The elements of natural philosophy : copiously illustrated by familiar experiments and containing descriptions of instruments, with directions for using : designed for the use of schools and academies (1856)
Sprague, A. W. (Alfred White), 1821-1891 · Boston : Phillips, Sampson & Company · leaf 335
telescopemany of the larger stars, as Sirius, appeared with the splendor of the sun. Lord Rosses great reflecting telescope was constructed with a speculum sixfeet in diameter, being otherways of proportionate dimensions. What are some advantages possessed by reflecting over refracting tele-scopes… … 28=^ 380 TERRESTRIAL TELESCOPE. differs from the reflecting, just described, in having the imagebefore the magnifying-glass formed by lenses instead of mir-rors. Fig. 255 shows the internal arrangement of such atelescope, the principle of which is similar to the compound Fig. 255.
Physics
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