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 341
. It is possible to giveeach A operator a calling device so that she may dial directly. Ifthe local board is automatic, the two-way trunks may end on selectorsfor incoming traffic and selector banks for outgoing traffic. If the service between exchanges requires a toll charge, the radialtrunks will… … Fig. 270.—Network system of exchanges. and the toll operator will record the call in the standard way, after whichthe subscriber will release. When the connection is ready the toll operatorwill call back through the toll switches and thus complete the line. Ifcertain rural lines are permitted to…
Telephone
Internet Archive · California Digital Library · Public Domain Mark 1.0. Free to use for anything.
