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 60
dinary common-battery manual desk tele-phone which has been converted into an automatic instrument by mount-ing a calling device upon it in a suitable cup clamped to the handle tubeof the instrument. This indicates one of the attractive features of thissystem, which is that almost any… … Fig. 42.— Manual telephone instrument converted into an automatic instrument. Switchboard Apparatus.—The automatic switchboards used in sys-tems of the Automatic Electric Company employ the following principalpieces of apparatus: 1. Lineswitches (primary and secondary) with their master switches.…
Telephone
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