A high-school astronomy: in which the descriptive, physical, and practical are combined .. (1853)
Mattison, Hiram, 1811-1868 · New York, F. J. Huntingdon [etc.] · leaf 234
KEFLECTING TELESCOPES. 529. The Reflecting Telescope is one in which the lightis converged to a focus by means of a concave metallicreflector or speculum. Like the Refractors, they maybe constructed with very little mounting; though, forconvenience in use, it is necessary to place the reflectorin a… … In this cut, the light A is seen passing from the object on the right, and falling uponthe concave surface of the reflector at B, from which it is reflected back to a focus, andenters the eye of the observer at C. This telescope has no eye-piece. 530. The focal distance of a concave reflector is…
Astronomy
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