Newcomb, Simon, 1835-1909, Holden, Edward Singleton, 1846-1914, joint author · New York, H. Holt and Company · leaf 112
ndicular to theplane of the divided circle. This last glass is fixed in position, while the first revolves withthe index-arm. The horizon-glass is divided into two parts, ofwhich the lower one is silvered, the upper half being transparent,^ is a telescope of low power pointed toward the… … Fig. 40.—the sextant. (and the index-glass with it), so that a beam of light from thissecond object shall strike the index-glass at the proper angle, thereto be reflected to the horizon-glass, and again reflected down thetelescope E. Thus the images of any two objects in the plane ofthe sextant may…
Astronomy
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