Modern Mechanix, January 1935

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NOW 5 OMODERN MECHANIX and } L iS) <q a. lal ll 4)

How Workshos Hobbies Win Sdccdss ` By the President of Packard Motors

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Thrill to Guaranteed World-Wide MGA FIDELITY Performance with This (ALL FIVE WAVE BANDS ) a ats ee lol UBE kadio! ONLY BADIO COVERING 9 TO 2,400 METERS. ) 12,000 MILE TUNING RANGE WORLD'S GREATEST RADIO VALUE . / Deluxe Auditorium -Type SPEAKER (L455 TUBES ) EFORE you buy any radio write for the new FREE 1935 Midwest “Fifteenth Anniversary” catalog and see for yourself the many reasons why 110,000 satisfied customers bought their radios direct from the Midwest Laboratories and saved from 14 to 14. Why pay more than the direct-to-you laboratory price? wora titema to A Sa ; i -SR 3 orld - Wide Reception You, too, can make a positive saving of from 30% to 509% by buying Middte- = this more economical way. Learn why Midwest outperforms sets cost- {ROT Here are ing up to $200.00 and more. Never before so much radio for so little somo of g money! Midwest gives you triple protection with: One-Year Guar- tions T Only Midwest Gives You Multi-Function Dial antee, Foreign Reception Guarantee, Money-Back Guarantee. bA ¥,° EAQ.Ma- This dial was designed in keeping with 7 m Z San the trend of the times, yet is not ¿n airplane 50 ADVANCED 1935 FEATURES equalled world-wide broadeasts.. Spit: dial! It is a many-purpose dial that per- Many exclusive features include: England, France, Germany, Spain, Ban Goan forms many functions. Now, Midwest guar- Micro-Tenuator... Fidel-A-Stat. Italy Rusin, Australia, ae Send fa rae Sear Ti 7 H avy Pa! G tralia—VK2ME, Syd antees that inexperienced persons can se- Separate Audio Generator...Cera- ‘today for money-saving facts! Sustraia VKAME, Byd- cure good foreign reception. Send for FREE mic Coil Forms, ete. Only Mid- SENSATIONAL HIGH FIDELITY RECEPTION HJISBE, HJsABF, Co: miniature of actual rotating dial which West covers a tuning range of 9 to This bigger, better, more powerful, clearer- more., Gotima "Hatheld, clearly shows these outstanding advantages: 2400 meters (33 Megacycles to 125 toned, super selective, 16-tube radio gives 2202 Grand Avenue, 1. Dial calibrated in Kilocycles, Megacycies KC)—enabling you to easily and you absolute realism-assures you Callatis i successfully tune in even low- Yoyhaseereresperienced before T b pS alata a eae ed Ve powered foreign stations up to hear one more octave—overtones : h Peruvian Pralses ing Forelgn Reception will Lima, that Peru— 3. Slow-Fast, Smooth-Acting Tuning; 12,000 miles away with crystal- cannot be brought in with ordinary ra- We bave 4. Station Group Locator; clear, loud-speaker reception. cael He A a A Gua con i ifi i i H 7 1 wel e Pe | tinents o Rurtmatic SeleetorBana iiaiciten, All 8 Wave Bands enable vou to eanan giver 7. Illuminated Pointer Indicator; enjoy today’s finest High Fidelity 26 Have re- 8. Silent Shadow Tuning—Improvement on -American programs. In addition, ceived Take advantage of Madagas- Meter Tuning; you get Canadian, police, amateur, car, Sydney, London, Paris, $ + A S 2 | the amazing 30- \} h 9. Centralized Tuning. Commercial, airplane and ship \ ay FREE trial ‘tout, Meow, Madrid, New Style Consoles broadeasts and derive new delight offer. Send for ^d also South American transmitters. Marquis He | FREE catalog. Buchanan, Apartado 96, A Š Plaza San Martio, 171. MAIL COUPON. TODAY’ FFT AMAZING 30°DAY FREE TRIAL OFFER AND NEW 1935 CATALOG MIDWEST RADIO CORP., Utor-Agents Dept. 811 Make Easy Cincinnatl, Ohto. Extra Money Without obligation on my part aend me your new FREE 1935 catalog, | Chock Here FREE Ministure Dial, and com. | for plete details of your liberal 30-day | Detaita FREE triul offer. This is NOT un order. The Midwest 36- and rew excitement from un- page catalog pic- PEAL DIREC WITH LABORATORIES line of beautiful, ar- Increasing costs Ara sure to result in RLY: \ a e, 3s uy before the big ad- tistic de luxe con- vance... NOW...while you can take advan-, sole and chassis in tege of Midwest. sensational values...no four colors. Write middlemen’s profits to pay. You can order UPTO your 1935 High Fidelity radio from the new for new FREE Midwest catalog with as much certainty of o, catalog today! satisfaction xs if you were to select it in our © great radio laboratories. You save 30% to Midwest long-range acs when you buy this popular way...you get 30 days radios nas 50 & FREE tratas little as $5.00 down puts a Mid- priced as 0 S west radio in your home, Satisfaction guaranteed . lowas.. — [ZZ] or money back. Write for new FREE catalog today. W A 5 MIDWEST RADIO CORP. _ DEPT. 811 aANT] alo U. S. A. Established: 1920 % Cable Address Miraco. 3... All: Codes ewn menneneecsneee

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LET THESE ENGINEERS RIGHT FROM THE HEART OF THE BIG RADIO INDUSTRY Fruin- You at Home for coop pay RADIO work MANY R-T-I TRAINED MEN MAKE ‘35 To 75 AWEEK If you’re dissatisfied with small pay—work that’s getting you nowhere—lay-offs and un- certain income—here’s an opportunity that’s too good to miss. At the cost of only the time it takes you to mail the coupon, you can get my big FREE book, “RADIO'S FUTURE AND YOURS.” This book tells how you can learn at home to make more money almost at once in Radio—whether you want to make Radio your life’s work, or use it to pick up an extra $5 to $20 a week in your spare time. “RADIO IS GROWING BY LEAPS AND BOUNDS” says Radio Craft Magazine. It has forged ahead even in depression years. Where only a few hundred men were employed a short time ago, thousands are employed today. Where a few years ago a hundred jobs paid $35 to $75 a week—there are thousands of such jobs today. And more new jobs being created all the time—full time jobs and spare timejobs. Get my book and see how easy it is to learn at home for this good-pay work. R-T-I TRAINING IS“SHOP TRAINING” ’ FOR THE HOME It comes to you right from the Radio Indus- try—right out of the factories where Radio sets and other vacuum-tube devices are made. It was planned and prepared for you by big radio engineers IN these factories, most of whom are the Chief Engineers of these great Radio plants. And NOW these same engineers are actually supervising R-T-I Training. Which means that trained the R-T-I way, you'll be trained as the Radio Industry wants you trained—just as the Radio Industry, itself, would train you if it was doing the Job. 4 BIG WORKING OUTFITS INCLUDED These are probably the biggest and most ex- pensive Working Outfits ever included with a ome-training Course. You use them to build up testing equipment—to experiment with—to do actual Radio work. It’s Shop Training for the home. SOUND PICTURES, P. A. SYSTEMS, PHOTO CELLS, TELEVISION, ETC. ALL INCLUDED i Radio service work is just the starting point in R-T-I Training. From there we take you up through the very latest developments in Radio, and then on into the new and larger field of Electronics—Sound Pictures, Public Address Systems, Photo Cells, and Televi- sion. This feature alone makes R-T-I the outstanding home training in Radio. YOU-GET “QUICK RESULTS” C. E. Head, 431 Third St., Alexandria, La., says: ‘Made my first money 11 days Het starting your training—cleared Frank E. Klemann, Lisle, Ill., writes: “Doubled my pay in less than six months,” Harry L. Stark, Ft. Wayne, Ind., writes; “Now making three times as much money as I was when I started your training,” AGE OR LACK OF EDUCATION NO HANDICAP You don’t have to be a high school graduate. It isn’t necessary that you should have fin- ished the grades. My Training in Radio is so simple, so easy, and so practical, that it offers every man, regardless of age, educa- tion, or previous experience, the chance to get out of a small-pay, no-future job, into good pay, big future work in Radio. YOUR MONEY BACK IF YOU ARE NOT SATISFIED That’s my way of doing business. And PI give you that agreement in writing—an agreement to refund every penny of your tuition if, on completion of my Training, you are not entirely satisfied. NVESTIGATE! Learn why R-T-I Training is different. Find out why R-T-I Trained men get “Quick Results” and “Big Results.” Send today for my big book “Radio’s Future and Yours.” The book is free. RAY D. SMITH, President Radio & Television Institute, Chicago ee T ‘say these 5O ‘LEADING RADIO MANUFACTURERS | AMERICAN TELEVISION ARCTURUS TUBES BALKEIT . BRUNSWICK CAPEHART CLOUGH-BRENGLE CO. CROSLEY + CLARION Də FOREST « ECHOPHONE FADA ~«. GREBE . HOWARD HAMMARLUND « HICKOK INTERNATIONAL RESISTANCE CO. KENNEDY « KOLSTER - LYRIC MAJESTIC « PHILCO RADIO PRODUCTS CO. SANGAMO ELECTRIC SENTINEL ~« SHELDON SILVER-MARSHALL MFG. CO. STEWART-WARNER STROMBERG-CARLSON UNIVERSAL MICROPHONE ZENITH MAIL. COUPON FOR MY FREE BOOK f Get your copy of “Ra. gio's Future and Yours" today. It telle you about Radio's amazing opportunites. It dea- eribes my Course. It tells what R-T-I stu- denta are doing and mak- ing. It's FREE. Clip, eizn and mail coupon RIGHT NOW! - - -n CENE Ray D. Smith, President RADIO AND TELEVISION INSTITUTE (R-T-1) 2130 Lawrence Ave., Dept. 31 Chicago, Ili, Without obligation of any kind please send me`a copy of “Radio’a Futuro and Yours.” I am inter- ested in your home training and the opportunities You say exist in the great field of Radio for the R-T-I “Trained man, Thank You for Mentioning Modern Mechanix and Inventions for January When Writing to Advertisers 3

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D ill P New “DELTA” Models || Now Complete Full Line of Modern Drill Presses 4 Two: new “Slo-Speed” Drill Presses together with other models now makes available Delta Drills. for- every. purpose—in home workshop and ‘factory alike. A Delta Drill Press is al- most ‘a complete: workshop in one tool. It can be- used for: mortising, routing, drilling, carv- ing, sanding, shaping and surface grinding. Delta.Drill Presses embody Delta “quality” throughout—and yet are priced at unusual low price lévels. Send for catalog. See coupon below. NEW TOOLS—NEW FEAUTRES IN 1935 “DELTA” LINE! The new “Delta” Drill Presses are but two of the many new improve- ments and tools announced this 4 year by Delta engineers. This year am the Delta line of motor-driven ` © woodworking tools is more com- NEW 6-INCH plete than ever before. Delta stand- JOINTER ards of efficiency, quality and con- Has new Patent- venience have been strictly main- ed: Fence, and tained—and Delta prices many unusual im- sti]] kept at their low provements, levels. Good compact j motor-driven tools are within the reach of all. _. Every woodworker will i tnd the new 1935 Delta line of unusual interest. The “Delta” line includes: Jointers, i Circular Saws, Band Saws, Scroil NEW SCROLL Saws, Drill Presses, Woodturning SAW Lathes, Boring, Routing, Sanding, Cuts with finest and Mortising Attachments—and a jeweler’s bladesat. complete line of accessories. full. motor speed. Hany” ote ie WRITE FOR CATALOG The 1035 catalog of Delta quality motor driven tools io aa Pet tet th $ naa lela | now off the press. It is crowded with photographs an 4 information about the new line of 1935 Delta tools, It DELTA ag ü MANUFASTURING on shows how Deltd tools are built to stand the grind of pro- Dept. M136 BN. orton Steh ha i PN nd duction work, and yet are so low priced. as to be within the I enclose 10c (stamps or coin), for which please se z me one copy of ‘Practical Delta Projects”. Also place me reach of all. on your mailing list to receive 1935 Delta catalog of , Send coupon so your name will be placed on the mailing quality motor-driven woodworking tools, list to receive the 1985 Delta catalog without delay. n- close only 10c at same time for Book of Practical Delta Projects. 32 pages of new and novel things to make, with many blue prints, working drawings, photographs and illus- trations—and complete directions. DELTA MANUFACTURING COMPANY. Dept. M 335 3775 N. Holton Street Milwaukee, Wisconsin t oa are a Delta user now. Bn eee seas 4, Thank You Jor Mentioning Modern Mechanix and Inventions for January When Writing to Advertisers

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PRICE 15 CENTS (20 CENTS IN CANADA) EOE JANUARY Volume XIII 1935 Number 3 baad fy Gts SPECIAL FEATURES | Big $500 Contest! Packard’s President Tells How Workshop Hobbies Win Success - 32 By Alvan Macauley as told to Paul Weber New Toys Fill Santa’s Pack - ~ 37 How Special Built Plane Won Greatest Air Race - - - - a č a - 38 By James Dyson Win Cash for Furniture Ideas in $500 Contest - - - - - - 44 Have you a new idea for restoring old By J. Julius Fanta one oes «teal Gf 00 in cash for home improvement suggestions. Seeking Wealth in Virginia’s New ‘Full Details on Page 44 Gold Rush =o = = «© = =- 48 By James Nevin Miller ‘ SHORTER FEATURES Previewing America’s 1935 Automobiles 52 Giant Tower to Guard Paris 42 By Glenn Jenkins Robot Keeps Cars from Freezing - -= - 54 Analyzing Hockey—Fastest Game on MM’s Cover from Painting to Earth - z P = - 3 . - 56 Magazine- - - =- + 355 Movie Filmed in Above- By John C. Hoffman Ground “Subway” - 2 59 ildi i . London Wreckers Slice Water- Building World’s Largest Earth Fill Dam 60 lbo Beles, a ee we How the Microscope Detects Crime Clues 63 ite: See ee tre 79 By Julian D. Corrington, Ph.D. Roams Ocean Pooti S F HOW-TO-BUILD Seeking Sunken Gold 15 Minutes FEATURES from Broadway . z . 7 - 64 Two Tube All-Wave Radio = By Alfred Albelli Plugs Into Light Socket - 90 Chri H Lighti The Secrets of Radio’s Sound Experts - 68 | Effects. ane. 94 By W. L. Collins By David A. Brown Starting Your Car in Cold Racing Car Tires Need No Air - - - 73 Weather - - - - - 98 By Nic Sprank in Oddities of Science Print Photographs in Color on Metal Gifts - - =- =- 102 Riding the Skyways with Modern By Kenneth Murray Barnstormers - - - - = - 74 How to Improve Your Roof - 106 By Dale R. Van Horn By Weston Farmer An 00-Gauge Coach for Model Jli Railways - - - =- - 110 For Thrilling Sport Start a Skeet Club 30 By H. T. Nieter By Capt. W. H. Fawcett (Contents continued on page 6)

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TABLE OF CONTENTS (Continued From Page 5) NEW MECHANICAL INVENTIONS INTERESTING SCIENTIFIC ITEMS Handle Opens One-Piece Razor - - - - 35 | Kingsford-Smith Makes Record Hop - - 35 Telescope Trailer Shrinks or Grows - - - 36 Chicken Guests Fill Miami Hotel - = = 353 Outboard Powers New Motorsled - . « 36 | Train Sets Record Across U. S. - + - - 36 Spring Makes Key Self-Ejectin ee 36 Plans Sub Route England to Japan - - - 41 PTE erase. ey vee 8 Snow Samples Show Water Content - - - 4l Constructs Virtually Foolproof Auto- - - 43 | pilot Sets Record of 440 M.P.H. - oo. 41 Portable Router Aids Shop Work - - - 43 | Tree Wiecks Piccard Strato-Balloon - - - 46 Grid Star Invents Downs Marker - - - 43°| Artist Makes Pasteboard Masks - - - - 47 f Dieral “Ge T s Radium Produced from Table Salt - - - 50 Dearbh Ray Pitol Seira Animals n Builds 38-Foot Model of Moon - - - - 58 Bike Pedal Light Warns Motorists - - - 4 Sun’s Rays Drive Small Motor - - - - 62 Rotary Golf Game Affords Practice - - - 47 | German Ship Is Spliced Together - - - 62 Cabin Life Preserver Tested? - - - - 47 School Trains Future Explorers - - - - 66 Wind-Propeller Sails for Liners - - - - 50 Mayan Throwing Stick Modernized - - - 70 Tack H Has A ic Feed 50 France Tests New “Cannon” Plane - - - 70 ACE Sees ae AUTOMATIC PEER: 5 a TA Women Stars Wrestle Under Water - - - 70 Gas Engine Powers Model Plane - - + 381 Model Reproduces Logging Scene - - - 72 English Improve Trafic Signals - - - - 58 | Broadcasts Düring Parachute Jump - + + 77 ; bd a as -| Craftsman Builds Steamer Mode - + + 77 md Lanp Has Twin Redectors ae Trapped Rat Shoots, Photographs Self - - 78 Harpoon Gun Spears Alligators - - + 62 | Photocell Is Lightning Arrester - - - - 78 “Beauty Micrometer” Analyzes Flaws - + 66 | New Liner Boasts Mammoth Range - - 78 Windmill Propels Pontoon Boat- - - - 66 Stops Cannon Ball With Stomach - - - 84 eras apes Plane Collects Air Impurities - - - - 85 Bog Hopper” Harvests on Soggy Ground - 67 | Second Dog Is Restored to Life - = = 85 Battery Drives Odd Rescue Craft - - + 67 | Crosses Channel With Paddle Device - - 86 “Paddle” Plane Needs No Rudder - - - 67 | Builds P layhouse from Oil Cans - -> + 86 Stand Holds Breakfast Newspaper - - - 70 Near Diamonds. from Hyewash z ~zs S -24-88 Lamp in Knocker Lights Keyhole - - - 70 FOR THE WORKSHOP FAN Solar “Oil Stove” Heats Oven - - - 71 s E ERRE i ; ‘ ee Amaze Friends With Sound Robot - - - 92 Lamp Iluminates Phone Dial at Copy With Simple “Cartoono-Graph” - - 96 Single Pedal Controls Tiny Car - - - - 71 | Make Bowls With Turned Log Slabs - - . 96 Device Projects “Micro Movies” - + + 72] Ice Sled ae Sailing ae =. if - + 97 e ; ee A Scrambled Pictures Add Zest to Puzzle '- 100 matety Bumper to: Cua Accidents 72 Painting and Gluing Secrets =- oe - 101 Easy Pressure Opens Lamp Guard - 3 - 77 Shop Kinks for the Handyman - - 104 Construct Fire Engine from Junk - - - 77 | Oil Burner Fears Workshop - - - -105 ; f : A aah act Drafting Table Handikinks - - - - - 109 ane Operates Without Flame us Radio Lamp Gives Subdued Light - - - 112 Electric Hotbed Controls Plants - - - ~- 84 Penguin Toy Amuses Children - - - - 113 Cream Siphon Is Self-Starting - - - - 84 Mechanical Pencil Holds Lighter- - - - 84 DEPARTMENTS Army Radio Simplifies Communication - - 85 Solving Readers’ Problems - - -10 Fire Extinguisher Sold in Tubes - - - 86 | Random Chips from the Editor’s Workbench - 18 Ci T.: H ve S mee ee Oe November Problems Contest Winners - + 26 nae ey a ie: peas s6 Newest Household Aids re 3 | Control Speed with Sliding Wing Plane - - 88 Sportsmen’s Campfire - - - - - - 80 Drive Meter Aids Golf Practice - - - - 88 | Needed Sevennon en -Y A Mower Guard Saves Nesting Birds - - - 88 A D E ee a oa Hacksaw Operates in Small Space - - - 88| Business Welcomes Needed Gadgers - - + 146 Published monthly by Modern Mechanix Publishing Co., 529 So. 7th St., Minneapolis, Minn., U.S.A. Not responsible William J. Kostka for unsolidted manuscripts. Contributions accompanied by Robert Page Lincoln Editor insufficient postage will not be returned. Entered as Second Hunting and Fishing Class matter Sept. 20, 1928, at Minneapolis, Minn. Copyright Editor 1934, Advertising offices Chicago, 360 North Michigan Ave.; A. Neely Halt New York, 52 Vanderbilt Ave. 15 cents a copy; $1.50 a year S. S. Rabil Workshop Expert in U. S. and Possessions. In Canada, 20c a copy; $2.25 a Naval Architect year. Other Postal Unions, $2.00 a year. Printed in U.S.A.

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Waar will you be doing ONE YEAR from today? Turee hundred and sixty-five days from now— what? Will you still be struggling along in the same old job at the same old salary—worried about tthe future—never able to make both ends meet? ‘One year from today will you still be putting off your start toward success—thrilled with am- bition one moment and then cold the next— delaying, waiting, fiddling away the precious hours that will never come again? Don’t do it, man—don’t do it. There is no greater tragedy in the world than that of a man whé stays in the rut all his life, when with just a little effort he could advance. Make up your mind today that you’re going to train yourself to do some one thing well. Choose the work you like best in the list below, mark an X beside it, and without cost or obliga- tion, at least get the full story of what the I.C.S. can do for you. INTERNATIONAL CORRESPONDENCE SCHOOLS “The Universal University” BOX 2319, SCRANTON, PENNA. * Without cost or obligation, please send me a copy of your booklet, “Who Wins * and Why,” and full particulars about the subject before which I have marked X: TECHNICAL AND INDUSTRIAL COURSES O Architect D Architectural Draftsman O Building Estimating DO Wood Millworking O Contractor and Builder O Structural Draftsman O Structural Engineer Q Inventing and Patenting O Electrical Engineer O Electric Lighting . O Welding, Electric and Gas O Reading Shop Blueprints O Business Management O Office Management O Industrial Management D Trafic Management O Accountancy O Cost Accountant, O Telegraph Engineer O Telephone Work O Mechanical Engineer O Mechanical Drafteman O Machinist O Toolmaker O Patternmaker D Heat Treatment of Metala O Bridge Engineer OD Bridge and Building Foreman O Gas Engines ( Diesel Engines D Aviation Engines O Automobile Mechanic O Plumbing (Steam Fitting O Heating Q Ventilation O Sheet Metal Worker O Steam Engineer O Steam Electric Engineer D Civil Engineer O Surveying and Mapping O Refrigeration D R. R. Locomotives OR. R. Section Foreman O R. R. Bridge and Building Foreman BUSINESS TRAINING COURSES OC. P. Accountant D Bookkeeping O Secretarial Work O Spanish O French D Salesmanship D Advertising O Service Station Salesmanship D First Year College O Business Correspondence U Lettering Show Cards D Signa O Stenography and Typing g DO Civil Service O Mail Carrier Occupation... D Air Brakes O R. R. Signalman O Highway Engineering O Chemistry O Pharmacy O Coal Mining Engineer D Navigation [O Air Conditioning O Boilermaker O Textile Overseer or Supt. O Cotton Manufacturing D Woolen Manufacturing O Agriculture O Fruit Growing D Poultry Farming O Radio O Marine Engineer O Railway Mail Clerk O Grade School Subjects O High School Subjects © College Preparatory O Illustrating O Cartooning If you reside in Canada, send this coupon to the International Correspondence Schools Canadian, Limited, Montreal, Canada Thank You for Mentioning Modern Mechanix and Inventions for January When Writing to Advertisers ~l

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M bain you If you are ‘dissatisfied with your present job—if you are struggling along in a rut with little or no pros- pect of anything better than a skin- ny pay envelope—Clip and Mail the Coupon NOW! Get my big 64-page 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. - Feal Opportunities Ahead in Radio for Trained Men It’s hard to find a field with more opportunities awaiting the trained Broadcasting Stations Employ managers, engineers, opera- tors, installation and maintenance men for | Si paying up to i 5,000 a year, g a JE. Suite: hy in 1938—one of thi t Loud S$ , man. Whyin of the wors Apparatus Fros. National made depression years—the Radio industry Installation and ser- vice work is another growing money-mak- ing field for trained dio men. The man who has directed the Home Study Training of more men for the Radio industry than any other man in America, sold $218,000,000 worth of sets and parts ! Radio set sales INCREASED 45%—tubesales INCREASED 25%! Over 300,000 people worked in the industry ! It’s a gigantic business, even in the worst business years. And look what’s ahead! Millions of sets are going out of date annual- ly. 18,000,000 sets are now in operation on which over $200,000,000 are spent EACH YEAR for repairs, servicing, new tubes, ete. Broadeasting stations pay their employees {exclusive of artists) approximately $23,- 000,000 a year. Advertisers pay 600 great Broadeasting Stations over $75,000,000 ayear for Radio time and talent. A few hundred jobs that paid $40, $60, $75 a week 20 years ago have grown to thousands. These figures are so big that they’re hard to grasp. Yet they’re all TRUE! Here’s a new- industry that -has-- grown to he a commercial giant! No wonder great business leaders pređict a brilliant future for the great and grow- ing Radio-industry. Set Servicing Spare time set servic- ing pays many N.R.I. men $5, $10, $15 a week extra. Full time men make as much as $40, $60, $75 a week. l | | Some of the Many Other Jobs | | N.R. L Trains Men For | Radio Service Business of your own || Spare time Radio Service work 1 | Retail Sales of Radio Sets and Equipment | | Service Expert for Retail Stores I'll show you how to use my special Radio Equip- ment for conducting experiments and building circuits used in such well-known sets as West- inghouse, General Electric, Philco, R. C. A.- Victor, Majestic and others. You work out with your own hands many of the things you read in our lesson books; This 50-50 method of train- ing makes learning at home easy, interest- ing, fascinat- ing, intensely practical. You learn how sets work, why they work and how to make them work. Broadcasting Station Operator Aireraft Radio Operator Ship Radio Operator 3 H Loud Speaker Systems, Installation and | Service Auto-Radio Installation and Service Television Station Operator i Commercial Radio Station Operator | Short Wave Transmitter Installation and | Maintenance 4 Designing and Building Testing Equipment | Service Expert with Radio Factory i All-around Servicing Expert ! Thank You for Mentioning Modern Mechanix and Inventions jor January When Writing to Advertisers

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ADIO EXPER MAKE $40 $60 $75 A WEEK Get Into This Field é. With a Future There’s opportunity for you in Radio. Its:future is certain. Television, short wave, police Radio, automobile Radio, loud.:speaker systems, aviation Radio, marine ‘Radio—in every branch develop- -ments and improvements are taking place: - Here is a real future for addi- tional thousands of trained men who real- ly know Radio. Get the Training that opens the road to good pay and success ! ` Send me the Coupon NOW—and get full ., particulars on how easy and interesting .Imake learning at home. Read the letters „from graduates who are today earning real.money in this fascinating industry. Learn at Home in Your Spare Time To Be a Radio Expert Hold your job. There is no need for you to leavé home. I will train you quickly and inexpensively in yoursparetime. You don’t have to be a high school or college graduate. My Course is written in a clear, interesting style that most anyone can grasp. I give you practical experience un- der my 50-50 method of Training—one-half from Lesson Books and one-half from practical experience with equipment I give you. This unique and unequalled method has ‘been’ called one of the greatest devel- opments in home study Radio training. Many Make $5, $10, $15 a Week Extra in Spare Time While Learning My big _64-page book gives proof that many make $5, $10; $15 a week extra servicing sets in theirsparetimesoon after enrolling. I give you plans and ideas that have made good spare time money—$200 to $1,000 a - Mail coupon jer FREE PROOF year—for hundreds of fellows. My Course is famous as “the onethat pays foritself.” 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 Lesson and Instruction Service upon completing, your Course. 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 fulltime job opportunities; it tells you about my Course ; what others. who havetakenit are doing and making. Find out what Radio OFFERS YOU—without theslightest obli- gation. MAIL THE COUPON in an envel- ope, or paste it on a penny postcard NOW. J. E. SMITH, President NATIONAL RADIO INSTITUTE Dept. 5AH, Washington, D. C. J. E. SMITH, President Washington, D. C. Clears $4,500 In 18 Months “Before taking your Radio : Course I was making $18 a week. I came here three years ago. In about 18 months I made about $4,500 in Radio. I cannot say too much for the wonderful help I have received from N. R. I.’’—NOEL W. RAY, 619 Broad St., Gads- den, Alabama. Spare Time Work Pays $18 A Week “I do only spare time Radio work and average $18 a week. People who in good times would buy a new Radio now have the old one fixed.’’—STEPHEN J. DRAPCHATY, 407 Wunder- lich Avenue, Barberton, Ohio. Now Owns Own Business “Tf I had not taken your Course I would be digging ditches instead of run- ning my own business. One week I made $75 on repairing alone, and this doesn’t count sales. If a fellow wants to get into Radio, N. R. I. is the starting point.’’— R. S. LEWIS, Modern Radio Service, Pittsfield, Ohio. National: Radio Institute, Dept. 5AH : a Dear Mr. Smith: Without obligating me, send your book which points a out the spare time and full time job opportunities in Radio and your 50-50 method of training men at home in spare time to become Radio Experts. (Please print plainly) . | EE ye ee ee ee ee en ee ee ee ee ee et ee Thank You for Mentioning Modern Mechanix and Inventions for January When Writing to Advertisers

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The Problems Editor answers reader queries on varied subjects. ASCENSIONS WITH HOT AIR BALLOONS ` Can safe ascensions be made with balloons which depend entirely upon. hot air for their lifting pow- er?—E, F., Montevideo, Minn. Powerful hot air balloons can be built in. the workshop having a sewing: machine. Fireproof material is not suited for the cov- ering because of its increased weight,. but a good grade of unbleached muslin, with about 80x90 thread count has proved: satis- factory. A pear-shaped balloon, 60 feet high: and 40 feet in diameter is the type mest’ commonly used to lift a man. Hot air balloons can be regulated to come down safely at about the same rate of speed as a parachute. Because of the danger in- volved, ascension should not be attempted without a parachute. Kerosene is usually burned to supply the hot air. BURNED-OUT XMAS LIGHTS Is the practice of jamming tinfoil into Christ- mas tree light sockets when replacement bulbs are not available dangerous in any way?—R. S. M., Altoona, Ill As many as three sockets in the ordinary Christmas lighting circuit may be shorted out with tinfoil for a few hours, until new bulbs can be obtained, without apparent damage to the remaining lights. This prac- tice is not recommended for any longer period, however, since voltage on the re- maining bulbs is raised proportionately and their period of life shortened. WHY DOES TOP WATER FREEZE? If water at the surface of a lake is warmer than that near the bottom, why should ice always be- gin forming at the surface? —R.M.O., Atlas, Mo. At temperatures above 39.2° Fahrenheit, colder water is always heavier, and sinks to the bottom of the lake. Below this critical temperature water exhibits one of nature’s most remarkable phenomena, a_ given amount actually becoming lighter in weight as it is cooled further. As the temperature approaches the freezing point of 32° F., all 10 of. the cold: lake bottom water has risen to the top, where it changes into ice. REMEDY FOR SLIPPING CLUTCH How. can slipping be stopped in a motorcycle clutch? The flywheel is covered with brass and the- drive wheel with 14” thick leather.—J.F.M., Altoona, Pa. In. most cases it is grease which causes slipping. If this hardened grease cannot- be washed off with gasoline, try burning it by careful use of a blow torch. Talcum pow- der or pumice sprinkled lightly over the clutch face also proves helpful. FREEZING HONEY FOR CONFECTION Some time ago I noted in M-M a short article describing a frozen honey confection. Can you give me a recipe for preparing this?—M.S.H., Sault Ste. Marie, Mich. l A mixture of honey and water, with or without additional sweetening, is frozen as one would freeze a sherbet, then attached in lumps to a stick. The presence of. the honey acts to prevent the formation of large ice crystals. AUTO IGNITION PHENOMENA After running my auto engine for an hour with very little water in the radiator, I noticed that the engine ran for over a minute after the igni- tion was switched off. Was this engine running on the Diesel principle for that short interval, even though it is not a high compression motor?— E. W., Guys Mills, Pa. With a reduced amount of water in the cooling system, it is very probable that the exhaust valves were operating at a red-hot temperature, and igniting the gasoline after ignition was cut off. This could hardly be compared to. the operation of a Diesel en- gine, where gases are compressed to: the point where they ignite themselves. BULLETS MISS EMPTY EGG-SHELL In Nic Sprank’s Oddities of Science some time ago an item. stated a marksman could not hit an empty egg-shell: hung from a yard long thread, at (Continued on page 14)

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Amazingly Easy Way to Get Into ELECTRICITY PAY YOUR TUITION AFTER GRADUATION Don’t spend your life walting for % ralsea {na dull, hopeless job. Now ... and forever, .,eay good-bye to 26 and 85 dollars a week, Let me teach you how to prepare for positions that lead to salaries of $50, $60 and up a week In electricity—NOT by correspondence, but by an amazing way to teach right herein thegrest Coyne Shops that makes youa practical electrician in 90 days! Getting Intoe lectricity Is easier than you imagine forright now I am making an offer nootherachool ever dared to make. PAY FOR YOUR TUITION IN EASY PAYMENTS AFTER YOU GRADUATE. LEARN BY DOING — IN 90 DAYS BY ACTUAL WORK-=In the Great Coyne Shops 1 don’t care if you don’t know an armature from an air brake—I don’t expect you to! It makes no difference! Don’t let lack of money stop you. Most of the men at Coyne have no more money than you have. at's why I have worked out tonishing off below for tie tase’ my astonishing offers, Mail coupon EARN WHILE LEARNING If you need part-time work to help pay your Hving expenses I'll help you get it and when you graduate I'll give you lifetime employment service. And, in 12 brief weeks, in the great roaring shops of Coyne, 1 train you as you never dreamed you conld be trained. . on one of tha greatest outlays of electrical apparatusever assembled, . real dynamos, engines, power plants, autos, awitehboards, transmitting stations .. everything from door hells to farm power and lighting . . full sized .. in full operation. ELECTRICAL REFRIGERATION Right now I am including my big new Electrical Refrigeration Course, I train you on real el cal machinery ... building real batteries... winding real armatu o ii ona g ae res, perating real motors, dynamos and genera» GET THE FACTS fogir orerresteheng toast into electricity. Every obstacle ig res moved for youdon'thavetopay for your tuition until after you graduate then you have ten months to pay it in small payments starting 2Zmontha efter you duate. This school ia $3 years old—Coyne training ia tested —proven eyondall doubt—endorsed by many large electrical concerns. Yon can find out everything absolutely free. Simply mall the coupon and let me send you the big, free Coyne book of 450 photographs EER facta ...joba... salaries... opportunities, Tella you how many earn expenses while training and how we assist oor graduates in the fald, No obligation to you. act at once. Just mail coupon. 2 (] Send for my big book containing 150 pho- ig 00. ree ? tographs telling the complete story — ab- solutely FREE. H.C- LEWIS, President COYNE ELECTRICAL SCHOOL 500 8. PAULINA ST., Dept. 15-53 CHICAGO, ILL. COYNE ELECTRICAL SCHOO! . C. H RRE Street, ICAL SCHOOL. N Ga Lows, Pres, ar Mr. ls: Without obligation send me your big, free catal $ and all details of Free Employment Service, a8 well anal details on l pont tice Refrigeration Course, and how many “‘earn while learn- p; 10g.” Also about your “PAY AFTER GRADUATION” offer, Name . verasasovessuosssooacooosooososseosovasososacogovese e T AA iy 1 5 i] ’ BY ACTUAL WORK ON REAL EQUIPMENT PA FOR YOUR TRAINING IN SMALL MONTHLY PAYMENTS AFTER YOU GRADUATE Come to Coyne nowt Get your training In the World's most fascinating, best paid profession, I train you at Coyne ina practical way so you can be prepared to take a real Job and cash in quickly, and, I'LL FINANCE YOUR TRAINING. Two months after you are trained you can start paying me back in eesy monthly, payments from your earnings. Take over 2 year to pay AFTER training. ail the coupon today for details of this plan. REAL OPPORTUNITIES FOR THE RADIO TRAINED MAN Prepare for jobs as Designer, Inspector and Tester—as Radio Salesman end in Service and Installation—as Operator or Manager of a Broadcasting Station—as Wireless Operator on a Ship or lane—as a Talking Picture or Sound TT HUNDRE S of Opportunities for fascinating, WELL PAID 10 WEEKS’ SHOP TRAINING AT COYNE IN CHICAGO—YOU DON’T NEED ADVANCED EDUCATION OR EXPERIENCE I don’t teach by book study. You get your trelning at Coyne by ACTUAL WORK on & great outlay of Radio, Broadcasting, Television, Talking Picture and Code equip- '' ment. And because we cut oub useless theory, you get a practical training in 10 weeks, and that is why you don’t Need advanced education or previous experience. TALKING PICTURES—TELEVISION Talking Pictures, and address systems offer t oppor- tunities to the trained man. elevision is the great new branch of Radio which is now belng developed very rapidly. Be ready for your chance in Television, At Coyne you are tralned on real Talking Picture and Television equipment. Electric Refrigeration—Air Conditioning Included at NO EXTRA COST So that my graduates may have an all around training which increases thelr earning capacity, I am including for a short time my big new course In Electric Refrigeration and Air- Conditioning. Here js your chance to get & practical traln- | ing in this great new field at no additional cost. SPARE TIME WORK WHILE LEARNING WHEN YOU ENROLL AT COYNE YOU GET A LIFE SCHOLARSHIP. You get Free Employment Service for Life after gradustion. And if you need part-time work while at school to help pay expenses, I'l help zon get it if you will tell me your problems, Coyne s 35 yeare old. Coyne ining la teated— You find out svervtbing about my course and m pay after graduation plan” free. JUST MAIL Coupon for My BIG FREE OOK. H. C. LEWIS, President Radio Div., COYNE Electrical School 500 S. PAULINA‘ST., Dept. 15-1H, CHICAGO, ILL. H. C. LEWIS, President Radio Division, Coyne Electrical School 500 S. Paulina St., Dept. 15-1H, Chicago, IN. Dear Mr. Lewis: Send me your Big Free Radio Book and all details of your Special Introductory Ofer—and your plen where í can pay my tuition in easy monthly payments after I graduate, | Name. vaccsasseresceeeereenves ceneeeensnenecneeenreceenen ] Address ssesesovesosevosocoosevosserosospeesecoerorosseroes ee ee ee ee ee e e e] Thank You for Mentioning Modern Mechanix and Inventions for January When Writing to Advertisers ll

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Profited by this MANY LITTLE IDEAS HAVE BIG COMMERCIAL POSSIBILITIES The Paper Clip Often some simple, little article will prove to bea big commercial success. Take an ordinary paper clip; just a piece of twist- ed wire, yet they are sold by the millions every year. Wooden Golf Tee Another little article now used by thousands is the wooden golf tee. For years golfers made GA their tees with clay or wet sand. Then a man had a hunch to make a tee of wood. The idea was worth a fortune. Metal Bottle Cap Here’s the ordinary metal bottle cap, used on beer and soft drink bottles. Its inventor, Wiliam Painter of Baltimore, built a big business and became wealthy with this simple idea. Hair Pin One day a husband noticed his wife bend her hair pins to make them stay put. That gave him the idea for hair pins with kinks, He patented the idea and is said to have reaped tremendous profits. Shipping Tag Before Dennison in- vented a shipping tag with a reinforced eye- let, tags gave much trouble because they pulled off the strings intended to hold them in place. Yet see how simple Dennison’s idea was. This is another little article which be- came the basis for a very large business. OTHER MEN Have Read and HIS book was prepared for men of ideas— men who have an article in mind that will make money, save mon- ey, save labor or give pleasure. Leading thinkers agree that the op- portunity for the inventor is as great today as ever before—that the world of a few years from now will be radically different from the world of today because of the contributions to progress that inventors will make. Now is the time—if you have an invention —to see about fully protecting it so that you can be sure of your just share of whatever profits it may make. C. F. KETTERING Vice Pres., General Motors Says This About Invention In statement in Good House- keeping Magazine, Charles F. Kettering, who helped develop the self-starter, Duco, and other important inventions, said: “Our return to normal times de- pends on new manufactured products that will catch the pur- chaser’s eye, get him to buy and start the ball! rolling. Change and buying go together. Were only entering the great period of inventive advancement.” Improvements Can Be Patented Don’t think that to be profitable an idea needs to be complicated. Simple articles—like those shown here at the left—have ats a often proved profitable. Also improvements on patented. arti- cles sometimes are more valu- ‘able than the original article it- self. If you have an invention. —at least see what its possibili- ` ties may be and HOW YOU CAN PROTECT YOUR OWN RIGHT TO IT. Don’t Delay—Send for this Free Book Now Many a man has waited until too late to protect an invention. by means of a United States Patent. Remember that someone else may be thinking along the same lines that you are; and the Patent Laws place the burden of PROOF on the man who files his Patent Applica- tion last. You may have much to gain—and nothing to lose—by act- ing promptly. Learn the important facts about Patent Protection at once. 36 Years of Proven Service For thirty-six years this organi- zation of Registered Patent Attor- neys has served inventors from all over the country—all over the world in fact. What you write us Is held In strict confidence. We have a large staff of patent spe- cialists to give you expert and prompt service. Yet because ofa highly efficient organization, our fees are low; and we also help you with deferred payments. The cou- pon makes it convenient for you to communicate with us at once. Use it today. 12 Thank You for Mentioning Modern Mechanix and Inventions for January When Writing to Advertisers

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IMPORTANT With this interesting book, you will also find an “Evidence of In- vention” form, which makes it easy for you to sketch and describe your idea as a‘matter of record. . This is an important step if you haven’t taken it al- ready. The book will tell you how to use this record and why. It also ‘comes to you without „any charge or obliga- tion.

This Book TELLS YOU: How the Patent Laws protect you and why, if you- have an invention, you need a Patent at all. What to do to make application for a Patent; just what information a Patent Attorney needs to help you. ‘ What. kind of a sketch or model is needed. | What simple steps you may be able te take right away to help claim your right to your invention, even before you make application for a Patent. How some successful inventors have secured finan- cial assistance to help them in the development of their inventions. Tells you about interesting inventions that have proved successful and illustrates important me- chanical principles that inventors frequently use in k PATENT PROTECTION is much han a b ATEN ECT: s much more than a book per : = nmn about patent procedure. In it we have put the M. 3 L Ti 1 à k = kind of information that we know from long ex- i, H N (OF i perience the average man with an invention would $ 5 = like to have. The very same day we hear from you—a free copy VICTOR J. EVANS & CO., | Sou. Bled and vend the coupon Gey That much MAIN OFFICE: 520-A, VICTOR BUILDING, | done today. WASHINGTON, D. C. Other Offices: 1640-B Conway Bldg., Chicago; 1007-B Woolworth Bidg., New York; 514-B Empire Bidg., Pittsburgh; 1010-B Hobart Bidg., San Francisco; 736-B Security Bldg., Los Angeles. I am interested in your book, PATENT PROTECTION, and your Evidence of Invention form. Please send both of them FREE and without obligation on my part.

NAME: asec cca s a5 eS ANGAR tee ‘ Street and No...........-cces eee enee City or TOWN sisi es vegas <a eect es cd Seine Oe heated one es HOTATOS aaien a (Be Sure to Write or Print Name Carefully) d 520A VICTOR BLDG., WASH. D C. Thank You for Mentioning Modern Mechanix and Inventions jor January When Writing to Advertisers 13

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‘South Bend Lathes eared, Screw Cutting Pr Back 480 16” x 6’ Standa Change Gear Lathe with Counter- $ shaft and Complete Equipment as shown......... $100 Down—$29 per month for 14 months 96 SIZES OF LATHES $75 to $1500 E YOU have work for a lathe, why be without it when a small down payment will Jee the lathe in your shop immediately. Before you consider a second-hand lathe, with perhaps many attachments missing, look up the prices of a new South Bend Lathe. You deal direct with the factory and make your payments directly to us, “Satisfaction guaranteed or your Money Back.” 96 sizes and types of Lathes with Countershaft and Motor Drive available. Below are listed a few popular sizes. Size of Lathe Cash Down Monthly (Countershaft Drive) Price Paym’t Paym’'t 9” x 3’ Workshop Bench Lathe $ 85.00 $ 21.00 7.00 9” x 3’ Toolmaker Bench Lathe 140.00 31.00 t 9.00 9” x 3’ Junior Bench Lathe 170.00 35.00 11.50 9” x 3’ Std. Change Lathe 235.00 50.00 17.00 11” x 4’ Sed. Change Lathe 300.00 60.00 19.50 13” x 5’ Std. Change Lathe 352.00 75.00 25.00 18” x & Std. Change Lathe 635.00 125.00 34.00 ee a a WHITE for a quotation and illustration of the size you are interested in. Let us know the kind of work you wish to do and we will recom- mend the size and type of lathe practical for your shop, with itemized quotation on equipment recommended. No charge for this service. RA SOUTH BEND LATHE WORKS 506 E. Madison St.. South Bend, Ind. BUILD YOUR OWN TELESCOPE Same type as 100” Mt. Wilson Telescope. No experience or special tools needed. We furnish complete set of in- structions and all necessary materials at lowest prices. Send 10c for catalog including complete instructions for building your telescope PRECISION OPTICAL CO., 99f E. 163d St., NEW YORK ON YOUR PRESENT RADIO New Marvel Police Adapter brings them @ in clearly on your old set. Simple attach- ment provides reception you have never had before. Quickly attached to any set, Full directions ineclosed. ‘Takes less than 5 $1.00 F Get minutes to connect, No tools! No drilling! Postpaid Toke No soldering! POLICE—AMATEUR |JOBBERS — DEALERS SHORT WAVE CALLS Delight your friends {vlth a new type of entertainment! There's lots on the air that is exciting. You can get it— with fhe Marvell Dealers and Jobbers write quick. Sample mailed anywhere, Postage prepaid, fur only $1.00. SPECIALTIES MANUFACTURING CO. 3836 Grand River Ave. Detroit, Mich. 14 Get surprises on radio lead- in and aerlal wire; ground clamps; window leads; Ver- nier dials; radio knobs;, auto antennae; push-back wire and shielded wire. Problems Editor Answers Queries (Continued from page 10) a distance pf 50 feet. Using a .22 caliber long rifle bullet at a distance of 75 feet, I put a hole right through the center of the shell. Could you tell me why it was possible to make this shot? — E.W.H., San Francisco, Cal. A bullet traveling at high speed pushes a certain quantity of air ahead of it; this air, hitting the light egg-shell in advance of the bullet itself, will push the shell to one side. With a direct hit such as was made in the above case, the shell is pushed straight back instead of to one side, but not enough to dodge the bullet. OVER-DATES ON COINS I have a large copper U. S. cent in which the date numerals appear to have been changed from 1810 to 1811. Can you tell me how much this coin is worth?—F.V.R., St. Louis, Mo. The same die from which the U. S. one cent pieces of 1810 were struck was used in 1811 by sinking a “1” over the “0”. Though por- tions of the latter figure are still visible,, the coins are considered as issues of 1811... -A prominent coin buyer is paying from 25¢ to $2.50 for this coin, depending upon. its condition. f HOOKING UP CONDENSER MIKE What size transformer should be used in hook- ing up a home-made condenser microphone to a radio set?—D.B., Colton, Cal. Good results may be obtained by connect- ing the microphone in series with the pri- mary of a standard 3-1 ratio audio transform- er and a 45-volt B battery. The transformer secondary is connected to the grid and cath- ode of your radio set or to the input terminals in the event that an amplifier is being used: AUTO GOES FASTER WHEN COLD My 1922 Dodge car will make 60 m.p.h. in the morning, but after driving for about two miles, I cannot get it to go faster than 45 m.p.h. Although there is no steaming, the water rumbles in the en- gine itself. Can you suggest a remedy?—Y.L., Lewaren, N. J. ` If compression before the car is started is considerably better than after the car has been driven a few miles, the trouble is un- doubtedly due to warping of the exhaust valves with heat. The valves will seat prop- erly when the engine is cold because they were ground at that temperature. The remedy is new valves of the heat-resistant type. 4 SHRINKING CLOTH ON FRAME Is there a solution available at a reasonable price which, when applied to cloth stretched over a frame, will cause it to shrink? —E. W., Guys Mills, Pa. Ordinary airplane dope, sold by all avia- tion supply houses, will shrink cloth with- out reducing its strength. (Editor's Note—All letters sent to this department should include a stamped, addressed envelope. Write to M-M Prob- lems Editor, 529 South 7th Street, Minneapolis, Minn.) Thank You for Mentioning Modern Mechanix and I nventions for January When Writing to Advertisers

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Do you want money ?—a small fortune ?7—$2,500.00 in -Yeal cash? Here’s your opportunity. This is our sensa- tional way to advertise and extend our business. We are actually distributing THOUSANDS OF DOLLARS IN CASH—MODEST FORTUNES—CASH PRIZES TOTALING OVER: $5,000.00—BESIDES THOUSANDS OF DOLLARS IN EXTRA CASH PROFIT REWARDS. You may share in this cash. Would you like to win $2,500.00 all cash or Buick and $1,000.00? Can You Name 5 Movie Stars? DON’T SEND A CENT — JUST DO THIS NOW! Can you name 5 Movie Stars whose FIRST OR LAST NAMES begin with any letter in the following sentence: “WIN TWO THOUSAND FIVE HUNDRED DOLLARS.” Will Rogers is one. Norma Shearer is another. Can you name 5 or more? Write the names in coupon below or on penny postcard and mail quick and learn how you may share in these thousands of dollars. No prize less than $5.00 cash. Someone wins $2,500.00—why not yon? In case of final ties, duplicate prizes will be awarded and paid, Not a Cent of Your Own Money Needed on Our Clever Plan Maybe this grand opportunity sounds like a dream—but hundreds have already won prizes in Bonnie Day friendship campaigns. Here are pictures of a few. Now comes your chance. No subscriptions ta buy or sell. This is not a lot- tery. No luck needed.. No slogans to write. No more puz- zles. Imagine the joy of winning $2,500.00! Cash for Everybody Who Takes an Active Part Not only one person but everybody who answers has an opportunity to receive cash returns. The more the merrier. You can be sure to receive cash if you take advantage of my unique plan. I want quick advertis- ing — quick action—and I’m willing to pay for it. Think of the joy of winning $2,500.00. More money in one lump than most people save in a lifetime. Mail coupon now! $1,000.00 EXTRA to First Prize Winner for Promptness They say promptness pays! I will award $1,000.00 extra to the First Prize Winner just for promptness in following my plan. Do you want it? I want QUICK ACTION! $10,000.00 REWARD will be paid to any worthy charity if anyone can prove that we do not really award all these thousands of dollars in Grand Prizes—or if money to pay same is not in Bank—or if we will not fulfill every Guarantee we make to you. E.G. TEIMER MIN. DON PARMELEE, Prize Mgr., Dept. 236 112 to 114 Eleventh St. Des Moines, Ia. IWỌ 4,140% MR.GUSTAFSON IND. | WON 1750% EDNA HOXEY ILL. AMRS. covooE FLA. HUNDREDS HAVE WON BIG CASH PRIZES WOULD YOU, TOO, LIKE TO NO CONNECTION WITH ANY OTHER FIRM OFFERING PRIZES| z Thank You for Mentioning Modern Mechanix and Inventions for January When Writing to Advertisers All Grand Prize Money Now in Bank The money to pay every Grand Prize winner is deposited in the Home. Savings Bank in Des Moines (assets over $1,500,- 000.00). We are a reliable firm. I invite you to look us up through any credit agency, any bank in Des Moines, any busi- ness house, railroad, express company, magazine, newspaper. We are well known national advertisers. Send No Money--RUSH COUPON Many who won cash prizes in campaigns like this thought they didn’t have a chance, Imagine their surprise when they won! Write names of Movie Stars in coupon or on penny post card. DON’T SEND A CENT. For replying I will tell you how you may share in thousands of dollars extra in cash profit rewards and win $2,500.00, too. Nothing to lose — every- thing to gain. Answer now. 7 Scucsearnsaunscccnoosesesensnssteneutsensascossene Don Parmelee, Prize Mgr., Dept. 236 i 112 to 114 Eleventh St., Des Moines, Ia: I have written Movie Stars’ names be~ low, and I am anxious to win. ` My Name.... Addreee2i2: 6 ...c2:sisdc ENE E ee Mark in square below which you would prefer if you should become the First Prize er, 0$1,000 & BUICK OR [1$2,500 CASH 15

Page 16

Burlington’s Diesel-powered ‘Zephyr’? used only $16.72 worth of fuel oil in ita 1,016. mile non-stop ran from Denver to Chicago Photo courtesy Burlington RR: $ 'ngineering - The Diesel is fast replacing old-type engines .in locomotives — ships — industrial and commercial power plants — motor cars and trucks — aircraft — tractors. Aga result, many old jo bs have been great! changed or actually wiped out. 9 y New Jobs For Old Every Industrial change throws many good jobs into the discard—but it creates more and better jobs. The automobile ruined scores of industries based on pro- viding horse transportation — but the motor Industry employs even greater armies of workers. Radlos sup- planted talking machines — electric refrigerators wrecked the iceman — air conditioning is driving out ola fastened heating and ventilating systems, Diesel Engineering is the great opportunity of to- day. The field is developing with amazing rapiait on land and water and in the alr. This Is your oppo tunity to get In on the ground floor of a new and pros- perous Industry that will provide plenty of good jobs during your lifetime. is Your Job Safe? There is a growing scarcity of men trained to install, operate, and service Diesel engines. New Diesel Engi- neerlng Course—just released for home study by one of America's leading educational institutions — will give you, ina short time, thorough training in modern Diesel engine practice. AN texts furnished. Send TODAY for Free Bulletin. No obligation. American School Dept.D-128, Drexel Avenue at 58th St., Chicago, Your Height Increased in (4 days or money back! The wmaz- ing Stebbing Sys- tem soon brings 3-5 Inches Increase, new ‘‘pep’’ and energy. A valuable Health Course and ‘‘Success and Popularity’ Course included FREI with Sys- tem, sent complete for $2.00. Send for convincing Free Book with testimonials and Guarantee in plain sealed envelope. WRITE NOW TO: 0 STEBBING SYSTEM Dept. M. M. (0, FOREST HILLS, NEW YORK MAKE E YOUR OWN MOTORS Model T Ford Generator makes %4 H. P. Motor, reversible and variable speed up to 7000 R. P. M. Dodge 12 V Generator makes $% H. P. Motor. ee Other Generators can be used. All operate on regular asses or 32 volt current. Complete, illustrated and tested plans so simple a boy can use. Regular price $2, now $1 for a limited time only. Be sure to mention kind of Generator and current. You can sell these motors at a nice profit. Money back if plans don’t work. RAND CO., Dept. 102, 2004 Grand Ave., Kansas City, Mo, Whata thrill when you play your first tune, the very first week, on a P-A Sax. Then popularity .. admir- ing friends, good times, & glorious future. Try anew model P-A Sax, Trumpet, Trombone, Clarinet at your local music store, or write for beautiful litera- ture. No obligation. Easy terms. Write today. 1144 PAN-AMERICAN 4 130 P-A Bidg., ELKHART, IND. | DEVELOP and PRINT SNAPSHOTS YOURSELF Mako money—Sare money—Make Better Pictures by Developlng and Printing your snapshots at home. Make more prints from your old negatives. Learn a fascinating and well-pay- ing profession with a Winner Photoset. Not a toy but a scientifically designed kit containing enamel trays, glass graduate, stirring rod, de- veloper powders, fixing powders, printing frame, rinting paper and reliable Instruction book. nly $2.26 delivered in U, S. A. : De Luxe Set with professional type equipment for the more advanced worker, ......-.:e.10+ $3.95 IN MFG. CO. Dept. 98 124 West 23 Street New York \ PHOTO-SET LEARN TO DANCE LEARN THE LATEST LEAD AND FOLLOW BROADWAY STEPS A T H o M E Correctly, Gracefuily This new, simple method teaches you quickly and easily. 20 DIF- Æ FERENT STEPS FOR ALL MODERN DANCES. TANGO, WALTZ. The modern FOX TROT. ‘The dreamy 7; WALTZ. The latest SOCIETY STEPS will mako EA you HAPPIER, HEALTHIER, MORE POPULAR. YOU'LL ENJOY DANCING. Money back if not satished after 10 days’ trial. Don’t be a wall- flower, GET SOME ENJOYMENT OUT OF LITE! Write for full particulars, without obligation, to IRVING SCOLNICK, 147 West 42nd St., New York No JoKE To BE DEAF =-Every deaf person knows that— Mr. Way made himself hear his watch tick after eing deaf for twenty-five years, withhis Arti- ficial Ear Drums. He wore them day and night. f: They stopped: his head @ N a noises. They are invisible andcomfortable,nowires or batteries, Write for TRUE STORY. Also d ; ee THE Wi ArtifictalEar Drum THE WAY COMPANY i 741 Hofmann Bidz. Detroit, Michigan ` 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, HI. RAISE RABBITS FOR US WE PAY YOU UP TO $5.00 EACH. ALSO PUT YOU IN TOUCH WITH MARKETS ~ EVERYWHERE, Large illustrated book and. 2 catalog, also copy of the AMERICAN RABBIT FARMER and monthly market bulletin show- ing names of buyers in various parts of Ameri- ; ne ca who continuously buy all rabbits offered c them. All for 10 cents. Address OUTDOOR ENTERPRISE CO., 113 Main Street, NEW CITY, N. Y. a 8. Build it NOW - 1935 Trailer Pians and Parts Catalogue. - Send 9c for big illustrated brochure. NEW ideas, designs, parts, materials. Complete building instructions for above trailer, $1.00. Shop blue prints $4.00. Bridge frame construction, easy to build, sleeps four, ship’s galley, shower. AIRSTREAM TRAILER CO. ` 134 So. St. Andrews Place Los Angeles, Caiit. INSPECTOR | RAILWAY and BUS LINES Demand Men with this Special THAINING ACTIVE MEN—19 to 60—trained by our short, home-study course as Railway and Bus Passenger Traffic Inspectors ad- van ce quickly in this fascinating, healthful work, Travel or sta: near home. Complete our training and we will place you at ur to $140 per month, plus expenses, to start, Or rex fund tuition, Experienced men earn more. Costs % little: terms. Free Booklet gives 16-yr. record. g STANDARD BUSINESS TRAINING INSTITUTE Div. 6101 Bi lo, N. Thank You for Mentioning Modern Mechanix and Inventions for January When Writing to Advertisers

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OF : Golden Opportunities Await i Television-Trained Radio Men 6 Months Genuine Training at my. government licensed television broadéasting station W9XAL — 500 watts. S. Q. Noel, Pres. ELEVISION«

W9OXAL during famous movie stars.

$50 ENROLLS YOU A year to pay: balance if desired. Many of my graduates pay for their training after they: are through and “on the job” working in excellent positions at famous broadcasting stations. No Previous Experience Needed My master course starts you from the first and takes you, step by step, from elementary electri- city and radio up to and through the advanced television training. You need no previous radio experience—I will give it to you here in my mar- velously equipped ‘laboratories. If you have had gaa experience, I will allow you tuition credit or it. Thorough Radio Training Included | n my master course. Television is an advanced radio science and naturally preliminary course in radio must be of the finest. An average of 87% of my graduates pass their federal exam and re- ceive a radiotelephone operator license (1st class) —the highest broadcast license issued by the gov- ernment. Sound engineering and aircraft radio also included. Get Your License and Service Record While Here My students qualify for their licenses then serve as operators and control room men while tele- vision pictures are being broadcast. Your service record will be certified on the back of your license and you go out an experienced man. Licensed Men Given Preference these days because the industry wants thoroughly trained men more than ever— and television trained men are being selected for the good jobs. | There are no jobs for the half-trained novice. A gov't. license is a passport to a real job with a future. Free Employment Service i| while attending school and after graduation. I will assist you to find part time work to help defray living expense while in school. I will also give you free employment service for life on graduation. F FREE MAIL COUPON JOR FRP5 BOOK y premen < Student engineers qualifying for federal radio operator’s licenses. eS “Take it away” Student en- gineers flash actual broadcast on air. = E K x Buddy Rogers — another star — broadcasts over amous 9XAL. HOME OF W9XAL First National Tele- vision, Inc., occupies the four top floors of this beautiful new building. Here are my fine, fully equip-

MY GRADS SAY— Television Expert xI amin complete charge of television here and have: de- signed and supervised construc- tion of. all television apparatus. M. E. EISENBERG, in charge of Television Development’ at WDGY (also television station W9XAT), Minneapolis, Minn. Aircraft: Radio This is radio headquarters for TWA and-my depart- ment does all the service work for the entire Air Transport line. I got the job because I was a trained man —<a licensed operator. JACK MURRAY Transcontinental and: ‘Western Air, Inc., Municipal Airport, Kansas City, Mo. 3 Broadcast Station Operater Many thanks. for: securing this job for me. Your lab- oratory work is very” practical «.. a very helpful part of the course is the actual experience at W9XAL.. . and “riding gain” on sound programs. CLARK B. SMITH, Radiotele- phone operator (lst class), li- cense number 17-508. Radio Sta- tion WLBF. . z OTHER JOBS FOR FIRST NATIONAL GRADS Other jobs leading to $50: a week and up: Television Re- search Technician; Television Installation Engineer; Television Consulting Engineer; Radio En- gineer; Operator Broadcast Sta- tion; Aircraft Radio Engineer; Service.man on sound picture equipment; Service man on Pub- lic Address systems; Radio set service man;. Sales Engineer; Maintenance. Engineer; anid mary dAthora. i x ne es Ge ee es) S. Q. Noel, President Training Division FIRST NATIONAL TELEVISION INC., Dept. GG-1 Power & Light Bldg., Kansas City, Mo. $

ped laboratories and modern television stu- Dear Mr. Noel:

dios, with the very latest modern tele- tion to me. vision broadcasting equipment. W9XAL is licensed to broadcast pictures by author- Name -...-----2-2--eneeeeeeeseseete nescence ity of the Federal Radio Com- mission (not an amateur sta- Address

tion). Thank You for Mentioning Modern Mechanix and Inventions for January When Writing to Advertisers Send me your free book about television without further obliga-

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Mark Chapman built the trailer in two upper photos from MM’s Wanderer plans and PRIZE WINNERS won first prize of $5.00 this month. Photo of ice boat in circle brought second prize, $3.00, to Ed Shealy. Carl Rasmuson made the motorized bike with a washing machine motor and won third prize, $2.00. HEN you have a spare dollar or so, do you go down to the second hand shop, select an old piece of furniture, and then take it home to rebuild it into something so unusual that every visitor praises it? Or do you get some lumber, seclude your- self for hours or days in your workshop and come out finally with neatly finished furni- ture of your own design? If you enjoy doing these things, you will find a big contest offering 14 prizes totaling $125 in cash just suited for you in this issue. Turn to page 44. The contest is the second in a series of four offering $500 in cash prizes to MM Teaders. If you missed the first contest in the December, 1934, issue send 15 cents for «copy to Modern Mechanix Publishing Co., 529 S. Seventh St., Minneapolis, Minn. * * x A reader turns to MM for help to find someone with a seaplane who would be willing'to go into partnership on a venture seeking a fortune in gold in Canadian wilds. Here’s ‘his story: 56 St. Clair Ave., W. Apt. 5 Dear Editor: Toronto, Ont. "Tis with despair that I turn to ye! There 18 seems to be no one owning seaplanes around here with gambling spirit or gumption enough to go off on a prospecting venture up to the Long Sac area in northern Ontario, now a booming gold area. What I am after is a partner with a sea- plane. I have had some very valuable ex- perience in the field as well as my studies and laboratory work in mining engineering at school. It will not be necessary to fly with heavy loads as a base camp may be erected twenty miles from the transcontinental railway and most of the stuff may be sent via rail. I would like to state that I have the com- plete outfit necessary for a successful pros- pecting venture for two. I would also like to say that I have been successful in staking and selling gold claims in the vicinity of Sudbury. Harry C. Easton. If you want adventure and have a sea- plane, get in touch with Easton. And when you makc your gold strike, save a little nug- get for a camera and take a photo of your outfit for the Editor’s Workbench. + x * While space permits, we’ll give you the winning letters and photos in this month’s Modern Mechanix and

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Want to go prospecting for gold in Canadian wilds? An MM reader is seek- ing a pattner witha seaplane. And here’s another contest in $500 cash prize series. Workbench contest. First prize of $5.00 goes to M. H. Chapman for the photos of- his automobile trailer. His letter says: Baldwinsville, N. Y. Dear Editor: Bd Enclosed are snapshots of the trailer I built and used'this summer. I used for my model the “Wanderer” published in the December, 1933, issue of Modern Mechanix and Inven- tions. It is built on a Chev. 1929 front axle. It has sides of 1⁄4” masonite, top of canvas painted aluminum, and is nine feet three inches long, six feet wide and six feet high. Not having ac- cess to a welding outft I used oak throughout. The ‘windows are street car windows pur- chased from an abandoned line. I used the tire of an old lumber wagon wheel for the wheel Tiiath F Bec housing. 1s is the one-tube short wave Pi mode! described in the Octo- T he trailer ber, 1934, MM. G. D. Aydlett, weighs 1460 Ibs. of Norfolk, Virginia, built it. with all the equip- ment. It can sleep four persons and has traveled over the highway better than 50 miles per hour. M. H. Chapman. If you want to build as useful a trailer, for 50 cents you can get a copy of the 1935 edition of the.Handy Man’s Home Manual which inċludes drawings and all instruc- tions for “Wanderer.” Enlarged blueprints can be obtained for $1.00. Send your orders to MM. x * * Second prize of $3.00 was awarded to Edward M. Shealy. This is what he says about the ice boat shown in the photo: Madison, Wis, Dear Editor: Enclosed find picture of my ice boat which I built in my spare time in 9 days last winter. It was easy to build and the total cost includ- ing the sail was only $14.50. She carries 150 feet of sail and is lateen rigged. The sail is Inventions, January, 1935 Two fine locomotive models built by U. B. Graff. Top photo shows Pacific type and lower first Southern Pacific loco- motive. Both are built to scale one-fourth inch to the foot. an equilateral triangle 18’ on each side and is suspended from a mast by means of a hook. The boat does 50 to 60 m.p.h. Edward M. Shealy. Carl Rasmuson wanted a motorized bicycle and solved the problem easily and at low cost. His photos and letter brought him third prize of $2.00. After assuring us. that MM “is the best mag. on the market,” he says: Rockwell City, Ia. Dear Editor: I am enclosing two snapshots of a Maytag motor arrangement for a bike. It has friction drive on the rear tire through an old Maxwell fan pulley and a piston for an extended belt pulley. The clutch is held in with a spring. It is started by merely releasing the clutch lever when a little speed is obtained with the pedals. At first the speed was slow but I increased the size of the motor pulley and then got about 18 m.p-h. If anyone is inter- ested I can send details. Carl Rasmuson. (Continued on page 20) This ice sled, built by John Ceraska, can do 75 m.p.h, on ice. It has a home-made prop and a motorcycle engine. 19

Page 20

NEVER BEFORE SUCH A SMOOTH SHAVING BLADE at this low price! NOW! | PROBAK Also Trial Package NG), X of 4 Blades For 10c Yy “GENTLEMEN: “During the past few years I’ve been driven because of necessity into the lower- priced razor blades—my beard suffering because of the shortcomings of my pocket-book. Your Probak. Jr. has brought back shav- ing comfort at no extra cost. . “Sincerely yours, ; E. Eugene Leonhart, San Jose, Calif.” ' Unsolicited letters like this — prove the amazing quality | of Probak Jr. Try this re- markable blade—uniformly keen and smooth-shaving. Get Probak Jr. from your nearest dealer’s—a remark- able value at 25 blades for only. 59¢ or a special trial ` package of 4 for 104. Probak Junior fits all Gillette and Probak razors Chips From the Editor’s Workbench (Continued from page 19) Notice how parts of Rasmuson’s motor bike are identified on the photo by “let- tering.”’ Heres how to do the same with your pictures for the Workbench contests when the photos have details-that should be pointed out. Put tissue or transparent paper over the photo, either clipping it or pasting it to the back of the print. Draw arrows on the tissue to the parts to be identified and name the parts. Use a soft lead pencil and do not press on the glossy print. An artist takes care of the lettering when the picture is published. Gordon Lyons built this hydroglider. It is powered with a twin cylinder motorcycle engine. It travels fifteen m. p. h. Model railroading is one of the most fas- cinating hobbies for the workshop fan. Model railways are not considered toys but are exact replicas of equipment used on full sized railroads. This month on page 110:we tell you how to build an 00 gauge passenger coach. Plans and instructions for building a locomotive to go with it can be obtained from MM for 50 cents. The wheel gauge of the locomotive will have to be altered slight- ly, however, as it was intended for the Eng- lish system. Here is a letter from an exper- ienced model railroader: San Francisco, Calif. Dear Editor: I am sending you two photographs, The “old timer” is a model of the “Collins P. Hunt- ington,” the first locomotive of the Southern Pacific railway. This locomotive saw service as an express passenger engine. The second photo shows the “C, P.” standing alongside of its modern counterpart, a model of a light Pacific Type express engine. Both are quarter scal O gauge, that is 44” equals 1’. : U. B. Graff. If you are a model railroad builder, send a photo of your models to the Editor’s Work- bench. If you want more articles on building model railways, drop the editor a card. * * * John Ceraska sent us the picture of the ice sled. Here are the details: 58 E. Mountain St. Worcester, Mass. Dear Editor: I am sending you a picture of an ice sled I built. It is capable of doing 75 m.p.h. on ice (Continued on page 22) 20 Thank You for Mentioning Modern Mechanix and Inventions for January When Writing to Advertisers

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Send for ALLIED’S Big IA New 1935 Catalog, featuring K | Kits and Parts for build- 1 ing the new Short Wave and § World-Wide Radio Receiv- ‘ ers. We supply FREE parts || ¥ a lists for building any radio |\ a deserlbed in any magazine, Our prices are lower, g Write for our FREE Cata- J log. Address Dept, B, 833 W. Jackson Blvd, “Allied "Radio = CORP RATION 833 W. JACKSON BLVD., CHICAGO, IL IDEAL SUPER-DETAIL FLYING PLANES MOVABLE CONTROLS OPERATED FROM COCKPIT DESIGNED FOR YOU BY FLYING MEN You'd like an experienced flyer to help you lay out a plane with con- t work elevator, rudder and allerons from the cockpit, Thet’s what IDEAL doeal Experionced flyers who bave spent thelr lives designing and flying planes have laid out; these big, beautiful flying models. That’s why you learn-avl- ation principles bullding planes the ” Buildings, Etc. All Turn Siclns Pesce | agate vacant reer aat “WAR CONDITIONING Wingspan 21% in, Y] modele—perfect, complete in every detail. Wer Tae giya Ales neuden bit eh ute Ge and EAE tA Send check or money order today for the plane pictur- the Hew ed.Alsosend3cforfoldersho wing latest model planes. 26-28 West 19th Streat, Naw York City, N. Y. ; IDEAL AEROPLANE & SUPPLY CO.INC. For Economy BUY—For Income SELL The ẸIFEL- GEARED PLERENCH KIT: NEW 7” and 81⁄2” Sizes— Each wilh 3 instantly changeable Jaws A $50 Service at the Cost of One Tool! © MAIL this Ad Today with your address Coupon Get FREE—7-Edge End-&-Angle ° Trained Men Needed Now Serewdrtyer; 10L Pietinio Manual of Mechanics. wilh | Let Me Show You 200 manufacturers—1000 distribu- Offer, or C Distributor Territory and Free Kit Offer. ky H 37.000 deal iready da th rear ater e making $35 to $125 Weekly! saad © ow Easy You Can eee ode) mer ee ee a ench Man, t i A : AMERICAN enon Copp'y ^MM-4809 N, Ashland Ave. Get Started Now ployed — thousands more needed CHICAGO, ILL. s `. Por 3 good pay jobs in estimating, in in the Field Where stallation, maintenance, service, Thousands E ARN sales, and other branches. $ to Greatest Opportunity Since NOW— model of famous CB&Q ‘‘Zephyr’’. The 3 5 $7 5 Beginning of Auto Industry— finest, most modern electric train ever offer- Send ed. Cast al fectly stream- today for a week lined. individual shatter’ ont wid dows. {nformaticn, 30 Years Ago eo Trains, Factories, Public Why stick to a small-pay, no- -fu- ture job? Why waste your time in a business that’s standing still, or on the down grade? Get a job with RAYD.SMmITH à future! Clip and mail coupon for FREE Book and facts about opportunities in the newest and MAIL fastest growing industry. It’s the opportunity of a life time. motor” ino radis interierange), Stee ie eample rail, If you are mechanical- Train now, in your spare lime, for a wheels, bronze bearings. Solid T ralis, ees tie and spikes— ly ‘inclined, mail the 004 Job and good pay. under supervi- real spikes and wood ties, Runs 120’ FREE y , slon of big engineers right in the big (ralniatare) m, p. h., smoothly, quietly. dod poupon at once. gyer Factories. Training endorsed by lead- write— ; men owe their ng WESTERN COIL & ELEC. CO. Dept. MM. Racine, Wis. : ing Refrigeration and Air Condltioni success to my method, firms. Mail coupon now for list of op=+ and I offer you NOW portunities, details of training, employ- i ieve- ment service, earn as you learn plan, the crowning. achieve- and professional testing equipment fur- vat y YEATS nished without extra cost, Do it NOW: training men for better Get started on the road to good poy in in only 8 weeks at largest schools of kind in world. New Address school nearest you. (6010) FOR FREE BOO For Trained Auto Mechanics jobs. Write me at America’s newest industry. practical shop plan. Learn with real tools... on real equipment. Write today for Big Free Oppor- MoSWEENY SCHOOLS, Dept. 11-13 Book Ra i y D. Smith, President, Mĉisveiana, O. or Kansas City, Mo. Refrigeration and Alr Conditioning Institute, Step into Big Pay. Earn $35 to $75 a week, I train you once. tunity Book and Speclal Low Tuition Offer. FREg 2140 Lawrence Ave., Dept. 3I a! HAENEL Chicago, II. aé ” Send me your free book about the opportunities In Refrigeration 100 SHOT and Air Conditloning, details of your training and offer. REPEATER Latest Model 1935 Haenel repeating m pistol. Sturdy, massive construction, tA NOM: yerri iirin kn seni as ga eonA Newland an cimmune ot ot ew Eisen: easy cocking lever, 100 shot magazine. For target. Powerful for small game. ği Blue or Nickel finish. Shoots B.B. steel shot. Wt. 18 E 0z.F REE—500 Shois. $2.00 deposit on C. 0. D. rT.) SAUGTOSS: saciid donani Radwell EE Medel oo HERE oe ee Gate hE as, FREE Catalog—Colts, Rifles, Binoculars, ete. oi \ Thank You for Mentioning Modern Mechanix and Inventions for January When Writing to Advertisers 21 Hudson Sporting Goods, M-52 Warren St., New York

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CRAFTY CRAFTSMEN use LE PAGE’S 3 Kinds ' Built for Strength LE PAGE'S LIQUID GLUE—The “all-purpose” glue, put up in handy cans that are part of the equipment in every woodworking shop. Its slow setting qualities allow time to make joints secure and exact. Ready to use— always, LE PAGE’S WATERPROOF GLUE—A special glue for use on jobs exposed to the elements or moisture. While it isn’t ready to use, it takes but a few minutes to add cold water and mix. Put up in several sizes—you may want to use it any time. LE PAGE’S TESTED GLUE — This is termed a hard glue, in flakë form, tested and stand- ardized for strength. Where glue is to be used in large quantities you may prefer to use it. If you insist on using the glue pot, ask your dealer for LePage’s No. 60 in one- pound packages. |EPAGE's RUSSIA CEMENT COMPANY Laboratories and Factory œ Gloucester, Mass. FOLLOW THIS MAN PoR pan No, e.g te 12) 4 Orong uni . a 4| tale Soger prints In murdered gils room. E ‘The Confidential Report ree Onerator No. 38 mago to his chief. Write for it. Earn a Regular Monthly Salary YOU can become a Finger Print Expert st home, n your spare time, at small cost. Write for con- dential fall report and details. Literature wil) NOT ba sent to boys under 17 years of age. INSTITUTE GT APPLIED SCIENCE inyside Ava. 4| Dept. 23-51 Chicago, Ill, Make Your Own rs PORTABLE peel Phonograph at home. Anybody can build thls marvelous hi) clear toned PORTABLE Phonola Special for H about 14 price by using the Phonola Kit. Plays 10 or 12 inch records. We furnish all parts with complete instructions for build- ing with simple tools found in any home. Parts include genuine Master Junior motor, Master reproducer, tapered tone arm, 3-ply veneer case ready to finish, etc. These are the same standard parts used in making our world famous phonographs. Have fun building it then take it on hikes, picnics, to parties, etc. Com- plete description of all purts and fin- ished instrument sent FREE. Write quick—The Conley Company, inc., Dept. 68, Rochester, Minnesota, Chips Froin the Editor’s Workbench (Continued from page 20) and about 40 m.p.h. on hard snow. Power is furnished by a Harley Davidson 61 motor that turns a home-made prop of 41⁄2 feet diameter and 3'%-foot pitch 3150 r.p.m. The body is built of spruce and plywood covered with air- plane fabric and doped. All inquiries will be answered, John Ceraska. Gordon Lyons built the hydroglider shown in the photo, but was disappointed with its speed. He says: i St. Gabriel, Que. Dear Editor: The hydroglider is powered with a twin cylinder motorcycle engine. This boat is only capable of 15 miles per hour. I would like to know the reasons for such slow speed. : Gordon Lyons.. We believe that Lyons is getting good speed with his motor. To increase the speed he will need a more powerful motor. l * * * Diving helmets are as popular and success- ful as ever. Dick ees Day, of Vancou- ee 7 ver, B. C., Harry Throsel, Wauke- gan, Ill, and Ed Viner, Little Falls, Minn., each have built one and are having great fun exploring under- water in the lakes and rivers near their homes. They sent us photos and letters, but we have room only for Day’s this month. Vancouver, B. C. Dear Editor: I am sending a picture of a diving helmet which I made out of a hot water boiler, I cut the top off the boiler with a cold chisel. I then had semi- circles cut out on each side with an acetylene torch so that the helmet would rest on my shoulders. j I cut the window out and covered it with celluloid, using nuts and bolts to clamp the gas- ket and the celluloid to the helmet. Cans were riveted to both sides of the helmet, each be- ing made to hold a fifteen pound weight to car- ry the “diver” to the bottom. There is a small hole at the bottom of the helmet: to let the bad air out. ` I installed a telephone in the helmet using a pair of earphones and the talking piece of a telephone. Above water I have a small school telephone, the current used being supplied by two 1¥%-volt dry cells. The wires from the phones are carried up through the air line. I have gone down successfully 30 feet and am planning to go down after a sunken speed boat. Dick Day. (Continued on page 24) Here’s Dick Day and his tele- phone-equipped diving helmet. 22 Thank You for Mentioning Modern Mechanix and Inventions for January When Writing co Advertisers

Page 23

LOW PRICED C-D MODELS The Howard Ike shown at right to %4’’ scale (10%’" span) Dwarf-42* postfree only 350 To %’" scale (155%’" span) entirely com- plete kit SF-42, postfree...........- 98e Navy Boeing F4B-8 Fighter shown below à to Y2” scale (15° span) Dwarf-29* post- free only 75c. To %7 scale (22327 span) entirely complete kit SF- 29 postfree $2.85. SEE YOUR DEALER for complete line of famous C-D Models or send 5¢ immedlately for catalog describing complete line of 32°’ scale Dwarf* models 25c to 85c plus 10c postage and y scale models entirely complete 98c to $8.50 (653 now ready). Every model absolutely authentic, with printed-wood. Also complete line of quality supplles. *Dwarf models complete except without cements and dopes. CLEVELAND MODEL & SUPPLY CO., Inc. 1866M-A, West 57th St. Cleveland, Ohio MADE. EASY. ; NEW, ORIGINAL, COMPLETE COURSE especially prepared by one of today’s cleveres' newspaper and magazine Cartoonists. I! of panch and inter- est, 30 fascinating lessons; hundreds of Stepb = ep Cartoons. EX- TREMELY Eas « Learn quickly from the start, either for fun and spare money or to become a professional Cartoonist! Money back guarantee. Or. send for Free detalis. Don't delay. THE AMERICAN SCHOOL OF CARTOONIN: Dept. 31 614 West Austin Ave. Chicago, MI. power = PRECISION MICROSCOPE - Only $375 Reveals the wonders of the Invisible world magnifying the object 250,000 areas. Features: Double rack and pinlon focusing; adjustable stand which tilts at any angle; large platform; removable slide clips; lever which holds microscope In any positlon; excellent optical system of ERECISION quality. Fine, staunch, durable, construc- tion. Complete with necessary equipment as prepared, plain slides, dissecting needle, etc. Send $3.75 plus 25c for postage to PRECISION OPTICAL CO. Dept. ‘‘M,”* 991 East 163rd Street BEA RADIO OPERATOR No experience needed. Begin- ners read code quickly, copy ac- curately. Ifan op. speed up your wpm. with approved, amazlng mas- New York in past few years than all others com- F bined. Used by U. S. Army and Navy, R.C. A., A.T.&T. Complete course, lend you instrument. MONEY BACK GUARANTEE, Bouklet M.M. I, TELEPLEX CO. 76 Cortlandt St., Now York, N. Y. INVENTORS A patent is a Deed to intellectual property. Property has a value. To obtain patents, trade marks, Write to 18 East sist St. | ASSOCIATED SERVICE New York city Our 50 years’ practice is your guarantee We perform as we promise HAWAIIAN GUITAR the Hawailan way. Surprise and entertain your friends. Amazing new simple method makes 4) learning to play from REGULAR PIANO MU- SIC as fascinating as a game. Shows you in pictures how to do It. Previous musical training and talent unnecessary. Earn while learning by new plan. You pay for the lessons just as they are received. Write today for free Information. A post- 25c card will do. (Fine guitars supplied $5 up.) PER ACADEMY OF HAWAIIAN Music ESGON Eth Floor Lyon & Healy Bidg., Dept. 37B, Chicago LEARN TO PLAY THE No talent or experience necessary. Fascinating work. Pays big money. Complete instruction book tells about: Alphabets,Colors, How to Miz Paints, Show Cards, Window Board and Wall Signs, Ready made letters, Gilding. Tricks of, the Trade, also gives 100 Alphabets and De- signs. Book bound in flexible imt. leather- / gold edges, and four hall bearing Show Card ¢ Pens. Sent postpaid $3.00..C.0.D.) licex. & a ay Ogilvie Pub. Co.,57 Rose St, Dept.3 H.Y, City y W EARN MONEY /MMEDIATELY = __WE FURNISH EQUIPMENT. TO START // _ ter Teleplex. Has taught code to more : If it does, do some- thing about it! Get a raise in salary—but first get the training that will entitle you to this raise. Thousand; of men in the same fix as you have gotten this training by spare-time study of an I.C.S. Course. Mail the coupon teday! NTERNATIONAL CORRESPONDENCE SCHOOLS - “The Universal University” Box 2322, Scranton, Penna. i 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 ` O Architectural Draftsman O Building Estimating O Wood Millworking O Contractor and Builder O Structural Draftsman D Structural Engineer O Electrical Engineer O Electric Lighting g Welding, Electric and Gaa [m O Automobile Mechanic O Plumbing O Heating D Air Conditioning O Sheet Metal Worker O Steam Engineer D Steam Electric Engineer O Civil Engineer O Surveying and Mapping O Refrigeration O R. R. Locomotives OR. R. Section Foreman R. R. Bridge and Building Foreman R. R. Signalman [O Air Brakes Highway Engineering O Chemistry D Pharmacy O Coal Mining Engineer ù ` O Navigation O Boilermaker O Textile Overseer or Supt. O Heat Treatment of Metals D Cotton Manufacturing O Bridge Engineer O Woolen Manufacturing O Bridge and Building Foreman O Agriculture O Fruit Growing O Gas EnginesO Diesel Engines Q Poultry Farming O Radio O Aviation Engines O Marine Engineer BUSINESS TRAINING COURSES O Business Management O Business Correspondence O Industrial Management O Lettering Show Cards D Signs O Traffic Management O Stenography and Typing D Spanish Reading Shop Blueprints Telegraph Engineer a O Telephone Work a O Mechanical Engineer oO D Mechanical Draftsman O Machinist O Toolmaker O Inventing and Patenting O Patternmaker O Accountancy and O Civil Service C French 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 D Salesmanship O Advertising [ Illustrating NAD EAA A E A Lebeau naueanereeariag r:e ecceercees ALCON OSS PANE O E E E A E DUF onien A Aae T A E Dopu aN oai eiee na E A OEE Thank You for Mentioning Modern Mechanix and Inventions for January When Writing to Advertisers 23

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PLEASURE or PROFIT. A fascinating hobby or nd Zrostable business can now be yours. Prepare ly at home under the person: guidance of les experts In the fin of photography No e No experience cn necessary. tS or spare Our th studio method al Rigo qu allies y ou oa to Bil e well Dui pig position upan graduation. gorpon oor for aktet, Opportunities -pa "Moderne hotography. 8 esas er aaae E E i e R E E iea a AMERICAN SCHOOL OF PHOTOGRAPHY, 3601 Michigan Avenue Dept. 2081 : Chicago, I. lot, Opportunities in Modern Photagraphy, and full information, CHEAP OIL BURNER Invented COONS A MEAL FOR a6 quick for money making offer Slps into Any Old Stove, Range or Furnace; Beats Coal or Wood; No Dirt or Ashes; HALF THE COST. United Factories, 184° Exchange Blag., Kansas City, Mo., have brought out an amazing oil burner which experts and 15,000 users say beats any ever gotten out. Burns cheap oil a new way, without generating or clogging up; glves intense heat at HALF COST by turn of valve. One free to one person in each locality Sia will demonstrale and act as agent. Write quick, be first to learn how to end drudgery of coal and wood and make big money, spare or full time—mail le postcard today. Save Money! Buy direct from the largest company of its kind in the world... at lowest WHOLESALE Prices! Kits, parts, tubes, short wave and all wave sets from 2-12 tubes. Over 50,000 items! Hundreds of .bargains on ‘Nationally known lines. For ‘your KEE o copy cut out and man this ad to: LESALE: RADIO SERVICE CO. 100 Sixth Ave.; Dept. M-15, New York, N. Y. METAL-WORKING LATHE Preclslon equipment for the small shep. New designs and manufac- pre ae Processes make thie amazing bargain possible. to metal. -working lathe Ta h compound el elide-rest. 3-jaw chucking d 6" 20 lbs. Send $1.00. Balance co plua potasa] ©. D. page ines trated instruction ach order, Catalog free complete line, fer beeed power tools. Attachments for milling, grind ing, , Banding, saw tabis etc., available at low prices, Order from ad at once and have a complete machine ebop, AMERICAN MACHINE & Foor co. Dept. x 200 Broadway, New York in ENGINEERING Ne. ‘j pain Special Section for. mid-winter High School Grad- uates starts Feb, 4, 1935, Full freshman year in 6 months. Enter in the Fall of 1935 as sophomore. T. offers fully accredited degrees in all branches of Engineering. Com- plete, modern equipment. All college activities. Low tui- tion. Write Registrar today for catalog and full information, Ena Lawrenca tnstilute of Technology, 15108 Woodward, Dotrelt, Mich, pai is ca aa Hat ahh ge ic a a TP a si 95 5 Now buys a genuine MEAD Bicycle RANGERS cost a st a few dollars more. Do not buy until you get our astonishing new prices and terms. 30 Days? Trial “e:i gnep: | satisfied after trial return the bicycle at our expense, Tires lampe, Feels, equipment at h et halt s asua) zleen.. Mea CYCLE COMPANY ie Y today for DEPT. B289, CHICAGO troo cataro Chips From Editor’s Workbench (Continued from page 22) This i is Walt Schaefer and his latest glider. It has a 36-foot wing span, weighs 285 Ibs., and cost him $60 to build. Here’s luck, Dick, on. that speedboat hunt. Throsel tells us he built his helmet for less than two dollars. Ed Viner also has a tele- phone installed in his underwater outfit and is planning to put a searchlight on it. He wears a belt loaded with 25 pounds of lead to hold him down. Plans for a good diving helmet can be obtained from MM for 75 cents. * * H The newest club to receive a charter in the International Society of Modern Mechanix and Inventors is the Y’s Craftsmen located in the capital of the United States, Washington, he club members are interested in Jeathercraft, cabinet making, and inlay work. John W. Sumner is president and Mrs. Mar- guerite Bone is secretary. We welcome Mrs. Bone as the first woman to be an official mem- ber of the Society. * x + Here’s a light plane fan who wants to hear from his brothers of the air: ' 308 Locust Street Clearfield, Pa. Dear Editor: Hello fellows, it’s me (I) again crashing the column this time with my newest secondary glider. It’s a pip and I wish you could see her fly. It has a wing span of 36 feet, 5 foot chord, and 80 inch landing gear. She weighs 285 pounds loaded. I built it in four month at a cost of about $60. I flew it, and am fying it with the be:t of luck, never a crack up. She takes off at 15 m.p.h. with a car towing and climbs fast. Let me hear from all you glider and light plane fans that the government didn’t get and let me know what you’re doing. We’ll swap yarns. Walter Schaefer. * * * E. G. Stafford, of 65 A Durrington Road, Clapton, E 5, London, England, would also like to correspond. with MM readers. He is 30 years old and is interested in anything mechanieal, sports, psychology, general man- agement and chemistry. He would especial- ly like to hear from members of the Interna- tional Society of Modern Mechanix: and Inventors. (Continued on page 26) Thank You for Mentioning Modern Mechanix and J nuentions for January When Writing to Advertisers

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Get lt Now! The 1935 Edition of the HANDY MAN'S HOME MANUAL How To Fix... + Leaky Faucets Balky Furnaces Broken Windows Ailing Radios and 1000 other items for the Home How To Build... . Furniture . Toys . Games . lce- less Refrigerators . . Swimming Pools and Automobile Trailers Buy Now 007 At All Newsstands If your dealer cannot supply you write to MODERN MECHANIX PUBLISHING COMPANY 529 So. 7th Street Minneapolis, Minn. Start $1260 to$2100aYear PICK YOUR JOB MEN, BOYS—18 to 50 Travel—See Your Country Railway Postal Clerks get $1,900 the first year regu- lar, being paid on the first and fifteenth of each month, ($79.17 each pay day.) Their pay is quickly increased, the maximum being $2,700 a year. ($112.50 each pay day.) Railway Postal Clerks 3 Days On—3 Daye Off—Full Pay : Railway Postal Clerks on long runs usually work 3 days and have 8 days off duty or in the same pro- portion: During this off duty their pay continues ust as though they were working. They travel on a pass when on business. When they grow old, they are retired with a pension. i City Mall Carriers, Post Office Clerks Clerks and Carriers now commence at $1,700 a year. and automatically increase $100 a year to $2,100 and $2,300. Customs and Immigrant _ Inspector _ Salary $2,100 to $3,300. Men 21 to 45. Work connected with examining immigrants and merchandise entering the coun- try from foreign parts. Winter examinations expected Many winter examinations are expected and those wishing positions should qualify at once. Get Free List of Positions Fill out the following coupon. Tear it off and mail it today—now, at once, This investment may result in your getting a life big-paid gov- ernment job. FRANKLIN INSTITUTE, Dept. K-291, Rochester, N. Y. Rush to me entirely free of charge (1) a full description of ‘the position checked below; (2) Iree 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. a O Railway Postal Clerk O Post Office Clerk ... O City Mail Carrier .. O Government Cterk—Flile Clerk. O Inspector of Customs.......... seve 3 O Immigrant tnspector ........ MEAE A EEEE N (Start 2100 year) .. (Start $1900 year) (Start 1700 year) Use This Coupon Before You Mislay It Thank You for Mentioning Modern Mechanix and I nventions for January When Writing to Advertisers 25

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SPECTROSCOPE Reveals the secrets of both suns and atoms! Shows the countless spectral lines of the sun and hundreds of brilliant rainbow colored lines of gases and metals. Most amazing instrument analyzes chemicals and ores by their character- istically arranged and beautifully colored spectra. Months of fascinating experiment. New inven- tion makes possible all these achievements at one- tenth the usual cost. Spectroscope complete, $2.50 ELECTRIC FUN Do tricks with electricity, Make things spin, . jump, kick, vibrate, buzz, shoot, shock, flash mystify—all by electricity, Make ’ window novel- ties, floating rings, electric lights that obey the voice, spirit rapping, all kinds of amusing and practical devices. Book telling how to do 200 stunts with 110 volts A.C. Price postpaid. ...$1 STROBOSCOPE Stroboscope complete with variable speed 110-volt elec- tric motor, neon lamp and book of 100 experiments to be performed with the outfit, telling how to produce strange and beautiful stroboscopic phenomena, motion picture effects, color harmony and many practical appli- Complete outfit, postpaid.. $I cations. With an order for all Combination Offers tires “or "the ‘above items, a copy of Chemical Fun (100 experiments) will be included free. PATENT BLANKS Inventors! Get your own patents; pay government fees only. Legal blanks and book of complete instructions .... t Cutting & Sons, 15 D St., Campbell, Calit. MAKE TOYS & NOVELTIES AS OUR MANUFACTURER Earn money casting our NEW LINE of hol- low Soldiers, 5 and 10c Automobiles, Ash- traya, ete. No special place or experience 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 bust-` ness and are over 21, write at once for de- tails as CHRISTMAS RUSH is now start- ing. ETAL casT "PRODUCTS co. M woe t. 2 1696 Boston Road ork, N. Y. mushrooms. PAND—All all, Y nd producti ASSURED a REET P Fascina PROFITABLE ear arou! uction. H full time, or Pastime occupation, Splendid HOME buat, enterprise, Detaile free, Write today. interstate Mushroom industries, PF-7357, Cottage Grove, Chicago MAKE $50 TO $100 A WEEK! Many of our successful students are now making big - money. Our simple methods make it easy to learn Commercial ning and Designing at home, | p spare time. Now low nition fates Yei big tree bos ‘ART for Pleasure and Prot STUDIO 201, WASHINGTON” SCHOOL OF ART “- 11t5=15TH_ST.., WASHINGTON, D. C. AT LAST! A REAL POCKET RADIO Can actually be carried in pocket or purse! Notubea —batteries—nothing to wear out. Simply clip to HANY G made ‘of metal for clear toned reception] $ Ono contro!—gots all stations 50 to 100 miles, Short wave & police calls also) No aerial or complicated wires needed! Proven coast to coast reception in tests | 4 Foolproof—and practical—great novelty. Can be NYWHDRE while walking, riding, etc.! Complete with tiny phone. Nothing else to buy. Send only $1.00 and pay Postman $1. 05 plus pi postage or send $2.99 (M.0., ). Currency, Ch Check). deal gift for any boy. on Aneuded: Gnaran’ Order TINY TONE RADIO oto. Dept. M ol esrney, N Nebr. Chips From the Editor’s Workbench (Continued from page 24) George Raymond makes a business of building novelty: wind- mills such as these in his shop, the Cape Cod Windmills.” George Reverend: of Kingston, Mass., has developed a thriving business building un- usual windmill novelties in his workshop. His shop is known as the “Cape Cod Wind- mills.” A group photo showing some of his original designs appears above. What do you. like heal about MM? Wed like to know. This is what appeals to Henry Cook of Scapa, Alberta: “I like to make things, most anything that - is useful, and your magazine has more practi- l cal. stuff in it than the others. Other magazines seem to take it for granted that their readers are fully equipped with a machine shop com- plete with lathe, etc. Suffice to say that as long as your magazine continues on the practical side I’m for it.” * * * The Workbench got a bit more space this. month. We hope we can keep it up. Let’s see your pictures and letters for our contests.. By the way, what light plane fan will send us the first photo showing himself in the air in his ship? You know what we mean—one of those closeups made with an automatic shut- ter arrangement on the camera. That’s all until next month. NOVEMBER PROBLEMS CONTEST WINNERS N THE November Problems Contest, the total area over which the horse could graze amounted to 30,294.2 square feet. Many. carried this solution out to a dozen decimal places despite the fact that they had used only four or five decimal places in previous calcu- lations, Quotient and remainder for the cryp- tic division are 120996 and 384 respectively. In the monkey problem, 15 was the least num- ber of nuts that could be gathered, with one nee pelung eight, the other 4, and the mon- ey 3. First prize of $10 goes to J. L: Mims, Mary- ville, Tennessee; 2nd prize of $5 to Christy A. Wiken, Rockford, Illinois; and four third prizes of $2.50 each to Robert Fong, San Fran- cisco, California, Raymond Mathewson, New Britain, Connecticut, Edward D. Howell, Detroit, Michigan, and Wm. Zimmelman, Detroit, Michigan. The announcement of this month’s prize - contest appears on page 44. 26 Thank You for Mentioning-Modern Mechanix and Inventions for January When Writing to Advertisers

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NOW is the Time to Get Ready for the BIG PAY JOBS gs AVIATION, « | Government spending millions of dollars promoting commercial avia- tion. This means there will be thousands of new ` jobs. Now is the time for you to start training for a good paying jcb in aviation. í or success. Govern- LINCOLN Prepares You Pre noose Stent. Only modern high class training planes with Dept. of Commerce approval are used. Training given for govern- ment license as Transport, Limited Commerclal, Private or Amateur: Pilot. Ground and mechanics school with ex- perienced instructors quallfy you as Master Alrplane and Engine Mechanic. Airline pilots earn up to $500 a month; Airplane and Engine Mechanics also earn good pay. 24 years successful experience as mechanics trade school and - 14 years teaching aviation. Write now. Please state age. LINCOLN AIRPLANE & FLYING SCHOOL 403D Aircraft Bldg. ncoln, Nebr. ee] MAKE MONEY PRINTING letter and billheads,. circulars, cards, spare time. Easy to learn. Printing Presses, $12; new type, complete sup- lies, low prices. Send stamp for catalog. PEIFFER CO., 23-A 6 Columbia St., Newark, N. J. E E I Bir Ties HIGH POWERED TELESCOPE GENUINE BROWNSCOPES AT AMAZING PRICES Most Powerful h, America for the money! 16 Power long range teleacope, Can see moon’s craters or time on pocket watch a bioch away. 5 sections. Approx. 3 ft. long. Finelensea. Brase bound, Can be used as powerful microscope vol: magn. 612K. Only $1.69 poet- a C. O. D. 24c extra. Taa À Special ~ Super $4.69 =a ae, ap Power 30x Telescope pes mi e bat more powerful. oe Guaranteed to ses "900 times larger an. eur- face and 30 times closer, J1 mm. objective 4 powerful maes. Large feld: Includes powerful microacope feature. ler Only $1.98 poetpald. BROWNSCOPE Co. Dept. 57 234 Fifth Ave., N. Y. YOU HAVE THE JOB! THE NEW AUTOMATIC HEAT With your old Coal Stove or Steam Boiler. Every handy man can build for small money, by following a simple direc- tion, for yourself or contracting. MAKE BIG MONEY CONTRACTING WITH MY INVENTION “NO More Cold Rooms in The Morning.” By setting this invention, you’ can have heat at any hour of the morning, without any extra cost, Plan and Blueprint $1.00 (money order). INVENTION-SALES & BUILDING CO. Box 270 Brentwood, L N. Y. MAKE MONEY AT HOME Home Industries Bi-Monthly will show you how. Describes all kinds of profit- able, legitimate plans, schemes, formulas, ideas, etc. 32 or more pages. 6x9 inches. Six months’ trial subscription 10c. HOME INDUSTRIES Box 89 irvington, Nebr. CHEMISTS Catalog listing 10,000 chemicals, drugs, flavors, etc., and 1,700 scientific books, sent for 25c. Cata- log with 3,000 illustrations of labora- tory apparatus, 50c. Glass Still as illustrated, capacity 1 quart, $9.00. LABORATORY MATERIALS CO. 642 East 71st Street Chicago, IIl, ANDLE REGULAR ROUTE placing world’s greatest line of Counter Card Merchandise with stores, Aspirin, Razor Blades, Dime-Lax, Bromo-Fizz, Confections. 1C0 fast selling displaya. Over 100 per cent profit for you and merchants, Steady repeat orders. No experience or investment needed to start. Big catalog FREE. WORLD’S PRODUCTS Co. Dept. 1814 Spencer, Ind. Thank You for Mentioning Modern Mechanix and Inventions Jor January When Writing to Advertisers NOW FIX ANY MAKE UF ao SIX BIG AUTO BOOKS ALL ee on approval; whether you want to qualify as garage owner, auto re- pair expert or merely wish lo know how to keep your own car 100% efficient, look at these boolke—they. are sent to you for free examina- tion. This brand new edition has been prepared by a large group of America’s greatest automotive engi- neers. Anybody who can read will understand them, for this great Buto- mobile encyclopedia is a veritable gold Take advantage of this offer now; send in the You don’t pay us a penny, you don’t: mine of valuable facts. Coupon for FREE examination. obligate yourself to pay anything unless you decide to keep the books. Just tell us you want to see them and the full set of 6 great vol- umes, just off the press, will be Aviation Motors Knee Action Wheels Rear Engine Cars sent to you! Read them, look Outboard Motors them over and prove to your own satisfaction that one fact alone, which you will find in them, may save you an expensive repalr, or help you to a better job. Very Latest Edition Imaglne‘books which are so new that every page is right up to date— wiring diagrams, construction details, service problems—are all right. up to the minute. Nowhere else can you get as complete and up-to-date information. Over a million dollars of resources have enabled us te give you the most authoritative books on the subject ever published. Everybody interested in automobiles in any way will welcome these u Octane Selectors Tractors Are Fully Covered too Srp rant | books published by the world’s largest publishers of Technical Cyclo- | pedias (est. 1897) with agencles all over the world. Can You Fix It? Can you take out “‘play’’ in differ- ential? Can you kill the “shimmy” In sleering? Can you reset TIM: ING? Can you put your finger on engine trouble without guessing or tinkering? Can you puli the starter off and fix it? Can you adjust and repair transmission, engine, rear axle, bearings? These Books Tell How and tell you how to do any and every auto job right, the first time. 6 Big Volumes Nearly 3,000 pages, over 2,000 illustrations, wiring dlagrams, equip- ment charts, etc. De Luxe edition with gold-stamped flexible binding. Sent FREE for 10 days’ use. If not wanted return express collect. If kept, send only $2.00 after 10 days, them $3.00 a month until special advertising price, $24.90, is pald. A Year's Consulting Membership FREE! _ Privilege of consulting engineers of million-dollar American Techni cal Society on any automotive problem for one year without charge. If you mail coupon immediately we will include, free, extra volume 7 wilh complete information on latest cars, knee action wheels, ete SEND NO MON N American Technical Soctety, Dept. A1320 e B Drexel Ave. at 58th St., Chicago, IHinols. E I would like to see the brand new 6-volume edition of your automo- i bile books but without any obligation io buy. FI will pay the few cents delivery charges only and will examine the books andreturn | i] them at your expense in 10 days unless I like them, in which case I will send you $2.00 then and only $3.00 per month until ] the special price of only $24.80 is paid. You are to include free, consulting membership certificate in the American Technical M E Society. Send latest edition and also include volume 7 Free. a a a T i i L] Eey Een et Aewbires Pererika Statis puak a Employer’s Name.............-. ois Eaa EE Geis ETE Employer’s Address..............:0seeaes PTE TETEE TT | Please give us, in addition, the name and address of one business man as reference. - Leansanm ae eee eee el 27

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N HOUR PAYS YOU ¥8 $2.00 : SAV-AN - UPPER — Sensational new discovery—completely covers scuffed, discolored and faded uppers of any shoes with wear-proof, hlgh- ly polished coating. Makes them look new. Quick, easy, economical. Takes only 4 minute. Guaranteed. JUST BRUSH IT ON ] Absolutely new and dif- = ferent, oe: ood- looking, long-wearing, crack-proo! nis! oO d a and leather articles. FREE SAM- g .PLE—Men and women representatives making tremendous profits. Unlimit- ed demand. Write today for free sample that proves all claims, and territory offer. Send no money. SAV- AN-UPPER CO. Dept. E-223 Cincinnati, Ohio S7 Than Other Fuels Send name for free book on LACO’S seneeational new ‘*Mineral-Wick’’auto- matie oil burner. World's lowest priced! ves 2b per cent of fuel costs. Gives hotter flame with less oil. Goodrich (Me. saya, ones mo $50 over coal 1 winter,’’ Clean, noise- beeen mo 16,000 in uve. WRITE! Get low price, dus to simpler design, i Look Here, : DEALERS I Lower price and fuel savy- ings help my dealers out- sell others. T’IL ship you sample burner, on approv- al, subject to examina- double e pafety features. * jow factory-costs, Get No-Risk, Trial- Ofer and Free Book. SEND NOWI auick Toa p my piane v Wata Laco Oll Burner Co.,215 Union Avo., Griswold, la, COCKLIN, Pres. For 30 Days ALE No Money Down—Actual Crime Cases— If You Act Quickl—We gil send you this stirring book on Crime Detection, Se; aret Service and Iden- tification KELE: for side 30 day ra free Pare ing. end na mone’ fou decide it ee] en, AY on! $1000) If not, return it, WRITE TODAY. Nok gent to boys under aT years of pax 23-51, 1920 Sunuysids Ave.. Chicaza S-P-E-E-D! AUTO RACING BOOK Whole book brand new. Working draw- ings, pictures and full description of fast stock and race car chassis and g bodies. Get dope on 100 m.p.h. stock V-8 Fords, 110 m.p.h. midgets, 120 m.p.h. Ford A and B conver- sions; 125 m.p.h. modified stock and 135 m.p.h. stock conversion speedway race cars. Order Today, Postpaid $1.00. C.O.D. $1.12. RAY F. KUNS Dept A-4 Madisonville, Cincinnati, 0. $500 CASH PRIZES — SEE PAGE 44 Make & Weekl Cc LETI) A AND 10 STAR “SPECIALS?” R.C.A. Licensed Home Radio Sets for American, European and South American Reception and our 10 STAR items including Chest of Silver, Man’s Wrist Watch, Electric China Coffee Set, Bridge Table and Chairs, Lady’s Wrist Watch and other valuable gifts all given away absolutely FREE with our new sensational unique PUNCH SALES CARD PLAN. This ia the opportunity of the year— mako sR to $150 cash each week for yourself. Every home, car owner, store, om eer ectory, lode lodge, club ot _ individual wants these marvelous new FREE SED RADIOS or any of the valuable 10 STAR items. WRITE TODAY FOR OUR 3 NEW STARTING OFFERS Start at once making money with our unique sales plan. Write for full inror- mation how yon can secure any or all of these plans. DELUXE MFG. CO., Dept. 139, 173 W. Madison St., Chicago, HL. 28 WONDERFUL NEW INVENTIO 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 torche Burns an hour at less than ¥ cent for gasoline, AGENTS’ OFFER Write forSpecial Offertoagents., The Justrite is an ideal proposi- tion for either main line or side line — full time or spare time. SUSTRITE MFG. CO., 2047 Southport Avenue, Chicago, lil. NEED MONEY? Write for free booklet describing ‘87 Plans for ¥ Operating a Successful Business of Your Own”. y Make from $20 to $100 a week starting in spare § time at home. No peddling or house-to-house selling. J Booklet sent free, and without obligation. Write for your copy today. ELITE PUBLISHING CO. 214 Grand St. New York, N. Y. Dept. G c RTOJN YOUR WAY 7 SUCCESS! N al hax COPY - LEARN TO ORIGINATE! RAYE BURNS will teach you HOW to CREATE ORIGINAL CARTOONS at home that you can 85 SELL! Course has 26 lessons and 600 illustrations, Send name and address for free details. Only... RAVE BURNS SCHOOL, Dept. F-X Box trie CLEVELAND, OHIO e | and Make up to $12 ina Day! Let me send you this fine all-wool tailored suit FREE OF COST. Just follow my easy plan and show the sult to your friends. Make up to $12 in a day easily. No experience—no canvassing necessary. Send for Samples—FREE OF C: Write today for FREE details, ACTUAL SAMPLES and poueire” money getting plans. Send no money. P Collin, Progr: Tailorin, ept. N-137 s00 $: Tiroa St Ceres? Tailoring Co., Dept. N83 70, p, AVIATION APPRENTICESHIPS AIR-MINDED Young Men interested in entering the field of Aviation as Apprentices. Write, enclosing stamp, to— MECHANIX-UNIVERSAL AVIATION SERVICE 13291 Ardmore Dept. A Detroit, Mich. AUTOMOBILE COMPASS Have you ever taken the wrong road and traveled many miles befure discovering your mistake? ‘hls new AINPLANE TYPE COMPASS constantly tells your direction of travel. Sticks to windshleld. Base 1%% diameter, ONLY $1.95, POSTPAID, includ- ing Compensator. SATISFACTION GUAR- ANTEED or your money refunded if returned within ten days. Agents Wanted! CO. Box 246-A1, WARREN, OHIO FREE Write for illustrated booklet describing money making opportunities in PHOTOGRA- PHY. Pleasant and profitable occupation. Steady employment, permanent independ- J ence. Famous N.Y.I. personal attendance or Home Study courses will enable you lo earn i good - income as professional photographer— Commercial, -News, Portrait, or Motion Picture Photography. NEW YORK INSTITUTE OF PHOTOGRAPHY Founded 1910 . 10 West 33 St. (Dept. 153) New York City f S ie How To. j SUCCEED H Thenk You for Mentioning Modern Mechanix and Inventions for January When Writing to Advertisers

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Become a Radio Expert GOOD JOBS learn RADIOTELEVIS Electricity—Talking Pletures—in Los Angeles A good job awaits you if you train immediately. Enrol} with National. 30,000 graduates. Qualify as a radio repair man; television expert; sound expert; broadcaster; station technician ; electrician and for many other jobs. Earn room and board while learning. We help you get job, For limited time we will allow coach railroad fare to Los Angeles, Send for free book which gives full details about different jobs you can qualify for, complete course of instruction and photographs of school operation. Sign and mail, coupon | IATIONAL RADIO & ELECTRICAL SCHOOL Dept. 1-MMR, 4006 So. Figueroa St., Los Angeles, Calif. Please send me your blg Free Book on Television, Talking Pictures, Radio and Electricity. Also details of R, R, fare offer, Neme ‘New occupation. Pays big money at once without ` investment. Introduce sensational new Hne Se and 10c necessities to stores. Self sellers. Permanent repent business easy. ‘Expertence unnecessary. Start free. Write PRO-CO-PAX Dent. 37-ED 1956 S. Troy CHICAGO SAMEN — WOMEN DON'T WORRY ABOUT A JOB / Your own cleaning and pressing business! AMAZING OPPORTUNITIES! We furnish complete equipment, and traln you athome by easy practical methods. EARN WHILE LEARNING. No experience necessary, Earnings right from the start. Steady repeat huaineaa, Not affected by depressions. No capital needed. SPECIAL E OUTFIT OFFER to those writing ‘or information at once. BUSINESS OWNERSHIP INSTITUTES 2400 W. Madison Dept. A-52 Chicago, Wlinols wooD Post Less cutters. -ef (C.0.D. or out- eos SHAPER y} paid Surs. Sa 2) Uses standard 5/16’ cutters. Table is heavy gauge pressed steel, 8’’x5%’': stands 5%” high. Base, table support and spindle adjusting slide, heavy gray iron castings. Ollless bearings. Order now or send 3e stamp for NEW 1935 24- page Catalog fully describing all our equally low Eg power toola and accessories, including Jig Saw, rill Press, Sander, Line Shaft, Lathes, etc., etc. 4. & H. METAL PRODUCTS CO. 400 St. Poul St., Rochester, N. Y. How To Burrp BOATS, AUTO RACERS, RADIOS, MODELS 1934 How-to-Build-It — Send 50c to Modern Mechanix Publishing Co. 529 S. Seventh St., Minneapolis, Minn, Raise mushrooms in your basement, cellar, garage, idle places, Large com- panies require tons of mushrooms daily for Mushroom Soup. Become an M.G.A. Grower and cash in on this big demand. Experience. un- necessary. We buy crop. FREE BOOK. MUSHROOM GROWERS OF AMERICA BD-433 N. Clark St. LEARN W | AT HOME Youcan learn by our modern and orig- inal system of instruction every part of the Watch Repalring Trade al home as good or better than at a shop. You can earn money while learning and se- cure a well paying position or start in business after completing our course of Instruction. Good watch repairers are always in demand and enrn very good salarles. For particulars apply to the MILWAUKEE SCHOOL OF WATCH REPAIRING " 524 E. MASON ST. Dept. C MILWAUKEE, WIS. Thank You for Mentioning Modern Mechanix and Inventions for January When Writing to Advertisers INVENTORS and MECHANICAL MINDED MEN Can you answer these questions? 1. What is the only effective way to protect an invention? 2. What is first step in making appli- cation for patent? 3. How many patents were issued to Thomas A. Edison? 4. To what president was issued patent for expanding air-chambers to lift river boats over sand bars? 5. How many years does a mechanical patent remain in force? 6. How does the issuance of a patent protect the inventor? 7. Is it compulsory to prepare a work- ing model before making application for patent? 8. What is a “Record of Invention” form? 9. Why does the Patent Office advise applicants to employ registered patent attorneys? 10. When can an article be marked “Patent Applied For”? For the answer to these questions and other information of value to you, look on page 138 and do 1001 jobs. Do away with slow hand work. Grinds, routs, drills, carves, sharpens, cuts, engraves.. For shop, home or tool kit. (Model A), A. C. or D. C. operation, Booklet MASTER CRAFTS- $10.00 | 000 r. p.m MAN’S SET and up Order on 17 useful accesso- Fostpald § day trial ries to grind, drill, polish,aand,cut, carve,en- with 3 wheel! ża ¢ CPOS | grave, etc. Prepaid $5.00," shapes Free. guaren- CHICAGO WHEEL &MFG.CO Ordertoday-| feed. 106S. Aberdeen St., Chicago, Ill. New DIESEL Engines! DON'T WAITI Diesel Power fs the big, new field for greater oppor- tunities and bigger pay. GET OUT OF THE RUT! BE AN EXPERT DIESEL ENGINEER and advance with this great new industry that is sweeping the world. i ES LEARN DIESELS in our big, natlonally- recommended DIESEL Schools and Shops. The originat, exclusive DIESEL Schools of the United States and Canada . . . establi mi ahead in training and equipment. . tablished many yoara and always More engines . . . more successful graduates... more Big Pay Jobs. Send for your FREE copy of “Diesel News,” containing up- to-the-minute Information about tho amazing opportunitles every- where for trained DIESEL men. HEMPHILL DIESEL ENGINEERING SCHOOLS, INC. 2120 San Fernando Road, Los Angeles, Catlf. P. O. Box [06, Chicago, Ill. P. O. Box 892, Oklahoma City, Okla. 509 Westlake N., Seattle, Wash. - 1043 Pender St., Vancouver, B. C. Nation-wide Employment Service ts Free to all Hemphill Graduates 29 Book K Explains All Practical School Courses—Day and Night. Book H Explains Home- Study Combination Course.

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"Til prove in only 7days Ican make YOU a NEW No other Physical Instructor has ever By CHARLES ATLAS Holder of the Title: “The World’s Most Per- fectly Developed Man” OU don't have to take my“ word — nor ihat of hundreds of my pupils who have added inches to their chests, biceps, necks, thighs, and calves. Prove for yourself in just one week that you can, too, actually become a husky, healthy NEW MAN! My Dynamic-Tension system does it. That’s how I built my- self from a 97-pound weakling to “The World’s Most Perfectly Developed Man.” Let me prove ihat you can get a big balanced muscular development in the same easy way. Gamble a Stamp—Mail Coupon for FREE Book! Dynamic-Tension is a natural method of developing you, inside and out—without using any pills, unnatural dieting, or tricky weights or pulleys, that may strain your heart or other vital organs. It goes after such ailments as constipation, pimples, skin blotches, and other conditions that keep you from really enjoying life. Gamble a slamp tnday. Mall coupon for a free copy of my new dMlustrated book, “Everlasting Health and Strenath.’’ It shows you, From actual photos, how I have developed my gear pupils to the same perfectly balanced proportions of my own physique, Jot your name and address down on the coupon. Rend jt to me personally. CHARLES ATLAS, Dept. 61, 115 Bast 23rd Street, New York, N. Y. CHARLES ATLAS, Dept. 61, 115 Ease 23rd Street, New York, N. Y. { want the proof that your system of Dynamic-Tenslon will make a New Man of me—give me a healthy, husky body, and big muscle “Everlasting Health and development. Send me your free book, Strength.” Name ... Address DUY wires aceieank ice a OO mene ee re ate © 1935 C. A. Ltd. 30 Pilots and Mechanics wanted for transport and com- mercial work. You can’t fly or service aircraft without U.S. license. Our new Commercial Aeronautics Course prepares you, in short time, to pass pllots’ or mechan- ics’ written Mcense examinations. Send TODAY for Free Bulletin. No obligation, American School, Dept. A128, Drexel at 58th, Chicago __. 250 Power AMERICAN MADE MICROSCOPE only $159 — Ideal for Student end Laboretory use, thle Is the most “compact instrument made possessing this power. Also hay, in addition to its 250X objective, a supplementary 70X objectiva, Substantial construction, Easy focusing. Fine optical system. Horseshoes stage. Adjustable, removable mirror, etc. FREE for Limited Time, complete and valuable biological outfit consisting of dissecting instruments, slides, insiruc- tion book, ete., with each purchase, : Only $1.50 postpaid while they last. J.H. WINN MFG. CO. (Ml HH Dept. 95 124 West 23rd Street New York Hl Print YourOwn Cards, stationery, advertising, labels, ‘paper, circulars, tags, etc. Save money and lime. Sold direct from factory only. Junior Press, $5.90; Jub Dress, $11, Power, $149. Do popular raised printing like en- graving with any of our presses. Print for Others, Big Profits Pays for itself in a short time, Easy rules sent. Write to fres catalog of outfits and all details. RSSATELIELED Tho Kelsey Co.. K-9, Meriden, Conn. Sure money. 20 to 200 fine signs or show cards a day with new multi-color spray screen and cut-out letter process. No ex- perience, Also decorate walls, furniture, fabrics and gifts. Big demand. Pays for itself in one day. Literature free. For sam- ples of work send 20c for mail- ing. Box 226, Berkeley, Cali-, fornia. Write today. for Christmas... * y% Modern Mechanix and Inventions One Year’s Subscription.................. $1.50 Other Gifts for Shop Fans 1935 Handy Man’s Home Manual..........$ .50 1934 How-to-Build-It .........0.....000.. 50 How to Build 20 Boats................-..-. 50 Mail Coupon NOW! SS. 2282222] Modern Mechanix Publishing Co., 529 S. 7th St., Minneapolis, Minn. Please send: 1935 Handy Man’s ManualOl 1934 How-to-Build-It Oo How to Build 20 Boats OF Year's subscription to Modern Mechanix and Inventions O and speclal gift card to Thank You for Mentioning Modern Mechanix and Inventions for January When Writing to Advertisers

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FARN (ASH Have FUN Casting loys With NEW Learn a trade easily, quickly—and earn money casting metal toys with amazing new HOME FOUNDRY Sets! Opportunity for BIG PROFITS! Big fun, too. Ideal for Christ- mas Gift! (Boys, show (his ad to your folks.) Get started NOW —vlsit your Dealer or rush your or- der to us for complete ‘‘5-Figure’’ Soldier Casting Set “A”, oe. $1.25 neers in irae pina Hurry. NEW | ELECTRIC S SETS E IIA new ew electric sets eset oniy nly $2.5: 95 35 postpaid: aid Each Set contains molds, paints, casting metal, electric ladle. brushes, handles, ete. Choose your com- É plete electric set now: No. D-21 (Machine Gunner & Buddies) No. D-22 (Cavalry & Infantry) No. D-23 (Airplane & Crew) No. D-24 (Racing Car & Group). Catalog FREE with order, or send 3c stamp. Orders shipped same day received. HOME FOUNDRY MFG. CO. 2933 W. Madison, Dept. 23-51, Chicago, U. S. A. RADIO ENGINEERING RCA Institutes offers an intensive course of high standard embracing all phases of Radio. Prac- tical training with modern équipment at New York and Chicago schools. Also specialized courses and Home Study Courses under “No obligation” plan. Ilustrated catalog on request. RCA INSTITUTES, INC. Dept. MM35 75 Varick St., New York 1154 Merchandise Mart, Chicago Recognized Standard in Radio Instruction Since 1909 Grow fancy giant mushrooms in cellar, attic, barn. New, easy, odor- less method. We show you how, fur- nish guaranteed materials and buy crops. Valuable big book and pictures free if you write quickly. (Est. 1908.) UNITED MUSHROOM CO. 3848 Lincoln Av., Dept. MM-1, Chicago LEARN TO READ BLUEPRINTS More money, bigger earnings, better jobs for you if you can read blueprints. You can learn, easily and quickly from this new course in 10 simple, understandable lessons. Many actual drawings—covering several different subjects. Twenty real blueprints, Practical. Concise. COMPLETE COURSE ONLY $2.95 POSTPAID Special Introductory price for complete course only $2.95 postpaid. Order today! MECHANIC’S INSTITUTE, Box 604, Detroit, Mich. New Streamlined ELECTRIC TRAIN “Silver Bullet” At last! The streamlined Electrle Train you have always wanted at a fraction of the usual cost. Needs no tracks or transformer—a big saving. Runs equally well in- ^ doors or outdoors on ordinary dry A cells. The Silver Bullet is fn- ished in black and silver—neat and flashy. Complete kit—requiring but a few minutes to entirely assemble only 250, plue !0¢ postage and packing. Rush your order to: INTERSTATE ELECTRIC COMPANY Dept. 10 Madison, Wisconsin DIESEL POWER A Coming American Industry The internal-combustion engine represents man 's supreme triumph of ma- chine power. Diesel engi- neers are in great demand. Many are Seana nesa- sary knowledge through spare-time study of this modem I. C. S. Course on Diesel engines. Free booklet] ELECTRICAL ENGINEERING —A Great Industry with a Great Future The new course in Electrical Engineer- ing covers this fascinating field thor- oughly. If you are just starting or are partly on the way to a real paying position in this industry, this new course rings the broader knowledge necessary for advance- ment. The coupon brings complete information. MECHANICAL ENGINEERING —A Field with a Future o a eee oo ee do $ investment in a Bigger Future, Use the coupon! AUTOMOBILE EXPERTS draftsmen, blacksmiths, foundrymen, are always in demand patternmckers, apprentices, and me- chanical engineers—men who wanted to get ahead and to earn more money. You will find, as they B have found, that enrolling for an I.C.S. Course is an The rapid progress in manufacture and service of the modem automobile brings Yes new opportunities to thousands of ambi- tious and forward-looking men. There's e always a demand for trained men. The A new I.C.S. Automobile Course will make you a trained man] The time to act is now. Uso the coupon. © INTERNATIONAL CORRESPONDENCE SCHOOLS BOX 2321, SCRANTON, PENNA, Without obligation, send me full information on subject checked below: O DIESEL POWER oO ATTOMORIE COURSE [ ELECTRICAL ENGINEERIN O MECHANICAL ENGINEERING Architecture : Concrete Construction Reading Shop Blueprints Drafting | ise Accounting Good Eng Saa Enan Civit Engineering Advertising Diesel Engines Show Card Lettering Gas Engine Operating Civil Service Refrigerat Chem ies Highway Engineering ing Inventing and Patenting Poultry Farming Avlation Enginee Name Address. Thank You for Mentioning Modern Mechanix and Inventions for January When Writing to Advertisers 31

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PACKARDS PRESIDENT In this vital, human story, Alvan Macauley, Packard’s president, has an inspiring message for every boy and workshop fan in America. HEN I was asked to tell readers of Mop- ERN MECHANIX AND INVENTIONS some- thing about the home workshop in which I have spent so many pleasant hours, I at first refused. I could see no particular good in discussing my own personal addiction to a hobby which is so widespread among the men of America, young and old—-the hobby of building things with tools. After some consideration, however, it ap- peared that I might well change my mind, for two reasons. First, because I believe I have learned one lesson in my workshop which I would like to pass on, particularly to younger readers; and secondly, because (as my young grandsons have often pointed out to me) my workshop is probably just the sort of place every boy dreams about. Possession of it seems to entail some respon- sibility toward others of the plane-and- chisel fraternity. I suppose anyone who possesses something dear to the desires of millions of boys ought to be willing to talk about it. :Therefore, much as I dislike to talk about myself, I resolved to do so for once on the theory that in this case the end might justi- fy the means. I have possessed tools of some sort ever since I was old enough to appreciate them. I think I spent the first half-dollar I ever earned for an oil-stone to sharpen my chisels and plane-blades. From the first my liking for tools took a bent toward wood- working, principally because wood is the 32 by ALVAN MACAULEY President of Packard Motors As told to PAUL WEBER Many of the refinements which grace Packard interiors, such as the carved paneling shown above, were inspired by tdeas born from Alvan Macauley’s home workshop hobbies. easiest material for the amateur artisan to work and because it gives excellent results with a minimum of equipment. My early activities in that line naturally inclined my mind toward the drawing- board, and for some time while studying law at George Washington university I was employed part time in a draughtsman’s office in Baltimore. At the same time, be- cause of my youthful love of the saw and chisel, I became interested in the study of woodworking as an art. The subject has held my attention ever since and a consid- erable section of my library is devoted to works dealing with the history of fine furni- Modern Mechanix and

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flA Flow Workshop Hobbies win Success/ Mr. Macauley has loved tools all his life. His first half-dollar was spent for an oil- ` stone to keep chisels, plane-blades sharp. ture and the technique of the craft. When I built my present home on the shore of Lake St. Clair in Grosse Pointe, Michigan, I provided plenty of space in the basement to accommodate my work benches and tools. The shop now contains lathes, vises, band-saws, planes, drills, chisels, etc., enough to handle almost any kind of wood- working job I would care to attempt. During recent years, the pressure of affairs has prevented me from spending a great deal of time at my bench and lathes. But I can look back upon—and forward to, I hope—many happy hours spent in the shop. One of my greatest pleasures has been to build things for my eight grandchildren, two of whom are boys, just at the tool-lov- ing ages of seven and ten. For the children I have built high-chairs, cribs, small chairs, Inventions, January, 1935 In the photo and drawing above is shown a section of the home workshop in which Mr. Macauley builds cribs, highchairs and toys for his grandchildren, and beautifully carved pieces of period-design furniture as gifts for friends. and numerous toys, including an armada of toy boats. l My other workshop projects have been chiefly pieces of carved furniture which I tried to make true to some period design. These were usually given away to friends —who, of course, had to be very much ` pleased. Quite frequently, business and pleasure find a common ground in my workshop. Many of the ideas I have contributed to the interior finishing of Packard automobiles— especially custom body jobs—have had their inception while I was chiseling away at some project in my basement. | Every boy who shows a love of working 33

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Lessons Learned in Home Workshop Bring Private and Industrial Success When Alvan Macauley built this beautiful home on Lake Se. Clair, Grosse Pointe, Mich., he saw to it that ample space was provided in the basement for his shop and tools. with his hands should have a workshop, even though it be no more than an old kitchen table, equipped with a saw, ham- mer and jack-knife. I say that because I know from experience what important things a man can learn while working with his tools. The process of conceiving and executing one’s own designs with one’s own hands cultivates invaluable habits of care- fulness, precision and self-reliance. I believe, however, that the most valuable habit a workshop can teach is the habit of doing things according to plan. Every small boy has known the disappointment of try- ing to build a doghouse or a model airplane without first making a plan, either on paper er, if the job be very simple, in his imagi- nation. Of course, it is futile to try to con- struct a piece of fine furniture without first setting its every dimension and contour down on paper. That is why the draughts- man’s pencil always precedes the chisel of the artisan. If. a youth can learn the importance of planning from having a workshop of his own, a small expense in tools and space will certainly pay him heavy dividends. For I have found that this habit of making a plan before starting to build is just as necessary to the conduct of a business as it is to the construction of a desk or table in my shop. Plans do not always work out as expected. But when there is no plan, the usual result is that nothing works out. If you will pardon my going into the his- tory of the Packard Motor Company, I (Continued on page 141) 34 The Macauley living room. Note the beamed ceiling and paneling, illustrative of his love of fine craftsmanship. The Liberty engine assembly line during the World war, when Packard first turned to mass production methods. Modern Mechanix and

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Kingsford-Smith Makes Record Pacific Hop Lifting his Lockheed monoplane, the “Lady Southern Cross,” into the air over the world’s largest ocean, Sir Charles Kingsford-Smith and his navigator, Capt. P. G. Taylor, hung up a total of 7365 miles in less than 52 hours’ flying time. TLOTING an American-built Lockheed Altair monoplane, Sir Charles Kingsford- Smith and his navigator, Capt. P. G. Taylor, recently set a new flying record by hopping from Brisbane, Australia, to Oakland, Calif. A total of 7365 miles was covered by the intrepid airmen in less than 52 hours’ flying time, with stops at Suva and Honolulu. The flight was not without its dangers. On the 3197 mile leg, Suva to Honolulu, general- ly conceded to be the most dangerous over- water air course in the world, the fliers en- countered a torrent of equatorial rain which forced the ship into a tailspin. Only quick work on the part of the men averted a crash landing in the sea. Handle Opens One-Piece Razor AILED as dis- tinctly revolu- tionary in design, a new one-piece safety razor has been placed on the market, Compactly built, the razor has no separate parts and is said to be ex- tremely simple in operation. A twist of the handle opens the cap of the razor to re- ceive the blade. Another twist closes the blade receptacle, pre- paratory to shav- ing. The appear- ance of the razor is enhanced by a plating of gold. Blade closes by twisting razor handle. teceptacle opens and Inventions, January, 1935 Chicken Guests Fill Miami Hotel. BANDONED by a real estate syndicate, a Miami hotel has been turned into one of the world’s largest and. most palatial chicken coops by the ingenuity of Maurice R. Harrison, graduate engineer turned poul- tryman. Securing a long-term lease on the proper- ty following its abandonment by the origi- nal owners, Harrison installed batteries of wire cages and promptly populated the hotel with about 60,000 chickens.. Each hen has an individual compartment. supplied with a private feed trough and a drinking fountain of freshly flowing water. Floors of the laying cages are slightly at an angle, permitting eggs to roll into a con- venient trough to speed egg-gathering. Above, a battery of -laying cages. Right, photo of M. R. Har- tison, poultryman. Abandoned by a real estate syndicate, this Miami hotel has been‘ converted into the world’s most palatial hencoop.” 35

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Telescope Trailer Shrinks or Grows at Will of Operator Y MEANS of a light screw- jack said to be easily manipu- lated by a child, a new telescopic - trailer in Nice, France, may be shortened or extended to suit the owner’s requirements. The trailer is 7 feet wide with a normal length of 37 feet. When the double extending leaf at each end is pulled out, however, the length is increased to 55 feet. The trailer rests on a single axle A French inventor has solved the problem of devising a traveling home and workshop with this telescope trailer which may be extended from 37 to 55 feet. Top photo shows normal length of trailer; lower photo, extended. Train Sets Record Across U. S. OMPLETING a cross-country run of 3258 miles from Los Angeles to New York in 56 hours and 55 minutes, the Union Pacific’s bullet ‘train, M-10001, recently hung up the fastest coast-to-coast run ever made on rails. One full day was cut from regular express schedules by the M-10001 which climbed grades in the Rockies at 50 m.p.h. and scorched across the plains between Dix and Potter, Neb., at a speed of 120 m.p.h. The bullet train’s engine is a V-type Diesel used in combination with electric power. A 12-cylinder, two-cycle Winton engine, de- livering 900 h.p., drives a generator which furnishes power to four electric traction motors. The train is composed of six.cars and has a total weight of 200 tons as com- pared with 700 tons for a steam train of similar size. A regular 40-hour schedule is planned between Chicago and the Pacific coast. Top—Record train be- ing towed into New York by electric loco- motive in accordance with city statutes, Right —Part of crowd which hailed record- breaker. 36 ` coils as key is in- without support fore and aft, but perfect equilibrium is said to be maintained. Used as living quarters, work- shop and showroom by a French inventor, the total weight of the carriage plus its furniture is only 5000 pounds. The body consists of 15,000 pieces of wood glued together, ies by a layer of linen cloth and var- nish. i Outboard Powers New Motorsled Photo shows or- dinary outboard mounted onnew - streamlined win- ter sports sled. NEW thrills await winter sportsmen in a streamlined sled which is powered by an ordincry outboard motor. Conversion of the motor from boat to sled is said to be a simple matter. In test performances a 2% h.p. outboard twin turned a prop at 2000 r.p.m., delivering a thrust calculated to drive the sled at a speed averaging from 35 to 40 miles per hour. Spring Makes Key Self-Ejecting BOON to auto- ists who have a habit of leaving their keys in the lock is a self-eject- ing key which shoots back into the hand. A strong spring installed in key’s slotted shank serted, furnishing ejecting power as key is straight- ened. Coiled spring in shank causes key to shoot out of lock and back into the operator’s hand. Studs coil spring or release it as key is inserted or withdrawn. Modern Mechanix and

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NEW TOYS ALMOST HUMAN DOLL feeds from bottle, cooing happily as she sucks pure water through ‘nipple. Take the bottle away and she'll start to cry. Bathe and powder her as you would a real baby—body is air and water-tight, even though arms, head, and legs are movable. Eyes remain closed when head is turned slightly. TYPEWRITER priced below three dollars uses standard rib- bon, has all characters found on large commercial machines. SPEED SLED finished in gleam- ing chromium has third runner in center, attached to steering handle. So simple is new STEEL LOOM model at right that any child can make real rugs from colored yarns, ZEPHYR STREAMLINE TRAIN model will operate over regular narrow gauge switches and track, turning in 33-inch radius circle. ‘Floating power” motor, truck, and car design makes possible scale model speed of 150 m.p.h. Three-unit train is 32 inches long; each car has flickerless lighting system. Entire train is finished in polished stainless steel. just as is “Burlington’s” Zephyr. Train operates with standard transformer eliminating need for special control equipment. Inventions, January, 1935 37

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by JAMES DYSON American transport ships eclipse speed victory of British racer in dash half way round the world. Radio movies and other technical sidelights revealed here. €apt. C. W. A. Scott (right) and T. Campbell Black, race winners, are shown above. Right—Details of their special D. H. Comet racer. ut MASS BALANCE FOR RUDDER SHARPLY TAPERED WINGS COVERED WITH 2 LAYERS OF NARROW-BOARDS LAID DIAGONALLY AND CROSS- WISE WITH FABRIC COVER WOOD SKIN‘OF- FUSELAGE ALL RUBBED DOWN? S TO SATIN-LIKE SURFACE THE greatest race in the history of avia- tion, 11,358 miles from London to Mel- bourne, was won by an English ship, but proved that the United States is supreme in the air. By flying the distance, half way ’round the world, in 70 hours, 54 minutes, 18 sec- onds, the English plane, specially built for the race, won the $50,000 cash first prize in the speed race and $2,500 gold cup of- fered by Sir MacPherson Robertson, Aus- tralian candy manufacturer. The astound- ing time, less than three days, cut by more than half the record of 6 days, 17 hours, 56 minutes established in 1933 by Charles J. P. Ulm. This great speed, averaging 176 miles per Black and Scott are shown in their Comet racer just before the takeoff in the race that broke all distance air speed records. Note two streamlined nacelles for small 225 horsepower special motors. 4OGALFUEL RELIEF PILOT OR NAVIGATOR TANK = SPAN = 4a Fr. PILOT’S LENg g COMPT'MT. TH B 120 GAL. FUEL SA TANK MIDSHIP NS FILLERCAP Pate VENT PIPE 100 GAL. FORWARD a RETRACTING \4 GEAR PISTON PORT MOTOR . FAIRING SEALS WHEEL STARBOARD MOTOR H IN RETRACTED POSITION IANGER hour in flying time, was eclipsed, however, by the feats of two American ships which arrived in second and third positions in Melbourne. Both were standard commer- cial airliners, similar to those used on the regular transport lines in the United States. The British ship, on the other hand, was planned and built for the race. It had not seen commercial ser- vice. It was in effect a flying gas 38 Modern Mechanix and

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tank intended for racing. Eventually it probably will be put into commercial ser- vice, but before that can be accomplished it will have to be modified to provide room for passengers and cargo. Of the two American ships in the prize money the outstanding performance was accomplished by a standard Douglas DC 2 airliner flown by the Dutch team of K. D. Parmentier and J. J. Moll. It was the second ship to reach Melbourne, its handicap time being 3 days, 4 hours, 38 min. It outshone the winning D. H. Comet, by flying approxi- mately 1,000 more miles by stopping at every checking point on the route and by Inventions, January, 1935 CONTROL POINTS (ALL CONTESTANTS) O CHECKING POINTS (HANDICAP ONLY) Above—Map showing routes of handicap and speed fliers and time that would be required for winning plane to reach planets and the moon. Left—J. J. Moll (left) and K. D. Parmentier, Dutch fliers, who turned in the out- standing performance of the race with a stock Douglas. carrying six persons, to the British plane’s two, a cargo of mail, baggage, and food for passengers and crew. The second American ship to press the British racer was a Boeing 247D transport plane flown by the noted fliers, Capt. Roscoe Turner and Clyde Pangborn. They landed in Melbourne just three hours after the Dutch team. Their total time from London to the Australian city was 3 days, 20 hours, 55 minutes. The greatest scientific sidelight of the race was the transmission by radio of news- 39

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United States Airliner, Carrying Passengers, Mail, Surprises Air Experts Above—Turner’s Boe- ing ship. Left—Roscoe Turner and Clyde Pang- born, U. S. team that placed third in the race. reel movies of the finish from Melbourne to London. Two days after Scott and Black arrived in Melbourne, London movie pa- trons saw them on the screen.. The movies were transmitted by enlarging each frame of the newsreel in Melbourne.. Each en- larged photo was transmitted by radio to London, where it was reduced and trans- ferred to its proper place on a movie film. The race was run in two sections, a speed race and a handicap race. All time in the air or onthe ground was counted against fliers in the speed race. They had to stop at only five control points averaging about 2,000 miles apart. Planes in the handicap race had to stop at these control points, but in addition could stop at 17 checking points, averaging about 500 miles apart, without losing time in the race. Only time spent be- tween these cities was counted against the fliers. When the Dutch team flying the American Douglas announced that they were entering the race not merely for the prize, but to (Continued on page 142) This American built Douglas airliner astounded air experts by placing second’ in speed race even though it carried Passengers and mail. Above—-Turner inspecting special tanks in his Boeing for more than 1,000 gallons of gas. 40 Modern Mechanix and.

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Plans Submarine Cargo Route England to Japan IMON LAKE, “father” of the modern submarine, recently startled shipping interests with plans for a proposed line of cargo-carrying submarines to be routed over the top of the world, England to Japan, via the Arctic and Pacific oceans. According to Mr. Lake, the proposed route is expected to cut in half the present cargo schedules of surface ships by the expedient of finding a channel beneath the masses of Arctic ice. Mr. Lake has already passed the purely speculative stage in his plans with the con- struction of a model from which he expects to build a 400-foot, 13,000-ton craft. Provi- sions for navigating under ice have becn made by installing collapsible stacks, mast and periscope on the model submersible. Snow Samples Show Water Content Sample tubes are shoved into snowbank to secure a core of snow which is weighed and measured to determine the amount of water content in an entire mountain snowfield. HROUGH the work of scientists who weigh and analyze snow samples, west- ern farmers dependent upon mountain snow packs for irrigation may know in the winter months just how much water they can ex- pect in their reservoirs during the coming summer. The tests are made at high altitudes where the ice fields are slow to melt. Sample tubes are pushed into the snow to secure a core which is carefully weighed. By determin- ing the ratio between the height of the sam- ple and its weight the water content of an entire snow field may be estimated. Thus, if the snow is fluffy and has a cor- respondingly low water content, ranchers may be prepared to face serious water shortages or rapid melting resulting in floods. Solidly packed snow, on the other hand, melts slowly and assures a steady flow of water to the storage reservoirs. Inventions, January, 1935 Photo shows Simon Lake, in- ventor of the modern sub- marine, with a model of his new cargo-carrying undetsea beat. Globe shows the proposed route from England to Japan. Pilot Sets Record of 440 M.P.H. URLING his “flying engine” through the skies at the incredible speed of 440.6 m.p.h., Lieut. Francesco Agello, senior pilot of Mussolini’s High Speed Flying School, re- cently broke his own world’s record to hang up the fastest time ever made by man. Agello’s record was made on a 3-kilo- meter course over Lake Garda in northern Italy, site of the school whose members have set as their goal a speed of 600 m.p.h. Known as the Red Bullet, Agello’s ship is a specially built Macchi seaplane, powered by a 3500 h.p. Fiat motor. Only 161 square feet of wing surface support its 3-ton weight, a wing-load twice that of commercial planes. The ship lands at 130 m.p.h. This speed makes the plane one of the most difficult in the world to land. Lieut. Francesco Agello, Italian ace, standing beside the Macchi-Fiat in which he set a new world’s speed record. 41

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Giant Air TOWER to GUARD PARIS O GET defense aircraft into action more quickly, architects of Paris have worked out plans for a huge aerodrome tower, more than a mile in height, which will literally hur! planes into the air at the 5000-ft. level, ready for combat. High-speed elevators would bring planes from the roof-top-level landing field up to each of the three aerodrome platforms. Swooping downward after leaving the in- clined take-off platform, planes would reach flying speed with little loss of altitude. Towering into skies for more than a mile, proposed Par's aerodrome tower would have three decks, with roof-: > landing field built around base. Artist’s sketch shows h ~ structure, if built on river Seine, would dwarf Eiffel towcx. Cutaway sketch below shows how Paris defense planes stored in lower aerodrome of tower are taxied dow sloping platform, gaining momentum for dive in:o space from outlet ports. Left: cross-section of upp -: third of tower shows elevator leading to top aerodrome. x ee ; LIDING PLANGF-EKEVATO! | ELEVATOR | LAT OTOP. AERODROME. ; DOORS ş STORAGE z $ = ARMORED. PLATFORM eS ek TAKE-OFF” PLATFORM “= VIEW. SHOWING | NARPLANE © INTERIOR OF AERODROM OUTLET PORTS PLAN- OF ELEVATOR-ARRANCEMENT PLATFORMS UPTO. SECOND AERODRO 42. Modern Mechanix and

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California Mechanic Constructs Virtually Foolproof Auto my UGGESSPULLY passing a series of rigor- ous tests, a new “foolproof” car de- veloped by a California mechanic may mark a new era in the automobile industry. A low center of gravity, even weight dis- tribution and specially built springs give the car amazing stability. Driven at a speed of 60 miles an hour over a three foot bank, the car jumped nearly 52 fect yet remained upright. In another test the machine was driven backward at 50 miles an hour and thrown into a sharp U turn without over- turning. It is said that the car must be tipped at an angle of more than 50 degrees to turn it over. Built of metal, the coupe body may be lifted by one man; yet a 2-ton weight may be dropped on it from a height of 10 feet without incurring serious damage. Photo shows portable router in use. Note compactness of unit and finger grip which affords complete control of tool. Portable Router Aids Shop Work OMBINING light weight with speed, a- new. portable router is said to be an invaluable aid to the shop worker. - Weighing only four pounds, the router is driven at high speed and embodies many unique features. The depth of the cut, for instance, is quickly and easily regulated by a thumb screw. A convenient finger grip affords complete control of the tool. No expensive or elaborate attachments are needed for the router, which is capable of performing a number of varied tasks around the shop. In actual tests ‘the machine-has successfully performed oper- ations such as routing, grooving, rabbeting and template routing. Inlaying, molding cuts, shaping, dove-tailing and carving are all said to be possible with the machine. Inventions, January, 1935 Hitting a three-foot bank at 60 miles an hour, the fool- proof car jumped nearly 52 feet but remained right side up. Grid Star Invents Downs Marker NVENTED by Stan Borleske, former stel- lar end at Michigan (1909-10), a new linesman’s indicator takes the guesswork out of the job of measuring football yardage. The device embodies the principle of visual triangulation employed by surveyors. Two poles are connected by a 10-foot chain. One of the poles has a sighting tube which simultaneously reflects both the position of the ball and two flags placed on the side- lines at opposite ends of the field. By centering the hairline sight on the ball and securing the proper focus on the equi- distant flags, the linesman can instantly de- termine the 10-yard point and tell whether or not a first down has been made. By lining up ball with flags on sidelines at opposite ends of football field, linesman can quickly measure yardage. 43

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Win CAS H foc Fumtwe At right is a battered old fashioned chair that was con- verted into the modern occasional chair shown in circle on next page. Photo above shows upholstering being tacked in place on arm of chair. Seat is ready for cotton batting. Do you enjoy rebuilding second hand furniture or do you prefer to work out your own designs for tables, chairs, floor lamps and other articles for the home? In either case you have a chance to win one of 14 prizes totaling $125.00 in this contest, the second of four offering $500.00 in cash. This month the prizes are offered for the best ideas from readers on rebuilding or designing furniture. Many of you have converted old radio cabinets into beauti- ful chests, second hand rocking chairs into porch swings, and old-fashioned furni- ture into more modern pieces. Others have designed furniture along modernistic, colonial, mission or other period lines. To enter this contest all you have to do is tell as briefly as possible how to build or rebuild any article of furniture for the home. Read the rules and list of prizes on the next page and then send in your entry. The following article will show you one way to prepare your entry. by J. JULIUS FANTA E-UPHOLSTERING a set of old furniture has various distinct advantages one should not pass up when making household changes this winter. If you are tired of your . present set, you can acquire at low cost a suite of castaway chairs. Under the dust- covered, shredded pieces of grandmother’s day are just the “makings” of a set now in vogue. Should your present set be on its last 4A - yards of the same material. Here’s your chance to win one of 56 ptizes, totaling $500.00 in cash. This is the second of four big contests for home improvements for MM readers. = DETAIL: SHOWING: SPRING ARRANGEMEN All old upholstering is removed. - The tops of the springs ate spaced evenly and held in place with cord as shown. legs, look for one that’s still solid in struc- ture, with sound joints. The condition of the upholstering does not matter since we must re-upholster to bring the chairs up to date. In buying material figure about 2% yards of 54” tapestry for two small chairs. For a two-person settee you'll need three Three yards of 4” webbing are required to support the springs of a small chair. Larger pieces should be measured for the exact amount, SEE FEBRUARY M-M Modern.Mechanix and

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IDEAS '5 LOOSE HORSE HAIR SECTION SHOWING THE PADDING ARRANGEMENT — % Cross section. above shows layers of ma- terial needed, Right —Fasten springs to slight CROSS. SECTION form crown, allowing 14%” between each strip. To freshen up the old job, light canvas, cot- ton batting and burlap should be included on the shopping list. A half-dollar will cover the cost of a mag- netized hammer, a 3” curved upholstery needle, tacks and upholstery twine. Much time can be saved by using a. magnetized hammer to set the tacks in close quarters. Begin by removing the tumble-down up- holstery with a screw-driver. Clear the chair right down to the “bone.” Make sure FOR THIRD CONTEST Inventions, January, 1935 Pull webbing taut with 8 in. board padded at one end and sharpened nails at other. Put padded end against chair, catch webbing on nails, with leverage action draw taut. that you have lifted out all the old tacks embedded in the tack panel. The old tapes- try, padding, etc., should not be immediate- ly destroyed but preserved to insure accu- racy in measuring all new parts. There will be future use for most of them. The webbing which serves as the founda- tion for the springs is basket-woven across (Continued on page 129) RULES FOR SECOND CONTEST Suggestions for building or rebuilding any article of furniture used in the home can be entered in this contest. Readers can submit as many entries as they wish. Entries may be submitted in all four contests and prizes won in all four. Furniture ideas must not call for professional ser- vices, All work must be within the scope of the average home workshop man. Each entry must include a written description of 1,000 words or less, giving detailed instructions on building or rebuilding one article of furniture, Rough sketches to illustrate the design or work involved should be included. Photographs are not required. Do not submit actual articles of furniture. Fourteen prizes will be awarded for the best and most practical ideas as follows: first prize $60.00; second prize $20.00; third prize $8.00; five fourth prizes at $5.00 each; six fifth prizes at $2.00 each; total $125.00. é Modern Mechanix and Inventions reserves the right to publish any entry winning a prize without further compensation to contestant. i Each contestant agrees to permit Modern Mechanix and Inventions to publish all or part of any entry not winning a prize. Entries so used will be paid for at regular rates for the amount of material published. No entries will be returned. Address entries to Furniture Contest, Modern Me- chanix and Inventions, 529 S. Seventh St, Min- neapolis, Minn. All entries. must reach this office before midnight, January 22, 1935. Winners will be announced in the April, 1935, issue of Modern Me- chanix and Inventions., The third contest in this series will be announced in the February issue. The first ` contest was announced in the January issue.

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German Death Ray Pistol Stuns Animals at Mile Range This death ray gun is said to be capable of stunning men or animals at one mile range. The queer magnesium pistol is being demonstrated in Paris by its German inventor. Tree Wrecks Piccard Strato-Balloon SCENDING ten miles into the strato- sphere on the trail of the mysterious cosmic ray, Dr. Jean Piccard crashed into a tree in landing, wrecking the giant bal- loon and slightly damaging the gondola. Mrs. Jeanette Piccard, who accompanied her husband on this latest visit to the purple stratosphere, is the first woman ever to brave the hazards and intense cold of the ascent. The silvery bag soared aloft from the Detroit, Michigan, air- port, remaining in the air for eight hours while the Millikan apparatus clicked away its rec- ord of cosmic ray arrivals. No attempt was made to set a new altitude record by re- leasing ballast. With a solid bank of clouds separating the earth from the Piccard party, it was thought inadvisable to risk tumbling through the clouds on the descent without ballast for emergencies. Though the landing was, in the words of Mrs. Piccard, “a mess,” none of the scientific instruments were damaged. Upon developing the cosmic ray film record, Dr. H. V. Neber, assistant to the famous Dr. Millikan at Cal Tech labora- tories, said, “It is one of the best recordings ever made.” 46 AX ODD-LOOKING pistol firing a magne- sium charge said to be capable of stun- ning men and animals a mile away is now being demonstrated in Paris. Its inventor, a German who was forced to flee from his native land, hopes to sell the idea to the French government. Scientists believe the operation of the de- vice is based upon the “thermit reaction” now used in certain welding operations. The reflector mounted on the barrel of the gun would concentrate the deadly heat rays, and protect the operator from the dazzling glare of exploding magnesium. Bike Pedal Light Warns Motorists OLORED reflec- tors designed for mounting on bicycle pedals were recently in- troduced in Eng- land as part of a |. “safety first for j| Ke cyclists”? move- | REFLECTING ment. | PEDAL. | The colored glass crystals, be- ing continually in motion as the cyclist pedals along, glow bril- liantly when in headlight beams of approaching cars. Colored reflecting crystal mounted beneath each bicycle pedal gleams in the glare of ap- proaching car, warning motorist. Dr. Jean Piccard and his wife climb into hermetically sealed gondola for take-off into stratosphere, Photo at right shows huge bag rising from airport. Modern Mechanix and

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Rotary Golf Game Affords Winter Practice VETERATE golfers who insist upon keeping their swings grooved the year *round will welcome a new device which combines practice and pleasure in a novel. manner. The apparatus consists of 10 tubular metal coils, 15 feet in diameter. These sur- mount a 20 foot funnel-shaped approach, set at an angle of 25 degrees to the driving tee. The distance traveled by the ball through the metal tubes indicates the length of the drive. At intervals of 15 yards a red: neon light, attached to a sensitive mercury switch, shows the player what yardage he has attained. Only hard, perfectly hit drives register in the 300 figures. Hooks and slices penalize the golfer as in actual play. The ricochet- ing action of an off-line ball naturally slows the forward motion and cuts down the theoretical yardage. Netting protects play- ers and spectators from wild shots. Artist Makes Pasteboard Masks A NEW sculptor’s medium has been de- & vised by Stanislaw Raczinsky, Polish artist, who utilizes colored pasteboard, skillfully cut and clipped together, to make striking, modernistic masks. Shown above are two of the masks skillfully fashioned from colored pasteboard by the Polish artist, Raczinsky. Inventions, January, 1935 In addition to registering yardage by neon lights, device drops golf balls through funnels to score various holes. A return pipe brings the balls back to the driving tee. “Cabin” Life Preserver Tested HIPWRECK at sea may be robbed of some J of its terrors with the introduction of a new de luxe life preserver resembling a small-sized navigation buoy. The “cabin,” or upper part of the device, is equipped with a combination door and window which may be closed against the threat of heavy waves. Made of inflated rubber, the device is composed of two sections, as a safety measure. Thus, if one sec- tion becomes de- flated, the other still serves as a spare. Atop the preserver is a small flag to at- tract the attention of any possible rescue craft. Closeup of cabin life preserver, showing observation window. 47

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WEALTH in by JAMES NEVIN MILLER NLY a few miles from Rapidan Camp, Virginia, where President Hoover once maintained his summer White House, a vein of gold is being worked that promises to develop into one of the richest ever discov- ered in the East or South. The nation’s newest gold diggings center in the Melville and Vaucluse mines near Wilderness, about 20 miles southwest of Fredericksburg—the heart of the historic region where some 30,000 Confederate and Federal troops perished in the bloody battle of the Wilderness. Although activities in the district are new, the mines themselves are not recent discov- eries. Worked in the days prior to the Cali- fornia gold rush, the mines were later abandoned as the nation’s gold seekers turned to more heavily paying fields. Then the government stepped in recently and set a new value on the precious metal—official- ly pegged the price of gold at $35 an ounce Photo above shows last station on the gold trail — the sacked concentrate ready for the smel- ter. Left, wheeling the gold concentrate to the huge bak- ing oven for drying. Into the revolving masticator shown above, the ore is placed and broken down preparatory to the “flotation” process described in the text. At right, one of the tiny ore cars, deep in the mine. Thus far, about 1600 tunnels.have been laid along the gold vein. FOLLOWING THE TRAIL OF PRECIOUS METAL | 48 Modern Mechanix and

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Virginia's N —and the wheels of the mining industry again began to hum in the Virginia hills. Today the workers in the Wilderness mines have sunk shafts 220 feet below the surface and are mining quantities of ore which assays around $5 to the ton. And even more important is the fact that dis- covery of pay dirt in the abandoned Vir- ginia diggings may create a new American $ gold field. Federal mining specialists have been fired with enthusiasm over returns from the Wilderness mines. As a result, they are planning a thorough probe of the Appa- lachians, once regarded as the righest gold region in the United States, for other new or abandoned mines. Most of the 75 men working the Wilder- ness mines today are rank novices, farmer boys in fact. But thus far they have shown themSelves to be adept pupils in learning the necessary semi-technical facts about blasts, ore faces, mucking and drifts. Supervising their work is an extremely able mining engineer, C. Hyde Lewis, who’s Above, exterior view of Melville mine. Ore is elevat-' ed in cars to second story and then chut- ed to another build- ing for initial re- fining. Left, group . of miners starting their 220 foot drop down the mine shaft. All photos taken exclusively for MODERN MECHANIX AND INVENTIONS by Lindquist, Washington, D. C. also vice-president of the Rapidan Gold Cor- poration which owns and operates the mines. While the RGC is the only company actu- ally mining in the immediate region, quite a number of other companies are buying up much of the nearby land for the purpose of sinking exploration shafts. Among these is a prominent Pittsburgh outfit, while a handful of wealthy Canadian engineers are continually browsing about. (Continued on page 119) Equipped with ham- mer and pneumatic drills, miners are wresting quantities of paying ore from the abandoned mines recently. re- opened in Virginia. The ore is estimated to assay approxi- mately $5.00 a ton: IN THE NATION'S NEWEST GOLD DIGGINGS Inventions, January, 1935 : 49

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‘Wind-Propeller Sails “Proposed For Liners Air blast from fan turns windmill mounted on model boat, in demon- stration at English inventor’s exhibit. At right is artist’s conception of ocean liner ‘using the wind-propeller sails. IANT fan blades whirling rapidly in ocean breezes are proposed by an Eng- lish inventor as a substitute for both sails and engines on ocean-going vessels. Mount- ed high above deck, the whirling propeller would transfer the wind’s unlimited power to the marine screw propellers of the boat. A working model of the windmill ship was on demonstration at the Inventions Exhibition sponsored by the Institute of Patentees at Westminster, England. Since the propeller could face into the wind regardless of the direction the ship is traveling, it is believed highly probable that windmill boats could travel directly into the wind. A generator mounted on the windmill tower could develop current for electric motors mounted on the propeller shafts, or a shaft could be used to transmit the power. Tack Hammer Has Automatic Feed N AUTOMATIC A staple - driving hammer operating like and resem- pistol drives staples home with a single blow when the trigger is pulled. The de- vice holds a clip of fifty tacks at one time, Squeezing trigger of new tack- hammer releases spring, auto- matically setting a staple and driving it in with one blow. 50 bling an automatic ` Radium Produced From Table Salt S THE first practical transmutation of one material to another, a process for changing common table salt into a radium- giving salt has been announced by Dr. E. O. Lawrence, professor of physics at the University of California. Though the salt radium is no different in appearance from common salt, it gives off rays more powerful than those ordinarily obtained by physicians from pure radium. The new salt costs less than radium. Since salt is harmless, medical experts believe solutions of the new radium can be injected directly into cancer areas. - ° Prof. E. O. Lawrence is pictured above with elaborate ap- Paratus he used in changing common salt into radium-giving material more powerful for medical use than pure radium. Modern Mechanix and

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Jce Finger, SPINNING COFFEE POT Make HOME TASKS More PLEASANT. PIE PLATE RIM, easily snapped in place, prevents juices from running over edge into oven, allows baking of ex- tra-thick pastries. SPINNING COFFEE POT whirls hot water through ground coffee at high velocity, making coffee from hot water in from 1 to 4 minutes, depending upon flavor and strength preferred. HEAT BOUNCER in form of thin aluminum sheet slips back of radiator, throws heat out into room by reflection from foil. Inventions, January, 1935 al DRAWER OVEN for electric range works like filing cabinet, eliminating stooping to inspect bak- ing. Compartment slides out on roller bearings, rear panel keeping heat in oven if drawer is out. ICE MASSAGE finger closes pores of skin, stim- ulates circulation same as piece of ice does, without annoying drip of water. Metal tube is filled with refrigerant solution, and cooled by storing in ice- box just before using. 51

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“Previewing AMERICA’S by GLENN JENKINS ANY new and important improvements i have been built into the new 1935 auto- mobile models. Greatest strides have been made in engineering, rather than design, al- though the latest cars show a decided con- tinuation of the streamline idea, emphasiz- ing refinement of the so-called flowing lines which startled motordom last year. Engineers, through discovery and inven- tion, have been able to add from 25,000 to 50,000 miles to the life of the average car. As a matter of fact, more real engineering is now going into the light car than ever, because the competition there is keener and every manufacturer is straining himself to give the most for the money. Greatest interest this year centers around the Chrysler group, which includes Plym- White introduces a truck engine with. horizontally op- posed cylinders, which can be pulled out on a dolly. Streamlines continue to hold the spot- light. Chrysler’s “bull nose” hood is said to be out, and the “hound’s nose” is in. Beaver-tails are bigger and broad- er, anticipating the rear-mounted en- gine. Here is the latest advance informa- tion on America’s 1935 automobile— how it is built and what it will look like. outh, Dodge, DeSoto and Chrysler models. The airflow lines, when they are seen for the first time at the New York Show, will have undergone refinement. Chrysler en- gineers have made it known that the airflow trend is scientifically correct and they will continue in that direction. Therefore, changes, according to advance information, will be in refinement of the front end to do away with the “bull nose.” The car of the future, according to Chrysler designers, will have a nose like that of a hound, out- stretched and going places in a hurry. The tendency is to design lines and contours that will give the impression of speed even though a car may be standing still. The most pronounced development of the year is the treatment of the rear ends of many models. The beaver tail is more affected and refined. The reason for this, as ‘explained by one leading designer, is to get the public accustomed to this style, be- cause the beaver-tail lines are necessary to house the engine in the event that it is meved from under the hood to the rear axle. Henry M. Crane, technical assistant to the president of General Motors, gives an inti- Chevrolet broadens its line with a new four-door, five-passenger sedan, said to set a new price low in the six and eight cylinder field. 52 Extra leg room for rear seat passengers is provided in the new models by recessing back of front seat. Modern Mechanix and

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1935 AUTOMOBILES Chrysler engineers have definitely adopted the airflow principles, but advance information indicates that the ‘bull nose” is doomed and will be superseded by the “hound’s nose” design similar to that illustrated in the photo above. mation of the attitude of GM by declaring that only gradual changes in car design are being undertaken. General Motors points to Cadillac and LaSalle design as its ideal of streamlining, and is expected to follow this trend. Mr. Crane declares that improvement in brakes have not kept pace with speed in- crease, and much must be done to effect needed changes, though radical departures seem to him as unlikely. Wider use of cast iron drums is anticipated and much needs to be done to assure uniformity of brake action under varying weather conditions. Packard engineers have solved the prob- lem of designing louvres in keeping with the streamline trend by locating them under the front fenders. Heat from the motor passes through these louvres, travels along the un- der side of the fender and away from the body, excluding motor heat from the car’s interior. The new treatment affords design- ers more freedom in handling the orna- mental space formerly occupied by the louvres. Another new Packard feature is a model seating nine passengers—three on the back seat, three on the folding seats and three in front. Persistent rumors also indi- cate that Packard will produce a light car destined to offer competition in the medi- un-priced field. Hupmobile’s most startling announce- ment for 1935 is the inclusion in its line of a 5-passenger, 4-door sedan which lists at less than $700. The new model develops 91. h.p. and has a 117 inch wheelbase. Power. brakes are a feature of all models in the 1935 Hup line. One of the most unique developments for 1935 is the “pancake” truck engine an- nounced by the White Motor Company, a (Continued on page 128) Left—How Packard engineers solved the problem of designing louvres in keeping with streamline trends by placing them under the front fender. Note that louvre space is ornamentally treated in the new Packard shown at the right. Inventions, January, 1935 53

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“Robot Ends Stalled, Frozen Car “Danger When this switch is unlocked, motor robot Starts parked car just often enough to keep engine warm, When driver turns ignition key on, engine starts automatically, N ELECTRICAL robot that prevents automobiles from freezing while parked in zero weather is one of the outstand- ing motor accessories to be placed on the market recently. With the robot installed on his car the motorist can forget about his parked automobile because the device automatical- ly starts the engine at intervals to keep the cooling system be- tween 120 and 145 degrees Fahrenheit, regardless of the weather. This assures an in- stant start when the motorist returns, as well as immediate heat from the car heater. A thermostat connected to the cooling system constantly checks water temperature, closing contacts which oper- ate:the starter switch when the temperature drops below 120°. Automatically the throttle is opened just enough to give the maximum charging rate for the generator, and warm the engine. On the average car the motor will usually stand idle from 90 to: 95.per cent of the time, making the cost. of: fuel used less than two cents an hour. A cut-out switch attached to the gear shift lever. prevents starting of the motor if the èar:has been left in gear. It instantly shuts off the motor if the gear shift lever is shifted eut of the neutral position, thus preventing accidents and theft: The regular car starter button is not need- ed; for this new robot switch automatically starts the engine as soon as the ignition key is turned on. If stalled in traffic, the engine 54 AUTOMATIC CIRCUIT CONTROL TOINTAKE MANIFOLD ‘WATER OUTLET TIME SWITCH RESISTANCE CONTROL TIME SWITCH AUTOMATIC STARTING SWITCH Illustration shows hew control box is mounted on dash board under switch, and starting relay. Robot keeps engine temperature be- tween 120° and 145° Fahrenheit, with heater always warm, WATER INLET——___ p s ¥ TO GENERATOR CUTOUT Photo shows compactness of motor robot parts. ated by key, is fastened on instrument panel. of car. mounts on floor-board, hooks over gear-shift lever. Control box at left, heart of unit; mounts ‘anywhere on dash under hood, connects as shown. hood of car. Inside is cooling system thermostat, time MOTOR TEMPERATURE CONTROL UNIT MOTOR TCMPERATURE CONTROL UNIT SWITCH MAGNET CO}LS FOR TIME SWITCH CARBURETOR CONTROL, FASTENED TO GEAR ‘SHIFT LEVER GEAR SHIFT LEVER SWITCH AUTOMATIC SIGNAL LIGHT LOCK SWITCH CONNECTION FOR STARTING MOTOR TO IGNITION COIL, CONNECTION FOR BATTERY FASTENED TO TOE BOARD Lock switch ‘at right, oper- Cut-out switch (center) is re-started without touching a single lever. Should the car run out of gas or for any other reason refuse to start, an automatic cutout operates after a definite time inter- val to shut off the starter before the bat- tery is discharged. By slipping a length of flexible metal tub- ing over the exhaust pipe of the car, and running this outside, the motor robot may. be safely used in private garages. Often- times the carbon monoxide gas produced by the car will escape fast enough through a partly-opened garage window. Since most of the installation work in- volves only changes in the electrical wiring, the entire set-up is readily transferable from one car to another. Special fittings are avail-. able for each make of auto. Modern Mechanix and

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-MM'S Cover from Painting to Magazine Three photo negatives are made of 21x30" oil painting (below). At same time screen of 133 dots to inch is placed between plate and lens. On one negative all but blue color is filtered out, second all but red, and third yellow. Proof of type for the coveris photographed. Type on nega- tive is masked for drawing (above). George Rozen, MM’s cover artist, makes an outline of this month’s cover . from a sketch supplied by the editor. He makes a small color rough to get tone values, then completes oil painting. REGISTER MARKS Three color plates (left) each of which makes a separate color impression on finished cover are needed. Photo print is made on copper plate of type, over which red negative is superimposed for red plate. Plate is etched, acid eating metal where there is little or no red. Shading is obtained by varying size of screen dots. Use magnifying glass on cover to see these. Black is obtained by piling three colors on top of each other. Register marks line up plates for proofs. Electrotypes for presses are then made from lead mold of REGISTER à : SS r plates for the actual printing. MARKS i copper pia! p g Inventions, January, 1935 55

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ANALYZING HOCKEY- HIGH TRIP WITH STICK, Voss, of New York Rangers, outwits Toronto Maple Leaf defense to score a brilliant goal. Note cage construction. HUMAN speed reaches its athletic peak in the fastest game on earth—hockey. No other sport even remotely approaches it in tempo. For hockey is a game of human meteors on bladed lightning—a dazzling spectacle of split-second thrills, almost too fast for ordinary eyes to follow. Any hockey spectator knows that the object of the game.is to put the puck into the enemy’s goal. How ‘and why it gets there is generally a mystery to the un- initiated. With this in mind, we shall go behind the scenes and see just what it is that makes the game click. Hockey, of course, is played by six-man PENALTY BOX Drawing shows general. layout of hockey rink with positions of players at the face-off which begins each period. The insert of the skating figures shows three common fouls which cause removal from game for a given time. 56 Modern Mechanix and

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GFASTEST Game on Earth by JOHN C. HOFFMAN teams on sheets of ice commonly known as rinks. When games are played indoors— the general custom in the United States—the - measurements of the rink may be regulated by the size of the building; but in general the playing surface is 200 feet long and 85 feet wide. A wooden fence, 4% feet high and preferably white in color, surrounds the arena. The goals are located from 10 to 15 feet from the ends of the rink and in the center of a line drawn across the ice. The goal posts are set 6 feet apart with a red line— the official goal line—connecting them. Back of the goal line, of course, is a netted cage to catch the puck. The ice area between the two goals is divided into three sections by a blue strip extending across the rink, 60 feet out from ; : the goal lines. The center section is known a = ae , as the neutral zone and the end zones are zits Der E N to check ES A aelen variously known as “defensive” or “attacking” zones. The six men who comprise the team are known as goalie, cen- ter, left and right wings and (Continued on page 137) Right defense passes to right wing who skates across zone line and passes to center. Latter skates toward goal, suddenly passes to the left wing who has entered the end zone with puck move- ment—a typical pass play. Charlie Gardiner, late goalie of the Chicago Blackhawks, has just checked a vicious enemy drive, Arrow points E puck as it struck Gardiner’s body. Note heavy trappings necessary for protection against the mile-a-minute pucks. Inventions, January, 1935 57

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Scientist Builds 38-Foot Model Showing Moon’s Surface Roger Hayward (foreground) is shown at work on his model of the moon. In background another worker studies moon photographs through magnifying glass for proper contours. Gas Engine Powers Model Plane TRINGENT Department of Commerce regulations have grounded many ama- teur flyers; but Wallace McDowell, Los Angeles, California, has succeeded in put- ting a plane into the air which supplies most of the thrills of flying with none of its hazards. The ship is a combination job, too small for a passenger but considerably larger than the usual model plane. The craft measures 4 feet in length and has a wing spread of 5 feet. Power is supplied by a miniature gasoline motor which propels the tiny plane through the air at a speed of 25 m.p.h. for 12 minutes. The model weighs 3% pounds. Wallace McDowell makes mechanical adjustments on the motor of his model plane, preparatory to a takeoff. 58 REMARKABLE addition to the new Griffith Observatory in Los Angeles will be a 38-foot model of the moon constructed by Roger Hayward, architectural designer and prominent amateur astronomer. . Three and a half months were required to make the original model from which plaster molds were made, a section at a time. When these sections are joined and installed in the Observatory, the huge model will give the observer the illusion of looking down upon the moon from a space ship hovering about 600 feet above its surface. The model was built from Royal Astro- nomical Society data, supplemented by pic- tures made through the 100-inch Mt. Wilson telescope. English Improve Traffic Signals Closeup of English traffic signal which has only one main light. The smaller lights indicate the time elapsed since main signal changed. AILED as a vast improvement over the old systems, a new English traffic light has only one main signal for the alternate showings of red, green and amber. A series of four smaller lights is extinguished in rotation to show how much time has ex- pired since the last change of the main signal. Hand Lamp Has Twin Reflectors NE of the out- standing fea- tures of a new electric hand lamp is its two-reflector construction, af- fording a spot beam in front and a floodlight at the bottom. Either light is brought in- to instant use by. a flip of the conven- ient double-acting switch. Note twin bulbs, top and bottom, giving spot beam and floodlight. Modern Mechanix and

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Movie Filmed in Above-Ground ` Subway” LOWER END OF GANTRY AT SHORE -ENDA F FI NEL movie “East River.” Looking into tunnel tube from “shore-end”. Car lock is at right, entrance lock for workers at left; emergency lock for use when tunnel is flooded is seen at top. N FILMING “East River,” the first movie ever to show under-water tunnel con- struction scenes, a gigantic full-size replica of.an actual 17%4-foot diameter tunnel was erected above ground in Hollywood by Fox Studios. Though the “tunnel” itself is constructed of wood, the interior, perfect in every de- tail, gives the impression of a metal subway perhaps a hundred feet below the surface of the river. Regular equipment brought from New York tunnel jobs is used at the “working- end” of the movie tunnel, where powerful hydraulic rams push the cutting shield into Inventions, January, 1935 Sketch above shows how full-size replica of subway tunnel was constructed above ground for filming in Hollywood of Fox Inside of 171/-foot diam. tube resembles actual metal subway. : LENGTH OF TUNNEL 425 FEET PEMOVABLE SECTIONS LARANELING SUN-SHADE, : TRACK FOR MOVABLE. 2 SUN SHADE DARK ELOTH COVERING OVER FRAMING PLATFORM FOR = AMERA MEN SECTION SHOWING SUN-SHADE 2 OVER REMOVED. PORTON OF TUNNEL AND. METHOD. OBTAINING SCENES FROM ABOVE Working end of tunnel, with hydraulic rams which push cutting shield ahead showing just above platform. Equip- ment was brought directly from New York tunnel job. the river-bottom muck. The effect of water and mud oozing in between seams was obtained by spattering a special paint over the tunnel interior. In filming action scenes, sections of the tunnel were removed and a traveling sun- ` shade rolled into position, to get the proper focus for the cameras. 59

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Building Wor Photo shows one of four units which will pump 90,000,000 cu. yds. of earth into Fort Peck dam. Three other dredges are under construction, upper left. Smaller pontoons sup- port 154,000 volt power line from Great Falls, Montana. T a point in eastern Montana where crowding bluffs force the winding Mis- souri river through a natural bottleneck, army engineers are engaged in one of the most gigantic projects of modern times—the building of the Fort Peck Dam, largest earth fill barrier in the world. Not even Boulder Dam, Titan of the South- west, eclipses the Fort Peck structure for sheer magnitude. For when the massive earthen wall is completed, the rampaging Missouri will be held in check by a mighty barrier almost four miles long. From a sturdy base measuring 2677 feet from upstream to downstream toe, the twin slopes of the dam proper will rise 231 feet above the river bed to form the dam’s crest, 100 feet wide. Across the main channel, en- gineers are throwing a main fill 8500 feet wide, to join a low dam, or dike which will march 11,000 feet up the west bank, for a total length of 19,500 feet. . The most unusual feature of the $72,- 60 ’s Largest Four years hence this bridge will disappear as dam rises, filled by earth from a battery of 28-inch pipes as shown above. Map insert shows location of the mammoth project. 000,000 project is the choice of construction material. A 3-foot facing of concrete and rip-rap will protect the upstream slope, but the main body of the dam will be composed of earth fill—90,000,000 cubic yards of it, which will be pumped into position by a battery of dredges. Held in check by this mighty wall of earth and stone will be a giant reservoir, 175 miles long and 16 miles wide. This huge lake will flood a district of about 380 square miles—250,000 acres—to a maxi- mum depth of 230 feet. Boasting a shoreline of about 2500 miles, the Fort Peck reservoir will impound the staggering total of 20,- 000,000 acre feet of water, an amount which (Continued on page 140) Pe Modern Mechinix and

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= iS, 3 2 “MAIN: FILL a CROSS-SECTION OF- DIVERSION TUNNEL CONCRETE 7 QIN, Y | 26 FT É Pa STEEL TIN. GROUT -6 iN. CONCRETE ARINE 895 ET. % IN. Inventions, January, IMPOUNDED. WOULD TO THE 69-7. This cutaway view shows construction fea- tures of dam. Note that water is routed around the dam through four huge diversion tunnels. F ES FLO 20,000 MILE TRAIN tial-to Fort Peck -dam site. 9,000;000 tons of mate- Railroad will transport- ILD 110 WASH- MONUMENTS 1935 WATERS P MAKE RIVER” ON Some idea of the amount of water impounded by the dam is shown in the sketch above. 6l

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Sun’s aye Cfangre Into Electricity, Drive Small Motor

<= COATED METAL PLATES CURRENT== 4MILLIAMPERES

J. Thomas Rhamstine points out photo-electric plates used in his miniature solar power plant. Sun’s rays striking the 20 squares generate current of 4 milliamperes, enough to run the midget electric motor shown at right. Oxide coating on face of metal plate converts light to electricity. German Ship Is Spliced Together SHIP without bow or stern—just a cen- ter section—was launched in Germany recently, then floated into position between the old cut-off end sections of the 10,000 ton tanker Svithiod. This unusual ship-patching procedure was decided upon after investigation showed the center section of the Svithiod to be badly corroded, but the ends still in good condition. New and old sections of the ship were accurately aligned, then lifted entirely out of the water by a floating drydock and weld- ed together. First trials showed the splic- ing to be a decided success. With the same cngines, the speed was 11 knots an hour, an increase of 1% knots. HE scientific dream of some day obtain- ing power for industry from the sun finds realization in a miniature sun-power plant built by. J. Thomas Rhamstine, Detroit inventor. Whenever the sun’s rays strike a group of twenty. photo-sensitive plates, the tiny electric motor connected to these ‘spins merrily away, turned by electrical power. obtained directly from sunlight. With the series-parallel connection of oxide-coated plates a current of four milli- amperes is generated. Rhamstine estimates that a charging current of 18 amperes for a 32-volt farm lighting plant could be ob- tained with a ten-foot square area of the photo-electric cells. Harpoon Gun Spears Alligators

Harpoon gun just completed by C. R. Klein (above) wilt throw spear with line attached distance of 150 yards with surprising accuracy. Line is attached to salt-water rod and reel just back of gun, used in landing harpooned fish. HARPOON gun intended for the capture of sword fish, alligators, sharks and other large water denizens has just been completed by C. R. Klein, of Santa Monica,

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California. Operating from com- pressed air, the device can shoot the harpoon with line attached a distance of 150 yards. In emergencies the gun may be used by coast guard stations for firing life lines over the surf to disabled vessels. The range of fire may be accu- rately controlled by a pressure gauge and valve mounted on the gun. The line is coiled on a reel at the lower end of the firing cham- ber, its end being led to salt water rod and reel equipment used in playing and landing fish

New center for steamer “Svithiod” being floated into position between Parts were welded together after being lifted out of the water by a floating dry dock. old bow and otern sections at German shipyard. 62 after they are hit. The accuracy of the novel fish- ing gun is surprisingly good. Modern Mechanix and

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HOW HE MICROSCOPE DETECTS CRIME CLUES ty JULIAN | Dy CORRINGTON, Phl D. If two bullets show identical scratch pat- terns when studied in comparison micro- scope pictured above, police know they were fired from same gun. Projectiles are rotated in holders until im- ages, viewed simul- taneously and side by side by means of prisms, exactly match. Inventions, January, 1935 CIENCE’S gift to criminology, the modern high-power microscope, today permits positive identification of three types of clues —fingerprints, bullets and blood stains. Juries everywhere are basing their deci- sions upon evidence studied through the double-vision comparison microscope, con- victing criminals by clues which only a few years ago would have proved worthless. The tiny ridges covering the tips of our fingers, originally intended by nature to provide a non-slip grasp when man lived entirely by his hands, are arranged in so intricate and varied a pattern that no two people have ever been found with identical fingerprints. Each Fingerprint Has a Number Criminologists have classified fingerprint patterns into four main types and many sub- divisions, and have given each an arbitrary numerical designation. Each print can thus be described by a group of numbers, per- mitting rapid location of any fingerprint card in the enormous and elaborate files maintained at principal police headquar- ters. Since no two fingers on any person are alike, it is necessary, in making police rec- ords, to record the patterns on each. Spe- cial cards for this purpose contain spaces for each of the ten fingers. In taking a fingerprint impression for police records, the ball of the finger is first pressed on a stamp pad or inked glass plate, then placed, left side first, upon the proper space on the card. The finger is then rolled from left to right while pressing with mod- erate force. This act must be done in one rapid motion and the finger lifted straight up at the end, to prevent smudging. Study Fingerprints With Low-Power Microscope In examining fingerprints made in this fashion, the lowest power of magnification available on the microscope is used. Prints left on a smooth surface such as a micro- scope slide by the natural oil of the skin are made visible by dusting with fine powder such as talcum, rouge or lampblack. Each revolver or rifle barrel signs its own signature on every bullet fired. In a homi- cide case, if a bullet removed from the body of a victim is found to have a scratch pattern (Continued on page 124) l 63

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eeking SUNKEN GOLD by ALFRED ALBELLI Not on the Spanish Main, but only a short distance from New York’s Times Square three rival gangs are hunting for $5,000,000 in gold. Sunk during the Revolutionary War, the British frigate “Hussar” is the ob- ject of this treasure hunt in the East River. Here is the unusual submarine salvage ship ‘‘Laksco,’’ invented and designed by Simon Lake primarily for salvaging cargoes from sunken vessels, HEEE rival salvage gangs—modern treas- ure-hunters—are now engaged in a nip- and-tuck race to locate the sunken hulk of the British frigate Hussar which went to the bottom of the East River, Manhattan, with a $5,000,000 gold cargo on Nov. 23, 1780. This sensational treasure hunt is raging in a section which is only a five-cent sub- way fare from Broadway—and not on the Spanish Main where quests for sunken gold have held the glamor in past exploits. The Hussar reposes beneath the turbulent waters of Hell Gate in the East River. Hell Gate is the nickname given for this section of the water-way because of its perilous currents and treacherous whirlpools. Each year it claims a toll of at least 15 vessels. Some of the worst catastrophes in Manhat- tan’s maritime history have occurred in Hell Gate. The Hussar went down with 107 men on board. There were no survivors. The vast amount of gold coin was intended for the British army forces quartered near New York during the American Revolution. — 64 With it he hopes to find the $5,000,000 gold treasure lying on East River's bottom. In September, 1780, according to records in musty archives, the Hussar anchored alongside the H.M.S. Mercury off the Bronx shore. The Mercury had also been sent to pay off the British soldiers. As the Hussar was considered a more rugged craft, better qualified to weather the terrors of Hell Gate, as well as any traps set by the Colonial rebels, the Mercury transferred her treasure chests to the Hussar. In passing Point Morris, the Hussar struck the protruding Pot Rock, tore a huge hole in her bottom and started to fill rapidly. Instantly, the captain steered for shore. In the absence of beaching places, the skipper sent a line ashore by small boat. The line was firmly fastened to a tree at one end and to the sinking Hussar at the other. It was the captain’s plan to keep the Hussar floating in comparatively shallow water until the money could be taken ashore. But the rope snapped and the ship went down. It so happens that on this side of the river there is a shelf which runs along under the water, hewn out of the Modern Mechanix and

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15 Minutes from “Broadway SALVAGE SUBMARINE 122 FT. LONG island by nature. This-bar drops suddenly from 17 to 80 feet. Some of the navigators who have been trying to locate the Hussar believe that she went over this ledge and was dragged down- stream by the heavy tide eurrents, and then slid over another cliff and'went down to the bottom. Although the records have placed the Hussar’s hulk near Randall’s Island, be- tween 130th and 131st Streets, divers have not been able to find her. They have come Inventions, January, 1935 Left—How Lake’s |. salvage operates when seek- ing sunken wrecks. submarine Roy Hansen, noted diver, is. shown ‘being lowered into East River to continue search for the “Hussar”. His div- ing suit was designed for the treasure hunt. Map at left shows where the “Hussar” was wrecked. The hulk of the gold laden ship is believed to be off Randall Island. upon several other wrecks, however, but these derelicts carried trade cargoes of coal. and minerals—not gold. The Hussar has been worked for treasure ever since 1818. The crude and primitive diving equipment of those days prevented effective work in the surging tides of the roaring East Riverin the Hell Gate section. In 1819, the records of the present treasure- hunters further disclose, some of her guns and upper sheathing were brought up. These were retrieved, the records state, in a nest 30 feet below the bed of the river. There have been many attempts to sal- vage the Hussar in the past twenty years: This past summer, however, three expedi- tions got going with:a do-or-die determina- tion, and before the passage of another sum- (€ontinued on page 144) 65

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“Beauty Micrometer” Analyzes Facial Flaws for Makeup Max Factor, Hollywood makeup expert, demonstrates the “beauty micrometer” which analyzes actors’ facial flaws. Windmill Propels Pontoon Boat HE problem of.cheap transportation has been solved by an Oregon man who re- cently staged a successful demonstration of a home-made “windmill” boat. Twin wind- driven blades supply the power which is transmitted, via a small belt, to the. pro- peller. Two pontoons keep the craft on an even keel. Although somewhat crude in appearance, the windmill boat has proven to be unusual- ly sturdy and seaworthy. Photo shows wind-powered boat built by Oregon man. A pulley transmits power from the vane shaft to the propeller. 66 ECENTLY perfected by Max Factor, one of Hollywood’s most famous beauty ex- perts, a new instrument, designed to aid makeup men, accurately registers actors’ facial measurements and discloses. which features should be reduced or enhanced in the makeup process. ; Flaws almost invisible to the ordinary eye become glaring distortions when thrown upon the screen in highly magni-- fied images; but Factor’s “beauty microm- eter” reveals the defects. The device, remotely resembling a base- ball mask, fits over the head and face with flexible metal strips which conform closely to the various features. The strips are held in place by set screws, allowing for 325 possible adjustments. If, for instance, the - subject’s nose is slightly crooked—-so slight- ly, in fact, that it escapes ordinary observa- tion—the flaw is promptly detected by the instrument and corrective makeup is ap- plied by an experienced operator. School Trains Future Explorers L Instructors check navigation apparatus at explorers’ school. Note compass board and ship models used for sea problems. NE of the strangest schools in America is that of the Institute of Geographical Exploration at Harvard University. The Institute is the only school of its type in the country, devoted to the training of young men for the field of exploration. Here the lad with the urge to push back the frontiers of civilization learns the techni- cal requirements of the explorer’s trade. The students work both with practical in- struments and with scale models. Instruc- tion is given in the art of checking the accu- racy of a compass and similar navigation `- problems. Model ships are similarly used, : together with other marine equipment. Modern Mechanix and

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Novel “Bog Hopper” Harvests Hay on Soggy Ground ARMERS in Ottertail county, - Minnesota, have solved the problem of harvesting hay in marshy ground with a Ford- powered “bog hopper” which not only wades right in where horses fear to tread but, better yet, comes out again under its own power. Attached to each wheel of the ingenious machine is a half section of a 55-gallon steel drum strongly bolted in place. The back barrels are equipped with wooden lugs to provide traction. A Chevrolet shift af- fords a lower gear ratio and greater speed flexibility. Three extra bull wheels are attached to the mower to keep it from bogging down. An outlay of less than $5 was required for parts for the ma- chine, which was built in two days. With the use of the unique device between 7 and 8 acres of hay were harvested in one day with a five-foot mower. Water standing above ground failed to halt the machine. Battery Drives Odd Rescue Craft above. Top photo shows carriage for launching the rescue craft. Below—Device in the water. Note the towing handles. OWERED by an electric motor run by a 12-volt storage battery, a novel rescue craft enables life guards quickly to reach a drowning person. -Resembling a small boat cut through the the middle, the craft is equipped with handles to which the guard clings as he is towed through the water. The battery oper- ates a small propeller beneath the boat. Inventions, January, 1935 Hotses and ordinary farm equipment would be hopelessly mired in this soggy ground, but not the home-made “bog hopper” shown in the photo Steel drums bolted to the wheel rims keep machine from sinking. “Paddle” Plane Needs No Rudder N AIRPLANE that “paddles” its way through the air as a duck paddles through the water yet requires no rudder control is the Jatest aviation idea designed to eliminate large fields for landing and taking off. i The new ship, still in the experimental stage, resembles a motorbus body with an overhead wing and two sets of triple-bladed propellers at front and rear.: In each of the propeller hubs is a cam-and-shaft deyice which twists the blades as the hub revolves. With this arrangement the blades are turned to strike the air with their flat sides on the forward and downward stroke. On the upward stroke the blades are turned so ihat they cleave the air with their thin edges, thus reducing the air resistance to a minimum. With the blades set in the “paddle” posi- tion, the inventors hope to achieve a verti- cal climb and descent eliminating the ne- cessity of large takeoff or landing fields. The ship has no rudder. Steering control is effected by varying the speed of the twin sets of propellers. A cam-and-shaft arrangement in propeller hubs enables blades to be tilted at will of pilot. When striking aie flat, blades are said to effect vertical climb or descent. 67

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Modern Mechanix and Inventions Exclusive Photo The thrilling sound of sword or saber duets is simply the clash of knife and fork. Note idle rapiers of the players while the soundman at rear near the mike holds knife and fork ready. by W. L. COLLINS OW did the broadcasters ever teach a tree toad to emit its mournful cry—on cue—for that outdoor program you tuned in on last night? More than likely the tree toad was Ray Kelly, NBC sound technician, plus an ordinary comb! Mr. Kelly ran his fingers—with the proper pressure—over the teeth of the comb, and it was the cry of a tree toad to you! The continuity writers care little for the labors of the production department. If their imagination conjures up situations calling for footsteps in the mud, an arrow imbedding itself in the heart of a jungle savage, coffee boiling, bacon frying, a man’s head being split open with an ax, the writ- ers write merrily away and trust to the ingenuity of the technicians to imitate the sounds called for by the script. Naturally, some of these sounds must be faked; but, you say, why imitate common sounds such as a boiling coffee pot, for example? Why not put a pot of boiling coffee in front of the microphone and let it go at that? The process, unfortunately, is not quite that simple. Experience has taught sound 68 THE SECRETS Train effect gadgets: Left to right, large drum for chugging; motor-driven wind machine; grindstone for sand brakes; snare drum, distant chugging; air tank, exhaust; toy train under cone, clicking wheels. technicians that the microphone, the ether and your receiving set do queer things to sounds. By the time the bubbling of the coffee pot reaches your ears the sound resembles the roar of the surf. Hence Mr. Kelly and his assistants are not trying to fool you when they boil oil in the frying pan before the microphone and the actor remarks, “Ummmm, that coffee smells good.” They have to fool the “mike.” “Sounds don’t sound as they sound,” says Modern Mechanix and

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of RADIO'S 4 2 For programs with a medieval background, equipment above is used. Box-like affair at left imitates sound of heavy door, with latch for drawing of door bolt. On the floor are chains for sound of raising drawbridge. Man at right imi- tates sound of soldiers marching over wooden drawbridge. Mr. Kelly. “To simulate a rap on a window, for instance, the obvious thing is to rap on .window glass with the knuckles. But over the mike,” explains Mr. Kelly, “it sounds too thin. We tried tapping a pencil on glass, but it was too metallic. We tapped slate, books, walls, doors, with knuckles, pencils and xylophone sticks. Finally, by accident, one of the soundmen hit the triple- ply glass that separates the control booth from the studio and the rap went over the mike. Perfect!” When Amos ’n’ Andy first went on the Inventions, January, 1935 EXPERTS Modern Mechanix and Inventions Exclusive Photo In the exclusive picture shown above, NBC artists demonstrate a scene from an air thriller—a head-split- ting sequence. Note soundman about to bury hatchet in cabbage head. Circle left—Ray Kelly, technician, many of whose sound devices ate described in accompanying text. air with their OK Hotel, a real telephone switchboard was constructed for them at great expense. “It sounded like a house falling down when it came over the air in the rehearsal broadcasts,” Mr. Kelly reveals. Hence you never heard it. The sound en- gineers went into a huddle and when they came out of it they brought with them an ordinary cigar box with a buzzer and dry cell battery on the inside. This was the buzz of the switchboard. Atop the cigar box was a closet latch which produced the noise of a cord plug being plugged into the switchboard. The whole contrivance cost less than a dollar. The vibration sounds of the engines of a steamboat almost drove the engineers from their laboratory to sanitariums. But they finally emerged from what is probably the queerest laboratory in the world with a “dingus” to make a noise like the engine vibrations. It is very simple. A length of iron pipe is suspended from a support by a heavy spring. The pipe is given a tug and the tortional action of the spring comes over the ether as the vibrations of a steam- boat engine. Footsteps in the mud? Well, the “plum- ber’s friend” proves to be the sound en- gineer’s friend also. Working a sink plun- ger up and down in a box of wet bran (Continued on page 118) 69

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Ancient Mayan Throwing Stick Modernized by Bowmen. Mrs. Robert Stacy-Judd, wife of the famous archaeologist, demonstrates use of modernized version of the ancient Mayan throwing stick on a Los Angeles archery range. France Tests New “Cannon” Plane JJESIGNED to intercept fleets of enemy bombers and destroy them with power- ful shells, France’s new “cannon” plane, a heavy bomber equipped with a 75 milli- meter gun, has successfully passed its first test, according to recent dispatches from. the French capital. Mouth pointed out between the wing braces, the gun was fired from a porthole in the cabin of the plane. The gun was fired five times without causing undue vibration in the plane and its aim was said to þe accurate. Tests of the new plane were held above the Cazaux airport. Stand Holds Breakfast Newspaper ADE of heavy brass wire and ornamented with a copper rooster, a handy stand elimi- nates the difficul- ties of reading a paper at the break- fast table. The stand holds a fold- ed newspaper firmly in place or may be used equal- ly well as a rack for either books or magazines. This ornamental stand of brass wire holds the morning news- paper firmly in place at table. 70 ORROWING an idea from the Mayan Indians of Yucatan, Los Angeles sports enthusiasts have revived the ancient throw- ing stick to add new zest to the enjoyment of modern archery. Used instead of a bow to hurl arrows great distances with deadly accuracy, the throwing stick, or “hul-che,’ was used for both hunting and combat by the ancient Mayans. Several specimens of the weapon were found by Robert B. Stacy-Judd, fa- mous archaeologist, and were given to Earl B. Powell, nationally known archery ex- pert, who developed them as a modern sports accessory. Lamp in Knocker Lights Keyhole HE annoyance of fumbling in the dark for a key- hole laie at night has been over- come with a new door fitting. Hid- den in the ham- mer of a brass door knocker is a tiny bulb which throws light down- ward when knock- er is raised. Two small batteries furnish current. Photo shows how the knocker light illuminates the keyhole. Women Stars Wrestle Under Water NE of the world’s strangest athletic events was held recently when Dolly Dalton, Canadian champion, engaged Dixie Taylor, southern women’s champion, in an underwater wrestling match at Silver Springs, Florida. The remarkable clearness of the water enabled spectators to follow every move of the contestants. Good wind is essential for this strenuous sport. An action photo of the under-water wrestling match at Silver Springs, Florida. Note the fish in the foreground. Modern Mechanix and

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Solar “OIL STOVE” Heats Baking Oven SUN’S RAYS ARE FOCUSED ON COPPER TUBE IN VACUUM BY CYLINDRICAL a p VACUUM y- OIL- FILLED COPPER TUBE GLASS TUBE ys - ee iain MATERIAL RETURN. Photos and diagram above show how sun’s rays, focused upon oil-filled tube at point of vacuum enclosure cause oil to tise, throwing off 300 to 400 degrees of radiated heat in the oven, permitting baking of bread or broiling of bacon. B FOCUSING the sun’s rays upon an ingenious mechanical contrivance a California scientist has trapped sufficient solar heat for ordinary broiling and baking. Falling upon a glass-covered trough whose face is kept toward the sun by a clock mechanism, the sun’s rays are fo- cused by curvature of the trough upon an oil-filled copper tube. This tube is filled with heavy machine oil and is enclosed in a special glass tube, creating a vacuum. Heated by the focused solar rays, the oil rises and circulates around the sides of an oven, leaving from 300 to 400 degrees of heat. The cool oil then gravitates back into the trough again, automatically maintain- ing circulation. Lamp IIluminates Phone Dial EWEST of the telephone con- veniences is alight- ing device which illuminates the dial. Two flash- light batteries and the small bulb are contained in the compact case which fits either cradle or upright type phones. Am- ple light is fur- nished either for dialing or making memorandums be- side the telephone. 1935 Small bulb and flashlight bat- teries furnish fight for dial. Inventions, January, ‘Single Pedal Controls Tiny Car OMPLETE in all practical details, yet so small that it scoots easily beneath a horse, an English midget auto has made driving possible for anyone by eliminating clutch, brake pedals and gear shift lever. All motor control functions are centered in a single pedal. When this pedal is at full height, the brakes are automatically set hard. Brakes are released and engine accel- erated as this pedal is depressed. The tiny cars weigh about 200 pounds, average about 15 m.p.h. and travel about 70 miles to a gallon of gas. The 1 h.p. motor is rear mounted; and the entire rear assembly, including wheels and motor, may be re- moved in minute by unscrewing four nuts. Now in quantity production in England, this midget car averages about 15 m.p.h. and travels 70 miles to the gallon. 71

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Hand-Carved Model Reproduces Minn. Logging Scene Above is shown a faithful reproduction of a northern Minnesota logging camp in action, hand-carved by Oscar Stenberg, Minneapolis craftsman. Device Projects “Micro Movies” IVING specimens, as seen through a mi- croscope, may now be thrown upon a screen with a new micro projector especial- ly designed for the student of amateur microscopy. With the new instrument the microscope fan may satisfy a natural desire to show his friends what he sees in the microscope by projecting the object on a translucent screen through the aid of a powerful light and condenser. The projector operates on 110 volt, A. C. current only but may be used with any of the common types of micro- scope now on the market. Another feature of the new machine makes it valuable to the amateur student of microscopy. By clipping a mounted mirror to the eyepiece tube of the microscope, the image is thrown down on paper or note- book where it may be rapidly and accurate- ly traced. Mirror clipped to eyepiece tube throws image of specimen onto paper where it may be easily and accurately traced. 72 HE logging days which once made Minnesota famous live again in a remarkable model of a north woods logging scene recently completed by Oscar Stenberg, Minneapolis wood carver. Occupying an area of about 8 square feet, the model is hand-carved and required 3 years to build. Against a background of spruce and Norway pine, typi- cal of northern Minnesota, Stenberg has constructed a model showing the major woods operations. Teams are shown hauling the rough logs to askidway where men armed with peaveys and pike poles load the logs onto the waiting sleds. Another interesting feature of the model is a replica of the old water carts. This equipment was used to ice the run- ways over which the sleds traveled with their heavy loads. A combination of cotton and mica covers the ground like snow, adding the final realistic touch. ` Safety Bumper to Cut Accidents Photo shows safety bumper scooping up pedestrian. Note sturdy rail which provides band-hold until car is stopped. AY safety bumper which is expected to reduce the appalling number of in- juries which result when pedestrians are struck by moving motor cars was recently demonstrated to delegates attending the convention of the International Association of Police Chiefs. í Resembling a huge metal grid, the safety bumper folds flat against the front of the car under normal operation. When engaged by an object or person, however, the grid drops, slanting downward at an angle which enables the device to scoop up the pedestrian. Modern Mechanix and

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RACING CAR TIRES Need No Air Nic Sprank in ODDITIES of SCIENCE AT IS IT ¢- Mie Bu the broad brll and webbed feel of aduch, the Hick tir al a beaver y a ge ig eel ay ES 7 zs e ega LIV Tie latypus. > ae w A ar Duck ‘has ior oe ” Yeats puzzled zoog- EE, Wie Bane Š yA Livers Of Australia ad, og! Tasmania. — MILK IS SOLD IN SHEETS! J Dairy fàr mers izi Denmark ay fheir rille iher COMMS it ito Sheets, Tne dehydrated milk is restored to [rouwid frm W dissolving in hot water. — Karl Puesctel, Holyoke} fas yyy’ RACING CARS NEED NO AIR IN THEIR If a TIRES!—Az speeds of 200 miles an We : kourand over certiifugal Lorce a HE FURNACE IS THE SA (eal) iA = i FE ST PLACE DURING A LECOMCS. SLIONS CROUJA LO keep the Z THUNDERSTORM! — 74e Cast iron framework a£ tires inflated F Spon ls @ blow the “furnace Will carry Lhe Liphining bolt safely Out-Marsaret Ditven Tarboro, MC. P BE around a person to the ground Doyle peckateyey Paloka, Il. Win $1! Send your Oddity of Science to Nic Sprank, Modern Mechanix and Inventions, 529 South 7th Street, Min- neapolis. No Oddity will be considered unless source or proof of item is included. Do not include Oddities with letters. Inventions, January, 1935 72

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RIDING the SKYWAYS Mel Swanson’s famous group of flying stars in the shadow of the tri-motor. Left to right: Billy Morgan, Paul De Weiss, Mel Swanson, Virginia Whittlesey and the late Jerry Wess- ling, killed making a delayed chute jump at Floyd Bennett field just before he was to have rejoined Swanson’s flying troupe as a parachute jumper for the 1934 summer season. TRIVING for points of vantage, the crowd masses against the guard rail at the air- port. Quickening curiosity marks every face. An air of expectancy hangs over the field. Even the local pilots have shut off their motors. America’s ace barnstorming outfit is going into action. Mel Swanson and his Flying Stars are playing the field. High in the sky—10,000 feet up—a man suddenly bails out of an airplane. A streak of white trails him as he drops, hurtling to- ward the crowd at the airport ramp. On the field a tarpaulin has been spread for a land- ing target. “PIL bet anybody in the crowd five bucks that he lands withing fifty feet of the tarp!” barks a man with a megaphone. There are no takers. The crowd has learned from experience that Mel Swanson’s parachute men are among the best in the business. The daring stunt man hurtles earthward. At a thousand feet—maybe five hundred— he pulls the ripcord. Snap! And the parachute whips to a mushroom. 74 Photo shows a modern barnstorming troupe—Mel Swanson’s tri-motor, the sound car and stunt plane, a Waco J-6. This all-star outfit is known at airports from coast to coast. Then he flies the chute in toward the mark, not knowing how many dollars his chief may have placed on him; but seldom has he failed to hit terra firma more than an arm’s reach from the tarp. The cheers of the crowd have scarcely died away when the plane from which the stunt artist has leaped suddenly goes stark wild, like a thing flown by a demon. Screaming chandelles, loops over and under, everything in the book from Immel- mans to whipstalls are performed with such rapidity that spectators wonder what sort of flying fiend is at the stick. With a final screaming dive that grips the stomachs of the spectators, the ship comes into the field. It taxies to the line and out steps little Virginia Whittlesey, age 24, America’s premier woman stunt pilot. She is another member of Swanson’s all- star cast. Tricks of the Barnstorming Trade What is this, you ask—a major air show? The answer is “No, just part of the daily program with a modern barnstorming out- fit.” By means of stunts like these, coupled with a keen knowledge of crowd psychol- ogy and sales ballyhoo, Mel Swanson, pre- mier barnstormer, has built up a record of having flown more than 310,000 people—a greater number than any other man in the world. The stunts are a necessary part of Swanson’s program. : The barnstorming business has changed since the old days: when pilots hedge- hopped from one cabbage paich to another in antiquated Jennies, hoping to pick up an occasional five dollar bill. Delayed parachute leaps, autogyro stunting, aerial acrobatics and unbelievably large and in- terested crowds—these form the modern barnstorming picture in which chain store methods have capitalized the human urge to fly. Modern Mechanix and

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With Modern Barnstormers WESTON FARMER Yesterday the barn- stormer flew his old Jenny from one cab- bage patch to another, seeking scattered fares; today crowds throng airport. ramps to ride his powerful tri-motor. “Weve had to marry Barnum and Bailey to the airplane,’ chuckled Mel as we watched Billy Morgan, Paul De Weiss and Sergt. Richter hop aloft with record crowds. “Six years of big league barnstorming have changed the old time picture a lot. We’ve modernized everything, and this law of averages the chain stores use has taught us alot about selling rides to the flying public.” On this knowledge Mel has built what is probably the best known of nine high pow- (Continued on page 122) When crowds begin to grow restive and business slacks off, the modern barnstormer cuts loose with parachute jumps and stunt flying to hold attention. Small towns, like that directly above, once popular, are now shunned by operators who have made a business of barnstorming. Inventions, January, 1935 75

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London WRECKERS Slice WATERLOO BRIDGE GANTRY STRUCTURE DOTTED LINES Beds of clay just above arches of Waterloo bridge have, after 123 years, become hard as iron and difficult to remove. ATERLOO Bridge, London’s poetic “Bridge of Sighs,” is doomed! In one of the most difficult of modern-day wreck- ing attempts the massive granite arches are being taken down slice by slice, and tempo- rary steel trusses erected to replace every stone which is removed. This elaborate wrecking procedure is necessary since each arch is dependent for support upon all of the others. With ordi- nary wrecking methods, the entire bridge would crumble into the river, blocking the heavy river traffic if one arch wereremoved. A huge gantry structure is being erected over the entire bridge, with foundations resting on the piers, to remove the heavy granite bridge blocks and bring the tempo- rary steelwork into position. Starting at the -center of the bridge, traveling gantry der- ricks will jerk out slices stone by stone. 76 Huge gantry structure and trusses above are used in slicing the bridge. _TRAVELIN ANTRY- arch -supporting TEMPORARY STEEL BRIDGE Coping stones weighing one ton each are removed from parapet of Waterloo bridge by derricks.. Arches are being taken apart in lengthwise slices, because of thrust of one arch against another. Wrecking will take over 18 months. Modern Mechanix and

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Stunt Artist Broadcasts Feelings During Parachute Jump At the thrills of parachute jumping with none of its perils were recently ex- perienced by spectators and radio listeners when Maximilian Skupin, stunt artist, broadcast his sensations while falling through space over the-airport at Staaken; Germany. l l In one hand Skupin held a short wave antenna composed of three metal blades criss-crossed to form a hexagon. Around his waist were strapped two carrying cases containing the transmitter and batteries. A small microphone similar to the mouthpiece used by switchboard operators was sus- pended just below his mouth. Skupin’s body served as a counterpoise, or ground, for the unique experiment. Craftsman Builds Steamer Model More than six years of part-time work were required to build this model steamer, product of a Minneapolis man. ERFECTLY scaled, down to the smallest detail, a beautiful model of the pleasure steamer, “Midnight Sun,” was recently com- pleted by H. H. Flescher, Minneapolis craftsman, after more than six years’ spare time work. Seven feet long, the craft is lighted by electricity and carries eight life- boats. More than 200 people are shown in action poses, including a ship’s orchestra playing on the sun deck. Easy Pressure Opens Lamp Guard NEW quick- opening lamp guard simplifies the task of chang- ing bulbs in ex- tensions and sim- ilar fixtures. Out- ‘ward pressure on loops at end of guard causes them to swing open. Squeezing opposite loops together closes the guard. Note easy action of the improved wire lamp guard shown in photos. Inventions, January, 1935 Photo shows Skupin : prior to his parachute broadcast. Note short wave antenna he ishold. | ing in his right hand. { Construct Fire Engine From Junk | Whee eae to pay several thousand dol- lars for rural fire fighting equipment, citizens of the Wilton district, near Sacra- mento, California, pooled their mechanical resources and built a fire engine from scrap parts and salvage from junk piles at a cost - of only $47.41, The problem of transporting water tanks and equipment was speedily solved by the acquisition of an old truck which had been . discarded as junk. A small cash outlay plus a little garage work put it in running order. A discarded 500-gallon water tank and an old two-man pressure pump were found and were likewise reconditioned and placed on the truck after a small amount of labor had put them in efficient running order. A place was provided for two additional 40-gallon water tanks for bucket use, plus racks for extinguishers, brooms, rakes, axes and other accessories. All of this equip- ment has been installed on the $47 fire engine, whose accomplishments are said to equal those of machines ranging up to $4,000 in cost. A little labor and $47.41 in cash built this home-made fire engine near Sacramento, California. The truck, water tanks, pump and tools were salvaged from the junk pile. TI

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ie aes Rat Shoots Self and Photographs the Fatal Event > TRING - TO ELAS HLIGH SW EHS CAMERA Copyright, G. W. Fenner. Photo shows ingenious trap in which rat shot and photographed himself. Note how rat’s pulling upon the bait tripped the gun trigger. The bullet then cut the string, as indicated, to set off the flashlight charge. Photocell Is Lightning Arrester HEN lightning strikes radio station WLW’s 831-foot antenna tower, thus grounding the entire transmitter, a photo- cell trained on a discharge gap at the foot of the tower catches the flash. Complicated relay mechanisms and cir- cuit breakers respond to the electric eye’s danger call, and shut off the transmitter’s power for a split second to extinguish the “power follow-up arc.’ Were’ this not eliminated, virtually all of the station’s 500,000 watts of power would drain from the tower into the earth. The station is off the air for so short an interval that radio listeners never know just when their program is being interrupt- ed by lightning. Day and night this light- sensitive mechanism stands guard, keeping radio “on the air.” BASE _* INSULATOR Photo shows power arc flashing from insulated radio tower to ground. The relays are at right. 78 RAPPED in an ingenious contrivance built by George W. Fenner, Syracuse photog- ‘rapher, a hungry rat shot him- self and left a picture of the event in a camera trained upon the device. A piece of bait was suspend- ed from a wire at one end of the trap. Nibbling eagerly at the bait, the rat released a catch which dropped a spring-oper- ated hammer, tripping the trig- ger of a revolver mounted at the opposite end of the trap. The shot not only killed the rat but also cut a piece of string connected with still another spring. The latter set off a flashlight, sup- plying the illumination necessary to take the picture. In addition to the camera and lethal apparatus, a watch hung near the gun recorded the time of shooting. New Liner Boasts Mammoth Range The huge electric range recently installed in the French liner, Normandie, accommodates 35 workmen along its side. NE of the world’s largest electric ranges was recently installed in the vast kitchen of the giant French liner, Normandie, now nearing completion at St. Nazaire. The stove is large enough to permit thirty-five men to stand along one of its huge sides without crowding. Lighter Operates Without Flame FIRE without a flame is a novel feature of a new cigaret lighter. A single motion is said to produce a spark which turns into a deep red glow. The case is made of molded bakelite and is fit- ted with a chrom- ium plated device forscratching. The lighter performs well in a wind. A single motion produces a glow but not a flame in this lighter. Note convenient size. Modern Mechanix and

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UNDER-SEA Gractor-SPHERE FLOOR ROAMS OCEAN Artist’s drawings of tractor-sphere proposed by Otis Barton, designer of Beebe bathysphere. At left emergency buoy has been released, carrying air lines and guide cables to sur- face. At right chains have been lowered for hoisting sphere. EWEST of mechanical monsters intend- ed for under-sea exploration is the tractor-sphere being designed by Otis Bar- ton, builder of the bathysphere used by Dr. William Beebe in setting a new world’s diving record of 3028 feet. The new invention, intended to be driven into the sea from the beach level under its own power, might be classed as a bathy- sphere mounted on caterpillar treads. Pow- erful electric motors operating from sealed- in storage batterics would move this under- sea tractor over the rocky slopes and pin- nacles of the ocean floor. Under ordinary conditions there would be no contact with vessels at the surface as the tractor-sphere roamed about the ocean bottom. In case of emergencies such as engine failure a Jarge buoy would be re- leased, carrying airlines to the surface. Hoisting cables could then be slipped down the guide cables to the automatic chain- coupling devices on the sphere itself. Sphere, tractor, and all would then be hauled on board the ship for repairs. Where oceanic explorations are to be made some distance from shore, ships Inventions, January, 1935 MOVEABLE STEEL CABLE ON POWER WINCH SEARCHLIGHT ; ee AUTOMATIC COUPLING | DEVICE PERMITS CHAIN | OR HEAVIER CABE “TO BE REELED IN AND SECURED FOR HOISTING IN CASE AIR PURIFIE Cross-section of tractor-sphere shows arrangement of in- terior, location of motors, emergéncy buoy, and cable reel. would carry the tractor-sphere to the select- ed location, lower it to the bottom, then release the chains to permit unhampered exploration. Short wave radio would then keep the explorers in constant communica- tion with those aboard the ship, and the buoy released with completion of the work. 79

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THE history of the new national sport of -skeet is a record of amazing progress. From its inception in 1920 on the grounds of the Glen Rock Kennels in Andover, Mass., clubs have sprung up all over the United States. Today, one will find skeet being shot even in the smallest of hamlets. Skeet, which gets its name from an old Scandinavian form of the word “shoot,” has already gone far beyond its sponsors’ LEAD UNDER Skeet will improve your marksmanship, The speed and angle of targets resemble field conditions, For Thrilling SPORT by CAPT. W. H. FAWCETT Noted Publisher, Sportsman, Manager and Member of 1924 Champion American Olympic Trapshooting Team expectations. There are several reasons for this, mainly, because the average hunter wanted some form of wing shooting to test his skill and, incidentally, afford practice during the off months when he, or she, wasn’t allowed by law to hunt game. The factor of chance and ego also play a large part in the popularity of this new and ex- citing sport. We glean from the Official Skeet Rule and Handbook published by the National Skeet Shooting Association, Inc., of Boston, Mass., the following interesting facts. Safety is the first and greatest considera- In laying out the field first drive the stakes AC 40 yards apart. With B as center draw a semi- circle. Then mark off eight stations. Here is the general layout of a skeet field. The blind- ers prevent shattering targets from striking the marksman. The opening ‘in No. 7 trap house should be less than three ft. above the ground. The opening in No. 1 is 10 ft. 80 Modern Mechanix and

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Lay out a skeet field and try this fascinat- ing shooting game. You will forget golf, bridge, and meals attempting to chalk up a better score. Here are good pointers from an outstanding leader in the sport. tion when choosing a skeet field. There- fore, a liberal allowance should be granted for the range of the guns. It is estimated that the danger zone measures 300x600 yards so that your field should be consid- erably larger than this area. Laying Out the Skeet Field A skeet target, similar to those thrown in the companion sport of trapshooting, is smaller and, consequently, harder to hit than a game bird flying at equal speed. For this reason, it is advisable to have a clear sky background. In laying out the field, drive two stakes 40 yards apart, as shown in diagram labeled AC. The line that connects these stakes should run northwest by southwest as, or- dinarily, the light is better when shooting toward the northeast. Stake B should be (Continued on page 130) y Above two good skeet positions are shown. Don’t lean over on your stock, but stand with the shoulders leaning forward.. Keep head in vertical position. Above are the relative shot patterns of different gauge guns. Proper leads are given below. Two singles are first shot from 8 stations, then 4 sets of doubles from 1, 2, 6, and 7 and an optional shot, “SNAP SHOT. JUST COVER MARK OUTGOER - AHEAD AND UNDER. OU TGOER—- ASED AHEAD AND OVER. INCOMER~LEAD TER HR eee INCOMER-LEADS LATERAL AND DECREASED SIRDS Rist LATERAL AND" UPWARD DOWNWARD AND FASTER FROM dbase UPWARD LEADS LOW TRAP Inventions, January, 1935 81

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+ \ Advantages of .22 Rifles for Hunting Run If possible clean rifle from breech as shown here. water soaked flannels through first, then dry and follow with oiled flannels. Grease gun until ready to be used. HE .22 caliber rifle in its many patterns and makes is one of the most popular guns in North America. All other makes of guns in the world could not begin to come up to the total number of these popu- lar small bore rifles now in use. Undoubtedly when the .22 caliber rifle was first made in this country it was con- sidered as fitted for the boy only. However, its popularity grew rapidly among adult hunters as well as boy hunters. As a result the gun makers set about perfecting the gun and the demand for the .22 increased. Today we have guns in this class that are far more accurate and powerful than the .22 of the past. At the present time the .22 brass cartridge case has been perfected to the point where a pressure of upwards of 24,000 pounds to the square inch may be exerted. The .22 long rifle cartridge, loaded with modern smokeless powder, has a muzzle velocity of well over 1000 feet per second, and will carry up to 1400 yards. This cartridge is accurate up to 200 yards and close in the bullet will go through five pine boards. 82 by ROBERT PAGE LINCOLN There are three varieties of .22 cartridge, the Short, the Long and the Long Rifle. The .22 Short cartridge is the one most consistently in use. Since it is accurate up to 25 yards or more it is ideal for squir- rels, rabbits and other game that may be shot within comparatively close range. It is more nearly the kind of ammunition the boy should use, especially in well settled sections. -At that, the extreme, uninterrupt- ed range of the .22 Short is 1000 yards. It has been stated that .22 Long is likely to become obsolete, with the Long Rifle tak- ing its place. The .22 Long Rifle cartridge is used extensively in target work. It is con- sidered one of the best vermin cartridges, especially when hollow point bullets are used. Many men in the woods are using the hollow point .22 L. R. cartridge in killing deer, a practice that is not to be commend- ed, although if a vital spot is reached this bullet will down a deer with ease. The trouble with using the .22 on big game is that it often cruelly wounds the animal, leaving him to suffer for days. Greased or Greaseless Bullets? Shoot the kind. of shell your gun calls for. It should be understood that these guns are chambered to take the .22 Short, the .22 Long or the .22 Long Rifle cartridge, and as they are chambered, for that one cartridge and that only they should be used. To attempt to use the wrong cartridge may lead to damaging the rifling and injuring the accuracy. of the rifle. Whether greased or greaseless bullets are best to use in the .22 is a subject of con- tention. Some claim the greased bullet pro- longs the life of the barrel because of the grease protection. This may be true, but the practice of dumping greased bullets into hunting coat pockets, there to gather dirt, dust and lint, and then shoving them into the gun uncleaned, is certainly far from beneficial. As opposed to this the dry, un- greased shells may be kept in the pocket without encountering such conditions. To properly clean your rifle use the new water method. Run a flannel patch that has (Continued on page 127) Modern Mechanix and

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CAMPFIRE | Try a Small by PAUL W. GARTNER a, Z aN ils SICKLE-LIKE fin knifes through the . bounding surface of the ocean. Ex- perienced eyes identify a marlin swordfish, the prince of big game fishes. A small boat, powered by an outboard motor, cautiously circles the finned giant, as he lazily cruises about the sun-warmed surface. Two eager fishermen drop their baits to troll them across the path of the marlin. But will the sea titan strike? : : Breathless moments, and the long shadow of purple and silver darts toward one of the skittering baits. He grabs the lure and whirls away, as the free spool of the angler’s reel quickly and silently rips off line. Tensed and excited, the man can hardly resist the temptation to strike, but he knows he must wait until the game has swallowed the bait fish. - Inventions, January, 1935 Boat for Big Fish . For real fishing thrills wrestle swordfish and sea bass from an outboard motor boat. When the sea giant strikes, a battle, often lasting houts, begins. Some anglers take 150-lb. fish on six-ounce rods. Cruisers and yachts are not necessary for big game fish- ing. Boats 16 to 20 ft. long powered by ‘outboards make the sport more thrill- ing. bove is an 18-ft. skiff. Below a marlin swordfish leaping, trying to shake loose the hook. They often leap 10 ft. in theair. Now the marlin pauses, but in a second opens up with a terrific run. The stout rod whips upward, and for an instant there is severe tension on rod and line. The battle has begun. A dozen times the marlin rises vibrantly above the rolling blue, while the angler realizes a thrill which many claim is unexcelled in any other field of sport. Such is big game fishing as it is practiced from small craft in southern California wa- ters. Swordfishing is no longer a sport to be (Continued on page 127) 83.

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America’s Largest Electric Hotbed Controls Plant Growth L Second largest electric hotbed in world, at St. Louis, Mo., contains 30 beds each 6’x48’ in size. In one year $25,000 worth of produce was obtained from plants started here. Cream Siphon Is Seif-Starting ICH top cream pours out through a new self-starting milk bottlesiphon afew seconds after the tube is lowered, and continues to flow until the av- erage cream depth of pasteurized milk is reached. Air trapped by cream entering through two holes in the tube starts the siphon action. Simple new cream-draining tube depends on trapped air for starting of siphon action. GIGANTIC electric hotbed, started in St. Louis by relief agencies, has grown into what is now the second largest unit of its kind in the world. Only one hotbed, and that in Soviet Russia, surpasses if in size. One-inch thick lead cable is zig-zagged through the ground, six inches below the surface. Current travels through asbestos- | covered nichrome resistance wire inside the lead sheath, providing heat for seedling plants of all kinds. A separate electrical con- trol box is provided for each series of beds, since different plants require different tem- peratures. Mechanical Pencil Holds Lighter L Flame of new cigarette lighter appears automatically as unit is withdrawn from end of novel mechanical pencil. FFICE smokers who reach for a light as often as a pencil will welcome a new mechanical pencil which holds a lighter in one end. Pulling out this‘end with a slight twist provides the light. The flame is put out by simply pushing the cylinder back into the pencil. “Undentable_ Man” Stops Stes Cannon Ball With His Aak GAINST the Teali tone _of: Frank A. Richards, Los Angeles stunt artist, a million fists; battering rams-and sledge hammers have pounded to win him the title of the “undent- able man.” Recently, while seeking new punches to conquer, he faced a loaded cannon. The gun roared —the shot flew from its mouth —and Richards, struck square- ly in the solar plexus, bounced back into a net and out again, somewhat breathless but other- wise unscathed and triumph- ant. 84 Unusual action snapshot shows Frank Richards, “undentable man” of Los An- geles, being thrown into net by impact of shot: fired from giant cannon. He- bounced back breathless but unharmed. Modern Mechanix and

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Army Radio Simplifies Field Communication Problems ELEPHONE squads and dis- patch bearers may be elimi- nated from the army’s system of field communication in the fu- ture with the perfection of anew portable radio set. The equipment was recently displayed to visitors at the 1934 Radio Show in Madison Square Garden. The set is a compact unit, consisting of an ultra-high- frequency receiver and trans- ‘Initter. Operating on an extremely short wave length of approxi- mately six meters, the range of the set is limited by the contours of the country since the straight-line waves cannot surmount natural obstacles of any great height. The set is entirely self-con- tained and operates on dry batteries. action, Plane Collects Air Impurities A closeup of the air-collecting device is shown attached to side of cockpit. Specimens are taken at various heights. S THE first step in a five-year program devoted to the study of air impurities and their effect upon the health of city in- habitants, the Philadelphia College of Phar- macy and Science is enlisting the aid of air- planes to collect samples of air. A collec- tion tube through which the air passes is attached to the side of the plane. Samples of the atmospheric solid matter are taken at successive 250-foot levels up to an alti- tude of 2500 feet to determine presence of pollen and foreign elements. inventions, January, 1935 Photo at left shows the army’s new short wave transmitter-receiver in At right, how the set is carried in the field, Note the com- pactness of the complete unit which weighs approximately 25 pounds. Second Dog Is Restored to Life OBERT E. CORNISH, California biolo- gist, who amazed the scientific world last spring by reviving a dog clinically put to death (MopERN MECHANIX AND INVEN- TIONS, July, 1934) recently repeated the suc- cess of his original experiment with even more encouraging results. Lazarus IV, subject of the first successful experiment, has learned to crawl, bark, sit up on its haunches and consume nearly a pound of meat a day. The dog is blind and cannot stand alone, but results encouraged Dr. Cornish to launch a new series of ex- periments. Recently Lazarus V was put to death with an overdose of ether. Half an hour after its breathing had stopped and five minutes after its heart was stilled, the animal was revived by means of chemicals and artifi- cial respiration. Dr. Cornish, enthusiastic, has been reported as saying that Lazarus V returned nearer normalcy in four days than the other Lazarus in thirteen days. Dr. Robert E. Cornish, California biologist, is holding Lazarus IV and looking at Lazarus V. Both dogs were re- stored to life after they were clinically put to death. 85

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Frenchman Crosses Channel With Odd Paddle Device Charles Flourons, left, is congratulated for his success- ful crossing of the Channel. Note hydrosphere device. Fire Extinguisher Sold in Tubes NE of the newest protective devices for the home now on the market is a handy, quick-acting fire extinguisher which is re- tailed in tubes similar to those containing toothpaste. The device is not intended to substitute for the fire department, but is said to be effective as an emergency aid in quelling a small blaze. The tube extin- guisher is simple in operation. A screweye in the cap is turned in as far as it will go and then removed. Held in the hand, tube is squeezed to release a chemi- cal which creates a blanket of gas and smothers the flame. The device is said to be un- usually effective as an emergency measure and retails at a surprisingly low sum. 86 E After screweye is turned in- ward and removed, the tube is squeezed to release chemicals. Pecks ling himself through the water by means of a novel paddle device known as a hydrosphere, Charles Flourons, Paris, France, successfully crossed the English Channel from Cape Griz-Nez to Dover. Flourons’ hydrosphere consists of a ball one foot in diameter with a double-ended paddle, five feet long, passing through the center, The ball provides buoyancy and the paddles. furnish necessary locomotion through the water. Flourons operates the device by lying on his back in the water and turning the paddle with his hands. The trip was made in about 10% hours. Flourons left Cape Griz-Nez at 10:30 p.m. and landed at Dover about 8:45 the following morning. Cigaret Tray Has Wire Screen URNED table covers are said to be a thing of the past with a new wire-covered ash tray. Cigarets on screen cannot roll off onto table, but burn and drop through to tray. Cigarets drop through screen instead of falling on the table. Builds Playhouse From Oil Cans B! SOLDERING together 1500 quart oil cans, Edgar Speer, Ohio mechanic, has constructed a novel playhouse for his small daughter, By laying the soldered cans on their long axis and offsetting each course at the end, Speer has achieved a log cabin effect. Large enough to accommodate three or four full grown men, the cabin is 6% feet long, 4% feet wide and 6% feet high. The project took about 2% months of Speer’s spare time. The work was done with a common blow torch and soldering iron. Photo shows the novel playhouse, constructed of 1500 qt. oil cans, made by an Ohio mechanic for his daughter. Modern Mechanix and

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NEED FLAT. RON- HANDLE. WHICH WILL: REMAIN COOL IMPLE CUTTIN DEVICE FOR. ADHESIVE -TAPE Who can develop the ideas shown here? A for- tune awaits the man who can solve these prob- lems. Patent information can be obtained from the Patent Editor, Modern Mechanix and In- ventions, 529.S. Seventh St., Minneapolis, Minn. ISE inventors everywhere are working overtime scheming and planning new articles that will catch the public fancy and manufacturers are busy scouting around for all sorts of new gadgets to put on the mar- ket. Both the inventors and manufacturers are preparing for another era of prosperity. Those who bave attempted to tear a piece of adhesive tape will appreciate the fact that the metal containers in which this material is sold are more or less incomplete. The inventor who can devise some sort of a cutting edge built in inexpensively to cut the tape without the use of scissors should be able to earn a good income. Where is the inventor who can make an attachment that will change an ordinary chair into a baby high-chair? Such a chair would cost less than half the price of a high-chair and if it could be made of pressed metal, many thousands would be sold. Mother, laboring in the kitchen, has had many improvements offered to her during the past few years, but she is still looking for areally reliable and sure fruit jar opener that will always work. It MUST be cheap Inventions, January, 1935 FRUIT JARS and if it could be sold for a dime, a million could be disposed of within a short time. Ever since housekeeping emerged from the back woods, there has been a crying need for a flat iron handle that would re- main comfortably cool and still the solution is not in sight. Such an invention should be worth a small fortune. Problems, problems every- where we turn if we are at all alert. Invention, after all, lies largely in the recognition of hu- man need. Shaving creams of all sorts have been sold in collapsible tubes for a number of years but where is the simple attachment that will permit the shaver to spread a thin, even layer of this cream over the face directly from the tube? We still have to place it on the fingers and rub it on thereby wasting a large portion of it on the hands and fingers where it does not belong. Kids who own tricycles could well use a simple little pressed metal seat that could be attached to the back like a rumble on (Continued on page 142) 87

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Germans Seek to Control Speeds With Sliding Wing Plane Greater speed and maneuverability are possible in this German plane with the sliding wing section shown above. Near-Diamonds From Eyewash EAR-DIAMONDS, made from crystals of boric acid, or common eyewash, have recently been perfected by chemical ex- perimenters. The crystals are black and unsuited for gems but are said to be the hardest material ever created by man. Their degree of hardness is less than that of dia- monds but are said to surpass some of the commercial abrasives. The near-diamonds were made in a special furnace at about 5000 degrees Fahrenheit. Drive Meter Aids Golf Practice AILED as a boon to golfers is a new device which permits home practice during both the summer and winter sea- sons. An ordinary golf ball is secured to a cable attached to a metal balance weight. When the ball is struck a spring takes up the shock of impact, allowing ball to travel smoothly around a 15 foot circle. Each revolution registers 5 yards on a dial. The device is anchored by a heavy metal plate whose weight prevents capsizing when the ball is struck. Provision is also made for clamping down the device if desired. Practice with the de- vice shown here is said to “groove” the swing and to provide an accurate check on the length of drives. Ball travels in a 15-ft. circle when struck. The yardage is meas- ured on a special re- cording dial device, QNE of the highlights of a recent aviation meet at Warsaw was a German mono- plane with a low-slung wing which literally shrinks in flight. The wing is in two sec- tions, permitting the rear section to slide under the wing proper. By thus cutting down or increasing the wing area, flying speeds are raised and landing speeds low- ered at pilot’s will. Mower Guard Saves Nesting Birds Chains dragging through field in front of mower flush field birds. Operator then raises sickles to save nests. ESTING in the fields during haying and harvest time, thousands of birds are de- stroyed annually by the sharp-bladed knives of mowing machines and grain binders. With a simple device recommended by the Bureau of Biological Survey, a large part of this wholesale destruction is expected to be averted. The equipment consists merely of a light strip of wood, known as a “flushing bar,” which is attached to the tongue of the ma- chine directly in front of the horses. From this bar a series of chains are suspended which drag through the hay or grain in ad- vance of the mower’s path. The noise made by the chains flushes the mother bird, en- abling the operator to raise his sickle bar. Hacksaw Operates in Small Space ESIGNED for restricted space, a hacksaw with a 6 inch blade has only a 1 inch space from cutting edge of blade to the back of frame. The saw is handy for autos, models and gen- eral work about the garage or the workshop. Note how the tiny hacksaw fits the restricted space with ease. Modern Mechanix and

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REMOVE DRY CELLS LEAVIN BLOTTING PAPER IN THE HOLE. WRAP OLD DRY CELL WITH. 3 LAYERS OF BLOTTING PAPER. a REMOVE OLD PAPER FROM ORY CELL AND PUNCH HOLES IN, TRE ZING SHELL WITH AN POUR AN OUNCE OF SAL AMMONIAG SOLUTION IN EACH HOLE. Above sketches indicate procedure to be followed in bring- ing discarded dry cells back to life. Four ounces of sal ammoniac cán be obtained at drug stores for about 15c. VEN though a dry cell is completely dead, the rejuvenating procedure cov- ered in the above sketches will make it deliver rated voltage just as long as there is any zinc left in the case. Four of the cells hooked in series make a good hot shot bat- tery for ignition purposes. The size of box to be used will of course depend upon the voltage desired, each cell being rated at 1% volts. The asphalt used between cells can be obtained in chunks from any paving contractor, and melted in an old kettle. A thin laver of asphalt should be poured over the bottom of the box be- fore setting in the cells. Add four ounces of sal ammoniac to a quart of water to obtain a saturated solu- tion, and pour a few ounces into each cell pocket. Several hours after replacing the cells add more solution to bring the liquid level nearly to the tops of the cells. Inventions, January, 1935 Series-parallel connections are used for tube filament power; series for B or C batteries; parallel for high current. Operating Radio Without Aerial XCELLENT re- ception is ob- tained on many radio sets without using an aerial, if the antenna and ground binding posts of the set are connected togeth- er with a short wire. A mica con- denser is placed in series with the ground lead. ANTENNA” GROUND STRANDED WIRE Connect radio as shown to bring in programs without aerial. Use any size condenser in ground lead as shown above. 89

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Gwo Tube All-Wave Radio By using the new triple-function 6C6 tube, foreign reception with headphones, local programs on the loudspeaker are obtained with this compact two-tube all- electric long and short wave. receiver. =e ROTOR 1S GROUNDED TO PANEL TYPE 6C6 TUBE STATOR E INSULATED = FROM PANEL Chassis and panel dimensions for 2- tube all-electric, all- wave receiver are shown above. Mount ground terminal at right of phone jack, run ex- tension cord out at left. GROUND as Xa y ——__»* DSE PHONES OR 7 AS MIDGET. SPEAKER GROUND TERMINAL IS NOT INSULATED FROM METAL CHASSIS TWIN K PHONE JACK x VA fy &S Se, 4 wa í TYPE 37 TUBE N a 0005 MFD 50000 OHM 3 POTENTIOMETER —&} WITH SWITCH ‘ TO 110 VOLTS A.C. OR D.C. CONTACT ARM TERMINAL 90 p ADDITION to bringing in broadcast entertainment, this compact two tube all- electric receiver provides the thrills of for- eign short wave reception. It will work anywhere where 100 to 120 volt power, either alternating or direct current, is available. The set is built up on a metal chassis cut from aluminum or any available sheet metal. The metal front panel also serves as the front of the ornamental crackle finish metal cabinet used so extensively by short wave set builders. The entire set, with tubes, coils, and headphones, weighs less than four pounds. Though designed for headphone opera- tion, this set will operate a small magnefic speaker very nicely on the powerful local stations. Two or more sets of phones may be employed at the same time if desired. For foreign reception a good outdoor an- tenna with one of the commercial noise- eliminating lead-in systems is recom- mended, but for local broadcasts even a short indoor aerial will prove satisfactory. The circuit is beautifully simple. Only two tubes are used, one of these, the type ’37, with plate and grid tied together, serv- ing only as a rectifier. 4 PRONG PLUG-IN SHORT WAVE COILS VARIABLE TUNING CONDENSER „00014 MFD. Sola NJ 2 MEGOHMS Ss .0001 MED. ING ANTENNA TUNING CONDENSER (MIDGET) 3 TO 5 MMFD. g) INSULATEO FROM PANEL All connections below and above chassis show in perspective sketch of completed set. Set sliding tap on 400: ohm resistor at distance equal to one- eighth of total length of winding to get 350 ohms. Zn \ CENTER TAP 8~8 MFD. DOUBLE SECTION ELECTROLYTIC CONDENSER Modern Mechanix and

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ugs Into LIGHT SOCKET The new 6C6 tube used in this set actually does the work of three ordinary radio tubes, picking up the radio frequency signals, de- tecting them, then furnishing the audio frequencies for the headphone. Naturally, regeneration is used to make the set as sensitive and selective as possible. A potentiometer shunted across the tickler winding of the plug-in coil serves as regen- eration control. The Cisin Universal A.C.—D.C. circuit permits this set to be used interchangeably on alternating or direct current. The fila- ments of the two tubes are connected in series with-a 350 ohm voltage limiting re- sistor. In case a pilot light is desired for the tuning dial, this is connected in series with the tube filaments and shunted by a 30 ohm wire-wound resistor. The voltage limiting resistor should then be set at 320 ohms. A' small trimmer condenser in the anten- na circuit permits use of either a long or short aerial, and gives an added tuning control on weak short wave stations. (Continued on page 126) Plug-in coils shown will cover entire short-wave and broadcastband. Inlog- ging stations be sure to record num- B ber of coil which was used, since wave bands of coils will overlap somewhat. 15-25 METERS COIL, A: 4 TURNS oR 5 n Fl 50-100 METERS COIL A: 7 TURNS " B23 0 © COIL A 25-50 METERS” COIL & 6 TURNS .000035 MFD. MIDGET VAR. CONDENSER 100-200 METERS COIL A: 15 TURNS 50,000 OHM POTENTIOMETER ~~” Regeneration control at lower right and large vernier tuning dial are pe main controls on this short wave set. S WIND COILS WITH ANY SIZE ENAMELED OR INSULATED WIRE FROM NO. 24 TO NO.32 B.&S, GAUGE FI j 375~ 550, METERS COIL A;°35 TURNS 1 Bilas U 200-375 METERS Standard 4-prong COIL A: 30 TURNS Plug-in coils are 3 B:70 #8 sold by radio sup- ply houses, or can be wound upon radio tube bases to specifications shown here. For broad- cast band coils use standard plug-in coil forms. Wire size is immaterial; smali wire, perhaps even No. 36, is needed " B50 " to get necessary turns on larger coils. TYPE ‘37 TUBE 30 MH. CHOKE X IS BETTER THAN G = RESISTOR b + $o 10 VOLTS A.C. OR D.C. Schematic circuit diagram of set is shown here for those who prefer to plan their own arrangement of parts. Filter resistor of 10,000 ohms may be replaced by standard filter choke if a.c. hum comes through phones. In tuning set, locate station with tuning dial, then adjust regeneration potentiometer until set is just ready to break into regeneration squeal. Antenna condenser need be tuned only for weak short wave stations. Note that set wiring is grounded to chassis at one point only. Inventions, January, 1935 9l

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Amaze Friends with this Sound “Robot Above photo shows construction of simple tripping relay. Te \ mg Wi ii | IATA i \ | PAPER DIAPHRAGM \ Wit y L Wh | [UR H ih i W LA ipa LENS th t METAL DISC GLUED TO DIAPHRAGM Glue tough wrap- ping paper over 6” hole in panel, stretching taut be- fore glue dries; apply hot lard. 92 TERMINALS By simply clapping hands in front of sound robot device, amateur electrical wizard sets fan in motion, shuts off lights. TEPPING up to a mysterious oiled paper diaphragm, ihe amateur electrical wizard mumbles unintelligible Greek words, sud- denly claps his hands. Room lights go out almost instantly, and an oscillating electric fan throws its turbulent air blast over the faces of surprised friends. The sound robot is made from easily obtainable materials. After the paper dia- phragm is in place, a thin metal disc having soldered to it a fine wire lead is attached to the center with a drop of sealing wax. Adjust the pointed screw of the fixed con- tact to touch this disc at the slightest move- ment of the diaphragm. Almost any magnet coil or door bell magnet having around 100 turns of No. 22 or larger magnet wire will be satisfactory for the trip relay. As the soft iron hinged armature is pulled forward by the magnet, it allows the weighted lever to drop, closing the large contacts which control the fan. Circuit ‘diagram of sound robot. Paper diaphragm set in vibration by sound waves closes relay coil circuit, and control contacts start electric fan. Modern Mechanix and

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—SSSS ps sy Clothesline Support for Basement ee = A zh g = CLOTHESLINE can quickly be strung up and taken down in the basement if these hinged extensions are mounted on the rafters. Pieces of wood one foot long are hinged to the rafters as shown at the left, and %-inch holes drilled in the lower end of each arm. Rivet the hinge pins enough so the extension arms will stay up out of the way when the line is not in use. Push the doubled-up line through the hole, as shown.—C. J. Haas. 346” SCREEN RESTS ON LUGS Sifter Removes Hard Kernels from Popcorn | Weate ae kernels of popcorn may be removed in a jiffy with this improvised sifter. Neatly round off the top edge of a one gallon tin can, then solder small metal lugs to the inside.of the can at a height of about two inches above the bottom. Cut from a piece of 3/16”x3/16” galvanized screen a circular piece which will just fit into the can and rest on UNPOPPED KERNELS the lugs. Cover of can may be used instead of screen FALL TO“ BOTTOM 27 if it is punctured with 3/16” diameter holes.—J. Hora. ces Seep Simple Charcoal Deodorizer for Your Refrigerator (By | THS inexpensive deodorizer will effectively absorb the dis- \ ; agreeable odors emitted from foods stored in the refrigerator, and at the same time keep meats in good condition. Punch a number of small holes in an empty baking-powder can. Fil] the can with either unslaked lime or willow charcoal, then place it in the refrigerator. Replace contents occasionally.—A. J. Kukwa. Percolator Tube Is Good Cream. Catcher ¢ i OFTEE 3 Wire pure cream is to be skimmed off the top Shp case ~N of a bottle of milk, this inexpensive cream-catcher will be welcomed. Saw off the coffee compartment from the inside unit of a discarded percolator, and cut away the bottom flange. To use, lower the tube, bulb end down, into the cream as far as the milk line, press the finger over the upper end of the tube, and lift out. Almost all of the cream in the bottle can be removed in this manner without disturbing the miJk—A. H. Waychoff. as Turn Door Knob With Handy Foot Pedal. s\TT eas A FOOT-OPERATED lever for turning door knobs i will prove handy on those doors which must be frequently opened when carrying in trays, packages, wood, or ashes. A six-inch long lever is fastened to the door knob with a bolt a bit longer than that used to hold the knob in place. From the outer end of _ this lever a wire is run to another lever mounted about five inches above the floor and serving as a foot pedal. Pressure on this bottom lever will release the catch, allowing door to be pushed open. If door fits too tightly, it may be necessary to plane it down a small amount on sides and ends.—H. F. Throsel. Inventions, January, 1935 93

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Ņ Christmas LIGHTING Effects Electrically lighted Yuletide decora- tions in “moderne” design add a gala holiday aspect to the exterior of any home. The novel effects por- trayed here are easily made in the home workshop at little expense. ae LLU “Three Wise a Men” scene with = candles is used in alcoves hav- ing three win- BLACK dows. Squares over design aid in transferring. C BOARD DETAIL OF PYRAMIDS COR. BOARD 2x4" X 24" A ‘MODERNE’ XMAS TREE Concealed lights of different colors illuminate silvered pyramids of “moderne” Christmas tree, construction of which is shown above. Frame of tinsel star is coat hanger. UR Forefathers placed a lighted candle in the window on Christmas Eve to flicker a Yuletide message of hospitality to wayfarers, but the custom gradually fell into disuse. Recently it was revived in a more modern form, the electrically lighted candle. The custom is gaining favor again, and in some communities prizes are offered for the most elaborate and novel effects. Here are a few suggestions which may be followed indoors as well as outdoors in your cffort to brighten the holiday season. A lighted Christmas scene, Fig. 6, gives 94 Below paper design for “Merry Christmas” shadow box intend- ed for use on lawn or the house roof. is squared FIG.5 as SQUARES ] BEAVER. BOARD if pm E] angg ‘CUT OUT AN PAINT BLACK [ee wa Bee sar peo z Modern Mechanix and

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or the MODERN HOME

CHRISTMAS FLOODLIGHTING BIRCH TREES around the house stand out best when illuminated with red floodlights. BLUE SPRUCE trees require blue floodlighting. EVERGREENS of other varieties stand out with either red or blue illumination. HOME itself uses lights same color as walls. by DAVID A. BROWN FIG- 9 BARREL ` HOOP STAR Illustration at right shows how to make “treeless” Xmas tree by using only a ten-foot mast and strings of lights, to be used in a dark corner of your lawn. FIG. 10

BORE HOLE LOOPED CORD FORMS ; . SOCKET FOR LIGHTS “Eek © WIRE SCREEN -DIPPED IN = YELLOW PAINT. . 50 WATT << » BULB TA ig BEAVER BOARD Fe ¥: "TREELESS' Yi XMAS TREE \

SILVER “ es BEAVER= B:

< "XA" PINE

BOARD

STONE PATT ERN LINOLEUM n S | FIREPLACE (DIMENSIONS ; TO SUIT ROOM.) RED AND YELLOW CHEESE CLOTH LOG

RED CLOTH 50 WATT LAMP

Realistic fireplace with flickering flames is readily built up from light-weight materials. Cover with brick design crepe paper. Pattern for half-section of andiron is shown at right. Inventions, January, 1935 BRICK PATTERN 47 CREPE PAPER ma CORRUGATED: 7 LIGHT CORD È

LS R FiG.8 GIANT CANDLE á COVER FRAME WITH CORRUGATED BOARD, STRIPPING JOINTS AS SHOWN Giant candles are to be set on each side of doorway or gate. Screen dipped in yellow paint gives effect of candle flame. a startling and novel effect when used on the porch roof or lawn. A shadow box is constructed of light material 4’ 6” x 3’ x 8”. The back is Beaver Board painted navy blue. Lay out Santa and the reindeer and the house tops on another sheet of Beaver Board about 4’ 6” x 3’, marking it into the same number of squares as Fig. 5. Using the intersecting lines as guides draw the outlines, then cut out and paint black. Tack the house tops to. wooden cleats nailed in place two inches back of the front edge of the box. The other group is fastened with strips of adhesive tape on the back to four fine wires stretched from top to bottom just back of the house tops. Tufts of cotton placed along the edges of the roofs give the effect of snow. Three 25-watt blue lights behind these figures will silhouette them (Continued on page 123) 95

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Copy Portraits or Scenes With Simple “Cartoono-Graph” PEEP- HOLE AMBROIDED 1/8” SOFT BRASS ROD 10” HIGH = PAINT BLACK PINE MIRROR ON BACK OF HOUSING DRILL WITH NO, 21 30° ANGLE “Cartoono-graph,” mounting arm, and easel are construct- ed to dimensions shown above, Slots in cardboard side pieces allow light to enter prism box. Paint housing black, RESENTED here in simplified form is the prism reflecto-graph long used by steel engravers in making etchings. With it one can copy illustrations, landscapes, or interior scenes. Even portraits are easily sketched with the aid of this “cartoono- graph,” for the image is clearly reflected on the drawing paper where it can be traced. Odds and ends of glass and a bit of mir- ror are used to replace the expensive solid prism. Cut out the mirror for the back of the housing with glass cutters, or hold it under water and cut with shears. The top and front pieces, of clear glass, make up the other two faces of this hollow prism. The front piece, set at a 30 degree angle, will throw a better “ghost” image if covered with dust and fingerprints. Old Revolver Serves as Table Lamp N INTERESTING desk or table lamp for the den can be made from an old revolver. Bolt the butt of the gun to a metal base, then fasten a lamp socket into the end of the barrel. The electric cord is run through the barrel to a switch so mounted that the Iamp can. be turned on and off by pulling the trig- ger. The type of re- volver that breaks for loading will give a lamp which is readily tilted. Here’s one version of a re- volver lamp; cylinder may be removed as safety precaution. The trigger operates a switch. 96 SIZE OF IMAGE ON GLASS VARIES DIRECTLY AS THE DISTANCE OF PRISM FROM THE EASEL 3/8" ke} a [l 1 / 2 SIDE { / PIECES “Byer 0c BACK PRISM HOUSING 1⁄4” = 3 PLY 7 ie “cartoono-graph” so light comes from one side. Locate Image and white paper on table are seen through peephole. Make Bowls With Turned Log Slabs ISCS of wood taken from the trunk of a tree can be turned out on the lathe to form novel and attractive fruit bowls. These slabs can be sawed out by hand, or picked up for almost nothing at a sawmill; select pieces which are as nearly round as possible, and with the bark unbroken. Mount the slab on your lathe face-plate in the usual manner, and hollow out the face of the bowl to any desired depth. After carefully sanding the bowl, apply a dark wood stain, then varnish. Small branches are cut out to form handles, then glued after careful fitting into holes drilled in the rim of the bowl. Attractive fruit bowls in rustic pattern are turned out on lathe from easily obtained log slabs. Apply clear lacquer to the bark, and any desired finish to remainder of bowl. Modern Mechanix and

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Ice Sled Has Sailing Wings 7 N WINTRY days when the wind is brisk, this wing-sail sled will carry you to and fro on your favorite pond with breath-tak- ing speed. The unusual wing-like sails, open in the center, give full vision ahead at all times, making this sled ideal where the ice is dotted with skaters. Light weight is achieved by using white pine throughout; hardwood runners are : £ ggi Tecommended, however, on rough ice. a Ee ‘Lay out the stream-lined runner pattern X T'Y4t CARRIAGE BOLT, SNE NAIL IN A a SS Bees Fasten bamboo sail DRILLED Cs HOTE FOR oe SN frame together with ad- BOCES 5 CA NO hesive tape, then shellac £ J ; = TAPE yr N it to prevent splitting. gji ; BY HAULING IN THE "MAIN SHEET” TO PORT OR STARBOARD, SO THAT SAIL IS ABOUT 45° TO Di- RECTION OF TRAVEL, THIS CRAFT WILL MOVE AT RIGHT ANGLES | LAY QUT RUNNER IN + SQUARES a 41 —| i i WIND Assembly of rear runners is shown above. Use unbleached muslin or any bright-colored cotton cloth for sails, and paint sled itself in contrasting bright color. Set sail at 45 degree angle to travel across wind or for tacking. Inventions, January, 1935 C Above dimensions are for 10-year-old; larger builders should increase distance between run- ners. Fasten spars to mast with leather thongs. full size, then transfer it to your one-inch thick runner wood. A strip of 3/16” square cold-rolled steel, or even an old sled runncr, is set into a groove cut into each runner, and fastened in place at the end curves with strong staples. A runner of this type can be kept sharp with a pocket skate-sharpener. Assemble the different parts of the sled with wood screws. A bolt bead is passed through the underside of the foot bar be- fore fastening to the steering runner. Bamboo is recommended for the sail spars and uprights, adhesive or friction tape being used to fasten the pieces to- gether. For the mast a broomstick or any 1” diameter round stock may be used. Wire stays with turnbuckles keep the mast rigidly upright. 97

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“How to START Your Car by L. J. MARKUS INTER brings a multitude of troubles to the auto owner, the most annoying of- which is undoubtedly the starting of a car which has stood outside or in a cold garage overnight. Ether has been injected into the combus- tion chamber of engines for years to aid in igniting the gasoline. With modern cars, where it is difficult to get liquid ether into the engine, soak a sponge or cloth with HELD TO AIR Gye: ether and hold over the air intake of the “CARBURETOR 2 carburetor while someone is turning over 7 the engine. The fumes will be drawn through the carburetor into the engine, where they mix with the gasoline. The old saying about prevention being better than cure very aptly applies to the car. By keeping the engine just warm enough overnight to prevent oil from con- RON gealing, there will be no cold-morning start- ZA ing troubles. a A 100 watt bulb placed against the car- buretor and left burning through the night will not consume more than five cents worth of electricity, yet will keep the en- gine warm. The regular garage extension light with a wire guard is covered over with old blankets or sacks, to keep the heat in AND MANIFOLD.. 7 z as much as possible. Be careful that no ROER ENGINE. LES aa inflammable material touches the bulb it- 5 i self. This method is generally used only PLACE THE LAMP AGAINST CARBURETOR s Ether-soaked rag held near the carburetor intake makes starting of cold engine easier. To keep engine warm during 3 cold nights, place electric bulb near carburetor, then cover PAINT ALL S = 4 m engine with blankets. Shellac wires to keep out moisture. HIGH TENSION ~ oe : WIRES WITH i (I) DEPRESS CLUTCH PEDAL TO DISENGAGE GEARS OF TRANSMISSION.. © ‘SPIN MOTOR WITH IGNITION TURNED OFF,AND WITH CHOKE OUT.. z © TURN ON IGNITION, START MOTOR AND ALLOW IT TO WARM UP BEFORE RELEASING CLUTCH.. BATT. FOR X STARTING Radio trickle charger connected to car as shown will keep battery in good condition for winter driving. Extra storage battery in parallel with car battery will spin starter faster, Strap extra battery down securely. Cold- weather starting procedure for autos is indicated above. 98 Modern Mechanix and

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in BELOW-ZERO ‘Weather Below-zero temperatures reduce the power of your car battery and at the same time make the engine far harder to start. Try these kinks the next time your engine is too cold and stiff to start.. px" Q : £P COIL When battery is almost dis- charged, connect. bell trans- former or dry cell as shown 7“ ` TRANSFORMER Tor = above to get the cat started. 1a- IGNITION SW. yE z me Fa when the temperature gets down to around be al PORANNE 20° below. Snow seeping in over the engine will 7 often cause leakage of current from the high pectic iron held against mani- tension wires. This can be prevented by fold will take chill from engine. shellacking all ignition wires, making them doubly waterproof. Even with the generator charging rate set at the maximum, it will be impossible on some cars to keep the battery fully charged in winter. A radio trickle charger connect- ed to the car battery each night will save many a trip to the battery service station. Attach spring clips to each lead, snapping one to the frame of the car, the other to the cutout terminal. Polarity is correct when the ammeter shows “charge” as the charger is switched on. Where an engine is unusually hard to EN dens start, or where a car is left out on the street MANIFOLD all day, an extra storage battery is recom- 4 F = mended. Strap this down somewhere in the back of the car, and make connections with regular starter cable. If the negative of your battery is grounded, one cable l ; A f should go from the negative of the extra _ 4 è Aco inc battery to the frame of the car, the other si LS WATER . to the positive of the regular battery. In connecting “hot” leads together, scrape off insulation for a few inches, wrap bare cop- per wire over the two leads, and apply solder freely to the joint, using acid if necessary to clean the copper. With this paral- Be of Bot sand placed lel connection both bat- fold warms up engine. teries will be charged at See) peter tA the same time by the around carburetor and manifold, then pouring auto generator. on boiling water. With carburetor warm, fuel (Cont'd on page 126) vaporizes more easily, > BOILING WATER IS POURED UPON CLOTHS WRAPPED AROUND CARBURETOR MANIFOLD Inventions, January, 1935 99

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Scrambled Pictures Add Zest to Old Fifteen Block Puzzle PICTURE GLUED TO BLOCKS BLOCKS STAINED t SHALLOW WOOD BOX BLOCKS SHIFTED BY In novel variation of 15 block puzzle, picture glued to blocks is scrambled, then blocks shifted to form it again. Stain ome side of blocks to facilitate replacing in box. Snapshots With Photo Flash Bulbs NAPSHOTS taken with a speed as fast as 1/300th of a second have been made with this simple mechanism for synchron- izing photo flash bulbs with the camera shutter. The method can be applied to all cameras having a setting lever for snap- shots. One of the leads which would normally go to the photo flash switch is grounded to the shutter frame, the other connected to a steel spring mounted on an insulating block near the shutter. This spring is so adjusted that the setting lever will make contact with it at the instant the shutter is opened. This closes the circuit to the photo flash bulb, setting it off. Photos and sketches show mounting of synchroniz- ing switch on camera for taking of photo flash snapshots at high speeds. CONTACT „FIRES FLASH “BULBS ~ N SHUTTER EZ r GROUNDED 100 OMBINING the good points of the fifteen block puzzle so popular a generation back with the jig saw puzzles of a few years ago, scrambled pictures provide absorbing entertainment guaranteed to while away many a long winter evening. To construct this puzzle, make a shallow box which will hold either 16, Z5, or 36 square blocks of wood. Select a colored picture having sharply defined details, and trim down to the size of your box. Glue the picture over the blocks, then cut it apart with a razor blade. Scramble the blocks, remove the key block, and begin. Making Pen Sketches From Photos mr Ei P Re EEE Original photograph is shown above; below is pen sketch made by tracing over photograph with water-proof India ink, then bleaching out image with chemicals. Sketch is tinsed in cold water, placed for 10 min. in bath of 2 oz. hypo, & oz. water, then rinsed for 1 hr. in running water. EN and ink sketches can be made di- rectly from photographs. After making a light-toned enlargement from the selected negative, trace over with waterproof India ink the parts of the photograph which are to appear in the finished sketch. After the ink has dried, place the print face up in a tray containing one ounce of copper sulphate ground to a fine powder and dissolved in enough warm water to make a dark blue solution. Add small quan- tities of table salt to speed up bleaching. Modern Mechanix and

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Chromium Like Plate Easily Applied CHROMIUM like finish on copper or brass is applied by this method just as easily as is a paint finish. Place a pinch of red mercury oxide in a small porcelain dish and pour in a few drops of 50% nitric acid. Stir, then apply to the metal with a small piece of cloth tied to a wood splinter. Cleaning of the metal usually is not necessary, since the nitric acid removes dirt and grease stains. Paint should first be removed with steel wool. The fluid works in almost magical manner, a small quantity being sufficient.—Kurt Borm. Raised-Letter Signs Easily Made From Wood PLESsIN G raised-letter signs can be made without any hand carving by this simple but ingenious method. Lay out the desired lettering on a piece of soft pine board. Using a nail set, punch the letters down to about 4” below the surface. Plane the wood down until a light cut has been taken from the tops of the letters, then soak the sign for around six hours to bring the letters back PRAISED to their original height. A coat or two of paint finishes ON BOARD = the job.—Herbert Arral. Make Own Rubber Cement for Mounting Photos FonGe artists have been using rubber cement for years, it has only recently come into widespread general usc. Stamp collectors, finding that a dab of cement near the corner of each stamp will hold it down firmly yet permit at | f removal with no damage, are using the cement in place of f AN stamp hinges. Amateur photographers find the cement ideal j ‘ll for mounting photographs, since it does not cause wrinkles. To make your own cement, place an ounce or so of pure or grey rubber in a wide mouth bottle. Pour enough carbon tetrachloride into the bottle to cover the rubber, then cork tightly and allow to stand for a few days in a warm place. After the rubber has completely dissolved, thin out the cement if necessary by adding more solution, or thicken it by exposure to air. Since the carbon tetrachloride readily evaporates, keep your cement bottle tightly stoppered when not in use. Apply the cement with a small brush to both surfaces.—Chemcraft Chemist. IF PAINT“ CREEPS” OR Powder Stops Oil Paints From Creeping V WILL NOT i EDGE WIPE SURFACE HEN painting or lettering with oil colors upon '. GASOLINE, OR, pusr glossy or oily surfaces, the paint sometimes z creeps. If a wiping with turpentine or gasoline does J o ROLL oi cio not help, the trcuble can be overcome by dusting =| ENTIRELY DRY— : | on powdered Bon-ami. Rub off surplus powder with a clean piece of cheesecloth. To roll up oilcloth signs i before the paint has completely dried, dust with tal- A cum powder or Bon “OL = - PAINT, 4 elon sw... ‘| Ami.—Leslie Nagg. = popem : ! IN GALLON AS Waterproof Glue Made From Scrap Celluloid A Cereb ote glue ideal for model airplane and model boat construction work can be made up at little cost from scrap celluloid. Place two pounds of scrap celluloid in a wide-mouth gallon jar, then add a half- ounce of camphor and fill the jar with commercial acetone. Allow the mixture to stand for an hour, then == stir with a stick. By the next day you should be able to F 2. EG WITH ACETONE” stir the glue into a homogeneous mass.—E. F. Waldron. Inventions, January, 1935 101

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Print Photographs in Finished envelope hold- er having photographic view of old waterwheel printed in color on bur- nished copper surface is shown above. Personal photos or scenic views can be printed directly from negative upon metal, glass, wood, or any other smooth, light- colored surface by proc- ess described in text. Fig. 2——A strip of cop- per 4” wide all around design is pounded down over hardwood form with wood mallet, work- ing carefully to avoid wrinkles in any one spot. OU can inject a personal note into your Christmas gifts this year by placing on them photo- graphs of yourself, of friends or of scenes you have snapped with your camera. Any smooth surface can be treated in this way, includ- ing metal, wood, glass or compo- sition. The pictures are perma- nent, can be made in any color, and have the shiny, glass-like ap- pearance of glazed enamel. As an example of a home shop project easily treated by this process, the construction of a copper envelope holder, an al- ways-appreciaied gift, will be ex- plained. Secure a piece of 6 in. by 10 in. sheet copper of about No. 16 gauge from a plumbing shop. Make sure that it has no dents or scratches. A shaping form is made of 1 in. wood, 5% in. wide and with one end cut in a curve or design. Mark the cop- per, at both ends, with the same design, but allow % in. on the edges for turning over. Round all sharp corners of the wood form. Then, with a wood mallet pound down the edges of the copper. Turn the sheet over and pound the edges back down on themselves carefully, using light taps to 102 Fig. 3.—Copper edge is hammered back on itself, working carefully to avoid wrinkles on curved portion. Fig. 4—With edges re-inforced, copper is bent into shape of “U”. COLOR Fig. 1.—Design for letter holder is first cut out from hardwood form. Sheet of cop- per is marked for cutting so that it will be 14” larger, on all sides, than wood form. Trim off surplus copper with tin snips, then file smooth. avoid buckling. This reinforces the sheet so that it will be rigid when it is bent into a “U” shape. Allow 2% in. for the bottom; one side is 3 in. high, the other 4 in. high. With fine pumice or some other good abrasive polish the side that is to receive the photograph until it is smooth and glossy. Dry the surface carefully, and see that no bits of lint or other foreign matter which would cause specks in the photo- graph adhere to it. You can get small sheets of clear gelatine at the drug store; soak several in cold water Modern Mechanix and

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on METAL Gifts by KENNETH MURRAY until they are limp. Heat a pan of water; into it place a wide-mouth bottle contain- ing four or five ounces of water. Add just enough of the soaked gelatine to make a solution of the consistency of syrup. This must be filtered twice through a wad of cotton in the neck of a funnel,.so that it will .be entirely clear and free of lumps and particles. The “sensitizer” is a simple solu- tion of ammonium dichromate. Dissolve as many of the red crystals in an ounce of warm water as possible. Add sufficient of this solution to the liquid gelatine to give the Jatter a deep orange color. Coating of the cleaned copper surface is done in a room with a yellow light. The light from an ordinary bulb covered with a thickness of yellow paper will be entirely safe. Flow the orange gelatine solution over the copper surface while the latter is held level in one hand. Drain the excess solu- tion back into the bottle to be used again. Allow the gelatine to drip from one corner of the copper while holding it over a gas or electric stove, letting the copper become (Continued on page 122) Fig. 5—Polish sur- face receiving pho- tograph to high gloss, using pumice or other abrasive, Inventions, January, 1935 Fig. 6—Add_ softened sheet gelatin to five oz. of hot water in wide- mouth bottle to make solution thick as syrup, Fig. 7——After “sensitizer”? emulsion has been spread over copper and dried, place envelope holder under negative in print- ing frame. Use yellow light illumination for this work to prevent early exposure. FIG. 8 Fig. 8—When correctly exposed before arc lamp or in sun- light faint brown image will just be visible on copper holder. FIG.9 Fig. 9—~After masking off portions of picture not needed, copper is “inked up” with ordinary ink roller and selected color of lithograph ink. Repeat inking process until all de- tails of photo show clearly. Fig. 10.—Photo as well as copper face of letter holder can be protected by spraying with lacquer. 103

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PUES handy wire tongs will be useful to the auto- mobile mechanic who occasionally has to recover Use Alcohol Burner to Heat Radio Soldering Iron HERE electricity or gas is not available, this complete soldering set will be found far handier than the usual gasoline blow torch for radio work. A 1%” length of No. 1 copper wire is filed to a four cornered point, and a hole drilled into the opposite end for the bicycle spoke handle of the solder- ing iron. To make the heater, remove the spout from an oil can and solder in its place a length of %” copper tubing. Double up a lamp wick and push it through this tube until about 14” projects above. Solder two supports made from No. 10 wire in place to hold the soldering iron ee Senechal. HEAVY WIRE ‘Ss To Grasp Tongs Pick Up “Out- VA Bact- snoRTeR SLID DOWN of-Reach” Bolts : small objects such as bolts or nuts from cramped places in transmissions or oil pans. The radio engineer, too, will find. them useful in recovering nuts dropped into a crowded radio chassis. Two pieces of springy wire are shaped as in the illustrations. To pick up an object, slide the shorter wire down on the tongs; the ends come together, grasping the object. The device is easily worked with one hand.—A. Cole. Tris Piece Mi Wrist Pins Make Sturdy File Handles JE YOUR file and chisel handles split apart too often, try this wrist pin kink. Get a wooden peg a trifle larger than the inside diameter of the wrist pin, and pound it into the pin. Saw the wood off flush with the ends of the pin, then drill a small hole into the center of the wood on one end for the handle. This handle will prove a comfortable fit for the hand, and stand up under the heaviest of work without splitting. If used with chisels, the pin prevents wood from spreading.—LaVerne Anderson. SLIDES OVER DOUBLE PIECE Sanding Machine AN OLD phonograph with either spring or electric Motor can be readily converted into a handy power sanding machine for the workshop. Just place a circular piece of sandpaper over the turntable, perhaps using a few drops of shellac to prevent it from slipping. Flat surfaces are accurately trued by the disc; model makers will find it useful for smoothing small objects—Ilerbert Arrall. Cork and Nails Make Handy Pipe Calipers WEEN taking measurements of the inside of a furnace pipe, in order to know exactly what size pipe must be bought, the usual procedure is to mark the diameter on a stick. Errors of as much as %” may occur with this makeshift method. Accurate inside calipers are readily made from a cork and two long nails. Press one of the nails into each end of the cork, as shown in the accom- panying drawing, adjusting them so they will slip into the opening. The calipers can now be taken to the store and used to find the exact flue pipe needed. The same calipers will, of course, be found useful for many other purposes about the shop and home.—A. Vena. Modern Mechanix and

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OIL BURNER Heats T Cheaply Z DRUM OF. CRANKCASE Just a few minutes after lighting, this vaporizing oil burner is roaring full blast in your workshop stove, sending cheery heat to every corner of the room. Automobile crank- case drainings, costing very little, can be used for fuel. HEE is one answer to that perplexing problem of obtaining heat in the home workshop. The oil burner described here delivers its full quota of heat in a few minutes after it is lighted, whereas wood or coal stoves take considerable time to get hot, and require constant attention through- out the evening. A fifty-five gallon drum of crankcase drainings, obtainable for around fifty cents at your local gas station, should supply fuel REPLACE LID WITH“ PIECE OF SHEET I a7, Installation of vaporizer unit in small coal heater is pictured at left. Outer pail may be omitted where the firebox is small. Readjust the fuel valve after room is warm to pre- vent overheating. for about one month’s operation of this burner. The heart of the burner is the vaporizer, an inverted gallon paint can having a dished top. Be sure the can you use has clinched seams. Dish the bottom in with a ball pein hammer, then punch out five holes with a nail, one in the center and four close to the edge. Six slits opening outward for about %” are cut into the sides from top to bot- tom, to supply necessary draft. Inventions, January, 1935 “DRAININGS ane LESS PAIL. — = HOLES Construction of vaporizer unit is shown above. Draft comes up through grates, then enters vaporizer through flared-out slits. Control heat with valve at fuel drum or by valve in 14"' diam. pipe line leading to stove. A bottomless pail and a pan about 1%” smaller in diameter than the pail make up the remainder of the burner unit. Fill tne pan about half-full of ashes, then set the vaporizer in it. Now place the pan in the middle of the bare stove grates, and center the inverted pail over it. The space be- tween the pail and the sides of the stove is filled with about two inches of ashes. The oil drum is mounted on brackets at some convenient point well above the stove. The feed pipe going to the stove should have as much slant as possible. Once the burner has been started, that oil which strikes the top of the vaporizer is practically all consumed; a small por- tion seeps through the holes to burn below, keeping the vaporizer top hot. Starting is simple and quick. Merely pour a cupful of kerosene on the vaporizer, then open the oil valve until a stream about 1/16” in diameter flows into the pipe. Toss a lighted match into the vaporizer; in a few minutes the cheerfully roaring blow- torch noise will be heard. 105

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How to IMPROVE That by DALE R. VAN HORN THE roof is the crown on your home. No matter how good the walls, what expen- sive furniture inside, or how well the rest of the structure has been built, without a good roof, your abode is not first class. A suitable covering, both weatherproof and durable, plus adequate support under- neath are the two fundamentals of a good roof. Details may vary. Many homes today are covered with composition shingles hav- ing fire-resisting properties, incorporating the advantages of color combinations. A goodly number of home owners still prefer good old fashioned red shingles. The type ae ae a Ee eee eee of roofing material is largely up to you. If you go into your attic on a bright day and note many pin holes of light showing through, you easily will come to the con- clusion that your roof is in line for a new dress. With this inspection comes, too, the condition of the eaves, the valleys, any sag- ging point, and whether the roof meets the wall without any sign of a gap. fh no eee ees ele One of the newer trends is to close gaps TURN DOWN SHEET 2 AND NAIL of this nature with a special material, forced into space with a gun not unlike the type used for force-greasing the automobile. There is no need to mention that the chief advantage of tight unions between walls and Above drawings show how to apply roll roofing. Put first strip on lower edge overlapping next until roof is done. i a ee ae PS, NAIL STRIP IN PLACE x Pp se SS OVER VALLEYS KA TA AND RE-FLASH PETIA ” RR E DN NAIL SHINGLES OVER NEW CUT AWAY AER DANNET N FLASHING WITH HALF INGH EDGES TO PROVIDE C A on OVERHANG AT EAVES SPACE FOR I“ x 2" E E 3 7 5 COURSE OF NEW | STRIP TO ENSURE ee S ees Like Gib SHINGLES eT 3 4 erent ete Figures illustrate steps in putting new shingles over old roof. Shingles at gable edge are cut off and replaced with nailing strip. Old flashings remain, the new flashings being placed over them. Shingle from bottom upwards. 106 Modern Mechanix and

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ROOF on YOUR HOUSE Repairing the roof on your home is not a difficult job, Cut down your heat bill by putting new roofing over the old and fol- lowing other suggestions given here by Dale R. Van Horn. When re-roofing consider home revision, Photos show how addition im- proved ordinary cottage. roof, or between wood and masonry, is the saving of heat in winter. Whereas a few years ago a yard cluttered with old broken shingles and a general mess proclaimed to one and all that the Jones’ were having their roof recovered—today that confusion is missing. Putting the new roof right on over the old is smart because of the saving of labor and debris, and be- cause the old covering plus the new gives greater roof insulation properties. Approaching the job in the proper man- ner, it will be wise to keep in mind the several steps portrayed in an accompanying group of illustrations. Note that the shingles are cut away from all edges to permit the laying of astrip. (See Figs. 1 and 2). This applies to roof edges, the ridge and dormers as well. Instead of tearing out old valleys and flashings, foundations for new sheet metal are built up easily as shown in Figs. 3 and 4. From then on, the work progresses much as though the house were new and it was being roofed for the first time. Of even simpler application is composi- Inventions, January, 1933 tion roll roofing, which is laid on as indi- cated in accompanying drawings. Those of you who insist upon asbestos base compo- sition roofing have a choice of the roll roofing, and individual squares of composi- tion asbestos or slate. Some wooden shingles are chemically treated to make them fire resisting. Some- times the roof is fundamentally good, does not warrant the cost of a recovering. job. Then by careful patching, and particularly by staining the shingles, a new-roof appear- ance results. When doing over your roof, keep in mind the possibility of. finishing the attic. If this is contemplated in the near future, then the floor space should be divided into the future rooms and the studding set in place at this time. Later it will be only a matter of ap- plying the wall finish material and this addition of the studding will more firmly brace the roof timbers. One of the best ways to chink spaces be- tween the wall top and the roof is with con- crete mortar to which has been added a 107

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Use Wallboard and Concrete to Stop Heat Leaks in Roof of Your Home ROOF ~ g Lb WALLBOARD NAILED TO RAFTERS ATTIC JOIST CONCRETE FILLER HELD IN PLACE BY LARGE NAILS DRIVEN INTO TOP PLATE .. SLAKE CONCRETE WITH LIME ANO FORCE INTO ALL -NOOKS AND CREVICES WALLBOARD STOPPING LEAKAGE OF ROOF. AND WALL Wallboard and concrete used as shown above will keep warm air from escaping. At right is a spark arrestor for the chimney. It is simply pressed down inside the flue. small amount of slaked lime. This can be mixed right in the attic and placed on top of the walls and forced into all crevices. Nails driven into the timber on which the rafters rest will hold these sections of con- crete firmly in place as shown in the illus- tration. Since warm air from rooms below will work up under the roof if it can, it is im- portant that the roof be as tight as possible. Sealing with the caulked joints and with’ concrete under the eaves is mighty helpful, but further insulation properties can be ac- complished by nailing inexpensive wall board to the underside of the roof rafters. This can most economically be done in con- junction with a general finishing of the attic. By all means, thoroughly inspect the flue at this time. A chimney which rests on a wood platform is always a fire hazard. If this type exists, it should be removed and a chimney resting firmly on a concrete foun- dation substituted. Inspect closely, too, for spots in the chimney in which the mortar has loosened or worked out of joints. Such a condition is inviting a fire of the worst sort. The decay or gradual disintegration of mortar joints in a chimney usually occurs most rapidly at the top. Here fumes from the furnace plus all kinds of weather con- ditions will gradually loosen the top row of brick. Topping the chimney with a concrete mortar cap is the remedy. This step re- quires but two forms made from 1-inch ma- terial. An accompanying illustration shows the method. The cap itself should be 3 or 108 Cone PRESS THE ‘EDGES AGAINST. BRICKS IN FLUE CUT SQUARE OF 4 MESH -STORM SCREEN THUS TO - =- SUIT SIZE OF FLUE WHEN SHAPED AS SHOWN ABOVE- IMPLE SPARK-ARRESTOR oe NAIL OR REINFORCE CORNERS WITH WIRE OR RODS MAKE CAPPING FRAMES OF I" BOARDS 4 TO 6 INCHES WIDE TO FIT CHIMNEY TOP AS SHOWN BELOW The concrete capping shown above will preserve the chim- ney top for years. Only two simple wood forms are needed. 4 inches thick, with the top edges beveled and all four corners reinforced with gal- vanized wire or iron rods. Clean the top bricks well and soak them thoroughly be- fore pouring the mortar. After pouring, the concrete should be kept moist for three days or longer to insure proper curing. Cover with moist rags or sprinkle with water. Modern Mechanix and

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Handy Line-Width Indicator for Drawing Pens "tx i A HIS easily made indicator on your drawing pen provides (ik Sim BN à an instant and accurate setting of the pen to any desired = ott 7 fp thickness. A hole is bored into the blade just ahead of the knurled adjusting nut to make a driving fit for a 1/16” pin about 5/32” long. File the outer end of the pin to a trian- gular shape with vertex pointing to the nut. Now get a jeweler friend to engrave ten equal divisions on the face of the knurled nut, numbering each. For finer adjustment, use the knurled points for setting marks. The pen can be opened for cleaning at any time.—J. A. Emmett. | Pencil Sharpener Honed With Sandpaper "f WEEN a pencil sharpener literally chews up a pen- cil instead of cutting it cleanly, the cutters need re-sharpening. A simple hone can be made in a few minutes from a small piece of very fine sandpaper or emery paper and a sharpened pencil. Cut the abra- sive material into the shape of a quarter-circle, then securely glue it over the pencil point. Insert the hone, then turn the pencil sharpener backwards for a brief interval..—A. V. Kobza. J | | : INSERT HONE rf AND TURN HANOLE BACKWARDS Drawing Instruments Stored on Shade SHADE with roller mounted above the drafting table comes very close to being the ideal method of storing drawing instruments. Pockets and loops sewed to the lower end of the shade provide room for drafting tools. Entire shade is easily raised should draftsman prefer to stand up for a time.—J. E. Hyler. Handy Block SESAR Gi P m t TO WINDOW SHADE tives rom NK, ROTATE PENCIL HOLDING . iT GENTLY BUT FIRMLY to Pencils AGAINST INNER SURFACE OE ARTENA Boe KEEBING a sharp, true point on pencils is one of the minor annoyances of the drafting table. Write Hote rae)? ¢{¢4| The sharpening block shown in the sketch at left ih 2 i produces a sharp even point with great ease and i Pe i speed, but is small enough to be fastened directly ; i j ; | to the drawing board. Roughly sharpen the CARDBOARD ORTH A NF pencil in the usual manner, then twirl the point ; a f ‘fi JÀ inside the block, taking care to maintain an even pressure.—D. Rolfe. SANDPAPER | 8 1 l | Simple Ink Bottle Holder ‘A COMMON tin can about two inches in diameter can be quickly made into a simple yet practical ink bottle holder for the drawing board. Cut the can down to a height of about 114”, then punch a small hole in the center of the bottom. Fasten the can to the drawing board at the most convenient spot, using a large thumb tack. The bottle may be readily wedged into its holder with a few strips of paper.—M. G. Winterton. Inventions, January, 1935 109

Page 110

sop Build an 00-Gauge COACH

CARDBOARD SIDES GLUED TO EDGES OF FLOOR BOARD

DIAPHRAGM : STIFF PAPER, BLACK FOLDED CLOTH BETWEEN 4

FLOOR œA |_ OF ig

Side, top, and end views of 00-gauge coach are based upon actual 70-foot railway coach, scaled down at rate of 4 millimeters to foot. Details show how bolster of truck is fastened to floor of coach with single bolt, and how built-up roof fits into the cardboard sides.

Model railroad systems in 00-gauge, using tracks but three-fourths inch wide, can be laid out on an ordinary table. H. T. Nieter, Ameri- can model engineer, shows here just how easy it is to build an 00-gauge 70-foot railway coach.

by H. T. NIETER ITHIN the last few years the 00-gauge for model railroads has attracted the attention of many who, because of space limitations in their homes, could not build standard 0-gauge equipment. With tracks only 34” wide, an entire system including stations, tunnels, bridges, and semaphores can be set up on a dining room table, or mounted on sections of wallboard which are easily folded up and packed away in a closet. The American gauge or width of 34” is used for the tracks in this project, this being closer to the gauge width obtained from the 110 4 millimeter to the foot scale than the %” gauge used by English model builders. With scale disposed of, the actual con- struction of the coach may be begun. The materials specified here are the simplest to handle, and are obtainable at a minimum of cost. ' The floor is cut from a piece of 14” thick soft wood. Mark each side at a point 14” from the end, then bevel the corners as shown, leaving a 17/32” flat section for the vestibule. i Locate and drill holes for the truck cen- ters, then cut out the %4”x%” squares on each end for the steps. The sides of the car will require 1/32” cardboard similar to that used by laundries as shirt-stiffeners. One side and end may be cut in a single piece, or the entire side of the car cut at once. Add a 14” tab wher- ever the cardboard ends are glued together. Following the dimensions on the draw- ing, mark out the windows and doors on the cardboard strips, starting at the center of a section and working toward the ends. Modern Mechanix and

Page 111

for Your Table Top ‘Railway s z wood BOLT & FLOOR SCREW AN LLL By. Above details show construction of truck for 00-gauge coach. hile brass is preferable, any other available metal may be / used. When train is in use, bearings should be kept well- Ẹ = P am Vy) oiled to reduce friction. Lay out full size template for steps f- ///ti/f--->-- to dimensions shown at right, then trace out number need- PEH Ma cae ae ed. Make up four or five coaches for each engine used. Cut out the windows in the sides and doors with a razor-blade or sharp knife. At the side doors, recess the card by cutting half-way through from the outside and peeling the layer to give the panel effect of a door that doesn’t come flush with the rest of the side. With the floor on a flat surface, and with its edges coated with glue, stand the sides up, one at a time, against it, pressing them tightly. They may be fastened in place with very small pins until the glue has set. Tie a string around the body now, and let it dry. Although the roof may be purchased as -a moulding, make your own if you want by a “bread-and-butter” construction bor- rowed from the model ship-builders. For this, three pieces 10 49/64” long will be needed; the top one to be 1 5/32” wide by 3/16” thick, the middle one 1 17/32” by w”, and the bottom, which fits inside the (Continued on page 120) Inventions, January, 1935 111

Page 112

Radio Lamp in Modernistic Design Gives Subdued Light

Modernistic yet simple in design is this completed radio lamp with decorated parchment shade, aluminum brackets. ENDING itself readily to almost any furniture design, this modernistically designed electric lamp provides striking but subdued illumination for the radio or highboy. Oak or gum wood will be found best for the base pieces, which are held together by wood screws. Cut a set of discs with the diameters indicated from white pine for- each end of the shade. Bakelite or wood discs are used as shade supports. The two 10” long bracket pieces are cut from %” aluminum, %” wide. If strap iron is used, it should be given a coat of alumi- num paint after bending. The shade is a piece of parchment paper 7”x93%”, rolled into a 7” long cylinder and held together with paper binding tape. Four narrow pieces of black binding tape are glued near the ends to make up the de- sign, and the entire shade then given a thin coat of water glass.

ULTRAVIOLET LIGHT SOURCE FLUORESCEIN SOLUTION

Either neon sign trans- former or auto ignition spark coil may be used with iron ball spark gap as source of invisible or ultra-violet light for flu- orescence experiments, Fluorescein solution gives off strikingly beautiful ra- diance when poured from glass to glass under light. PORCELA INSULATOR: < ARON BALL PARCHMENT SHADE BAKELITE DISCS Dimensions ọf base and assembly of lamp are shown by sketches above, photograph below. Bulb should not be larg- er than 40 watts. Glue felt to wood base, after finishing in jet black enamel. Glue bakelite disc into one end of shade. Stunts With Ultra-Violet Light B PASSING a high-voltage spark between iron clectrodes, a source of light rich in ultra-violet rays is available for staging beautiful exhibits with invisible light. Iron balls are fitted to the ends of two short metal rods, and these in turn mounted in the binding posts of bee-hive type insula- tors. The spacing between electrodes is ad- justed after they are mounted in a wood box, until a spark coil or 8000 volt neon sign transformer will spark across the gap. In a darkened room strikingly beautiful effects are produced when various sub- stances are held under the iron gap. A tablet containing quinine, dissolved in a little acidulated water, glows with a blue fluor- escence. A solution of fluorescein poured from glass to glass gives a vivid effect, while uranium chemicals, anthracene powder, luminous paint, and dyes also glow. By placing a sheet of window glass be- tween the spark and some glowing object, the opaqueness of ordinary glass to ultra- violet rays is at once seen. Uranium glass used for green dishes glows vividly. Modern Mechanix and

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“Waddling Penguin” Toy Amuses (Children E HoLe THRU (O) HEAD INTO * t REAR AXL | LOCATION. Here’s “Penny Penguin” ready for a ride across the floor — all dressed up in black coat, yel- low shoes, and gay trimmings. ITH mirth-provoking dignity “Penny Penguin” rolls his owlish head from side to side, waddles back and forth as he is pulled across the floor. “Penny” is a toy, ‘very easy to build, yet a source of lasting pleasure to the child who receives him in the Christmas stocking. From a selected piece of white pine cut out the head and body in one piece on the band saw. Round off the edges of the body, either on a lathe or with a half-round wood rasp, and sand down until smooth. Inventions, January, 19385 HALF SHOWN FOOT LOCATION FRONT axe A Design: of penguin toy parts is easily transferred to wood by ruling one inch squares, Above Fá photo shows ani- i mating mechan- ism which links - to rear axle, Providing waddling motion. x” “Penny” sways back and forth, rolls his head wisely, with varying speed. Adjust wheel bearings carefully to keep friction at mini- mum. Loop axles back through off-center holes in wheels. Now drill a 5/16” hole through the body and partly into the head. Cut off the head, then glue a 6%” piece of 14” dowel rod into it. After cutting out the feet, base, and wheels, parts are glued and nailed together as indicated in the photographs. The lever which turns the head is glued to the bottom of the dowel rod. With one end of this lever anchored to the body by a screw-eye, the head automatically turns as the body sways back and forth. A wire connecting rod joins the crank on the rear axle to a screw-eye on the body. With “Penny” working smoothly, give him a coat of shellac or wood filler, then dress him up with gay enamels. Black head, white eyes, yellow feet and beak, black coat, and white vest are suggestions. 113

Page 114

Russia—Stratosphere Crash Issue OVIET Russia honors, in a beautifully execut- ed set of three stamps, the three youthful martyrs to science who crashed to their _ death on January 30, 1934, after as- cending into the stratosphere to a height never be- fore reached by Only the fact that all instruments aavonouia cep Y Russ stratosphere crash stamp. man. were destroyed in the fateful descent and crash prevents their achievement from set- ting a new world’s record. The central design of each stamp is a portrait of one of the balloonists. Stripped across the background is the partly inflated stratosphere balloon. At right is letter carried by tin can canoe mail from ship to tiny postoffice at Niuafoou, Tonga—remote South Sea isle. Artist’s impression of mail-carrying scene is pictured above. 114 Germany—Hindenburg Death Ba borders appear- ing on six of the recent- ly issued Hindenburg me- dallion stamps mark the passing of Germany’s be- loved president—of the man whom even France, bitterest enemy during World War days, respected and honored. Stamps were run through the presses a second time. Black border was printed on Hinden- burg stamp after his death in August. Tonga—Tin Can Canoe Mail IN CAN ISLAND, remote isle of the Tonga group in the South Seas, still gets its mail in sealed tin cans, but not in the picturesque swimming postman fashion of a year or so ago. With no harbor or landing place, it became necessary to seal the letters in tin cans, lash them to logs, and throw them into (Continued on page 116)

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

* The above letter from California is unsolicited, and is just one of the many letters recelved from enthuslastic users, Guaranteed Gas Savings The VACU-MATIC proves itself on every car. Ie is guaranteed to give worth-while gas savings, quicker pick-up, and more power or it costs you nothing. “On a test I gained an average of 4 miles on a gallon,” writes Alex Wertz. “Vacu-matic is the best I have ever tried.” Clarence Rutzin—“I have tried the Vacu-matic on several tests and find that I get between 5 and 6 miles per gallon increase, have more mileage, have greater pickup.” Free Details Learn about this remarkable device that so greatly affects the entire performance of your motor. Learn why your car is costing you extra money to operate without VACU-MATIC. See why your VACU-MATIC equipped car will leap away from traffic without sputter or hesitation. Discover a new driving thrill and enjoy the savings that more than offsets VACU-MATICs slight cost, Get the facts! Write today! ` O TFREE OFFER COUPON= = = =} THE VACU-MATIC COMPANY | 7617-65 W. State St., Wauwatosa, Wis. l Gentlemen: Please send me full particulars concerning the I Vacu-matic and detalts of your Free Offer. This of course does not obligate me In any way.

Gtatésincsciernccasec -Il — O Check here if interested in selling proposition, Lge cS S aE 115

Page 116

Chicago Fair—Last Day Covers S THE Century of Progress exposition closed its gates officially for the last time at midnight, October 31, thousands of Iéetters sent in by collectors were being given the last day, last hour official cancellation at the two: World’s Fair postoffices. Colored clos- ing day cachets were also applied. ADLETS FOR HOBBYISTS STAMPS STAMPS Sent on approval. 50% discount. Fred Herz- berg, 197 Grantley Ave., Elmhurst, Illinois. ` FREE!!! Oriental Packet and Pocket Album, 5c with ap- provals. Hollystamp, 1710 North Vermont, Hollywood, California, CAICOS ISLANDS—Also early United States, Uganda, Congo’s, Nicaragua, Monte Carlo, Niger Coast, Canada, Newfoundland, and Ubangi — “Countries Collectors Haven't Got? — Free for 5c postage. Hurry for yours, Now.- Empire Stamp Company, Dept. MM., Toronto, Canada. STAMPS! 100 ‘diff. 2c; 500 diff. 35c; 1,000 diff. 90c. Tatham Stampco; D9, West Springfield, Massachusetts. SENSATIONAL Packet: Coreas, Liberia, triangles, Brit- ish Colonials 10c. A. Steele, Springdale, Pa. HEADQUARTERS—Stamp Collectors! Penny Approv- als, Lowprice Sets. Request selection. Elyria Stamp Company, 437MM, Elyria, Ohio. 105 DIFFERENT, Hyderabad, Congo, Guinea, etc., 3c to anproval applicants. Extra—Airmail Set Free with above. Hunzimker, Box 225, Minneapolis, Minn. FREE!!! Russia Ethnographic set or three Spain Air- mails,- Postage 3c. Roberts, 901T Fourth, Baycity, Mich. LOOK! Gorgeous packet including Uruguay (Flying Horse) Airmail, Spanish Airpost, Triangle and ship stamps, only 5c to approval applicants. Royale Stampco, South Pasadena, Calif. 1000 OLD Mixed Stamps 25c. Smith Bros., Bamlet Road, Royal Oak, Mich. TRADE or Swap Your Duplicates! Popular New Method. Write today for Free information. World Wide Packet Exchange, Box 745-M, Beverly Hills, California. SPANISH Ships and 50 different, 3c with approvals. Tupper, Federal St., No. Wilmington, Mass. COINS HTGHEST Prices paid for Indian Head Pennies. Send pe for aut of those wanted. Coin Shoppe, Box 407-MM, Atawa, r 2 UP.TO $50.00 paid for Indian Head Cents, Half Cents $250.00; Large Cents $2,000.00, etc. Send dime for list. Romanocoinshop, Dept. 277, Springfield, Mass. TOP Prices Paid for Indian Head Pennies. Send dime for- catalog- of coins wanted. The Coinmart, B-56 West Washington. St., Chicago, $5 to $500 EACH paid for Old Coins. Keep all old money. Get ‘posted at once. Send 10 cents for Illustrated Coin Value “Book -4x6._ Guaranteed Buying and Selling Prices. Coin Exchange, Box 17, Le Roy, N. Y. FREE—Foreign coin, banknote, and large illustrated coin catalogue—4c postage, Souvenir California gold: quarter size 26c; $14 size 53c; both 65c! Round or octagon, set of each $1.30! Approvals with each order. Tatham Coinco, West Springfield—9, Mass. WE BUY 1907 Indian Head Pennies. Send dime for prices. Bencoin, 206 Broad, Bennettsville, S. C. OLD MONEY Wanted. $5.00 to $2,500.00 each paid for old coins. Buying catalog 10c. Robert Cohen, Box 483, Muskogee, Okla. CALIFORNIA gold, quarter size 27c; $%4 size 53c; 100 different stamps and catalogue coins & stamps 10c. Norman Shultz, Salt Lake, Utah. 116 Santa Claus Mail Goes to Indiana Here are Christmas day postmarks which collectors can obtain for albums. Christmas Island cancellation on Straits Settlement stamp came from: tiny isle in Indian ocean, 200 miles south of Java. Off west coast of Nova Scotia, Canada, is_settlement from which “dime size” cancel was sent. (Dates were changed to Dec. 25, as shown, by staff artist.) HERE is a Santa. Claus town—but it’s not at the North Pole! Each year holi- day mail clerks route thousands of Santa letters, dropped into corner mailboxes by hopeful little fingers, to the little-known town of Santa Claus, in Indiana. There, after the holiday mail rush has dwindled away, the postmaster and his wife open each letter. To this postmaster, too, come requests from parents, asking that letters addressed to their children be given the Santa Claus cancellation. Annually thousands of chil- dren thrill to genuine letters sent them by Santa—for who can doubt their authenticity when even the cancellation is correct. _. A collection of Yuletide postmarks makes an interesting page in any album. December 25th cancellations can be obtained from the two U. S. Christmas towns—in Arizona and Florida, and from the three Christmas Islands in the world, by sending stamped; addressed letters with your requests to post- masters at the different places. Tonga—Tin Can Canoe Mail. (Continued from. page 114) the water where natives would push them to shore. Hungry sharks so endangered the postal force of the island that canoes were provided for the postal force. Normally W. G. Quensell, Postmaster, storekeeper, and copra trader at Niuafoou, receives about 200 letters a year. Since the shipping line serving this point has allowed stamp collectors to mail letters to them- selves from this tiny postoffice, more than 15,000 letters were sent this year. Thonk You for Mentioning Modern Mechanix and I nuentions for January When Writing to Advertisers

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BLANK CARTRIDGE PISTOL REVOLVER

BOYS! THROW YOUR VOICE Into atrunk, under the bed or 5 STYLE S anywhere. Lots of fun fooling peo Ma eae’ TEE LY, teacher,policemanorfriends. 59 EED | iyt 255,500 and $ P: St.00. Well made N FYE | and effective. Modelled on pat- FR a| |iern of lastest type of Ravolver. Tan Appearance slone enough to scare a P burglar. Takes 22 Cal. Blank Cartridgos obtainable everywhere.

è . i Greut protection against burglars, trampa ; i ib Iyi d wi h a pee Hunni fits fe as ` $anege int To Emer revolvera Fie or ath July, New i catia, fot stage work. starting pistol, eto. mouth out of sight, used wit SMALL SIZE 4 in. long 25c. MEDIUM SIZE

above for Bird Calls ete. Anyone can use it. over 25 miles, or under favorable con- a i goomcerte, i. 3 fı thi ditions up to 100 miles. Constructed besaba ji M 4 wont an ae of the fineat materials throughout, games, mar- (i oluding, superaensitive crystal, asaur- ket reporte, uiek results. PRICE of Iceceiver only $1.00 postpald. Or complete ar Phone and Aerinl Kit—everything all complete—nothing more tof’ visi Also Becond Sight, Shadow-|P, I Slo Second Sieht Shadow” |buy, $2.95 postpald. JOHNSON SMITH & CO., Dept 619, RACINE, WIS, lee ew ea tial 100 postpaid. 2 RADIO SETE" shows bow to mobo und 125 CARD TRICKS snd sleight of hand. cC H A M E L E Oo N S 5 c operate inoxponsive Radlo Geta, the ma- | comveins ill the latest end best cofd tricks as terials for which ean be purchased for a mere | Dosure of card tricke used’ by professional LIVE, SAFE DELIVERY GUARANTEED Receiver for bringing In forelon. stations, | ables. Price 250 pontpold, i > ; police calls, ships at aea, eto. ONLY 15c ppd» | SNAPPY sokea. A splendid colleaion| Watch it change its color! = a BAS = œa — c | of rich and rare joken compiled by a joy bartender for stag parties, smokers, etc. 100- FORTUNE TELLING BY CARDS, dice, dominoes, crystal, ete. Gives meaning of every card, how to deal and lay them out, elo. Price 100 pastpald. š he i Water LEARN TO HYPNOTIZE, Book tella how |Get one of these most wonderful of all creatures. Watch it change Pistol—very latest to hypnotize, how to produce alee ow tolits color. Study ita habits. Wear one on the lapel of your coat as design; looke just paken e pubiect, medical hypnotism. hypno-/a curiosity. Watch it shoot out ita tongue as it catches flies and in- | like a Police revolver. cte. Price 100 ‘postpeld. ypnotize animais, | sects for food. No trouble to keep. Can go for months without Blue steel finish. Squirts 25 food. Measures about 4 inches in length. Shipped to any address feet. When diluted ammonia © in U. S. A. b; il. We guarantee safo arrival and live delivery. ia usd is very effective against STAR TOY MAKER PRICE 25 CENTS POSTPAID. vicious dogs, tramps, animals. 7inches w hi: naa book ee ee ritten. al ine: SEICE Be POSTPAID, ieee BIG ENTERTAINER! model Rallroad, a Tele-; aes pa ms eA egga, bottles, string, ete

Repeating

Put PHOTOS on Silk, hone, Boomerang, Tele- ji Cl . Praph’ Instrument, Bo x w= 326 Jokes and Riddles. 25 loth, Wood, Paper, s ite. Talking Machine. |EN IC pie 3 Magio Tricks, 10 Parlor Microscope. Electric G Games, 73 Toasta, 13 hen, etc k y a Motor, Electric Door, Bell, | RSA = Fairy Tales, 105 Money- THIS EASY QUICK WAY Water Wheel. Paddle Raft, a pslr of Skis, : i making Secrets, 22 Mono- a Dog Sied, Bird House, Rabbit Yard, ete. | BENS ings, 11 Parlor Pastimes, kerchiofe, scarfa, tiea, hosiery, | to bring good luck. Price 15c postpeld- [19 Flirtations, 1119 Girls’ and Boys’ Nemes end their Meanings, 10 Picture underwear, paper,wood, linen, | DREAM BOOK AND FORTUNE TELLER., |Puzzles, 69 Amusin i ej t x 5 e Rhymes, 37 Amuaing Experiments, Desf snd Dumb Witt The photos Tab ieee Rea een en With arate R: Alphabet, Shadowzraphy. Gypsy Fortune Teller, How to Tell Fortunes with lasting. Easy todo. Just foe dreams and interpretations, lucky numbers, Cards, Dica, Dominoes, Crystal, Coffee Cup, ete. Hypnotism, Ventriloquism, low few simple directiona. One bottle is good for about i i Cut-outs for Checkers and Chess, Domi „n Fox and Geese, 9 Men Morrle, a ee ae e Bpanieh Prison Puzzle, Gore. ot oecrans. 28 Card Tricka Crvetal Gazing, ote Te = ge book tells = 50 prints in RICH TONES. | how to make different knots, hilches, spli AL Thoroughly practical, . 100 illustrations. Cy Price for pA AR ten E Outfit, oniy os plete S-MINUTE HARMONICA COURSE. A a postpald. new easy self-(eacling method. ‘feuches how -M

play, to une the toncue Good Multrated” Price 150 posipa REPEATER -12 SHO

LEARN TO DANCE. Book contains full in- H atrugtione in eld and new dances. derstood. PRICE 250. Luck WONDERFUL X-RAY TUBE E Heroit is, boys. You A wonderful little can bave an immense instrument pro- Á amount oft fun with this new ducing optical s j 2 4 pistol. Itshoots 12 to li ordi- illusions both nary peas without reloading. surprising and 3 4 č All you need do is to load the Very striking, quaint and uncom Sil cl startling. Withit) & 5 3 x gun ie peas, pull the. {pieger H P mon. Silver | E Anish; skull and orosabonea design, two brile | your fi 7 pear nT pene aha ee Be z 3 barrel Ss’ empty. ‘hen reload |

Essily un-

liant, Mashing gema sparkle out of th i ; 7 2 A Said to bring good fuck. Only 250 pod. "| similar ilunions, Prier, IOo: '3 for B8ep-bde BIA races eat cafe, Nothing to PEEN à explode. These pistols sell like es ‘ JOHNSON SM & co. ay ae hot cakes, so get yours ATI VURE Dept. 619 3 ONCE. Be the frst boy in RACINE, WIS. 2 : A your town to own one of these pA automatic repeating pistols and 4 be the envy of all the other z 5 kids in the neighborbood. econ | v z PRICE ONLY 25 CENTS i POSTPAID. JOHNSON SMITH & CO., Dept.619 Racine, Wis. tco- WACIME wis. Thank You for Mentioning Modern Mechanix and Inventions for January When Writing to Advertisers 117

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Turns Spare Time Into Money! Up to ‘40 a Week! without Leaving the House We show you how to make big money decorating fast-selling Giftwares and start you off with the big, complete $10 Artist’s Outfit shown above. Also Free Idea Book that has started hundreds of men making big, easy money. One Fireside Member says, “I made $100 on furniture in one week.” Another writes, “My sales were $500 for 5 weeks. This is my first year.” R. M. P., of Illinois, says, “I did $3500 worth of business last year and over $12,000 this year.” D. W., New Mexico, reports, “I would not take $1000 for my Course.” lf you really want to make big money, a guaranteed income epportunity is now ready for you with Fireside. No tire- some study. You learn by doing. You make good money Our FREE Book tells you how. NO SOLICITING.-..-- NO CANVASSING It’s easy to dispose of everything you make. Our new ‘‘ Automatic Salesman” does all the selling for you. ‘This vendor is designed to quickly find cash buy- ers for all the Giftwares you can turn out! No soliciting or house to house canvassing required under this method. Nor do you need any artistic ability in order to succeed. Simple ‘‘3-Step Method’? makes the work easy to Jearn and easy to do. Under new Plan your membership need not— should not—cost you a penny. Get full details. Coupon brings everything. FREE Book on Decoration Mail the coupon NOW for the heautlful new Book on decorating at home for blg money. A new Plan that gives you a quick start included free, Mail coupon now while openings for new mem- bers are still be- Ing offered. FIRESIDE INDUSTRIES Dept. 142-A Adrian, Michigan ae ee eee eee ee eee Fireside tndustries, Dept. 142-A, Adrian, Michigan Send me FREE Book- on Home Dec- orating for a blg steady Income. Also how to get the big Artist’s Outfit. practically from the start. Send the coupon for it. Secrets of Radio’s Sound Experts (Continued from page 69) flakes or cooked macaroni produces a sur- prisingly realistic effect. A few sound engineers can imitate a jungle full of monkeys—if they are provided with wet corks and bottles. They rub the wet corks on the bottles, and the moods of. the monkeys vary according to the amount of pressure exerted. One mystery thriller called for the splitting of the victim’s head by an ax wielded by the villain. The studio and laboratory was a shambles when the sound engineers finished their experimenting. Armed with axes: they went about splitting everything available in a frantic effort to find a sound like a head being split. Finally someone requisitioned a head of lettuce and split it with an ax. Almost right. Try a head of cabbage. Perfect! Fisticuffs on the Air Waves When the hero belts the villain, and you hear the thud of heroic fist against sneering jaw, the hero has struck his fist against the palm of his hand. To crack an egg, a piece of cellophane is flicked with the finger. A metal strip is attached to a tambourine —with the bangles removed—and the metal snapped against the drum head to produce a pistol shot. For a larger calibre pistol or a rifle, a larger tambourine and‘ metal strip is used. To reproduce the sound of a cannon shot a tympani, or bass drum, is struck. Thunder crashes are reproduced by striking a tympani with a softly padded mallet, or by shaking a large metal sheet, called the “thun- der sheet.” One of the most difficult sounds to repro- duce is falling rain, as it sounds like static. Mr. Kelly used to crush excelsior close to the microphone, or gently rub a scrub brush over a piece of window screening. Now the usual means is to drop sand from a perfor- ated box onto a sheet of cellophane. If the rain is supposed to be “swishing,” the cello- phane is held at an angle and the sand allowed to slide on it. If the rain is supposed to be falling on a tin roof, a sheet of tin is substituted for the cellophane. A metal cylin- der containing lead shot is revolved to ‘pro- duce the roar of the surf. i Staging a Jungle Battle f In a recent broadcast the sound engineers were called upon to produce a battle between a cobra and a mongoose. They knew the cobra was dumb, but didn’t have any idea of the kind of sound a mongoose, fighting for its life, would emit. After much research, they found an explorer who had actually seen a death struggle between the two creatures. The sound engineers were appalled when the explorer told them that the mongoose was also dumb. They put their heads together, studied pictures of the mongoose, and decid- ed what kind of a noise they would make if they were mongooses (or mongeese) fighting for their lives. Finally they decided it would be something like the squeak of a rat. They had to have a sound, for a silent fight would not mean much to the radio audience. A rubber doll that squeaked when pressed, was Thank You for Mentioning Modern Mechanix and Inventions for January When Writing ta Advertisers

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8735 Bench Saw 21.95 as shown : including new self- indexing miter- gavge, and 72 page book of instruction. 1214 Berchman St. Secrets of Radio’s Sound Experts utilized to produce the cry of the mongoose. If the script calls for a jungle native to shoot an arrow through the heart of his enemy, the fans produce the swish of the arrow through the air. The piercing of the heart of the victim, horribly realistic over the air, is merely a reed being thrust through a head of cabbage. The native rushes to scalp his dying enemy, crashing through the tangled underbrush. Snapping twigs, however, sounded like pistol shots through the mike. So a whisk broom was taken from the coat closet, the straws squeezed and released and brushed against the hand. Crackling underbrush? Close your eyes and try it. Mr. Kelly has found the whisk broom invaluable. It does the work of an entire forest and in his deft hands is the rustling of leaves, the swaying of boughs, the crackling of underbrush or a prairie fire. Sound technicians develop a “mike ear,” just as the artist develops an eye for color or line, as the sculptor singles out a beautiful head or shoulder from a crowd. Walking down the street, the sound tech- nician hears an unusual noise. Immediately he associates that sound with another that he has heard, tried to reproduce. He immediate- ly investigates, finds, perhaps, that it was a squeaking shoe, the sound of a coin dropping on concrete, the scratch of a match against a window pane—and another sound effect to “fool” the mike is horn. Thank You for Mentioning Modern Mechanix and Inventions for January When Writing tə Advertisers New 72 Page Instruction Books are included with every major tool and sold separately at 50c each—$1,50 for set of 4. First ones of their type available. Books in this series: The Bench Jointer & Shaper, The Drill Press, The Lathe, The Band Saw & Jig Saw. WALKER-TURNER, CO., INC. Plainfield, New Jersey Obtain from your Loca! Dealer or Write Direc $ Wealth in Virginia’s New Gold Rush (Continued from page 49) The entire piece of property takes in about 9,000 feet. Of this only about 4,000 feet is being mined today. The Vaucluse mine is at one end and the Melville at the other. Here’s what the visitor to the mines is privileged to view, feel and hear: A slimy ore bucket drops quickly down the entire length of the 220 foot shaft. Work- ers can see what’s going on only by the dim glow of carbide lamps. Always is heard the monotonous beating of pneumatic drills which open up gaping holes in the face of the drifts below. E Blasts Reveal Golden Wealth As if the noise from the pneumatic drills and water pump were not enough, every half hour or so you hear another deafening roar. This is a powder blast, carefully placed at some strategic point to reveal another gold- filled face. Thus far, about 1600 tunnels have been built along the vein containing the precious gold, blocking off about 60,000 tons of ore. Granted that all the ore lives up to its pres- ent estimated production value of $5 a ton, then about $300,000 worth of gold already has been blocked off. Hoyt Barnett, noted Washington, D. C. mining expert, describes the set-up: (Continued on page 124) 119

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defy an ote Crees a You anaana. CANT BEAT N Aee ae OUR PRICES anteed to give full 12 months’ service undar by the entire Sranciat reqguncee uf ar iioa company. Order Now at Today’s Lowest Prices. : BALLOON tines Reg.CORDTIRES Site Rim Tub Si: abet: scat ta RARE: a Saarega e $2. 2. 2. 2. 2. 2. 2 2 2 2 3. 3 3. B 3. E% AADUUNDVORDNR Aita T wgouguuacuacuon, OS Ot bat tat baat tat pat ot St ES O LD Ca 3 Pesaaunanaas, em memener, pa $4.25 $1.95 32x6 7.95 2.75 Bax $ 19. 25 3.95 x6 95 3.95 ‘| 36x8 12 345 4.25 ws ~ wi =s P 40x8 15.95 4.95 WE WANT. #3 | DEALERS All TUBES GUARANTEED Brand New 2 em SED SEND ONLY $1 DEPOSIT on each tire. (On each Truck Tire send a $4 deposit.) We sbi balance C. O. D.,5% discount for full cash wi order. Any tire tailing t to ive 22 months’ service will be replaced at half price. GOODWIN TIRE & RUBBER CO. 1840 S. MICHIGAN AVE., DEPT. 1402, CHICAGO, ILL, | BRAND NEW TUBE OR ““RAY-O-VAC"" LANTERN WITH EACH ; _ORDER FOR 2 TIRES RLD WIDE NOTE: RADIO Get stations all over the world with this POWER- $ 95 FUL radio ‘receiver! All Wave—15 to 600 meters! Works on two inexpensive batteries. NOT a toy or attachment Results ‘Guaranteed? GIVEN WITH EVERY TIRE Ace kita include all two tube house curren needed! Complete kit—$3.6' ibes 8Sc ea, Doub! lsheadphones Si. 25. PRD ËR NOWI Send $1. deposit, or postpaid if ittance. Send for litera: FREE His Largo ies S polar map of the WORLD,- valuable Short 1 Send 10c for handlin; ACERADIO LABORATORIES pept-mxa 1619 Broadway $500 CASH PRIZES—See Page 44 Post YOURSELF! It paystI paid J. D. Martin, Virginia, $200 fora single cop- Percent. Mr. Manning, New York, $2,500 for one silver dollar. Mrs. G, F. Adame $740 for & few old coins, I want all kinds of old coins, Medals, bills and stamps. 1 pay big cash premiums. i WILL PAY $100 for A DIME 1894 S. Mint; $60 for 1913 Liberty Head Nickel | (not buffalo) and hundreds of other amazing prices for coins, Get in.touch with me. Send 4c for my Large Illustrated Coin -Folder and further Re articulars, It may mean much profit to you. Write today to B. MAX MEHL, 90 Mehl Bidg. Fort Worth, Tex. (Largest Rare Coln Establishment in U. $.) 120 Build Coach for Table-Top Railway (Continued from page 111) body, acting as a retainer, 1 15/32” by 14”. By the aid of center lines, glue these together in order and put in a vise or in clamps to set. When dry, round off the long edges of the upper two layers as shown in the end view of the car, and then the ends as in the side elevation. Careful fitting will be neces- sary to make the roof set snugly in place. Make Steps From Postcard Stock Steps of stiff paper or very thin postcard stock are quickly made if a template is car- bon-traced from an exact size drawing. By drawing around the template, all steps need- ed can be laid out in a few minutes. Bent and glued solidly, these steps are durable; a coat of lacquer in black or the so-called “Pullman green” will further strengthen them. Diaphragms, those bellows-like vesti- bule connectors, will each require a cut-out “plate” of the same stiff card as the step ma- terial, and a folded strip of thin black or blackened cloth. Glue is the holder for these, too. Leave the steps out of their square cut- outs until the trucks are applied, to prevent wrecking them if the body is set down. Cellu- loid or cellophane glued inside the windows makes a good “glass.” No under-side beam is specified as the car is supposed to represent the latest self-sup- porting type. If you have a different kind in mind fit out the under side of the floor accordingly. Modern Four-Wheel Trucks Are Used In line with modernism, the trucks are four-wheeled. For a while the roads have been using six-wheeled Pullman-style trucks. With lighter cars back again, though just as big and much better, the four-wheel truck has come back. The truck shown in the drawing is not the most-elaborate to be had, but looks well and is easy to make. It con- sists of two side frames and a bolster joining them, cut from about 18 gauge sheet brass, and two pairs of wheels. Wheels can. be bought for a few cents each, but if you have a lathe, make them to the dimensions given. The two bolsters allow the frames .to swivel up’ and down with uneven track. Trucks with actual spring and equalization between wheels work better than this type, but the work is more than proportionately greater. Bolting with 6-32 screws is all right, but file down the heads where they stick out on the sides. A longer 6-32 bolt will act as king-pin. If couplers are added, they will work best when fastened to a long strip of metal with a hole in the far end to go over the king-pin. The center-of-truck pull de- veloped permits closer coupling of cars and makes for better action on curves, with Jess swing between them. Paint should be flat, not a lacquer, on the body and trucks. Too new an appearance will result from the use of a shiny surface; since the cars won't have a chance to weather it off, the rolling stock will not resemble actual equipment. A good. color ecombina- tion is deep green with gold lettering. Thank You for Mentioning Modern Mechanix and Inventions for January When Writing to Advertisers

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Who else wants to learn to play, at home without a teacher, in 14 the usual time and 4 the usual cost? VER 700,000 men, women and children have learned = to play their favorite instruments the U. S. School of Music way. That’s a-record of which we’re mighty proud! A record that proves, better than any words, how thorough, how easy, how modern this famous method is. Just think! You can quickly learn to play any instrument—direetly from the notes—and at an dents or pers _ School course ee ee average cost of only a few cents a day. fashioned, plodding methods. à , you really want to learn to play at home— You study i in iad own hone hat te simply eat t without a teacher—in one-half the usual time = go wrong. first you are tola what to ao. ena —and at one-third the usual cost—by all means | S ozan picture shows you how to do it. Then you do it send for our Free Descriptive Booklet and Free yourself and hear it. Demonstration Lesson AT ONCE. No obligation. U. S. SCHOOL OF MUSIC, 2621 Brunswick Bldg., New York City. Fun—Po ularit Se ee ee LEARN TO PLAY You'll never PPs what oon U.S. SCHOOL OF MUSIC BY NOTE times are until you play some 2621 Brunswick Bidg., New York City 2 es musical instrument. If you can Send me your amazing free book, “How You Can Master Piano Violin play, many invitations come to Music in Your Own Home,” with inspiring message by Dr. Saxophone Guitar | you. Frank Crane; also Free Demonstration Lesson. This does Ukulele . Organ Never before have you had not put me under any obligation. na Banjo such a chance to become a mu- tawanan. Guitar sician without the drudgery and INE i nae ecrorios s sears 6 Assay Aa eanerh i aua eS oe Piano Accordion expense that were such draw- or any backs before. PRO GEGSS: adira krenn EAAS INRENA wa Saees AAS CEET other instrument Little theory—plenty of ac- Have you complishment. That’s why stu- Instrument ....-...-.56. re eee „Instrument ?...... i va D AFRONT DRIVE! || MAKE MONEY| Send own midget front drive stamps i auto, for racing or sport use, for Casting Lead Toys with the simplest drive, using further i $ T” Ford parts and few tools. : details. we the tne plans ooy avail- ‘ Ta, able is 4 wheel brake, front drive, can be built at home, Gig cays. Bee AA TA using your motorcycle motor Tor fares oldirar. figures i in each ontht. Cast all and other car parts. Ina fascinating! "and you ean earn hando rofits selling thei toys. Ask dealer for # R CASTER, or send $2.50 money order and outfit will be mailed (postpaid in U. S.). State choice of U. S. Soldiers, Wild West Cow- boys, U. S. Machine Gunners. Large ilus- trated Casting Book sent FREE on request. economically. E. A. BORNTRAEGER Rapapo rt Bros. 3450 NO. MARSHFIELD AVE. "aces 717 W. Ohio St., Chicago CHICAGO, ILL. New Motor Sieds READY / for Home Building from Plans, Parts or Complete KITS e Now you can easily build MEAD’S new, streamlined “OUTBOARD” Power! SUPER SLEDS at home from drawings, parts or com- plete Construction Kits. Low cost. Amazing speed! with our new Progres- Pay As You BUILD “ie Gous Plan. PARTS and SUPPLIES: Complete line of counter- shafts, bearings, gears, chain, pulleys, belts, chocks, steering equipment, pro- e pellers, spruce, cable, turnbuckles and other “speedcraft” needs. Ask for Catalog No. 5. Made without the extensive machine work found in carsof this type, this “‘Sil- ver Bullet” can be built by almost anyone and most “CYCLONE” Uses a Mo- ANY OUTBOARD Mo- RUSH 10c for Motor Sled Catalog No. 3. Hurry! torcyele Engine! Most Sat Bite vag a ee MEAD GLIDERS a Ra “WHIRLWIND” — Uses and get the greatest MEAD product — so you thrill you've ever had! 12 So. Market Dept. M-1 CHICAGO know it’s the BEST! Thank You for Mentioning Modern Mechanix and Inventions for January When Writing to Advertisers 121

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am LOS ANGE LES Enjoy delightful winter in. California. Learn all branches Auto Repairing and High speed Diesel op- eration. Trained ‘men in demand. teach you to qualify for good jobs. Practical: shop. work. Most modern million-dollar school: Big- ‘staff, individual instruction. Oldest, largest trade school in. West. Est: 1905. Earn room and board while rning Free employment. service. Mail-coupon for: FREE. BOOK. ae (PATSA 20 AUTOMOTIVE SCHOOL Figueroa St., Los Angeles. Eend. Free roo Bask snd Details of Auto-Diesel Course. Name. Addr City... 500 POWER MICROSCOPE NEW 500X SUPER-POWER BROWNSCOPE $3- 95 The QUALITY microscope of ultra-high power at low cost. Magnification, 75X to 500X. All refinements; Rack and _ pinton focusing with TWO adjusting wheels, Tilting any angle, with locking lever, Compound objective and ocular lenses. Substantially and precisely made, Absolute satisfaction or money back in 5 days, With directions and slides. Only $3.95 postpaid. Same with wood carrying case, slide- making and dissecting equipment. Only $4.95 postpaid, 600 POWER MICROSCOPE Triple Objective Brownscope $g-50 “Professional” 100X to 600X in six steps. Power varied by rotating the dust proof three objective nose-piece or by adjust- a ment of the eyepiece. Fine rack and pinion 2 wheel = focusing. Large concave mirror. Tilting any angle, with locking lever. Machined brass parts and nickeled tube. 500X—$3.95 Finest quality, With wood carrying case, slldes, 6 plece set of instruments and directions. Only $8.50 postpaid. BROWNSCOPE MFG. CO., Dept. 58, 234 Fifth Ave., New York $500 CASH PRIZES — SEE PAGE 44 Speclal Offer: Coach railroad fare allowed to L.A. from any part of U. S. Bea Civil Engineer! Cyclopedia of Civil Engineering Earn 7 eat volumes. $5000 WA po Gua mart a Year—and Up! TA are wanted NOW. Enormous coll engin spent in fed fF kinds of public 1,600 illustrations. New Revised edition by twelve of America's greatest engineers. Includes: Surveying, worka and not a alri ime a nepert until the Engineer i jani en He must direct bridges. Tit 1EO ads i has prepared my ao big "ih, fn there are not enough : T men to go aroun: here you go, you Bee nicipal engineering, road work going py and newer systems water supply, road being built — vast projects of all kinds, ere ia t the necessary trainin, NOME ae ste tae ‘books are comp leto an and t one can UN Spanish Grain Flex- ginply wr ea our: anyon ‘amination plan, Meil ible Covers Gold the coupon without obligation. Stamped American Technic d paikan Drexel | at 2 Lo an e d merica echnical Socie Free! ia Dept. C1320, “‘Drexelatsbth St., Chicago yant to, opedia for the CIVIL ENGINEER, prove 7e lope ip for aya 3 Sera E E wp oles our apars: time; And bo- nothing for the loan o: ausa no description: hers thin 10 daya. If] wleh to |. could do it justice, to let you see for yourself the scope end simplicity, the ‘authority and quality of this great home reading coures, Cost and terms sro within your reach. Send ‘just mail the building, ete. Attach. letter stealing age, occupa- ‘on, employer’s name and address) no money— j coupon. 122 Print Photos in Color on Metal Gifts (Continued from page 103) warm, but not hotter than the hand will bear. Within two or three minutes the gelatine will have dried down into a shiny film, and it can be placed in a print frame under the negative. The exposure is made about 20 inches from an open arc lamp, and will require from one to three minutes. You can also use direct sun- light. In either case, make a note of the time for future guidance. The exposure is correct when you can see a faint brown image of the picture on the coated copper. If you do not give the correct exposure the first time, wash off the copper (again polishing with pumice) until it is clean, and coat it with the gelatine. The exposed copper is removed from the printing frame, in the yellow light, of course, and placed in a pan of cold water. This will wash out the orange chemical in the gelatine, Now place the letter holder in a pan of tepid (not warm) water for several minutes. You can then drain off the water and remove the surface moisture by a very careful brushing with a wad of clean, slightly damp cotton. Have ready, beforehand, a glass plate on which you have worked up a bit of printing ink with an ordinary hand printing or proof- ingroller. You can borrow one from your job printer. Ordinary printing ink can be used, but if lithograph ink is available, use it. Inking is done in white light. Pass the inked roller over the moist gelatine surface again and again, until the picture appears in the density you wish. It will be clear, with every detail showing. Allow the picture to dry and then spray it with clear lacquer. Riding Skyways With Barnstormers (Continued from page 75) l ered outfits that have turned barnstorming into a modern industry. Mel’s Ford tri-motor and Waco J-6 are known from coast to coast, and when Mel sets his flying factory down into an airport, the local pilots declare a holi- day just to watch real flying artists at work. “Besides the two ships, we use a sound car for the ballyhoo,” explained Mel. “The two ships and the car are our tools. Weve got the best talent I can assemble and our flying work bears the stamp of authority, a very necessary thing in creating confidence in the flying public. Swanson’s Barnstorming Personnel “The man in the sound car, who has mod- ernized the old sideshow barker’s methods, is Paul De Weiss. How that man can sell rides after we’ve shown our aerial stunts! “Then there is Sergt. Richter, my co-pilot who pinch hits in great shape on the longer excursions we organize, and Billy Morgan, another top hand, who knows the passenger hopping business and his airplanes too. With talent like that you’ve got a real air show— and the public likes it, plenty.” Before going to work in a community, Swanson makes a complete survey of the ter- ritory. He knows all about the population, percentage of unemployed, has tabulated the pay days of the important industries. He (Continued on page 125) Thank You for Mentioning Modern Mechanix and Inventions for Janucry When Writing to Advertisers

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Lighted Decorations for Christmas (Continued from page 95) against the blue sky. Tack a scrim or net screen of theatrical gauze over the front of the shadow box. On this paint with bold letters a greeting such as “Merry Christmas” in such a way that the thread only is colored and the fine mesh is not closed with the paint. Use five 50-watt lamps in the footlight. Plug this cable into a socket in which a flasher button has been placed. Paint the outside of the box and trough gray and drape the bottom edge with gray cloth. When the foot lights are on the greeting is flashed to your neigh- bors; when they flash off the scene behind will mysteriously appear. Shadow Box Fits in Window The shadow box, Figs. 3 and 4, is intended to fit against the glass of a window from the inside. Figures are drawn and cut out ás Mount the Wise Men 2” from the front edge and the City of Bethlehem.. 3” behind that. Cut out the star and rays for. the background, cover with yellow tissue on - described before. the back, and mount a tiny light to shine through. Three 25-watt blue lights on the floor between the background and the cutout . ef the city, and one amber light behind the Wise Men are used. Paint the background navy blue, the city white on a mountain of dark brown, and the Wise Men black. A 10’ pole painted- black, with a large screw eye in the top, is the basis for a “Treeless Ghristmas Tree.” Stretch wires from the screw eye to the ground in a circle 6’ in diameter, String outdoor Christmas tree lights along these wires to within 3’ of the ground. Mount a star and light at the top as shown in Fig. 7. The secret lies in using a great number of lights staggered along the wires, and. in placing this away from the street against a dark background. Giant Candles Are Effective on Lawn Giant candles, Fig. 8, are used in pairs be- side entrances, on porches, or on lawns. The frame work of the candle is covered with single-faced corrugated board. While time itself dates from the first Christmas, we moderns must have our trees in the modern motif.. The base and standard, Fig. 1, is constructed according to dimen- sions and directions shown. The frame for the base and the trunk is covered with single. | faced corrugated board to which black oi cloth is glued. ‘The star (see Fig. 2) is made from a coat hanger; it also serves as a holder for a light socket. Truncated pyramids of double faced |- corrugated board are constructed according to dimensions given in the detail of Fig. Ia. ‘Tf you live in an apartment and have no fireplace on which to hang your stockings you can build your own very easily. The frame is 2” x2” material constructed as in Fig. 11. Cover with corrugated board to which crepe paper in brick pattern is pasted. Cut andirons from wallboard, strengthen with light wood strips, and nail to the log (Continued on page 125) Thank You for Mentioning Modern Mechanix and Inventions for January When Writing to Advertisers ' Its opportunities are as big in : must know Air Conditioning ' Write for information on the : new, up-to-the-minute course © Correspondence Schools. INVENTION A FIELD OF OPPORTUNITY FOR MEN WITH IDEAS a AIR CONDITIONING the next BIG industry If you have an inventive tumn of mind, this new International Correspondence Schools Course in inventing and pat- enting will teach you all the basic knowledge you must have in order to earn real money irom your talents. The coupon will bring full information, winter as in gummer. Plumb- ing and heating engineers —the field in ite broader as- pects invites ambitious men. on Air Conditioning now offered by the International AVIATION ENGINEERS ` are leaders in modern progress Aviation depends upen engines, and ex- pert knowledge of aviation engines is a long step toward success in this rapidly growing industry. Many leading aviation engineers today took their first step by mailing a coupon to the I.C.S, at Scran- ton. Why don’t you follow their example? RADIO holds great rewards for trained men Almost in a decade radio has become a giant industry. The opportunities created will bo enjoyed by trained men. The International Cerrespondence Schools Hadio Course, pre- pared by leading authorities and constantly revised, will help make you a trained manl A fascinat- ing book—FREE. ` INTERNATIONAL CORRESPONDENCE SCHOOLS BOX 2320, SCRANTON, PENNA. Without obligation, send me full information on subject checked below: O Inventing and Patenting [O Aviation Engines O Air Conditioning- $ Radio DaArchitecture 2 B Highway Engineering CiConcrete Construction Poultry Farming . Ei Mechanical Engineering CI Drafting f} Reading Shop Blueprints [) Accounting Civil Engineering _ El Good English Electrical Engineering H Salesmanship Diesel. Engines O Advertising 7 Gas Engine Operating ClShow Card Lettering O Refrigeration O Civil Service L Chemistry E High School Subjects ~ Name Address — ie ee ae en eee eee, 123

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Wonderful XMAS Gift | The owner of a New Gem Microscope can enjoy a never-ending succession of amezing natural miracles—fantastic monsters in 2 drop of pond-water, battling, feeding, multi- plying—the jeweled glory of an insect’s eye—the fairy lacework of a feather—thousands of hidden mysteries, Made by America's largest optical Institution, Mag- nifles 75 to 172 diameters (lens for 800 magnifica- tions, $2.50 extra). Walnut case and 20.000-word book, “Microscope Experiments,” included. Simple to oper- ate. Money-back guarantee. Ask your dealer. 24-page book, ‘Microscope Hinta,” 10 cents (coin or stamps), IE Write For Free Literature Bausch & Lomb Optical Co., 799 St. Paul St., Rochester, N. Y. MAKE BIG MONEY MOLDING PLAQUES, NOVELTIES, ETC. Get your share of the XMAS Business. We teach you to make your own MOLDS, mold your NOVELTIES and paint them. Sample MOLD only 25c. WRITE FOR DETAILS on our FREE COURSE IN MOLD MAKING. STEWART’S STUDIO, Dept. MM12 2102 West 19th St. Chicago BRAND NEW BUSINESS Make door mats out of old auto tires. Any length or width 2c tire makes $2.00 mat. $10.00 to $15.00 per day profits $ in your home or shop. Small hand machine does it. Don't delay. Write today for full particulars. FABRIX, Inc. Dept. BI 325 W. Huron St., Chicago, III. FOR YOUR XMAS —A MICROSCOPE OF 425 POWER And a beauty... made by lens specialists, world famous for quality. Yields greater magnification (in diam- eters) than other leading amateur microscopes, and so sharply clear that ‘you can make wonderful photomicro- graphs with any. camera...Big. value. for $18.50, and money-back guarantee. At dealers, or shipped prepaid (or C.O.D.). Other models: 70 to 150 power, $12.50; 100 power, $5.00. Slide set, for mounting specimens, $3.50. Catalog free on request. WOLLENSAK OPTICAL CO. 820 Hudson Ave. Rochester, N. Y. 124 Microscope Detects Crime Clues (Continued from page 63) identical with that on a projectile shot from the gun of an arrested suspect, guilt is es- tablished. : Blood films may be prepared upon micro- scope slides where a fresh drop of blood is available. Upon the instant of its appearance this drop is pressed onto a thoroughly cleaned cover glass. A second cover glass is immediately dropped lightly upon this, then drawn off sideways without pressure. After the film left on the glass has dried thoroughly in air, two drops of Wrights staining solution for blood are allowed to stand upon the glass for one minute. Without draining off the stain, two drops of distilled water are added and allowed to stand for three minutes. The cover is tilted to drain off the stain, several drops of distilled water added, and color changes in film noted. The cover glass is placed, film side up, on a blank slide as a temporary support. When the red corpuscles have a salmon-red color, the bleaching action of the water is stopped. The water is drained off, and the film gently blotted with a piece of filter paper. After allowing five minutes for drying, the cover glass is mounted, film side down, in a balsam. Wealth in Virginia’s New Gold Rush (Continued from page 119) “Rock from the exploration tunnels is waste matter, but when workers are in the 500 foot thick vein, the ore removed is hoist- cd to an elevated tower over the shaft and run through the mill. This mill crushes the ore to the fineness of sand and runs it through what is called the ‘flotation process’ for the concentration of mineral values. - “The pilot mill is a revelation to the lay- man. The ore slides into it with a thumping roar. It first goes to a ‘buster’ which makes medium-sized chunks out of the big pieces. Then the ore is delivered by belt to a revolv- ing drum which looks like a concrete mixer. “Inside the revolving steel drum are gigan- tic steel balls, weighing more than 10,000 pounds. As they bump together and bounce away, the ore is broken into smaller pieces. “Emerging from this revolving masticator, the ore is mixed with water and run across a screen. Large pieces are scraped back for another trip through the crusher. Fine pieces, now like sand, wash on to be mixed with two oils, one of which causes a froth and the other an oil-coating around the min- eralized particles. “The froth clings to the oil coating and, by simple physics, lessens the specific gravity of the mineral particles to the extent that they ‘float to the surface. “The mixture of oil, ore and water is sent through a series of cylinders, and at last the concentrate floats off to lie in vats. “After drying partially, the concentrate is baked in an oven until it contains only 1% per cent water. Then it is sacked and is ready for a trip to the smelter.” Thank You for Mentioning Modern Mechanix and Inventions for January When Writing to Advertisers

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Riding Skyways With Barnstormers (Continued from page 122) knows from experience what percentage of trade he can draw from surrounding towns. He has learned the air history of the region, whether there have been any bad accidents of late, how the public feels about flying, and whether they really do have money to spend. “Mining and industrial towns are the best bets, especially on payday,” says Swanson. “Then we clean up. “We hold the stunting talent in leash until late in the day, to hold the crowd when in- terest begins to lag. The tri-motor is gen- erally running from 10 a. m. until dark, be- cause our advance car with its handbills and our local newspaper advertising have given us enough advance ballyhoo to have a crowd on hand. “As against the old method of waiting for lone $5 hops while the cows ate the wings off the ship, we have cut rates to a minimum and are on the go every minute. My peak day was one day last summer when I made 76 separate flights and carried 908 passen- gers. At 60 cents a head, figure it out. Idling Motors Create Business “We draw our trade from the crowds we can pull to an airport. And we want to keep the crowd on its toes all the time, so the motors are left running. We have to charge off considerable gasoline to advertising in this way, but I find it pays.” It is small wonder that the whole barn- storming profession is taking lessons from this young man who has modernized the old game with such a bang. He uses a dash of Pied Piper psychology in his formula plus a round measure of confidence-inspiring all- star talent. He works on the chain store prin- ciple of quick turnover, and he has never had a major accident! He has made more take offs and Jandings than any living man. Small wonder he knows his business! Lighted Decorations for Christmas (Continued from page 123) rests which are of 2” x 2” material, Fig. 12. Toe nail the logs in place as shown. Tack a strip of red muslin to the back of the front log, then stretch forward and tack to hearth. Sprinkle lump alum over this and place a light under it to give the effect of glowing coals. Strips of red and yellow cheese cloth tacked to the logs ənd allowed to flutter in the breeze of a 6” fan will give the effect of flames when lighted Pas red and amber lights from below, Fig. 1 The star, Fig. 9, makes an attractive deco- ration when hung from the eaves of the house or from limbs of trees on the lawn. Mark a barrel hoop into equal sections and bore small holes at each point. Lace light wire or cord through the holes as shown, Fig, 10, forming.a loop in which the light socket is held. When the wire is drawn tight astar is formed with a light at each point. Cover the portions of the wire shown, Fig, 16, with silver or gold tinsel and wrap around the hoop also, to complete the design. Thank You for Mentioning Modern Mechanix and Inventions for January When Writing to Advertisers Uno Model No. 5 Yours for 10 Days NOW -Sises boven Think of it—over 2 million buyers paid $102.50 (cash) for this model No. 5 now offered direct-to- you at way below 1% 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- re 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 refintshed at the very lowest price and easiest terms, AN complete with modern improvements jncluding stanara E mw keyboard, acit spacer, automatic r. on reverse, Leam Touch Typewriting shift lock, 2-color ribbon, ete. Ideal for business and professional men— teachers, students, story writers, ete Don’t let this chance pass by. MONEY-BACK GUARANTEE You save over $60 by quick actlon. These genuine guaranteed Under woods now only $39:90 (cash) while limited supply Jasts. 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 is with- drawn. Remember every machine fully guaranteed and sent on 10 day tria). Learn touch typewriting free! Complete (home study, Van Sant System with thie offer. lance ved Senele SUOUDUATESUODERSR UNDER SRESRTRESS CODD SREDAASSORDRREERAESEORERDES = International Typewriter Exchange W. Monroe St, Ghleago, Dept. 105 m Send Underwood No. 5 (F. B. Chicago) st once for 10 days z trial. If I am not perfecti satistea I ean return it express collect. Tf I keep it I pur pay $3.00 a month until I have paid $44.90

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GO PLACES! with a Z Popularity . . pleasure , . fame . . fortune .. all may be yours when you play a sweet- toned Buescher Saxophone. Easy playing qualities and exclusive Buescher features ` give you quick mastery. Play tunes the first week. .make new friends. . g0 places with a Buescher! FREE TRIAL; Easy Payments on sax- ophone, trumpet, trombone, clarinet—any instrument for band or orchestra, Write now for free Buescher Book — mention instrument which in- TR 49 ` terests you. 1003A U E BUESCHER BAND INSTRUMENT CO. 215 Buescher Building, Elkbari, Indiana Clean Air—Temperature and Humidity Control Increasing demand for heating and ventilating engineers, builders, and salesmen trained in air conditioning offices, stores, theatres, homes, face tories, coaches, industr: d with ite p eat zona study. training {n 6 months, Send TObAY for Free Bulletin. No obligation. Arican School, Dept.AC128, Drexel at58th, Chicago rT p$ SEE P PAGE iun Real opportunity tog etin on ground floor | GET YOUR 1934 COPY NOW! HOW-TO-BUILD-IT Written by experts for AMATEUR SHOP FANS ‘and PROFESSIONAL MECHANICS Crammed with simple, comprehensive plans telling you how to build midget cars, telescopes, radios, canoes, furniture, diving helmets, en- gines, iceboats, cameras, camping trailers, boats and a host of other fascinating projects. NOW on SALE Ae EVERYWHERE Get It Today If your dealer cannot supply you, write to MODERN MECHANIX PUBLISHING COMPANY 529 S. 7th St., Minneapolis, Minn. 126 How to Start Car in Cold Weather (Continued from page 99) Often a battery is discharged so far i in at- tempts to start the engine that its voltage has dropped below that required for igni- tion purposes. No amount of cr anking ‘can then start the engine. Disconnect at the coil the lead running to the ignition switch and battery, and connect in its place one wire from a 6 or 8 volt bell transformer. Ground the other transformer lead to the engine or frame of the car; po- larity is immaterial. Alternating current will work just as well as direct current with the ignition coil, so the car can now be started, either by cranking or with the starter. Let the motor run for a few minutes until it. is warmed up, then shut it off and replace the: regular connections. By this time the battery will have been charged enough to supply ig- nition current for the warmed-up engine.. An extra dry cell will often start a car having a weak battery. Connect it in series with the ignition coil lead going from coil to switch, maintaining the same polarity at the coil. Thus, if the positive of your car bat- tery is “hot”, and ordinarily runs to the coil, the positive of the booster battery should face the coil. Gasoline vaporizes with difficulty in a cold engine. Oftentimes the car can be started merely by applying heat in some form or other to the carburetor and intake manifold. A hot electric iron or a bag of hot sand held against the manifold for five or ten minutes will take away the chill from metal parts. A better method, perhaps, is to wrap cloths around the carburetor, then pour boil- ing water over them slowly. Build This Two-tube All Wave Radio (Continued from page 91) A .1 mfd. condenser isolates the ground connection and chassis from the power line, preventing short circuits which might burn out the house fuses. While a small 10,000 ohm metallized. re- sistor, by-passed at each end by an 8 mfd. electrolytic condenser, is used here as a filter pack, some may prefer to use an old audio transformer or standard 30 millihenry choke in place of the resistor. After fastening the chassis to the front panel with angle brackets, mark the location of each part and drill the necessary holes. Mount the three tube bases, antenna and tuning condensers, potentiometer and phone jack, ‘then begin with the wiring. ` A shield should be used over the 6C6 tube for noise-free reception. This can be bought at a radio supply house for about ten cents. Complete coil winding data has been given for those who prefer to wind their own plug- in coils. Tube base forms can be used for the short wave coils, but these will be far too small for the number of turns needed on broadcast band coils. Shellac all coils after winding to keep the turns in position: ° Thank You for Mentioning Modern Mechanix and Inventions for January When Writing to Advertisers

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Try Small Boat for Big Game Fishing (Continued from page 83) enjoyed by only the select few who claim possession of elaborate cruisers and yachts and who have time and capital to voyage to faraway seas. Sportsmen have come to ap- preciate recently that swordfish, giant bass, and other huge sea creatures are often taken a few short miles off shore. On favorable seas there is no more than a spice of danger in wrestling a swordfish from a craft 16 to 20 feet in length. The tackle used in contesting swordfish, which may ex- ceed 400 pounds in weight, must be strong and reliable. Most marlin hunters use what is commonly termed heavy tackle: a rod of split bamboo, hickory, or other stout wood between five feet and five feet nine inches in length and weighing not more than 16 ounces, and a reel which spools from 400 to 1000 yards of 24-strand line that breaks at not more than 66 pounds dry. Most big game anglers wear a shoulder harness, which serves to support rods during long struggles. Swordfish are ordinarily taken by trolling dead bait—flying fish, bonito, or barracuda from 12 to 14 inches in length. A special swordfish hook, size 12/0 to 14/0, is used on a 15-foot steel wire leader. The bait is trolled about 50 feet behind the boat which is idled down to not more than four knots per hour. Advantage of .22 Rifles for Hunting (Continued from page 82) been soaked in water through the gun. Then in succession use three other water soaked patches and dry with two or three patches. This, of course, is for use in a gun that is quite dirty. After the barrel has been thoroughly dried, run several greased or oiled flannels through it, and finally a greased rag, especial- ly if you are going to put the gun away for a week or more. A dry patch should be put through, however, before you use the gun again to remove the grease. Patches used should never be too large. The patches best ‘to use are three-fourths of an inch square. A word of caution with regard to the cleaning of the rifle might be offered to ad- vantage. In using the steel rod do not run it in from the muzzle, permitting the rod to wear against the edges of the muzzle. Thou- sands of rifles owners do this, the result be- ing that in time there is a slight wearing away of the steel at the muzzle, not much it is true, but sufficient at times to make the firearm inaccurate. Try to clean the arm if possible from the breech, and not from the muzzle. If your gun cannot be cleaned from the breech,. guide the rod with your fore- finger and thumb so that the steel at the muzzle is not worn against. As to whether the .22 selected should be a one-shot rifle, a hammer or bolt type rifle, a repeater or a recoil-operated auto-loader is entirely a matter of preference, and is up to the individual to select as he sees fit. So far as the boy is concerned the single shot rifle is probably the best, in that with one shot. at a time at his command, accuracy is promoted. Thank You for Mentioning Modern Mechanix and Inventions for January When Writing ta Advertisers "YES, I NOW HAVEA Yf“ ILL PREPARE NOW. k | SWELLDRAFTINGJOB. | | IM STILLIN TIME, I'LL |I PREPARED MYSELF || SEND THE COUPON |INTIME. ENGINEER | r DOBE TAUGHT ME | DRAFTING BY MAIL|. mail at home NOW is the time to prepare, It's high time. You don't know how soon business will boom in lines that need draftsmen, When thosejobs areopen, Learn by For ee Ay are Do the big compa- leimo A These TOOLS and other as will take ihes EQUIPMENT enea vas san > H Yo 4 Cae en A pipire NONI c-eaful graduates, that betcer job! obs Now in aviation, electricity, machinery, auto work and certain building lines. Even now all these indus- tries and others, too, are employing draftsmen. How long before business will roll up. big, immensely, with jobs plentiful? BE PREPARED. Jobs pay $50 a week or more. I'll train you until competent and until assisted to a position OR all your money back. With the Dobe method, no previous experience is necessary. FREE BOOK ENGINEER DOBE, Div.47-31, Libertyville, I. Send me your free book “Successful Drafts- manship” and please explain how you will assist me to a good position as a draftsman. 127

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i HTubes New Heavy Gauge rder ‘now before. offer expires. TIRE USERS by the thousands all over the U; S. A. vouch for the LONG, HARD SERVICE, under geverest road conditions of our Don’t Delay—Or SPALLOON Tires. bö ite Ti der Today 2044021 SOAS SOBs [see Goes eel eis 20x4.50-20 PWWN ODDO NADU ANONN SEND ONLY $1.00 DEPOSIT -254į with each tire ordered. ($4.00 deposit -35}0n each Truck Tire.) We ship bal- D cash is sent inpol oP pedere ALL TUBES BRAND NEW — GUARANTEED. Dresa eta ts rive 412 months’ service replaced at half price. ORDER NOW! {YORK TIRE & RUBBER CO., Dept. 4809 | 3855-59 Cottage Grove Ave. Chicago, Hil. Fe wtoW tt WNNNNNNNDN NODS Faq HOO UMNO: EXTRAORDINARY MICROSCOPE VALUE... Student Type. ..... $1.00 A quantity purchase of these fine, imported instru- ments enubles us to sell them at Lhe ridiculously low price of $1.00 each. Durably constructed. Compound ocular tenses. Nickeled tubes. ‘Tilting stand. Adjust- able mirror. Complete with prepared and plain slides, Never before sold for less than several times its Present cost. $1.00 postpaid. 24c extra for C. O. D. =) ALBERT VURE, 307 Throop Avenue, Brooklyn, N. Y. BUILD YOUR OWN FURNITURE Full details in 1935 Handy Man’s Manual Send 50c to Modern Mechanix Publishing Co. 529 S. Seventh St., Minneapolis, Minn. pi HOME CHARGE ; @ NICKEL with the New Hi-Rate IO to 6 Ampere AUTOMATIC HOM GHARGE 2 pruss in any lamp socket. Charges any auto-type battery over- night. Creates no radio interference. Uses no expensive bulbs, “dry units” or messy liquids. Has only ONE moving part, replace- ý able for $1.00, after thousands of hours’ use. The FASTEST, most } EFFICIENT and LONGEST-LIVED home charger made. Ideal b for Battery Station, Garage, Trucks, eto, Money-back guarantee. § Nearly one million sold since 1920 at $19.50 list. “To Charge your BATTERY $ Now, only $16.95 postpaid (or at your dealer), Just insert the dash plug- complete with ammeter, 10-foot cables, desh plug Jhe restis g 4 ete. Write for introductory proposition and AUTOMAT booklet. (Commission Salesmen Wanted). THE AUTOMATIC ELECTRICAL 3 DEVICES CO. : 4, Dept. 4 324 E. Third St., Cincinnati, O, 128 Previewing 1935 Automobiles (Continued from page 53) 12 cylinder horizontally opposed power plant. It is mounted in such a manner that it may be pulled out of the frame on a dolly, just like yanking out a sore tooth. This makes it easily accessible to the mechanic. The pancake engine is an exclusive White creation. This unique design was achieved by opening the angle of a “V” type engine so that the two banks of cylinders, contain- ing six each, are horizontally opposed. The engine is placed underneath the floor, with the cab moved forward to the extreme front end of the truck. It is claimed that with this arrangement perfect weight distribution is achieved. Gain Power With Less Displacement For the first time since Chevrolet added the Standard six in 1933, a four-door five- passenger sedan is now included in its lower priced line. Chevrolet declares it to be the lowest priced four-door sedan in the field of sixes and eights. Its list price is $540. The major new feature in styling is the treatment of the rear end, where the body panels extend low in an unbroken contour to cover the back of the chassis. This con- struction does away with the rear cross-mem- ber cover, and provides a sweeping effect. In line with the trend toward lighter cars, Chevrolet has made a valuable contribution. This company has developed an engine that gives 54 per cent more horsepower with 22 per cent less displacement. Radial Engine Offers Air Cooling The recent order placed by the government for a large number of Continental Aircraft engines for installation in war tanks has stim- ulated interest in the radial engine for motor cars. This type of engine is advocated as a logical power plant for rear mounting. L. B. Kalb, of Continental, pointed out that the greatest advantage of the radial engine lies in its compactness, structural arrange- ment and low weight, which adapt it particu- larly well to installation in direct connec- tion with the rear axle. Manufacturers reserve their traditional right to disagree with competitors. While one school insists that the rear engine is right around the corner and is shaping cars to receive it, another argues against shifting the power plant. No less an engineer than Carl Breer, of the Chrysler Corporation, points out hazards in the mounting of the power plant over the rear axle such as in- creased danger of injury to occupants in the case of a crack-up. Chrysler engineers declare that the forward shifting of the en- gine over the front axle is the logical solution to the problem of correct weight distribution. There may be more logic in this than appears on the surface, for the general trend in 1935 models is to push the engine about eight inches forward. For 1935, Chrysler announces the new automatic overdrive as standard on all DeSoto and Chrysler models. Thank You for Mentioning Modern Mechanix and I nventions for January When Writing to Advertisers

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Win Cash Prizes for Furniture Ideas (Continued from page 45) the back and bottom as illustrated, if the chair is both spring-back and spring-seat. Each strip must be drawn as tautly as possi- ble to have lasting results. The best way to do this is to use an eight-inch board, padded at one end to avoid scratching the finish, and with three or four nails protruding: at the other end to clinch the webbing. File the heads of the nails off to form points. Make each end fast, weave the strip and use the board as a lever to pull it tight. All ends of the webbing should be turned back before tacking to prevent unravelling. Space the springs as you found them in the old upholstery. Stitch the base of the - springs to the webbing securely with No. 252 upholstering twine. Then tie the tops of the springs in a network with heavy cord so that pressure exerted on.a few springs will be shared by the others: The ends of the cord should be nailed to the frame. Cover Springs With Burlap Cover the springs with burlap, stitching it to the spring-tops and tacking down the edges. Now the first horse-hair covering goes on in the form of a mattress, which should have overhanging sides to be tacked to the frame. Tack the sides, and sew the mattress to the springs with an upholstering needle. Now another layer.of horse-hair, salvaged from the old padding, is put on top of the mattress to smooth the ridges of the mattress. This layer is covered with canvas, which should be tacked down and sewed to hold the previous paddings in place and maintain the shape you have already effected by draw- ing the canvas firmly. Without fastenings, a layer of cotton batting is laid over the canvas to pad the horse-hair. The cotton will pre- vent wiry strands of horse-hair from work- ing through. At this point it is well to make sure there are no hollow spots and that all corners are well filled out. Fill in by stuffing with horsehair or cotton. Upholstering Chair. Arms The fabric you have chosen as the cover- ing material should be cut so that the figure or weave of the cloth will run across both the back and seat in the same direction. This will match the pattern. The final covering is stretched smoothly over the cotton. All box-like corners should be folded uni- formly into the same shape. Tack the edges to the frame after the tapestry has been trimmed to an exact fit. A gimp, or strip of fabric, to match is tacked along the edges. For this small, round button-head tacks are the best. Whether the chair-arms should be tackled first or last is a matter of preference. They should be built-up with the foregoing proces- ses beginning with the horse-hair mattress which must be secured rigidly to the arm with nails. The inside frame of the arm, of course, receives the heaviest padding. The outside is merely covered with tapestry. SEE FEBRUARY MODERN MECHANIX. AND INVENTIONS FOR NEXT CONTEST! Thank You for Mentioning Modern Mechanix and Inventions for January When Writing to Advertisers WE pa T teach you MOUNT BIRDS Send Coupon for Free Book Tells all about Taxidermy, and how you 1 home tomount! ife-likeBirds, Animale Cama hoa Fish. Save your valuable trophies. corate den. arn genuine Chrome Tanning for Four home and leather, buckskin and fine furs, Mount Common specimens sguirrela, rabbits, owls, even frogs, into, marvelous craft-work 5 umorous.. Wild-gami sary, Z marvelous hobby, great fun Do fascination. "°* necessary. BIG PROFITS T700 spire tipe to cash. Havo game trophies for sportsmen; sell antes Bar one} and Make Money with expert tanning. "Learn tut ail from old F u: Gentlemen:— Please send froe 48 Pd page booklet explaining Taxidermy. As |GO TO HIGH SCHOOL AT HOME Mar up the educetion you missed. Study at home in spare time. Your choice of sub- jects, Expert: instruction. Personal service, You make quick progress because you are ip a class by yourself. Diploma. Mail coupon today for interesting FREH BOOKLET. INTERNATIONAL CORRESPONDENCE ‘SCHOOLS “Tho Universal University’? Box 2325, Scranton, Pa. Without cost or obligation, please send me full particulars about the course I have checked—= O English o "a School Course Bookkeeping [O Civil Service Salesmanship Name... O Accounting O Advertising 129

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High School Course in 2 Years Youcancomplete your High Schooledu- cation at home—in 2 years or less. Course meets all requirements for entrance to college and leading professions. Standard textssupplled. Diplo- mB awarded, Full credit for H S. subjecta already complete B us i ness & Over 200 noted Educators, Enelnects, and Business Men helped prepare our Engineering: special instruction mate- al which assures you ma =college-grade training at home for the ea best positionsin Businessand Industry. Ea, The School was chartered i in 1897 as an educa- ‘xempt from Federal in- . uction material used by, resident schools and colleges, U, avy, and Dominion of Canada, ; Home Study Prepares You for the Better ‘Job No matter what yourinclinationsmay be, you can’thope to succeed without proper training. Check kind of work preferred and let us send you full details. No obligation. American School Dept. H-128, Drexel Ave, at 58th St., Chicago ‘z.Air Conditioning --Drafting & Design --Architecture & Building -.Electrical Engineering --Automotive Engineering ..Electric Refrigeration --Business Management --HigherAccoun’g (C.P.A.) .-Civil Engineering --High School Course --Complete Law «-Highway Engineering .-Diesel Engineering --Mechanical Engineering broadeasting, aviation and EN G l N EER l N G, police radio, servicing, marine radio telegraphy and telephony, Morse telegraphy and rail- way accounting taught thoroughly. Engineering course of nine months’ duration equivalent to three years of college radio work. School est. 1874, All expenses low. Catalog free. DODGE’S INSTITUTE Fern St. Valparaiso, Indiana Also earn G Nothing else “Win Sueceas in Adverteine and Mako money in” advertising. Prepare quickly daring para dime hile fer Bond at No experienes necessary, ike at ae one for, ,free booklet — age-Davis School of Advertising 3601 Michigan Avenue, Dept.2051, Chicago, Illinois, U. S. A. HOW TO BUILD BOATS, AUTO RACERS, RADIOS, MODELS 1934 How-to-Build-It —- Send 50c to Modern Mechanix Publishing Co. 529 S. Seventh St., Minneapolis, Minn. Help Kidneys Don’t Take Drastic Drugs You have nine million tiny tubes or filters in your Kidneys which may be endangered by using drastic, irritat- ing drugs. Be careful. If poorly functioning Kidneys or Bladder make you suffer from Getting Up Nights, Leg Pains, Nervousness, Stiffness, Burning, Smarting, Acidity, Neuralgia or Rheumatic Pains, Lumbago or Loss of Vitali- ty, don’t waste a minute. Try the Doctor’s prescription called Cystex (pronounced Siss-tex). Formula in every package. Starts work in 15 minutes. Soothes and tones raw, irritated tissues. It is helping millions of sufferers and is guaranteed to fix you up to your satisfaction or money back on return of empty package. Cystex is only 5c at all druggists. 130 For Thrilling Sport Start Skeet Club (Continued from page 81) driven in midway between AC. Using B as your center, measure a cord 20 yards long and describe a semi-circle shown on: dia- gram as AEC. Drive stake E an equal distance from stakes AC. Then divide AE and EB each into three equal parts. These six parts should measure approximately 31 feet. You have now located the eight stations where the shooting will be done. Permanent posts should be erected at each station with a small box nailed on top to hold shell boxes. Skeet requires the services of two traps located in small houses at stations 1 and 7, each house to face one another. These houses are identical in construction with one exception—the opening from which the target is thrown. In the No. 1 trap, the trap door is higher. The bottom ofthe opening must be at least 10 feet fromthe ground while the No. 7 trap opening should be less than 3 feet. The No. 1 trap can*be elevated on legs to accomplish this i The Skeet Program `t The modern skeet layout utilizes an elec- tric trap-pulling device, located behind sta- tion four, which regulates the’ timing of the targets. A regulation target is one Which Passes over the middle station (No. 8)-at a height of fifteen feet. The correct speed will throw them 15 to 20 feet past the opposite trap house. When passing over station 8, a regu- lation target will be traveling approximately 50 miles an hour. Each skeet event consists of 25 targets. Two single shots, one from each trap, are taken from each of the 8 stations. Next come 4 sets of doubles, the targets being released at the same time, one from each trap. These 8 shots are taken from stations 1, 2, 6 and 7. You have now accounted for 24 shots, leav- ing one extra. To finish a box of shells, the last shot (known as the optional) may be fired from any station the shooter so desires. 12 Gauge Good All-Around Gun Many types and makes of guns are used in skeet shooting including the over-and-under, pump, automatic and double. In the main, it’s not the gun but the man who handles it. But one important point to remember, the gun has to fit you. The standard shot loads of ‘the different gauges are: twelve-gauge, 14% ounces of shot; sixteen-gauge, ounce; twenty-gauge, % ounce; twenty-eight-gauge, % ounce; four- ten-gauge, 3% ounce. Using the same size shot, if these loads were spread out in pat- terns of equal density, their values are repre- sented in an accompanying drawing. These figures show the relative values of the gauges with the advantage lying with the “twelve” on down to the “four-ten.” How- ever, the larger the gun, the heavier and harder to handle it becomes. There is hardly a doubt, however, that a twelve-gauge gun is the gun for a man who can afford to purchase but one gun. It is the Thank You for Mentioning Modern Mechanix and Inventions for January When Writing to Advertisers

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For Thrilling Sport Start Skeet Club best all-around gauge for hunting, skeet and trapshooting. Always endeavor to break your targets over station 8 where you have the full advantage of your pattern. If you shoot at a target too close, your pattern hasn’t the spread; while shooting too late allows the pattern to spread too much. Hitting Skeet Targets The oultgoer from station 1—This target comes from above the shooter’s head from the high trap house, therefore must be shot un- der. The most common fault here is shoot- ing at the target—not under it, because it is dropping by the time the shot-load reaches it. The incomers from stations 1 and 7—These are the easiest shots on the skeet program— remeniber to cover the birds fully. The oufgoers from stations 2 and 6—Keep well-ahead and under. - The incomers from stations 2 and 6—The lead:should*be’a-combination of lateral and upward. «Don’t-follow too long. Shots from stations 3 and 4—These call for increased lateral and decreased downward and-upward‘leads. _; Stations 5, 6 and 7—-These targets vary but little ftom the corresponding stations on the other half of the semi-circle. They rise a little faster because of the low trap. Outgoer from station 7—-This is the only position that calls for a shot af the target. Shoot directly at the bird. Station 8—A snap shot. The gun muzzle should just cover the mark and the trigger pulled on the instant. Generally considered the most difficult birds for beginners in skeet shooting. Tips for Beginners Don’t venture into skeet without some pre- vious instructions in gun handling. Start shooting under the supervision of someone experienced. : Keep uppermost in your mind that all skeet targets traveling in a lateral direction must be led. Try and keep both eyes open. Wear glasses as an aid to vision whether you need them or not. Be sure and keep your head on the gun stock. Shoot from a position that feels most natural to you, but stand with shoulders lean- ing forward, and head as nearly in vertical position as possible. In other words, don’t lean over on your stock. On all cross shots, swing ahead and keep swinging. Don’t shoot too much. Here is a fault com- mon with many beginners. On their first trial they become so enthusiastic over the sport they shoot more than they can afford. Limit your practice shooting to fifty shells. This is particularly sound advice to novices with shotguns, for their muscles will not with- stand the recoil and bruised shoulders will result. ATLAS 9” Metal-Working Lathe Accurate to 0.001” . . $79. A complete unit, with belts and pulleys self-contained You buy a complete unit, ready to run, with self-con- tained countershaft and all belts. Standard equipment in- cludes automatic reversible feed; hollow headstock spin- dle; complete set of gears to cut from 4 to 72 threads per inch; thread cutting dial; compound rest graduated to 180°; six speeds with pat- ented compound device, doing away with complicated back gears; Vee- belt drive—more pulling power. Forty-five parts of Zamak Metal which has twice the strength of east iron but is much lighter, thus doing away with useless weight. Lathe bed of heavily ribbed cast iron accurately machined and | ground on very latest type of ma- chine shop precision equipment— tested before shipment to .001” accuracy—9’’ swing—18’’ to 36” between centers. Immediate ship- ment. 10 days’ trial with money back guarantee. Full line of tools and at- tachments at lowest prices. Send for free illustrated catalog. Be sure you know about the Atlas Fully Equipped Lathe before you order. Renl metal working Lathes as low as $40. Write for information. ‘ATLAS PRESS COMPANY 1852 N. Pitcher St. Kalamazoo, Mich., U. S. A. NEW ATLAS DRILL PRESSES Built in four Sizes, for all classes of work. Bench and Floor Models. More and bigger bear- ings. Special Atlas construc- tion prevents side play in quill. Speeds up to 5200 R.P.M. Precision tools — Priced from $13.95 to $33.45. Are you adult, alert, ambitious, willing to study? Investigate LAW! We guide you step by step— furnish all texts, including 14-volume Law Libra- ry. Training prepared by leading law professors and given by members of bar. Degree of LL. B. conferred. Low cost, easy terms. Send NOW for Free ,64-page“Law Training for Leadership.” LaSalle Extension University, Dept. 1493-L, Chicago Thank You for Mentioning Modern Mechanix and Inventions for January When Writing to Advertisers 131

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A. C. GENERATOR TEN Practical and inexpensive changes converting Dodge 12-V, Ford T, A, Chevrolet Delco 6-V generators into 100-500 watt capacity A.C. generators, or into 32-110-V. D.C. motor or genera- tor. Dodge is 500-W self-excited. All in one book illustrated with complete simplified instructions and drawings for only $1. Autopower, 412 S. Hoyne Ave., Chicago. ADVERTISING AGENCIES ADVERTISE: $15 reaches 6,000,000 readers with 24 word ad.. Newspaper and mail-order magazine Rate-Guide, free. Chicago Advertising Agency, 22 West Jackson, Chicago. ADVERTISE—24 words in 250 news- papers $10. Lists Free. Advertising Service Bureau, 4650 Drexel, Chicago. FREE NEW advertisers rate guide. Brown Advertising Agency, 140 South Dearborn, Chicago. ADVERTISE, 24 words $2.40. Mail order circulation 100,000 guaranteed. Goodall Adv. Co., Box 1592-P, San Francisco. INCH Display Advertisement 50 maga- zines year $24. Wood’s Popular Ser- vices, Atlantic City. AGENTS WANTED CASH Income Daily Resilvering Mir- rors at home. Replating autoparts, tableware, ete. Portable outfit, Write Sprinkle, Plater, 850, Marion, Indiana. AGENTS’ Gold Sign Letters for store windows. 500% profit. Free sample. Metallic Letter Co, 426 N. Clark, Chicaga BIC MONEY applying gold initials on automobiles. Easiest thing today. No ex- perience needed. Free samples. ‘“Ralco,” 1984 Washington. Boston. Mass. MEN—WOMEN, Make $5 profit each easy $6 sale. Exnerience unnecessary. Almost every family a prospect. Sales kit sent Free. Write Capital Assn., Dent. 616, Denver. Colorado. AGENTS: Smash go prices. Santos Coffee 12c Ib. 4-0z, Vanilla 8%c. $1.00 size Tonic 14c. Razor Blades 10 for 84c. 100 sticks Chewing Gum 12c. 150 other bargains. Exnerience unnecessary. Write Carnation Co., MN, St. Louis, Missouri. MAKE Money. Collect $5, keep $4. Two quick selling dollar per month “hard times” life. policies. Great North- ern Estate Corporation, Department C, Rockford, Illinois. GOOD Income Plating Auto Parts, re- flectors, mirrers, hy new method. Out- fits furnished; free particulars. Gun- metal Co., Ave. A. Decatur, TIl. GO INTO Business—Sell new and used elething. 100% -300% profit. Satisfaction guaranteed. We start you. Ideal Rum- mage- Sale Co., AK-3206 So. State, Chicago. SELI new accessory to garagemen, me- chanics. Make $5.00 un daily. Big profit, low price, fast seller, No invest- ment. We fill your orders direct or you deliver. Sample 75 cents Postpaid. Details free. Clymer, Dent. MM, 434 West Pico, Los Angeles. Calif. SELL Colored Folks: Hair straight- ener, Bleach Cream, Perfumes, Incense, 300 products. Write for Free samples. Bie money making offer. Valmor, 5249-SM Cottage Grove, Chicago. 132 Classified Advertisements accompany order and be recelved in this office December 3 for tho February issue (on sale Dee. 31). Address Classified Mgr., Modern Mechanix and Inventions, 52 Vanderbilt Avenue, New York Clty. FREE literature describing many mon- ey-making plans, D-Belfort, 4042 N. Keeler, Chicago. ` SELL Products under your own label. Big line. Low prices. Edward-Walfred, 5007-K Irving Park, Chicago. LOCAL Agents wanted to wear and demonstrate Free Suits to friends, No canvassing. Up to $12 in a day easy. Experience unnecessary. Valuable dem- onstrating equipment, actual samples Free. Progress Tailoring, Dept. N-219, 500 Throop, Chicago. PENNY Each. Popular Sizes, Guaran- teed Window Sign Letters. Enormous Profits. Easily Applied. Free Samples. Atlas Sign Works, 7941-G, Halsted, Chicago. AGENTS Wanted everywhere to call on Hardware and Electric Stores. State ex- perience and what city or state you ex- pect to handle. Schultz Electric Co., Oregon City, Ore. BIG MONEY and Fast Sales. Every owner buys Gold Initials for his auto. You charge $1.50; make $1.45. Ten orders daily easy. Write for particu- lars and free sample. American Mono- gram Company, Dept. 11, East Orange, New Jersey. REGULAR income; home, office. No canvassing. McArthur Co., Desk 19, Butte, Montana. BRAND New Invention.. Auto Brush. Attaches to garden hose. Washes entire car, spokes and all. 100% profit. Exclu- sive territory to distributors. Sample $1.50. Circular free. Beisser Auto Brush Co., 419 E. Fort, Detroit, Mich. FREE booklet outlines 14 legitimate methods establish your own business; $25-$125 weekly; spare, full time; oper- ate from home or office. Charltog, Box 6310, West Market St., Philadelphia, Pa. AIRPLANES HUNDREDS of Airplanes. Crackups $30 up. Send 20c for Directory. Used Aircraft Directory, Athens, Ohio. $= AUTOMOBILE SERVICE EQUIPMENT MICROMETER: Measures outside evéry thousandth between 2 and 5 inches. Permanent accuracy guaranteed. $1.00. Agents! Schaap, Laurelton, L. I. AUTO SUPPLIES AUTOMOBILE Supplies! Radios! Bankrupt Stocks! World’s Lowest Prices! Reconditioned AC Spark Plugs 29c! Hot Water Auto Heaters $3.98! House Radios $12.85! Paint 95c gallon! Seat Covers 98c! 1000 Bargains! Free Bulletin! Standard Liquidators, 1363- BB Gratiot, Detroit. AUTO owners—save 50-100%—why pay. high retail prices for auto supplies. Buy. wholesale, guaranteed products, Inquire. N. D. Products Co., Vander- bilt, Pa. SPEED Parts for Fords. Overhead valves, special manifolds, carburetors, wheels. Speed books. Low priced acces- sories for Ford, Chevrolet, Plymouth. Special price two only Harry Miller new overhead camshaft heads Model A Fords. Very fast, few ever built cost $350. Sacrifice $125 each complete ready to install. Send dime for catalog and sample copy Speedway Racing Magazine with large car, midget and motorcycle racing news. Clymer Speed House, 434 West Pico Street, Los An- geles, California. AVIATION ARMY Air Corps gives free flying training, salary, expenses paid. Infor- mation booklet, how to qualify, apply, 20c. Same information on Navy Avia- tion, 20c. Continental, Box 344A, In- dianapolis, Ind. UNTIPPED Propellers; 4, %4, % h.p. motors $1.75; 40’, $4.00; 48”, $4.25 51’, $4.50; 54’, $5.75; 64”, $7.5 Harley air drive prints. The J. B Propeller, Lititz, Pa. SELLING Out! The original Aircraft Directory. Has saved thousands of buy- ers thousands of dollars. Lists huge stocks used, surplus Ships, Engines, Wheels, Parts, etc., over entire United States. Last chance! 1934 Supplement 25c postpaid. Aerobuilders Service, 2544 LaFayette, Lincoln, Nebr. : MODEL Airplane Plans. Free particu- lars. Midget Airplanes, 1803 Liliha St., Honolulu. USED Airplanes $30.00 and up. Liter: ature 10c. Continental, Box 344A, In- dianapolis, Ind. $ “AERODRIVE” (85 MPH) Sled, De- tailed constructional blueprint 25c (coin). 3 other types sled prints, 25ċ each. Propellers. Ostergaard Aircraft, Parr, Indiana. : nes AIRMINDED Young men interested in entering the field of Aviation as Ap- -prentices. Write, enclosing stamp—Me- chanix Universal Aviation Service, A- 13291 Ardmore, Detroit, Mich. LORENZEN Propellers for Airplanes, Ice and Snowsleds, also wind driven generators. Large illustrated catalog, dime. Complete Blueprints for Easy Built, two place, Airplane Typed Ice- sled Ground Trainer, $2.00. Lorenzen Propeller Company, Niles, Michigan. METAL tipped propellers; Fords, $9.98; Henderson, $8.50; Harley, untipped, $3.50; New production ships, $98.00; LeRhone 40 HP. motors, $98.00; in- cluding propeller. Photos, information, and leather bound flying manual, 25c. Hibbs, Fort Worth, Texas. BICYCLES BICYCLE Repair Book—Tells Every- thing—Send 25c—Parts Catalog Free. A. H. Harwell Cycle Works, Dept. 102-A, 6267 Gravois, St. Louis, Mo... BIG MAILS BUSHELS of letters bringing money- making opportunities, 25c. Mailmarts, Cincinnati, Ohio. BLUEPRINTS MAKE Practical Useful Saleable Items at home from Detailed Blue Prints. Free List. Ketko Designing Engineers, Win- ton Place C, Cincinnati, Ohio. GUARANTEED Instructions for mak- ing blueprints, blueprint paper and print- ing frame $1. Lewaco, Box 126, St. Cloud, Minn. LOW-wing Sailplane Blueprints, $4. Information, dime. Reber, Old Glory, Texas. BOATS FAST moving Steam Racing Boats. Guaranteed to run by steam. Free Fuel. 25e Postpaid. Parco, Box 306, Galves- ton, Texas. Thank You jor Mentioning Modern Mechanix and Inventions for January When Writing to Advertisers

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BOOKS FOR SALE BUSINESS OPPORTUNITIES SEND stamped; addressed envelope for free copy ot big M-M Blueprint book, listing many workshop books and blue- print plans. Modern Mechanix Publ. Co., 529 So. 7th St., Minneapolis, Minn. BURIED TREASURE TREASURE Seekers—Learn scientific methods. Frank Wyss, 10414 Frances, St. Joseph, Mo. BUSINESS OPPORTUNITIES WISE Men Get Money Easy! 10c. “‘Mooremade,” Lapeer, Mich. CASH Income Daily Resilvering Mir- rors at home. _ Replating autoparts, tableware, etc. Portable outfit. Write Sprinkle, Plater, 845, Marion, Indiana. WHOLESALE Supply Sources, half million items, 10c International Agency, Cincinnati, Plan Income from drained auto Instructions, 25e. International Agency, Cincinnati, Ohio. MAKE mirrors from old window glass. Complete instructions, 25c. Westcott, Clyde, N. Y. OPERATE Well Paying Home, Mail- order. Business. Details. Duffy-Co., Covington, Ky. TATTOOING Outfits, Supplies—Cata- logue. Guaranteed Remover. “Waters,” M-965 Putnam, Detroit. CASH earnings positively guaranteed! No canvassing. Rush dime. Mailmarts, Cincinnati, O. DOLLARS Daily! other offers, 10c. Cincinnati. HOW to obtain a business education in your home. Successful brains the guide to a full pocketbook. New ideas, original business plans, money making secrets and much valuable information. Write, Midwest Sales Co., 824 W. 3 Street, Cedar Falls, Iowa. SIGNS and_Showcards easily painted with Letter Patterns, Large variety of styles and sizes. Write for free samples. John Rahn, B-2120 Neva, Chicago. RECEIVE 100 letters and dimes daily —instructions 10c. Steve Tomin, Box 29, Wyandotte, Mich. SUCCEED With Your Products. —Sell them. Formulas, Processes, Ana- lytical Service. Catalog free. A. Thaxly Co., Washington, D. OPPORTUNITY to make money; book eontaining 87 successful business plans; home or office; send for free introduc- tory booklet. Brody, 7 Trumbull St., Worcester, Mass, LEARN all about casting marble novel- ties in rubber moulds. Cement secrets. Illustrated catalog and beautiful sam- ples 3c. (So. Calif. business reserved.) John H. Payn, 945 Grande Vista Ave., Los Angeles, Calif. COLLECT old spark plugs. Worth 4c. Details 10c. Goldenrule, 2018 March, Kalamazoo, Michigan. HOMEW ORKERS—$25.00 weekly for eight hours’ work addressing envelopes. Everything furnished. Capital or ex- perience unnecessary. Complete instruc- tions 25c. Business Builders, James- burg, N. EXTRA Money, also 100 letters daily, each containing dime. Send 10c for in- structions and formulas, Williams Sales Service, 613 Copeland Ave., LaCrosse, Wisconsin, AMATEUR cartoonists, earn $25.00 week, spare time, copying cartoons for advertisers, Three-M Syndicate, Argyle, is. EARN $10 Daily. Complete instructions 25e. Home Business, 1803 Liliba Street, Honolulu, Hawaii. No selling. Facts, Int’nat’l Agency, Thank You for Mentioning Modern Mechanix and Inventions for January When Writing to Advertisers THE PLASTEX Industry needs manu- facturers on small scale and for big pro- duction of Art Goods, Novelties, Souve- nirs, etc, in Plastex ‘and Marble imita- tion. [Experience unnecessary. 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. MEN-WOMEN interested earn money home, write Eller, F-277 Broadway, New York. MAKE $21 per 100 Stamping Names on Keychecks. Samples and Instructions, 25c. Supplies Furnished. Ketagsm, Cohoes, N. Y. “KEY to Business Opportunities” free. Goodall, Box 1592-P, San Francisco. SELL by Mail! Books, Novelties! Bar- gains! Big profits! Particulars Free! H. Elfco, 525 South Dearborn, Chicago. COMPLETE Chemical perce: Analy- sis, Formulas, Consultations. State Licensed Chemist. Twenty-five years’ experience. Write for literature, A Cummings, Ph.D., 428 Gordon Avenue, Syracuse, N. `Y START Now! A profitable spare time, home mail business. Complete instruc- tions 25¢ coin. Bucher, 4631 Perrys- ville Rd., Bellevue, Pittsburgh, Pa. SELLING Formulas profitably: Com- plete Mailorder Plan, 25c. Duffy-Co., Covington, Ky. A PROFITABLE business of your own. Easy, proven plan, details, 20c. Box 10, Norwood, Ohio. 10,000% PROFIT Guaranteed under a forfeit of $100. Stamp for particulars. Ideal Products, Box 55, Kirkland Lake, Ontario. A FORTUNE in This Idea! Make and sell easily, No-Frost Solution for dis- play windows, windshields, ete. Send 25c (coin) for formula and plan. Cir- cular of many other valuable formulas for stamp. Nelson, Box 5744-HC, Cleve- land, Ohio. YOU can’t lose. Guaranteed money- maker. Plan Ten Cent coin. Ock, 5728 13th Court, Kenosha, Wis. $$$$ $40.000—I made it. “MooreMade,” Lapeer, Mich. SUCCEED! You Can! Any business. Millions spent yearly for Success Ideas. Grasp today’s Special Offer! Don’t wait! Make your dreams come true Now! For particulars write L. IL. Rep. Box 7, Hopkinsville, Ky. Inclose fifty cents, cash, check. or money order. GET Barrels of Mail. Your name in 10,000 Opportunity Directories. 25c. Roservice, 4627 Glenshade, Cincinnati. SELL common salt for $1.60 Ib. Com- plete instructions, 25c (coin). Westcott, Clyde. N. GO INTO mail business. Leader three- way plan—wholesale, retail and service. Big money in each line. Free Circular. Swanton, DeLand, Florida. HOW would you like to receive 100 letters a day, each containing a dime? Will send plan for 10c. Carl Greiner, 5112 N. Oakley Ave.. Chicago, TII. WE MAKE Synthetic Rubber Molds. Send model for estimate. Prices ex- tremely low. We teach Marbleizing and Mold Making in all branches. Get this valuable information. Send dime for sample mold, cast and assorted samnles. Literature. Cowell Institute, Grayling, Michigan. INCOME Daiy—Home mail business. Plan, ten formulas, two dimes, M-B Service, 1060 Alter, Detroit, Mich. Plan 10c. BUSINESS OPPORTUNITIES BIG money manufacturing foods and selling in own establishment. Not res- taurant or grocery store proposition. Full instructions $1, circular free. Asso- ciates, Box 852, Syracuse, N. Y 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. EVERY man dreams of having a com- fortable income. Why be content with a bare living when it is so easy to be independent ? My valuable booklet “Op- portunities” describes many, moneymak- ers, and can be had for only 25c. Don't delay. Mr. Edward A. Bauer, 4837 N. Albany, Chicago. MAIL Order business is your oppor- tunity. Many began small, now earn thousands yearly. No personal contact. Have had over 30 years’ experience; will help you succeed. Send 25c for batch valuable information. None free. E Breniser, 257 S. 21st, Philadelphia. MONSTER Mails. Money making, plans, formula offers, 10c. Duffy-Co., Covington, Ky. CASH: Listing local names. Interest- ing spare time home occupation. Com- plete working plans 25c postpaid. Pub- lishers Bureau, 850 East 47th, Chicago. MEN to distribute Advertising Coupons. Dime brings samples, full details. No selling. Midwest, Box 161-M, Spring- field, Illinois. CONQUER the Depression. 250 Guar- Ideas. Two dimes. Enterprise Bureau, Tower M-D, CAMERAS AND PHOTO SUPPLIES MAKE Money in Photography. Learn quickly at home. Spare or full time. New plan. Nothing like it. Experience unnecessary. American School of Pho- tography, Dept. 2046, 3601 Michigan Avenue, Chicago. you to make photographs for magazines, newspapers, advertisers. Tremendous demand. Earn good money wherever you live. Free book. Universal Photo- graphers, Dept. A, 10 West 33rd St., New York. CARNIVAL GAMES MAKE you money—Outfits supplied, catalog 10c. ‘‘Mooremade”, LaPeer, Michigan. CARTOONING LEARN Cartooning—30 lessons, illustrations, with drawin pencils. Postpaid complete, Scovell Studios, Box 610-A, Hollywood Calif. CHALK TALKS LAUGH Producing Program, $1.00. Catalog free. Balda Art Service, Dept. 65, Oshkosh, Wis. "CHARTERS DELAWARE Charters; fees small; free forms. C. Grant Guyer, 901 Market St., Wilmington, Del. CHEMISTRY Sciencecraft Magazine! stamp for copy and other valuable litera- ture. Sciencecraft, M-5049 Bernard, Chicago. SEND 10c for new catalog listing chem- ical, pany, Dept. 99, 124 West 23 St., New York. DESIGNS FOR FRETWORK FRETWORK Designs — Set Beautiful Samples 20c. James Field, Colorado Springs, Colorado. 13 Oo

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DETECTIVES BE. A. Detective. Make secret investi- gations. Experience unnecessary. Write United Detective System, 1623 W. Grand, Chicago. BECOME a successful detective. Par- ticulars and Detective Paper Free. National System, 340-D Electric Bldg., Omaha, Nebraska. DETECTIVES. Make Secret Inves- tigations. Experience unnecessary. De- tective Particulars free. Write, George Wagner, 2640-V Broadway, N. Y. DISTRIBUTORS DISTRIBUTORS: Represent manu- facturer. Sell Latex—self sealing band- age that breathes. Great demonstrator. Lowest prices. 400% profit. Good re- peater. Exclusive territory. Neway, 24-G South Clinton, Chicago. 2 DOG TRAINING TRAIN Your Dog — 25 interesting tricks, 25c. Hollywood Specialties, Box 572, Hollywood, Calif. DUPLICATORS INCREASE Business. “Excellograph” Rotary Stencil, Clay, and Film Duplica- tors $3.85 to $37.50. Prints anything typewritten, penned, drawn, traced. Colors. Folder Free. Pittsburgh Type- writer Supply, Suite 519, Pittsburgh, Pa. EDUCATIONAL EDUCATIONAL Books, Correspond- ence Courses sold, bought, exchanged. 10,000 bargains, catalogue, 6c. Educa- tional Exchange, 7315 Middlepointe, Dearborn, Michigan. USED. Correspondence Courses and Educational Books sold or rented. In- expensive. Money-back guarantee. Write for Free Catalog Listing 4000 bargains. (Courses Bought). Lee Mountain, Pis- gah, Alabama. ELECTRICAL EXPERIMENTS BANKRUPT Stock—Electrical Experi- mental kits—Kit makes motors, detec- tophones, arc furnace, telephones, etc. Salvage price $1.99. Other outstanding ELECTRICAL SUPPLIES INSULATION, wire, varnishes, sup- plies, etc. Send 3c stamp for bulletin. Autopower, 412 S. Hoyne Ave., Chicago. DIRECT Drive Propellers for 6-volt generators, $3.00. Postpaid. M. E. Larson, Rt. 5, Minot, No. Dak. FARM LANDS FREE Homesteads— Some improved, forfeited; 18 states. Maps, “700 Facts,” 40c. MY-33, Modern Mechanix and Inventions, Minneapolis, Minn. FEMALE HELP TYPISTS—Make extra money spare time copying radio scripts, ete. Expe- rience unnecessary. Ño canvassing. Write, enclosing stamp. Typists’ Asso- ciation, 1763 Hunter Bldg., Chicago. FIELD GLASSES—BINOCULARS Military shoulder strap. Ideal for Sporting events, na- ture study, Xmas gifts. Limited num- ber $1.50 C.O.D. C. Zeissler Binocular Co., 5435 Cornell Ave., Chicago. FIRE ALARMS ELECTRIC Fire Alarm rings doorbell. Transforming ordinary electric doorbell into reliable Fire Alarm is made possi- ble by easily installed fuse controlled Herr Fire Alarms. They protect you safely from severe Fire losses. Exclu- sive Territory available. Herr Auto- matic Fire Alarms, Mfrs., Collinsville, Illinois. 134 FIRE ARMS GUNSMITH’S Sécrets—Bluing, check- ering, engraving, etc., 25c. Internation- al Agency, Cincinnati. FOR EXPERIMENTERS FREE! Sciencecraft Magazine! Send stamp for copy and other valuable litera- ture. Sciencecraft, M-5049 Bernard, Chicago. FOR INVENTORS INVENTORS: Send immediately for your copy of our big, new Free book, “Patent Protection.” Forty-eight pages of interesting facts. Tells how. Patent Laws protect you; kind of sketch or model needed; simple steps to take with- out cost; how successful inventors have secured financial assistance; shows in- teresting inventions; illustrates impor- tant mechanical movements. Other men have read and profited by this book. With book we also send Free Evidence of Invention form, that you can use to establish date of disclosure. Prompt ser- vice, reasonable fees, special deferred payment plan. Strictest secrecy. Thirty- six years’ experience. Highest refer- ences. Write us today. The facts in our book are worth money to the man with a good invention. Address: Victor J. Evans & Co., Registered Patent Attor- neys, 421-A, .Victor Building, Wash- ington, D., C. ATTENTION Inventors. Unpatented inventions marketable. Real advice and rotection. Write H. Benjamin Royer, elaware, Ohio. SELL before patenting. Now safe, prac- tical. Saves time, expense. Write Char- tered Institute of American Inventors, Doe Barrister Building, Washington, INVENTORS—Sell before patenting. Free particulars. Write W. T. Greene, 942 Barrister Building, Washington, D. C A PATENT is a Deed to intellectual property. Property has a value. To obtain patents, trade marks, write to Associated Service, 18 East 41st St., New York City. Our 50 years practice is your guarantee, We perform—others your inventions FREE—Formula Literature, Manufac- ture products yourself. Thomson, 7309 Pingree, Chicago. 3,000 FORMULAS, Facts, processes, trade secrets in Dr. Brown’s Book of Formulas—380 pages. Price, postpaid eee Ogilvie Publishing Co., 57 Rose treet, Dept. 4, New York. FORMULAS — Interesting Literature Free. D-Belfort, 4042 N. Keeler, Chicago. THREE Tested Formulas 25c. L. Cable, 2432 Glen, Altadena, Calif. 500 FORMULAS, trade secrets, 25c. Literature Free. Pelishek’s, Adell, Wis- consin. : !!!LIQUID Solder, Waterless Hand Soap, & 8 other Formulas 25c! Ten Formulas; Moneymaking Ideas; sent monthly for Year, $1.00. New Gasoline Intensifer; Decarbonizer_ Formula $1.00!!! T-S-G-Co., Box. Ten, Wil- kinsburg, Pa. GAMES KIPPY—Home Golf Course, Ideal Christmas Gift for young or old. $1.95 postpaid. S. & B. Sales Co., Newton, Towa. GASOLINE ENGINES ¥% TO 5 horsepower light weight gasd- line engines for operating midget.autos, lighting plants, general purposes. Send dime for bargain list. Columbia, 4020 Lake Street, Chicago. GOLD PROSPECTING BUILD your own inexpensive devices: radio-active finder; mechanical panner; volume hydraulic washer; portable sluice. Booklet, illustrated instructions $1.00. Outdoorman’s, Coeur d'Alene, Idaho. GUMMED LABELS GUMMED Labels—Printed to order. | 50c thousand up. Manzler Labels, Dork- ing Road, Rochester, N. Y. 1000 PRINTED, size %"x2%", 50c. Marsh, 2055 Westcourt, Ithaca, N. Y. 1,000 PRINTED, name, business, ad- dress, 50c. Tupper, Federal St., No. Wilmington, Mass. HEATING promise, PATENTS—Before too heavy an out- lay of time or money is made on an invention, a search of the Patent Office records should be made to determine as nearly as possible whether or not the same idea has been patented before. The cost of this search is small, while the value of the facts it uncovers is often considerable. We offer inventors and manufacturers a thorough, prompt, con- fidential search service—plus_ experi- enced counsel and assistance in every phase of Patent and Trademark practice. Write for my free book containing valu- able information relating to patent pro- cedure. Clarence A. O’Brien, Regis- tered Patent Attorney, 28-P Adams Building, Washington, D. C. FORMULAS FORMULAS—AIl kinds. Guaranteed. Catalog Free. Kemico, B-16, Parkridge, Illinois. TWENTY leading formulas! brings them all! Cincinnati, O. SUCCEED With Your Products. Make —Sell them. Formulas, Processes, Ana- i Quarter International Agency, lytical Service. Catalog free. A. Thaxly . Co., Washington, D. C. GOOD formulas 25c, three 50c. Silves- ter, Old Bridge, N. J FREE Book! Money Plans—Formulas. Send 9c postage. Tracey Company, Evanston, Illinois. 20 PROFITABLE formulas, 20c. Any single formula, 20c, Westcott, Clyde, New York. CUT fuel bills. Increased heating effi- ciency guaranteed. Particulars, stamped envelope. Fuel-Saver Devices Comnany, 900 Manhattan Ave., Dayton, Ohio. HELP WANTED time copying radio scripts, etc. x rience unnecessary. No canvassing. Write, enclosing stamp. Typists’ Asso- ciation, 1764 Hunter Bldg., Chicago. in United States, America, other countries, write E. Moore, 1834 Hunter Bldg., Chicago. Enclose Stamp. WANT Salaried Position? Wherever you live, securing the right position de- pends on knowing how. Mail 20c for Tobseeker’s Guide. Shows where to look, how to apply, what to say. Employment Counselors, 401-MC Bedford Building, Chicago. We Purchase All Indianhead Pennies. Pricerange 5c - $25.00. Purchasing lists 10c. Photonumismatic, 100 Forsyth, New York. HYPNOTISM HYPNOTIZE instantaneously! New dollar book 25c. Lonk Institute Hypno- tism, D-1313. Palatine, Tllinois. HYPNOTISM learned auickly. Con- densed lessons, $1.00. Shavers School Equinox, 949, Pisgah, Ala. INFORMATION RELIABLE information, source sup- ply, any subject, $1.00 up. National Bureau of Information, Cedar Rapids, Towa. Thank You for Mentioning Modern Mechanix and Inventions for January When Writing to Advertisers

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INSTRUCTION WANTED Inmediately, Men-Women, age 18 to 50, qualify for next eligibility test for steady Government Jobs; com- mence $105-$175 month. Common edu- cation, paid vacations, pension. Valu- able information from our Civil Service Expert mailed Free. Write, Instruction Bureau, 234, St. Louis, Mo., Today. EARN Regular monthly salary as Secret Service and Finger Print Identification Operator ... thrills, fame, travel. Write for details and “Confidential Re- ports Operator 38 Made to His Chief.” All Free. Institute Applied Science, 1920 Sunnyside Avenue, Dept. 235-E, Chicago. INVENTIONS INVENTIONS Commercialized, Pat- ented or unpatented. Write Adam Fisher Company, 582 Enright, St. Louis, Mo. AUTOMOBILE inventions, devices, tools, etc., wanted. Anything that can be sold through garages and automobile parts dealers. Will manufacture or take eutput. Box M35, Modern Mechanix and Inventions, 52 Vanderbilt Ave., New York City. IF you have a sound, practical invention for sale, patented or unpatented, write Chartered Institute of American Inven- tors, 508B Barrister Building, Wash- ington, D. C. SMALL Inventions wanted. A. Hull, 7829 Euclid Avenue, Cleveland, Ohio. yours. $1.00. Money back if not delighted. Roesch & Associates, Inc., 935 University Block, Syracuse, N. Y. INVENTIONS are the source of wealth and independence. What have you? Write National Service Bureau, Dept. H., St. Louis, Mo. INVENTIONS new or old—Market them through National Inventors Con- gress, Oakland, Calif. INVENTIONS Wanted, Patented or- Unpatented, any size, any material, for any purpose. Now is the time to act. Send us your ideas. A square deal as- sured. Bosley Mfg. Co., Torrington, Conn. MACHINERY, TOOLS AND SUPPLIES HARD to Get Supplies; Specialties; Tools; Magnet Wire; Insulation; Metals; Motors; Pumps; Gears. Catalog 10c. Kostka. 2358-L So. Crawford, Chicago. MAGIC TRICKS & NOVELTIES LEARN tricks that made magicians famous. Escape from handcuffs, ropes, trunks, etc. No expensive equipment necessary. Full instructions 50c. Prince, Box 601, Sioux City, Iowa. PORCELAIN Bisc Dog, Ash Tray Ex- tinguisher, 25c postpaid. Albert C. €arncross, 304 Dearborn. Buffalo, N. Y. HOUDINI’S book of magic shows how to mystify your friends. Over 50 tricks, 50c. Hollywood Specialties, Box 572, Hollywood, Calif. A REAL magician’s outfit! An instru- ment to make different animal sounds; Japanese handcuffs; a trick to tell people’s ages, all for 15e. Mystic Wiz Company, 1145 86th Street, Brooklyn. MAILINGS 500 CIRCULARS Mailed $1.00. Try us! National Business Bureau, Box 515, Evanston, Jllinois. MALE HELP WANTED FOREST Jobs easily available, $200 month. Cabin, Hunt, trap, patrol. Get details immediately. Rayson Service, K-32, Denver, Colorado. Thank You for Mentioning Modern Mechanix and Inventions for January When Writing to Advertisers EARN Quick Cash Raising Mushrooms in cellar, shed, attic. We buy crops. Guaranteed materials furnished. Easy, Odorless method. Book Free. United, 3848-CM Lincoln Ave., Chicago. MEN Wanting Jobs on new construc- tion work in nited States, South America, other countries, write E. Moore, 1837 Hunter Bldg., Chicago. Enclose Stamp. MEN With Cars Wanted for Tea and Coffee Routes. No experience needed. Must be satisfied to make up to $32.50 weekly at start. Write Albert Mills, Route Mgr., 8910 Monmouth, Cincin- nati, Ohio. DISTRIBUTORS—Supply Revolution- ary Corn Remedy to stores. New Sales Plan results in landslide of orders. Up to 150% profit. Write for exclusive franchise. Reliable Specialty Corp., Buffalo, N. Y. WORK in Alaska, Complete instruc- tions for operating Diesel engines, steam and hydroplants, finding gold, trapping fur. All for $1.00, Ervin, 724, Juneau, Alaska. MERRY-GO-ROUNDS MERRY - GO - ROUNDS — New and Used Outfits — Catalog 10c. “Moore- made”, LaPeer, Michigan. MICROSCOPES RARE Microscope Bargains. Buy direct from Manufacturer and Importer. Larg- est assortment in America, DuMaurier Company, Dept. 141-A, Elmira, N. Y. ULTRALENS microscope 30-300-600X magnification (360,000 areas) $1.00 postpaid, guaranteed. 500X Pocketscope 50c. Accessories 50c. Optical catalog free. Pfleegor Laboratories, MM 1, Milton, Pa. MISCELLANEOUS FREE—Bargain Book—‘“Central’s Holi- day Specials” listing everything photo- graphic and a complete line of micro- scopes, telescopes, binoculars and weather instruments at lowest prices. Excellent gift items. Write now for free copy to: Central Camera Co., Dept. MME, 230 S. Wabash Ave., Chicago, inois. LADIES or Gentlemen: Open a “Foot Grooming Parlor” in your home. Com- plete course by correspondence. Evans Foot Institute, Montgomery, Ala. IMPORTED Jewelers’ saws (Laubsag- en) $.60 gross postpaid. Hartmann, 8907 244 St., Bellerose, N. Y UP TO $25.00 paid for. snapshots, pho- tos, amateur drawings. Needed by pub- lishers and advertisers. Send dime for list of subjects wanted. Artistographers Exchange, 401-MC Bedford Building, Chicago, BACK Numbers — Steam, Electrical Magazine, while they last, ten issues $1.00, prepaid. The Progressive Engi- neer, Malden, Mass. CALIFORNIA and the wage-earner. 48 pages 10c postpaid. Van Korlaar, 864 9th St., San Pedro. Calif. MANUFACTURERS, Distributors, Agents, Send me your catalog. Box 782, Elmsford, N. Y. BAR Bells. Make your own. Small cost. Plan 25c, Williams, 5304 New- port, Detroit. CALENDAR—13 months, 1935 (5x7). Get one and amuse your friends. Post- paid, one dime. Agents. Vogel, Milan, Missouri. CASH for used drawing sets, slide rules, microscopes, engineering instru- ments, scientific tools. Highest prices paid day shipment received. Satisfac- tion guaranteed or shipment cheerfully returned, Elman’s, 2304A VanBuren, Chicago. MODELS & MODEL SUPPLIES YOUR Ideas developed into practical, working model. 30 years successful experience; thousands satisfied custom- Confidential service guaranteed. Bank references. Send 3c postage for 32 page book “Making Inventions Pay.” Crescent Tool Company, Dept. T. Cin- cinnati, Ohio. OVER 50 engines; castings for Lecomo- tives, Gas, Steam Engines; Electrical Motors, Generators, Model Fittings; Miniature Valves—duplicates of large ones. Model screws. Send 25c for No. 17 Catalog. Canada, 30c. lst order. Howard, 2417 N. Ave., Chicago. BIG PACKAGE of model airplane samples. Send dime for packing and postage. Aero Shop, 3050 Hurlbut Ave., Detroit, Michigan. MOTION PICTURES HOME Movies—Easy terms—Cine Pic- ture Service, Box 94-M, McGaheys- ville, Virginia. 8MM FILMS—Mickey Mouse, travel, others. List for stamp. Lincoln Film Service, Box 293-C, Saginaw, Mich. LOWEST prices for all kinds movie film and equipment. Free developing. Send stamp for price list. Home Movies, Dept. M, 22 E. Van Buren, Chicago. BIGGEST bargains in films, projectors, cameras and accessories. Projectors $3.75 up. Films 35c up. Art sample 25c. Free lmm, 8mm lists. Home Movies, Box 32-M, Easton, Pennsyl- vania. LEARN the motion picture theatre busi- ness at home. Catalog N. Free. Theatre Institute, Elmira, New York. MOTORCYCLES PARTS. Send 10c for 24 page catalog. Listing new and used parts for Indian, Harley, Henderson, Excelsior. Special prices on chains, batteries, carburetors, accessories. Indian, 622 E. Grand, Des Moines, Iowa. ALLOY Pistons. Harley, Henderson, Indian, Excelsior. Used parts, catalogue and wings pin 10c. Ballak, 100 N. 12th, St. Louis, Mo. ENGLISH Motorcycle Books ‘‘Work- shop,” “Hints, Tips for Motorcyclists,” “Speed—How Obtain It,” “How to Manage Motorcycles,” $1.25 each_post- paid. Overhead speed heads for Fords. Send dime for sample copy Speedway Racing Magazine, catalog English racing and stock motorcycles $150 up. Crash helmets, supplies. Clymer, 430 West Pico, Los Angeles, California. MOTOR WINDING DATA MOTOR winders: winding data, 100 A.C, motors, special selection, various horsepower and voltage, $1.00. Motor Data Service, 3002 Monroe, Kansas City. Missouri. MOVIE CAMERAS FOR SALE 100 FT. ODD 16mm film $1.00. 400 watt Ampro projector $99.50, 200 Watt Keystone Projector $19.50. Trades Ac- cepted, silent, sound library. Free Mem- bership, Catalogue. Mogull Bros., 1944- G Boston Road, New York. OLD GOLD WANTED SPOT cash by return mail for old gold, discarded jewelry, dental gold, etc. Dulac, 3413 Columbus, Minneapolis, inn. SEND us your old gold teeth, crowns, bridges, jewelry. I pay more because I refine into dental gold. Satisfaction guar- anteed or shipment returned. - Licensed by United States Government. Dr. Weisberg’s Gold Refining Co., 1580 Hennepin Ave., Minneapolis, Minn. 135

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PATENT ATTORNEYS INVENTORS: Send immediately for your copy of our big, new Free book, “Patent Protection.” Forty-eight pages of interesting facts. Tells how Patent Laws protect you; kind of sketch. or model needed; simple steps to take with- out cost; how successful inventors have secured financial assistance; shows in- teresting inventions; illustrates impor- tant mechanical movements. Other men have read and profited by this book. With book we also send Free Evidence of Invention form, that you can use to establish date of disclosure. Prompt ser- vice, reasonable fees, special deterred payment plan. Strictest secrecy. Thirty- six years’ experience. Highest refer- ences. Write us today. The facts in our book are worth money to the man with a good invention. Address: Victor J. Evans &. Co., Registered Patent Attor- neys, 420-A, Victor Building, Wash- ington, D. C. INVENT something! New discoveries have cured previous depressions. Un- patented ideas can be sold. I tell you how and help you make the sale. Free particulars. Write W. T. Greene, 958 Barrister Building, Washington, D. C. FACTORIES must have new articles, why not yours? We keep up with The New..Deal—Square Deal. Associated Service, 18 E. 41st St., NYC. PATENTS PATENTS—Before too heavy an out- lay of time or money is made on an invention, a search of the Patent Office records should be made to determine as nearly as possible whether or not the same idea has been patented before. The cost of this search is small, while the value of the facts it uncovers is often considerable. We offer inventors and manufacturers a thorough, prompt, con- fidential search service—plus experi- enced counsel and assistance in every phase of Patent and Trademark practice. Write for my free book containing valu- able information relating to patent pro- cedure. Clarence A. O’Brien, Regis- tered Patent Attorney, 28-P Adams Building, Washington, D. C. INVENTIONS Wanted—Patented, un- patented. If you have an idea for sale, write Hartley’s, Inc., Box 928-J, Ban- gor, Maine. INVENTIONS Cémmercialized, Pat- ented or unpatented. Write Adam Fisher Company,.582 Enright, St. Louis, Mo. PHOTO DEVELOPING FILMS developed 5c per roll; prints 3c each. Ask for Special Bargain List. Roanoke Photo Finishing Company, 159 Bell Avenue, Roanoke, Va. POEMS—SONGWRITERS WANTED: Original Poems, Songs. MMM _ Publishers, Studio Bldg., Port- land, Ore. PORTABLE COMMUNICATION NEW device uses two flashlight cells— transmits voice, code over mile. Small, efficient, $2. Circular free, Esco, Provi- dent, Tacoma, Wash. PRINTING 1000 CARDS, Blottercards, Tickets $1.40. 500 Letterheads, Billheads, en- velopes, statements $1.75. Illustrations. Anything printed. Bredshaw, 3214 Huron, Chicago. 1000 NEAT Business Letterheads. $1.50 per 1000, Dodds-A, Cedar Rapids, Ia. 500 BUSINESS Cards $1.00 prepaid. 42 East End, Buffalo, N. Y. 1000 LETTERHEADS, 500 envelopes $3.50. Select service. Outdoorman’s, Coeur d’Alene, Idaho. RADIO — | 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. FOREIGN Reception Guaranteed! Sen- sational radios, wholesale price, Bart, Knoxville, Tennessee. TELEVISION set complete for $1.00. Easy how to build instructions 25c coin and 3c stamp. Arthur M. Pohl, 2135 Hubbard Ave., Detroit, Mich. SHORT Wave Transmitters, Receivers, Accessories. Wholesale Catalog 5c. Fed- eral Telegraph, Box 344A, Indianapolis, Indiana. : SHORT and long wave, heart shaped cabinet, receives foreign stations. Price $15. Ballard’s Radio Mfg. Co., Sapulpa, Okla, 59c BUYS “Match Box” Radio Kit. Plans 10c. Louis, 5000-8, Philadelphia. RAZOR BLADES SPECIAL Offer. 10 Blue Steel—Double Edge Razor Blades with price list—10c. Other special bargains. Write today. Nalpak, 3225-G, Crystal, Chicago. GET your own paients; legal blanks, complete instructions $1. Cudding Sons, Campbell, Calif. PATENTS. | Booklet free. Highest references. Best results. Reasonable fees. Watson E. Coleman, Victor Build- ing, Washington, D. C. PATENTS Wanted—Let us introduce your patent to hundreds of people who have money to buy or develop them. Representatives in many cities. Write today. A. M. Bowen, 2035 Broadway, San Diego, Calif. $ OUR Book tells you how to get your own patents, Only 50c. Matteson, 600 University, Syracuse, N. Y. PERSONAL FORTUNES await unlocated heirs! Authentic list, 25c. International Agen- cy, Cincinnati. POEMS set to music. Published. Mc- Neil, Bachelor of Music, 1582C West 27th St., Los. Angeles, Calif. HIGHEST Prices Paid for domestic and foreign stamps. Send 10c for list. Mona Vanna, MC-203 South Dearborn, Chicago. DEVELOP your personality. Free in- formation. Flow, 6618M Quimby, Cleveland, Ohio. 136 RAZOR Blades sharpened like new, Ic each. Pete Wetterquist, Rockford, Tllinois. REAL ESTATE OZARKS—Five acres timbered river frontage, fishing, boating, pearling, shooting—$100, $5.00 monthly. Hub- hard, 224 Grossman Bldg., Kansas City, ans. ROOTS AND HERBS JUST OUT! World’s greatest “Herb Almanac.” Beautifully illustrated in natural colors. Contains over 500 old- fashioned herb medicine recipes and In- dian secrets for home use. 10c (coin) postpaid. Worth dollars! Bontanics, 145 W. 112th St., Chicago. WANTED—Common weeds by steady buyers! Details 10c International Agen- cy, Cincinnati. RUBBER STAMPS NAME and Address 25c. Three lines 35c. Ideal Stamp Works, Coeur d’ Alene, Idaho. SHOP KINKS HANDY Man’s Home Manual. Send 50c to Modern Mechanix and Inven- tions, 529 S. Seventh St., Minneapolis, Minn. K SPECTAOSCOPES SPECTROSCOPE showing sun’s double sodium line, moon’s rainbow, scores brilliantly colored metallic spec- trallines. New invention, postpaid $2.50. Cutting Sons, Campbell, Calif. STROBOSCOPES STROBOSCOPE complete with electric motor, neon light, and motor book of 100 stunts $1.25. Cutting Sons, Camp- bell, Calif. SALESMEN WANTED MAKE Big Money steady, high grade coveralls, shopcoats, pants, shirts, sum- mer suits. Advertising on back. Fast sellers. Prospects everywhere. Free out- fit. Strong Mfg. Co., 901 West Jackson, Dept. C-12, Chicago. MEN WANTED at once to call on stores with newest line self-selling 5c and 10c necessities, Strong, original counter displays. Aspirin, Mercure chrome, razor blades, household cement, etc. Automatic sellers. Many new items. Up to 125% profit. Big catalog Free. Procopax, Dept. 95-ED, 1956 S. Troy, Chicago. CALL on Gas Stations, Garages, Stores: New Chemical Sponge, whirlwind seller. Cleans automobiles without work. Phe- nomenal profits. Outfit Free. Kristee, Box 2502, Akron, Ohio. DON’T be a Job Hunter—Start your own business on our capital. No hard times; no lay-offs; always your own boss. Hundreds average $3000 to $5000 annual sales year after year. We sup- ply stocks, equipment on credit. Over 250 home necessities. Selling experience unnecessary. Wonderful opportunity to. own pleasant, dignified, profitable busi- ness backed by world-wide Industry. Write Rawleigh, Dept. A-U-MOM, Freeport, Ill. LARGE, steady profits. Make-sell amaz- ing anti-freeze non-evaporating sclution for autos. Will not freeze at 25 below. Made in few minutes for little as 10c Send only 25c today for for- Allied Research, 2217 N. Kil- bourn, Chicago. WANTED: County Salesman with car, to demonstrate and service for large Ohio manufacturer, First-Class job. 242 Fyr-Fyter Co.. Dayton, Ohio. TATTOOING OUTFITS AMATEUR Tattooing outfits, plug in light socket, also battery sets. Free List A. Chicago Tattoo Supply House, 651 South State, Chicago. WELDING ARC-WELDING Outfit $1.25. Weld fenders, braze, solder. Lavrow, 4368-W, Warren, Detroit. Stamp appreciated. ATTENTION Welders! Build 200 amp. electric welding generator from two Dodge generators or 110 A. C. Welding transformer from scrap material, Guar- anteed simplified blueprints and instruc- tions, $1.00 each. ‘‘Buildit’’, Box 1181, Denver, Colorado. WIND BATTERY CHARGER WIND Electric Charger. Build your- self from our kit of parts, or send $1.00 large blueprints. Lorenzen Propeller Company. Niles, Michigan. WIND ELECTRIC LIGHTS ELECTRIC Lights—Wind Driven. You build them. Simple direct drive. Auto- matic control. Copyrighted blueprints. Write. Wind Motor Electric, Ridgway, Montana. BUILD your own parts and building plans cheap. Particulars, dime. Klinsick Mechanical Shop, Optima, Okla. PROPELLERS for auto and 32-volt generators. Details 10c, refunded on order. Propeller Man, Kindred, N. D. Thank You for Mentioning Modern Mechanix and Inventions for January When Writing to Advertisers

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Hockey—Fastest Game on Earth (Continued from page 57) left and right defense. As in basket ball, the wings are commonly called forwards and the defense men, guards. The center is the key-man of the team. When the referee drops the puck at the “face- off” which marks the opening of each period, his job is to capture the frozen disk and shoot it to one of the wings who flashes. down the ice toward the enemy’s goal. The guards, or defense men, are teamed with the goalie. Operating in the end zone, they are responsible for the protection of the goal. Should a fast-moving wing elude them, the goalie is expected to stop the flying puck with stick or body. Mile-a-Minute Pucks Possessed of razor-sharp edges, the hur- tling puck becomes a murderous weapon in the hands of a hard-hitting wing driving for the goal. At the height of his career, Walter Johnson, speedball pitcher of the Washing- ton Senators, hurled a baseball 50 feet in half a second; but this amazing record was al- most equalled by Babe Dye, National league hockey star, who shot a puck the same dis- tance in 6/10 of a second. Three periods of 20 minutes each are re- quired to complete the game, except in case of a tied score, when overtime periods are played. Yet although the playing time is com- paratively short, the physical toll is so ex- cessive that the average lineman will remain in action scarcely more than three or four minutes at a time before being replaced by another player. These substitutions are one of the reasons for the frequent halting of play which is so puzzling to many spectators. Various other interruptions, penalties and fouls serve to confuse the spectator. The game may suddenly be halted and a player nowhere near the puck may be waved to the sidelines, forcing his mates to continue the battle shorthanded. In this instance, the referee has detected a violation of the rules and has penalized the team by putting the offending player out of the game for a given time. Three Types of Hockey Penalties There are three types of penalty in hockey —minor, major and match. The penalty for a minor foul eliminates a player for two minutes; for a major foul, five minutes; for a match foul, the balance of the game, with a substitution after twenty minutes. Minor fouls include tripping, holding, run- ning or jumping, loafing, interference, delay- ing the game, hooking with the blade of the stick and many similar infractions. Major penalties are imposed for charging at an opponent from the rear, throwing a stick, body-checking (throwing an opponent to the ice), injuring another player by cross- checking (barring the way with stick held across body) or starting a fight. Match fouls occur when a player deliber- ately injures an opponent, kicks another play- er or interferes with, or strikes, an official. Thank You for Mentioning Modern Mechanix and Inventions for January When Writing to Advertisers MATHEMATICS . the key to all — RRA b ILA LILAR Palmers W i =f famous home Ù study course _ available: made plain in these books Help your advancement in technical § or scientifc work, Learn mathematics. Palmer’s course makes it easy to master the essentials. Shows how to use them in your daily work. Over 216,000 copies sold. A Self-Instruction Course for Practical Men Palmer’s simple, step-by-step treatment carrles you from first essentials to work- ing knowledge of all mathematical meth- cds. Even makes clear the practical uso of calculus. Ccurse based on Palmer’s years of trade school teaching: gives thou- sands of exercises and problems with answers based on every-day questions prac- tical men brought to him for solution, Study at Home; Pay As You Go A few minutes a day will glve you prac- tical command of this important subject. See entlre course without sending a cent in advance, Pay only $1.00 in 10 days and $2.00 monthly for three months if you keep the books. If you have ever felt the Inck of a working knowledge of practleal mathematics, send the coupon at once and look over the Palmer Course. Payments —— a a a oe —— — — McGRAW-HILL ON-APPROVAL COUPON McGraw-Hill Book Cc., Inc., 330 W. 42nd St., N. Y. C. M ulus Home Study Course days’ examination on approval. In 10 days I will send $1.00, plug few cents postage and delivery, and $2.00 monthly for 3 montha, or books postpaid. (We pay postage on ordera accompanied by re | mittance of first Installment.) with practical applications Sent for Examination No Money Down Small Menthty n B A| B o 5 we "uy Bi 3 3 5 y p -B 2: 8 Learn Public Speaking At home—in spare time—20 minutes a day. - Overcome ‘‘stage-fright,”’ gail N Ee a A epee! . 10" Booklet, How to Work Wonders With Words NORTH AMERICAN INSTITUTE, Dept. 2051 3601 Michigan Avenue Chicago, Hinols paN Complete, practical home-study j courses prepared by some of the a best-known chemists fn this country, : including ALLEN Rocers, B.S., M.S., Ph.D.—Head of Department of In- dustrial emistry, Pratt Institute; L. M. TOLMAN, Ph.D.—Formerly Chief Chemist, Wilson & Co. Now : ie =~ president, aoe Se Chemical an rganic yen Products Co.; BRADLEY STOUGHTON, B.S.— | Head of the Depart- ment of Metallurgy, Lehigh University, an Owen L. Suny, Ph.D. —Professor of Applied Chemistry, University of Pennsylvania, Associated with the {tnternatlonal Correspondence Schools Box 2324, Scranton, Penna. Without cost or obligation, please send me full details of your home-study course O Analytical Chemistry O Chemical Engineerin 5 Phar Industrial Chemistry Short Chemistry Course macy Address., 137

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FOR INVENTORS. And Mechanical 138 Minded Men > Answers to -o im Ge mi ea 10 Questions on Page 29 By patenting the invention. Send sketch or model and descrip- tion with search fee to a registered patent attorney. 1101 U. S.—1279 Foreign. Abraham Lincoln. 17 years. It confers on patentee the exclu- sive right to make, sell and use the invention covered by the patent. No. Pencil sketch and description will usually suffice. A form on which an inventor may execute his sketch and descrip- tion. When properly filled out it is documentary evidence of your conception of the invention. Because a layman or a lawyer in general practice is not learned in patent office practice. As soon as patent application covering the invention is filed in United States Patent Office and official receipt received. CLARENCE A. O’BRIEN Registered Patent Attorney 317-R Adams Building Washington, D. C. (Copyright Clarence A. O’Brien) Small Ideas May Have Large Commercial Possibilities If you hope to realize profits from -your invention, you must protect it with a United States Government Patent. Otherwise you may find that all your time and labor z A have been lost, because it often hap- pens that other inventors are work- ing on the same idea. If you have an idea, take steps to get a patent at once! THE Free Book shown here was pre- pared for inventors, to show them exactly. what steps they must take to secure a PATENT. If you have an idea, you should send for this book AT ONCE. It will tell you exactly how an application for a Patent is made, what infor- mation you must furnish your attorney, and what steps he must take in order to protect your interests. Remember, inventing an article is one thing—secur- ing the exclusive right to manufacture it, use it or sell it is another. Without a U.S. Patent, you cannot expect to reap the profits that your mvention may make possible. Send at once for this book. After you get that, you'll know exactly what to do to protect yourself. Thank You for Mentioning Modern Mechanix and Inventions for January When Writing to Advertisers

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+ KNOW HOW to START KNOW EACH STEP to TAKE Before Going Too Far With Your Ideas Very. often, the patent procedure is what we call a “simple” one—as illustrated here. My FREE BOOK “How to Obtain a Patent” describes what to do and ‘how to go about it. Send for it by all means—let me urge, however, that you take the first step (STEP NO. 1 to right) without further delay. It will prevent wasted work, mis-steps, and going ahead “in the dark’—your whole patent procedure depends upon the first step. a 5: Immediate Search Necessary A Search at the U. S. Patent Offce will disclose one of three things: That you have hit upon an entirely original idea— that you have suggested patentable improvements upon an existing invention—or that your invention has been anticipated throughout, and you should drop it. You should have this information at once. The Search Fee for the First Step (the search) š r . n is only $5. The next steps z Soe eee Zener (the whole procedure of 5 = 3 ae obtaining a patent) will ži en i OD be thoroughly explained to SEAS po O iis you in my FREE BOOK. o- 3 ‘My FREE BOOK tells everything TAS A ia you need to know about patents. I : j will mail this book upon receipt of a pres SEs tees your letter requesting search—or if you p a want to read it before having search $ A made, simply fill out the coupon below. ce = ALSO FREE RECORD OF ee INVENTION BLANK This FREE Record of Invention Form en- ables you to make in convenient form a sketch of your idea and have it witnessed in a manner of value to you should the occasion for evidence arise. MAIL THIS COUPON TODAY and obtain my FREE BOOK and Record of Invention Form. | as an Sp UP GY GE ND cee a es | z3 z > = l5] 317-R ADAMS BUILDING WASHINGTON, D.C Please send me your FREE BOOK, “How to Obtain a Patent,” and your “Record of Invention” Form, without any cost or obligation on my part. (Important: Write or print name plainly) STEP NO. 1 Make a rough pen- eil sketch of your invention, describe it fully, and send it to me for prelimi- nary search through U. S. Patent Office —fee $5.00, STEP NO. 2 My trained search- ers will then make a preliminary search of the pertinent U. tion is probably pat- entable, STEP NO. 3 My complete report of search and opin- jon on patentability will be mailed to you with copies of U. S. Patents that I consider nearest to your invention. STEP NO. 4 If you decide to make patent appli- cation, for customary fees explained in my booklet, my drafts- men will make draw- ings and proper pa- pers will be pre- pared for presenta- tion of your inven- tion to the Patent Examiner. CLARENCE A. OBRIEN “REGISTERED PATEN: TORNEY Thank You for Mentioning Modern Mechanix and Inventions for January When Writing to Advertisers 139

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se FREE TUBE ATLAS SAVED AND THEY ARE GUARANTEED È FOR A WHOLE #4 YEAR! a . ATLAS SUPER VALUES This old telebe com nyis first choleewlth thousands of m tay myi demand highest quality at lowest cost Ack D roug! est roada prove that standard brand tires recon- structed by the aclentifie siete deliver 60 to60% moreservice. Order to: „Save money eo TIRES Size Rim Tires Tul 20x4,40-21 $2.15 $0,85| 30x 29x4°60-20 2. ian 30133 Tas ho o paa ba bm Bei pa e 1 ma O D D CO OD ODO RAAI ANA toratitatas 60 BUWVUWUWUNNNNNNNNNE NNPAHVUNVOOCDOUAA: UANSONAUUVOMNOUS: Ht ett et pat ed pt rot eS D O OC TRUCK BALLOONS 6.95 3.73|GUARANTEED O Deposit with each tlre ordered ($4.00 depoelt on each truck tire), Balance C.O.D, If you send caah in full deduct 5% Year's service guaranteed, or replacement at 4 price. Order today. ATLAS TIRE & RUBBER CO., Dept. 4623 6250-S2 SOUTH MORGAN STREET, CHICAGO, ILLINOIS BUILD AN AUTO TRAILER Plans in 1935 Handy Man’s Manual Send 50c to Modern Mechanix Publishing Co. 529 S. Seventh St., Minneapolis, Minn. “AMERICAN JUNIOR” POWER TOOLS A sensational New Deal in Power Tools— Now EVERYONE Can Have a Completely Equipped Shop for a few dollars. Mass production, big sales- volume and improved designs permit this amazing value. Not teys, but MASSIVE GREY IRON CASTINGS AND STEEL —workable, sturdy, unconditionally GUARANTEED to do the work intended: LATHE (i ening. 12 c., extra lengths 50c per ft.; canters 35¢ ertrar other accessories include chucks, saw-table, face-plates, DRILL PRESS 16k Shan OF raine dalines chuck to base 7", a 9-32"" drilla; chucks 506, swinging table 35c. BENCH SAW sdivetable for depth cut, takes 5! blades: SABRE SAW ? docs all Scroll end band saw work Cethi RA Disc SANDER with Table Suiting 45 degrees up or down, d for finishl ti ding, buf} moat useful at read p aa manor nding. bu SPINDLE SHAPER ‘ takes a x 6-16" cutters, does all EACH MACHINE. SE 50, COMPLETE Hoi 96-page FREE “American me ers ual’ P: Illustrated Instruction Book SD” free with every purchase, Customers also receive FREE the ‘‘AMERICAN HOMECRAFTER," our how-to-make-it periodical, a digest of the best construction stories and home workshop ideas in all the monthly magazines, Send cents stamps for catalog of our full line, manang 6” Metal Work. ing Lathe 58, ae and other tools, and sample co ‘American Home- EED. 1 pag d $1 deposit on any machines, Balance plus express AMERICAN PACHINE & TOOL co. O Broadway Dept. (2.x. 140 New York, N. Y. Build World’s Largest Earth Fill Dam (Continued from page 60) would cover the entire state of Connecticut to a depth of 6% feet. Because of the dam’s earthen construction, no water will pass through or over the struc- ture. Instead, the enormous head of water “will be routed around the east side of the dam through four diversion tunnels with an inside diameter of 26 feet. Capable of carry- ing the entire flow of the Missouri at high stage, each of the tunnels will be equipped with two control valves, housed in shafts 242 feet high, reaching from the top of the bluffs to the tunnels below. To supplement the tun- nels, a spillway about 342 miles east of the dam site is to be built to carry unusually heavy heads of water. Bridge to Become Dam’s “Heel” Over the downstream face of the dam the Great Northern railroad has erected a steel truss bridge for the transportation of dam materials over a special spur track from Wiota. About 9,000,000 tons of material, re- quiring about 4,000 50-car trains, will be moved over this bridge which will eventually become part of the dam’s “heel.” Four factors prompted the building of the Fort Peck Dam: Flood control, river naviga- tion, power production and irrigation. Of. these, the first is most important. During the past century, disastrous floods along the low- er Missouri have damaged agricultural lands to the extent of $75,000,000. The new dam will hold the ravaging waters in check and reclaim about 230,000 acres of swampy and untillable land whose potential value is esti- mated at more than $11,000,000. In addition to ending the flood menace, the impounded waters, released as required, are expected to maintain a navigable channel in the Missouri river from 8 to.9 feet deep and 200 feet wide. This channel will open the Missouri to navigation for eight months of the year from Sioux City, Iowa, to St. Louis, Mo. Provisions for Power Output Power has been a secondary consideration in construction of the Fort Peck Dam; but under a normal head of 150 feet of water a hydroelectric plant is expected to deliver an output of 50,000 kilowatts. Provisions are being made for the installation of other units which will eventually deliver a power sup- ply of more than 400,000 kilowatts. No extensive irrigation plans have been made in view of the present government crop reduction program, but it is estimated that the dam can irrigate about 180,000 acres. About half of this acreage may be fed via a gravity flow canal; the other half by means of a pumping system which utilizes power available at the dam site. The dam will span the Missouri at a point 23 miles southeast of Glasgow, Montana. Initial work on the huge project was started October 23, 1933. Engineers estimate that five years will be required to complete the vast undertaking; but once completed, the dam will last for a thousand years, harness- ing the Missouri for the benefit of fourteen generations to come. Thank You for Mentioning Modern Mechanix and Inventions for January When Writing to Advertisers

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Workshop Hobbies Win Success (Continued from page 34) would like to cite a classic example of a plan which took years to formulate but which eventually was used to build something that helped to win a war. In the early days of the Packard company, we manufactured comparatively few cars for the comparatively few buyers who demanded the precision and excellence of hand work- manship. Gradually, a few of us began to realize that many more people would buy Packard cars if we could devise machines which would do hand-precision. work more cheaply and rapidly—in other words, if the manufacture of fine engines could be put on a mass-production basis. Building Precision Tools In the pursuance of our plan, we designed and built a diamond-edged drill, which cuts the bearing within precision limits of one ten-thousandth of an inch. This was more economical than the hand method, and actu- ally produced a smoother, morc perfect bear- ing. This method is almost universal among automobile makers today. Our plan was finally ready, and we were on the point of putting it into operation when the tremendous events of 1914 interrupted it. The warring nations of Europe needed motor trucks. And for three years we built Packard trucks as fast as we could put them together. Then it became apparent to us that the United States, if drawn into the war, would need, more than anything else, a powerful, light air- plane engine in great numbers. In other words, America would desperately need mass production of a fine piece of machinery— the very thing we had so carefully planned. Birth of the Liberty Motor The result was the development of the Packard “905”, designed chiefly by Col. J. G. Vincent, vice ‘president in charge of engi- neering. The “905” was a watercooled V-12, the most powerful aviation engine that had been produced in America, and the lightest, per horsepower. When the American declaration of war came, we were ready. The plan for mass pro- duction of fine machinery was presented to the government, together with our designs for an all steel 12-cylinder aviation motor. From this design grew the famous Liberty motor. Using our production plan the gov- ernment began to turn out these motors in half a dozen factories. And when the guns were once more silent on the western front, Marsha! Foch declared that mass production of the Liberty motor had been a real factor in the victory. After the war the mass-pro- duction plan was at last applied to the build- ing of Packard passenger cars. My example has run to some length. But it will serve to show the importance of plan- ning things in advance. And that is the big lesson anyone can learn from having a work- shop in his home and building things with his own tools. Every time I go into my shop, the place says to me: “If you would build, plan!” Thank You for Mentioning Modern Mechanix and I nzentions for January When Writing to Advertisers KON AOR NONI a 1 a oA A-C-RADIO TELEVISION -EVERY ELECTRICAL SUBJECT COVERED Here’s great news for anybody interested in Electricity. BRAND NEW edition of Applied Electricity brought right down to date with every NEW Electrical subject fully covered. 10 big Volumes and all shipped FREE for examination. RA BIG FIELD! Big Demand! a Men who understand electricity Big Pay! are urgently needed right now in thousands of anaustries: Autos, _2iplanes, machine shopa— practically every industry depends or eae arene on slectriclty y and men who know this subject, wake e most complete big mon Pleasant, fascinating work, easy to learn work of its kind and do: ‘learn airkly with these books. Send coupon ever published, for a get for F z examinetion and see for yourself, Dynemos, motors, A year's congulting, membership in the Amenran, Techni So- ciety now given free to all Noe: cra of Tite fa amana 1s Cyclopedia o of By, ta power stations, on Hia thas eoet of books,” For Beginners radios, televislon, everything elec- trical explained clearly so Bnyone aa AMERICAN TECHNICAL soci IETY Dept. E1320, Drexel at 58th St. chicago SS a a American Technical Soclety, Dept. E1320, Drexel at sath S St., € oy Chicago Send for 10 days’ free use, BRAND NEW 10 volume eet of Electrical Engineering. In return for mailing this coupon prompt! in the American Technical Society entitling one year. I will p: m În 10 days and owe you nothing, but if I aend free, certificate of membership me to fall I consuléing privilege ‘for the few centa delivery “changes on ths: books. If I wish I may p them J willsend $2,00 9.80 le paid. after 10 daya, then $3.00 a month untl] the special buses Of only Attach letter stating age, occupation and name and address of employer and at least one business man as reference. | Tae a BIG PROFITS IN “NUFOND GIANTS” Breeder lays 10,000 eggs each year, Bullfrogs B séll $3.00 dozen. Backyard pond starts you. Raised in any cli- E3 J mate. Our FREE, illustrated book “‘A Fortune fe 4 in Frogs” explains everything. Write today! AMERICAN FROG CANNING co. 2 “Originators of CANNED Frog Legs” Dept. 119-A New Eons, La. No experience necessary. 141

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INVENTIONS WANTED! Patented or Unpatented . This amazing new Book, Inventors’ Sell- Ing Gulde, tells how to make money with patented or unpatented ideas. In- cludes names and addresses of hundreds of manufacturers actively in the market for ideas. Tells how inventors may pro- tect their ideas for small sums, how costly dis- appointments may be avoided, ete. Book covers Proved Methods of Selling, Finding Buyers, Royalty Contract, Legal Pitfalls, Financing, Gyp Schemes to Avoid, Patent Office Methods, and many other vital topics. A complete encyclopedia for the in- ventor, written by Raymond Francis Yates, who has helped $ over 30,000 inventors. Durably bound in leather-finish fabric 2 —malled postpuid for only $2. (Or, C.O.D., pay the post- man $2 plus a few cents postage.) -FREE Market Analysis of Your Invention For a limited time, each copy of the Inventors’ Selling Guide con- lains a certificate entitling purchasers to Mr. Yates’ expert market analysis of their ideas—estimated sales value, selling recommenda- lions, ete. FREE LIST OF NEEDED INVENTIONS for which manufacturers will pay big money mailed on receipt of 3c postage. DONLEY PUBL, CO., Dept, M1, 509 Fifth Ava., New York, N. Y. TYPISTS Extra Money for your spare time copying Radio Scripts, others. Interesting work. Good pay. Ex- perience unnecessary. Free Particulars. Write, enclosing stamp, to taa TYPISTS’ ASS’N, 1838 Hunter Bldg., Chicago INVENTORS SEE PAGE 12 BUILD AN AUTO RADIO Send 50c for blueprints to Modern Mechanix Publishing Co. 529 S. Seventh St., Minneapolis, Minn. Big new field — one of few that prospered wine’ depression — offers well-paid jobs ature to men trained in selling’ installing, gervi Ing Thousands of new units being sold — ana installa io Jomes, stores, offices, rad ee gl Ae AY for Free Bulletin. No obligation. ~ American School, Dept. ER128 Drexel at Seth, ue STOP Your Rupture Worries! Why worry and suffer with that rup- ture any longer? Learn about my perfected invention, It has brought ease, comfort and happiness to thou- sands by assisting in relieving and curing many cases of reducible her- nia. It has Automatic Air Cushions which bind and draw the broken parts together as vou would a broken limb. A obnoxlous springs or pads. io salves or asters, urable, C. E. Brooks, Inventor cheap” Sent on trial to prove it. Beware of imi- tations. Never sold in stores nor by agents. Write today for full information sent free in plain, sealed envelope. H. C. BROOKS 136 State St., Marshall, Michigan 142 Fortunes in Needed Inventions (Continued from page 87) automobiles. Families with two smäll youngsters would be quick to see the advan- tages of such a thing. It would be a fast sell- ing number at one dollar each. Looking at such a simple thing as a coat hanger one would never dream that this is one of the most inefficient things in use to- day. Men may not realize this fact but the ladies do. Due to the fact that female gar- ments are lighter and have less body than do male garments, they will not remain in position on the coat hangers that we have today and many a lady goes to the clothes closet only to find her newest and most ex- pensive gown lying on the floor in a wrinkled heap. The chap who can help the ladies out will be handsomely rewarded. There is need- ed a coat hanger that will also be a foolproof dress hanger. During the past five years people, especial- ly in this country, have become very con- scious of such a thing as air conditioning. We have arrived at the psychological time for the introduction of an improved window ventilator that would permit a free entrance of air but that would at the same time pre- vent dust, rain and snow from entering, to say naking of insects. The man who can supply the less fortunate families of Ameri- ca with a poor man ’s air conditioning system is sure to make a fortune. Special Built Plane Wins Air Race (Continued from page 40) show how quickly passengers could be car- ried from Europe to Australia in comfort, they were given little chance of winning. Yet the Douglas, carrying four passengers, including Miss Thea Rasche, noted German aviatrix, landed in Melbourne in second place after stopping at more than twenty cities, compared to the five stops of the Brii- ish winner. Its feat led the London Eve- ning News to hail the ship as the wonder of the race, stating “It gives irrefutable, tragic proof, that we are miles behind other coun- tries in commercial air transport.” The Boeing flown by Turner and Pangborn was also acclaimed because it, too, had ‘made many stops at checking points along the way greatly increasing the distance flown. The streamlined British racer with cramped quarters for only two pilots won by flying non-stop between the control points, disregarding checking points entirely. The British team arrived in Melbourne weary, bearded and grimy. They had had only two hours’ sleep during the entire trip. In con- trast the Dutch team and Miss Rasche arrived in Melbourne neat and refreshed, The winning plane was one of three built by Capt. Geoffrey de Havilland, noted de- signer of the famous D. H. 4 World War planes. De Havilland built the ship especially for the race. He offered it to entrants for $25,000, but refused to reveal details of the “mystery” ship until it was completed. Pur- chasers knew only that the ship had two mo- Thank You for Mentioning Modern Mechanix and Inventions for January When Writing to Advertisers

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Special Built Plane Wins Air Race tors, would seat two and would fly in excess of 200 miles an hour. The three planes were entered in the race. One flown by Amy and Jimmy Mollison took an early lead in the race but lost it at Karachi and finally dropped out at Allahabad due to motor trouble. Scott and Black in their D. H. Comet overtook the Mollisons and held the lead to the end of the race. The third Comet, flown by Cathcart Jones and Ken W. Waller, was the fourth ship to land in Melbourne. One remarkable feature about the new De Havilland is the low power motors. The racer was equipped with two special Gipsy Six motors each developing only 225 horse- power. In comparison the American Douglas was powcred with two 700 h.p. Wright Cy- clones, while the Boeing of Turner and Pang- born had two 550 h.p. Wasps. The D. H. Comet is built entirely of wood, unusual in this day of metal ships. In the race it carried three-quarters of a ton of gasoline. The Comet Earns Its Name The estimated high speed of the new ship is 250 m.p.h. and with its full load of gaso- line has a cruising range of 2,500 miles. The unusually thin, narrow tapering cantilever wing of the Comet does not exceed a depth of 11 inches. e Loaded, the Comet weighed 5,250 pounds, coming within the weight regulation of less than 5,400 pounds for the race. It also met the take-off requirement. Each entrant had to clear an obstacle 66 feet high 656 yards from the start. The Dutch Douglas was a stock liner, un- altered for the race. Its cabin was sound proofed so that passengers and crew could carry on normal conversation and sleep in comfort. The ship will be used on K.L.M.’s airline from Holland to the Dutch East In- dies. As a result of its performance in the race the Dutch company ordered ten similar planes for its air routes. In addition Douglas expects to sell 40 more to other transport companies. The Boeing was a stock plane also, but its passenger seats were removed to provide room for additional gas tanks. When it weighed in, it was found to be overweight. To meet the weight requirements Turner had to tear out the sound proofing materials, seal up a 90 gallon gas tank, and replace the glass windows with composition material. How the Prizes Were Awarded The Dutch team was awarded first prize of $10,000 in the handicap race. Turner and Pangborn won second prize, $7,500, in the speed race. The Comet of Jones and Waller took third prize of $2,500 in the speed race, while another De Havilland, a Leopard Moth, flown by C. J. Melrose, placed second in the handicap race. and won $5,000. In 1933 Wiley Post accomplished the amaz- ing feat of flying around the top of the world, 15,400 miles, in slightly more than seven days. The winning plane in the Mac Robertson race could fly the same distance in four days! Tt could fly around the equator, 25,000 miles, in 6% days. Thank You for Mentioning Modern Mechanix and Inventions for January When Writing to Advertisers Play A Tune In 10 Minutes A On your Spanish Guitar, Uke, Tenor Banjo, Mandolin or Banjo Mandolin. No knowledge of music necessary. No practice. Play first by number, then by note. Simply attach E-Z Player to your favorite instrument — press num- bered keys and play. FREE instruction book with 2 numbered tunes and chords comes with every E-Z Player. Start playing popular tunes by number right off the reel. Be the life of the party—the center of attraction—a radio star. Don’t wait. Write today for 3-Day Free Trial Offer and Spe- cial Guitar Values. A postcard will do. FERRY SPECIALTIES, INC. Dept. 261 Evanston, Ill, Z. H; POLACHEK | Raab y full informutlon OUR IDEAS ff fte4 BROADWAY J | spor ite REGISTER YOUR 31s NEW YORK | Protection with- TRADE:MARK ay out obligation. BEG. PATENT ATTORNEY PROE ENGNEER | Nome WHAT IS YOUR INVENTION? Send me a simple sketch of a model for | Addresa CONFIDENTIAL ADVICE—DO IT NOW! |., MAKE MONEY - At Home lt E+N steady income each week, working at home, coloring photos and miniatures in oll. Learn famous “Koehne Method” in few weeks, Work done by this method in big demand. No experience nor art talent needed. Many become independent this way. Send for free booklet, “Make Money at Home.” NATIONAL ART SCHOOL Inc. 3501 Michigan Avenue, Dept. 2051, Chicago, Ilinois INVENTORS ESN PATENT YOUR IDEAS SEND FOR FREE BOOK mmmmmò HOW TO OBTAIN A PATENT, written by a Former Member of the Examining Corps (1922-24) of the U, S. Patent Office, If you want to profit by your idea, you should take steps to apply for a U.S. Patent at once. Your first step is to get this Free Book. This interesting illustrated book contains valu- able information youshould have. Itteils you fully how to obtuin a patent on your idea in the quickest way. With this Free Book you will also receive a “Record of Invention” form on which you can easily record youridea. Personal and Confidential Service: Your case will be personally handled only by a Regis- tered Patent Attorney who is also a Former Member of the Examining Corps of the U, S. Patent Office. All communications will be strictly confidential. MAIL COUPON TODAY FOR FREE PATENT BOOK AND RECORD OF INVENTION FORM MILLER & MILLER. REGISTERED PATENT ATTORNEYS. FORMERLY IN EXAMINING CORPS U. S. PATENT OFFICE ATE 1638 Woolworth Bidg., Dept. 158, New York City MILLER BUILDING, Dept. 15B, WASHINGTON, D. C. j Please send me your Free Book, ‘How to Obtain a Patent,” and l “Record of Invention” form. { DDRESS.sssscosseccnssccencantcnnssoesorr acon cacsncaeasenenenssssseae cuss nweennss seeeunes OEE ee ee ee ee ee es ee ee ee 143

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he Mi Tg Mia Wallace Beery is now at work on what many believe will be the greatest role of his long film career—the part of P. T. Barnum in the screen story based on the circus magnate’s remarkable life. You’ll enjoy the advance showing of Wally and his co-players in this great picture in the Januar” issue of SCREEN PLAY. There ate many more great stories about Mae West, George Raft, Virginia Pine, Mady Christians, Barbara Stanwyck, Leo Carrillo and others, plus a wealth of latest news and personality pictures and THREE GREAT CONTESTS. Fomor at All News stands 144 Seek Sunken Gold Near Broadway (Continued from page 65) mer, according to the engineers’ predictions, the mystery of the Hussar will be solved. Skillful engineering work and the science of diving are the important factors in the fight to recover the Hussar’s gold. Simon Lake, 68, veteran inventor, is the master mind behind one of the corps of men engaged in the Hussar job. He has invented and constructed a salvage submarine which is attached to a “mother ship” to use in the operations. Its main fea- ture is an access tube, 115 feet long, equipped with hoisting apparatus. The Lake salvage submarine itself is 22 feet long with a 9-foot beam which is con- nected by the access tube. The craft is fitted with a diving compartment through the door of which objects may be taken from the ocean bed or from which men in diving suits may leave to walk along the bottom or enter the holds and cabins of sunken ships. Vacuum Tube Draws Up Treasure f The access tube is called a “vacuum cleaner” arm for dredging the ocean floor. When the Hussar undertaking is completed, the tube is going to be applied to sunken coal cargoes. Simon Lake says it will be capable of pumping up 300 tons of coal per hour. “By the way,” Simon Lake explained, “there is an incidental story concerning the Hussar which illustrates one of the obstacles in picking up your fortune from the bottom. of the ocean. “I’ve been collecting data about the old ship since 1884, when, as a boy, I sat on the bank of the East River and watched the old side-wheeler Chester go through the motions of reaching the wreck. They sent divers down every time the currents there got tired and slacked off their pushing. “When the story got out a short time ago that I had asked the United States govern- ment for a contract to salvage the Hussar, I got a letter from one of the divers employed by the Chester. 2,000 Ships Sunk Each Year “This diver wrote to ask for a job with me and explained he had superior qualifica- tions since he had not only found the ship but had handled some of the gold on it to make sure it was there. He added that he had not told his employers about it because he wanted to get the contract himself and have the treasure all for his own. “There are,” concluded Mr. Lake, “an average of 2,172 vessels sunk a year in all the waters of the world. Figure out for your- self how much gold is waiting on the floor of the seven seas—lying there untouched.” Although Lake asserts that he has a per- mit to salvage the Hussar from the United States Treasury Department, with an arrange- ment that the government is to receive 10 per cent of the trove and income tax revenue from it, his two rivals were also granted per- mits from the Coast Guard. Minor C. R. Keith, internationally famous sportsman, yachtsman and veteran of scores of enginecring feats in the tropics, has Thank You for Mentioning Modern Mechanix and Inventions for January When Writing to Advertisers

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Seek Sunken Gold Near Broadway sponsored with his funds a second crew searching for the Hussar’s gold. Mr. Keith’s srand-uncle was the founder of the United Fruit Company. While the illustrious Mr. Lake is counting on his salvage submarine for success, the Keith forces are banking their hopes on a new diving suit and one of the most expert divers in the country. He is Roy Hansen, who worked on the raising of the U, S. Submarines S-4 and S-51. He said he particularly wents to find the treasure so that he can take his share and retire from the occupation which killed both his father and his grandfather. Thomas P. Connelly, president of the Em- pire Marine Salvage and Engineering Corpo- ration, explained the special diving suit. Details of Special Diving Suit “This deep-sea diving suit,” he said, “is made of steel and manganese bronze. The arms and legs are flexible, thus allowing a diver not only the use of his arms and claws to work with, but also to walk as well. “It is built of sufficient strength to enable a diver to work in it at a depth of 1,000 feet, or more if necessary. The suit carries its own air supply, and therefore does not require the use of the customary air line. “It weighs 675 pounds and has a massive body and head of steel with glass-covered openings for eyes which are at the ends of short steel protuberances jutting out from the head. The diver takes down with him a bottle of 1,250 pounds of oxygen, which is to be used only in an emergency.” Hansen keeps in touch with the “mother” tug Terminal by telephone. His suit is equipped with three 5,000 watt electric lights, one on each arm and a third on the head, which enable him to see about five feet in the murky waters of Hell Gate. The suit is roomy enough to supply him with air for about an hour. A caustic-soda respirator per- mits him to breathe. this same air over and over again for six hours. The extra oxygen tank is carried in one of the legs. Part of Wreck Believed Found The Terminal drops Hansen over the side with 2,000 feet of cable by which it drags him along against the strong tide. In a week he located six wrecked ships, none of them the Hussar. i The third competing expedition is headed by R. T. Powell, former engineer, inventor and real estate man. He is using a yacht con- verted into a regular salvage ship with ordi- nary aug equipment and expert divers. His chief diver is Anton Schacht. Schacht reported the finding of a piece of timber about 50 feet long and four feet wide, which his as- sociates believed was part of the Hussar. If anyone except Lake recovers the Hussar’s treasure, there’s going to be a merry court fight, as a Judge will then be asked to decide who is rightfully entitled to the gold. Lake claims his rights are superior to those of the Keith and Powell outfits. They are countering that they were on the scene be- fore him. Thank You for Mentioning Modern Mechanix and Inventions for January When Writing to Advertisers ' Thousands seld— \ Never a complaint! 1 @ “Alr Scout” - A. C. model hi m h S s is a wonder- shown here £ ful Christmas gift h opportunity — E POWERFUL! ae Operates direct from any house current, AC or i% DC. Gets all standard broadcast stations, police calls, FOREIGN sta- tions, code and trans-Atlantic phone conversations. Uses 3 plug-in coils, band 10 to 550 meters, Compact, port- able, operates several headphone sets 106 to cover printing | simultaneously. and postage, brings you valuable deta A WAVEreceivara. Alt: at once. Complete with 2 tubes, ear- phone, 2 coils covering “Ajr Scout Midget” Portable band from 70 to 350 me- ters, ready to plug in and use. Battery operated ALL- WAVE “Air Scout’ com- plete with tube, earphone, two coils, data inslructione, assembled, wired, ready to use, NOTHING ELSE TO All-Electric With One 2-in-1 Tube In Metal Case. . Smallest, lightest and sim- blest in the world, but what a PHRFORMER| Size 10xi% by 3% inches. Weight only 3 ` pounds. UsesstandardAIRSCOUT plug-in cots and covers band from 10 to 550 meters. Works from any 110-volt_a. c. or d. c, lighting elr- cult,- Brings in broadcast and short wave stations on short BUY except inex- pensive batteries ... $5.95 Same as above, but in kit form.... $5.00 Ampllfiers for both battery and electric sets . . . write for detalls. $ 0 Post paid Send check, money order, or bills HAMILTON SPECIALTY COMPANY Dept. M.M. 135 Lockwood Ave. New Rochelle, N. Y- Grow our famous Fancy White Queen Mushrooms. Exclusive new process. Bigger, better, quicker crops. More moncy for you! Enormous new de- mand. Illustrated book free. Write today! AMERICAN MUSHROOM STRIES, LTI di VOOM SIN YOUR CELLAR „LTD. 881 Woolnough Bldg., Toronto, On! SHOW CARD LETTERING Here is the very course you need if you seek a position as a Show Card Letterer or Sign Letterer, or want to have a business of your own. Complete and practical and especially arranged to meet the needs of the student who studies at home. Written by E., L. Koller, Principal of the International School of Art, member of the American Federa- tion of Arts, and The National Society of Crafts- men. Mail coupon for Free Booklet. (Coe ee ee INTERNATIONAL SCHOOL OF ART | l Division of the International Correspondence Schools | l Box 2323, Scranton, Penna. | | Without cost or obligation, please send me full details of your home-study course in l l O Show Card Lettering l l D Miustrating D Cartooning | ] | l l

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BUSINESS Welcomes NEEDED GADGETS An adding machine, bookkeeping machine, and typewriter all in one is this new German invention. Telephone-like dial automatically shifts the paper to any desired line on sheet. Left hand of girl rests on adding machine keys. Motor cleaning fluid which is poured into an auto engine through the spark plug openings is said to clean out carbon deposits overnight. Bottle cap with a new measuring cone permits accurate pouring of the correct medicinal dose without using a spoon or dropper. Centrifugal water pump powered by 10 h.p. out- board engine is designed for fire fighting, small irrigating jobs, or even for pumping dirty, sand- laden water. Combination sofa-bed has ash trays and book- shelves built into wide, cushioned arms. Electric turntable for store windows, powered by small electric motor, runs at 4 revolutions a minute, and costs less than 2 cents a day for power. It will support displays weighing up to 10 pounds. Radio test leads with interchangeable points permit use of either needle or blunt point when testing radio apparatus. Grease guns using cartridge refills eliminate messy filling from cans when greasing automo- biles. Factory-loaded 1-Ib. grease cartridge is slipped into gun. Single gun serves for full greasing operation, since cartridges are inter- changeable even when partly empty. GLACE BOLDER Photo at left shows construction of electric hone device designed to sharpen both. edges of razor blade at same time. Motor starts automatically as blade is pushed into device. 146 Short-wave tuning oscillator attachable to any all wave radio receiver gives pleasing tuning signal tone to help find distant stations. Signal tone disappears when the switch is thrown, leav- ing the desired station accurately tuned in.” Electric lighting plants in 300 to 2000 watts ca- pacity provide flickerless 110 volt, 60 cycle cur- rent for lake cottages and farm homes. Gas en- gine, starter, governor, and generator are all combined in one compact unit. New fisherman’s aid permits trolling at any depth without the use of heavy sinkers. Sliding weights on the de- vice reverse the ac- tion of the troller to bring the fish to the surface after a strike. Projector for 16 mm. film throws 15x20 pictures brilliant enough for theater or auditorium use. A 1000-watt light com- bined with a highly effective optical system makes this exceptional performance possible. Attachable to any ladder in few minutes, new ladder leg adjusts automatically to all un- even surfaces, including steps. Steel springs operate equalizer. Vertical spindle wood shaper selling at less than five dollars operates from any motor over 1/10 h.p., and cuts a va- riety of bevels, moldings or grooves. The spindle is readi- ly adjusted on the metal frame for a new cut. Magazine loading razor contains 20 blades; blades are changed instantly when necessary without touching them. The angle of the blade to the handle changes con- stantly with use, to conform to the contours of the face. Toothbrush holder and paste dispenser conveniently attaches to wall. Turn of the handle at right forces the paste out. Cigarette package opener slices out small hole in end of package with one movement of operat- ing lever. Editor’s Note—A mimeograph list of manufacturers’ ad- dresses for these and other new producta in this issue can be obtained by sending a stamped, addressed envelope to MODERN MECHANIX AND INVENTIONS, 529 South 7th St., Minneapolis, Minn. Manufacturers and inventors are in- vited to submit photos and literature for this page.

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fey, PAYS YOU zo $7.00 m HOUR! KAR-NU is a new, miracle discovery—a transparent magic-like fluid with which anyone can refinish any color automobile easily, quickly and economically without z polishing, waxing, rubbing or painting. JUST WIPE IT ON WITH A EFORE | CLOTH! IMMEDIATELY the dullness, the discoloration, the shabbi- USING ness, the sunfade DISAPPEAR. INSTANTLY, as if by magic, the old paint is covered with a tough, elastice coat which is absolutely transparent, self-levelling and self-polishing. .KAR-NU fills up the pores of the old p finish and actually rebuilds it. The paint or Duco is rejuvenated, giv- N ing it the lustre, life, glow and beauty of the original factory finish. As KAR-NU dries it seals the pigment and pro- tects the finish from further wear. Lasts 8 to 12 months. GUARANTEED. NOT a Polish Wax or Paint WOW f LOOK á Lasted 8 to12 Months Fr GUARANTEED USING KAR-NU/ Works Like 3) i MAGIC! KAR-NU is entirely new and dif- ferent—there is nothing in the world just like it. Now, it is no longer necessary to spend long, te- dious, back-straining, muscle-tiring hours polishing, waxing and rubbing to produce a ‘‘mere shine’’ that is only fairly satisfactory. KAR-NU is free from the labor and danger of so-called ‘‘cleaners’’ with acids and abrasives that remove some of the finish each ame fter are ea EAE NU produces a result that is equal in beauty to a repaint or refinishin a Which, costs Soe eater This Seal of Approval $75.00. Stands blazing pes aay ane or ae sunshine and engine mobile ub o! = OTHER USES heat, rain, snow and nois shows that KAR- Rarer below zero tempera- NU is a product of “ 3 Besides refinishing auto- tures, repeated car merit and does all we Se Sa mobiles, KAR-NU has washings. claim for it. C0 A peted o ge meda | Oulik Galos] FREE SAMPLE COUPON store and shop. It refin- Sensational Profits ! i f i store and shop. Tt nein | ncrmous demand! Millions want it! W. L. Morgan, of | KAR-NU CO.. Dept. E-41, machines, h registers, Mass., earned $10.61 in a single hour, Sell to individ- | Cincinnati, Ohio l scales, des chairs, file uals, fleet owners, garages, auto accessory stores, used car RUSH FREE SAMPLE to prove your claims cabinets, iture, book dealers, ete. No experience necessary. Send no money i about KAR-NU, and Territory offer. l cases, safes, ete.—in fact for sample and details. Get in on ground floor, Just anything mae at metal on mail coupon—NOowW. | | which the or gina finish has V; eee eee ee ee Cee eee become dull or discolored, DEALERS—Write For Name Of I Name «++ | Nearest KAR-NU Distributor k E E E EE E | KAR-NU CO., ekdi oie | | Taa EEEN sassai aterioi State...... . =e ma e e ee eee mo m e s ee ee eee oe

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lO ANNOUNCING AMAZING TYPEWRITER BARGAIN PORTABLE £ A DAY MONEY BACK GUARANTEE. | / Lp) FREE TRIAL OFFER EVERY ESSENTIAL FEATURE | found in Standard: Machines Buying a typewriter isn't like representsthe height ofeconomy buying a suit of clothes. Many ..- unequalled economy in first Remington portables, secing 10 cost... unequalled economy in years of hard service are stillin service. active use. When you buy...buy ® Positively the greatest portable typewriter bargain ever offered! Now for the first time Remington, world-famous manufacturer, offers a NEW purchase plan... only 10¢ a day buys this latest model machine! Not a used or rebuilt typewriter. Not an incomplete ma- chine, A beautiful brand new regulation Remington Portable. Stand- a machine with every standard feature. The Remington No. 5 isthe most compact and durable portable ever built...includes all essential standard typewriter -features. This beautiful machine It is today the best value ever offered in typewriter history... and that statement comes from , the company that has constantly made typewriter history. Buy now, It isareal bargain offer. Money making oppor: tunities always oper Hundreds of jobs are waiting for pele who can type, A typewriter elps put your ideas on paper in logical, impressive form, helpsyou write clear, une derstandable sales reports, letters, articles, or stories. Å. Remington Porte able has started many young man and woman on the road to shecess. A Girt for Every Niember ofthe Family Tf you want a gift for birthday, Christmas, or graduation... one that Father, Mother, Sis! Brother will use and ap) tor years to come. ,. give a Rem- ington Portable, It's the one gift that can be used with both pleas- ure and profit by every member of the family. REMINGTON RAND INC., DEPT. 141-1 ard 4-row keyboard; Standard width carriage; margin release on keyboard; back spacer; automatic ribbon reverse; every essential feature found in stand- ard typewriters! ACT...WHILE LOW PRICE HOLDS GOOD! New wage scales in our own factories, and in the factories of the companies which make our ‘materials, point definitely to higher prices. Stocks of machines on hand make possible the present unbelievably low cash price on this machine. Everything points to higher prices. We don’t believe that we can maintain the present big price reduction in the face of constantly rising costs in every one of our departments. So we say “Act fast!” 10 DAY FREE TRIAL OFFER You can try this machine for 10 days without risking one penny of your money. Not even shipping charges. Send for complete details on this most liberal offer. Get attractive new catalogue illustrating and describing the many Remington models available on unusu ally low terms. Clip coupon today! BUFFALO, N. Y. PON NOW N Tit rf tion, Margin release on the keye Specilication See foara. Attomatic ribbon reverse. ‘The Model 5 includes every es: Back spacer. Two color ribbon shift, ($ eature loundin Variable line spacer. Adjustable writers, it has margin stops. Auto set Paragraph board, Complete visibility Key (one of the most useful features width carriage for long envelopes, found on any typewriter), Weight Carriage return leverofexception. T1 lbs, oz. Furnished with Pica al design for easy and rapid operas ar Elite*type. i f TYPING COURSE When you get your new Reme ington No. 5, you will get with it... ABSOLUTELY FREE... a 19-page course in typing. It teaches the Touch System, speeds up work. ït is simply written and well illustrated. Instruce tions are easy as A.B.C. Even a child can undere i stand this method. A little study and the average- 2 i erson, child or grown-up, becomes ‘inated, n es | ‘ollow this course during the 10-D4A FREE ied TRIAL OFFER that we give you on your types, writer. At the end of that time, you should be able to dash off letters faster than with penandink, CARRYING CASE With every Remington No. 5, a FREE carrying case sturdi, ly built of 3-ply wood. Cove ered with heavy DuPont fab- ric. Top is removed in one motion, leaving machine firmly attached to base. Can be used anywhere. -- on knees, in chairs, on traing, FELLLLTELLLETTTTTTITITEELITLI LILIT ATTI a Remington Rand Inc., Dept, 141-1 Buffalo, N. Y. > Please tell me how I can buy a new Remington Portable typewriter for only 10# a day, Also enclose your new catalog. Name. | Address City—— State.

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If you are dissatisfied with your present job—if you are struggling along in a rut with little or no pros- pect of anything better than a skin- ny pay envelope—Clip and Mail the Coupon NOW! Get my big 64-page 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. Feal Opportunities Ahead in Radio for Trained Men It’s hard to find a field with mere opportunities awaiting the trained man. Why in 1933—one of the worst depression years—the Radio industry sold $213,000,000 worth of sets and parts ! Radio set sales INCREASED 45 %—tubesales INCREASED 25% ! Over 300,000 people worked in the industry ! It’s a gigantic business, even in the worst business years. And look what’s ahead! Millions of sets are going out of date annual- ly. 18,000,000 sets are now in operation on which over $200,000,000 are spent EACH YEAR for repairs, servicing, new tubes, ete, Broadeasting stations pay their employees (exclusive of artists) approximately $23,- 000,000 a year. Advertisers pay 600 great Broadeasting Stations over $75,000,000ayear for Radio time and talent. A few hundred jobs that paid $40, $60, $75 a week 20 years ago have grown to thousands. These figures are so big that they’re hard to grasp, Yet they’re all TRUE! Here’s a new- industry that -has-grown to be a commercial giant! No wonder great business leaders predict a brilliant future for the great and grow- ing Radio-industry. Broadcasting Stations Employ managers, engineers, operat tors, installation and maintenance men for dibs, paving up to ‘J. E, Smith Loud 1 Speaker Pres. National Radio Installation and ser- The man pre T directed the Home Study Training oť more men for the Radio industry than any other man in America, Eoria krei Radio men, Set Servicing Spare time set servic- | ing pays many N.R.I. men $5, $10, $15a week | extra, Full time men make as much as $40, $60, 875 a week. | Some of the Many Other Jobs | | N. R. l. Trains Men For Radio Service Business of your own | Spare time Radio Service work | Retail Sales of Radio Sets and Equipment Service Expert for Retail Stores Broadcasting Station Operator Aireraft Radio Operator Ship Radio Operator Loud Speaker Systems, Installation and Service | Auto-Radio Installation and Service | Television Station Operator i f Commercial Radio Station Operator | | Short Wave Transmitter Installation and Maintenance Designing and Building Testing Equipment Service Expert with Radio Factory | All-around Servicing Expert | T’ll show you how to use my special Radio Equip- ment for conducting experiments and building circuits used in such well-known sets as West- inghouse, General Electric, Philco, R. C, A. Victor, Majestic and others. You work out with your own hands many of the things you read in our lesson books, This 50-50 method of train- É ing makes learning at home easy, interest- ing,’ fascinat- ing, intensely practical, You É learn how sets |} work, why they $ work and how f to make them |} work. 8 Thank You for Mentioning Modern Mechanix and Inventions jor January When Writing to Advertisers Get Into “Into This Field ie With a Future There's opportunity for you in Radio. Its -future is certain. Television, short wave, police Radio, automobile Radio, loud -speaker systems, aviation Radio, marine Radio—in every branch develop- ments and improvements are taking place. - Here is a real future for addi- tional thousands of trained men who real- ly know Radio, Get the Training that opens the road to good pay and success ! Send me the Coupon NOW—and get full particulars on how easy and interesting I make learning at home. Read the letters from graduates who are today earning real.money in this fascinating industry. Learn at Home in Your Spare Time To Be a Radio Expert Hold your job. There is no need for you to leavé home. I will train you quickly and inexpensively in yoursparetime. You don’t have to be a high school or college graduate. My Course'is written in a clear, interesting style that most anyone can grasp. I give you practical experience un- der my 50-50 method of Training—one-half from Lesson Books and one-half from practical experience with equipment I give you. This unique and unequalled method has ‘been’ called one of the greatest devel- opments in home study Radio training. Many Make $5, $10, $15 a Week Extra in Spare Time While Learning My big. 64-page book gives proof that many make $5, $10, $15 a week extra servicing sets in theirspare timesoon after enrolling. 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 foritself.” 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 Lesson and Instruction Service upon completing your Course. 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 fulltime job opportunities ; it tells you about my Course ; what others who have takenit are doing and making. Find out what Radio OFFERS YOU—without theslightest obli- gation. MAIL THE COUPON inanenvel- ope, or paste it on apenny postcard NOW. J. E. SMITH, President NATIONAL RADIO INSTITUTE Dept. SAH, Washington, D. C. Clears $4,500 In 18 Months > “Before tana your Rad Course I wae making $18 a week. I came here three years ago, In about 18 months I made about $4,500 in Radio, I cannot say too much for the wonderful help I have received from N. R. 1.”—NOEL W. RAY, 619 Broad St., Gads- den, Alabama. Spare Time Work Ee $18 “I do only spare time Radio work and average $18 a week. People who in good times would buy a new Radio now have the old one fixed.”"—STEPHEN J, DRAPCHATY, 407 Wunder- lich Avenue, Barberton, Ohio. Now Owns Own Business “If I had not taken your Course I would be digging ‘itches instead of run- ning my own business. One week I made $75 on repairing alone, and this doesn’t count sales. If a fellow wants to get into Radio, N. R. I. is the starting point.”’— R. S. LEWIS, Modern Radio Service, Pittsfield, Ohio. J. E. SMITH, President Washington, D. C. National. Radio Institute, Dept. 5AH Dear Mr, Smith: Without obligating me, send your book which points © out the spare time and full time job opportunities in Radio and your 50-50 i method of training men at home in spare time to become Radio Experts. q (Please print plainly) a NAMES 2... ccc e ccc ee cence een ensceneneenaseseosease, AGE.... es a a Thank You for Mentioning Modern Mechanix and Inventions for January When Writing to Advertisers

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OTHER MEN Have Read and Profited by this MANY LITTLE IDEAS HAVE BIG COMMERCIAL POSSIBILITIES The Paper Clip Often some simple, little article will prove to be a big commercial success. Take an ordinary paper clip; just a piece of twist- ed wire, yet they are sold by the millions every year. Wooden Golf Tee Another little article now used by thousands is the wooden golf tee. For years golfers made ZA their tees with clay or wet sand. Then a man had a hunch to make a tee of wood. The idea was worth a fortune. Metal Bottle Cap Here’s the ordinary metal bottle cap, used on beer and soft drink bottles. Its inventor, William Painter of ~ Baltimore, built a big business and became wealthy with this simple idea. Hair Pin One day a husband noticed his wife bend her hair pins to make them stay put. That gave him the idea for hair pins with kinks, He patented the idea and is said to have reaped tremendous profits. Shipping Tag Before Dennison in- vented a shipping tag with a reinforced cyc- let, tags gave much trouble because they pulled off the strings intended to hold them in place. Yet see how simple Dennison’s idea was. This is another little article which be- came the basis for a very large business. HIS book was prepared for men of ideas— men who have an article in mind that will make money, save mon- ey, save Jabor or give pleasure. Leading thinkers agree that the op- portunity for the inventor is as great today as ever before—that the world of a few years from now will be radically different from the world of today because of the contributions to progress that inventors will make. Now is the time—if you have an invention to see about fully protecting it so that you can be sure of your just share of whatever profits it may make. C. F. KETTERING Vice Pres., General Motors Says This About Invention In statement in Good House- keeping Magazine, Charles F. Kettering, who helped develop the self-starter, Duco, and other important inventions, said: “Our return to normal times de- pends on new manufactured products that will catch the pur- chaser’s eye, get him to buy and start the ball rolling. Change and buying go together. We're only entering the great period of inventive advancement.” Improvements Can Be Patented Don’t think that to be profitable an idea needs to be complicated. Simple articles—like those shown here at the left—have often proved profitable. Also improvements on patented arti- cles sometimes are more valu- able than the original article it- self. If you have an invention —at least see what its possibili- ties may be and HOW YOU CAN PROTECT YOUR OWN RIGHT TO IT. Don’t Delay—Send for this Free Book Now Many a man has waited until too late to protect an invention. by means of a United States Patent. Remember that someone else may be thinking along the same lines that you are; and the Patent Laws place the burden of PROOF on the man who files his Patent Applica- tion last. You may have much to gain—and nothing to lose—by act- ing promptly, Learn the important facts about Patent Protection at once. 36 Years of Proven Service For thirty-six years this organi- zation of Registered Patent Attor- neys has served inventors from all over the country—all over the world in fact. What you write us Is held In strict confidence. We have a large staff of patent spe- cialists to give you expert and prompt service. Yet because ofa highly efficient organization, our fees are low; and we also help you with deferred payments. The cou- pon makes it convenient for you to communicate with us at once, Use it today. 12 Thank You for Mentioning Modern Mechanix and Inventions for January When Writing to Advertisers IMPORTANT With this interesting book, you will also find an “Evidence of In- vention” form, which makes it easy for you to sketch and describe your idea as a‘matter of record, This is an important step if you haven’t taken it al- ready. The book will tell you how to use this | record and why. It also ‘comes to you without ` any charge or obliga- tion. VICTOR J. EVANS & CO., MAIN OFFICE: 520-A, VICTOR BUILDING, WASHINGTON, D. C. This Book TELLS YOU: How tho Patent Laws protect you and why, if you have an invention, you need a Patent at all. What to do to make application for a Patent; just what information a Patent Attorney needs to help you. hg What kind of a sketch or model is needed, What simple steps you may be able to take right away to help claim: your right to your invention, even before you make application for a Pate: How some successful inventors have secured fin: cial assistance to help them in the developm of their inventions. Tells you about interesting inventions that have proved successful and illustrates important me- chanical principles that inventors frequently use in working out problems. PATENT PROTECTION is much more than a book about patent procedure. In it we have put the Kind of information that we know from long ex- perience the average man with an invention would like to have. The very same day we hear from you—a free copy of Patent Protection will be placed in the mail to you. Sigi and send the coupon. Get that much done today. State.. rite or Print Name Carefully) Other Offices: 1640-B Conway Bldg., Chicago; 1007-B Woolworth Bidg., New York; 514-B Empire Bidg., Pittsburgh; 1010-B Hobart Bidg., San Francisco; 736-B Security Bldg., Los Angeles. I am interested in your book, PATENT PROTECTION, and your Evidence of Invention form. Please send both of them FREE and without obligation on my part. Thank You for Mentioning Modern Mechanix and Inventions for January When Writing to Advertisers 13

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: Mark Chapman built the trailer in two upper photos from MM’s Wanderer plans and PRIZE WINNERS ron first prize of $5.00 this month. Photo of ice boat in circle brought second prize, $3.00, to Ed Shealy. Carl Rasmuson made the motorized bike with a washing machine motor and won third prize, $2.00. HEN you have a spare dollar or so, do you go down to the second hand shop, select an old piece of furniture, and then take it home to rebuild it into something so unusual that every visitor praises it? Or do you get some lumber, seclude your- self for hours or days in your workshop and come out finally with neatly finished furni- ture of your own design? If you enjoy doing these things, you will find a big contest offering 14 prizes totaling $125 in cash just suited for you in this issue. Turn to page 44. The contest is the second in a series of four offering $500 in cash prizes to MM readers. If you missed the first contest in the December, 1934, issue send 15 cents for scopy to Modern Mechanix Publishing Co., 529 S. Seventh St., Minneapolis, Minn. * + * A reader turns to MM for help to find someone with a seaplane who would be willing'to go into partnership on a venture seeking a fortune in gold in Canadian wilds. Here’s ‘his story: 56 St. Clair Ave., W. Apt. 5. Dear Editor: Toronto, Ont. °Tis with despair that I turn to ye! There 18 seems to be no one owning seaplanes around here with gambling spirit or gumption enough to go off on a prospecting venture up to the Long Sac area in northern Ontario, now a booming gold area. What I am after is a partner with a sea- plane. I have had some very valuable ex- perience in the field as well as my studies and laboratory work in mining engineering at school. It will not be necessary to fly with heavy loads as a base camp may be erected twenty miles from the transcontinental railway and most of the stuff may be sent via rail. I would like to state that I have the com- plete outfit necessary for a successful pros- pecting venture for two. I would also like to say that I have been successful in staking and selling gold claims in the vicinity of Sudbury. Harry C, Easton. If you want adventure and have a sea- plane, get in touch with Easton. And when you makc your gold strike, save a little nug- get for a camera and take a photo of your outfit for the Editor’s Workbench. kd * kod While space permits, we’ll give you the winning letters and photos in this month’s Modern Mechanix and Random Chips from the Editors Workbench 7 Want to go prospecting for gold in Canadian wilds? An MM reader is seek- ing a partner with a seaplane. And hete’s another contest in $500 cash prize series. Workbench contest. First prize of $5.00 goes to M..H. Chapman for the photos of his automobile trailer. His letter says: 7 i Baldwinsville, N. Y. Dear Editor: Enclosed are snapshots of the trailer I built and used this summer. I used for my model the “Wanderer” published in the December, 1933, issue of Modern Mechanix and Inven- tions. It is built on a Chev. 1929 front axle. It has sides of 1⁄4” masonite, top of canvas painted aluminum, and is nine feet three inches long, six feet wide and six feet high. ‘ang coe Not having ac- cess to a welding outfit I used oak throughout. The windows are street car windows pur- chased from an abandoned line. I used the tire of an old lumber wagon wheel for the wheel Tilit : ick housing. is is the one-t t wave > mode! described in the Octo- The trailer ber, 1934, MM. G. D. Aydlet, weighs 1460 Ibs. of Norfolk, Virginia, built it. with all the equip- ment. It can sleep four persons and has traveled over the highway better than 50 miles per hour. M. H. Chapman. If you want to build as useful a trailer, for 50 cents you can get a copy of the 1935 edition of the.Handy Man’s Home Manual which includes drawings and_all instruc- tions for “Wanderer.” Enlarged blueprints can be obtained for $1.00. Send your orders to MM. Second. prize of $3.00 was awarded to Edward M. Shealy. This is what he says about the ice boat shown in the photo: Madison, Wis, Dear Editor: Enclosed find picture of my ice boat which I built in my spare time in 9 days last winter. It was easy to build and the total cost includ- ing the sail was only $14.50. She carries 150 feet of sail and is lateen rigged. The sail is Inventions, January, 1935 Two fine locomotive models built by U. B. Graff. Top photo shows Pacific type and lower first Southern Pacific loco- motive, Both are built to scale one-fourth inch to the foot. an equilateral triangle 18’ on each side and is suspended from a mast by means of a hook. The boat does 50 to 60 m.p.h. j Edward M. Shealy. kcd kai kol Carl Rasmuson wanted a motorized bicycle and solved the problem easily and at low cost. His photos and letter brought him third prize of $2.00. After assuring us that MM “is the best mag. on the market,” he says: Rockwell City, Ia. Dear Editor: I am enclosing two snapshots of a Maytag motor arrangement for a bike. It has friction drive on the rear tire through an old Maxwell fan pulley and a piston for an extended belt pulley. The clutch is held in with a spring. It is started by merely releasing the clutch lever when a little speed is obtained with the pedals. At first the speed was slow but I increased the size of the motor pulley and then got about 18 m.p.h. If anyone is inter- ested I can send details. Carl Rasmuson. (Continued on page 20) This ice sted, built by John Ceraska, can do 75 tm.p.h, on ice. It has a home-made prop and a motorcycle engine. 19

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PACKARDS PRESIDENT In this vital, human story, Alvan Macauley, Packard’s president, has an inspiring message for every boy and workshop fan in America. HEN I was asked to tell readers of Mop- ERN MECHANIX AND INVENTIONS some- thing about the home workshop in which I have spent so many pleasant hours, I at first refused. I could see no particular good in discussing my own personal addiction to a hobby which is so widespread among the men of America, young and old—the hobby of building things with tools. After some consideration, however, it ap- peared that I might well change my mind, for two reasons. First, because I believe I have learned one lesson in my workshop which I would like to pass on, particularly to younger readers; and secondly, because (as my young grandsons have often pointed out to me) my workshop is probably just the sort of place every boy dreams about. Possession of it seems to entail some respon- sibility toward others of the plane-and- chisel fraternity. I suppose anyone who possesses something dear to the desires of millions of boys ought to be willing to talk about it. Therefore, much as I dislike to talk about myself, I resolved to do so for once on the theory that in this case the end might justi- fy the means. I have possessed tools of some sort ever since I was old enough to appreciate them. I think I spent the first half-dollar I ever earned for an oil-stone to sharpen my chisels and plane-blades. From the first my liking for tools took a bent toward wood- working, principally because wood is the 32 by ALVAN MACAULEY President of Packard Motors As told to PAUL WEBER n Many of the refinements which grace Packard interiors, such as the carved paneling shown above, were inspired by ideas born from Alvan Macauley’s home workshop hobbies. easiest material for the amateur artisan to work and because it gives excellent results with a minimum of equipment. My early activities in that line naturally inclined my mind toward the drawing- board, and for some time while studying Jaw at George Washington university I was employed part time in a draughtsman’s office in Baltimore. At the same time, be- cause of my youthful love of the saw and chisel, I became interested in the study of woodworking as an art. The subject has held my attention ever since and a consid- erable section of my library is devoted to works dealing with the history of fine furni- Modern Mechanix and fel% How Workshop Hobbies win Success/ HIS FIRST SO CENTS Mr. Macauley has loved tools alt his life. | P His first half-dollar was spent for an oib ` | Pe stone to keep chisels, plane-blades sharp. ture and the technique of the craft. When I built my present home on the shore of Lake St. Clair in Grosse Pointe, Michigan, I provided plenty of space in the basement to accommodate my work benches and tools. The shop now contains lathes, vises, band-saws, planes, drills, chisels, etc., enough to handle almost any kind of wood- working job I would care to attempt. During recent years, the pressure of affairs has prevented me from spending a great deal of time at my bench and lathes. But I can look back upon—and forward to, I hope—many happy hours spent in the shop. One of my greatest pleasures has been to build things for my eight grandchildren, two of whom are boys, just at the tool-lov- ing ages of seven and ten. For the children I have built high-chairs, cribs, small chairs, Inventions, January, 1935 In the photo and drawing above is shown a section of the home workshop in which Mr. Macauley builds cribs, highchairs and toys for his grandchildren, and beautifully carved pieces of period-design furniture as gifts for friends. and numerous toys, including an armada of toy boats. My other workshop projects have been chiefly pieces of carved furniture which I tried to make true to some period design. These were usually given away to friends —who, of course, had to be very much ` pleased. Quite frequently, business and pleasure find a common ground in my workshop. Many of the ideas I have contributed to the interior finishing of Packard automobiles— especially custom body jobs—have had their inception while I was chiseling away at some project in my basement. Every boy who shows a love of working 33

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Capt. C. W. A. Scott (right) and T. Campbell Black, race winners, are shown above. Right—Details of their special D. H. Comet racer. SHARPLY TAPERED WINGS COVERED WITH 2 LAYERS OF NARROW-BOAROS LAID DIAGONALLY AND CROSS- WISE WITH FABRIC COVER WOOD SKIN‘OF TO SATIN-LIKE SURFACE SPACE FOR EXTRA GAS TANKS I WING ue greatest race in the history of avia- tion, 11,358 miles from London to Mel- bourne, was won by an English ship, but proved that the United States is supreme in the air. By flying the distance, half way ’round the world, in 70 hours, 54 minutes, 18 sec- onds, the English plane, specially built for the race, won the $50,000 cash first prize in the speed race and $2,500 gold cup of- fered by Sir MacPherson Robertson, Aus- tralian candy manufacturer. The astound- ing time, less than three days, cut by more than half the record of 6 days, 17 hours, 56 minutes established in 1933 by Charles J. P. Ulm. This great speed, averaging 176 miles per MASS BALANCE FOR RUDDER by JAMES DYSON American transport ships eclipse speed victory of British racer in dash half way ’round the world. Radio movies and other technical sidelights revealed here. 44 Fr, PILOT'S —_ COMPT’MT, 2 120 GAL. FUEL SAN: TANK MIDSHIP a A FILLERCAP pa VENT PIPE S100 GAL. FORWARD j FUEL TANK SHOCK STRUT? Vi FAIRING SEALS WHEEL IN RETRACTED POSITION STARBOARD MOTOR HANGER: hour in flying time, was eclipsed, however, by the feats of two American ships which arrived in second and third positions in Melbourne. Both were standard commer- cial airliners, similar to those used on the regular transport lines in the United States. The British ship, on the other hand, was planned and built for the race. It had not seen commercial ser- vice. It was in effect a flying gas Black and Scott are shown in their Comet racer just before the takeoff in the race that broke all distance air speed records. Note two streamlined nacelles for small 225 horsepower special motors. g 38 Modern Mechanix and tank intended for racing. Eventually it probably will be put into commercial ser- vice, but before that can be accomplished it will have to be modified to provide room for passengers and cargo. Of the two American ships in the prize money the outstanding performance was accomplished by a standard Douglas DC 2 airliner flown by the Dutch team of K. D. Parmentier and J. J. Moll. It was the second ship to reach Melbourne, its handicap time being 3 days, 4 hours, 38 min. It outshone the winning D. H. Comet, by flying approxi- mately 1,000 more miles by stopping at every checking point on the route and by Inventions, January, 1935 F S o MILES- 580.0009 75 ONS enon CONTROL POINTS (ALL CONTESTANTS) CHECKING POINTS (HANDICAP ONLY) Above—Map showing routes of handicap and speed fliers and time that would be required for winning plane to reach planets and the moon. Left—J. J. Moll (left) and K. D. Parmentier, Dutch fliers, who turned in the out- standing performance of the race with a stock Douglas. carrying six persons, to the British plane’s two, a cargo of mail, baggage, and food for passengers and crew. The second American ship to press the British racer was a Boeing 247D transport plane flown-by the noted fliers, Capt. Roscoe Turner and Clyde Pangborn. They landed in Melbourne just three hours after the Dutch team. Their total time from London to the Australian city was 3 days, 20 hours, 55 minutes. The greatest scientific sidelight of the race was the transmission by radio of news- 39

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WinCASH focFurituce IDEAS i5000 Contest At right is a battered old fashioned chair that was con- verted into the modern occasional chair shown in circle on next page. Photo above shows upholstering being tacked in place on arm of chair. Seat is ready for cotton batting. Do you enjoy rebuilding second hand furniture or do you prefer to work out your own designs for tables, chairs, floor lamps and other articles for the home? In either case you have a chance to win one of 14 prizes totaling $125.00 in this contest, the second of four offering $500.00 in cash. This month the prizes are offered for the best ideas from readers on rebuilding or designing furniture. Many of you have converted old radio cabinets into beauti- ful chests, second hand rocking chairs into porch swings, and old-fashioned furni- ture into more modern pieces. Others have designed furniture along modernistic, colonial, mission or other period lines. To enter this contest all you have to do is tell as briefly as possible how to build or rebuild any article of furniture for the home. Read the rules and list of prizes on the next page and then send in your entry. The following article will show you one way to prepare your entry. by J. JULIUS FANTA E-UPHOLSTERING a set of old furniture has various distinct advantages one should not pass up when making household changes this winter. If you are tired of your present set, you can acquire at low cost a suite of castaway chairs. Under the dust- covered, shredded pieces of grandmother’s day are just the “makings” of a set now in vogue. Should your present set be on its last 44 - yards of the same material. Here’s your chance to win one of 56 ptizes, totaling $500.00 in cash. This is the second of four big contests for home improvements for MM readers. TUCK A HALE-HITCH WHEREVER CORD > CROSSES SPRING AND. CORD: All old upholstering is removed. : The tops of the springs are spaced evenly and held in place with cord as shown. Jegs, look for one that’s still solid in struc- ture, with sound joints. The condition of the upholstering does not matter since we must re-upholster to bring the chairs up to date. In buying material figure about 2% yards of 54” tapestry for two small chairs. For a two-person settee you'll need three Three yards of 4” webbing are required to support the springs of a small chair. Larger pieces should be measured for the exact amount, SEE FEBRUARY M-M Modern.Mechanix and HORSE HAIR MATTRESS SECTION SHOWING THE PADDING ARRANGEMENT. . Cross section. above shows layers of ma- terial needed, Right —Fasten springs to form slight crown. allowing 1%” between each strip. To freshen up the old job, light canvas, cot- ton batting and burlap should be included on the shopping list. A half-dollar will cover the cost of a mag- netized hammer, a 3” curved upholstery needle, tacks and upholstery twine. Much time can be saved by using a magnetized hammer to set the tacks in close quarters. Begin by removing the tumble-down up- holstery with a screw-driver. Clear the chair right down to the “bone.” Make sure FOR THIRD CONTEST Inventions, January, 1935 Pull webbing taut with 8 in, board padded at one end and sharpened nails at other. Put padded end against chait, catch webbing on nails, with leverage action draw taut. that you have lifted out all the old tacks embedded in the tack panel. The old tapes- try, padding, etc., should not be immediate- ly destroyed but preserved to insure accu- racy in measuring all new parts. There will be future use for most of them. The webbing which serves as the founda- tion for the springs is basket-woven across (Continued on page 129) RULES FOR SECOND CONTEST Suggestions for building or rebuilding any article f of furniture used in the home can be entered in this contest. Readers can submit as many entries as they wish. Entries may be submitted in all four contests and prizes won in all four. Furniture ideas must not call for professional ser- vices. All work must be within the scope of the average home workshop man. Each entry must include a written description of 1,000 words or less, giving detailed instructions on building or rebuilding one article of furniture, Rough sketches to illustrate the design or work involved should be included. Photographs are not required. Do_not submit actual articles of furniture. Fourteen prizes will be awarded for the best and most practical ideas as follows: first prize $60.00; second prize $20.00; third prize $8.00; five fourth prizes at $5.00 each; six fifth prizes at $2.00 each; total $125.00. ; Modern Mechanix and Inventions reserves the right to publish any entry winning a prize without further compensation to contestant. z Each contestant agrees to permit Modern Mechanix and Inventions to publish all or part of any entry not winning a prize. Entries so used will be paid for at regular rates for the amount of material published. No entries will be returned. Address entries to Furniture Contest, Modern Me- chanix and Inventions, 529 S, Seventh St, Min- neapolis, Minn. All entries must reach this office before midnight, January 22, 1935. Winners will be announced in the April, 1935, issue of Modern Me- chanix and Inventions. The third contest in this series will be announced in the February issue. The first contest was announced in the January issue.

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| Photo above shows last station on the gold trail — the sacked concentrate ready for the smel- ter. Left, wheeling the gold concentrate to the huge bak- ing oven for drying. IG WEALTH in by JAMES NEVIN MILLER NLY a few miles from Rapidan Camp, Virginia, where President Hoover once maintained his summer White House, a vein of gold is being worked that promises to develop into one of the richest ever discov- ered in the East or South. The nation’s newest gold diggings center in the Melville and Vaucluse mines near Wilderness, about 20 miles southwest of Fredericksburg—the heart of the historic region where some 30,000 Confederate and Federal troops perished in the bloody battle of the Wilderness. Although activities in the district are new, the mines themselves are not recent discov- eries. Worked in the days prior to the Cali- fornia gold rush, the mines were later abandoned as the nation’s gold seekers turned to more heavily paying fields. Then the government stepped in recently and set anew value on the precious metal—official- ly pegged the price of gold at $35 an ounce Virginia's New —and the wheels of the mining industry again began to hum in the Virginia hills. Today the workers in the Wilderness mines have sunk shafts 220 feet below the surface and are mining quantities of ore which assays around $5 to the ton. And even more important is the fact that dis- covery of pay dirt in the abandoned Vir- ginia diggings may create a new American gold field. Federal mining specialists have been fired with enthusiasm over returns from the Wilderness mines. As a result, they are planning a thorough probe of the Appa- lachians, once regarded as the righest gold region in the United States, for other new or abandoned mines. Most of the 75 men working the Wilder- ness mines today are rank novices, farmer boys in fact. But thus far they have shown themSelves to be adept pupils in learning the necessary semi-technical facts about blasts, ore faces, mucking and drifts. Supervising their work is an extremely able mining engineer, C. Hyde Lewis, who’s Equipped with ham- mer and pneumatic drills, miners are wresting quantities of paying ore from the abandoned mines recently. re- opened in Virginia, Above, exterior view of Melville mine. Ore is elevat- ed in cars to second story and then chut- ed to another build- ing for_initial re- fining. Left, group of miners starting their 220 foot drop down the mine shaft. ~ AJl photos taken exclusively for MODERN MECHANIX AND INVENTIONS by Lindquist, Washington, D. C. also vice-president of the Rapidan Gold Cor- poration which owns and operates the mines. While the RGC is the only company actu- ally mining in the immediate region, quite a number of other companies are buying up much of the nearby land for the purpose of sinking exploration shafts. Among these is a prominent Pittsburgh outfit, while a handful of wealthy Canadian engineers are Into the revolving masticator shown above, the ore is placed and broken down preparatory to the “flotation” process described in the text. At right, one of the tiny ore cars, deep in the mine. Thus far, about 1600 tunnels have been laid along the gold vein. FOLLOWING THE TRAIL OF PRECIOUS METAL IN THE NATION’S NEWEST GOLD DIGGINGS REECE OSE OS IN LT LETC NIST ATER IETS ETI TET RT LEADED n a 48 Modern Mechanix and Inventions, January, 1935 7 49 continually browsing about. (Continued on page 119) The ore is estimated to assay approxi- mately $5.00 a ton.

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“Previewing AMERICA’S 1935 AUTOMOBILES by GLENN JENKINS ANY new and important improvements Mi have been built into the new 1935 auto- mobile models. Greatest strides have been made in engineering, rather than design, al- though the latest cars show a decided con- tinuation of the streamline idea, emphasiz- ing refinement of the so-called flowing lines which startled motordom last year. Engineers, through discovery and inven- tion, have been able to add from 25,000 to 50,000 miles to the life of the average car. As a matter of fact, more real engineering is now going into the light car than ever, because the competition there is keener and every manufacturer is straining himself to give the most for the money. Greatest interest this year centers around the Chrysler group, which includes Plym- White intreduces a truck engine with. horizontally op- posed cylinders, which can be pulled out on a dolly. Streamlines continue to hold the spot- light. Chrysler’s “bull nose” hood is said to be out, and the “hound’s nose” is in. Beaver-tails are bigger and broad- er, anticipating the rear-mounted en- gine. Here is the latest advance informa- tion on America’s 1935 automobile— how it is built and what it will look like. outh, Dodge, DeSoto and Chrysler models. The airflow lines, when they are seen for the first time at the New York Show, will have undergone refinement. Chrysler en- gineers have made it known that the airflow trend is scientifically correct and they will continue in that direction. Therefore, changes, according to advance information, will be in refinement of the front end to do away with the “bull nose.” The car of the future, according to Chrysler designers, will have a nose like that of a hound, out- stretched and going places in a hurry. The tendency is to design lines and contours that will give the impression of speed even though a car may be standing still. The most pronounced development of the year is the treatment of the rear ends of many models. The beaver tail is more affected and refined. The reason for this, as explained by one leading designer, is to get the public accustomed to this style, be- cause the beaver-tail lines are necessary to house the engine in the event that it is moved from under the hood to the rear axle. Henry M. Crane, technical assistant to the president of General Motors, gives an inti- Chevrolet broadens its line with a new four-door, five-passenger sedan, said to set a new price low in the six and eight cylinder field. Extra leg room for rear seat passengers is provided in the new models by recessing back of front seat. 52 Modern Mechanix and Chrysler engineers have definitely adopted the airflow principles, but advance information indicates that the "buli nose” is doomed and will be superseded by the “hound’s nose” design similar to that illustrated in the photo above. mation of the attitude of GM by declaring that only gradual changes in car design are being undertaken. General Motors points to Cadillac and LaSalle design as its ideal of streamlining, and is expected to follow this trend. Mr. Crane declares that improvement in brakes have not kept pace with speed in- crease, and much must be done to effect needed changes, though radical departures seem to him as unlikely. Wider use of cast iron drums is anticipated and much needs to be done to assure uniformity of brake action under varying weather conditions. Packard engineers have solved the prob- lem of designing louvres in keeping with the streamline trend by locating them under the front fenders. Heat from the motor passes through these louvres, travels along the un- der side of the fender and away from the body, excluding motor heat from the car’s interior. The new treatment affords design- ers more freedom in handling the orna- mental space formerly occupied by the louvres. Another new Packard feature is a model seating nine passengers—three on the back seat, three on the folding seats and three in front. Persistent rumors also indi- cate that Packard will produce a light car destined to offer competition in the medi- uni-priced field. Hupmobile’s most startling announce- ment for 1935 is the inclusion in its line of a 5-passenger, 4-door sedan which lists at less than $700. The new model develops 91 h.p. and has a 117 inch wheelbase. Power. brakes are a feature of all models in the 1935 Hup line. One of the most unique developments for 1935 is the “pancake” truck engine an- nounced by the White Motor Company, a (Continued on page 128) Left—How Packard engineers solved the problem of designing louvres in keeping with streamline trends by placing them under the front fender, Note that louvre space is ornamentally treated in the new Packard shown at the right. Inventions, January, 1935 53

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ANALYZING HOCKEY- GASTEST Game on Earth Voss, of New York Rangers, outwits Toronto Maple Leaf defense to score a brilliant goal. Note cage construction. Human speed reaches its athletic peak in the fastest game on earth—hockey. No other sport even remotely approaches it in tempo. For hockey is a game of human meteors on bladed lightning—a dazzling spectacle of split-second thrills, almost too fast for ordinary eyes to follow. Any hockey spectator knows that the object of the game is to put the puck into the enemy’s goal. How and why it gets there is generally a mystery to the un- initiated. With this in mind, we shall go behind the scenes and see just what it is that makes the game click. Hockey, of course, is played by six-man HIGH TRIP WITH STICK BLUE LINE 2 Pey Drawing shows general layout of hockey rink with positions of players at the face-off which begins each period. The insert of the skating figures shows three common fouls which cause removal from game for a given time. 56 Modern Mechanix and by JOHN C. HOFFMAN teams on sheets of ice commonly known as rinks. When games are played indoors— the general custom in the United States—the - measurements of the rink may be regulated by the size of the building; but in general the playing surface is 200 feet long and 85 feet wide. A wooden fence, 4% feet high and preferably white in color, surrounds the arena. The goals are located from 10 to 15 feet from the ends of the rink and in the center of a line drawn across the ice. The goal posts are set 6 feet apart with a red line— the official goal line—connecting them. Back of the goal line, of course, is a netted cage to catch the puck. The ice area between the two goals is divided into three sections by a blue strip extending across the rink, 60 feet out from the goal lines. The center section is known as the neutral zone and the end zones are variously known as “defensive” or “attacking” zones. The six men who comprise the team are known as goalie, cen- ter, left and right wings and (Continued on page 137) Note that goalie (with uplifted stick) has left cage in this thrilling skirmish, to check the enemy's scoring drive. Right defense passes to right wing who skates across zone line and passes to center. Latter skates toward goal, suddenly passes to the left wing who has entered the end zone with puck move- ment—a typical pass play. Charlie Gardiner, late goalie of the Chicago Blackhawks, has just checked a vicious enemy drive, Arrow points to puck as it struck Gardiner’s body. Note heavy trappings necessary for protection against the mile-a-minute pucks. Inventions, January, 1935 57

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Building World's Largest = Photo shows one of four units which will pump 90,000,000 cu. yds. of earth into Fort Peck dam. Three other dredges ate under construction, upper left. Smaller pontoons sup- port 154,000 volt power line from Great Falls, Montana. T a point in eastern Montana where crowding bluffs force the winding Mis- souri river through a natural bottleneck, army engineers are engaged in one of the most gigantic projects of modern times—the building of the Fort Peck Dam, largest earth fill barrier in the world. Not even Boulder Dam, Titan of the South- west, eclipses the Fort Peck structure for sheer magnitude. For when the massive earthen wall is completed, the rampaging Missouri will be held in check by a mighty barrier almost four miles long. From a sturdy base measuring 2677 feet from upstream to downstream toe, the twin slopes of the dam proper will rise 231 feet above the river bed to form the dam’s crest, 100 feet wide. Across the main channel, en- gineers are throwing a main fill 8500 feet wide, to join a low dam, or dike which will march 11,000 feet up the west bank, for a total length of 19,500 feet. The most unusual feature of the $72,- 60 Four years hence this bridge will disappear as dam rises, filled by earth from a battery of 28-inch pipes as shown above. Map insert shows location of the marnmoth project. 000,000 project is the choice of construction material. A 3-foot facing of concrete and rip-rap will protect the upstream slope, but the main body of the dam will be composed of earth fill—90,000,000 cubic yards of it, which will be pumped into position by a battery of dredges. Held in check by this mighty wall of earth and stone will be a giant reservoir, 175 miles long and 16 miles wide. This huge lake will flood a district of about 380 square miles—250,000 acres—to a maxi- mum depth of 230 feet. Boasting a shoreline of about 2500 miles, the Fort Peck reservoir will impound the staggering total of 20,- 000,000 acre feet of water, an amount which (Continued on page 140) Modern Mechinix and Some idea of the amount of water impounded by the dam is shown in the sketch above. pee : CROSS-SECTION OF DIVERSION TUNNEL GROUT-6 IN. CONCRETE 211N. This cutaway view shows construction fea- tures of dam. Note that water is routed around the dam through four huge diversion tunnels. rialto Fort. Peck dam site. 9,000;000- tons of mate- Railroad will transport $95 FT. Va IN. FOTAL MATERIAL USED WILD (10 WASH AONUMENTS Inventions, January, 1935 61

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eeking SUNKEN GOLD by ALFRED ALBELLI Not on the Spanish Main, but only a short distance from New York’s Times Square three rival gangs are hunting for $5,000,000 in gold. Sunk during the Revolutionary War, the British frigate “Hussar” is the ob- ject of this treasure hunt in the East River. Here is the unusual submarine salvage ship “Laksco,” invented and designed by Simon Lake primarily for salvaging cargoes from sunken vessels. With it he hopes to find the $5,000,000 gold treasure lying on East River's bottom. THREE rival salvage gangs—modern treas- ure-hunters—are now engaged in a nip- and-tuck race to locate the sunken hulk of the British frigate Hussar which went to the bottom of the East River, Manhattan, with a $5,000,000 gold cargo on Nov. 23, 1780. This sensational treasure hunt is raging in a section which is only a five-cent sub- way fare from Broadway—and not on the Spanish Main where quests for sunken gold have held the glamor in past exploits. The Hussar reposes beneath the turbulent waters of Hell Gate in the East River. Hell Gate is the nickname given for this section of the water-way because of its perilous currents and treacherous whirlpools. Each year it claims a toll of at least 15 vessels. Some of the worst catastrophes in Manhat- tan’s maritime history have occurred in Hell Gate. The Hussar went down with 107 men on board. There were no survivors. The vast amount of gold coin was intended for the British army forces quartered near New York during the American Revolution. 64 In September, 1780, according to records in musty archives, the Hussar anchored alongside the H.M.S. Mercury off the Bronx shore. The Mercury had also been sent to pay off the British soldiers. As the Hussar was considered a more rugged craft, better qualified to weather the terrors of Hell Gate, as well as any traps set by the Colonial rebels, the Mercury transferred her treasure chests to the Hussar. In passing Point Morris, the Hussar struck the protruding Pot Rock, tore a huge hole in her bottom and started to fill rapidly. Instantly, the captain steered for shore. In the absence of beaching places, the skipper sent a line ashore by small boat. The line was firmly fastened to a tree at one end and to the sinking Hussar at the other. It was the captain’s plan to keep the Hussar floating in comparatively shallow water until the money could be taken ashore. But the rope snapped and the ship went down. It so happens that on this side of the river there is a shelf which runs along under the water, hewn out of the Modern Mechanix and 15 Minutes from “Broadway SALVAGE SUBMARINE: 22 FT.LONG Left—How Lake’s salvage operates when seek- ing sunken wrecks. submarine island by nature. This bar drops suddenly from 17 to 80 feet. Some of the navigators who have been trying to locate the Hussar believe that she went over this ledge and was dragged down- stream by the heavy tide currents, and then slid over another cliff and'went down to the bottom. Although the records have placed the Hussar’s hulk near Randall’s Island, be- tween 130th and 131st Streets, divers have not been able to find her. They have come 1935 Inventions, January, Roy Hansen, noted diver, is. shown ‘being lowered into East River to continue search for the “Hussar”. His div- ing suit was designed for the treasure hunt. Map at left shows where the “Hussar” was wrecked. The hulk of the gold laden ship is believed to be off Randall Island. upon several other wrecks, however, but these derelicts carried trade cargoes of coal and minerals—not gold. The Hussar has been worked for treasure ever since 1818. The crude and primitive diving equipment of those days prevented effective work in the surging tides of the roaring East River in the Hell Gate section. In 1819, the records of the present treasurc- hunters further disclose, some of her guns and upper sheathing were brought up. These were retrieved, the records state, in a nest 30 feet below the bed of the river. There have been many attempts to sal- vage the Hussar in the past twenty years. This past summer, however, three expedi- tions got going. with a do-or-die determina- tion, and before the passage of another sum- (€ontinued on page 144) 65

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Modern Mechanix and Inventions Exclusive Photo The thrilling sound of sword or saber duels is simply the clash of knife and fork. Note idle rapiers of the players while the soundman at rear near the mike holds knife and fork ready. by W. L. COLLINS OW did the broadcasters ever teach a tree toad to emit its mournful cry—on cue—for that outdoor program you tuned in on last night? More than likely the tree toad was Ray Kelly, NBC sound technician, plus an ordinary comb! Mr. Kelly ran his fingers—with the proper pressure—over the teeth of the comb, and it was the cry of a tree toad to you! The continuity writers care little for the labors of the production department. If their imagination conjures up situations calling for footsteps in the mud, an arrow imbedding itself in the heart of a jungle savage, coffee boiling, bacon frying, a man’s head being split open with an ax, the writ- ers write merrily away and trust to the ingenuity of the technicians to imitate the sounds called for by the script. Naturally, some of these sounds must be faked; but, you say, why imitate common sounds such as a boiling coffee poi, for example? Why not put a pot of boiling coffee in front of the microphone and let it go at that? The process, unfortunately, is not quite that simple. Experience has taught sound 68 THE SECRETS OUND Train effect gadgets: Left to right, large drum for chugging; motor-driven wind machine; grindstone for sand brakes; snare drum, distant chugging; air tank, exhaust; toy train under cone, clicking wheels. technicians that the microphone, the ether and your receiving set do queer things to sounds. By the time the bubbling of the coffee pot reaches your ears the sound resembles the roar of the surf. Hence Mr. Kelly and his assistants are not trying to fool you when they boil oil in the frying pan before the microphone and the actor remarks, “Ummmm, that coffee smells good.” They have to fool the “mike.” “Sounds don’t sound as they sound,” says Modern Mechanix and of RADIO'S EXPERTS For programs with a medieval background, equipment above is used. Box-like affair at left imitates sound of heavy door, with latch for drawing of door bolt. On the floor are chains for sound of raising drawbridge. Man at right imi- tates sound of soldiers marching over wooden drawbridge. Mr. Kelly. “To simulate a rap on a window, for instance, the obvious thing is to rap on .window glass with the knuckles. But over the mike,” explains Mr. Kelly, “it sounds too thin. We tried tapping a pencil on glass, but it was too metallic. We tapped slate, books, walls, doors, with knuckles, pencils and xylophone sticks. Finally, by accident, one of the soundmen hit the triple- ply glass that separates the control booth from the studio and the rap went over the mike. Perfect!” When Amos ’n’ Andy first went on the Inventions, January, 1935 Modern Mechanix and Inventions Exclusive Photo In the exclusive picture shown above, NBC artists demonstrate a scene from an air thriller—a head-split- ting sequence. Note soundman about to bury hatchet in cabbage head. Circle left—Ray Kelly, technician, many of whose sound devices are described in accompanying text. air’ with their OK Hotel, a real telephone switchboard was constructed for them at great expense. “It sounded like a house falling down when it came over the air in the rehearsal broadcasts,” Mr. Kelly reveals. Hence you never heard it. The sound en- gineers went into a huddle and when they came out of it they brought with them an ordinary cigar box with a buzzer and dry cell battery on the inside. This was the buzz of the switchboard. Atop the cigar box was a closet latch which produced the noise of a cord plug being plugged into the switchboard. The whole contrivance cost less than a dollar. The vibration sounds of the engines of a steamboat almost drove the engineers from their laboratory to sanitariums. But they finally emerged from what is probably the queerest laboratory in the world with a “dingus” to make a noise like the engine vibrations. It is very simple. A length of iron pipe is suspended from a support by a heavy spring. The pipe is given a tug and the tortional action of the spring comes over the ether as the vibrations of a steam- boat engine. Footsteps in the mud? Well, the “plum- ber’s friend” proves to be the sound en- gineer’s friend also. Working a sink plun- ger up and down in a box of wet bran (Continued on page 118) 69

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RIDING the SKYWAYS Mel Swanson’s famous group of flying stars in the shadow of the tri-motor, Left to right: Billy Morgan, Paul De Weiss, Mel Swanson, Virginia Whittlesey and the late Jerry Wess- ling, killed making a delayed chute jump at Floyd Bennett field just before he was to have rejoined Swanson’s flying troupe as a parachute jumper for the 1934 summer season. GQURWING for points of vantage, the crowd masses against the guard rail at the air- port. Quickening curiosity marks every face. An air of expectancy hangs over the ficld. Even the local pilots have shut off their motors. America’s ace barnstorming outfit is going into action. Mel Swanson and his Flying Stars are playing the field. High in the sky—10,000 feet up—a man suddenly bails out of an airplane. A streak of white trails him as he drops, hurtling to- ward the crowd at the airport ramp. On the field a tarpaulin has been spread for a land- ing target. “PII bet anybody in the crowd five bucks that he lands withing fifty feet of the tarp!” barks a man with a megaphone, There are no takers. The crowd has learned from experience that Mel Swanson’s parachute men are among the best in the business. The daring stunt man hurtles earthward. At a thousand feet—maybe five hundred— he pulls the ripcord. Snap! And the parachute whips to a mushroom. 74 Photo shows a modern barnstorming troupe—Mel Swanson’s tri-motor, the sound car and stunt plane, a Waco J-6. This all-star outfit is known at airports from coast to coast. Then he flies the chute in toward the mark, not knowing how many dollars his chief may have placed on him; but seldom has he failed to hit terra firma more than an arm’s reach from the tarp. The cheers of the crowd have scarcely died away when the plane from which the stunt artist has leaped suddenly goes stark wild, like a thing flown by a demon. Screaming chandelles, loops over and under, everything in the book from Immel- mans to whipstalls are performed with such rapidity that spectators wonder what sort of flying fiend is at the stick. With a final screaming dive that grips the stomachs of the spectators, the ship comes into the field. It taxies to the line and out steps little Virginia Whittlesey, age 24, America’s premier woman stunt pilot. She is another member of Swanson’s all- star cast. Tricks of the Barnstorming Trade What is this, you ask—a major air show? The answer is “No, just part of the daily program with a modern barnstorming out- fit.” By means of stunts like these, coupled with a keen knowledge of crowd psychol- ogy and sales ballyhoo, Mel Swanson, pre- mier barnstormer, has built up a record of having flown more than 310,000 people—a greater number than any other man in the world. The stunts are a necessary part of Swanson’s program. The barnstorming business has changed since the old days: when pilots hedge- hopped from one cabbage patch to another in antiquated Jennies, hoping to pick up an occasional five dollar bill. Delayed parachute leaps, autogyro stunting, aerial acrobatics and unbelievably large and in- terested crowds—these form the modern barnstorming picture in which chain store methods have capitalized the human urge to fly. Modern Mechanix and With Modern Barnstormers by WESTON FARMER Yesterday the barn- stormer flew his old Jenny from one cab- bage patch to another, seeking scattered fares; today crowds throng airport ramps to ride his powerful tri-motor. “Weve had to marry Barnum and Bailey to the airplane,’ chuckled Mel as we watched Billy Morgan, Paul De Weiss and Sergt. Richter hop aloft with record crowds. “Six years of big league barnstorming have changed the old time picture a lot. We’ve modernized everything, and this law of averages the chain stores use has taught us a lot about selling rides to the flying public.” On this knowledge Mel has built what is probably the best known of nine high pow- (Continued on page 122) When crowds begin to grow restive and business slacks off, the modern barnstormer cuts loose with parachute jumps and stunt flying to hold attention. Small towns, like that directly above, once popular, are now shunned by operators who have made a business of barnstorming. Inventions, January, 1935 75

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THE history of the new national sport of -skeet is a record of amazing progress. From its inception in 1920 on the grounds of the Glen Rock Kennels in Andover, Mass., clubs have sprung up all over the United States. Today, one will find skeet being shot even in the smallest of hamlets. Skeet, which gets its name from an old Scandinavian form of the word “shoot,” has already gone far beyond its sponsors’ LEAD UNDER For Thrilling SPORT by CAPT. W. H. FAWCETT Noted Publisher, Sportsman, Manager and Member of 1924 Champion American Olympic Trapshooting Team expectations. There are several reasons for this, mainly, because the average hunter wanted some form of wing shooting to test his skill and, incidentally, afford practice during the off months when he, or she, wasn’t allowed by law to hunt game. The factor of chance and ego also play a large part in the popularity of this new and ex- citing sport. We glean from the Official Skeet Rule and Handbook published by the National Skeet Shooting Association, Inc., of Boston, Mass., the following interesting facts. Safety is the first and greatest considera- seb Skeet will improve your marksmanship, The speed and angle of targets resemble field conditions, Ol ol In laying out the field first drive the stakes AC 40 yards apart. With B as center draw a semi- circle. Then mark off eight stations. Here is the general layout of a skeet field. The blind- ers prevent shattering targets from striking the marksman. The opening “in No. 7 trap house should be less than three ft. above the ground. The opening in No. 1 is 10 ft. Modern Mechanix and Lay out a skeet field and tty this fascinat- ing shooting game. You will forget golf, bridge, and meals attempting to chalk up a better score. Here are good pointers from an outstanding leader in the sport. tion when choosing a skeet field. There- fore, a liberal allowance should be granted for the range of the guns. It is estimated that the danger zone measures 300x600 yards so that your field should be consid- erably larger than this area. Laying Out the Skeet Field A skeet target, similar to those thrown in the companion sport of trapshooting, is smaller and, consequently, harder to hit than a game bird flying at equal speed. For this reason, it is advisable to have a clear sky background. In laying out the field, drive two stakes 40 yards apart, as shown in diagram labeled AC. The line that connects these stakes should run northwest by southwest as, or- dinarily, the light is better when shooting toward the northeast. Stake B should be (Continued on page 130) y Above two good skeet positions are shown. Don’t lean over on your stock, but stand with the shoulders leaning forward. Keep head in vertical position. Above are the relative shot patterns of different gauge guns. Proper leads are given below. Two singles are first shot from 8 stations, then 4 sets of doubles from 1, 2, 6, and 7 and an optional shot. DIRECTLY AT BIRD 1RD FULLY SNAP SHO JUST COVER M OUTGOER ~ AHEAD AND UNDER. | INCOMER-LEAD OUTGOER- _| AHEAD AND OVER, INCOMER-LEADS f| INCREASED LATERAL AND SIMILAR TO 1,2,3 BUT LATERAL AND DECREASED aise ee LATERAL AND UPWARD DOWNWARD AND FASTER FROM e UPWARD LEADS LOW TRAP Inventions, January, 1935 81

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If possible clean rifle from breech as shown here. Run water soaked flannels through first, then dry and follow with oiled flannels. Grease gun until ready to be used. TEE .22 caliber rifle in its many patterns and makes is one of the most popular guns in North America. All other makes of guns in the world could not begin to come up to the total number of these popu- lar small bore rifles now in use. Undoubtedly when the .22 caliber rifle was first made in this country it was con- sidered as fitted for the boy only. However, its popularity grew rapidly among adult hunters as well as boy hunters. As a result the gun makers set about perfecting the gun and the demand for the .22 increased. Today we have guns in this class that are far more accurate and powerful than the .22 of the past. At the present time the .22 brass cartridge case has been perfected to the point where a pressure of upwards of 24,000 pounds to the square inch may be exerted. The .22 long rifle cartridge, loaded with modern smokeless powder, has a muzzle velocity of well over 1000 feet per second, and will carry up to 1400 yards. This cartridge is accurate up to 200 yards and close in the bullet will go through five pine boards. 82 N Advantages of .22 Rifles for Hunting ~ SPORTSMEN’S Sok by ROBERT PAGE LINCOLN There are three varieties of .22 cartridge, the Short, the Long and the Long Rifle. The .22 Short cartridge is the one most consistently in use. Since it is accurate up to 25 yards or more it is ideal for squir- rels, rabbits and other game that may be shot within comparatively close range. It is more nearly the kind of ammunition the boy should use, especially in well settled sections. At that, the extreme, uninterrupt- ed range of the .22 Short is 1000 yards. It has been stated that .22 Long is likely to become obsolete, with the Long Rifle tak- ing its place. The .22 Long Rifle cartridge is used extensively in target work. It is con- sidered one of the best vermin cartridges, especially when hollow point bullets are used. Many men.in the woods are using the hollow point .22 L. R. cartridge in killing deer, a practice that is not to be commend- ed, although if a vital spot is reached this bullet will down a deer with ease. The trouble with using the .22 on big game is that it often cruelly wounds the animal, leaving him to suffer for days. Greased or Greaseless Bullets? Shoot the kind. of shell your gun calls for. It should be understood that these guns are chambered to take the .22 Short, the .22 Long or the .22 Long Rifle cartridge, and as they are chambered, for that one cartridge and that only they should be used. To attempt to use the wrong cartridge may lead to damaging the rifling and injuring the accuracy. of the rifle. Whether greased or greaseless bullets are best to use in the .22 is a subject of con- tention. Some claim the greased bullet pro- longs the life of the barrel because of the grease protection. This may be true, but the practice of dumping greased bullets into hunting coat pockets, there to gather dirt, dust and lint, and then shoving them into the gun uncleaned, is certainly far from beneficial. As opposed to this the dry, un- greased shells may be kept in the pocket without encountering such conditions. To properly clean your rifle use the new water method. Run a flannel patch that has (Continued on page 127) Modern Mechanix and Try a Small Boat for Big Fish For real fishing thrills wrestle swordfish and sea bass from an outboard motor boat. by PAUL W. GARTNER When the sea giant strikes, a battle, often lasting houts, begins. Some anglers take 150-lb, fish on six-ounce rods. SICKLE-LIKE fin knifes through the bounding surface of the ocean. Ex- perienced eyes identify a marlin swordfish, the prince of big game fishes. A small boat, powered by an outboard motor, cautiously circles the finned giant, as he lazily cruises about the sun-warmed surface. Two eager fishermen drop their baits to troll them across the path of the marlin. But will the sea titan strike? : $ Breathless moments, and the long shadow of purple and silver darts toward one of the skittering baits. He grabs the lure and whirls away, as the free spool of the angler’s reel quickly and silently rips off line. Tensed and excited, the man can hardly resist the temptation to strike, but he knows he must wait unlil the game has swallowed the bait fish. Inventions, January, 1935 Cruisers and yachts are not necessary for big game fish- ing. Boats 16 to 20 ft. long powered by ‘outboards make the sport more thrill- ing. Above is an 18-ft. skiff. Below a marlin swordfish leaping, trying to shake loose the hook. They often leap 10 ft. in theair. Now the marlin pauses, but in a second opens up with a terrific run. The stout rod whips upward, and for an instant there is severe tension on rod and line. The battle has begun. A dozen times the marlin rises vibrantly above the rolling blue, while the angler realizes a thrill which many claim is unexcelled in any other field of sport. Such jis big game fishing as it is practiced from small craft in southern California wa- ters. Swordfishing is no longer a sport to be (Continued on page 127) 83

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Gwo Tube All-Wave Radio By using the new triple-function 6C6 tube, foreign reception with headphones, local programs on the loudspeaker are obtained with this compact two-tube all- electric long and short wave. receiver. ROTOR 1S GROUND! TO PANEL > C STATOR I$ INSULATED ROM PANEL Chassis and panel dimensions for 2- tube all-electric, all- wave receiver are shown above. Mount ground terminal at right of phone jack, run ex- tension cord out at left. 6% oo 2 Al GROUND fe NTENNA SW — 6, ESRAS GROUND TERMINAL IS NOT INSULATED FROM ‘METAL, CHASSIS PHONES OR 7 MIDGET. SPEAKER _TWIN PHONE JACK QA TAP AT 350 OHMS Ñ am Da 0005 MFD : Kass OX È CA 50000 OHM I TO 110 VOLTS POTENTIOMETER p- A.C. OR D.C. WITH SWITCH s CONTACT ARM TERMINAL 90 Qy, ROTOR GROUNDED @ TO METAL ee | ADDITION to bringing in broadcast entertainment, this compact two tube all- electric receiver provides the thrills of for- eign short wave reception. It will work anywhere where 100 to 120 volt power, either alternating or direct current, is available. The set is built up on a metal chassis cut from aluminum or any available sheet metal. The metal front panel also serves as the front of the ornamental crackle finish metal cabinet used so extensively by short wave set builders. The entire set, with tubes, coils, and headphones, weighs less than four pounds. Though designed for headphone opera- tion, this set will operate a small magnefic speaker very nicely on the powerful local stations. Two or more sets of phones may be employed at the same time if desired. For foreign reception a good outdoor an- tenna with one of the commercial noise- eliminating lead-in systems is recom- mended, but for local broadcasts even a short indoor aerial will prove satisfactory. The circuit is beautifully simple. Only two tubes are used, one of these, the type ’37, with plate and grid tied together, serv- ing only as a rectifier. 4 PRONG PLUG-IN SHORT WAVE COILS VARIABLE TUNING CONDENSER „00014 MFD. ANTENNA TUNING CONDENSER (MIDGET) 3 TO 5 MMFD. INSULATEO FROM PANEL All connections below and above chassis show in perspective sketch of completed set. Set sliding tap on 400: ohm resistor at distance equal to one- eighth of total length of winding to get 350 ohms. Zn \ CENTER TAP 8~8 MFD. DOUBLE SECTION ELECTROLYTIC CONDENSER Modern Mechanix and ugs Into LIGHT SOCKET The new 6C6 tube used in this set actually does the work of three ordinary radio tubes, picking up the radio frequency signals, de- tecting them, then furnishing the audio frequencies for the headphone. Naturally, regeneration is used to make the set as sensitive and selective as possible. A potentiometer shunted across the tickler winding of the plug-in coil serves as regen- eration control. The Cisin Universal A.C.—D.C. circuit permits this set to be used interchangeably on alternating or direct current. The fila- ments of the two tubes are connected in series with-a 350 ohm voltage limiting re- sistor. In case a pilot light is desired for the tuning dial, this is connected in series with the tube filaments and shunted by a 30 ohm wire-wound resistor. The voltage limiting resistor should then be set at 320 ohms. A small trimmer condenser in the anten- na circuit permits use of either a long or short aerial, and gives an added tuning control on weak short wave stations. (Continued on page 126) Plug-in coils shown will cover entire short-wave and broadcast band. Inlog- RE ging stations be sure to record num- BAS ber of coil which was used, since wave bands of coils will overlap somewhat. 15-25 METERS Coik; A: 4 TURNS Fl 50-100 METERS COIL A: 7 TURNS WB: 23 0 © COIL A .000035 MFD. MIDGET VAR, CONDENSER GROUND TC CHASSIS AT THIS POINT ONLY 100-200 METERS 50,000 OHM POTENTIOMETER 2 MEGOHMS w Regeneration control at lower right and large vernier „tuning dial are main controls on this short wave set. WIND COILS WITH ANY SIZE ENAMELED OR INSULATED WIRE FROM NO. 24 TO NO.32 B. & 5. GAUGE 375-550 METERS COIL A7 35 TURNS t Bilas 0 200-375 METERS Standard 4-prong COIL A: 30 TURNS Plug-in coils are 5 B:70 #8 sold by radio sup- ply houses, or can be wound upon radio tube bases to specifications shown here. For broad- cast band coils use standard plug-in coil forms. Wire size is immaterial; .smali wire, perhaps even No. 36, is needed COIL A: I5 TURNS ii to get necessary turns on larger coils. " B:50 TYPE '37 TUBE 30 MH. CHOKE X IS BETTER THAN G m RESISTOR AELE RERE E es Taea = + 79 110 VOLTS A.C. OR D.C. Schematic circuit diagram of set is shown here for those who prefer to plan their own arrangement of parts. Filter resistor of 10,000 ohms may be replaced by standard filter choke if a.c. hum comes through phones. In tuning set, locate station with tuning dial, then adjust regeneration potentiometer until set is just ready to break into regeneration squeal. Antenna condenser need be tuned only for weak short wave stations. Note that set wiring is grounded to chassis at one point only. Inventions, January, 1935 91

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Christmas LIGHTING Effects Electrically lighted Yuletide decora- tions in “moderne” design add a gala holiday aspect to the exterior of any home. The novel effects por- trayed here are easily made in the home workshop at little expense.

“Three Wise

H Men” scene with = candles is used in alcoves hav- ing three win- ~ BLACK dows. Squares ran over design aid ai il 1 in transferring. is BROWN | s WHITE FEEN D I [= jees] elaine sistas Below is squared Paper design for “Merry Christmas” shadow box intend- ed for use on lawn or the house roof. MUSLIN STRIP

| GUMMED: TARE? CORRUGATED",

or the MODERN HOME

CHRISTMAS FLOODLIGHTING BIRCH TREES around the house stand out best when illuminated with red floodlights. BLUE SPRUCE trees require blue floodlighting. EVERGREENS of other varieties stand out with either red or blue illumination. HOME itself uses lights same color as walls, Illustration at right shows how to make “treeless” Xmas tree by using only a ten-foot mast and strings of lights, to be used in a dark corner of your lawn. FIG.10

BORE HOLE LOOPED CORD FORMS i SOCKET FOR LIGHTS ý 3 ©

BOARD

DETAIL OF PYRAMIDS

“LAYOUT FOR 16 é COR. BOARD SIDES OF THE: : arkar x 24" ; A MODERNE

= a XMAS TREE Concealed lights of different colors illuminate silvered pyramids of “moderne” Christmas tree, construction of which is shown above. Frame of tinsel star is coat hanger. UR Forefathers placed a lighted candle in the window on Christmas Eve to flicker a Yuletide message of hospitality to wayfarers, but the custom gradually fell into disuse. Recently it was revived in a more modern form, the electrically lighted candle. The custom is gaining favor again, and in some communities prizes are offered for the most elaborate and novel effects. Here are a few suggestions which may be followed indoors as well as outdoors in your cffort to brighten the holiday season. A lighted Christmas scene, Fig. 6, gives

25 WATT BLUE XR 3 94 Modern Mechanix and

WIRE SCREEN YELLOW PAINT 50 WATT. "= BULB ATA g BEAVER BOARD (& J

i) y \ BRICK PATTERN 47 CREPE PAPER A LIGHT CORD X Fic.8 GIANT CANDLE COVER FRAME WITH CORRUGATED BOARD, STRIPPING JOINTS AS SHOWN FORMER E>

x a a Fic.1| Sees FIREPLACE (DIMENSIONS z TO SUIT ROOM.) STONE PATT ERN LINOLEUM

RED AND YELLOW CHEESE CLOTH

BEAVER

CROSS- SECTION RED CLOTH Fig. 12 50 WATT LAMP

Realistic fireplace with flickering flames is readily built up from light-weight materials. Cover with brick design crepe paper. Pattern for half-section of andiron is shown at right. Inventions, January, 1935 Giant candles are to be set on each side of doorway or gate. Screen dipped in yellow paint gives effect of candle flame. a startling and novel effect when used on the porch roof or lawn. A shadow box is constructed of light material 4’ 6” x 3’ x 8”. The back is Beaver Board painted navy blue. Lay out Santa and the reindeer and the house tops on another sheet of Beaver Board about 4’ 6” x 3’, marking it into the same number of squares as Fig. 5. Using the intersecting lines as guides draw the outlines, then cut out and paint black. Tack the house tops to wooden cleats nailed in place two inches back of the front edge of the box. The other group is fastened with strips of adhesive tape on the back to four fine wires stretched from top to bottom just back of the house tops. Tufts of cotton placed along the edges of the roofs give the effect of snow. Three 25-watt blue lights behind these figures will silhouette them (Continued on page 123) 95

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“How to START Your Car WASTE OR SPONGE OR ` CLOTH, WET WITH ETHER, IS PLACE THE LAMP AGAINST CARBURETOR AND MANIFOLD.. COVER ENGINE WITH BLANKET HIGH TENSION WIRES WITH SHELLAC ONE SIDE OF S CHARGER TO GENERATOR CUTOUT: “TERMINAL CONNECTING Ti tet AMME TER: by L. J. MARKUS INTER brings a multitude of troubles to the auto owner, the most annoying of which is undoubtedly the starting of a car which has stood outside or in a cold garage overnight. Ether has been injected into the combus- tion chamber of engines for years to aid in igniting the gasoline. With modern. cars, where it is difficult to get liquid ether into the engine, soak a sponge or cloth with ether and hold over the air intake of the carburetor while someone is turning over the engine. The fumes will be drawn through the carburetor into the engine, where they mix with the gasoline. The old saying about prevention being better than cure very aptly applies to the car. By keeping the engine just warm enough overnight to prevent oil from con- gealing, there will be no cold-morning start- ing troubles. A 100 watt bulb placed against the car- buretor and left burning through the night will not consume more than five cents worth of electricity, yet will keep the en- gine warm. The regular garage extension light with a wire guard is covered over with old blankets or sacks, to keep the heat in as much as possible. Be careful that no inflammable material touches the bulb it- self. This method is generally used only Ether-soaked rag held near the carburetor intake makes starting of cold engine easier. To keep engine warm during cold nights, place electric bulb near carburetor, then cover engine with blankets. Shellac wires to keep out moisture. STORAGE BATT. FOR STARTING © DEPRESS CLUTCH PEDAL TO DISENGAGE GEARS OF TRANSMISSION.. @ SPIN MOTOR WITH IGNITION TURNED OFF.AND WITH CHOKE OUT.. © TURN ON IGNITION, START MOTOR AND ALLOW IT TO WARM UP BEFORE RELEASING CLUTCH.. ART c. KLUST— Radio trickle charger connected to car as shown will keep battery in good condition for winter driving. Extra storage battery in parallel with car battery will spin starter faster. Strap extra battery down securely. Cold- weather starting procedure for autos is indicated above. Modern Mechanix and in BELOW-ZERO Weather Below-zero temperatures reduce the power of your car battery and at the same time make the engine far harder to start. Try these kinks the next time your engine is too cold and stiff to start. GROUND: TO: FRAME. When battery is almost dis- charged, connect bell trans- former or dry cell as shown above to get the car started. when the temperature gets down to around 20° below. Snow seeping in over the engine will often cause leakage of current from the high tension wires. This can be prevented by shellacking all ignition wires, making them doubly waterproof. Even with the generator charging rate set at the maximum, it will be impossible on some cars to keep the battery fully charged in winter. A radio trickle charger connect- ed to the car battery each night will save many a trip to the battery service station. Attach spring clips to each lead, snapping one to the frame of the car, the other to the cutout terminal. Polarity is correct when the ammeter shows “charge” as the charger is switched on. Where an engine is unusually hard to start, or where a car is left out on the street all day, an extra storage battery is recom- mended. Strap this down somewhere in the back of the car, and make connections with regular starter cable. If the negative of your battery is grounded, one cable should go from the negative of the extra battery to the frame of the car, the other to the positive of the regular battery. In connecting “hot” leads together, scrape off insulation for a few inches, wrap bare cop- per wire over the two leads, and apply solder freely to the joint, using acid if necessary to clean the copper. With this paral Baé. of fet sand placed lel connection both bat- fold karme up engine. teries will be charged at Qyichsp,“esults ave ob the same time by the around carburetor and auto generator. manifold, then pouring on boiling water. With (Cont'd on page 126) carburetor watm, fuel vaporizes more easily, Inventions, January, 1935 START. | MOTOR U ORIGINAL Pe OF WIRE PX" ~ A TO DISTRIBUTOR Se [omne] IGNITION SW, BREAKER” ] Electric iron held against mani fold will take chill from engine. ELECTRIC IRON HEATS MANIFOLD M. WITH BAG OF: CHOT SAND 5 BOILING WATER IS POURED UPON CLOTHS WRAPPED AROUND CARBURETOR MANIFOLD 99

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rint Photographs in COLOR Finished envelope hold- ec having photographic view of old waterwheel printed in color on bur- nished copper surface is shown above. Personal photos or scenic views can be printed directly from negative upon metal, glass, wood, or any othér smooth, light- colored surface by proc- ess described in text. Fig. 2—A strip of cop- per 4%" wide allaround design is poundeddown over hardwood form with wood mallet, work- ing carefully to avoid wrinkles in any one spot. You can inject a personal note into your Christmas gifts this year by placing on them photo- graphs of yourself, of friends or of scenes you have snapped with your camera. Any smooth surface can be treated in this way, includ- ing metal, wood, glass or compo- sition. The pictures are perma- nent, can be made in any color, and have the shiny, glass-like ap- pearance of glazed enamel. As an example of a home shop project easily treated by this process, the construction of a copper envelope holder, an al- ways-appreciated gift, will be ex- plained. Secure a piece of 6 in. by 10 in. sheet copper of about No. 16 gauge from a plumbing shop. Make sure that it has no dents or scratches. A shaping form is made of 1 in. wood, 5% in. wide and with one end cut in a curve or design. Mark the cop- per, at both ends, with the same design, but allow % in. on the edges for turning over. Round all sharp corners of the wood form. Then, with a wood mallet pound down the edges of the copper. Turn the sheet over and pound the edges back down on themselves carefully, using light taps to 102 FIG.3 Fig. 3.—Copper edge is hammered back on itself, working carefully to avoid wrinkles on curved portion. Fig. 4—With edges reinforced, copper is bent into shape of “U”. FIG;t Fig. 1.—Design for letter holder is first cut out from hardwood form. Sheet of cop- per is marked for cutting so that it will be 14” larger, on all sides, than wood form. Trim off surplus copper with tin snips, then file smooth. avoid buckling. This reinforces the sheet so that it will be rigid when it is bent into a “U” shape. Allow 2% in. for the bottom; one side is 3 in. high, the other 4 in. high. With fine pumice or some other good abrasive polish the side that is to receive the photograph until it is smooth and glossy. Dry the surface carefully, and see that no bits of lint or other foreign matter which would cause specks in the photo- graph adhere to it. You can get small sheets of clear gelatine at the drug store; soak several in cold water Modern Mechanix and on METAL Gifts by KENNETH MURRAY until they are limp. Heat a pan of water; into it place a wide-mouth bottle contain- ing four or five ounces of water. Add just enough of the soaked gelatine to make a solution of the consistency of syrup. This must be filtered twice through a wad of cotton in the neck of a funnel, so that it will be entirely clear and free of lumps and particles. The “sensitizer.” is a simple solu- tion of ammonium dichromate. Dissolve as many of the red crystals in an ounce of warm water as possible. Add sufficient of this solution to the liquid gelatine to give the latter a deep orange color. Coating of the cleaned copper surface is done in a room with a yellow light. The light from an ordinary bulb covered with a thickness of yellow paper will be entircly safe. Flow the orange gelatine solution over the copper surface while the latter is held level in one hand. Drain the excess solu- tion back into the bottle to be used again. Allow the gelatine to drip from one corner of the copper while holding it over a gas or electric stove, letting the copper become (Continued on page 122) tograph to Fig. 5—Polish sur- face receiving pho- high gloss, using pumice or other abrasive, Fig. 6—Add softened sheet gelatin to five oz. of hot water in wide- mouth bottle to make solution thick as syrup, Fig. 8—When correctly exposed. before arc lamp or in sun- light faint brown image will just be visible on copper holder. FIG.9 Fig. 9—After masking off Portions of picture not needed, copper is “inked up” with ordinary ink roller and selected color of lithograph ink. Repeat inking process until all de- tails of photo show clearly. Fig. 10.—Photo as well as copper face of letter holder can be protected by spraying with lacquer. FIG.7 Inventions, January, 1935 Fig. 7—After “sensitizer” emulsion has been spread over copper and dried, place envelope holder under negative in print- ing frame. Use yellow light illumination for this work to prevent early exposure. 103

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How to IMPROVE That by DALE R. VAN HORN LAYING THE Ist. SHEET HE roof is the crown on your home. No matter how good the walls, what expen- sive furniture inside, or how well the rest of the structure has been built, without a good roof, your abode is not first class. A suitable covering, both weatherproof and durable, plus adequate support under- neath are the two fundamentals of a good roof. Details may vary. Many homes today are covered with composition shingles hav- ing fire-resisting properties, incorporating the advantages of color combinations. A goodly number of home owners still prefer good old fashioned red shingles. The type of roofing material is largely up to you. If you go into your attic on a bright day and note many pin holes of light showing through, you easily will come to the con- clusion that your roof is in line for a new dress, With this inspection comes, too, the condition of the eaves, the valleys, any sag- ging point, and whether the roof meets the wall without any sign of a gap. One of the newer trends is to close gaps of this nature with a special material, forced into space with.a gun not unlike the type used for force-greasing the automobile. There is no need to mention that the chief advantage of tight unions between walls and

OLOING NAILS SPACEDABOUT 30“ I POF Pare 2 INCHES

CEMENT THE EDGE OVERLAPPED- TURN DOWN SHEET 2 AND NAIL

Above drawings show how to apply roll roofing, Put first strip on lower edge overlapping next until roof is done. Fic.

NAIL STRIP IN PLACE

NAIL ip f- OVER VALLEYS [== A AND RE-FLASH f? Sn 7 NAIL SHINGLES OVER NEW : FLASHING WITH HALF INCH OVERHANG AT EAVES. - CUT AWAY THE OLD SHINGLES AT GABLE EDGES TO PROVIDE SPACE FOR I" X 2" STRIP TO ENSURE |FIG.I SOLID NAILING SUR- FACE FOR NEW SHINGLES HERE

COURSE OF NEW SHINGLES

A SEE FIG | FOR METHOD USED ON GABLE EDGE <== m Figures illustrate steps in putting new shingles over old roof. Shingles at gable edge are cut off and replaced with nailing strip. Old fiashings remain, the new flashings being placed over them. Shingle from bottom upwards. 106 Modern Mechanix and

RE-FLASH WITH \26 GA. TIN (4 OR: “16 INCHES WIDE . DEPENDING UPON SLOPE OF ROO!

ROOF on YOUR HOUSE

Repairing the roof on your home is not a difficult job, Cut down your heat bill by putting new roofing over the old and fol- lowing other suggestions given here by Dale R. Van Horn. ‘When re-roofing consider home revision. Photos show how addition im- Proved ordinary cottage.

2

i,

roof, or between wood and masonry, is the saving of heat in winter. Whereas a few years ago a yard cluttered with old broken shingles and a general mess proclaimed to one and all that the Jones’ were having their roof recovered—today that confusion is missing. Putting the new roof right on over the old is smart because of the saving of Jabor and debris, and be- cause the old covering plus the new gives greater roof insulation properties. Approaching the job in the proper man- ner, it will be wise to keep in mind the several steps portrayed in an accompanying group of illustrations. Note that the shingles are cut away from all edges to permit the laying of a strip. (See Figs. 1 and 2). This applies to roof edges, the ridge and dormers as well. Instead of tearing out old valleys and flashings, foundations for new sheet metal are built up easily as shown in Figs. 3 and 4. From then on, the work progresses much as though the house were new and it was being roofed for the first time. Of even simpler application is composi- Inventions, January, 1935 tion roll roofing, which is laid on as indi- cated in accompanying drawings. Those of you who insist upon asbestos base compo- sition roofing have a choice of the roll roofing, and individual squares of composi- tion asbestos or slate. Some wooden shingles are chemically treated to make them fire resisting. Some- times the roof is fundamentally good, does not warrant the cost of a recovering job. Then by careful patching, and particularly by staining the shingles, a new-roof appear- ance results. When doing over your roof, keep in mind the possibility of finishing the attic. If this is contemplated in the near future, then the floor space should be divided into the future rooms and the studding set in place at this time. Later it will be only a matter of ap- plying the wall finish material and this addition of the studding will more firmly brace the roof timbers. One of the best ways to chink spaces be- tween the wall top and the roof is with con- erete mortar to which has been added a 107

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W a Jogon 5 HHH = ae | ME sort wooro | © T i Le = 43" k— iS 10 54 1!2" | CARDBOARD SIDES GLUED TO 16 ™| EDGES OF FLOOR BOARD by H. T. NIETER ITHIN the last few years the 00-gauge for model railroads has attracted the attention of many who, because of space limitations in their homes, could not build standard 0-gauge equipment. With tracks only %” wide, an entire system including stations, tunnels, bridges,,and semaphores can be set up on a dining room table, or mounted on sections of wallboard which are easily folded up and packed away in a closet. The American gauge or width of 3%” is used for the tracks in this project, this being closer to the gauge width obtained from the 110 kK 1354 GLUE TOGETHER Is" >| _cross E SECTION = k— lT —] OF ROOF L 32 T Side, top, and end views of 00-gauge coach are based upon actual 70-foot railway coach, scaled down at rate of 4 millimeters to foot. Details show how bolster of truck is fastened to floor of coach with single bolt, and how built-up roof fits into the cardboard sides. Model railroad systems in 00-gauge, using tracks but three-fourths inch wide, can be laid out on an ordinary table. H. T. Nieter, Ameri- can model engineer, shows here just how easy it is to build an 00-gauge 70-foot railway coach. 4 millimeter to the foot scale than the %” gauge used by English model builders. With scale disposed of, the actual con- struction of the coach may be begun. The materials specified here are the simplest to handle, and are obtainable at a minimum of cost. The floor is cut from a piece of 14” thick soft wood. Mark each side at a point 14” from the end, then bevel the corners as shown, leaving a 17/32” flat section for the vestibule. ; Locate and drill holes for the truck cen- ters, then cut out the %4%”x%” squares on each end for the steps. The sides of the car will require 1/32” cardboard similar to that used by laundries as shirt-stiffeners. One side and end may be cut in a single piece, or the entire side of the car cut at once. Add a 14” tab wher- ever the cardboard ends are glued together. Following the dimensions on the draw- ing, mark out the windows and doors on the cardboard strips, starting at the center of a section and working toward the ends. Modern Mechanix and for Your Table Top Above details show construction of truck for 00-gauge coach. While brass is preferable, any other available metal may be used. When train is in use, bearings should be kept well- oiled to reduce friction. Lay out full size template for steps to dimensions shown at right, then trace out number need- ed. Make up four or five coaches for each engine used. Cut out the windows in the sides and doors with a razor-blade or sharp knife. At the side doors, recess the card by cutting half-way through from the outside and peeling the layer to give the panel effect of a door that doesn’t come flush with the rest of the side. With the floor on a flat surface, and with its edges coated with glue, stand the sides up, one at a time, against it, pressing them tightly. They may be fastened in place with very small pins until the glue has set. Tie a string around the body now, and let it dry. Although the roof may be purchased as a moulding, make your own if you want by a “bread-and-butter” construction bor- rowed from the model ship-builders. For this, three pieces 10 49/64” long will be needed; the top one to be 1 5/32” wide by 3/16” thick, the middle one 1 17/32" by 1%”, and the bottom, which fits inside the (Continued on page 120) Inventions, January, 1935 “Railway Ze ells wae loa

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FOR INVENTORS , And Mechanical | Minded Men N À 138 Answers to Questions on Page 29 By patenting the invention. Send sketch or model and descrip- tion with search fee to a registered patent attorney. 1101 U. S.—1279 Foreign. Abraham Lincoln. 17 years, It confers on patentee the exclu- sive right to make, sell and use the invention covered by the patent. ie) Nm No. Pencil sketch and description will usually suffice. aj A form on which an inventor may execute his sketch and descrip- tion. When properly filled out it is documentary evidence of your conception of the invention. oe 9 Because a layman or a lawyer in general practice is not learned in patent office practice. 10 As soon as patent application covering the invention is filed in United States Patent Office and official receipt received. CLARENCE A. O’BRIEN Registered Patent Attorney 317-R Adams Building Washington, D. C. (Copyright Clarence A, O’Brien) Small Ideas May Have Large Commercial Possibilities If you hope to realize profits from your invention, you must protect it with a United States Government Patent. Otherwise you may find that all your time and labor i have been lost, because it often hap- pens that other inventors are work- ing on the same idea. If you have an idea, take steps to get a patent at once! THE Free Book shown here was pre- pared for inventors, to show them exactly what steps they must take to secure a PATENT. If you have an idea, you should send for this book AT ONCE. It will tell you exactly how an application for a Patent is made, what infor- mation you must furnish your attorney, and what steps he must take in order to protect your interests. Remember, inventing an article is one thing—secur- ing the exclusive right to manufacture it, use it or sell it is another, Without a U. S. Patent, you cannot expect to reap the profits that your invention may make possible. Send at once for this book. After you get that, yow’ll know exactly what to do to proteet yourself. Thank You for Mentioning Modern Mechanix and Inventions for January When Writing to Advertisers KNOW HOW to START KNOW EACH STEP to TAKE Before Going Too Far With Your Ideas Very often, the patent procedure is what we call a “simple” one—as illustrated here. My FREE BOOK “How to Obtain a Patent” describes what to do and how to go about it. Send for it by all means—let me urge, however, that you take the first step (STEP NO. 1 to right) without further delay. It will prevent wasted work, mis-steps, and going ahead “in the dark”—your whole patent procedure depends upon the first step. Immediate Search Necessary A Search at the U. S. Patent Office will disclose one of three things: That you have hit upon an entirely original idea—that you have suggested patentable improvements upon an existing invention—or that your invention has been anticipated throughout, and you should drop it. You should have this information at once. The Search Fee for the First Step (the search) misma te cine Geese | Send tor This FREE obtaining a patent) will be thoroughly explained to you in my FREE BOOK. My FREE BOOK tells everything you need to know about patents. I will mail this book upon receipt of your letter requesting search—or if you want to read it before having search made, simply fill out the coupon below. ALSO FREE RECORD OF INVENTION BLANK This FREE Record of Invention Form en- ables you to make in convenient form a sketch of your idea and have it witnessed in a manner of value to you should the occasion for evidence arise. MAIL THIS COUPON TODAY and obtain my FREE BOOK and Record of Invention Form. STEP NO. 1 f] Make a rough pen- B cil sketch of your invention, describe it fully, and send it to me for prelimi- nary search through U. S. Patent Office —fee $5.00, STEP NO. 2 My trained search- ers will then make a preliminary search of the pertinent U. S. Patents to deter- mine if your inven- tion is probably pat- entable, STEP NO. 3 My complete report of search and opin- don on’ patentability will be mailed to you with copies of U. S. Patents that I consider nearest to your invention. STEP NO. 4 If you decide to make patent appli- cation, for customary fees explained in my booklet, my drafts- men will make draw- ings and proper pa- pers will be pre- pared for presenta- tion of your inven- tion to the Patent Examiner. _ CLARENCE A. O'BRIEN REGISTERED PATENT ATTORNEY eee rs WASHINGTON, D.C. Please send me your FREE BOOK, “How to Obtain a Patent,” and your “Record of Invention” Form, without any cost or obligation on’ my part. rite or print name plainly) Thank You for Mentioning Modern Mechunix and Inzentions for January When Writing to Advertisers 139

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