The Electrical experimenter

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Formerlv vdlh the General Electric Co.; former General ^fanai/er of oompany manui,faclu^iffl9 J^riey Elevtric Motors; also forrherlj/ trtlfi Fairbants, Morse & Co.; nuwConsuUino Enffineer and Dlrefior ,of the Wicts EUancal Instt- 'tvte. THE ELECTRICAL EXPERIMENTER IVTav, 191 Write me at once—TODAY! Just send the coupon or a postaL I will give you personal and 20 complete lessons in practical electricity FREE 1 Think of it ! My indivndual instruction for 20 lessons without a cent of cost to you if you act quick. No charge to j'ou for these 20 lessons now or later. I make this sensational offer to secure a few more live students— to show, too, how quickly I can make you a Master Electrician no matter where you live, or what you do. But you must act at once! This offer closes in 23 days! Remember these free lessons are not merely sample lessons, but are a regular part of my full and complete course in electricitv. Send the coupon without delay—TOD.W! Earn $2,500 to $4,000 a Year You can now qualify at home during your spare time, and without giving up your present position or occupation, for that most wonderful of all fields open to the ambitious man—the great and growing field of Electricity! Yes, no matter if you don't know a thing about electricity or never had a bit of electrical experience, I will take you in hand and make you an Expert Electrician so that you should easily earn $2,500 to $4,000 a year and more. And I'll do it so quickly and with so little effort on your part, that you'll wonder how it was possible. No books or tools to buy. I Train You By Mail! Men Wanted I will instruct you personally—make the whole matter so simple for you that you can't help but learn. When you have finished my mstructions vou are an Expert Electrician—ready to take a big paying job or start in for yourself. I show you not only how to do practical electrical work, but how to estimate on jobs so that you can take contracts at big profits. That's what it means to be trained by a man of my practical experience. Mail Coupon Today A. W. WICKS, E. E., Director, Wicks Electrical Institute 81 W. Randolph St. Dept. 295 Chicago. 111. Without any obligation to me whatever, please send me full description of your personal instructions in Electricity and particulars of your special o£Fcr of 20 of your lessons free. Name Street and No. City .Stat«. T\Tierever you go there's alwaj-s urgent demand for Expert Electricians and at big pay. That's because the watchword of the age is, "DO IT ELECTRICALLY." The field of electricity is broadening so fast that there's a big shortage of competent electricians. .\nd the demand is in- creasing every day. YOU MUST ACT QUICK Mail coupon today. I want to hear from you immediately. Don't miss my offer of 20 personal lessons free. Remember this offer is strictly limited to 23 days. Write for particulars at once. Here's your chancel No obligation to you. Send coupon or po.tal NOW! I A. W. WICKS, E. E., Director j Wicks Electrical Institute j 81 W. Randolph St., Dept. 29S Chicago, ni. )'r'U benefit by Menlxomng "The HUctricat ExperirAenter" when writing to aJx'ertis''Ts. I
The Electrlcail Experlmeeter Puhiiaht by Experimenter Publishing Company, Inc 2^i tuliuii Street, New York. l'r.rsi'lL-nt; S. (.ernsljac L. Treasurer;) 2i3 Kultoa Street, New York Vol. V Whole No. 49 CONTENTS FOR MAY, 1917 No. 1 ELECTRIC TOKPEUO UESTKUVEK— From Cover I'rom a ijainting by George Wall A f)NE.MAN ELECTRIC SUBMARINE By H. WinficW Sccor ELECTKI l-VlNc; THE AEKOI'LANE THE AUTOGRAPH OF YOUR HEART By Samuel Cohen COMBATING THE SUBMARINE By H. Gcrnsback SOIRCES OF ELECTRICITY MAGNETISM I'ROnUCES REMARKABLE PHOTOGRAPHS.. By K. F. Mace THE THERAPY OF LIGHT AND THE NEW "RRAY" By H. Rosenthal "EDDY CI;RRENTS"— A Scientific Story... " ' . . By C. M. A.lams THE WASHINGTON'S I!IUT1II).\Y RELAY PRIZE WINNERS By W. H. Kirwan ELECTRICITY AND LIFE- Second Paper ^ By Dr. Frederick Finch Strong EX PERIMENTAL PHYSTCS— Fourth Lesson Bv lohn I I'uria. A.B., M.A.. F.K.S WIRELESS TELEGRAPHY—THE MARCO.NI HIGH POWER S 7 8 10 12 15 20 TRANSOCEANIC STATIONS By E. B. Pillsbury, Marconi Wireless Telegraph Co. HOW THE AUDION REPEATER REPEATS THE IONIC RADIO SYSTEM AND THEORY OF IONIC TUNING By Otto E. Curtis. A.M.. I.R.E. RECEIVING .MARCONI 300 K.W. SPARK STATIONS WITH OSCILLATING Al'DION By .Samuel Curtis, Jr., R.E., U.S. Navy DISTRIBUTED CAPACITY AND ITS EFFECT By Samuel Cohen A STUDY OF THE LAW OF RESPONSE OF THE SILICON DETECTOR CONSTRUCTOR DEPARTMENT—AN ELECTRICAL PARA- DO.\ OR SELECTIVE LAMP CONTROLLER •.•• By Albert H. Seller AN ILLl'MINATED STAGE SULKY. ...Bv Harry S. Townsend A SIMPLE ELECTRIC MOTOR ATTACHMENT FOR PHONO- GRAPHS By R. U. Clarlt, Jd E.\PERI.\IENT.\L CHEMISTRY—Twelfth Lesson ; ••,;,•.;•;• • By Albert W. Wilsdon War and the Radio Amateur HE Radio states Act of 1912, under section 2 l-.vcry such licoist- shall provide thai the President of the I'nited States in time of -war or public peril may cause the closing of any station for radio communication and the remoral therefrom of all radio apparatus, or )nay authorize the use or control of any such station or apparatus by any department of the Government, upon just compensation to the owner. W'e now stand on the threshold of war; indeed, before this issue is in the hands of our readers war will have hcen declared, cir what is equivalent, this country v\'ill be in a state of war. Let us then be perfectly frank with each other, and let us riotic, face the situatitm as lavv-al>iding citizens. it behooves upright, The European war pat- has taught us that messages sent from secret radio plants by spies have licen of priceless value to the enemy. Small wonder then that hysteric officials of all the warring nations have exterminated every possible as well as impossible private wireless plant in their respective countries. Ihit to what good? True, every stationary outfit has been dismantled or confiscated by there's a the warring Governments, but as always : where will there's a way. When the German spies in England and in France found that it was not very healtliy to operate their outfits in attics or in house chimneys— for a sending outfit is soon located—they simply put their radios in touring cars, cleverly concealing the aerial wires inside of the car bodies. The apparatus too were easily concealed, outwitted simply and the English and French were because you cannot locate a moving radio outfit except by pure chance. Which brings us face to face with the question Did it pay the warring nations to kill the few i)rivate Radio stations they had before the war? We are honestly inclined to believe that far from beiiig an advantage, it proved an actual disadvantage. Xo one at all familiar with the tecliniquc of the radio art, doubts for one minute tliat if a spy has the courage as well as the funds—and spies always have both—he cannot be stopt from sending wireless messages if he elects to do so. Working under cover and by rnoving from one place to another, nothing will stop him THE ELECTRICAL EXPERIMENTER is pubUabt on the 15th of each month at ZU Fulton Street, New York. There are 12 numbers per year. Sub- Hription orice is tl..50 n year in U. S. and plcre
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MURDOCK No. 55 SENSIBLY PRICED SENS
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The Electrical experimenter

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