Lockyer, Norman, Sir, 1836-1920, Seabroke, G. M. (George Mitchell), 1848-1918 · London, Macmillan and co. · leaf 268
the six just mentioned, of less power for reading thedegrees, or larger divisions of the circle. Hence fromthe side of the pier close to the lamp the observer canread the circle with accuracy, and measure the angle,to which we have alluded, made by the telescope whenpointed to any particular star.… … Fig. 119. —Plan of the Greenwich Transit Circle. We must defer giving more explanation of the prac-tical working of the instrument until we have consideredthe clock used in connection with it, and we shall thenshow how the observations are made. One important 24(5 STARGAZING : PAST AND PKESKNT.…
Astronomy · Telescopes
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