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
ONOMY. A COMET SEEKER. 528. A Comet Seeker is arefracting telescope with alarge aperture and short fo-cal distance. As cometscannot be found by theirright ascension and declina-tion, but often have to besearched up, by sweepingaround the heavens with atelescope, before they be-come visible to the… … 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…
Astronomy
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