Elementary natural philosophy : designed for high schools and academies (1881)
Griffin, La Roy F. (La Roy Freese), 1844-1916 · Philadelphia : Sower, Potts & Co. · leaf 216
CHAPTEE III. OPTICAL INSTRUMENTS. 716. Some of the more important optical instruments,which depend upon the principles already considered, arehere described. They consist of combinations of prisms,lenses, and mirrors. Section I.—The Telescope. 717. Telescopes are of two general kinds, Reflecting… … Fig. 241.718. A Reflecting Telescope consists of a mirror M, Fig. 241, ofmetal or of glass faced with metal, and an eye piece, O, usually REFRACTING TELESCOPES. 207 a convex lens. Such telescopes are made in a variety of forms.The figure gives the form adopted by Sir William Hershel. Themirror M…
Physics
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