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 77
Figs. 3,893 to 3895.—Views of Universalmotion picture cam-era. Fig. 3,893 frontview showing lens, flywheel, shutter, andaperture adjustment;fig. 3895, right sideshowing film channelsprocket wheel andshuttle movement.The adjustable shut-ter may be set forfrom 25% to 50%exposure. Under or-dinary day…
Electrical engineering
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