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 109
FIRST SYSTEM. 91 2. Sloping up on all sides; i. e., a hollow, Fig. 106. 3. Sloping down on three sides and up on one; i. e., acroupe, or shoulder, or promontory, the end of a ridge orwater-shed line, Fig. 107. 4. Sloping up on three sides and down on one; i. e., avalley, or thalweg, Fig. 108. 5.…
Surveying
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