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 217
ner of the box is the subscribers means of control. Inside the meter there is the counting mechanism (5 numeral wheels)a group of electrical contact springs, and a polarized electromagnetwhose winding is shunted by a condenser. In normal operation, the subscriber dials the desired number inthe… … Fig. 177.—A subscribers push-button meter. springs. By them a dead short circuit is placed on the transmitterand a low resistance (30-ohms) shunted around the receiver. The calling subscriber can hear the called party as he answers, butcannot speak to him. Pressing the button moves the counting…
Telephone
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