Wentworth, G. A. (George Albert), 1835-1906 · Boston, Ginn & company · leaf 225
Fig. 38. 52 SURVEYING. The Three Point Problem. Let A, B, C represent three points determined and plottedas a, b, c (Fig. 39) ; it is required to plot by the plane-table,d representing a fourth undetermined point D. … Fig. 39. Determine the point d by the method of resection; first,from A and JB, then from A and C. If the three lines froma, b, and c meet in a point, this will determine d. Ordinarily,they will not meet in a point, but will form a triangle of error,ac be ab. Through a, b, and ab ; a, c, and ac;…
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