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 45
Figs. 3,810 to 3,812.—Various achromatic lenses. Fig. 3,810 and fig. 3,811 are types usuallyused in photography, and fig. 3,812, a combination used in motion picture and stereopticonprojection. Achromatic Lenses.—The color effect caused by the chro-matic aberration of a simple lens greatly impairs…
Electrical engineering
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