A treatise on surveying and navigation: uniting the theoretical, the practical, and the educational features of these subjects (1852)
Robinson, Horatio N[elson], 1806-1867. [from old catalog] · Cincinnati, J. Ernst · leaf 207
description of the sextant, it isnecessary to give the following important lemma. If the exterior angle of a triangle be bisected, and also one of theinterior opposite angles, and the bisecting lines produced until theymeet, the angle so formed will be half the other interior opposite angle. Let… … THE PLANE TABLE. 203 f^BSSR resented in the figure ), andeach of the equal parts of theangle B by y. Let A repre-sent the angle A, and E theangle E. Now as the sum of the threeangles of every plane triangleis equal to 180°; therefore, in the the triangle ABC, we have ^+2y-r-(7=180° (1) Also, in the…
Surveying · Navigation
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