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 355
■^m/TP?- points, as A, in Fig. 346. Measure the height of the level lineabove the point. Then direct this line to a rod held on the other 340 LEVELING. … point, and note the reading. The difference of the two measure-ments at A and B will be the difference of their heights. Second Method. Let A and B, Fig. 347, represent the two points. Set the instru-ment on any spot fromwhich both the pointscan be seen, and at sucha height that the levelline will…
Surveying
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