A treatise on surveying, comprising the theory and the practice ; (1887)
Gillespie, W. M. (William Mitchell), 1816-1868, Staley, Cady, 1840- [from old catalog] ed · New York, D. Appleton and company · leaf 345
ore described. 330 LAND-SURVEYING. The vertical circle, or arc, of the transit, is used for a lati-tude-arc. Adjustments. 479. The first, second, and third adjustments are similar tothose of the solar compass, already explained. 480. To adjust the Polar Axis. Level the instrument carefully,and then… … rectangular blocks attached to the declination-arm. If the bubbleremains in the center, the polar axis needs no adjustment in theplane of the axis of the telescope. If not, bring the bubble to thecenter by means of the two capstan-head screws under the hour-circle, and in line with the telescope.…
Surveying
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