Newcomb, Simon, 1835-1909, Holden, Edward Singleton, 1846-1914, joint author · New York, H. Holt · leaf 94
Fig. 28.—a transit instrument. and from the times of these transits as read from theclock to determine either the corrections of the clock orthe right ascension of the observed body, as explained inChapter I., § 8. THE TRANSIT INSTRUMENT. 75 It has two general forms, one (Fig. 28) for use in… … Fig. 29.—pout able transit instrument. The ends of this axis terminate in accurately cylindricalsteel pivots which rest in metallic bearings V V, in shapelike the letter Y, and hence called the Ys. 76 ASTRONOMY. These are fastened to two pillars of stone, brick, oriron. Two counterpoises W W are…
Astronomy
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