Newcomb, Simon, 1835-1909 · New York, Harper & brothers · leaf 153
by Sir Isaac Newton was to place a small plane mirror just inside the fo- cus, inclined to the telescope at an angle of 45°, so as to throw the rays to the side of the tube, where they come to a focus, and form the image. An opening is made in the side of the tube, just below where the image is… … Fig. 37 Horizontal section of a Newtonian telescope. This section shows how the lumi- nous rays reflected from the parabolic mirror M meet a small rectangular prism m n, which replaces the inclined plane mirror used in the old form of Newtonian telescope. After undergoing a total reflection from m…
Astronomy
Internet Archive · Wellesley College Library · Public domain (published before 1931). Free to use for anything.
