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A treatise on levelling, topography, and higher surveying (1876)
Gillespie, W. M. (William Mitchell), 1816-1868, Staley, Cady, b. 1840, ed · New York, D. Appleton and company · leaf 64
rget.If the instrument is exactly over the peg, measure up to theheight of the cross-hairs, as given by the side-screws. (71.) Water. A.—A pond too wide to he sighted across.Drive a peg to the level of the water, on the first side, andobserve its height, as an F. S. Then drive a peg on the… … 46 LEVELLING, TOPOGRAPHY, AND HIGHER SURVEYING. F. S. Sta. Ht. B. S. © 5.0 74 74.89 )81.89 y 50.0048.00 3.006.00 I 53.0054.00 There must be no wind in the direction of the line of level. B.—For levelling across a running stream. Set the twopegs in a line at right angles to the current, although the…Surveying
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