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You cannot afford to delay a 1 am not obligated in any way. right now for this wonderful Free Book Name day. Send Address that is pointing the way for thousands to big money City State in Electricity. The coupon brings you this book en- Give age if under 16. tirely Free, without obligation. Fill it out. Science and Invention fur April, 1924 1185 r Be An Electrical Expert At $75 to $200 a Week Every up-to-date fellow knows what a future there is in electricity. Big pay-fascinating work on land or sea-rapid advancement in a field where jobs are ten times more numerous than trained men to fill them, where $75.00 a week is just a fair starter, where top notchers Full down ten thousand dollars or more a year-in a field, where any man if he wishes, can easily have a business of his own, have men working for him, be his own boss! But what the average young man does NOT know, is what a simple, easy, A -B -C sort of a job it is to get started. You Can Start Right Now! Yes, you. 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The Most Practical, Thorough and Condensed Electrical Course Ever Written This is the cnly home study electrical course that gives you the combined practical and theoretical training you must have before you can be a successful electrician without which you cannot succeed-with which you cannot fail. Written not by ONE man, with the narrow one-man viewpoint, but by 22 of the brainiest, most successful, electrical experts ever drawn from the field of practice and theory. Gives you the com- .1nr. a. n plete mastery of the subject-qualifies you as electrical expert to boss jobs-fits you right into the kind of a job you want-and does it in shortest time-at lowest cost-with the Most Binding Guarantee of Results Ever Offered! Satisfaction guaranteed or no sale! We not only SAY we can make you an electrical expert, we Guarantee ßiá AJitiLl itl If you are not absolutely satisfied when you have finished our Practical Electrical Course, we will refund Prac7tealElectricians every nickel you sent us. :Urn Big Pay Experimental Outfit Worth $30 Find out all about our Drafting Course Worth offer. Find out about the Another $30 who have taken FREEt Big Electrical Library Worth $2ffi , this course in preference to all others and MADE GOOD. Find out about the Electric Library-four elegant volumes-worth ;25.FREE but free. About the free Drafting Course worth another $30. The free Experimental and Demon- stration Otitfit, includirg a real, not a make-shift Electric Motor, Wheatstone Bridge, etc.-the most de scientific, high-grade and complete Experimental Outfit ever supplied with a Course in Electricity., Get all the facts without obligation, without expense! Just send the coupon! ' Electrical Own Your Own Coupon Electric Shop American School Dept. E-426 Drexel Ave. and 58th Street, Chicago American School, Dept. E-426, Chicago Please rush all informa- tion relative to your Course Ignition Esperta 'in 1r Electricity. This obligates e me in no way whatever. Name. Address. ead the Pay -Rol I '''''',t2;-)% :t Ó /4 r )e \\@ AA L@n.' \\\a\\\\\ tel u\\P \totq = Vol. XI. tltttttt April, 1924 \)71`\ \ ` E Whole No. 132 \ \ \ No. 12 FORMERLY ,,,,,,,,1111,11,111,1,111111,11,1,1,,,11 ELECTRICAL EXPERIMENTER íllember dudit Bureau of Circulations PUBLICATION OFFICE: EDITORIAL & GENERAL OFFICES: 18,430 Jamaica Ave., Jamaica, N. Y. 53 Park Place, New York City Published by Experimenter Publishing Company, Inc. (H. Gernsback, Pr -s.; S. Gernsback, Treas.; R. W. DeMott, See'y). Publisher of SCIENCE AND INVENTION, RADIO NEWS, and PRACTICAL ELECTRICS Taibre of Coneene5 loft- Apirill POPULAR SCIENTIFIC ARTICLES "THE MIRACLE," :\ WONDER O1' MODERN EDITORIAL By II. STAGECRAFT By W. B. Arvin 1214 Gernsback 1195 HEARING THE SOUNDS OF INSECTS 1217 IS THIS PERPETUAL MOTION By C. Marshall 1196 By W. \V. Rodgers CONSTRUCTION OF SUPER -AIRSHIPS 1196 LATEST PATENTS By Ruth A. Krohn 1243 ANCIENT THE ORACLE-QUESTION AND ANSWER BOX.... 1245 CLOCKS By Charles Beecher Bunnell 1197 PATENT ADVICE Edited' by Joseph SCIENTIFIC MATING 1193 H. Kraus 1266 By H. Gernsback, Member American Physical Society A GAMBLER'S TRICKS EXPOSED-By Mark Mellen 1199 RADIO ARTICLES AWARDS OF $10013 MONTHLY PRIZES 120(1 A RADIO EQUIPPED CHURCH...By J. F. Odenbach 1231 TRAVELING ON A LIGHT WAVE 1201 SIMULTANEOUS BROADCASTING 1232 By Ernest Brennecke PORTABLE RADIO SET AND NEW LOOP THE MAX ON THE METEOR-PART FOUR OF SOME NOTES ON LEAD-INS A SERIES By Ray Cummings 1202 SEARCHLIGHT CAUSES FADING 12'13 DR. HACKENSAW'S SECRETS --NO. 28-THE By C. Doville Walker SECRET OF SIZE By Clement Fezandié 1204 SELF-CONTAINED PORTABLE RECEIVER WORLD'S GREATEST BRIDGE FOR "GOLDEN YOUR VOICE MADE VISIBLE 3513.!4 GATE By H. Winfield Secor 1206 EFFICIENT CRYSTAL RECEIVER.. By Gilbert Billin 1235 PREPARATIONS MADE FOR SHENANDOAH'S A CRYSTAL SET LOUD TALKER 1236 POLAR FLIGHT By Graser Schornstheimer 1208 COMPRESSION TYPE RHEOSTAT 1236 VISION VIA SOUND WAVES 1210 By Armstrong Perry ANCIENT METHODS OF RAISING WATER 1211 RADIO SET AND PHONOGRAPH COMBINATIONS 1237 By L. B. Robbins SELECTIVE RECEIVERS - FROM BEST TO THE TRANSIT OF MERCURY. By Donald H. Menzel 1212 SIMPLEST By A. P. Peck, A.M.I.R.E. 13,íc WEATHER LEGENDS AND PROVERBS 1213 IMPROVING THE SINGLE CIRCUIT TUNER 124' "THE MIRACLF \ WONDER OF STAGECRAFT 1214 By Jack Kay By W. B. Arvin RADIO HAZARDS PROBLEMS OF AIRSHIP CONSTRUCTION 1215 RADIO ORACLE 124113411 HEARING THE SOUNDS OF INSECTS 1217 RADIO BROADCASTING STATION CAL L By W.