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 104
ry distant. One such line having been determined, a point in the nexthigher or the next lower one is fixed, and the preceding oper-ations repeated. (138.) On a long, narrow Strip of Ground, such as that re-quired for locating a road: Run a section across it at every \or -J mile, about in the line… … (139.) On a Broad Surface. Level around it setting-stakes,at points of the desired height, and then run sections across it,and from them obtain the contour-lines as before. The external lines here serve as checks to the cross-lines. (140.) Surveying the Contour-Lines. The contour-lines thusfound…
Surveying
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