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 431
FlGS. 3,467 and 3,468.—Diagram illustrating the refraction of light. Refraction is the bendingwhich occurs when rays of light pass from one medium into another. Ray A O, passesstraight through the air to the surface of water, but on entering the water it is bent, sothat it passes along O B. The ray…
Electrical engineering
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