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
n and dispersion occur. This causes a separation of the white light into its various colors andcauses images to have colored edges. This defect which is most observa-ble in condensing lenses is due to the unequal refrangibility of the simplecolors, and is called chromatic aberration. MOTION… … Fig. 3,809.—Achromatic lens, consisting of a combination of a double convex lens of crownglass, and a double concave lens of flint glass. Whenever it is desired to project especiallygood pictures upon a screen, lenses are often combined as shown in the figure. Here Mindicates the line through the…
Electrical engineering
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