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 287
PUSH CENTER … HOLES FOR WIRES Figs. 3,260 and 3,261.—General construction of an ordinary push button. Fig. 3,260 ex-terior view; fig. 3,261 interior view. In the figure four holes are seen in the base; thewires pass through two of these and the other two are for screws to secure the button inplace. strips A and…
Electrical engineering
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