machine shop to build this fast car. BOR! EDW. A. RAEGER 3450 N. Marshfield. Ave. Chicago, Ill. LEARN TO DANCE BROADWAY STERS AT HOME contcty, draceuy This new, simple method teaches you quickly and easily. 20 DIFFERENT STEPS FOR ALL MODERN DANCES. TANGO, WALTZ, Be modern FOX TROT. The dreamy WALTZ. ae atest h SOCIETY STEPS will make you HEALTHIER, MORE POPULAR. YOU’ HE UNJOY DANCING. Money Dack if not satisfied after 10 days’ Irlal. Don’t be a wallflower. GET SOME ENJOY- MENT OUT OF LIFE! Write for full particulars, without obligatlon, to IRVING SCOLNICK, 147 West 42nd St., New York A RAILWAY B E TRAFFIC INSPECTOR BOTH BUS AND RAILWAY--STEADY PAY GOOD PAY for active men-19 to 50-trained as Bus and Raltw: Passenger Traffic Inspectors. Heattht ul, outdoors- pa Raliway main near home. On completion of a few weeks’ home stud can start you in a position paying up to $140 per month, iia expenses. Experience brings rapid advancement. r 15yrs. . T. l. has secured positions tor hs graduates or refunded tultion. Costa little: terms. Free Booklet. Standard Buginess Training Institute, Div. 6102, Buftalo, N. Y. How to Build 20 Boats + g 50 Cents at all newsstands If your newsdealer is sold out, send 50 cents to FAWCETT PUBLICATIONS, INC., 529 South Seventh St., Minne- apolis, Minn. -ci 126 Build an Eccentric Shop Sander (Continued from page 113) lips each side of it were % inch thick. Before removing this from the face plate a’ hole is cut in the center, with chisel held to cut a true hole, % inch in diameter. Two other wheels are also needed for the sides of the eccentric. These are cut from 34- inch thick stock 3% inches in diameter, each exactly alike, and before removing, they are sanded and a % inch hole put squarely through the center of each for the main shaft also. After removing from the lathe, the chuck is put on the shaft, a % inch bit inserted, the two wheels clamped tightly together and a % inch hole bored: through each, midway between edge of center: hole and rim. The short shaft which actuates the’ pitman goes through these. Construction of Sander With the ends of this 214 inch length shaft cov- ered with glue, the two were connected. While. the glue was still soft, the center holes of the wheels were also coated with glue and the main shaft driven through the wheels. The pulley wheel was also glued on the main shaft, 1 inch from the extreme end. During this interval the frame, pitman and sliding stick were made. The uprights are two pieces % inch thick, 2% inches wide and 10 inches long. A % inch hole was bored through the top of each. The pitman is constructed as shown with a slot in the upper end 9/16 inches wide and 3% inches long. . The base is a piece of scrap. It was reduced to 16 inches in length, 3% inches in width and its thickness is 1 full inch. 5% inch from one edge a groove % inch deep and % inch wide was cut. This groove forms the seat for the slid- ing piece which is actuated by the pitman and carries the sandpaper block. The front end of this was provided with a slot to accommodate the lower end of the pitman. Assembly of Workshop Device When the glue job had thoroughly dried, the shaft reseated between the lathe points and the lathe started in low speed and the wheels again trued up. (Sometimes slight warping occurs due to the glue moisture or too snug a seating.) Then the lathe was stopped and the portion of main shaft between the small wheels was sawed out. The parts are now ready for assembly. The shaft fits through the upright bearings and the lower ends are nailed and glued to the front end of the base as indicated with a try square to insure accuracy. The sliding stick, % inch high and 13/16-inch wide, with a length about that of the base, was put in the groove and the lower pitman end inserted in the front slot and a 4 penny nail put through for bearing. Then two sets of %-inch holes were bored through both uprights and pitman, 1 inch apart and 334 inches above the lower ends of the uprights for a piece of %-inch dowel which was used for the pitman pivot. The two sets of holes per- mitted. varying the back-and-forth motion of the sanding block from 1.to 2 inches. A leather belt was slipped over the pulley and to a motor with 4 speed cone pulley. igos» Thank You for Mentioning Modern Mechanix and I nventions-for'February When Writing to Advertisers

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Roosevelt’s White House Hobbies (Continued from page 121) Roosevelt is especially fond of naval postmarks and is constantly on the watch for Civil, Spanish, and World War cancellations of naval character. In 1918 the President was senior naval repre- sentative of the United States in Europe. This work brought him in touch with King George, the acknowledged dean of British philatelists, and the cares and troubles of the war were laid aside while conversation centered on their hobby. Finds Rare Stamps in Trunk . The President began collecting stamps as a small boy. He said he might have dropped the hobby as he grew older, had it not been for an accidental find in an old trunk in the attic of his home where he discovered a package of letters written by his grandfather, Delano, while in the diplomatic service in China. The dates ranged from 1856 to 1870. The find was a treasure. It included examples of the first stamps issued by Hongkong. The President’s collection of lithographs is very treasured. Art authorities say that Mr. Roosevelt has some of the finest Currier and Ives lithographs in the United States today. These are quaint prints of ancient nautical scenes and clipper ships—prints that originally sold for not more than 50 cents apiece, but which now com- mand hundreds of dollars each and sometimes a thousand dollars or more. The President was among the first to realize their historical value and started collecting them as a young man. Hobby Delays Conference The term lithograph simply means a printing picture originally engraved on a flat stone. Since no photographs are available of the vanished sailing ships of old, colored lithographs are of great historic value and are always in demand. ‘On more than one occasion Mr. Roosevelt has been late for an appointment because he was lured into a print shop or an auction room seek- ing these old lithographs. While Governor of New York he once had an engagement with a very important official at four o’clock. Time passed. The official grew restless. Mr. Roosevelt arrived finally at five-fifteen with a couple of prints under his arm. He explained that he had seen some likely items in a print shop window, entered the shop, browsed, talked and lost all track of time. But he had found a print or two that he wanted. Rumor has it that the personage has now taken up collecting himself and is also late to important appointments occasionally. During the past six months there has been no time for auctions and none for browsing. But. even in these busy days the President’s personal secretary goes through all auction catalogues and mentions items that may be desirable. These are the President’s hobbies. Although one of the hardest working officials in the coun- .try, he finds rest and pleasure with these diver- sions. Through them all runs the salt tang, the rolling waves, the brisk wind and the adventure of the sea. They are the outgrowth of a thwarted ambition of the boy Roosevelt, who wanted to be a sailor, but instead was sent to Harvard by his father. His avocations have become many and now place him at the head of American hobbyists. HIRD Thank You for Mentioning Modern Mechanix and Inventions for February When Writing to Advertisers BECOME A RADIO EXPERT GOOD JOBS Learn Radio-Television Electricity & Talking Pictures in Los Angeles A GOOD JOB AWAITS YOU IN 1934 IF YOU TRAIN IMMEDIATELY National will quickly train you to qualify for good jobs in all branches of radio, television, talking pictures, broadcasting, operating and general electricity. Thorough practical training. Over $100,000 in modern equipment. Complete broadcasting and television studios where ycu get actual practice in all branches of these interesting Temunerative trades. GRADUATES IN DEMAND Regardless of age or education, you can learn profitable trades in a few months in this foremost training school and be in demand for good jobs. More than 30,000 graduates, EARN ROOM AND BOARD Seventy-five per cent of our studenis earn living expenses while receiving training. We help you get a job. Write and tell us your financial circumstances. RAILROAD FARE ALLOWED For a limited time we will allow your coach railroad fare from any part of the United States to Los Angeles, We can- not guarantee to continue thts remark- able offer indefinitely. TRAIN IN LOS ANGELES This is the ideal city, Center of great- est activity in radio, talking pictures and electricity. Approximately one bil- lion dollars being invested in California in electrical development, including gi- gantic Hoover Dam, L, A. Power Aque- duct and Central California power pro- gram. This means new jobs for years to come. QUALIFY AS A Radio Repair Man Television Expert Control Operator Station Technician Sound Expert Ship Operator Broadcaster Electrician and many other jobs “COMPLETE COURSES We offer four complete courses at low tuition fee originally asked for only one course. You are trained in fundamental principles of electricity and radio work, you uperato actual equipment under personal direction of experienced instructors and learn by actual shop experience. Upon graduation you can qualify for scores of good jobs anywhere. ASK FOR DETAILS Send coupon for descriptive ilt- erature. You owe it to yourself to become thoroughly acquaint- Oldest Trade School in the West ed with this great school. You Est. 1905 will find the facilities here a positive revelation. Get new 30,000 book, which gives you all the i facts In story and pictures— Graduates SEND COUPON AT ONCE! NATIONAL RADIO c ELECTRICAL SCHOOL: fos Ang Dept. MMR-2, 4006 So. Figueroa St. Send Book and full details of Courses. Namo ........05 Address

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BE YOUR OWN FIXER | AND SAVE. THE REPAIR MONEY \ NJ ITH Smooth-On No. 1 you can make the following repairs quickly, easily and well: —Stop leaks in n steam, water, gas, oil or stove =] pipes, mend cracks, breaks or leaks in furnaces and boilers, radiators, tanks, sinks, pots, pails, make loose handles tight on umbrellas, knives, hammers, brushes, drawers, etc., tighten loose screws, hooks, locks, door knobs, etc. On the auto:—Make cracked wa- ter jackets zood as new, stop leaks in radiators, hose connections, gas tanks and gas, oil and exhaust lines, make a fume-proof joint between ex- haust pipe and tonneau heater, tighten loose headlight posts, keep grease cups, hub caps, and nuts from loosening and falling off, etc. No skill required and the Smooth- On used on any one job seldom costs more than a few cents. Get the booklet from us and Smooth-On No. 1 in 7-0z., 1- Ib. or 5-lb. tins from any hardware store. SMOOTH-ON MFG. CO. Nal Dept. 69 570 Communipaw Ave. ; CEMENTS Ro N Jersey City, N. J. Dot with SMOOTH'ON 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. HOME . AUTO REPAIRS — Write for FREE BOOK RAY KUNS, Guaranteed, Electric $ Motor | All paris to assemble high-grade electric motor. Pulley included. Full instructions. Runs from a 4 to 8 volt battery or trans- former. Operalcs hand-made loys, erectors, ete. Edutatlonal. Years of fun. Money , Back Guarantee. Sent POSTPAID for $1. Dremel Mfg. Co., Dept. 332,. Racine, Wis. Dept. A, LINCOLN POINTS f ë to a fascinating aviation THE WAY career with big pay suc- + know how to properly train you for the Dét- RAA a ter jobs in Aviation. Unexcelled equipment. IZ SI Training includes blind flying, cross coun- SPA Nm diry, acrebaties, master mechanics, airplane Les | and engine course. Government Approved = School. Best Known School, is the place to start. Lxceptlonal oppor- tunities for rich rewards to properly trained pilots and me- chanics as Lincoln trains you, in Central and South America as well as in the U. S. Aviation courses taught in elther English or Spanish. Write! State your age. LINCOLN AIRPLANE & FLYING SCHOOL cess. Here Government Licensed Instructors Now is the time to start training. LINCOLN, the World’s 4025 Aircraft Bldg. Lincoln, Nebraska ~oche 128 Guns From All Nations in Movies (Continzed from page 77) the firing begins. Care must be taken that the actors do not come too close to the guns in the’ heat of battle or serious burns may result.. At. the same time the action must not be repressed. When the scene has been filmed the guns are once more collected and put back into boxes. Real bullets are seldom fired on the set. Some-: times, however, the action calls for a door to be- perforated, say, or bric-a-brac to be smashed. Then an expert marksman is called in to do the. shooting. Actors and workers alike are cleared’ off the set so that there will be no possible chance of anyone being. struck. Convert Weapons to New Types = “Incidentally,” says Stembridge, “the arsenal’ will not deliver ‘live’ ammunition to a company unless it can show a special order signed by the studio production manager.” In battle scenes where great numbers of rifles are needed, a few, of course, may be dummy guns, unequipped to shoot even blanks. Nevertheless, they will be fashioned with extreme care to match the period in which the story action takes place. On the other hand, “fireable’ weapons are sometimes converted from one type of gun to another—as for instance, a cartridge rifle to the old muzzle-loader of our fore-fathers. A recent order of this kind, Stembridge said, called for more blunderbusses than the arsenal had on hand. They were to emit smoke exactly as the ancient weapons did, both from the end of the barrel and from the ‘firing pan. Get Guns From Germany Devising the bell-mouth was fairly easy; a small brass auto horn properly shaped and wired on every gun successfully achieved the effect. The firing end of the gun was more difficult. Here’s the way it was done: A small flash pan was fastened near the trigger. A hole in the breech allowed sparks from the exploding cartridge to ignite powder in the pan, giving a wisp of smoke. It is seldom necessary to “fake” the wanted type of gun, since genuine firearms of every make, period and country are stored in the vault-like rooms of movie arsenals. Of course, in huge war spectacles, where large numbers of troops are used, the resources of the movie gun-rooms “play out” and the studios have to go outside for additional firearms. Universal’s “All Quiet On the Western Front,” for example, not only exhausted the arsenal’s stock, but utilized $30,000 worth of arms equip- ment bought in Germany especially for the pic- ture. In addition, large numbers of guns were borrowed from American Legion Posts around Southern California. Every type of weapon, from giant howitzers to German automatic pistols, played their part in that great production. During the vogue of gangster pictures, machine guns were used on nearly every stage, Stem- bridge says. And, of course, the ever-faithful Western always has plenty of gunplay. Today, with war and adventure films popular, the use of firearms by the movie studios is prob- ably even more general. Yet, because of the ex- treme care exercised in handling firearms and ammunition, no gun accident has ever occurred. ugye» Thank You for Mentioning Modern Mechanix and Inventions for February When Writing to Advertisers

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Byrd Broadcasting From South Pole (Continued from page 49) About 800 miles from Little America, near the South Pole itself, two men will live in a hut buried in snow to study weather conditions. It will be the nearest basé human beings have attempted to maintain at either pole. During four months of polar darkness, their only means of communication with the rest of the expedition will be by radio. And communicating -with these stations and with the outside world, if possible, will be the 100: watt short wave radiophone on Byrd’s giant Condor. While the ice breaker, “Bear” of Oakland, re-establishes Byrd’s old base at Little America, the “Jacob Ruppert” will carry the admiral to the Weddell Sea, 1,500 miles south of Cape Horn. Om the ice barrier there the giant Condor, equipped with skis, will be unloaded, fuelled, and heavily provisioned. Plans Longest Polar Flight With Pilots June and Commander C. O. Noville, Admiral Byrd will bid farewell to the “Ruppert” and take off on one of the longest polar flights ever attempted. From the Weddell Sea the trio will fly across frozen wastes never seen by man to the South Pole and then to Little America, a distance of approximately 2,500 miles. On this flight Byrd will attempt to talk over the Columbia Broadcasting Company’s network either directly or through the station at Little America, which now on the “Jacob Ruppert” has the call letters KJTY. That broadcast will bring to millions the roar of the motors in the 75 below zero air above the Pole. To breach the 10,000 miles from Little America to New York Columbia has arranged for a recep- tion outpost at Buenos Aires, 4,000 miles from the Antarctic station. The Buenos Aires station will rebroadcast the South Pole programs to assure good reception in the United States. To Use 66 Radio Channels In charge of the broadcasting at Little America will be John N. Dyer, Columbia Broadcasting system engineer, and Charles J. V. Murphy, pro- duction man, who will also act as announcer. Dyer, 23, one of the youngest members of the expedition, is an expert in short wave transmis- sion, especially directional work. A directional antenna will be used at Little America. This will increase the signal volume of the station in one direction about twenty times. Murphy, newspaperman and former sports announcer in Boston, will have the job of arrang- ing the weekly programs during the expedition’s two years in Antarctica. The Federal Radio Commission has assigned Byrd’s main station fifteen wave lengths fof voice transmission and fifty-one channels for code signals. The broadcasts will not be confined to the regular weekly programs. Should a feat of exploration occur or tragedy take place, Little America will immediately get in touch with the Columbia Broadcasting System.in New York and the network will. be tuned in through the basic station WABC in New York City. (Continued on page 133) Thank You for Mentioning Modern Mechanix and I nventions for February When Writing to Advertisers 49 Weekly In Yo ur Own Home ree, No soliciting | No canvassing! We show you how to make big money decorating fast-selling Giftwares. We start you with the big $10 Artist’s Outfit shown above. We supply you with $150 worth of Gift- wares free of extra charge and shaw you how to dispose of them without leaving your home. We give you 29 Tested Plans for mak- ing money. Cne Fireside Member says, “I made $100 on furniture in W one week.” Anolher writes, “My ‘% sales were $500 for 5 weeks. This is my first year.” R.M. P., of Iil., says, “ʻI did $3,500 worth of busi- ness last year and over $12,000 this year.” D. W., New Mexico, reports, “I would not take $1000 for my Course.’” No Experience Needed You too may havea guaranteed In- come opportunity with Fireside. No tiresome study. You learn by doing. No artistic ability neces- sary. Our easy 3-Step- Method makes the work easy to learn and easy to do and fits you to make an good money practically from the (fe start. Quick Sales in Your Home No need to leave the house to dis- Dose of everything you make. Our new automatic salesman does all the selling for you. Designed to quickly find cash buyers for all the Giftwares you ean turn out. No Cost Plan Send coupon for details of new plan that pays for your Fireside Course besides putting big cash profits in your pocket. Mail coupon now while openings for new members are still being offered. FIRESIDE INDUSTRIES ` Dept. 142-B Mich. Fireside Industries I Dept. 142-B, Adrian, Mich. } Send me FREE Book on Home Decorating l for a big steady invome. Also details of | Plan that will pay for my Course and give me big profits besides. i ! l

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I will pay the few cents delivery charges. 1f1 wish, l may return books is 10 days and owe you nothing but If T decide to kee I will send $2.00 after 10 Yaya, then only $3.00 @ month until $19.80, the op special Introductory price, ia paid. Send latest edition and include drawing instruments. For Beginners Written, so you can 3100.0 eek. ust the beginning —FOR DRAPTAMEN HAVE, THE BEST CHANCES FoR ADVANCEMENT. Pleasant, fascinating work enny to leara and do. Learn quickly with these booka —zend coupon for a sat FREE E and see for yourself, A year's consulting membership in thi dive Technical Society now given free to all readers of this famous eyclopedia of drafting. than the cost of ihe books. Many say that it is worth more Complete set of drawing instruments if you send for these drafting books NOW. These instruments are made of the finest of German silver, ate absolutely accurate and are parked in velvet lined leatherette pocket case. Real $10 value, but free to you with these books. AMERICAN TECHNICAL SOCIETY. Dept. D2320, Drexel at 58th St., Chi Nate. ...------2--+.00--ecernee ne ea nns nenneenmenonbensanenannen amen lenensnnnanesncenesae aie Address --------++----0000cenensnennnnnenanceeecceneeswnsenanenemenseansca tense enenneneennne. Attach letter stating age, occupation, employer's name and address and that of at lenst one business man as a reference. WITTE Engines Operate on Gasoline, Kerosene, Distillate or Natural Gas. 2 H-P to 30 H- P The finest engine built. Enclosed, } Self-Oiling, Timken Roller Bearing. Modern as a 1934 Automobile, Cash or Terms. Direct from Factory to \ you. Also Feed and Meal Mills. UE Write for FREE CATALOG. & WITTE ENGINE WORKS 1572 2 Oakland Avenue, | -R Carson Street, NSAS CITY, MO. PITTSBURGH, PA. PAINT SIGN FOR YOURSELF AND OTHERS! NO LESSONS OR EXPERIENCE REQUIRED wareror WITH LETTER PATTERNS) FREE SAMPLES? J-F. RAHN, C2120 NEVA AVE., CHICAGO EVER MADE A TELEGRAPH INSTRUMENT? Well, all the working dope on how to do it is in this book. Every step is fully described. And boy! what a kick you’ll get when you start “sending”. Don’t go another day without this BOOK. 96 Pages describ- ing the making of 33 Devices Bells, buzzers, secret locks, signale, electro magnets, ete. You'll never get more real instruction for any. dime you’ve ever spent than what’s crammed between the IR. covers of this book. YOUR copy Ye is waiting. 10 cents (coin or ‘stamps) to Dept. B2, ee National Carbon Co. Inc., New York City, brings it. -Q 130 Daylight Developing Tank (Continued from page 109) about 14” on the bottom and %” on each side to be bent over to form rabbets to hold the negative. Do not have the negative fit the sheath too snugly or it will bind after the asphalt coating has been applied. Bend up a por- tion of the bottom margin to form a support for the negative and also to permit the free circula- tion of the solutions. A V-shaped finger slot is also cut in the top of the sheath. The proper location of the channels which sup- port the racks can now be determined and when these are soldered in place the remainder of the inside of the tank is ready to receive its protec- tive coating. Cover of the tank is made from two 5/1 16” boards with a sheet of rubber cut from an old inner tube glued between them, the whole held together with screws driven from the inside. The lower board should fit snugly inside the rim of the tank, and the upper board, together with the sheet rubber, should extend about 5/16” all around. Coat the lower board the same as the inside of the tank. Operation of the Tank The construction and manner of attaching the cover clamps is shown in the photo. Any desired pressure may be obtained by simply adjusting the nut. Pulling -down on the threaded end of the bolt engages the nut with the wire, resulting in a water-tight seal between the rubber and the edge of the tank. : The outside. of the tank and cover may be fin- .ished as desired; two coats of aluminum bronze giving it a-neat and attractive appearance. : In operation. the one-tank method is simple, yet ‘exact, and produces negatives of uniform quality. ‘Load the negatives into the tank in total dark- ness or with;a suitable safelight. Take out into the light and. pour in the correct amount of de- veloper to entirely cover the negative. Fill the tank at a single pouring or development will be uneven. For the same reason turn the tank on its side or top several times during development. Negative Stays Until Dry When the specified time has nearly elapsed, drain out the developer and fill with clean water. Shake this around a few times, drain, and pour in the fixing solution. When the negative has been thoroughly fixed, drain out this solution and run in at least six or eight successive fillings of water to wash the negatives. This method of development eliminates any chance of the negatives receiving scratches or fingerprints due to careless handling as it is un- necessary to touch the negative from the time it is loaded into the tank until it is entirely dry. If the negative is on glass it may remain in the sheath until dry, if on film clip a spring clothespin onto the upper margin and hang up to dry. To travelers, especially, will the simplicity and compactness of this system make its appeal. De- veloper and hypo in tablet or powder can be used and stored, when not in use, within the tank itself. It will be found an easy matter to develop: the negatives of each locality before leaving it, thus serving as a constant guide to correct ex- posure. Thank You for Mentioning Modern Mechanix and Inventions for February When Writing to Advertisers .

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Expert Tips on Winter Ice Fishing (Continued from page 72) run, the line is released from the notch and slow- ly unwinds. Line wound on a stick as shown in the same drawing, will likewise unwind and per- form equally as well. The idea is to slow up the fish and wear it out. In jigging for fish, particularly pickerel or great northern pike, obtain any manner of ordinary wobbling spoon in a medium size, let it down in the water and by a steady jerking up and down you‘will attract the fish to strike. The wobbling spoon, that darts from side to side when thus operated up and down, is the best. cs Stops Line From Tangling In jigging for pickerel, pike or lake trout (the latter best fishing in February), particularly where fish ranging up to twenty or more pounds in weight may be met with, lay your line out for some distance back of you on the ice so that when a fish is hooked your line will not get tangled. Much depends upon how you make the hole in the ice whether you can land the fish once you have hooked it. Accompanying illustrations show the right and wrong way of making this hole. ‘With the hole large at the top and tapering nar- row to the bottom, the line is likely to be fouled on the ice and there will be a world of difficulty met with in handling your catch. Here are a few kinks. You can pick minnows out of the minnow bucket with a small two-inch wide coffee strainer, instead of dipping the hands in the cold water. A three or four inch round strainer’ can be used to advantage in skimming the slush ice after you have cut the hole. f Salt Adds Pep to Minnows Mud-minnows make the best winter-fishing . minnows. They are very hardy. Chubs and shiners taken from. flowing water demand well aerated water. A little salt in the water adds pep to the minnows. Protect the minnow bucket from freez- ing by wrapping it about with a blanket. A large glass jar or a small box with galvanized mesh containing minnows may be let down in the water to the level of the fish. The fish will be attracted, attempting to get at the minnows in the bottle or the box. Fish around them and you are sure to have success. A small gold spinner, size 2, on a shaft ahead of your minnow often adds twice as many fish to your string. A fine mist-hued gut leader of six feet in length practically makes the connec- tion with the hook invisible. This will help you get fish, especially in waters where the fish are “educated” up to the wiles and methods of the fishermen. The leader should be made limp by putting it in lukewarm water, and keeping it be- tween moist pads till you use it. Wall-eyed pike and crappies are two winter fish that can be caught at night. Like the owl they are nocturnal, and see in the dark. Fish for pike and pickerel off of the mouth of streams coming into lakes. Fish off of points of land, and between islands and the mainland, if the passage is narrow. Set lines are best em- ployed at such places. In cold weather the fish go deep and lie idle. In mild weather they move out on feeding runs and are often found in more shallow water. nl” Heip Your Kidneys ‘WIN BACK YOUR PEP Good Kidney Action Purifies Your Blood—Often Removes the Real Cause of Getting Up Nights, Neuralgia and Rheumatic Pains—Quiets Jumpy Nerves and Makes You Feel 10 Years Younger. A famous scientist and Kidney Specialist recently said: “60 per cent of men and women past 35, and many far younger, suffer from poorly function- ing Kidneys, and this is often the real cause of feeling tired, run-down, nervous, getting up nights, Rheumatic pains and other troubles.” If poor Kidney and Bladder functions cause ‘you to suffer from any symptoms such as Loss of Vitality, Getting Up Nights, Backache, Leg Pains, Nervousness, Lumbago, Stiffness, Neuralgia or Rheumatic Pains, Dizziness, Dark Circles Under Eyes, Headaches, Frequent Colds, Burning, Smart- ing or Itching Acidity, you can’t afford to waste a minute. You should start testing the Doctor’s Prescription called Cystex (pronounced Siss-tex} at once. Cystex is probably the most reliable and unfail- ingly successful prescription for poor Kidney and Bladder functions. It starts work in 15 minutes, but does not contain any dopes, narcotics or habit- forming drugs. It is a gentle aid to the Kidneys in their work of cleaning out acids and poisonous waste matter, and soothes and tones raw, sore, irri- tated bladder and urinary membranes. Because of its amazing and almost world-wide success the Doctor’s prescription known as Cystex (pronounced Siss-tex) is offered to sufferers from poor Kidney and Bladder func- tions under a fair-play guaran- tee to fix you up to your complete satisfaction or money ack on return of empty pack- age. It’s only 3c a dose. So ask your druggist for Cystex today and see for yourself how much younger, stronger and better you can feel by simply cleaning out your kidneys. Cystex must do the work or cost noth- ing. Thank You for Mentioning Modern Mechanix and Inventions for February When Writing to Advertisers

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-BUILD-IT 1934 Edition| The 1934 How-To-Build-It is ready for you! Loaded with plans of all descriptions, hints on all kinds of shop work, it is a gem for the man. who wants a ready reference work on “how to make” most anything under the sun. The titles above are but a part of the cargo! That boat you’ve wanted, that baby car, that special type of drawer joint—you’ll find ’em all in this great constructional book. GET YOUR COPY NOW! Half a dollar everywhere—If your dealer cannot supply you write to Modern Mechanix and Inventions Publish- ing Co., 529 So. 7th St., Minneapolis, Minn. + - mp. 132 Thank You for Mentioning Modern Mechanix and Inventions for February When Writing to Advertisers

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Byrd Broadcasting From South Pole (Continued from page 129) By means of radio the 60 scientists and adven- turers at Little America will be able to hear from and communicate with relatives during the great adventure in the South Polar regions. Radio, too, will carry to the Antarctic encamp- ment of huts advice of medical experts of the United States, if necessary. The purpose of the second expedition is to map and claim any areas of ice recession about the Pole, to determine natural resources that might be utilized by man, to gather data on weather conditions and radio disturbances, and to discover if the ice barrier represents a waning Ice Age or the beginning of a new one. Byrd will also attempt to fly to the South Mag- netic Pole, 1,000 miles from Little America, for photographs and other scientific data. With trac- tors and snowmobiles, as well as sledge dogs, he will establish bases in the territory explored. To feed his dogs alone Byrd is carrying 50 tons of food to Little America. Fifty sleds and 150 sets of harness are also part of the equipment. Dr. Guy O. Shirey, chief medical officer of the expedition, superintended the selection of food for the men. It includes dehydrated vegetables, Pemmican, a concentrated fat and meat food, Erbswurst, consisting of pea meal and bacon, Bovril, a concentrated beef beverage, and two ounces of Vitamin C fluid to replace the hun- dreds of bushels of fruit that would be required for the entire expedition. Even philately is among the varied interests of the expedition. The first South Pole United States postoffice was established when John Oli- ver Lagorce, vice-president of the National Geo- graphic society, was sworn in as postmaster. Lagorce described his office as 9,810 miles south of Washington and of an “underground igloo nature.” Approximately 50,000 pieces of mail were carried to Little America, President Roose- velt himself asking Admiral Byrd to send a letter for his famous stamp collection. The expedition supported by 1,400 backers has 14,000 separate pieces of scientific equipment, valued at $100,000.. From this great exploration expedition at the bottom of the earth will come the thrills of adven- ture as Little America takes the air. The Magic Palace of Radio City (Continued from page 41) of Freeport, Ill., Vicksburg, Miss., Jackson, Tenn., or Boise, Idaho. All buildings connected with the enterprise are biggest. All studios are biggest. There is the greatest number of biggest things one can possibly imagine. The central auditorium or broadcasting studio, where the dedicating tycoons and guests met, is 75 by 132 feet, and has stages which are reversible. Any brief description of Radio City must of necessity be a statistical parade. This “City” is the western part of the Rockefeller center which occupies three square city blocks, so valuable that the yearly renial is $3,000,000 for land alone. The central tower, or RCA building i in which is housed NBC’s new headquarters, dominates the whole community, It is 70 stories high, rising 836 feet in the air. ot Thank You for Mentioning Modern Mechanix and I nventions for February When Writing to Advertisers A Special Course on Arm Building 25° we not get an arm of might with the power and grip to obey ONLY your physical desires. I have taken weuklings whose arms were scrawny pieces of skin and bone and in a short time developed them into stroùg men of powerful proportions wlth bulging biceps and brawny forearms . . . strong, solid arms of power that are respected by men and admired by women. This course is specially planned to bulld every muscle in your arm. It has been scientifically worked out for that purpose. Many of my pupils have developed a pair of triceps shaped like a horseshoe, and just as strong, and a pair of bleeps that show their double head for- matlon. The sinewy cables between the biceps and elbow are deep and thick wlth wire cable-like ligaments. The forearm bellies wlth bulk, the great supinator lifting muscles become a column of power, and thelr wrists are alive and writhe with cordy sinew. Send 25c for this course today. Why not start now to bulld a he-man’s arm? You can’t make a mistake. The assurance of the strongest armed man in the world stands behind this course. I glve you the secrets of strength illustrated and explained as you like them. Mail your order now while you can still get this course for only 25c. I wll not limit you to the arm. Try any one of my courses listed in the coupon at 25c. Or, try all six of them for only $1.00. RUSH THE COUPON TODAY! Mail your order now and I will include a FREE COPY of “NERVES OF STEEL, MUSCLES LIKE IRON.” It is a priceless book to the strength fan and muscle builder. Full of pictures of marvelous bodled men who tell you declsirely how you can build symmetry and Strength the Jowett Way! Reach Out... Grasp This Specia? Offer! EREE cF erous strone ma EAA Ne pe JOWETT INSTITUTE OF PHYSICAL CULTURE Devt. 37Bc 422 Poplar St., Scranton, Pa. George F, Jowett: Send, by return mail, prepaid, the courses checked below for which I am enclosing. O Moulding a Mighty Arm, 250 O Moulding a Mighty Back, 25c O Moulding a Mighty Grip, 25c DO Moulding a Mighty Chest, 250 O Moulding Mighty Legs, 250 D Strong Man Stunts Made Easy, 25e O All G Books for $1.00. * Nerves of Steel, Muscles like Iron "* SENT FREE! Name Age Address ipe. 133

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BALLOON TIRES Size ‘Rim Tires Tubes 29x4.40-21 $2.15 $0.85 | 3 20 2.35 0.85 os to fai 5 setof NON-GLARE HEADLIGHT EELECTORS So Ba Sa WI NID LO 00. OUT. Ai UAMNOOUUUINUIOUUOUS IRERERER ER ERR IOS H a tt end Pest ponh et CO 9 2) ERANA NANANA K- 9 WWWUWWWWNNNNNNNN, AO. .50-20 ; Send $1.00 Deposit with each tire ordered, Balance Ç. O. D: If you send. cash ‘in full $ deduct 5%. Youare guaranteed a year’s sery- ice or replacement at 34 price, Order today. MIDLAND TIRE & RUBBER CO., Dept. 3923 1000-10 West Sixty-Third Street, Chicago, Illinois. Makes old guns like new. : Will not injure finest steel. Wa No heating is necessary, $40 ; (UN BLUE Restores the finish on 5°§— ie i guns in, ten minutes or & emcees Send for circular ‘What Gunsmiths Say” ae New Method Gun Bluing Co. Desk MMG-2, New Method Bidg. BRADFORD, PA. Write for free booklet describing “87 Plans for j Operating a Successful Business of Your Own”. tia Make from $20 to $100 a week starting in spare time at home. No peddling or house-to-house selling. Booklet sent free, and without obligation. Write for your copy today. ELITE PUBLISHING CO. Dept. G 214 Grand St, New York, N. Y. EVE- -A Specifications: 15” tong overall, 6” high. Takes, L THE pieces up to 914” long. 234” In diameter. All metal; : d a construction. Fully adjustable. 2 speed, Filla need for inexpensive, smooth- tunning lathe. Runs from your treadle or fractional H.P. motor. Face plate and driving dog attachments included, flso list of $0 articles possible to tum on this lathe. Sent postpaid on receipt of $2.00, outside U. S.. $8.25. Send 3e stamp, for, folder de- ¢ gBcribin: z uzziemak- er? Jie Saw, $2.80. Dril p gg The Giftmaker” Press, $1.00 Diac Sander, etc. 480 St. Paul Street, Rochest AL STUDY AT HOME We guide you step by step—furnish all text material, including fourteen-volume Law Li- brary. Training prepared by leading law profes- sors and given by members of the bar. Degree of LL.B. conferred. Low cost, easy terms. Get our valuable 64-page “Law Guide” and “Evi- dence” books free. Send for them NOW. LaSalle Extension University, Dept. 2493L Chicago ii 134 Thank You for Mentioning Modern Mechanix and Inventions for February When W riting to Advertisers Seth Parker Sails for World Cruise (Continued from page 37) jammer on a voyage of adventure around the world. Over the bounding main he has gone seek- ing undersea monsters, sunken treasure and fierce jungle animals. With him went the Jonesport, Me., of radio fame. Ma and Seth Parker took with them their entire cast of Sunday evening entertainers so radio listeners of the National Broadcasting com- pany might not miss the regular weekly get-to- gether of Jonesport folks. Lord, who is 33, was born in Meriden, Connecti- cut, of humble parents and from the start got an inside into plain, rustic New England life. Rural Sketch Brings Fame After graduating from Bowdoin College, he tried business, school teaching, and writing and was not successful, He worked in a candy fac- tory to keep his family from starvation. Then one day he heard a radio broadcast that was a iake-off on rural life. He recalled Sunday hymn meetings in the home of his father, the Rev. Albert J. Lord, and set out to write a radio sketch of his boyhood memories in Connecticut and Maine. A radio station in Hartford, Conn., tried it. It was a great success and soon the National Broad- casting company took over “Sunday Evening at Seth Parker’s.” Seth Parker became famous. The commercial fruits which accompanied that popularity put Phillips Lord in the Easy Street class. He was able to carry out his school day dream. The Seth Parker expedition set out early last December, bent not only on facing the horrors of the seven seas, but also prepared for invasions of the jungles and for adventure undersea. Seeks Animals for Museum Besides carrying an elaborate radio set-up, the schooner was equipped with complete hunting regalia for bringing back alive some of Africa’s prize animal catches. Special diving bells were to be used for the capture of sea monsters. They hope to catch those monsters which have existed more in sea myths and which have never actually been brought back. They are determined to check up on these legends. If the sea-beasts do actually exist, they'll be brought back for the Field Museum in Chicago. The Seth Parker map also has points where treasure ships are sunk. Lord and his men will attempt to retrieve as much as this trove from the bottom of the ocean as they possibly can. Expert divers have been taken on the journey for this special service. This part of the trip is all a dark secret. ` During the eighteen months that the Lord ex- pedition is spending in girdling the globe, the Sunday night programs are not being interrupted. The Jonesport, Maine, folks will send their en- tertaining Yankee programs by short-wave to Buenos Aires, Singapore, Honolulu, Rome or London from which cities the broadcast will be relayed to New York for the NBC chain. Ask Your Newsdealer for the New 1934 HOW-TO-BUILD.-IT mos

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ECRETS of Beautiful Dancing for the first time by R EV EA L E this remarkable new scientific method—the Danceograph. Make your dancing magnetic, fascinat- ing, alluring, glamorous, PROFES- SIONAL. Learn what it means to really dance. Send only $1.98 for com- plete course—l0 easy lessons. 5 day - trial. Money back if not satisfied. Mark X for course desired. D Ballroom [] Tango [J TapandClog DANCEOGRAPH DANCE ART, Ine. San Francisco, Callf. | RTOON YOUR WAY FY SUCCESS! 7 DON’T COPY - LEARN TO ORIGINATE! RAYE BURNS will teach you HOW ta Cro en ORIGINAL CARTOONS at home that you aS 85 Send name and address for free details. Only...- 555 Sutter St. SELL! Course has 26 lessons and 600 illustrations, RAYE BURNS SCHOOL, Dept. F-X, Box2194, CLEVELAND, OHIO ADVERTISE YOUR BUSINESS WITH CARTOOR House Organs, Display Ads., Circulars, Snappy CARTOONS produce MORE SALES. Peppy cartoons, any subject. Series developed at special rates. Samples 10c (coin). FREE cartoon of yourself. Send snap shot, name & address and only 25c (coin) to cover mailing & materials, Write NOW. TRAG 1934 RADIO CATALOG Write for our new catalog .. . most complete line of latest radio sets, service men’s supplies, Teplacement parts at lowest wholesale prices. ALLIED RADIO CORPORATION 833 W. Jackson Blvd. Dept. B Chlieaga MAN IN EACH TOWN To Plate Auto Parts, Reflectors, Bathroom Fix- tures, Refinish Beds, Mirrors, Chandeliers, by new method; no capital or experience required. Simple plan of manufacturing at home starts you in big money making business. Outfit fur- nished. Free particulars and proofs. GUNMETAL Co. Ave. P Decatur, III, fi No talent or EEA necessary, Fascinating work. Pays big money. Compiete instruction nt book ells oua Alphal ets, Colors, How to Miz S77 how Cards, Window Board and Wall ey A Paints, Signa, koio made letters, Gilding. Tricks of e, also gives 100 Alphabets and De- eee Book bound in flexible imt. leather- / gold edges,and four hall bearing Show Card 44 [] Pens. Sentpostpaid$3.00..C.0.D.)10c ex. £] Ogilvie Pub, Co.,57 Rose St. Dept R.Y. City || EARN. EA ; si START.’ HOW TO BECOME A RADIO AMATEUR Booklet “How to Become a Radio Amateur” is available at Modern Mechanix and Inven- tions, 529 South 7th St., Minneapolis, Minn., for 25c. Tells how to build an inexpensive receiver and transmitter. ere 1 Thank You for Mentioning Modern Mechanix and I nuentions for February When Writing to Advertisers Students Individually Instructed Learn Autos | IN LOS ANGELES —if you NEED A JOB! Big opportunities await the trained man in 1934. Millions of old cars need repairs. New models coming on the market must be serv- iced by trained men, thoroughly familiar with the new designs. For 28 years National Automotive School has offered practical training and has graduated 30,000 successful students. In the recovery from depression the last man to be hired is the untrained man. The first lo be hlred is the man with training Tecommended by a suceessbul trade school. We train you by ‘‘actual shop methods’’ on newest equipment—late model autos in the largest school in the West. A million dollar institutlon. Train For A Few Weeks And You Are Ready For Job Don’t worry ahout previous experience or whether you are too old or too young. You - can train under our successful methods if you are ambitious to obtain the right kind of experience and instruction for a good pay job. No test books or uninteresting night study. Individual instruction by experienced instruc- tors which makes our method one continuous course of pleasant_training. We offer life- time scholarship. You can take the course in a few weeks or longer if you prefer. SPECIAL High Speed Diesel Engine Course—now being ADDED Send for Free Book You Can Quickly Learn Every Branch of Auto Trade The complete course trains you in every branch of the auto trade, qualifying you to run your own shop or accept a good job. The National course of instruction includes thorough training in every branch, including the following: Motors Chassis Shop Practice Garage Management Trouble-shooting Batteries Auto Electrlelty Carhuretion Machlne Shop Pracllce EARN ROOM & BOARD If you need financlal help you can earn room and board while taking your course, by ac- cepting a part-time job. RAILROAD FARE ALLOWED TO L. A. For a limited time we will allow coach rail- road fare to Los Angeles from any point in the United States. Establish Your Own Shop Hundreds of our students are oper- ating their own shops and have become financially independent. Up- on graduation you ean qualify to es- tablish your own business in the automotive field. FREE EMPLOYMENT SERVICE Unlimited free employment service to graduates. SEND FOR FREE AUTO BOOK Write today for the complete story. Our big Free Book wlth full details will be sent post-paid. Don’t lose another minute. Learn how you can most easily qualify for a good job in shortest length of time. Mail coupon. No obligation. NATIONAL AUTOMOT VE. SCHOOL : Š Dept. MMA-2, 4006 South Send Free Auto Book y yaara i tf ts ? ned! Name... 3 $ ss! Address City ytive: iige» 135

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Aigh School Course in ce This 2 Years - i ed: com- plete High School course—specially: pre- pared for home study by leading profess- ors—meets all requirements for entrance to college, business and leading professions, Over 200 noted Engineers, Busi- Co I [ e g e noss Men, and EA e o helped prepare the special in- r al n l n g8 struction which offers you college- osa grade vocational training at home. . 3. Government figures show that the high school graduate averages $16 a week more than the grade school graduate, while the college man averages $25 a week more than the high School graduate and $41 a week More than the grade school graduate. The University of the Home No matter what your inclinations may be, you can’t hope to succeed without proper training, Check ki yithout 1 proper ea uD Ae ee ind of work preferred and let us American School Dept. H-223, Drexel Ave. at 58th St., Chicago --Architecture & Bulldi -El if i --Automaotive Engineering = “Clit Engines? aen Management A) --Gomplete kaw ae r Accountin: P. -- Mechanica! li l -IDrafting & Design TIHigh School Course” NOM6 oc ecb ies cee esa ese eee eee ees Age...... Address HOW AND were To FIND GOLD A new prize book that tells prospectors, miners, and treasure hunters where to look for and how to find gold quickest. All the Information is authentic, complcte and easily understood. All the gold bearing rocks and minerals explained. New rich gold and silver locations given where fortunes may be made, FRE $3 VALUE MINERAL RODS for Detecting Gold and Silver sent with book order if you will send ns names of three friends who might buy this book of exclusive information, “How and Where to Find Gold.’” There ls no other book on gold like it, or that tells near as much. Learn how to be a prospector and find gold. Just 10 ounces a day will bring you over $920.00 daily. Send for this book Bow, and get the FREESHINERAL RODS for locating buried treasure. Attrac- tively bound in black an gold. Price $2.50. Cash or sent C.O.D. E G@.L. Guggenheim Co., Pub. Dept. 11-B, 112 Sutter St. San Francisco, Calif. HOW AND WHERE 10 FIND GOLD. IF You will like “TUE AMATEUR SCIENTIST.” You Interesting, authoritative articles just the way you LIKE want them. Non-technical. Devoted to ASTRONO- S CIEN CE MY BIOLOGY, PHYSICS, CHEMISTRY, RADIO “THE AMATEUR SCIENTIST” Shamokin, Pa. „Amazing New WALL CLEANER Ends Drudgery..Saves Redecorating! Bean new! Absolutely unique! Needed in every home ia revolutionary wall cleaning giscorery. now. makes every old- style method entirely obsolete. Saves re~ decorating. No raga, no sponges, no mess or musal Exactly like le this new clean- Ing invention literally erases dust, dirt and ime ag you draw it across the surface, Ko kack “breaking worki No di an also. cl Wii E shades upholstered furniture, lo e. Women wild about it. Low OFFER priced, Not sold in stores. Send for catalog of this and 47 other household con- . Introductory offer gives @ chance Write today. TEE MFQ. CO, AKRON, OHIO Wedell, Air’s Cowboy Speed King (Continued from page 58) He soon bought the motorcycle. He became the fastest moving person in Texas, but discovered there was a faster vehicle in the air. Jimmy learned to fly, won prize money in motorcycle races and bought a biplane. : Teaming With Williams Barnstorming one day he landed at Patterson, La., and met Harry Williams, son of. Louisiana’s sulphur magnate. He told Williams all about the future of passenger flying business.. Williams be- came interested and offered to go into partnership with Jimmy. Soon they had an air field, shop, and a dozen planes at Bayou Teche. The partnership grew into a full-fledged air line, the Wedell-Williams Air Service, with planes flying regular schedules to New Orleans, Houston, San Antonio, and Laredo. Some persons might have been content with such achievement, but not Jimmy Wedell. He had. other ambitions. He knew ships and motors and. he figured they ought to go faster. So again he confided in Williams. He wanted to build really fast planes. So he went to work in the shop and stayed there literally night and day, taking trips but occasionally. He worked. steadily for months. Soon a new ship-with a new motor, built accord- ing to Jimmy’s own ideas, took form in the shop. Streamlining, the principle used in automobile building after air engineers had shown the way, was called in in its highest form. For the first time even landing wheels were streamlined. The great day came when the craft was pushed. out of the shop. Jimmy strapped on a parachute. He started the “works” at only 800 feet. . Then disaster. A wing crumpled and fell off. Jimmy jumped in a parachute. His plane was wrecked, but he knew how to design fast planes. In five years his experiments brought results. Capt. James Haizlip won the Bendix trans-con- tinental dash, Mrs. Haizlip then won the women’s world speed record and Col. Roscoe Turner cap- tured another cross-country dash with Wedell ships. ` Jimmy then broke Jimmy Doolittle’s Ottawa to Mexico City record by flying 250 miles an hour, a total of 12 hours, 36 minutes. World’s Mark Meanwhile Doolittle set a world’s mark for speed in a land plane, 294.36 miles an hour. Wedell decided to beat that. He tinkered with his “No. 44,” low winged, red and black stream- lined monoplane. He put in a Pratt and Whitney Wasp Sr., 800 h.p., 1,344 cu. in. displacement, super charged motor, 2,400 revolutions per minute. He used a Hamilton two bladed, controllable pitch propeller. He flew to Chicago for the National Air Races. No. 44 roared into the air. Four laps. Stop watch- es clicked: 316 miles per hour; 299 mph., 311 and then 294, an average of 305.33 miles an hour— the world’s record. Jimmy Wedell, the Texas cowboy, was the speed king of the air! —_—_—_—_—_—_—_—_—s—SsSsSsX—s—S—S————____—__..—0—X_XaPk———— aaa Thank You for Mentioning Modern Mechanix and I nventions for February When Writing to Advertisers

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Band Saw to Circular Saw — Instantly! A RUGGED, man-size, complete machine that ac- tually costs less then an out- fit of small, light machines. Big band saw with 45° tilting table — takes up to 6” stock. Lathe with 12” swing. 8” rip and cross cut saw. Disc joint- er and sander — 10” diame- One motor with 6-speed. Quick shift belt does “ all jobs. Write today for full information. SHOP-KING DIVI- SION, Outboard Motors Corporation, 1244 W. Ruby Ave., Milwaukee, Wisc. For Both Wood & Metal Working apy FOr Anyone. sus. prepare Deu, plant vu. 4 spawn, keep molat and give short simple atten- tlon as OUR DIRECTIONS TELL HOW. Grow in cellar, basement. shed or unused space. Hasil: INEXPENSIVELY done. Raise large, SNO WHITE, meaty, deliclous, REAL food value mushrooms. Begin with small bed, THEN EX- FAND. rill all space with beds In tlers. OVERNIGHT CRO! Year around production, ASSURED MARKET Passing tng, PROFITABLE a $ enterprise, Detaila frea. Wi INTER: A i full time, or pastime eceupation. Splendid HOME BUSINE: rite a STATE MUSHROOM INDUSTRIES, GS-7357, Cottage Grove, Chicago LEARN THIS NEW METHOD OF DRAWING. EVERYWHERE YOU LOOK YOU SEE CARTOONS HAVE YoU EVER WANTED TO CHARTS WITH COMPLETE INSTRUCTIONS FOR MASTERING THIS METHOD OF ENTERTAINMENT, COMPLETE IN A NICE PORT- FOLIO, SENT POSTPAID FOR GL00— JANES A. NICOLETTI” HL SAVE. ROOK LYN,” N.Y. Learn Public Speaking At home—lIn spare time—20 minutes a day. Overcome ‘‘stage-fright,’’ gain gelf-conBdence, increase your salary,* tbrough ability to away others by effective apasch. te now for free booklet, How to Work Wonders With Words NORTH AMERICAN INSTITUTE, Dept. 2052 3601 Michigan Avenue, Chicago, hwiois BE A POULTRY EXPERT Make $40, $50, $60 a Week Free book shows how to get started quickly. You'll be surprised at the amazing profit opportunities in the poultry business. Wherever you live—whatever you do—it is easy to start on a spare or full time basis. Free book tells all. Send for “How to Ralse Poultry for Profit.” You learn right at home in spare time by methods endorsed by colleges and leading poultrymen. Know how to get the maximum profits Irom interesting, healthy work. Tron-clad agreement protects you. We have prepared hundreds for good jobs and businesses of their own. Write now for free book. No obligation. National Poultry Institute, Inc., Dept. 413-U, 2005 {5th St., N. W., Washington, D. C. 63c in Po- SH SALES from ie enge AEG? GUTH Torment eve ioe se : a evel : fakes like wilde nog and loctte Yc, SHEE FACTS i eas WRITE oue Springfield, A 9 ae alo Co., 242-5. High St Long- 7 a o oo Ț Thank You for Mentioning Modern Mechanix and Inventions for February When Writing to Advertisers NO HOUSE-TO-HOUSE— Experience Unnecessary — No Costly Machine to Buy The new coast-to-coast food hit. You work at home, chips come to you all ready made. Simply drop into hot grease and they're ready to eat! No complicated work, -no experience, no failures! Opportunity to make up to $30 first day, and high as $60 to $300 week clear! Not a machine. No need to buy special equip- ment. Stores do your selling for you. A phenomenal success! Sells faster than potato chips, do-nuts. Magic Cheese Chips are big, fluffy, giant-size chips bigger than potato chips. Irresistible taste makes them act like an appetizer. The more you eat the more you want to eat-and you never get filled up! It’s a revelation! Crowds Maine to California devouring thousands of pounds weekly! You Don’t Invest a Red Cent until you have sold yourself on the possibilities. You must sell your- self first before we permit you to invest, and our novel plan enables you to decide without cost! Then you can start with $8.50 invest- ment, put back the enormous profits, building up without another penny + investment if you wish! Send for Actual Photo-Copies of Orders from Men, Women Starting at Scrateh— then ordering 50 to 200 Pounds Weekly—Pays Distributors Tre- mendous Profits. Men and women succeed alike. No supersalesmanship —no skill—no big investment—no canvassing. We furnish everything —advertising, display stands, etc. Don’t wait until it’s too late to get the FIRST BIG PROFITS in your locality. Write at once and share the enormous profits immediately! FLUFF-O MFG. CO. Dept. 1015-8, St. Louis, Mo. INVENTIONS THERE'S money and fame in inventions. But there are many essential things you must know in order to capitalize your talents. You can now acquire thls knowledge through spare- time study of the International Correspondence Schools’ new and practical course in Inventing and Patenting—just of the press, Ask for complete information. NEW NOW The Smash Hit of. the day! The big fad at parties, outdoor games, People everywhere munching ’em on the streets! Takes instant- ly. Biggest food novel- ty boom in years! Virgin Territory - Available Hundreds of successful businesses now operat- ing. Thousands of open territories. Hundreds of cities open—thou- sands of small towns. Immediate success pos- sible anywhere. Write today. © ee 2 Fer 2 ô = “INTERNATIONAL CORRESPONDENCE SCHOOLS Box 2318-V, Scranton, Penna. Please send full information about course checked: O INVENTING AND PATENTING D Chemistry O Accountancy O Radio D Advertising O Aviation D Electrical Engineering O Refrigeration O Drafting D Air Conditioning O Show Card Lettering C Architecture 0 Good English NGI EEEN E A IAA E E i T PCa. ONE E OA

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few ™ OIL HEAT Heats 1 to 38 Rooms CHEAPER than COAL NEW INVENTION! © Entirely new development of LACO’S sensational ‘‘Mineral- Wick’’ heating principle gives marvelously simplified burner at amazing low price—$18 to $27! 4 sizes... stove and furnace, Heats 1 to 8 rooms. Clean, safe, noiseless. Heats as well as $300 burner. Saves 25% in fuel costs. No electricity . . . no blower . . . no mov- ing parts. Merely turning valve (Under- writers-Approved) gives ell the heat you want, Fits right into ash-pit. Anyone can install. Backed by one of world’s largest oil burner manufacturers. TRY 30 DAYS WITHOUT RISK! Rush name for full” details.. Try in your own home at our rel Mone Back Gaarantes pros ta yot. er models and sizes choos from. Sead name for SPECIAL OFFER] LACO OIL BURNER COMPANY, @i.vcis"tows RADIO EN G | N EER I N G, broadcasting, aviation and police radio, servicing, marine radio telegraphy and telephony, Morse telegraphy and rail. way accounting taught thoroughly. Engineering course of nine months’ duration equivalent to three years of college radio work, School est. 1874. All expenses low. Catalog free. DODGE’S INSTITUTE Fern St. Valparaiso, Indiana for DEALERS--AGENTS Make high as $300 to $500 a month) Free burn- er offer starts you out. LACO has powerful sell- -Ing advantages. Lowest prices.: More heat from cheap. fuel, Money-back guarantee. Fullest factory cooperation, Nationally ad- vertised. Attractive sales literature. Thousands now making ble money. Why nol YOU? Write Today! Sample Copy of OPEN ROAD for BOYS Magazine, 60° pages thrilling. stories, ice tures, sports, mvatery etc. Free member- ship in WINNIT CLUB, badge button, big outfit, catalog and new plan for getting easy money and swell prizes, Big surprise, too? ALL FREE! No obligatlon. Write today to WINNIT CLUB 41 Open Road For Boys . 130 New bury Street, Boston, Mass. DOWELL’‘S Health and Strength Course An amazing NEW system of Health and Muscle Building that does not require the use of an apparatus or mechanical device to get the finest muscular development! .Nothing like it ever offered before. Builds you inside, as well as out! Gives you a real he-man development in a few weeks’ time. Results guaranteed! Sent C. O. D. or enclose $2.00 with order. RALPH E. DOWELL P. 0. Box 244 Grand Junetion, Colorado IF You will like “THE AMATEUI SCIENTIST.” YOU Intelesting, authoritative articles just the way you LIKE want them. Non-technical. Devoted to ASTRONO- MY, BIOLOGY, PHYSICS, CHEMISTRY, RADIO, etc. The ONLY magazine of its kind'in the world, Send 25e for a copy or $1.00 for a year’s subscription. Don’t delay] Write Now! “THE AMATEUR SCIENTIST” Shamokin, Pa. SCIENCE RAFTING = GET READY TOR PROSPERITY. Be ready for BIG PAY. I will train you at your home by mail on Practical Drafting until IN POSITION, or prepare you for BETTER PAY on the Job you haye,- All tools and drawing table ‘sent at once if you enroll now. WRITE FOR FREE BOOK. ENGINEER DOBE. 1951 Lawrence Avenue Div. 22, Chicago oath 138 Floating Airports to Link Continents (Continued from page 61) from the surface to the underdeck hangars. This specially-designed elevator will adequately handle planes with wing spans up to 120 feet. This flying deck will be supported in place by a number of ballast tanks sunk sufficiently below the water so that the flotation arrangement will be unaffected. That was the inventor’s pre- dominant problem, constructing his float so that it would not shift and toss with the huge waves. A truss system of anchorage will hold the: big deck by means of cables to a 1,500-ton weight on the bottom of the ocean. The truss-like arrangement will consist of twenty-eight buoy- ancy tanks floating far beneath the ocean’s sur- face. In turn these will be linked to the deck by. means of cast iron columns streamlined into an oval shape above the mean level of the waves and circular below. Columns 300 Feet Deep Underneath the buoyancy tanks these col- umns will continue downward a hundred feet to the ballast chambers which will be stabilized by iron ore. The complete column, including the ballast sections, will be over 300 feet in depth. Mr. Armstrong has taken advantage of a well- known principle in the construction of his ocean island. Ocean waves are surface disturbances only, while water in the depths is still. “A model of the proposed seadrome was con- structed and tested together with a model of the steamship Majestic, built to the same scale,” Mr. Armstrong said. “Under test conditions it was found that the seadrome.was unaffected by any. combination of waves up to and including those equivalent to 180 feet in height. The model of the Majestic on the contrary was practically swamped in waves exceeding 80 feet in height.” The engineers of the Seadrome Ocean Dock Corporation associated with Mr. Armstrong esti- mate that 125,000 tons of iron and steel will be required to erect five airports and anchorages. 30 Hours New York te London The seadromes will have radio stations and radio beams to guide the air-liners in inclement weather. Attached to each seadrome there will also be sea-going cutters of the Coast Guard type for emergency as well as auxiliary duty. The floating decks will have weather stations. At the present time the quarter section of a sea- drome is being constructed behind the Delaware Breakwater. When it- is finished early next sum- mer it will be towed out to sea for the tests. If it comes up to the expectations of its sponsors, the three other sections will be built and the entire seadrome assembled. In turn work will then be started on the rest of the ocean airports. Mr, Armstrong estimates that a 24-hour service can be maintained on the Atlantic Ocean, but he further modifies that calculation in plotting the trip between New York and London. He intends to make that journey a 30-hour trip in eight jumps of 160 miles per hour. Pe Thank You for Mentioning Modern Mechanix and Inventions for February When Writing to Advertisers

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Learn_the Secrets of this MYSTIC POWER Hypnotismisastrange,subtlepower that vep 8 yo a the key to the Inner Secre ind Control. When this wighty i Ig released, you can over- come ali obstacles; make people obey your commands: etrengthen your mem~ ory; develop a strong. magnetic person- ality; realize your aml bitions; banish fear Și worry; Increase your ealary; and be- come master of yourself, friends and ac- Guaintaneee—eltber sex. These magic: Be- grets are now revealed In 265-page book— “The Sclence of Hypnotiam.’? This marvelous book explains the theory ‘and practice of Hypnotiem; gives® stages of po Bronotizi ;tells how to select eubjects,how bealin: pnotizo ar pte a oa ‘dscussea meemeriom,magnetio ntal Most complete book published. EY arsar Eo badat et at once, Pey postman NO 21.98, plus postage. Batisfaction guaranteed, Franklin Pub, Co., 800 N. Clark St., Dept. 1203, Chicago pouen A STRONG : Booka Fifteen glorious minutes on Pandiculater better than two bours im ium. Refreebes, rejuvenates. Helps retain youth, energy» hz no discomforts dellektiully restol. Waite for tree Booklet, o io discomiort; deilig! ully restful! or ‘ee Hookle PANDICULATON CO., 643 Hanna Bldgs, Cleveland, Ohio BUILD THESE REDESIGNED C-D BEAUTIES! PRINTED - OUT WOOD PARTS feature these two Hits. See your desler, or order direct, Send 3c stamp 1930 Howard Racer Span 17%", length 12", weight | for new catalog Span 151 len. igth 19347", welgh 1931 Bayle’s Gee-Bee 1.402, Yellow and black, Com- | No. 1 1.302, All-white, Complete piete Kit SF-17B, only $1.75. SE-10B, only $1.60. S CLEVELAND MODEL & SUPPLY CO., Inc., 1860L2 West 57 St., Cleveland, O., U.S.A. BUILD YOUR OWN TELESCOPE Same type as 100’’ Mt. Wilson Telescope. Noexperience or special tools needed. We furnish complete set of in- structions and alk necessary materials at lowest prices. FREE Catalog on Telescopes, Microscopes, Binoculars, etc. With complete instructions for Telescope Making — 10c PRECISION OPTICAL CO., 991 E. 163d St, NEW YORK FOR YOURSELF PA INT SIGN AND OTHERS! NO LESSONS OR EXPERIENCE REQUIRED wareron WITH LETTER PATTERNS FREE SamPLES! J-F. RAHN, C2120 NEVA AYE., CHICAGO SMALL MACHINERY OPERATORS Our Catalog 17 contains engines and motors for gas, steam, electricity or water. They may be obtained complete or you can assemble or build them using our parts and castings. Model bollers, real miniature valves, fittings and machinery, just like those in the large power plants, but much smaller. You can hold some of them in your hand. Or also, engine modelmaker’s supplies. Send 25e for your copy of the new Calalog 17, Canada, 30c. Refunded on first order. We thank those many customers who have called on us this summer. If you ave not one who has had the opportunity of coming to Chicago to see our line, send for the new catalog. HOWARD ENGINE & MFG. CO. 2417 N. Ashland Ave. Chicage, Tl. Learn togra ph HOM Make money tal . e Make mon ve fear ng of pictures. Prepare quickly during. spare i timo pe Also ke ior APY? and full particulars, a hivesttnies est in MODERN Dept. 2052, 3601 Michigan Avenue Chicago, U» S, Ae so Thank You jor Mentioning Modern Mechanix and Inventions for February When Writing to Advertisers Rv y.V4! | Business Secret from HOLLYWOO OTTO K. OLESEN = A or nator of cae ror! ua Y WOOD. L of SPECTA: ACOLAR PUBLICITY LIGHT Gi. .. endorsed by Chambera of Com- merce of 17 cities] “ Business alwaye goes to the man with a Big New Idea.'} fonnd that out a few years ago. The bottom had dropped out of my own business) 1 had debts end no money, I was unknown. Then l tried out my New-Idea a3 S) ectacular Lighting. It it work: ed like ma a I made money the Orat month at new idea hag helped to BUILD A CI and make it WORLD FAMOUS] Chamber of Commerco Gnd errs leaders say so. And it has built my company into Ben ef he OPENS electrica) establish- ments in the Weet, ’... Spectacular Publicity Lighting Places Your Business Above Competition! You can ge, in, TSA prn what Mr. Olesen I SALESMEN! pam od T Californi PAATEVER YOU! o! lolly wi Balona, RESEN T OCC ATION, ou can start with ites Or no cal tale ay lesen did. His ex- The new, live, sslable elusive Idea Syetem is without competition, lt money-making feld furnishes its own publicity. $ Each Job done E America tod S own advertisement an rings © other j aes CULA SUBLIC! ioar solicitation, Use M lesen’s Idea TICETING It’s ensy... System and place your own business above all It’s profital Îe . . . it’a faa- elnating, Let me show you how to get a real job and how to make real money in the greatest business competition opportunity open to ambi- GET THE FACTS: lous men today. Read my This astounding business secret, this fasci- nating new way to make money on a bii waite for f Write for gbsorbinaly claas basla | that Bat e al competition, and whieh TOD actu 8 SUB d 3 to you, ls NOW ARST TIME to ambitious, men everywhere, No epeciab capital is needed. an He the first in your town to peneht by this opportunity. GET THE PACTS. «AT ONCE, The whole amazing etory Is told is Mr. Olésen'e ae Book. It explains everything, Send for it TODAY. Otto K. Olesen Illuminating Co. Ltd. DEPT. E-22, HOLLYWOOD, CALIFORNIA FREE BOOK TELS ALL Send for it TODAY | This adv. copyright, 1933, by Otto K. Olesen $200 first Week in OWN Business! L. A. Eagles tcok in $200 his first week. Harry Hill writes: “Paid for home with H-B Rug-Washer. Earned $86 first day.” H. I. Riley averages about $35 a day. C. R. Bergseih writes; ‘‘My profits run about $400 every month.” Many others mako $125 to $200 per week. C. While pays: “$100 business in 6 days—never a com- plaint.” Electricity does the work. Finishes rugs and carpets like new, on customer’s floor. A proven, perma- nent business of YOUR OWN. Write today for booklet. Reasonable down pay- Easy Terms ment — balance monthly. No shop necessary. Hundreds of customers in your vicinity and nearby towns. Backed by $58,000,000 Company. Used by the U. S. Government and Statler Hotel System. Every machine guaranteed. FREE Book Send today (no obliga- tion) for booklet illustrating Rug-Washer and tell- ing how you can earn large profits at prices below other methods; how you can build a permanent year- around business; and how you ean pay on easy terms. Enjoy a larger income. Mail a posteard or letter today.--Now. H-B co., 6252 H. B. Bidg., Racine, Wisc. pe- 139

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W LOW vue , me-+Go AR A owe ong tied Owes! PRICES ON Ear TIRE USERS by the thousande all over the U.S. A. vouch for the LONG. HARD SERVICE, under severest road condi-} tiona of our standard brand areal reconstructed NA SECRET YEA in history with 12 month guarantee. y Don't Delay—Order Today BALLOON Tires eS Size Rim Tires Tubes| sie” 'iresTubes $2.15 $0.95)3 iw $2.2 65| re baer bi io a ap aunowoul borer tetra} 38 2. 2 3. 3.. 3 3. 3. ww wns un WITH EACH ORDER TOn a TIRES Ee KE TIRE PRESSURE THRU m WALL OPTIRE PES O EUSS~NO DIRT CU WUW WWWNNNNNNNN CMNOSaAWUNUOULTEM vr ane 8 . D, uct! Sper cent if h in full i Sa ia nh elas ak ‘OR Bi wi o glve months’ ck replace r ky rice, TIRE & RUBBER CO., Dept. t- 3709 Pti KSE rove Ave. q AGENTS. Ssrrash Go Prices! Santos Coffee 12c Ib. 4-oz. Vanilla 812c. $1.00 size Tonic 14c. Razor Blades 5 for 832c. 100 sticks Chewing Gum 12c. 150 other bargains. Experience unnecessary Write CARNATION COMPANY MN-2 ST. LOUIS, MO. METAL-WORKING LATHE Precision equipment for the small shop. New designs and manufac- turing processes make this amaz- ing bargain possible. Complete metal-worlting lathe with compound sltde-rest, cgmbinatlon face-plate and independent chuck and tail center; 6’’ swing; Ce length; 20 lbs. Send $1.00, Balance plus posta: ge G. D. Lathe for wood- torning alone, H. chments or milling, grinding, sanding, saw- table, etc., available at low prices. Order from ad at once and have a completa machine shop. AMERICAN MACHINE & TOOLICO. 200 Broadway, Dept. X-7. New York Make Money at Hom our famous Fancy White Grau Gu Mushrooms. Experience un- necessary—we tell you how, Big de- S luahaoimna mand, at highest prices. Markeling BOR SHED facilities furnished. Tlustrat- a ed book free. Write today! AMERICAN MUSHROOM INDUSTRIES, LTD. = 332 Woolnough Bidg., Toronto, Ont. ToAny Suit! Double the life of your coat and vest with correctly : matched pants. 100,000 e ernan Every pair hand tailored to your measure, Our match sent FREE for your O, K. before pants are made, Fit guaranteed. Send plece of wl ROR MATCH: Pants COMPANY, 115 So. Dearborn St. t. 38 Chicago BUCHSTEIN’S FIBRE LIMB is soothing to your stump—strong, cool, neat, light. Guaranteed 5 years, Easy payments. Send for Catalog today. l. Buchstein Co. 610 3rd Ave. So. Minneapolis, Minnesota Also fibre arms, and braces for all deformities. Man Can Now Use Strange Inner Power New and Revolutionary Teaching Reveals Secret of Happiness and Financial Success Without Physical Effort The story of a new and revolutionary teaching which reveals a strange inner power so dynamic and force- ful that it can carry man to complete happi- ness, health and finan- cial success is told in a 5000-word treatise, “Key to Your Inner Power,” recently compiled by Yogi Alpha, inter- nationally known psychologist and phil- osopher. He tells of his discovery that all the laws of the universe can be controlled because the laws themselves depend upon the great universal mind for their existence, that every mind is part of this universal mind, and if you learn to use this universal energy it can almost over- night bring you everything you want without physical effort. He further proves that this power is not limited to a fortunate few, but is latent in every human being, regardless of training, education or environment. He convin- ces the reader that this secret key is so simple to understand and to apply that it is amazing that no one has found it before. The author offers for a limited time to send this amazing treatise to readers of Modern Mechanix and Inventions free of cost or obliga- tion. It reveals the astounding secret, which, mastered, can enable you within the next few months to increase your earning power, attract new friends and make your visions of achieve- ment, health and happiness come true. For your free copy, address Psycho-Logic Institute, Box 98, Dept. 8-D, San Diego, California. Oe p TED OF 140 Thank You for Mentioning Modern Mechanix and I nventions for February When Writing to Advertisers

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NEW FOUNTAIN BRUSH o Mites CLL GLASS 01 2 x 1 WITH LIQUID COLORS—as easy as a fountain pen.. Sim- plifies sign wrlting—uses Special Water Colors: Whlte, yel- low, blue, red, orange. Writes in upright or any position— ,& wide, mediam or hair line stroke. Designed to fit retailers’ need to. - Sell to Grocers, Markets, Frult Stores, Taverns, Bak- = erles, Used Car Lots, etc. 200 per cent profit, Repeat color bus- iness. Distributors, Salesmen, Crew Organizers wire or write for exclusive territories. 97 atates are open now. al assort- ment mailed for $1.00 maney order. 2000 E. 77ib St., LEJAY MFG. COMPANY, Chicago, IH. OWN A CARAMEL Pop-Corn Store o Make quick ‘success with CARMELCRISP .. . ‘uo. sensational new candied Pop-Corn confection. L. Stores going strong. Openings in many towns, Little capital, Weenpply complete equipment... hel finance andlocateyau, furnishstore plans, successful ori F nal formulas, teach procese. Send forFree.book, ' ‘Golden Hernelsof Profit. '’Explainaall. Writetoday. Noobligation. CARMELCRISP MACHINE CO., . 242 High St. Springfield, Ohio The Most Astounding n Trick Ca rds Pack Ever Invented Bewilder your friends. No skill or practice required. Many hours of amusement. All the cards are different but you | can compel the other fellow to take the same card every time. Send $1.00 for SVENGALI WONDER PACK, post- paid. Just one of the many sensational articles described | in our free catalog. : GUS JANSON. 132 West 65th St. New York Clty How to Cash-in | with Your CAMERA Magazines, ~. Newspapers, Advertisers, are BUYING 134,000 photos every week! Make good money — sparo time, full time—taking human-interest pictures that sell. Earn while you learn how to take salable Pictures! We teach you how by mall. fascinating, easy)? Our unlimited marketing service hel ou cash in ly. Write now, (no obligation), for FREE BOOK. " How to Mak bid „Money With Your Camera. UNIVERSAL PHOTOGRAPHERS Dept. 332 10 W. 33rd St. “WHAT MAKESITLIGHT Make Big Money Asking This Question MYSTERY CIGAR LIGHTER seue Entirely new princlple of ignition. It surprises, it amazes, lt sells like wildfre. No Flint or Friction. All guaranteed. Sample with Sales Plan 25c. Sample Gold, Sflver or Chromium Plated $1. Agents write ards, Stationery, Advertising, $5.90, Job Presa. $11, Power$149. Pays for itself in_a short time. Is} NEW YORH CITY for a real money making proposition. E NEW METHOD MFG. CO., Desk M-2, Bradford, ` Pa. | Tabels, paper, circulars. tage, ete, Save money and time, Sold direct Do popular raised printinglike en- graving with any of our preeges. Print YourOwn from factory only. . Junior Press Prini for Others, Blg Profits. Easy rules sent. Write for free catalog of outfits and all details. P The Kelsey ĉo.. K-9, Meriden, Cann. NAS § S a w ELECTRICAL BOOKS stupped A-C-RADIO TELEVISION ; EVERY ELECTRICAL SUBJECT COVERED Here's grent news for anybody interested in Electricity. BRAND NEW 1933 edition of Applied Liectricity brought right down to date with every NEW..Electrical subject fully covered. 10 big Volumes ‘and all shipped FREE for examination. RS BIG FIELD! Big Demand! = f Men who understand electricity Big Pay! are urgently. needed right now in thousands of industries. Autos, airplanes, machine shops— practically every industry dependa on electricity and men who know this subject male big money.. Pleawant, fascinating work, easy to learn and do: learn quickly with these books. Serd coupen for a get for FREE examination and sec for yourself. A year’s conaalting -membership in the: American Technical So- ciety now given free to all read- ere of this famous Cyclopedia of Experts Over 3000 weeny pages— hundreds. of Mustrations— the most complete » work of its hind ever published. namos, motors, power stations, radios, television, everything elec- trical explained clearly so anyone can understand them. Electricity. Many say,’*That’s worth more than cost of books,’ AMERICAN TECHNICAL SOCIETY Dept. E 2320, Drexe! at 58th St. Chicago —_——_—— ee ee eee ea American Technical Society, Dept."E 2320, Drexel at 56th St., Chicago Send for 10 daye’ freo usc, BRAND NEW 10 volume set of Electrical Engineering. In return for mailing thls coupon promptly, send free, certificate of membership In the American Technical lety entitling me to free consulting privile e for one year. Iwill pay the few cente delivery charges on the books. If I wieh | may return them in 10 days and owe you nothing, but if I keep them I will send $2.60 after 10 days, then $8.00 a month until the special price of only $29.80 iy paid. City š z State. -_________~. Attach letter stating age, occupation and name and address of employer and at least one business man as_reference. A FREE BOOK Develop your personal, creative power! Awaken the silent sleeping forces in your own conscious- ness. Become Master of your own life. Push aside all obstacles with a new energy you have over- looked. The ROSICRUCIANS know how, and will help you apply the greatest of all powers in man's ¥ f control. Create health and abundance for yourself. Write for FREE book, “The Wisdom of the Sages". It tells how you may receive these teachings for study and use. It means the dawn of a now day for you. Address, Friar S. R. E. : ROSICRUCIAN BROTHERHOOD San Jose (AMORC) California THE NEW AERO INTERNATIONAL ALL-WAVE 11 TUBE SUPERHETERODYNE DE LUXE $9 75 —Tutes $7.75 volume control. loud. speaker. eel! Thank You for Mentioning Modern Mechanix and Inventions for February When Writing to Advertisers Amazing Round the World Receiver With 2 matched dynamic speakers. 15 to 550 meters. Automatic ) Listen in direct to London, Paris, Berlin, Sydney, Buenos Aires and other stations throughout the world. Aero World Wide 1 Tube Short Wave Receiver For headphone operation—15 to 550 meters, With amplification can be used on For the last seven years this little wonder set has been one of the biggest sellers in the Short Wave Field. Write for complete Free Catalog. CHAS. HOODWIN CO., 4240 Lincoln Ave., Dept, D7, CHICAGO, ILL. Ipse 141

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NEW INVENTION E sms SAVES GAS ZRNE RECORDS dF Cuts Gasoline Costs KES as much as 30%— Fully Automatic Here’s what every car owner needs! The new VACU- MATIC — “The Carburetor That Breathes!” Functioning directly with the manifold vacuum, it automatically provides correct combustion and peak performance under all driving conditions. With it you get more power, more speed, quicker get-away, less carbon and smoother running. FITS ALL CARS Installed in a Few Minutes Present gas prices make the VACU- MATIC a necessity for gas saving. Increased prices are predicted. Install a VACU-MATIC and save the difer- ence.—Don’t wait. Write FREE E today for full informa- tion and details of our OFFE R FREE OFFER. VACU-MATIC CO., 7617-23 W. State St., Wauwatosa, Wis. AGENTS Make up to $15- ‘$20 a day; full or ppare time. Exclusive terri- torles. Write quick for full particulars. “The Carburetor That Breathes” 5 Master Keys Work like magic in emergencies or prove whether your door ur 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 with set. Each key different. LA VALLIERE, 75 FOURTH AVENUE, NEW YORK, N.Y. D AUTOMOBILE COMPASS Have you ever taken the wrong road and traveled many miles before discovering your mistake? This new AIRPLANE TYPE ¢ COMPASS constantly tells your direction of travel. Sticks to windshield. Base 1%” diameter. ONLY $1.50, POSTPAID. SAT- ISPACTION GUARANTEED or your money refunded If «returned within ten days. Agents Wanted! HULL MFG. CO., Box 246-A2, WARREN, OHIO PATENTS BOOKLET FREE HIGHEST REFERENCES PROMPTNESS ASSURED BEST RESULTS Send drawing or model. WATSON E. COLEMAN 724 9th St, N.W. Patent Lawyer Washington, D. C. WONDERFUL NEW INVENTION; SOLDERING IRON AND | _ BLOW TORCH IN ONE Pays for itself in one job! Needs no pump or pressure system — no stove— no char- coal—no separate blow torch. Burns an hour at less than 34 cent for gasoline, AGENTS? OFFER | Write forSpecialOffertoagents. | The Justrite is an ideal proposi- i tion for either main line or side : line — full time or spare time. JUSTRITE MFG. CO., 2047 Southport Avenue, Chicago, Ill, Fortunes in Needed Inventions (Continued from page 86) needed is a foolproof, slip-proof method of hold- ing stair treads in place. If the means for doing this thing can be sold in the five and ten stores so much the better. It should be borne in mind when working on this problem that the method used must not in any way mar the stairs or make necessary the boring of holes. Rack to Open Paper Bags Here is an invention which, if it were per- fected, would be a success almost overnight for the simple reason that the health departments in all large American cities would practically insist upon it. Store keepers, to open new paper bags either thrust their hands into them or else blow into them. Into these bags go the foods you eat. Why not a bag rack to hold these bags that would be so constructed that every time a bag was removed, it would be forced to open in such a manner that it would be instantly avail- able for filling. The device used could cost as high as five dollars and there is a market for about 300,000 of them. A total royalty of $200,- 000 should not be difficult to obtain in ten years. Device for Rubbers or Overshoes There is needed either a method of manufac- turing rubbers or overshoes so that they will not have a tendency to slip off at the heels.” Or perhaps a little device of some sort that can be sold from cards in shoe stores and that may be slipped into a rubber and that will prevent its easily slipping off could be made. Naturally this device cannot in any way damage the shoe and it should also make it possible for the rubber to be removed without difficulty. Pressed Metal Step Ladder í There is needed a design for a pressed metal step ladder that will be as light as a wooden ladder. Such a ladder would be worth at least $25,000 to its inventor. Vacuum to Blow Ashes Out of Chimney Some sort of a simple vacuum device that would blow furnace ashes out of the chimney while the furnace is being shaken and the ashes removed would be a big boon to home owners. Everything is ready for this invention and some inventor has only to put it together. Automatic Control Kettle for Boiling Eggs A special kettle in which to boil eggs that will have an automatic controlling feature, the eggs being held in a wire rack and lifted out of the boiling water after they have been immersed for a pre-determined period of time. This might sound like a hard nut to crack but it should be comparatively simple when one recalls that we have an electric toaster on the market today that does precisely the same thing and without any complication whatsoever. Electrically Driven Sidewalk Snow Plows We have electrically driven lawn mowers, why not electrically driven sidewalk ‘snow. plows? Papa always dislikes the matter of shoveling the snow but an article like this would merely need to be guided about. uae Thank You for Mentioning Modern Mechanix and I nventions for February When Writing to Advertisers

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Te for less than-4-cents a day NOW on 30-DAY TRIAL Deal Rirect Save 751072 New, FREE catalog shows how you can enjoy this new, 1934 Goldentone in your own home for 30 days FREE, Operates anywhere: home, car, boat, camp & from 6 or 82 volts without“ B? Make Money as | batteries. Long & Shori our agent. No ex-] Wave- models. prvience needed. 1 95 eal Com- . missions. Agent’s less sample FREE. tubes Write today. ved 92 stations Ņ =i many over 2,000 miles distant. : More proof in free catalog. One year guarantee, RGA licensed, Retails $25. Your price $8.95 less tubes. FREE Mail postcard or coupon. Ask for FREE, new catalog. r m= = == GOLDENTONE RADIO MFG. CO, “m m= = Dept. 2, 11706 Livernois Ave., Detroit, Mich. | Send me FREE catalog and agent’s is not an order). LENT ee ee eter eet eet E ee l | ADDRESS _. proposition (this l HIGH BLOOD PRESSURE Quick Relief, or You Only Pay When Satisfied If you suffer from High Blood pressure, dizziness, ringing in the ears, can’t sleep at nishts, feel weak and shaky, bad taste, nervous. if your heart pounds and you fear a paralytic stroke, to demonstrate Dr. Hayes’ prescription, we will send you postpaid, a regular $1 treatment on absolutely FREE TRIAL. While it is non-specific, many cases report remarkably quick relief; often symptoms diminish and normal sleep returns within 3 days. Contains no salts; physics, opiates or dope. Safe with any diet. PAY NOTHING UNLESS GREATLY IMPROVED. Then send $1. If not your report cancels the charge. Write Dr. Hayes Assn., 3168 Coates, Kansas City, Mo. NO JOKE TO BE DEAF EVERY DEAF PERSON KNOWS THAT George P. Way made himself hear, aiter being deaf for 25 years, with Artificial Ear Drums 4 his own invention. He wore them day and night. They stopped head noises and ringing ears. ‘They are invisible and perfectly comfortable. No one sees them. Write for hig Mane Moseli tear Also boobs ade ysel ear.” o book= let on Deafness. Address Ear Drum GEO. P. WAY, Inc., 741 Hofmann Building, Detroit, Michigan POSTERS—Pictorial Bulletins SEND FOR Advertising layout; commercial letter- ing; fashions; illustration. Individual instruction, Practical training. Write today for free book. Detroit School of Lettering, 2013 W. Grand Bivd., Detroit, Mich. Founded 1899. 5¢& 10% CORNER GOODS BIG P L MAKER Layman: BRAND Rs Call on dealers—demonstrate World’s greatest line Counter Card Goods: Aspirin, complete line Razor Blades. Mercurochrome, Peanuts, 65 big, new profit makers, Powerful, self-selling displays. Big profits for dealera and you, Permanent, repeating business. No investment to start. Send for Berpe FREE Catalog. WORLD'S PRODUCTS CO. Dept. 2814 LEARN NOW Spencer, ind. eo 5 sections, brass bound. Big 3ft. Telescope 10-mile range. Study y Moon, Stars and dis- tant objects with this powerful 8-x instrument. ‘Special eye piece for viewing Sun included FREE. Makes an ideal Micro- pees Guaranteed. Big value. Postpaid $1.85. C. O. D. 5e extra. BENNER & COMPANY, T-75, TRENTON, N. J. Want a Big-Pay Broadcasting Job? If you have talent here’s your chance to get into Broadcasting. New Floyd Gibbons method trains you for the job you want. You learn at home in spare time. Fascinating course fully explained in Free Booklet, “How to Find Your Place in Broad- casting.’’ Send for your copy today. Give age. FLOYD GIBBONS SCHOOL OF BROADCASTING 2000 [4th St. N. W., Dept. 4B42, Washington, D. C. Thank You. for Mentioning Modern Mechanix and Inventions for February When Writing to Advertisers p A YOUR IDEAS Write today for FREE BOOK, HOW TO OBTAIN A PATENT and RECORD OF INVENTION—or send Draw- ing or Model of your Invention for Examina- tion. MAIL COUPON TODAY! Promptness Assured with Best Results MILLER & MILLER REGISTERED PATENT ATTORNEYS ` RA | 1638 Woolworth Bidz., Dept. B, New York 203 MILLER BLDG., WASHINGTON, D.C. Please send me your Free Book, “How to Obtain a Patent,” and your “Record of Invention” form. Ea WE DO OUR PART | Ask Your Newsdealer for the New 1934 HOW-TO-BUILD-IT ATENT POL ACHEK Laan full information YOUR IDEAS and literature REGISTER YOUR about. Patent. Protection with- TRADEMARK ey out obligation. REG. PATENT ATTORNEY PROE ENGWNEER | N: WHAT IS YOUR INVENTION? Send me a simple sketch of a model for AME. ws eee ene regarding you are M4 mark andimat upon. KE a INTERNATIONAL CORRESPONDENCE. SCHOOLS Box 2317-V, Scranton, Penna. Without cost or obligation, please send me latest in- formation on Railway Postal Clerk O File Clerk Post Office Clerk (J Stenographer City Letter Carrier CI Typist O 4th Class Postmaster O Rural Carrier NaMe oirun r E ceed E OTR Address ainiin a E AA T SATA STRENT? aa Ipee 143

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“HAVE LARGE. POSSIBILITIES. es COMMERCIAL: Delays are Dangerous in Patent Matters HE FREE BOOK shown here was prepared for in- ventors, to show them exactly what steps they must take to secure a PATENT. If you have an idea, you should send for this book AT ONCE. It will tell you ex- actly how an application for a Patent is made, what information you must furnish your attorney, and what steps he must take in order to protect your 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 possi- ble. Send at once for this book. After you get that, you’ll know exactly what to do to protect yourself. I Serve You Quickly and Secretly Anything you write me or send me is strict- ly confidential between us. All letters and drawings are kept in strong, steel, fire- proof files, which are open only to myself or authorized members of my staff. I 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. I have had years of ex- perience in Patent Matters. When you place your idea in my hands, I am in posi- ` tion to proceed at once to secure protection for you. My fees are reasonable, and, if you desire, I can arrange convenient terms of payment. IMPORTANT! Please understand that you are not under the slightest obligation in sending 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 pro- ceed or not as you choose, to make your ap- plication for a patent. eeeee CLARENCE A. O° BRIEN. Registered Patent Attorney 317-C Adams Bldg., Washington, D. C. (Practice Confined Exclusively to Patents, Trademarks, Copyrights) 144 Thank You for Mentioning Modern Mechanix and Inventions for February When Writing to Advertisers

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RECORD OF INVENTION BLANK : gee I will send you my | Record of Invention | (form FREE: This’ blank will enable you ito make a sketch of your idea in proper. form and have it wit- nessed in such manner that it may be of value to you as evidence should the occasion for i evidence arise. In my book, I tell you how te use this form to pro- tect your interests. We PATENT Free Book Telis How How your Patent Application is made; what kind of sketches or drawings are necessary; what other. papers must be made out; how the Patent Laws protect you; why it is important to avoid loss of time in My Location in Washington MEY offices in Wash- ington are convenient te getting: your application filed; and many other important points. Even the Patent Office, and I and my assistants can, therefore, appear prompt- ly before the officials and Examiners. Reasonable Fees and Convenient Terms I have served thousands of inventors in all parts of the United States and I am able to serve you very rea- sonably and extend liberal terms of payment. So don’t waste valuable time. soc Thank You for Mentioning Modern Mechanix and I nventions for February When Writing to Advertisers a very.simple idea, if new and useful, may prove very valuable. You may have much to gain and nothing to lose by sending for this book TODAY. CLARENCE A.OBRIEN RE OISTERED PATENT ATTORNEY 317-C Adams Building WASHINGTON, D.C. | Please send at once your FREE book, “How to Obtain 1 ' a Patent” and your “Record of Invention” form. : Ld I Name toners enemas ied iata n ees Rage ewe paw ee ot Ld ! Address 5. ¢520458 5 KaAw Ge ouran EAR RS SESE RES ' H ' 4 (Be sure to write or print name clearly) : me nm ne eee ee ae a ee n e o

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HUNDREDS Have ALREADY Won Big.Cash Rewards D. BEEMER-MICH. | Now-100 MORE | Would YOU, T00, like to 2 or Buick Sedan & $1,000.00? De YOU want money? —a small fortune? — $2,500.00 in real Cash? Here’s your oppor- tunity! And not one cent of your money is required now or ever to win it. This is our sensational new way to advertise. We want people everywhere talk- ing about our company quick. So we are giving away thousands of Dollars — real fortunes — 100 cash prizes totaling over $5,000.00 — besides thousands of dollars in Extra cash rewards. Every- body can share in these cash rewards. Wouldn’t you, too, like to win a brand new Buick Sedan and $1,000.00 (or $2,500.00 all cash)? Can YOU Find 4 Dogs in Picture at Right? Some are upside down. Some sidewise. Can you find 4 dogs? Mark the dogs you find, clip picture and mail quick. Hundreds of people have won thousanda of dollars in cash rewards in other advertising campaigns con- ducted by men in this big company. Above area few. Now comes your chance. Maybe this great opportunity sounda like a dream to you, but I'll be happy to send you the $2,500 or Buick and $1,000.00 the minute youwin it. Not a Penny of Your Money Needed All these prizes are being given outright to win- ners. Not a penny of your money needed to buy anything. Nofa lottery. No luck or skill needed. Nothing to write. Imagine the joy of receiving a letter from me with $2,500.00 in itl Oh, boy, what a thrill! Hurry — get started quick by finding 4 dogs. Nothing for you to lose. You Are SURE to Win a Cash Reward if You Do as I Ask You are absolutely GUARANTEED to win a cash reward if you take an active part. But hurry! First active, first rewarded! Think of all the happiness $2,500.00 can bring youl We are reliable! I invite you to look us up through any credit agency, any bank in Des Moines, any business house, railroad, express company, maga- zine, newspaper. . . sWe are well known national advertisers. $1 0,00 0o REWAR We will pay $10,000.00 forfeit to any worthy charity if anyone can prove that we do not really give away all these thousands of dollars in prizes— or that all this prize money is not in the e ii 146 291/93 700 90||$2,565 h NYSTROM-ORE, antee we make. HELEN SHICK = PA. Cash Prizes Being bank waiting to promptly pay ev- ery prize winner— or that we will not fulfill every guar- NOW IN BANK All the thousands of dollars to pay į} every prize winner is now in the big, A strong Bankers Trust Co. bank in Des Moines. We are a big, re- sponsible firm. = $1,000.00 EXTRA FOR PRCOMPTNESS I will pay First Grand Prize winner $1,000.00 extra just for promptness—a Buick and $1,000.00 (or $2,500.00 if all cash is preferred). Do you want it? Then hurry. Not only one person, but hundreds will win cash rewards. In case of ties duplicate prizes will be given. MAIL COUPON QUICK Just mark the dogs you find, clip picture and mail quick with coupon below — or write on a penny post-card how many dogs you find. Don’t send a cent, For replying I will tell you how you may share in thousands of dollars in EXTRA cash rewards and win $2,500.00, too. An- swertoday. NERS SEER See eee eee T ell me E Merrold Johnson, Prize Meneger, which you B Dept. 331, Des Moines, lows. I have found 4 hunting dogs in your picture and I Bea anxious to win, desire to win=$2,500 all cash or Buick and $1,000.00? Merrold Johnson, y Prize Mat, M city... 0.2... secesqeegeeeser eens "Stato... Dept. 231, a (Mark in square which you_would prefer to win.) DesMoines W Ò Buick and $1,000.00, or O $2.500.00 All Cash. Iowa att LT tet T J] ilgos Thank You for Mentioning Modern Mechanix and Inventions for February When Writing to Advertisers

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Pays Bio CASH Prices /~ oD Will pay up tob $80.00 ey) mazing Profits for those Tà who know OLD MONEY! There are single pennies that sell for $100.00. There are nickels worth many dollars—~dimes, quarters, half dollars and dollars on which big cash premiums are paid. Each year a fortune is offered by collectors for rare coins and stamps for their collections, The prices paid are amazing. ,,,4 of Numismatic Company, : Fort Worth, Texas. He has shown I PA I D $200 00 thousands how to turn old coins © : s into new riches. s = se to J. D. Martin of Virginia FOR JUST ONE COPPER CENT circulation. Today or tomorrow «valuable coin may rome inte your possession, Watch your change. Know what to look for. B. MAX MEHL “Please accept my thanks for your check for $200.00 in payment for the copper cent I sent Py you. 1 appreciate the interest you have given It Pays to Post Yourself on the Big Values this transaction. It's a pleasure to do business of Old Coins and Stamps wii i firm that kandi eaters ie you do. I Knowing about coins pays. Andrey naw of Tarii, w paid wish to assure you it will be a pleasure to me $900.00 for a half-dollar received in change. to tell all my riends of your wonderful offer A valuable old coin may come into your pos- for old coins.” Julian D. Martin, Va, kow ii Ore T onp Hew Wna. snot Huge Premiums for Old Stamps Some old stamps bring big premiums, An old This is but one of the many similar letters we are constantly receiving. Post yourself! It zs! 7 i j j Jay, Y. z 10¢ stamp, found in an old basket, was re pays M W i paid, Mr. Manning, New y ork, CLRID cently sold for $10,000.00, There may be valu- $2,500.00 for a single silver dollar. Mrs. G. F. able stamps on some of your old letters, It Adams Ohio received $740 00 for some old will pay you to know how to recognize them, coins. We paid W. F. Wilharm, of Pennsylvania, m $13,500.00 for his rare coins, T paid J. T. Neville, of Let Me Send You My Big Illustrated North Dakota, $200.00 for a $10 bill he picked up in cir- Coin Folder’ It Will Open Your Eyes! culation. In the last thirty y ars we have paid hundreds Use the Coupon Below’ of others handsome premiums for old bills and coins. Send the coupon below and 4 cents for my Large Ilustrated s 2 Coin and Stamp Folder and further particulars. Write today All Kinds of Old Coins, Medals, "e for this eye-opening, valuable wealth of information on the Bills and Stamps Wanted profits that have been made from old money, No obligation on $1.00 to $1,000 paid for certain old cents, your part. You have nothing to lose—everything to gain. It nickels, dimes, quarters, etc, Right now may mean much profit fer you. we will pay $50.00 for 1913 Liberty Head = nickels (not bafalo), FILL OUT AND MAIL Now! 3 $100.00 for 1894 dimes ee oe, JNN. R O ya TR a. Mehl Bldg., Hi bet 4 y z es ea tie SS Mint, $8.00 for 1853 quarters, no Co. Est. 31 yrs. arrows, $10.00 for 1866 quarters, no motto, $200.00 each for 1884 and 1885 Silver Trade Dollars, etc.etc. Big Cash Premiums for Hundreds of Coins Now Circulating There are literally thousands of old coins and bills that we want at once and for which we will pay big cash premiums. Many of these coins are now passing from hand to hand in END FOR IMPORTANT ee BLA Re NO, Rae eae See. Py he SO

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LONG NEEDED INVENTION SWEEPS COUNTRY A BUSINESS IN THE PIONEER STAGE, AS Pie. New AS Aik CONDITIONING, PAYING PROFITS COMPARABLE TO PROFITS MADE IN Early Davs oF RaDIO AND AUTOMOBILES INSTALLATIONS FROM $7.50 To $150.00 AND Up on Which SALESMAN MAKES $5.00 to $116.70 ano Up. This is a call for men everywhere to handle exclusive agency for one of the most unique business inventions of the past decade, To such men we say, “This is no doubt one of the most revolutionary money making inventions that has ever come to uttention.’’ To those who a “Is it some d ’ we say, emphatically, “NO! -knack, no trick filing idea—no new kind of adding machine—not a check pro- tector,” Instead, it is an invention needed by the ines as Well as the largest cor- poration and it has already saved countless thou- sands for the business firms which. have adopted it. AND, in IT HAS PAID THOU- SANDS TO T ALESMEN WHO HAD THE GOOD LUC kK TO BE THE FIRST TO SEE OUR NEWSPAPER HELP WANTED ADVERTISE- MENTS! ‘Think of it! One of these first men has already made over 1,000 sales—each of se sales paying a profit’ of $5 to $60—tru'y a fortune in profits on the 1,000 s hows $1,080 profit in 23 $ give him a profit of $4 we know this a great su out to cover. the entire count Men wanted every- where. Any mah, young or mature, who grasps Shis opportunity; may duplicate this su . The annual business should run into millio feelit will be worth while for every man who realizes the importance of this opportunity to telegraph, or rush by fastest mail, the coupon for our proposition. Still another's orders 0 in three months! Now —and now we are Saves Thousands of Dollars for Offices, Stores, Factories What is this remarkable invention? You have to see what it is, read all about it, what it has ac- complished, to believe it is possible, This as- tounding record of accomplishment is reported and verified over the signatures of many of America’s finest and most distinguished business houses. Large firms are not the only beneficiaries—small Each Installation Leads to Automatic Repeat Sales No need to go elsewhere, once you have sold every good prospect in town. You may stay w here you are and build up a permanent substantial I ased customer needs “refill” au make exactly the same Your Customer Takes No Risk Customer gets signed certificate guaranteeing cash investment. Very few business men are so foolish as to turn down a proposition guar- anteed to pay a prefit, with proof from leading concerns that it does pay. Protected by surety bonded national organisation. No Canvassing organizations are enjoying tremendous div lends, too. Sanders Ridgeway of Kansas invests $ 5 $4, 707.00 between Apr 5th and June 29th. Fox and Coal Co., Wiscons s $3,564.00. Baltimore 600.00 on $45 i ee We he "nah ten tions of the large size H. C. Heath writes, “We have already ula No Supersalesmanship Communicate with Us at Once If you have not already heard of this invention SALESMEN Sparking | Goods Ce ? talla- £ ui EVERY mly 13,000 yulation and I being sold in your territory, lose no time but tien. L, S. Warner Mer Co,, Texas, saves ove $1,000 nave already Roha 76 aent N E E D E D WHERE | get in touch with us immediately. This spe- on $1 installation, Safety Auto Lock Co., New York, tions, ma which repeated, YOU RISK NO MONEY cialty is as important a business opportunity today as the typewriter, adding machine, and- the dictaphone were in their carly days. Men who can take the measure of an opportunity will sce this instantly. If you can show us you saves $686.45. Wi th these and sults to display, our representa- business man, from the very small- in trying out this business. compie Training furnished. Every man with us today start- and the above units for your: tally every time you establish w der makes 128 milar r fal to tia ylangest, pooner n Cisnute Wie prootin a new customer, you increase ed at scratch, without previous | sre the right man H exclusive feanctiee in he phato-coples of actual letters wi nich our men show. yur ~, + ay riene any ¢ i our territory, your future is assure rite your permanent income | VESveMenes many COMME ont] Ye at once Uf writing, use the coupon below of clerking jobs, many out of small businesses, some out of large concerns. Can't possibly from repeat business. This informa- enables you, on exclusive con- V tract, to build an established, for convenience. No obligation. Full tion will be sent to you at once. Installed on Free Trial—Sells It- self — Saves Enough to Pay for Itself Before Salesman Returns We actually enable you to make installations at our » let the customer sell himself after the in- stallation is in andworking, This does away with the need for high pressure selling—it eliminates the handicap of trying to get money before customer is really convinced. You simply tell what you offer, show proof of suce in every line of business and every section of the country. Then install our invention without a dollar down. Tt starts working at once. In a few short days, the installation has tally pro- duced cash money that is there and available to pay for the deal, with profits above the investment coming inat the same time! You then call bark, collect your money. Think of it! Out of every business you do, neariy $60 is your own profit! The very smallest you make is $ AN on a $7.50 installation! Nothing is so convine as our offer to let results speak for themselves without risk to the customer! permanent route of customers which can be sold anytime like any other established business. A Business of National Importance As well as selling thousands of installations to small merchants, prof. onal men, etc., we num- ber the parent companies, branches, or dealers, ete., of world-famed concerns among our custom- rs: Cities Service OU C Great Lakes Fish- oe National Majes Radio, Chevrolet, Damascus Steel Products, Public Utili- $ Conse lidated Corporation, Union Gas Corp.. Coca-Cola Bottling Co., National Radio, Timken Silent Automatic Co. entral States Petroleum, United Aluminum Corporation. Street Railways Advertising Co., Great American Life Underwriters, N: tional Paper Co., and scores of others nationally known. Universities, news papers, doctors, etc,, buy substantial installations ‘and heavy repeat orders. tell you all in the limited space dyailable here. Mail the coupon now for full information—noth- ing to risk, everything to gain. F. E. ARMSTRONG, Pres. Dept. 4019-B, Mobile, Ala. l 'RUSH FOR EXCLUSIVE ` TERRITORY PROPOSITION i zA E. ARMSTRONG, Pres., Dept. 4019-B, Stobile. Ala. Without obligation to me, send me full information on your proposition, pr ame Strect or RAEE Ez No.

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uble Page Spreads

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AND OTHER | OME of the world’s most suc- cessful inventions came from men who didn’t consider them- selves inventors at all. The tele- graph was invented by a painter; the typewriter by a farmer; a poet fig- ured out the sewing machine; a school teacher the telephone; a bank clerk the hand camera and a dentist the stock ticker. Or look at small inventions: A husband noticed his wife bending a hair pin to make it stay in her hair. That gave him the idea of the crinkly hair pin, which he proceeded to patent. One day a golfer got the idea—just a hunch —to make a wooden tee. He patented his idea—and every golfer knows that wooden tees are suld by the millions every year. These are but a few of many similar examples in inventive history. That is why we say that the book shown on the next page is for INVENTORS and Other Men with IDEAS. Some men make a busin of invention. They make their living—even fortunes—that way. Other, men who are not inventors at all occasionally have good, practical ideas which could be patented to their profit and with benefit to the world. Whether you consider yourself an in- ventor or not—if you have a good idea; an idea that will save money, save time, save labor, make money or give pleas- ure—you should at least find out how you can protect your rights to it. And this interesting, new FREE book, PROFIT PROTECTION, will tell you. Little Ideas May Every year thousands of patented new ar- ticles are brought on the market—the result of someone’s happy thought. Often it is these little, simple ideas—the kind you find on the Read What C. F. KETTERING Vice-Pres., General Motors says about Invention Sometimes we hear people say: “Well, there isn’t must left to invent.” But Charles F. Kettering, Vice President and Head of Research of General Mo- tors, who helped develop the self-starter, Duco, and many other outstanding in- ventions, doesn’t: think that at all, He thinks just the opposite. In an inter- view recently published in Good House- keeping Magazine, Mr. Kettering said: “If we took half the men employed in tool making and put them to work- ing out new inventions, new things, we could snap out of this depression in no time. Our return to normal times de- pends on new manufactured products that will catch the purchaser's eye, get him to buy and thus start the ball roll- ing. Change and buying go together. We're only entering the great period of inventive advancement.” Have Big counters of a 10¢ store like the one shown here —that are among the most cuccessful financially. Whether your idea is simple or comples—targe or small—if it 1s new and useful, you owe it MEN WITH IDEAS Our Business Is to Help Inventors For thirty-five years, this organiza- tion has been in the business of helping inventors. During that time ideas—in- ventions—from literally every corner of the country have been turned over to us to protect. Some of these ideas have represented large and complicated mechanisms; many others have been very small, practical articles, like a can opener or a new toy. All this has given us a wealth of esperlence which we place at the use of Lhe inventor of today. What you write us is held in strictest confidence. Here in Washington, near the U. S. Patent Office, we maintain a large staff of expericnced Patent Spectallsts, Draftsmen and Specification Writers to give you prompt and competent service. Yet because we know how to work efficlently—our fees are low; and if desired we are in position to help you with a plan of deferred payments. Delays Are Dangerous— Write Us Today In inventive matters, delays can often prove very serious. It frequently happens that two or more inventors will be working on substantially the same idea without each other’s knowledge. And the Patent Office rules tend to favor the man who gets his Patent Application on file first. So if you have an idea—YOUR VERY FIRST STEP is to find out exaclly what to do to protect yourself, That 1s a step you can take today—right away in fact—by sending for your copy of PROFIT PROTECTION. Commercial Possibilities | to yourself to find out how you can protect it. Send for a FREE copy of the book, “Profit Protection” NOW. VICTOR J.EVANS £ CO. H This Book TELLS YOU: How the Patent Laws protect you and why, if you have a good idea, have proved successful you need a Patent at and illustrates impor- all. tant mechanical princi- What to do to make ples that inventors fre- Tells you about in- teresting inventions that application for a Pat- ent; just what informa- tion a Patent Attorney needs to help you. What kind of a sketch or model is needed. What simple steps you may be able to take right away to help establish your right to your idea, even before you make application for a Patent, How some successful inventors have secured financial assistance to help them in the de- velopment of their ideas. quently use in working out problems. PROFIT PROTEC. TION is much more than a book about pat- ent procedure. In it we have put the kind of in- formation that we know from long experience the average man with an idea would like to have. The very same day we hear from you—a free copy of PROFIT PROTECTION will be placed in the mail to you. Sign and send the coupon. Get that y IMPORTANT | With this interesting book, you will alsofinda “Record of Inyention’’ form, which makes lt easy for you to sketch and describe your idea as a matter of record, This is an impor- tant step if you haven't taken it already. The book will tell you how to use this record’and why. It also comes toyou with- out any charge or obligation. Tonight Have this Colipon'i n the ¥Y-—"~ MAIL to WASHINGTON Ah Other Offices: 1640-B, Conway Building, Chicago Woolworth Building, New York; 828-B, Fidelity Philadelphia Trust Building, Philadelphia; 514-B, Empire Building, Pitts- burgh; 1010-B, Hobart Building, San Francisco. I am interested in your book, PROFIT PROTECTION and your Record of Invention form. Please send both of them FREE and without obligation on my part. pil VICTOR J. EVANS & CO., MAIN OFFICE: 605-B, VICTOR BUILDING, WASHINGTON, D. C. Name a r ? 3K : ; kinita Street and No. City or Town 605 B-VICTOR BLDG, WASH. D. C on mpe 26 Thank You for Mentioning Modern Mechanix and Inventions for February When Writing to Advertisers wc ane Thank You for Mentioning Modern Mechanix and Inventions for February When Writing to Advertisers D7

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“President “ROOSEVELT’S As a boy President Roosevelt wanted to be a sailor, but his father sent him to Harvard. He enjoys sailing cruises with his sons, Here is an intimate pose of the President eat- ing food cooked by himself on one of his vacation cruises, When storms toss the Ship of State, the President finds diver- sion with his great col- lections. Modern Me- chanix sent James N. Miller to the White House for this story of the nation’s gteat hobbyist. Sailing is the President's favorite sport and his love for the sea is represented in all his hobbies. Above is a photo of the “Amberjack II”, 45-foot sea-going schooner, in which he took a leisurely vacation cruise after his election. by JAMES NEVIN MILLER A SECRET service agent rapped on the door of the home of a retired minister in a suburb of Washington. The clergyman opened the door. The government agent flashed his badge. Tim- idly, perhaps apprehensively, the minister asked the man to step into the living room. Imagine his astonishment when the agent announced: “Your Reverence, the President would like to have you drop in some day at the White House. He’d like to see you about your stamp collection. He says that you should bring it along so that he can take a look at it.” The clergyman, noted for his stamp col- lection, relaxed and excitedly replied that he would be delighted to come “whenever convenient for Mr. Roosevelt.” THE FIRST COMPLETE STORY OF THE NOTED 30 Modern Mechanix and When the day’s work is done at his desk in the White House, the President often turns to his stamp collection. He is a philatelic fan with 20,000 stamps in 30 volumes. This anecdote is just a sidelight in the life of the nation’s chief executive, but it adds to an understanding of the character of the President of the United States. To understand great men thoroughly one should know their avocations, their hob- bies, the diversions that occupy them in their leisure time. The Prince of Wales, in addition to golf- ing, horseback riding, and dancing, knits and crochets. He claims that knitting rests him when he is tired. Henry Ford is fond of collecting old buildings, furnilure, and vehicles. Andrew Mellon is known as a collector of paintings and rare books. Sits in Bed Pasting Stamps President Roosevelt might be cailed the nation’s leading hobbyist. When the troubles of the country bear heavily upon \him, the chief executive is able to forget his worries among his great collections. Sometimes far into the night he will sit in bed pasting stamps in albums. Stamp collecting is only one of his hob- bies. Love for the sea seems to dominate all his pastimes. His collection of naval books, engravings, paintings, pamphlets COLLECTIONS OF OUR Inventions for February HOBBIES Esclusive Modern Mechanix Photo The “Raleigh,” early American war vessel, is one of the prized models in the President’s collection. The models are part of a greater collection that is a realistic history of the heroic and stirring events of the United States Navy. and ship models is considered the finest in existence in private hands. Except for official reports and docu- ments, it is possibly superior to that in the Congressional Library. It consists of -be- tween 6,000 to 7,000 books, approximately 10,000 pamphlets, 450 framed lithographs and etchings and more than 60 paintings. CHIEF EXECUTIVE 3L

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Numerous Famous Naval Historical Paintings Grace White House Walls Exclusive Modern Mechanix Photo This model of the whaling ship, “Josephine,” of New Bedford, is built true to scale and is complete in all details. It is one of the prized models of the President. When the President goes to sea in a sail boat, he hand!>s the helm him- self. He returns happy, tanned, and rested as shown above. At left is a glass case in Mr. Roosevelt's study containing eight mocels, Top row, left to right are, model of a whale; “La Provence,” French liner; sword- fish madel. Middle—The “Malcolm L. Cropley,” early American brig; and the S. S. “Olympic.” Bottom— The Pilgrim Mayflower; the S. S. “Mauretania,” another Mayflower model. The President himself has supervised the designing and build- ing of many of his models. He has built miniatures of every home in which he has lived. His stamp collection consists of 20,000 stamps and 30 volumes, one of the largest in the country. While governor of New York, Mr. Roose- velt kept his favorite Navy collection in his Hyde Park, N. Y., and New York City homes. His study, the library, even the halls and part of the staircases were almost covered with some of the finest known paintings of American ships. At his Hyde Park estate he kept most of his favorite ship models. All of these mod- els were made by hand and in most cases each is a perfect reproduction of an original ship. These wonderful miniatures are worth thousands of dollars. Together with the paintings and litho- graphs these models give a graphic and 32 —— Exclusive Modern Mechanix Photo vivid history of exciting and heroic deeds of the American navy. Upon becoming President, Mr. Roose- velt sent for only the best models and paintings. Yet there was a sufficient num- ber to decorate three rooms of the White House: the President’s bedroom, study, and office. None but Mr. Roosevelt’s most intimate friends are permitted to visit the bedroom. The study on rare occasions may he seen by authorized persons. The writer was given permission to visit the White House, and take along a photographer to view and photograph the President’s hobbies. Incidentally, before describing these col- lections, it would be best to reveal another interesting angle concerning the President Modern Mechanix and President Roosevelt Designs and Builds Many of His Own Prized Models Above is a glimpse of the study on the second floor of the White House where the President often confers with foreign’ en- voys. It is furnished with the most prized models and naval paintings of Mr. Roose- velt’s collection. Modern Mechanix arid Inventions’ correspondent gives a desctip- tion of the room in the accompanying article. At right is one of the models. It is a full rigged frigate, war vessel of the Revolutionary war. Hand-made in every $i Particular, the model is worth thousands of dollars. and his avocations. The President’s mother revealed that, not only does he collect mod- els, but that he also enjoys supervising the designing and building of models of both ships and houses. Every house in which Mr. Roosevelt has lived has been reproduced, under his super- vision, in a miniature model. The Presi- dent himself, his friends say, has built many models of houses. Painting Saved “Old Ironsides” Shortly after his election as governor of New York, he personally constructed an ingenious little model of the governor’s mansion in Albany. He has also ingeniously built tiny models of cottages at the Warm Springs, Ga., sanitarium. Returning to the White House—just back of the President’s desk im his study is a remarkable group of paintings of early American ships, mostly men o’war. One is the famous original painting of the Con- stitution, by the noted American artist, Gordon Grant. This is the painting that saved Old Iron- sides, noted for her distinguished victories in the Revolutionary War and the War of 1812, from becoming a loss as a treasured Inventions for February =) | a historical ship. In 1925, it will be recalled, Congress authorized restoration of the Con- stitution, but appropriated no funds for the purpose, To save the old ship it was decided to raise the money by private contributions through the sale of copies of the painting in Mr. Roosevelts possession. Approxi- mately 4,500,000 school children contribut- ed. In all $725,000 was raised and now the Constitution, completely restored, is paying her respects to cities on the Pacific coast. Another famous painting in this group shows the loss of the Kearsarge, well known Union man o’war of the Civil War. She was one of the earliest of Uncle Sam’s steam war-sloops. The Kearsarge earned her place in American history by her vic- torious battle with the Confederate steamer, Alabama, off Cherbourg, France. The White House painting shows the famous ship some years later, sinking after being wrecked on Roncador Reef, in the Gulf of Mexico. (Continued on page 121) 33

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Seth Parker’s Sunday Meeting a Seth Parker has loaded“ his ship with ammunition to bag jungle animals. Over the seven seas Seth Parker is seeking monsters of the deep, buried treasure and wild beasts. Here is the story of his world cruise in a windjammer, a boy’s dream come true. by ALFRED ALBELLI O-HO, me lads, yo-ho, by gosh! Here we be a-tryin’ to take a chaw agin’ the wind on the sleek schooner “Seth Parker” on a latitude “somewhere” en route around the world, with the famous radio star as the skipper and a rip-snortin’, puddin’-headed, home-spun crew to do the chores. Seth Parker, as ye all know, is neighbor Seth from old Jonesport, Maine, who used to have the Sunday night socials where the folks got together singing hymns and hav- ing a grand gab fest. The NBC radio station in great big New York eaves-dropped in on these meetings and city dandies got to snickering over goings-on in Jonesport. But Ma and Seth Parker, a cheerful, homey couple, put Jonesport on the map and did as much for their home state as Rudy Vallee and his stein song; by cracky! Offers to Take School Chums Back in ihe days when Seth Parker, whose name is Phillips Lord in real life, was in high school, he promised a few of his chums that if he ever became wealthy he would take them all on a cruise around This four-masted schooner, “Seth Parker” is taking the noted radio. star around the world on a cruise of adventure. The interior of this windjammer has been refurnished entirely with modern conveniences to satisfy the ship’s crew. 36 Modern Mechanix and Sails for World Adventure. the world in a real sailing schooner of bygone days. Fame and money have come to Seth Parker through his homey Sunday night Yankee broadcasts. Phillips Lord is keep- ing his promise. After much searching, he found a fine old four masted schooner. He bought the ship and named it Seth Parker. Then he set out to get a crew who knew the difference between fore topgallant braces and flying jib booms, spanker sheets and main sheets; men who knew their sails and riggings. Old salts who had sailed before the mast of windjammers were hard to find, but at last Seth Parker rounded up enough to man his schooner, only to find that rough going was still in the offing. The men coul handle the ship, but they did not want the forecastle bunks, the mess table, and the salt pork of the old days. Crew Wants Modern Luxuries They wanted modern conveniences, Be- fore he could set sail Seth Parker had to install an electric lighting system, electric refrigerator, air conditioning, and other up- to-date luxuries that appeared out of place in the old schooner. The crew was satisfied and Phillips Lord notified his old pals he was ready to keep his promise. Here another hitch came into his plans. The friends notified him that their wives would not permit them to go. Without his pals Seth Parker put out from Portland, Me., in his remodeled wind- (Continued on page 134) “Ma” and Seth Parker in charac- ter will enact their Sunday Yankee socials during the world cruise, Seth Parker’srealname |, is Phillips Lord. The old fashioned New England parlor that forms the background for Seth Parker's famous hymn and gossip socials. The entire cast has been taken on the world cruise to continue the weekly broadcasts by short wave from the ship. Inventions for February 37

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The monorail car above kas.just been de- veloped in England‘ to provide fast trans- portation as a substitute for street car sys- tems. Driven by propellers fore and aft this monorail developed'a speed of 100 miles an hour in: a demonstration near Glasgow. Guide rail pre- vents side sway. Conorail Car to This German monorail will revolu- tionize rail transportation. At 300 miles per hour it will meet the chal- lenge of the air transport lines. Fe noes may challenge the increased popularity of air travel by developing a superspeed monorail car. Balanced by gyroscope and eontrolled by radio, the gyroscope monorail would be capable of more than 300 miles an hour, its inventor claims. The gyroscope, not a modern invention, has only recently been applied to transpor- tation. It steadies ships in storm tossed seas. It aids in the automatic control of airplanes in. flight. Applied to rail transportation, the gyro- scope will permit much greater speed with- out sacrificing safety. In fact, Raymond C. Buchardt, engineer of the Telefunken com- pany, of Germany, who designed the gyro- scope monorail, claims his superspeed car provides greater safety than is now possible. Car Stands Upright on Monorail Buchardt’s monorail has all the latest de- velopments in streamlining and makes use of: airplane features to guide the car on its single rail. The gyroscope monorail stands upright on its single rail, while present monorails are suspended from the rail. The gyroscopes are used to balance the 42 Engineer Buchardt’s improvement over the English mono- Tail. is shown above. For street transport systems large steel structures would be unnecessary. Gyroscopes would. elimi- nate a guide rail to stop side sway. Greater speed is possible. car on this single rail. They do away with the side sway that would be present were great speeds attempted with the suspended monorail, Radio Will Replace Block Signals “Because of the terrific speed of more than 300 miles an hour, the ordinary block signal will be impossible for the trans-con- tinental monorail,” said Mr. Buchardt. “Signals would not be visible and in fog, rain or smoke the vision of the pilot would be entirely obscured. “To meet this difficulty I propose to use the radio to transmit signals and orders to the pilot just as transport planes are now controlled. Radio messages from a dis- patcher’s office would tell the pilot when to slow up and would warn him of any dangers ahead.” The. enormous air pressure created by the great speed would throw an ordinary ear from the rai]. Buchardt has solved this problem by designing a long, sloping curve Modern Mechanix and ‘Gravel 300 PILOT'S CABIN RADIO ANTENNA FORWARD Above is a cross section of the cross country high speed gyroscope monorail designed by Buchardt. iles an DRIVING PROPELLER a) The 300-mile-an-hour gyroscope monorail is shown in-the artist’s drawing above. The long forward sloping planes hold.the car to the rail. Radio signals would guide pilot. | on either side of the car, which he calls a “wind catcher.” The air pressing against this “wind catcher” would hold the car on the. rail. In his experiments with his invention, Buchardt found that the monorail would have trouble taking curves. The car took the curve perfectly, but the centrifugal force nearly threw it off the rail after com- pleting the curve. For that reason stabilizing fins were placed at the front and rear. of the car along with a large rudder. The forward fin also houses the radio antenna. The-gyroscope car is driven by two large propellers at either side of the rear end of the car. One gyroscope would be housed in Inventions for February This latest railroad car design follows the streamlining used on the gyroscope monorail, This English rail car attained a maximum speed of 60 miles per hour. the forward end of the car and the other in a rear compartment. Power would be sup- plied by Diesel engines. The rail used would be round and the wheels curved in such a way as to form a ball link. . The traction system type of monorail would be much smaller than the car used in cross country runs. The latter would be a double-decked car with the pilot housed in a third deck forward. , The trans-continental type would carry approximately 100 passengers. 43

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SOUTH ‘POLE Broadcasting For the first time the world can listen in to the thrilling, dangerous adventures of sixty men on the frozen continent at the bottom of the earth. Here is the complete story of this. outstanding radio feat. Admiral Byrd, bundled in furs, will broadcast his flight over the South Pole. The rifle will be part of emergency equip- ment carried in case of forced landings on barren Antarctica. 46 The ice breaker, “Bear of Oakland” (above), will be the first of Byrd’s ships to reach Little America, where the expedition’s largest radio station will be established. ISTORY, adventure, thrilling explora- tion—all these will be enacted at the bottom of the earth when Admiral Rich- ard E. Byrd makes a double conquest of the air. Over the great swcep of pack ice, the lofty frozen peaks of Antarctica, a giant airplane will roar through a leaden, for- “bidding sky on another major epoch in the field of aviation. Rescues to Be Broadcast In the cabin of that plane, a band of dar- ing men, every nerve tense with the excite- ment of hazardous adventure, will bring to the rest of the world, seated cozily in the comfort of home, a vivid description of the bleak icy wastes of the polar regions: For the first time in history the South Pole will go on the air in regular radio broadcasting and the world will hear the words: “This is Admiral Byrd: spěaking: to you from the South Pole.” His airplane’s little 100-watt station will 7 Modern Mechanix and -Admiral BYRD Speaking! 8 K\cio00 W. TRANS) E AMERICA eae W TRANS IN Sw SOUTHY 100 S POLE EENG ANS= ANTARCTICA MITTER Jr UNEXPLORED \ REGION SO! MAG! X POLE Little America will broadcast 10,000 miles to New York-with a relay sta- tion at Buenos Aires, as shown in the above map. The “Jacob Ruppert” will take Byrd to Weddell Sea for takeoff on polar flight, later flying to South Magnetic pole. Only shaded areas on inset map have been explored. send through the ether a program more exciting than the greatest football game, more thrilling than the pulse-stirring race of the finest thoroughbreds of the turf. Should that Giant Curtiss Condor trans- port plane be forced down and Byrd and his men face death in the unexplored reaches of the great South Pole continent, radio will carry over the air every detail of the heroic rescue attempts. Each of the sledge parties, pulled by the expedition’s 150 Canadian huskies, will carry a radio transmitter and receiver when it sets out across the Ross Ice Shelf from the base at Little America on the Bay of Whales. Every one of Byrd’s four other airplanes, including an autogyro, will carry radio equipment when it takes to Inventions for February Jobn Dyer, shown in the control room of station KJTY aboard the “Jacob Ruppert,” will be technical engineer for the Columbia Broadcasting Company in Antarctica. This 1,000-watt transmitter will be installed at Little America to broadcast Saturday night programs of the Byrd expedition through Buenos Aires to WABC in New York. 47.

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Something New under the Sun LOW OUT Certain shrill, 7 zning over the rado will extinguish a lighted SE Sta ee E E — Te ; ; old Sola Shot cannon balls trav- TolnA Otteriness, Chicago M. a or mone Zan gor if ve only WES BS d hi 4 Ball Pot Hi Goran, Tashi BC T An ra F ` 3 y / RWNMOKE CAN BE BLOWN OUTOF THE EYES !-7ztis corn Le aore by AVERY SIDE HAS A SOUTHERN E ; f POSURE IN THIS HOUSE 1-477 di- AN A 7 ARETES LA On De AoE rections would be south ifa SQuare : house were built at the north-pole, | x b Raymond wedord, St Johrshurg VE g i sages Trom the nose fo the eyes are sarge enough To allow smoke to pass through. — Theodore Risdill, Waterford, Ontario. On the surface many, odd facts that seem to defy natural law are easily understandable when the physical conditions back of the phenomena are known. Here are two pages illustrating facts that appear fallacious at a casual glance, but which are quite natural when all conditions surrounding them are considered. Remember Nic Sprank pays One Dollar for all scientific oddities acceptable to Modern Mechanix editors. What have you to offer for Nic Sprank’s pages of oddities? 52 Modern Mechanix and in Oddities of Science>"sprank E A [NIGHT AN ALCOHOLLAMP ZS pou AGENS RỌD— Upped i DOIRSSIUTL pEr- { E e SA LAR poor Cy Ig £ =” With waterand suipharicacia, [ese Reaction CAUSES OZONE, h- concentrated oxygeiz, » - Which lights alcohol: John Kakalec, Lk Ado, Pae THAN $20 GOLD PIECE! Oz Mog. / Federal Reserve enk officials tiled gold Coins are wathony the a, amount of gold they LESS ELECTRICITY! Wher the armattire OT Ta ¢ . is taming fast: it generates 2 back current anon Tork AE ZA teks bach the tnjut current Litis does tat ` PE NAT Ae rate. evolves sioniy:.— } ee A E Man IS WORTH 92 CENTS!~ Broken into elements; the body of man would yield lime, sugar cabon, iodine, water, as; Salt, and iton that coulda be valued. at only 82 cents, —Sorton Harris, Frooklyr, These strange facts of science may bring to mind some of the things which on every hand refute some of the accepted notions about nature. ONE DOLLAR will be paid you by Nic Sprank for every Oddity he considers good enough for these pages. Try your luck! Send in something new—don’t re-hash the obvious, and your chances of getting a dollar bill are as good as the next man’s. Address Nic Sprank, care Modern Mechanix, 529 South 7th Street, Minneapolis, Minn. Inventions for February 53

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tove Top Oven Among New “What won’t they think of next?” the surprised householder asks as a compressed air toothbrush is added to the month’s discoveries. Air BRUSH FOR TEETH ee A brand new idea in ovens is one which fits the indi- An air gun which sprays the teeth with compressed air and carbon dioxide has been introduced in England at South Kensington, where dentists of the right little, tight little isle recently convened. Pressure and chemi- cal action do the work. The action is said to be: non- painful and harm- less to the teeth. vidual cake tin and can be used on top of the stove instead of in the regular big oven which takes a lot of gas to run. It has a funnel shaped opening in the base of the bake which gives even distribution of heat. Being sealed it preserves the moisture of the object which is baking and therefore does a better bake job. For cooling bottled beverages a convenient unit is now available which stores the beer in a hexagonal tub over which is a rotary ice chopper which shaves ice cubes into chopped ice. toughest flank steak taste like tenderloin, 56 The steak waffler shown at the right will make the The rotary knives break the fibers up into units that cook easily. Modern Mechanix and HOUSEKEEPING Ideas Waffled steaks, oxygen beauty baths and serve-all scissors are among the latest gadgets introduced to the home. These all-purpose kitchen scissors have been recent- ly introduced to serve many pur- poses in the kitch- en. Vegetable slicer, bottle open- er and cap puller ate ‘included in its many uses. Above: Ann Lee, motion picture player, visiting the American Beauty and Styles Exhibition in the Grand Central Palace, N. Y., tries out the oxy- gen bubble bath. This new aid to beauty mixes 20 per cent oxygen with air. The treatment results in bleaching. beautifying. Above is shown a silent portable humidifier, for use in rooms difficult to keep comfortable. Right, above, shows new portable home manicure set which much is claimed for, including its ability to do the difficult task of polishing toenails. Inventions for February 57

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FLOATING AIRPORT The seadrome will be anchored to a huge buoy, secured by a 1,500 ton anchor. In- set shows Mr. Arm- strong, the inventor, with a working model. 60 Here is what the full sized Armstrong seadrome will look like when completed. At first but one-fourth of it will be built, the more economically to test the flotation prin- ciples of the submerged ballast tanks. Later the complete. six-acre field may be built, with hotels at the side as shown or else on a lower deck, according to what tests prove. by BEN LINCOLN runes recently appropriated by the gov- ernment have put the United States De- partment of Commerce, Aviation Branch, squarely behind the immediate develop- ment of a chain of five floating airports which will span the Atlantic for regular airways service. This recently announced appropriation, amounting to $1,500,000 was negotiated by: Eugene L. Vidal, Director of Aeronautics.of. the Department of Commerce, in behalf*of. Edward R. Armstrong, inventor of the séa~ drome, and completes a 16 year fight to gain recognition for a project which both, Mr. Vidal, a competent and experienced air- ways operator, and Mr. Armstrong solidly believe in. As well, it will provide work for a great number of unemployed, as 80 per cent of the cost of such development ` projects goes to labor. Be Modern Mechanix and. to LINK CONTINENTS S This $1,500,000 is for immediate experi- ments with aquarter-section ocean landing- field and ends a sixteen-year struggle for recognition of the seadrome system. The final plan calls for a $30,000,000 outlay by the government, contingent on the success of the preliminary experiments now under way. According to information gathered by this member of the staff of MoperN MECH- ANIX AND INVENTIONS, the ultimate plan calls for similar seadrome stations in the Pacific and other oceans, giving the United States an international supremacy of the air lanes; Great Britain and France both gave the Armstrong plan serious considėr- ation but failed to adopt it. The proposed system calls for five Arm- strong seadromes at 500 mile intervals from the Atlantic seaboard here to the western coast of Europe. Each drome will cost $6,000,000. Back in 1927 when Armstrong completed his first models of the floating deck; he WH il The ever enterprising Germans have already proven the island idea with a ship, thus proving the feasibility. from an aeronautical standpoint. The “Westfalen,” shown above, was stationed midway between Africa and South America, serving the Dornier seaplane as a stopping point in a recent flight. Ships cannot perform the service of a seadrome, however. The ship idea pre- | vents the use of landing with. am- phibians. Flying boats must be hauled aboard and catapulted, as here aboard the German ship “Westfalen.” intended to have hangars and hotels on the six-acre surface. But the design which has been accepted by the government calls for a vacant deck, with hangar and hotel. ac- commodations confined to two or three. decks below the surface. The seadromes will be 1,225 feet long and- 300 feet wide. An elevator will take planes (Continued on page 138) Eventually, if tests prove successful, the government seadrome chain „would dot the Atlantic as shown for 30-hour service between Europe and America. These five seadromes would be situated in fair weather latitudes 500 miles: apart. Inventions for February 61

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Expert GIPS on WINTER GISHING Through the JCE Through the northern ice of Canada Robert Page Lincoln’s huskies drag a canoe loaded with provisions. The author has covered the hunting grounds of the continent, CUTTING HOLE THI THREADED The correct way to cut a hole through the ice and a sure way to attract fish _to the hook is shown in these drawings. Sharp ice edges will cut your fish line. TIED HERE ORDINARY CROTCH PULLS OUT AND UNWINDS A fish line crotch made from a tree branch will permit a fish to wear itself out as it runs away with the line. Another method, a simple winding stick, is shown at right. 70 LOOP TO GO by Robert Page Lincoln Winter fishing is great sport if you follow these expert hints. You can increase your catch with the home-made equipment described here. ICE CHISEL A good ice chisel can be made by welding pipe to an old wood chisel as shown at left. The chisel in use is shown above. The ” 2ywooo Ñ loop prevents the tool from slip- CHISEL ——3>\ EY ping into the water accidentally. UTTING through the ice and dropping a baited hook down to the finny inhabi- tants of the lakes forms a wintry pastime that is indulged in through the whole Jength and breadth of the snow country. That it can be made a very successful pastime, goes without saying. But to have the best results one must know thoroughly the equipment used and how to use it. Making Ice Chisel and Fishing Stick An ice chisel is a real necessity. Some use a common, everyday axe for the pur- pose, but it is unsafe and far from practical. You can make a good ice chisel by welding an old worn-out two or two and one half inch wood chisel to the end of a pipe one and one half inches in diameter. The total length of this pipe handle is four and one half feet. To aid in transporting this chisel, it can come in two pieces, jointed in the middle with a threaded end and coupling. To give the proper heft to the pipe section connect- ed to the chisel, pour that end full of lead. Thus every blow driven into the ice will have weight behind it. To the top of the ice chisel, turn on a T-connection, which will give you a grip, and make it easier to drive into the ice Modern Mechanix and FISHING STICK METAL PROTECTING SLEEVE CHAIR CHAIR: ROUNDS LEG ÉL f Two excellent fishing sticks, easy to make, are shown above. Line fisherman is hold- i | the projecting pieces of wood. Spike is jabbed ing the pistol grip into the ice for leverage against pull of fish after it is “hooked.” type. Photo at the is wound around without hurting the hand. Through the hole of the T-connection, insert a loop of clothes-line, for a turn around the hand or wrist, which will prevent loss of the chisel should it slip from the hand. The fishing stick is a most desirable item in the ice fisherman’s equipment. A very excellent type can be made with a handle that is shaped like a pistol grip. The stick has a notched wooden piece on its side on which to wind the line. Correct Line and Minnow to Use A very simple fishing stick, devised by the writer, can be made from the leg of an old chair, leaving two of the rounds intact, cut off about two inches. On these round- ends the surplus line is wound. The turned part of the upper end of this fishing stick makes a good handle. Fishing sticks may be made from cedar, which provides a light item. To make the “spike” end of the fishing stick, to be poked in the ice‘or snow at the edge of the fishing hole, drill a hole part way into the end of the stick, drive in a ten penny nail or a spike and then cut off the nail and file sharp. A worn out icepick point makes sn unex- celled spike for a fishing stick. A new one costs only five cents. Inventions for February Above at right is the chair leg fish- ing stick in use and at left the right is a closeup of the ice fisher- man’s tools, a home-made ice chisel and the chair leg fish stick. How to make and use these simple, but efficient, fish- ing tools is de- scribed in accom- panying article. For crappie, sunfish, perch and similar .small fish use a nine pound test, black, tournament line, even lighter than that if desired. For pike and pickerel fishing and heavier fish use eighteen pound test hard- braided line. Use the quill-type of sensitive float, for a cork is often deceiving and is not overly reliable. Minnows ranging one and one half to two inches in length are best for crappies, sunfish, perch, and other small fish. Min- nows ranging three to eight and ten inches are best for wall-eyed pike, great northern pike, pickerel. Hook the minnow for all manner of ice fishing through the skin and some of the flesh just back of the dorsal (back) fin, but never so deep that the spine is touched as that will kill the minnow. Never hook the minnow as is commonly done in the stom- 71

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GUNS fromcA NATIONS Stock eMOVIE Arsenals are cleared of all hands, One type of prop the movies never need to fake is a gun. This is but a part of the arsenal at the Paramount Studios, where weapons of every conceivable vintage and type are kept under double lock and key to prevent mortal accidents either in use or while in storage. Here revolvers of all kinds from a six gun to a pearl handled pistol are stored. 76 Extreme precautions are taken by movie studios in handling the very real weapons used in filming modern thrillers. Left shows an expert marksman doing bis stuff when the script called for a shattered door. Such times, sets Above—A war scene from “Bitter Tea of General Yen.” HE machine guns of the beleaguered gar- rison, making a last stand, are rattling and spitting fire at an enemy whose rifles and revolvers crack viciously in reply. Casualties are strewn everywhere and the acrid smoke of battle hovers over the scene. It is a critical situation, indeed—or ap- pears so. Then the director shouts “cut,” and the “dead” and “wounded” arise and brush themselves off. For it is only a scene from a current talkie, and no one is really “wounded in action.” Prevention of Accidents Yet accidents might easily occur in mak- ing just such movie scenes as this, where firearms are used promiscuously. Unless extraordinary precautions are taken, a real bullet, for instance, might find its way into the thousands of blanks that are fired. And even the blanks themselves might cause severe powder burns and disfigurements within ten feet of firing. For this reason the motion picture studios employ every safe- guard possible in the handling of guns and ammunition. Indeed, as James Stembridge, firearms expert and ‘custodian of the Paramount Studio arsenal, puts it, “Our precautions in- clude everything but hanging ared light on the guns.’ “No company on the lot,” says Stem- bridge, “can get firearms, particularly ma- chine guns or ammunition, to use on sets Modern Mechanix and Roland Young and Dewey Robinson, well known Paramount featured players, inspect a corner of the Paramount arsenal, where machine guns and special army-type rifles are stocked. without having a permit signed by the head property man. And no outside studio can rent guns from Paramount without a special permit from the State of California. “We keep a record of each gun that gocs out of this arsenal—serial number, type, etc.—and we know every minute of the time it is in use just where we can put our hands on it. “Our machine guns are kept in vaults and our ammunition in magazines under double Jock and key. It is not only impossible for them to be stolen, but no careless person can tamper with them at any time.” When the arsenal gets a properly signed order for guns and ammunition, the wea- pons are carefully examined by the firearms expert and then locked in boxes to which the head property man has the keys. These boxes are delivered to the set where the company is working. The blank ammuni- tion is also delivered in separate lockers, thus blocking any chance of the guns being loaded by an unauthorized person. Rehearsals are then gone through, and the scene made ready for actual filming. The head property man in the meantime has loaded the weapons which will figure in the sequence. There is a final pause, when the action side of the set is cleared for forty feet. Now the director signals “camera” and (Continued on page 128) Inventions for February James Stembridge, custodian and fire-arms expert for Paramount, also knows his knives. In his care he has a collection of bayonets for all types of guns used by all nations. When a special model of gun is called for, such as a flint- lock, movie realism demands that powder smoke issue not only from the muzzle, but the breech lock as well. 77

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tw a PLYWOOD TOP OF PIPE SHAFT SPLIT TO RECEIVE TONGS OF SPECIAL

D |o | F

ROTOR IS TRUED UP AND MADE RIGID BY ADJUSTING EYE~ BOLTS

The rotors ave no more difficult to build than big box kites, ahd are fabricated from veneer, old pipe fittings, wite stays and doped muslin to give the barrel effect. 100 ROTCRS REVOLVING } CLOCKWISE

| Reena AN Shiyi — oe $ An efficient iceboat that will show good speed with little exposed driving area can be built from these plans by Dick Cole.

VACUUM POCKET IS CREATED * IN FRONT OF REVOLVING ROTOR CYLINDERS | 4A L7 A Fa `M yes BFA RA A 4 t O pha DIRECTION Å OF WIND

H! A 4 The diagram above explains the rotor driving principle. One can sail into the wind on a fairly sharp tack, but must employ a reversing gear to spin the rotors in opposite rotation in order to tack back the same way. ERE is something which will tickle the fancy of the ultra-modern experimen- ter who delights to delve into unplumbed depths—a rotor iceboat. Readers of this magazine will have read of the rotor ship built in Germany several years ago. While the principle of operation of this ship was scientifically sound—as proved by practi- cal experiments—commercially, it was a complete flop. No “wind-jammer” of any kind can possibly oust the steamship and the modern motor-ship from the salty waves. Might as well expect domestic zebras to restore the popularity of equine-drawn vehicles. Nevertheless the German rotor ship did function mechanically as intend- ed, albeit was dependent for its actual propelling power upon the wind, just as much so as an old “Yankee clipper.” But it did move through the water by “rotor power” application, was maneuverable, and it cruised. If “rotor power” can move a cumbersome hulk through the water, how much more readily can it propel a practically frictionless iceboat over the shimmering ice! And so we have it in Modern Mechanix and JILDING a NOVEL “Rotor JCEBOAT ~> DICK COLE

our drawings here. A freaky-looking craft —suggests the sky-line of Pitisburgh—but the “derned” thing runs—that is, slides. You ask: “What is this ‘rotor power,’ anyway?” The drawing illustrates the prin- ciple, and shows its application to the iceboat. Here’s the dope: when a current of air—wind—strikes against a revolving cylindrical surface, the air is diverted in the direction of revolution. However, it does not cling to thé surface, but is thrown off at a tangent, creating a vacuous pocket in front of the cylinder. Obviously the cylinder tends to move into the vacuous space, and pulls with it the body to which it is attached. A simple rule decides the direction of the force. When the cylinder revolves clock-wise, let the index finger of the right hand indicate direction of wind. Now spread out the thumb at right angle to index finger. It shows the direction of force. With a counter-clockwise revolving cylinder use the left hand.

re—— l2” —~~,_ SECTION ———_ THROUGH “ee LO SHAFT (Spree)

METHOD OF SECURING BICYCLE FRAME TO 2X4" EXTENSION

STAY-ROD SUPPORTS BICYCLE

ANGLE IRON BRACING

|| << ZX 6" FACED WITH ANGLE IRON

BRACE" 1" Lp i Ky [< 12ʻ0 7 i t taro" i ROTOR RUNNERS DISH OUTWARD SCREW EVE STEERING CABLE

BICYCLE FRAME

FORGED FROM OLD SPRING LEAF

REVERSE LEVER (SEE Beta) (GK Lipp LIRON PIPE 2 WITH ENDS FLATTENED

BRAKE LEVER HOW STAY-ROD IS SECURED TO FRAME

ROTOR (SEE DETAIL)

The disposition of the rotors, the size of the iceboat, and the driving details are shown in the drawings above. There is another detail drawing which shows the reverse mechanism used on opposite tacks. Note construction of the brake. Inventions for February 101

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Reverse and Pedaling Machinery WIRE STEERING CABLE DETAIL OF REAR RUNNER F COACH BOLTS ~ RUNNER IS SLIGHTLY ROCKER SHAPED. SPECIAL WASHERS I e SLOT IN BOTTOM FITS OVER STEEL RUNNER BLOCKS BOLTED TO SIDE OF RUNNER REVERSING LEVER PLATES CLAMPING f HORIZONTAL FOR The top drawing shows the construction of the steering runner. Rudder post is riveted directly to runner blade. Details below show construction of reversing mechanism, SET SCREW From the foregoing one will have learned what “rotor power” is all about. Now we will apply it to the iceboat. Let it be said right now that the amateur builder need not “shy” at the construction; it is not at all complicated nor is it costly. A bicycle is temporarily requisitioned to provide the motive power; the shafting, for the most part, is.1%4” pipe (second-hand, at that); the bevel gears can be bought at any auto wrecking yard for “six bits”; the rotors are a skeleton frame-work covered with mus- lin, and “doped”. A few miscellaneous pipe fittings complete the list of material. From the plan and elevations the builder can readily construct the frame, and can mount the bicycle—sans wheels—on the projecting right front end of the frame. It will be seen that the drive shaft, with its supporting cross members, is built up as a separate assembly, and afterward slipped up between the 2 by 4’s of the main frame and secured with %” lag-screws. All the bevel gears on the drive-shaft are “spider” gears from old differentials. The gears are bored out so that they are a light driving fit on the %” pipe which serves as the shaft. Their mating gears are on the vertical shafts of the rotors. Before permanently pinning any of the gears to the shaft, it is well to try them out and determine their actual pitch line first. The brake is incorporated into the main frame assembly, and should be built into the frame at this time. Its construction and operation is so simple that it needs no elaboration: The drawing shows the simple clip which serves as the fulcrum for the brake lever. i SLEEVE a SLIDES ON i ELBOW E AND COLD ROLLED ROD WITH ROUND END which is extremely simple and easy to build and should deter no one from building this big dollar’s worth of fun. 102 Modern Mechanix and We will now take up the construction of the runners for the iceboat. One drawing shows the front runners. The runner body proper is cut from a piece of selected maple or oak 1’x6"x36”". A 2” groove 3/16” wide is cut on the lower edge of the runner. This can be readily done on a circular saw. Again one visits the auto junkman and obtains three old spring leaves 3/16”x2%” and over 40” long. Any blacksmith can quickly forge these as shown in the insert drawing. Also drill the holes and then re- temper. Note particularly that the runners are dished outward 1”. This adds strength to the construction and brings a keen edge in contact with the ice to prevent side slipping. The runners are secured to the cross-member of the frame with 5/16” lag- screws, and still further re-inforced with a %” angle-plate underneath. Rudder Runner Now we come to the rear runner, which, of course, serves as rudder. For the most part, the construction parallels that of the front runners. However, the body is cut from 1%” stock and the steel runner is slightly “rockered” to facilitate steering. Note the sectional conical blocks bolted to the sides of the runner. These are to give a greater surface for the swivel washers. The rear elevation shows clearly how a 3⁄4” floor flange and 4” nipple serve as a housing for the %” rudder shaft. Note de- tail of rudder shaft. Note how the notch in the bottom rivets over the steel runner assuring rigidity. An essential point in the rear runner construction is that the point of contact with the ice is back of the center- line of the rudder shaft. Now for the rotors themselves! The drawings present the construction so clear- ly that little need be said in addition. Particular attention is called to the ball (or roller) bearings at the top of the drive-shaft housing. The housing itself is a 24” length of 2” pipe held in a floor flange. A 2” union at the top is machined out to receive a front wheel bearing from a junked car (page the junkman again). Note the special flanges, which secure the rotor disk to the drive shaft. These can be cut out with saw, chisel, and file. The holes are cut out of the plyboard disk solely to lighten rotor. Rotor Covering Also depicted are reinforcement angle brackets and the eye-bolts with which the stay-wires are adjusted. The frame is ac- curately trued up before the muslin cover- ing is put on. Unbleached muslin is the covering. After being stretched on it is sprayed with water. Upon drying out it will shrink “as tight as a drum.” It is then sprayed with airplane dope or lacquer. A finishing coat of aluminum paint enhances the appearance. Now we come to a very essential factor in the construction: means of reversing the direction of revolution of the rotors. This is as essential as swinging the boom of a Inventions for February Details of Runner Bracing ANGLE IRON REINFORCEMENT CROSS MEMBERIS zx Ex 12'O"SELECTED DETAIL OF FRONT RUNNER EDGE HOLLOW GROUND The method of bracing the’ front and side runners, as well as construction of the blade itself is shown here. sail to catch the wind at the proper angle. In fact it serves a similar purpose. The details of the reversing gear are fully shown. It will be seen to be the acme of simplicity. First note how the original chain and rear sprocket of the bicycle are re-located to drive the cross-shaft. If the original bike sprocket is used it will prob- ably have to be welded or brazed to the end of cross-shaft. However, any of the “stock gear” manufacturers make sprock- ets with a hub which can be pinned or keyed to the shaft. Note how old front wheel bearings (page Ikey again) support the cross-shaft. Not only do these provide frictionless bearings, but they take up the thrust of the bevel gears as well. It will be seen that the driving gears of the reverse gear are brazed to a sleeve which is free to slide upon the drive shaft. A hardened %” pin screwed in the shaft engages a U slot in the sleeve. To reverse the gears, the pilot momentarily back-ped- als on the bicycle. This throws the pin out of the slot parallel with the circumference of the sleeve. With the reverse Jevel, within convenient reach of the pilot, the gear sleeve is moved so that the pin engages in opposite slot. Simple? What! There’s your rotor iceboat. Now go it. All you need is a fairly smooth ice surface and a 15, or more, mile an hour wind. Obviously one needs a cross wind, but, nevertheless, the rotor iceboat can be brought “close into the wind” the same as any wind-jammer. The pilot will quickly learn the peculiarities of rotor sailing from experience. It requires very little muscular effort to maintain the rotation of the rotors. They should revolve 200, or more, revs. per minute. 103

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uild This Scale "URN TO GREATEST ~ DIAMETER OF HULL PRELIMINARY STEPS IN SHAPING HULL TURN TO CORREC DIAMETER AT EACH STATION — AFTER MARKING ON CYLINDRICAL BLOCK.......- 0.388" te | 0.291" whe 0.292” > A B e RECESS ? [WITH KNIFE | ETAIL OF NTROL CAR aa | 1 D co I L 770" a Direct from the Goodyear Zeppelin Cor- poration come these accurate scale model plans for the world’s largest dirigible air- ship, the Navy’s U. S. S. Macon. by J. EARLE MILLER A view of the completed model, as it is supported on the mantel by its por- table mooring mast, by the bumper under the lower vertical fin, and by a length of bus wire. ERE they are—scaled plans for a dandy model of the pride of our Navy, the U.S.S. Macon. Eighteen inches long she’ll be, with mooring mast, control cab ’n every- thing, and she’ll look swell in her glistening coat of aluminum, sitting up there on the mantel. The hull of the Macon is turned from a block of hard wood, first to its largest diameter of 3.188”, and then down to the correct diameter at each station, as shown on the drawings. All dimensions are given in decimal fractions of an inch, to facilitate the scale reduction. A 6” steel scale gradu- ated in hundredths of an inch should be used in laying out the hull. All fins are carved from wood to the Control cab is carved from a block of wood 12" x 1⁄4" x1 4". Section B-B shows how the bumper is formed below the cab. Windows are recessed by using knife and small chisel. 0.356”. Fie tole 0.321” ; D CURVE} i | | l TOF HULLE i FY SEE DETAIL uF FINS SEE DETAIL OF INSIGNIA AT STATIO SEE DETAIL OF #—— LOWER FIN DIAM. OF HULL | cee DETAIL N | OF LETTERING ALL DIMENSIONS IN HUNOREOTHS AND THOUSANOTHS OF AN STATIONS SEE OETAILOF RADIATORS SHIP SEE DETAIL OF of SEE DETAIL OF CONTROL CAR ; OUTRIGGERS 2-60" Modern Mechanix and odel of the “Dirigible U. S.S. eacon so ORDINARY PIN CUT HERE lhe Details of the eight propeller outriggers. Solder is used to obtain streamlined effects for the struts. The full size Pattern of the navy insignia and lettering gives the color scheme to be followed. Radiators are outlined in the hull by cutting notches with a knife. Lower vertical fin is cut as indicated by heavy line in full size pattern at right; other three fins according to dotted lines. Mooring mast is of radio bus wire. size of the full size pattern shown. The bottom vertical fin is different from the other three, in that it has a control car in its leading edge, and a bumper beneath to rotect it when the ship is on the ground. Vindows’ in its leading edge are cut into the fin with a knife and small chisel, and painted with white paint to which a small amount of blue has been added to give the bluish tint of glass. Hollow out slightly the edges to be glued to the hull, then glue them in place, using small brads if neces- sary. The control car is carved from wood to the dimensions shown, windows are cut in and painted, and it is glued in place. Since the Macon’s eight Maybach engines are mounied inside the hull, only the out- riggers on the eight propellers need be made. Drive shafts from each engine lead to swiveling balls containing bevel gears to which the propellers are attached. _ The streamlined drive shaft housing can be formed from light brass or copper sheet cut to the contour shown in the sketch. Solder is made to flow over both sides of the flat housing strip until the desired streamlined shape is obtained. A file can be used to trim the solder where necessary. The housing is made 14” longer than shown, the extra length being driven into a slot in the hull. The braces which support each drive shaft are cut from sections of small com- mon pins, driving the pointed end into the hull and soldering the other end to the shaft housing. (Continued on page 118) Inventions for February DROP BEAD OF SOLDER ON PIN HEAD AND TRIM TO BALL WITH FILE FULL SIZE PATTERN OF |SOLDER INSIGNIA & PAPES WHITE cv LETTERING | A B a EXACT >f 7 L \ SPACING EN Fut SIZE 7 PATTERN Y OF THE FINS REMAINING 3 FINS THUS SECTION B-B de BALL OF SOLDER 8 ROD HOLLOWED OUT, T 4 PLAN VIEW OF BASE Sie = meee Tine LVALY oe DETAILS ÒF THE TRIANGULAR MOORING - MAST 105

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“Daylight “Developing ‘oank by L. C. PELTIER Now that panchromatic plates and film have generally come into use, most developing is done by the time and temperature method which involves a long and tedious vigil in a darkroom unless a simple developing tank like this one is used. Made from a varnish can, this developing tank will perform all functions in HE entire equipment necessary for de- veloping, fixing and washing photo- graphic negatives can be constructed from half of a one-gallon varnish can, together with a few other odds and ends of scrap material. * Since panchromatic plates and films have come into common use, developing is gen- erally done by the “time and temperature” method. This is usually done in total dark- ness, using three or more trays or tanks containing separate solutions of developer, water and hypo. Obviously there are many disadvantages to this method but with the one-tank system to be described these may all be eliminated. Tank Will Hold Twelve Films A long tedious vigil in a stuffy dark room is no longer required. Instead, the plates or films are transferred from the plate-hold- ers to the tank in a dark-room or changing bag, the cover placed on the tank, and the remaining operations may all be done in broad daylight. The tank shown was designed to accom- modate twelve cut films of size 3% by 4%. For use with plates or films of other sizes some of the dimensions will, of course, have to be varied accordingly. The average one-gallon varnish or paint can has a base measuring about 4 by 6 inch- es. The can should be sawed in two at a height of 5% in. which allows a 3/16” edge to be turned over on the inside. Most cans of this type have a raised bottom, 3/16” in this case, and solder should be run into the slight channel which this makes on the inside to provide a fairly smooth floor for the tank. The inlet and outlet connections may be made from any light gauge tubing; in this instance they were sawed from an old pair 108 broad daylight if accompanying instructions are followed. of bicyele handlebars. Whatever. is used should have an inside diameter large enough to permit the tank to be quickly filled and emptied. With a sharpened screwdriver and round file, holes are made in one corner of the tank and the connec- tions inserted and soldered flush with the inner surface. An ordinary cork can be used to close the drain outlet but as the inlet pipe must be filled nearly to the top a screw-on cap should be used here and it will be found. that the cap and neck cut from an old furniture polish can or similar receptacle can be easily soldered onto the inlet pipe, making a neat and well-fitting cap. Solutions Circulate Freely Some means must be provided which will permit the free circulation of the solutions and still prevent the passage of light. This is accomplished by a number of overlap- ping leaves or shutters of light gauge metal arranged as shown. The leaves are soldered to the tank and to the partition before the Jatter is put into place. Slant the leaves as shown to insure the complete drainage of the solutions. Cut the opening in the par- tition and solder into place. Some form of protective coating must be applied to the inside of the tank to prevent the chemicals from attacking the bare metal. Special varnishes and enamels such as “probus enamel” and “traycote” are made for this purpose and sold by photo supply houses. They are inexpensive and easy to use as they may either be applied with a brush or flowed on. Ordinary as- phalt may also be used although it is more difficult to apply properly as it must be heated before it will flow. Whichever material is selected it will be necessary to coat the inside of the light- Modern Mechanix and eMade from “UARNISH (an trap chamber before its cover is put on. If the asphalt is used heat it until quite hot and pour into the chamber. A gentle heat can be applied to the outside of the tank until the asphalt flows over and covers all surfaces with a fairly even coat. For any places which are hard to get at, an old table knife can be heated and used as a spreader. As asphalt dries with quite a gloss which might reflect some light through the chamber, it is well at this time tc. deaden this gloss by gently applying a little turpentine to the interior surfaces. After coating the interior of the chamber, spread a thick coat on the inner surface of the chamber cover and solder this in place, then invert the tank and hold the soldering-iron in contact with the cover long enough to flow the asphalt which was placed upon its inner surface. The sheath racks are simply flat pieces of sheet-metal to which are soldered the channels which support the negative sheaths. With a scribe mark out the loca- tions for the channels. These latter are made by forming a 7/16” wide strip over the edge of a piece of 3/16” iron. After soldering these on, cut V-shaped notches in the base and drill a number of small holes between the channels to assist in the circu- SHEET IE RUSBER lation and rapid drainage of the solutions. It will be found that by utilizing the spaces between the channels, an additional dozen negatives can be developed without over- crowding. The most accurate way to make the nega- tive sheaths is to lay an old negative on a piece of sheet metal with the top flush with one edge and with a scribe mark around the other three sides of the negative. Allow (Continued on page 130) This shows the tank with the film frames in their racks, The light trap permits the addi- tion of liquids; will not pass light. L {ht SOLDER‘ to | |i} BOLT SLOT | ONE SHEATH AND CHANNEL SHOWN->| 1⁄2 INSIDE VIEW ONSLUGHT TRAP ~ LEAVES SHEATH RACK CHANNEL #28 GA. TOP VIEW = F Fai k BOTTOM n LIGHT TRAP PARTITION NEGATIVE SHEATH # 28GA. [AT E PARTIAL TOP VIEW OF ake DETAIL OF CHANNEL krim SHEATH RACK 328GA. The base size of the average varnish can is 4” by 6”, which will allow of a tank being madè to accommodate a dozen cut films 31/4 by 414 inches. Inventions for February All of the metal interior is simple sheet metal work, done with ordinary soldering iron. 109

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© SMALL IDEAS MAY HAVE LARGE COMMERCIAL” POSSIBILITIES - Delays are Dangerous in Patent Matters HE FREE BOOK shown here was prepared for in- ventors, to show them exactly what steps they must take to secure a PATENT. If you have an idea, you should send for this book AT ONCE. It will tell you ex- actly how an application for a Patent is made, what information you must furnish your attorney, and what steps he must take in order to protect your interests. Remember, inventing an article is one thing — securing the exclusive right to Gt 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 possi- ble. Send at once for this book. After you get that, you’ll know exactly what to do to protect yourself. I Serve You Quickly and Seeretly Anything you write me or send me is strict- ly confidential between us. All letters and drawings are kept in strong, steel, fire- proof files, which are open only to myself or authorized members of my staff. I 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. I have had years of ex- perience in Patent Matters. When you place your idea in my hands, I am in posi- tion to proceed at once to secure protection for you. My fees are reasonable, and, if you desire, I can arrange convenient terms of payment. IMPORTANT! Please understand that you are not under the slightest obligation in sending 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 pro- ceed or not as you choose, to make your ap- plication for a patent. e@oeeesd CLARENCE A. O°BRIEN Registered Patent Attorney 317-C Adams Bldg., Washington, D. C. (Practice Confined Exclusively to Patents, Trademarks, Copyrights) 144 Thank You for Mentioning Modern Mechanix and Inventions for February When Writing to Advertisers a> T will send you my Record of Invention form FREE. This blank will enable you to make a sketch of your idea in proper form and have it wit- nessed in such manner that it may be of value to you as evidence should the occasion for evidence arise. In my book, I tell you how to use this form to pro- tect your interests. My Loeation in Washington MY offices in Wash- ington are convenient to the Patent Office, and I and my assistants can, therefore, appear prompt- ly before the officials and Examiners. Reasonable Fees and Convenient Terms I have served thousands of inventors in all parts of the United States and I am able to serve you very rea- sonably and extend liberal terms of payment. So don’t waste valuable time. od and this —_ vey: Free Book | Telis How | How your Patent Application is made; what kind of sketches or drawings are necessary; what other f papers must be made out; how the Patent Laws protect you; why it is important to avoid loss of time in O getting: your application filed; and many other important points. Even 6, OO a very simple idea, if new end useful, may prove very valuable, You may have much to gain and nothing to lose by sending for this book TODAY. CLARENCE A.OBRIEN GISTERED PATENT ATTORNEY 317-C Adams Building WASHINGTON, D.C. Please send at once your FREE book, “How to Obtain a Patent” and your “Record of Invention” form. Thank You for Mentioning Modern Mechanix and I nventions for February When Writing to Advertisers 145

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