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 176
ing observed, and the side A Bknown,- the other sides can be readily calculated. Then, ineach of the triangles D A C and D B C, two sides and thecontained angles are given to find D C, one calculation check-ing the other. DC then becomes a base to calculate EF,which is then used to find G H, and so… … The United States Coast Survey, under the superintend-ence of Prof. A. D. Baehe, displays some fine illustrations ofthese principles, and of the modifications they may undergoto suit various localities. The figure* on the next page repre-sents part of the scheme of the primary triangulation…
Surveying
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