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 79
t attachments. 3. Release itself without interfering with other trunks. A diagram of a circuit of a first selector is shown in Fig. 63. The twoline wires normally run to the line relay LR, but are capable of beingswitched to the line wipers, —W and -\-W. The functions of the linerelay are to… … Fig. 62.—Selector switch. AUTOMATIC ELECTRIC COMPANYS APPARATUS 63 The release relay places a ground on the release trunk and holds itthere during the operation of the switch and until the next switch aheadcan take up that duty. The release trunk will be connected straightthrough the selector when…
Telephone
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