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
riangle A B 0 = A B C\ But the area ofthis last triangle — AC multiplied by half the width of the scale, i. e.,= AOxl=AC. But, because of the parallels, A 0 = A C, thereforethe area of the given triangle A B 0 = A C ; i. e., it is equal in square chainsto the number of linear chains read off from…
Surveying
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