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 289
Fig. 3,266, shows a form of metal pear push.It consists of an ordinary push enclosed in a pearshaped box of either metal or wood, attached tothe end of a cord, having two insulated conduc-tors branded in it. The cord usually leads to some form of wallrosette, and for convenience permits the…
Electrical engineering
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