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 429
e must be sufficient illumination. Since objects are seen by-means of the light which they reflect, more light must be thrown ondark objects than on light ones. 2. There must not be too much illumination. Too strong a lighttires the eye, partly due to the muscular effect of contracting the iris,and… … ,G NnC ?y Aj INNERPR I Figs. 3,465 and 3,466.—Horizontal section through center of holophane globe, and magnifiecross section view of three adjacent internal prisms. In fig. 3,466 the single ray of lightA is diffused by being broken into two components—B E F G by reflection and refraction,and BCD…
Electrical engineering
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