Stars and telescopes; a hand-book of popular astronomy, founded on the 9th ed. of Lynn's Celestial motions (1899)
Todd, David P. (David Peck), 1855-1939, Lynn, William Thynne, 1835-1911. Celestial motions · Boston, Little, Brown and company · leaf 380
their color. Still, as the image is formed directlyin front of the mirror itself, the head of the observer,if placed in the ordinary position, would interceptnearly all rays from the object. Gregory had dodged Telescopes and Houses for Them 321 this difficulty by mounting a small secondary… … A MODERN REFLECTOR {Newtonian type by Bra shear. Eye-piece nearthe ,,fi7ider at upper end of tube) back of the large reflector. Newton improved uponthis arrangement and preserved the principal mirrorintact by interposing a small diagonal reflector in thepath of the rays just before they come to a…
Astronomy
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