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The ELECTRICAL EXPERIMENTER Is Publisht on the 15Th of Each Month at 233' Tions Cannot Be Returned Unless Full Postage Has Been Included 3TORA Electrical Experimenter SCIENCE AND INVENTION THE THOUGHT RECORDER '.*> I r & m 4f. OVER 100.000 COPIES MONTHLy^-lABXlEST emCDLAT ANY ELECTRICAL PUBLICATION. In the Great Shops of Thousands of Electrical experts are needed to help rebuild the world. Come to Chicago to the great shops of Coyne and let us train you quickly by our sure, practical way, backed by twenty years of success. Hundreds of our graduates have become experts in less than four months. You can do the same. Now is your big opportunity. Come—no previous education necessary. Earn $125 to $300 a Month Day or Evening Courses Learn In the Electrical business. Come here where you will Don't worry about the money. Anyone with be trained in Drafting these great $100,000 shops. Experts ambition can learn here. Our tuition is low show you everything and you lea{n right on the ac- with small easy payments if desired. All tools The country is cry- tual apparatus. You work on everything from the and equipment is furnished free. Our students ing for skilled drafts- bell simple to the mighty motors, generators, electric live in comfortable homes in the best section men in ajl line's. Thou- locomotives, dynamos, switchboards, power plants, in Chicago—on the lake—just a few minutes' sands of positions open everything to make you a master electrician. We walk from our school. with princely salaries. have thousands of successful graduates. Just as soon We give you the ad- as you have finished we assist you to a good position. Electricity, Drafting vantage of our big shops. No other school Motion Picture Operating can do this. Now is Become an Expert in 33 2 Months the time to get into this big field. Experts No need of taking from 1 to 4 years to become an Plumbing train you under prac- expert, we have proved this in thousands of cases. tical working condi- The Coyne method of practical training eliminates We teach all these trades and professions in a thorough, practical tions, no books and all books, useless theory and other non-essentials and quickly and such way that finished are ready to step right theory go here. Check trains you in just what you need to know to become when you drafting on | into a position of responsibility and big pay. the cou- an expert. pon below and mail Earn Your Way it at once for full par- Send Today for Big Free Book ticulars. Don't tell yourself you haven't got the money to come to Coyne. If you have ambition and the nerve of a real man, Write today, now, for the book. It tells what that's <« all you need. Dozens of our students every year work Coyne graduates have done. What you in their spare time and earn their living expenses. Dozens of COYNE TRADE can do. Fill in the coupon, check the AND others work in the day time, earn all their expense and attend ENGINEERING SCHOOLS our evening school. Our employment department will help trade you are most interested in or ^ you without charge. ^ Bennett W. Cooke. Director send it a postal card, do now. Dept. 25. 39-51 E. Illinois St. BENNETT W. Director COOKE, ^ Chicago, III. Please send at once your big Free COYNE TRADE AND ENGINEERING SCHOOLS Book— I am interested in [ ] Electricity [ ] Drafting [ J Plumbing Dept. 25 39-51 E. Illinois Street, Chicago, III, Motion Picture Operating : ^ [ ] {Check trade interested in) — May. 1919 ELECTRICAL EXPERIMENTER iillllllllllilllitllllliiiiilllllllliiilllllllllllllllllllliiliiilll!lliiiiiiliillliiiiiiiiiiiiiiiiiiiiilliiiiiiiiiiiiiiiiililliiiilililiilllliliiilllllllllllllllllllliiiiiii!£ "See them E First — Pay E ELECTRICITY O, afterwards" = AS EXPERTS KNOW IT Learn electricity a> you would in actual PRACTICE— in accordance with the methods employed bv the highest paid elec- trical experts in America. The New McGraw-Hill Library of Practical Electricity contains the actual working facts which you need in order to succeed in the electrical field. Ter- rell Croft, formerly with the Westinghouse Company makes the conquest easy for you. A new standard in electrical literature The New Library of Practical Elec- tricity by Terrell Croft marks a new era in electrical literature. The great field of electrical engi- neering, with its limitless possibili- ties of earning power, is brought to you in a form that makes success Gentlemen: In an attempt easy. The Library to express myself about an CROFT^S NEW LIBRARY is a creation OF PRACTICAL ELEC- achievement that TRICITY, I have never is without parallel seen and do not believe there was ever in technical litera- printed in the English language, a ture, because it more comprehensive set of sticks to practice books. It is a library that throughout its is just as valuable to the novice as to the expert, be- 3000.pages. cause it is all practice. Respectfully, E $2 per month GVY H. PEIFER. £ starts you to Chief, Dopl.in Silk Cor- poration, H.izleton, Pa. E bigger pay. Croft's New Library of Practical Electricity. 8 vols. —3000 pages 2100 illustrations Now is the time to prepare for a high salary- -- Now is the time to master electricty. Old books won't do. Amateurish books won't do. ; Not one cent in advance- E Books compiled by "desk authors" or men with no <*" E practical experience will not serve your purpose. Just the Coupon E Practical books are easiest mastered. Practical 2 books, written by practical men, teach you accurately Examine this new Library for ten full days without expense. Find out for yourself why it is now taking if E and rapidly. There is nothing in the Croft Library the lead in electrical book sales in America. Use the books as you see tit for ten days. Look at McGraw-Hill E which you cannot understand. Terrell Croft tells you the hundreds of illustrations that clear up all C° Book Co., Inc. the mysteries in electrical practice. Stick 239 W. 39th St.. - the secrets of success in electricity in plain words, fig- NEW YORK couple of the volumes in your pockets, and ures and illustrations. is left refer to them during the day. Figure out E Nothing to the imagina- $_ Gentlemen: in an instant the problems that have Please send me the Library E tion. There is no guesswork. There is no theory or heretofore taken hours. Practical Electricity (ship- 7 pinsping charges prepaid) for 10 E higher mathematics. free examination. If satis- Then send us $2 per month for factory. I will send %i In ten days Send now for these eight volumes. No matter how eight months, or return * and 5 2 per month until 116 has been entirely at our expense. If n it wanted I will writ© you E many books on electricity you possess, you are unfair risk nothing by returnin for return shipping Instructions. the attached coupon. = to yourself unless you take advantage of this free ex- E animation privilege. No matter whether you are be- E ginner or expert, these books will show you the clear ACT Home Address E road to success. Inspection will prove this. NOW Oily and State /<C Name nf I E 239 W. 39th St., New York. Your Position i iii ii ii i ii iii i ^miiiiiiiiiii iii limn i ii ii i ii iii iiiii in iiiii iii ill mi ii iii imiimi mi 4L You benefit by mentioning the "Electrical Experimenter" when writing to advertisers, perimenter 233 FULTON STREET, NEW YORK Publisht by Experimenter Publishing Company, Inc. ( H. Gernshack, President; S. Gernsback, Treasurer;) 233 Fulton Street, New York, Vol. VII. Whole No. 73 MAY, 1919 No. 1 THE THOUGHT RECORDER Front Cover RECLAIMING METAL DUST FROM FLUE GASES 26 From a painting by Howard Brown TRY THESE ON YOUR AUTO 27 FUTURE RAPID TRANSIT 7 THE TRUE WIRELESS—By Nikola Tesla.—Special Feature Article 28 WILL MAN FREEZE THE EARTH TO DEATH S AMPLIFIER BOOSTS SIGNALS 1,000,000 TIMES 31 By E. T. Brondsdon MULTIPLEX RADIO SYSTEM ADOPTED BY U. S 32 HOW THE FRENCH LOCATED SUBMARINES 9 NEW FRENCH AND AMERICAN AUDIONS 32 VEHICULAR TUNNEL UNDER THE HUDSON RIVER 10 NEW REGENERATIVE VACUUM TUBE CIRCUITS 33 By H. Winfield Secor By Samuel D. Cohen THE THOUGHT RECORDER—NO. 2 FUTURE INVENTIONS.. 12 PRACTICAL CHEMICAL EXPERIMENTS—TESTING OF WOOL, Bv H. Gernsback COTTON AND LINEN By Albert W. Wilsdon 34 PARIS LETTER, by Jacques Boyer, Paris Correspondent of the EXPERIMENTS IN RADIOACTIVITY. PART III 35 Electrical Experimenter 13 By Ivan Crawford LOCATING ENEMY GUNS BY FLASH AND SOUND 14 THE CONSTRUCTOR—THE "NOISELESS" PHONOGRAPH.... 36 NOVEL ELECTRICAL TALKING SIGN IS By Thomas Reed RELIEVING THE SUBWAY CAR CRUSH. By Sidney Gernsback 15 AUTOMATIC BELL RINGING ATTACHMENT FOR EIGHT DAY MY INVENTIONS, PART IV, by Nikola Tesla 16 CLOCK By T. A. Neelin 37 THE NEW YORK AERO SHOW 18 HOW-TO-MAKE-IT DEPARTMENT—PRIZE CONTEST 40 MONSTER ESCALATOR FOR NEW YORK SUBWAY 20 WRINKLES, RECIPES AND FORMULAS. Edited by S. Gernsback 42 BRITISH SUBMARINE LOCATER 21 LATEST PATENTS 43 PUTTING IT OVER ON FRITZ By K. K. Sammerin 22 WITH THE AMATEURS—LABORATORY ' PHOTO 'CONTEST .... 44 COLD LIGHT—WHAT IT IS By Rogers D. Rusk, M.A. 23 SCIENCE IN SLANG—THE SPECKS IN SPACE 45 POPULAR ASTRONOMY—ASTRONOMICAL DISTANCES 24 By Emerson Esterling By Isabel M. Lewis "THE ORACLE" 46 EDITORIAL Practlacal Science {HE wonderful age in which we are living perspiration soaks his clothing. Finally he sinks down has never been paralleled in history. We into the snow, exhausted, and if it is cold enough he is have more comforts, more conveniences, soon frozen stiff. Now Eskimos, who have learned a more of everything than human beings bit of science by hard experience, prefer to live pleas- ever had, since the creation of the world.
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