Hawkins electrical guide ... : questions, answers & illustrations : a progressive course of study for engineers, electricians, students and those desiring to acquire a working knowledge of electricity and its applications ; a practical treatise (1914)
Hawkins, N. (Nehemiah), 1833-1928 · New York : T. Audel & Co. · leaf 43
ains it as long as a connection is up. Ques. What is a characteristic feature of this system? Ans. The removal of the subscribers receiver informs centralof the subscribers presence at the telephone. 2,136 HAWKINS ELECTRICITY Common Battery Switchboards.—Fig. 2,942 shows amodern switchboard… … Fig. 2,942.—Modern switchboard and distributing frame. Except for very large P.B.X.switchboards, the distributing frame shown is not used, the connections being made at theregular cross connection box. The adjustable transmitters, and the head receivers andcords, are shown on this two position…
Electrical engineering
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