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
the end. The most important points to be determined are: 1. At the top and bottom of slopes. 2. At the changes of slopes in degree. 3. On the water-shed lines, and on the thalwegs. 4. On cols, or culminating points of passes. (149.) Forms of Ground. It will be found on the iuspectionof a… … all sides; i. e., a hill, Fig. 105. Fig. 106. Fig. 107.
Surveying
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