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 59
73. Third Method.—Instrumentally.tain instrumental operations on the plat. By performing cer- 74. Reduction of a many-sided figure to a single equivalenttriangle. Any plane figure bounded by straight lines may be re-duced to a single triangle, which shall have the same content. This can be done by… … Fig. 47. Let the trapezium, or four-sided figure, shown in Fig. 46, be re-quired to be reduced to a single equivalent triangle. Produce one side of the figure, as 4 — 1.Draw a line from the first to thethird angle of the figure. Fromthe second angle draw a parallelto the line just drawn, cuttingthe…
Surveying
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