Newcomb, Simon, 1835-1909, Holden, Edward Singleton, 1846-1914, joint author · New York, H. Holt and Company · leaf 95
irection ofa stars apparent diurnal motion.This metal plate can be moved rjghtand ieft by five screws. The hori-zontal wires, guide-wires, a and Z>,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 wliolc transit is in adjustment when, first, the axisT^ 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…
Astronomy
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