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 44
at is to say, the rays farther from the principal axis are refractedmore than those near this axis. Ques. What ill effect is due to spherical aberration? Ans. The image is slightly blurred. Ques, How may this be avoided? 2,698 HAWKINS ELECTRICITY Ans. By means of a stop, that is to say, a disc with… … Fig. 3,808.—Experiment illustrating the dispersion or decomposition by refraction of \vhitelight. If a pencil of the suns rays SA be allowed to pass through a small aperture in thewindow shutter of a dark chamber, this pencil tends to form a round and colorless image ofthe sun at K, but if a flint…
Electrical engineering
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