Newcomb, Simon, 1835-1909, Holden, Edward Singleton, 1846-1914, joint author · New York, H. Holt · leaf 95
he direction ofa stars apparent diurnal motion.This metal plate can be moved rightand left by fine screws. The hori-zontal wires, guide-wires, a and 5,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. 77 The whole transit is in adjustment when, first, the axisV V 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
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
