. Practical wireless telegraphy; a complete text book for students of radio communication . ed form of the timed-spark oscillation generator is shown in U. S. Patent 1,136,477of 1915, one arrangement being that shown in Fig. 287. Here a direct current generator isindicated at G and a choking coil at L-1. Since G has an electromotive force of about 10,000volts, condensers K-1 and K-2 receive a charge which enables them to discharge across thespark gap. A terminal of either condenser is connected to the disc dischargers, D-1 and D-2,and the studs of the latter are placed so that condensers C-1,
. Practical wireless telegraphy; a complete text book for students of radio communication . ed form of the timed-spark oscillation generator is shown in U. S. Patent 1,136,477of 1915, one arrangement being that shown in Fig. 287. Here a direct current generator isindicated at G and a choking coil at L-1. Since G has an electromotive force of about 10,000volts, condensers K-1 and K-2 receive a charge which enables them to discharge across thespark gap. A terminal of either condenser is connected to the disc dischargers, D-1 and D-2,and the studs of the latter are placed so that condensers C-1, C-2 and C-3 are alternatelyand successively charged, let us say, through inductance L-2 and successively dischargedand recharged through L-3. The oscillations set up in L-2 or L-3 are made to act inductively on an intermediatecircuit, L-4, L-S and C-4, and if the discs be revolved at a certain speed and are properlytimed, the trains of oscillations induced in the intermediate circut overlap one another, re-sulting in a continuous flow of oscillations in the antenna circuit, A-1, E. W^ 1. IIt:— Fig. 287—One Type of Marconi Continuous Wave Generator. In this system, signalling is accomplished by inserting a high tension relay key in serieswith the source of direct current from the generator or by closing the circuit of the timingdisc. The apparatus for this system has been developed further by the Marconis WirelessTelegraph Company, Ltd., and is not used at present as shown in either Figs. 285, 286 or details of the more modern apparatus cannot be published for the present, but it maybe remarked that a transmitting set of this type is in daily use at the great Marconi stationat Carnarvon, Wales, England, and a similar set will be installed in the transoceanic station3t Marion, Mass., U. S. A. With a power input of less than 100 K. W., the author has copied the signals from theCarnarvon station in New York City during the daylight hours with an aerial 100 feetinlength.
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Keywords: ., bookcentury1900, bookdecade1910, booksubjecttelegra, bookyear1917
