Well's natural philosophy : for the use of schools, academies and privte students, introducing the latest results of scientific discovery and research ; arranged with special reference to the practical application of physical science to the arts and the experiences of everyday life ; with three hundred and seventy-five engravings (1873)
Wells, David A · New York : Ivison, Blakeman, Taylor and Co. · leaf 333
qually, we may construct a pendu-lum whose length never varies. Such a combination is represented in Fig. 268, wheroa convex lens of crown glass is united with a concavelens of flint glass, so as to destroy each the dispersivopower of the other, while at the same time the refract-ing, or converging… … THE ANALYSIS OF LIGHT. 329 whati3spheri. Lenses are also subject to another imperfec-caiaberraHonr tioD, which is Called splierical abeiratioD. Thisarises from the fact that the curved surface of a lens is atunequal distances from the object and from the screenwhich receives the image formed at its…
Physics · Science · Technology
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