A treatise on surveying, comprising the theory and the practice ; (1887)
Gillespie, W. M. (William Mitchell), 1816-1868, Staley, Cady, 1840- [from old catalog] ed · New York, D. Appleton and company · leaf 413
398 LEVELING. operations for finding it by the various methods already givenmay be combined with the observation of vertical angles, thus: Fig. 433. … At A measure the vertical angle of elevation, B A C. Also meas-ure the horizontal angle, CAD, to some point, D, and measurehorizontally the distance, AD. At D measure the horizontal an-gle, ADC. Then, sin. ADO AC = AD BC = AD sin. A C Dsin. ADC, tang. B ACsin. A C D BC = AC. tang. B A C. [20.] 593.…
Surveying
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