. Practical wireless telegraphy; a complete text book for students of radio communication . Company is connectedto earth. 104 PRACTICAL WIRELESS TELEGRAPHY. The necessity for mounting the disc discharger on the shaft of the alternator will beat once apparent for if the disc were mounted on an independent motor, any variation in theline voltage would cause the coming together of the electrodes and the alternations ofthe charging current to fall out of step, but when the disc is mounted on the shaft anyreduction of the frequency of the charging current will be immediately compensated forby the s
. Practical wireless telegraphy; a complete text book for students of radio communication . Company is connectedto earth. 104 PRACTICAL WIRELESS TELEGRAPHY. The necessity for mounting the disc discharger on the shaft of the alternator will beat once apparent for if the disc were mounted on an independent motor, any variation in theline voltage would cause the coming together of the electrodes and the alternations ofthe charging current to fall out of step, but when the disc is mounted on the shaft anyreduction of the frequency of the charging current will be immediately compensated forby the simultaneous reduction of the speed of the disc. In the diagram of Fig. 116, the moving electrodes (mounted on the disc) are shown at1, 2, 3, 4, etc. The spark, for example, passes from stationary electrode A to an electrodeon the disc, through the disc and out at electrode B. The effective length of the rotarydischarge gap is much greater than the actual distance between the stationary and revolvingelectrodes would indicate; actually the spark discharge begins long before the electrodes. MUFFLINGDRUM Fig. 116—2 K. W. Synchronous Disc Discharger of the American Marconi Company. are directly opposite. Hence for favorable working the minimum distance between theelectrodes should be about .005 inch. This will give a clear spark discharge and will notsubject the condenser to abnormal strain. One great advantage of the synchronous discharger is that it permits thehandling of very large powers. In fact, the Marconi Company have constructed•and successfully operated such dischargers at 500 K. W. with marked results. An additional advantage of this gap is that it prevents the oscillations in theaerial circuit being retransferred to the closed circuit resulting in more efficientradiation; in other words the quenching is reliable. The one-half kilowatt sets of the American Marconi Company are fitted with APPLIANCES FOR A RADIO TRANSMITTER. 105 synchronous dischargers which are practic
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Keywords: ., bookcentury1900, bookdecade1910, booksubjecttelegra, bookyear1917
