Stars and telescopes; a hand-book of popular astronomy founded on the 9th ed. of Lynn's Celestial motions (1901)
Todd, David P. (David Peck), 1855-1939, Lynn, William Thynne, 1835-1911 · Boston, Little, Brown · leaf 374
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 Tkem 321 this difficulty by mounting a small secondary… … A MODERN REFLECTOR {Newtonian tyfie by Brashear. Eye-piece nearthe finder at upper end of tube) back of the large reflector. Newton improved upon this arrangement and preserved the principal mirror intact by interposing a small diagonal reflector in the path of the rays just before they come to a…
Astronomy
Internet Archive · Gerstein Library, University of Toronto · Public Domain Mark 1.0. Free to use for anything.
