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 57
h a calling device like that shown in the illustrations. The only feature of the telephone which is peculiar to automaticsystems is the calling device. The signaling, receiving and transmittingcircuits and apparatus may be the same as those used in any common-battery manual telephone. It is… … Fig. 39.—Automatic telephone callingdevice. AUTOMATIC ELECTRIC COMPANYS APPARATUS 41 Telephone Circuit Diagram.—A diagram of a typical circuit is shownin Fig. 41. When the receiver is removed and the switch-hook rises, the
Telephone
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