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 235
ects it,no adjustment is necessary. If not, correctone half of the apparent error by means ofthe screws C C in Fig. 240. This may dis-turb the second adjustment. Try that overagain, and again perform the operation ofcentering the object-glass. This adjustment is always performed bythe maker, and… … ADJUSTMENTS. 221 327. Fourth Adjustment. To cause the line of collimation of thetelescope to be horizontal when the bubble of the level attached to itis in the center of its tube. Drive two pegs several hundred feet apart, and set the instru-ment midway between them. Level, and sight to the rod…
Surveying
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