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The Electrical Experimenter LTRIACYH E-XPE-FittlE - ft www.americanradiohistory.com IOVV TO 1000000 VOLTS LOUIS CTEINBERGER'S PATENTS J;\ ? MARK. Adopted by U SOa NAVY REG. U.S. PAT. OFF. & FOREIGN COUl1TRiES. and all the Commercial Wireless INSULATION. Telegraph Companies 4; anfaq Gama 4500 4502 4507 4517 6277 /%fiG,Rro.se_ ggiweeparaaevs-' 6265 6933 6295 7121 s- -7137 ..-ROO ?\\? It &:` 7370 6288 6839 GO -72 Washington St. BROOKLYN, N. Y. ELECTROSE FG. CO., 66 -76 Front St. AMERICA UNUSUAL The "Albany" Rotary Variable Condenser is unusual insofar as it is an article with a conscience. It combines efficiency and Brandes Wireless Headsets beauty. Considered a real bargain at its reg- ular price of $3.25. For a limited time it will he sold at the unusual price of,$2.50, The "SUPERIOR" Type Note these specifications: The case is one piece of polished aluminum 4" in diameter and 4" high. It may ho filled with oil with- out leakage, and this Increases its capacity Price, Complete, Five Dollars approximately live times. There are 31 aluminum plates, 1G station- ary and 15 rotating. These are fastened to a q This is the headset used by Mr. Chas. E. Apgar in polished fibre top which fits tightly over the conjunction with his special apparatus for making case. The top is provided with a celluloid scale, pointer, knurled knob and binding the phonographic records of the Sayville station as posts. described page 210 in The maximum capacity, without oll, is on August issue of the Electrical .003 31íd. Experimenter. Mr. Apgar chose Brandes Receivers It is particularly adapted for a series con- denser in the primary circuit of a coupler. after careful comparative tests with other makes. After reading the above you must agree with us that we have an unusual article at Send stamp for catalogue "E" fully describing all our headsets. an unusual price. Send for No. 3.1r2 .lPinny Condenser at $2.50, postage extra. shipping weight, Ih=. Delivery from Wireless Receiver Specialists stook. Circular of our complete line ou C. BRANDES, Inc., reym.=t. MAGUIRE & SHOTTON 32 UNION SQUARE, NEW YORK 814 LANCASTER ST. n_L9 R-PRY ALBANY, N. Y. Von benefit by mentioning "The Electrical Esperimenten" when writing to advertisers. www.americanradiohistory.com The Electrical. Experimenter Published by Experimenter Publishing Company, Inc. (H. Gernsback, President; S.. Gernsback, Treasurer; M, Hymes, Secretary), 238 Fulton St., New York Vol. III Whole No. 30 CONTENTS FOR OCTOBER, 1915 No. 6 FRONT COVER -"AURORA BOREALIS." From painting by AN ELECTRO- MAGNETIC NAIL- PACKING MACHINE Thom. N. Wrenn. By F. C. Perkins 259 THE AURORA BOREALIS OR THE NORTHERN LIGIITS ELECTRICITY ON GERMAN SUBMARINES 280 By II. Winfield Secor 243 MARCONI HEADS WIRELESS CORPS OF ITALIAN ARMY 281 BARON MUNCHHAUSEN'S NEW SCIENTIFIC ADVENTURES. A NEW ELECTRICAL PHOTO PRINTER 281 By Hugo 246 HOW THE "MOVIES" EXPLOIT WIRELESS 262 Gernsback LARGEST STATIC MACHINE IN THE WORLD 283 THE GRAVITATION NULLIFIER. (A Scientific Story.) ELECTRIC SPARK PICTURES -HOW TO MAKE THEM 285 By George Frederic Stratton 249 NEW TELEPHONE SET FOR AVIATORS 266 CONSERVING UNCLE GEORGE By Thomas Reed 252 ELECTRICITY AND THE MODERN AUTOMOBILE TORPEDO TRANSFER THOUGHT WAVES, 253 By Samuel Cohen 287 CAN ELECTRICITY MODERN APPLICATIONS OF THE LOUD SPEAKING TELE ELECTRIC TOYS THAT RESPOND TO THE VOICE 255 PHONE 268 A LIGHTHOUSE OPERATED AND CHECKED BY ELECTRICITY "THE CONSTRUCTOR" DEPARTMENT 289 By E. O.. Catford 256 "RADIO" DEPARTMENT 278 ELECTRIC DENTAL SIGN THAT DEMONSTRATES "BEFORE" RECEIVING WIRELESS MESSAGES WITH ODD AERIALS...274 -275 AND "AFTER" EFFECTS 256 "HOW -1'O- MAKE -IT" DEPARTMENT 282 INSTALLING A COMPLETE ELECTRIC SERVICE IN FIFTEEN WRINKLES. RECIPES AND FORMULAS. Edited by S. Gernsback 286 MINTES 257 "WITH THE AMATEURS" 2.287({6 TELEPHONE THAT TELLS WHO CALLED WHILE YOU LATEST PATENTS 289 WERE OUT 258 PIIONEY PATENTS 289 A TELEPHONIC NURSEMAID AND A BIRD ALARM QUUESTION BOX 290 By F. C. Perkins 258 PATENT ADVICE 296 J4\:J4\.lJh J \. 1/1 IIJR{1 llll11 J \G S PATEN T OFF\C ,1 r \ C F W'G hávèAOften had- óccasion to feel amused at to exist in France and Belgium, according to the best t é blank -astonishment of the average well- authorities. informed European when he first spies the In Germany, Austria- Hungary and Russia amateur hundreds of aerials which now decorate a Wireless is absolutely unknown. There have never been multitude of houses in our cities. When we inform the any amateur Radio stations in these countries to the stranger that, according to trustworthy statistics, there best of our knowledge. The governments of the above are now between 350,000 and 400,000 purely amateur countries are exceedingly strict in the transmission of Wireless stations scattered all over the United States, intelligence by Radio telegraphy and no, licenses are there is no end to his wonder. ever granted, with the exception of those to savants and This is not surprising if we consider the fact that to a few universities. But even here the restrictions the United States to-day is the only country that places are formidable. practically no restrictions upon the Wireless amateur. The rest of the world. with the possible exception of Iii America everybody is allowed to put up a Radio a few South American countries where less than 200 receiving station, and while a license must be obtained stations flourish, measures up poorly as far as the for sending messages the regulations are far from Wireless amateur is concerned. It is believed that out- severe and any intelligent youth, as a rule, finds it com- side of the countries named there now exist less than paratively easy to obtain the coveted license. 300 amateur radio stations. Outside the United States there are, therefore, considerably less than 15,000 such Now let us turn to other countries. Of course, during stations. In other words, there are in America twenty - the war in the affected countries no amateur stations five times as many amateur Radio stations as in the are allowed to operate, the penalties for the offenders entire world. It is, indeed, a surprising result and being extremely severe and usually a long term of speaks well for the enterprise of American imprisonment is meted out to the unlucky operator. the ex- perimenters. The conditions prevailing before the war and which Nor can the average European understand will presumably prevail again after peace is re- estab- of what earthly good the lished are briefly these: youthful Radio amateur is, for he argues that Great Britain and its dependencies: No Wireless correctly not all of them can possibly be- come amateur stations can be erected without the consent of commercial operators. But he forgets that the the Postmaster General. In Australia, previous to the average amateur must of needs have a higher intel- war, amateur Wireless was all but suppressed. Of ligence than his card -playing, dance -hall -resorting class- England's colonies Canada probably has the greatest mate. Indeed, when your average Radio amateur has Wireless freedom, although a license from the Post- mastered all the intricacies of a Wireless set, he has master must be obtained. In Great Britain proper, it obtained a pretty thorough knowledge of electricity in has been estimated that not more than 2,000 amateur general. As a rule, most of our electrical industries, Wireless stations prospered before the war. In France big and little, require thoroughly practical young men, and its colonies and in Belgium the same conditions the ones who know how to do. things. This is where prevailed as in Great Britain. It seems, however, that the amateur shines, and nine times out of ten he lands the French amateurs, just previous to the outbreak of the job over the head of the untrained, theoretical the war, engaged in a petition to the Government, plead- young man. íJ.. ing for greater Radio freedom. Results of the petition For this reason American parents, as a rule, encour- I) are unknown at this time. Of all the foreign amateurs age their son, for they know that he does not waste the French are probably the most active. Before the' his time. The amateur wireless station seems to be a L! war some 1,500 amateur Wireless stations were known first -class investment. H. GERNSBACK. l!J Al . Jill . J L J L J L! 111_ 1 _L _L L11 Jl l 1 1 J J J J l1JL1J1JIJ1J1J1JLJ11J1J11J11J1.J11 11 241 www.americanradiohistory.com INTENSIFYING TRANSFORMER This Special Trans- SEND FOR COPY OF OUR UNIVERSAL DETECTOR STAND former is construct- ed .especially for M- tensi[ying ín- coming .. New Wireless - signals. It can he used for \ intensifying signals received from any Manual No. 9 crystal detector by It contains tables and diagrams, iu connecting an audl- on detector on the many of which never printed before 9111110'Ip1QP" and is positively the most up-to -date other side of the on dd;!ïIledW. transformer winding. book wireless yet published. By employing it We make a charge of 10e. for it, hetween two audlon for which we give a coupon which detectors s i g n a l s amount will be allowed on an order will be Intensified amounting to $1.00 or more. from 10 to 25 times. Send for our Pocket Catalog W 28 As many as three It contains over 240 pages, with This Stand has a heavy brass cup, with four of these transformers can he connected between audlon detectors in over 1,000 illustrations, describing in binding screws, capable of holdlug crystals up to cascade, forming an intensifier, making it possible to read signals plain, clear language all about every- and including y in.
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