Newcomb, Simon, 1835-1909, Holden, Edward Singleton, 1846-1914, joint author · New York : H. Holt and company · leaf 88
Pig. 25.newtonian tblescope. Pig. 26.cassegkainian telescope. The Cassegrainian Telescope.—In this form a second-ary convex mirror is placed in the tube of the telescope 68 ASTRONOMY. about three fourths of the way from the large speculumto the focus. The rays, after being reflected from thelarge…
Astronomy
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