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 31
HAND GENERATOR SECONDARECOIU … Fig. 2,927.—Circuit diagram of magneto settelephone as was adopted by the AmericanBell Telephone Co. before introductionof the common battery instruments.To call central at a magneto switchboard,subscriber turns generator handle andthen talks with battery in transmittercircuit. Transmitter and…
Electrical engineering
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