Sharpless, Isaac, 1848-1920, Philips, G. M. (George Morris), 1851-1920, joint author · Philadelphia, J.B. Lippincott company · leaf 301
nthrough the other. 250. Sextant.—The sextant is an instrument fortaking angles on shipboard, or in other places where afixed telescope cannot be arranged. It is shown in Fig.83. It consists of a graduated scale, AA, usually about60° in length, but divided into one hundred and twentyparts. Another… … Fig. 83.—Sextant. The telescope E points directly to this second piece otglass. If now it be desired to read an angle,—for in-stance, to know the height of a given star above thehorizon at sea,—the sextant is held by the handle, sothat the observer, looking through the clear part of theglass D,…
Astronomy
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