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 70
other, forward, backward and sideways,or the whole lamp can be swung forward or backward, laterally, and up and down. 2,724 HAWKINS ELECTRICITY The Film.—This is made of celluloid, being similar to thefilm used in ordinary cameras, excepting that it comes in longstrips, one thousand or more feet in…
Electrical engineering
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