Wentworth, G. A. (George Albert), 1835-1906 · Boston, Ginn & company · leaf 244
Second Method. It is required to findmP (Fig. 54) in the direction of thecentre. mP = mC-PC. But mC = ^DC2+ Dm2 = Vr2-f t2.Hence, Fig. 54. Third Method. m P = -y/i*+f r. … Fig. 55 Place transits at D and E (Fig. 55). Directthe telescope of the formerto 27, and of the latter to A.Turn each toward the curvethe same number of degrees,and mark P, the point ofintersection of the lines ofsight. P will be a point in the circle to which AD andAE are tangents at D and E,…
Trigonometry · Surveying · Navigation
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