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 288
sure a good contact with the wires. Fig. 3,262 shows a type of desk push, designed to fit a three-quarterinch hole, no screws are needed for fastening, as the spring clips A, A,press against the sides of the hole with sufficient force to hold the pushsecurely in place. The centers cannot turn… … Figs. 3,262 to 3,265.—Various forms of push button. Fig. 3,262 desk push button; fig.3,263, name plate push button; fig. 3,264, flush plate push button; fig. 3,265, indicatingpush button. The indicating push button shown in fig. 3,265 has a small buzzer insidethe push button which will indicate…
Electrical engineering
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