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 56
to be measured, thus making a plat-ting scale. Apply it to the triangle so that one edge of the scale shall passthrough one corner, A, of the triangle, and the other edge through another cor-ner, B ; and note very precisely what divisions of the scale are at these points.Then slide the scale in… … \C B number of divisions on the scale, from the point to which the division A onthe scale has arrived, to the third corner of the triangle—express the area ofthe triangle A B 0 in square chains. For, from C draw a parallel to A B, meeting the edge of the scale in C,and draw C B. Then the given…
Surveying
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