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 301
ircuit iscompleted only through the drop magnet M3, as shown. The use of the common battery wire B B, and the common return wireA, obviate the necessity of running two wires from each push. Thesecommon wires should be larger than the other wires, however, andNo. 16, B. & S. gauge copper wire…
Electrical engineering
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