A natural philosophy : embracing the most recent discoveries in the various branches of physics, and exhibiting the application of scientific principles in everyday life .. (1899)
Quackenbos, G. P. (George Payn), 1826-1881 · New York, Cincinnati [etc.], American book company · leaf 278
of the image is of no consequence in observing the heavenly bodies ;but, when objects on the earth are viewed, we want an erect image, and there-fore in the Terrestrial Telescope two additional lenses are introduced to cor-rect the inversion. 714. Reflecting Telescopes.—In Reflecting Telescopes,a… … The mirror SS isplaced at the farthestextremity of the tube,inclined so as to makethe rays that fall uponit converge towards theside of the tube in whichthe eye-piece a b is fixed to receive them. The observer at E, with his backtowards the heavenly body, looks through the eye-piece, and sees the…
Physics
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