A high-school astronomy: in which the descriptive, physical, and practical are combined .. (1859)
Mattison, Hiram, 1811-1868 · New York, Mason brothers · leaf 227
ll the pupil was a foot in diameter. 512. Eelation of discovery to Copernican theory ? Effects upon Galileo ?(His renunciation? Death?) 513. Kinds of telescopes ? Describe. SI 4. How assist vision ? (Illustrative note ?) 1222 ASTRONOMY. 515. Refracting telescopes may consist of a double-convex lens… … Here the parallel rays are seen to pass through the lens at A, and to be so converged toa point as to enter the eye of the beholder at B. His eye is thus virtually enlarged to thesize of the lens at A. But it would be very difficult to direct such a telescope towardcelestial objects, or to get the…
Astronomy
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