Synopsis
This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1916 Excerpt: ...of ringing depends upon the frequency or rate of reversal of the alternating current. As the quality of the ring depends largely upon the position of the gongs, they are made adjustable with reference to the ball of the clapper. The Kellogg ringer has no provision for adjustment of the distance between the armature and magnet poles after leaving the factory. As this adjustment is very close, a strip of German silver is placed between the armature and magnet poles to keep them from coming into direct contact and thus freezing or sticking together. The gongs are adjustable as in the ringer described above. CHAPTER VIII THE SUBSCRIBER'S TELEPHONE SET 101. The Complete Telephone.--The following separate pieces of telephone apparatus have been discussed: The battery, transmitter, induction coil, receiver, generator, and ringer. These parts make up the talking and signalling circuits, and in order to have successful commercial operation must be connected in a certain manner. It is necessary to save battery current when the transmitter is not in use; hence some means must be provided for opening the battery circuit when the instrument is idle, since the transmitter itself never opens this circuit, but merely changes or controls the resistance of the same. The receiver must also be disconnected from the line when not in use, so as to leave the line free for signalling currents. The signalling circuit must be disconnected when the talking circuit is being used. 102. The Hook Switch.--The above connections are established and broken by the hook switch. In order to make the action of the hook switch as nearly automatic as possible, the hook is made the most convenient point on which to hang the receiver when it is not in use, as it is not rigidly attached to the telep...
"synopsis" may belong to another edition of this title.
