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 20
ar theory, and the undu-latory or wave theory. The emission theory assumes that luminous bodies emit, in alldirections, an imponderable substance which consists of moleculesof an extreme degree of tenuity. These are propagated in right lineswith an almost infinite velocity. Penetrating into the… … 11 Fig. 3,762.—Images produced by small apertures showing the crossing of luminous rays atthe aperture causing inversion of the image. called the luminiferous ether, the luminosity of a body being due toan infinitely rapid vibratory motion of its molecules, which, whencommunicated to the ether, is…
Electrical engineering
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