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 382
Fig. 3,399.—Beam of parallel rays of light as produced by a search light projector. were turned toward the object illuminated all of its rays thatdid not strike the reflector would be divergent instead of parallel,and would not reach the object to be illuminated. In otherwords the beam of light… … Fig. 3,400.—beam of radial rays of light projected from search light with dispersion lenses. B B
Electrical engineering
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