Newcomb, Simon, 1835-1909, Holden, Edward Singleton, 1846-1914, joint author · New York : H. Holt and company · leaf 96
Fig. 28.—a transit rNSTKUMENT. and from the times of these tra:nsits as read from theclock to determine either the corrections of the clock orthe right ascension of the observed body, as explained inChapter I., §5. THE TRANSIT INSTRUMENT. 75 It lias two general forms, one (Fig. 28) for use in… … —I jJaJjEYl Fig. 29.—portable transit instrument. The ends of this axis terminate in accurately cylindricalsteel pivots which rest in metallic bearings V F, in shapelike the letter Y, and hence called the Ys. 76 A8TU0N0MT. These are fastened to two pillars of stone, brick, oriron. Two counterpoises…
Astronomy
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