A treatise on surveying, comprising the theory and the practice (1906)
Gillespie, William Mitchell, 1816-1868, Staley, Cady, 1840- · New York D. Appleton · leaf 396
lopes with the Sextant and Artificial Horizon. Let A B, Fig. 551, be the surface of the ground, and A F a hori-zontal line. Mark two points equally distant from the eye. Meas-ure, by the preceding method, the angles ft and /?, which C A andC B make with the vertical C D. Then will half the… … the triangles C D E and A D F are similar, being right-angled andhaving the acute angles at D equal. Consequently, the angleD C E = D A F, which is the angle of the slope with the horizon.But D C E = i ()8 - i3), hence i {fi — 13) = the angle which theslope of the ground makes with the horizon. If…
Surveying
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