The geography of the heavens, and class-book of astronomy: (1858)
Burritt, Elijah H. (Elijah Hinsdale), 1794-1838, Mattison, Hiram, 1811-1868 · New York, Mason brothers · leaf 322
COMET SEEKER. 5.0 W. 101. A Comet Seeker is a re-fracting telescope, with a largeaperture and short focal distance.As comets cannot be found bytheir right ascension and declina-tion, but often have to besearched up, by sweeping aroundthe heavens with a telescope, be-fore they become visible to… … REFLECTING TELESCOPES. 102. The Reflecting Telescope is one in which the light is con-verged to a focus by means ofa concave metallic reflector orspeculum. Like the Refractors, they may be constructed withvery little mounting ; though for convenience in use, it is neces-sary to place the reflector…
Constellations · Stars
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