. Practical wireless telegraphy; a complete text book for students of radio communication . Fig. 315—Completed Mast (Guys Not Shown). phase relation between the alternator current and the spark may be varied to the mostadvantageous point, the alternator is built with the armature frame, the machine being of tlierotating field type, mounted in a secondary outside frame, with a track machined in itsinside circumference. On this track the armature frame may be rotated through an arc equalto the angle between the poles, by means of a hand wheel. Thus the spark may be made todischarge the condenser
. Practical wireless telegraphy; a complete text book for students of radio communication . Fig. 315—Completed Mast (Guys Not Shown). phase relation between the alternator current and the spark may be varied to the mostadvantageous point, the alternator is built with the armature frame, the machine being of tlierotating field type, mounted in a secondary outside frame, with a track machined in itsinside circumference. On this track the armature frame may be rotated through an arc equalto the angle between the poles, by means of a hand wheel. Thus the spark may be made todischarge the condenser at any desired point of the sine wave. The dischargers are set msound muffling rooms and the leads run up through the ceiling to the oscillation trans-formers mounted on the floor above. These rooms are exhausted by motor-driven blowers 302 PRACTICAL WIRELESS TELEGRAPHY. ^O^C/TfOh. side: vicv^oscillatiom transformer Fig. 316—Side View of 300 Kilowatt Oscillation Transformer. of capacity sufficient to keep the air fresh and to draw out the air, which is admitted bythe high pressure blast used for quenching the spark. One of the precautions taken to provide an uninterrupted service is to duplicate any andall pieces of apparatus which are at all likely to be disabled. Thus, two generators and twodisc dischargers are supplied for each station, and a ready means provided to connect eitherone to the bus and the oscillation transformer.
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Keywords: ., bookcentury1900, bookdecade1910, booksubjecttelegra, bookyear1917
