Newcomb, Simon, 1835-1909, Holden, Edward Singleton, 1846-1914, joint author · New York : H. Holt and company · leaf 97
he direction ofa stars apparent diurnal motion.This metal plate can be moved rightand left by five screws. The hori-zontal wires, guide-wires, a and h,mark the centre of the field. Thefield is illuminated at night by a lamp at the end of theaxis which shines through the hollow interior of the… … THE TRANSIT INSTRUMENT. 11 The whole transit is in adjustment when, first, the axisF F is horizontal; second, when it lies east and west;and third, when the line of sight and the line of collima-tion coincide. When these conditions are fulfilled theline of sight intersects the celestial sphere in…
Astronomy
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