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 391
he top of the rod on the down-hill side. Try this by leveling over two screws, setting the instrument sothat one pair of opposite plate-screws shall point in the direction ofthe line, but do not be too particular ; it is a waste of time. Doing this produces sights of unequal length. The rod… … slopes so steep that the rod is too near the level to be read. If thisbe impossible, keep notes of the lengths of the sights to the turn-ing-points, backward and forward, and as soon as possible take DIFFICULTIES. 377 sights unequal in the contrary direction till the differences oflengths balance…
Surveying
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