Newcomb, Simon, 1835-1909, Holden, Edward Singleton, 1846-1914, joint author · New York, H. Holt and Company · leaf 100
is the angle sought. To facilitate the determination of the exact reading ofthe circle, we have to employ special devices, as thevernier and the 7eading microscope. The Vernier.—In Fig. 3^, M J^ is a portion of thedivided limb of a graduated circle ; C D \^ the index annwhich revolves with the… … 82 ASTRONOMY. the same as that of {n—1) parts on the divided hmb M iVor the reverse. The first stroke a is the zero of the vernier, and thereading is always determined by the position of this zeroor pointer. If this has revolved past exactly twenty di-visions of the circle, then the angle to be…
Astronomy
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