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
tomake a quarter revolution, but when it registers with the cross it holds the latter securelyuntil the pin rotates around to the next slot. properly spaced on a shaft to take the film. The teeth mesh withperforations of the film and thus secure a positive movement. Of the various intermittent…
Electrical engineering
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