Sharpless, Isaac, 1848-1920, Philips, G. M. (George Morris), 1851-1920, joint author · Philadelphia, J.B. Lippincott company · leaf 289
Newton, and the third by SirWilliam Herschel; hence their names. In the Gregorian the rays, after being reflected by thelarge mirror, are collected on a smaller one, situatedin the position of mn, Fig. 77, but so placed as to re-flect the rays directly back to M. The eye is placedback of the… … Fig. 76.—Newtonian Reflector Equatorially Mounted. ASTRONOMICAL INSTRUMENTS. 285 tube where the eye-piece is placed. The observer looksat right angles to the direction of the object which hewishes to view. Fig. 77 shows the course of the raysof light through a Newtonian telescope. M is the con-cave…
Astronomy
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