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 102
-m co-2 w fe °< S O d ^ a3 §3 •T^ftJOd^.^^I § o H C o d Q v ? ~ - co ■+-■ ^ j82 rti^i> « CO d o ea THE TELEPHONE 2,195 often results in a complaint from subscribers that at times their friendscall them and they are informed that the party does not answer,although they are at home at the time… … Fig. 3,042.—Circuit diagram of Western Electric interrupter, for changing direct battery cur-rent to both alternating and pulsating ringing current. The alternating current is pro-duced like any pole changer produces it. The pulsating current is taken off the contactsat the ends of the arms, the…
Electrical engineering
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