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 59
Figs. 3,842 to 3,845.—Threading a typical motion picture machine. Fig. 3,842 illustratesthe method of threading the film through the film trap by forming the upper loop with thesecond finger of the lefthand and gripping the film below the intermittent sprocket withthe first finger. Fig. 3,843…
Electrical engineering
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