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 170
oming out so, when obtained bythe above rule, proves the accuracy of the calculation of all thepreceding double longitudes. 250. Areas. We will now proceed to find the area or contentof a field, by means of the double longitudes of its sides, which * The last course is a preceding course to the… … 251. Beginning with a three-sided field, A B C in the figure,draw a meridian through A, and draw perpendiculars to it as inthe last figure. It is plain that its con-tent is equal to the difference of the areasof the trapezoid D B C E, and of the tri-angles A B D and A C E. The area of the triangle…
Surveying
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