. Practical wireless telegraphy; a complete text book for students of radio communication . 120 cycle panel transmitters fitted witha quenched gap but unlike the typeP-4 and type P-5, this set is de-signed for the two standard wave-lengths only, namely, 300 and 600meters. For emergency use, a rotaryspark gap is mounted on the end of themotor generator shaft, which may beused in place of the quenched gap when-ever required. A complete circuit dia-gram of the type E-2 set appears inFig. 263, a front view in Fig. 264 andrear views in Figs. 265 and 266. • A number of spare parts, such as an extram
. Practical wireless telegraphy; a complete text book for students of radio communication . 120 cycle panel transmitters fitted witha quenched gap but unlike the typeP-4 and type P-5, this set is de-signed for the two standard wave-lengths only, namely, 300 and 600meters. For emergency use, a rotaryspark gap is mounted on the end of themotor generator shaft, which may beused in place of the quenched gap when-ever required. A complete circuit dia-gram of the type E-2 set appears inFig. 263, a front view in Fig. 264 andrear views in Figs. 265 and 266. • A number of spare parts, such as an extramotor generator armature, motor blowerarmature, quenched gap plates, condenserjars, etc., are supplied, positively insuringagainst all possibility of breakdown. 198. Details of the Circuits andApparatus.—Explanation of the de-tailed wiring diagram shown in Fig. 263 fol-lows: The motor generator is of the Eck type,having a two pole shunt wound motor and asimple shunt field winding for the speed of the motor is regulated by thesliding contact rheostat R and the voltage of. ROTARYDISC OISCHAR&ER Fig. 264—Front View of the Marconi Yi K. Cycle Transmitter. the generator altered by the rheostat R-1. The generator field circuit may be broken by thesmall switch shown in the drawing. The receiving apparatus is thus protected from hum-ming noises due to induction from the A. C. generator circuit. The motor starter is the Cutler-Hammer single step type and is constructed somewhatdifferently than the types employed in the 2 K. W. and yi K. W. 500 cycle panel the main D. C. line switch is closed, the resistance coil S is connected in series withthe D. C. armature. Owing to the almost complete absence of counter electromotive force,the potential difference across the terminals of the armature at the start of the motor islow; hence insufficient current flows through the solenoid windings W to draw up theplvmger P. As the speed of the armature increas
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Keywords: ., bookcentury1900, bookdecade1910, booksubjecttelegra, bookyear1917
