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 190
the fire alarm. This number is arranged the same as the 11 tele-phone in the gate house, except that instead of having a telephone acrossit, it has a high-voltage relay which operates the general fire signal.This signal should have no connection whatever with the code-callsignals. When 99 is called… … Fig. 165.—Fire and police box. to the man reporting the fire to the supervisor. The supervisor camein on 99 by means of his test distributer the instant the alarmwas sounded. The officials hear the report of the fire and in conferencedecide what steps are to be taken, and if it is to be kept a…
Telephone
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