Wentworth, G. A. (George Albert), 1835-1906 · Boston, Ginn & company · leaf 226
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;… … §27. Introductory Remarks. Geographical positions upon the surface of the earth arccommonly determined by systems of triangles which connect acarefully determined base line with the points to be located. Let F (Fig. 40) represent a point whose position with refer-ence to the base line AB…
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