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 102
They are the same lines as would be formed by water sur-rounding the hill, and rising one foot at a time (or any otherheight), till it reached the top of the hill. The edge of the Fig. 97. Fig. 98. Fig. 99.
Surveying
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