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 61
AUTOMATIIMPULSE SPRINGS PERMANENT MAGNET^ … Fig. 2,966.—Wiring diagram showing how an automatic coin machine is operated in connectionwith the automatic system. The machine shown differs from the New York type but theprinciple of the return and collect polarized magnet is the same. In operation, whenthe coin falls in the chute it closes the…
Electrical engineering
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