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 576
in the system, etc., are madewith the aid of a fluorescing screen or fluoroscopy This deviceconsists of light tight box A, fig. 4,691, provided with an aperturefor the eyes at B, and an opening C, at the opposite end for the 3,230 HAWKINS ELECTRICITY fluorescing screen D. The latter consists of a… … Fig. 4,691.—Fluoroscope. A, box; B, opening for eyes; C, opening for screen; D, screen.
Electrical engineering
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