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 196
from making out-going trunk calls by the use of a special type of repeater on the outgoingtrunks and the use of a 350-ohm resistance coil shunt across the terminalsof the bridge cut-off relay winding of each switch which is to be allowedto have outgoing trunk service. The circuits of a line switch… … X-Ad justed very weak Y and Z to Close onlu when line sw. has 350 to Coil connected accross the B.C.O. coil Fig. 168.—Discriminating outgoing trunk circuit. bridged across the bridge-cut-off coil terminals. The repeater has thecustomary double-wound quick-acting line relay L.R., slow relay…
Telephone
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