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 27
but incertain crystallized bodies, such as Iceland spar, selenite, etc., the incident ray gives rise totwo refracted rays. The latter phenomenon is called double refraction. MOTION PICTURES 2,681 Ans. It is the ratio between the series of the incident andrefracted angles. ; It varies with the… … FlG. 3,774.—Experiment illustrating multi-image in ordinary mirror. Let the flame of a candlebe observed very obliquely in an ordinary mirror. From four to ten images of the flamemay be seen arranged in a row, as here shown. The second image of the series will be byfar the most brilliant. Laws of…
Electrical engineering
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