Wentworth, G. A. (George Albert), 1835-1906 · Boston, Ginn & company · leaf 271
EF,so that a signal at C is visiblefrom A and B, a signal at Dvisible from A and C, a signalat E visible from A and D,and a signal at invisible fromD and E. In the triangle ABC,the side AB is known, and the angles at A and B may bemeasured; hence, AC may be computed. In the triangleACD, AC is… … TRIANGULATION 283 compared with the computed value to test the accuracy ofthe field measurement. This net or chain of triangles enablesus to determine the relative position of all the points withrespect to each other. If the point A is, furthermore,astronomically located, and the azimuth of line AB…
Trigonometry · Surveying · Navigation
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