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 425
er-level, are sufficiently accurate between bench-marks not verydistant. One such line having been determined, a point in the nexthigher or the next lower one is fixed, and the preceding operationsrepeated. 410 TOPOGRAPHY. 619. On a Long, Narrow Strip of Ground, such as that requiredfor locating a… … mediate points at these heights between the stakes. These sectionscheck the levels. 620. On a Broad Surface. Level around it setting-stakes, atpoints of the desired height, and then run sections across it, andfrom them obtain the contour-lines as before. The external lines here serve as checks to…
Surveying
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