Elementary astronomy; a beginner's text-book (1899)
Holden, Edward Singleton, 1846-1914 · New York, H. Holt and company · leaf 147
appear bright. in the Focus of A The wires are dark aga-inst a bright ground. Telescope. Tbe lin& ^ sight .g ft Une jomjng the centre of the object-glass and the central one, IV, of the seven verticalwires. The axis VV is horizontal; it lies east and west. WhenTT is rotated about FFthe line of… … ASTRONOMICAL INSTRUMENTS. 127 from rising to setting. As soon as the star enters the field thetelescope is slightly moved so that the star will cross between thelines a and b. As the star crosses each spider-line, I to VII, theexact time of its transit over each line is noted. The average ofthese…
Astronomy
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