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 337
s the loop-dialing circuit to the auto-matic switches. When the receiver is taken from the hook, the line relay pulls upand closes the line to the automatic switchboard. The operation of thecalling device is thus relayed to the switches, and the connection estab-lished in an obvious manner. Figure… … Fig. 264.—Rural telephone, magneto, simplex dialing. Code Ringing Machine.—There is now in use a code-ringing machinewhich is part of the central office equipment which is capable of givingbetter signals than can be made by hand. As many as twenty codesare available, although good service from the…
Telephone
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