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 56
Figs. 3,820 to 3,826.—Construction details of Simplex film gate. It is made of machine steel,the lugs securing the gate to the holder being electrically welded. Fig. 3,820 representsmilled surfaces. The film trap shoes (figs. 3,820, 3,825), are of steel ground on bothsides and beveled (fig. 3,820)…
Electrical engineering
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