Automatic telephony; a comprehensive treatise on automatic and semi-automatic systems (1921)
Smith, Arthur Bessey, b. 1875, Campbell, Wilson Lee · New York : McGraw-Hill · leaf 293
e tonormal. Momentary movements of the hook switch will not advancethe wipers of the frequency selector very far. When the called subscriberhangs up his receiver for a sufficient time the frequency selector willreach normal. On the last contact the circuit of the release magnet M-12of the selector… … $47 346. 345 344 343 342 341 Fig. 232.—Selector for reverting calls. selectors. The . called subscriber releases the connector as abovedescribed. Reverting Calls.—When a subscriber desires another subscriber who ison the same party line, the operator will tell him to hang up his receiverfor a…
Telephone
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