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 372
set the target to the sum or difference ofthe height of the cross-hairs above the first peg, and the true dif-ference of height of the points, according as the first point is higheror lower than the second, and hold the rod on the second point.Sight to it, and raise or lower one end of the… … 2.9942.398 to set near to it, and sight to a rod held on it, and use this readinginstead of the measured height of the cross-hairs. 358 LEVELING. N. B. —This verification should always be used for every level,even after the three usual adjustments have been made ; for it isindependent of the…
Surveying
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