A treatise on levelling, topography, and higher surveying (1876)
Gillespie, W. M. (William Mitchell), 1816-1868, Staley, Cady, b. 1840, ed · New York, D. Appleton and company · leaf 73
ose given in L. S. for inac-cessible distances. Combinations of measurements not in the same verticalplane may also be used, as will be shown in Chapter III. (88.) Vertical Angles. The vertical angles measured maybe those made—either with a levelline, or with a vertical line—bythe line passing from… … METHODS AND INSTRUMENTS. 55 called the zenith distance of the object. It is the complementof the former angle, i. e., = 90°— that angle taken with itsproper algebraic sign. An angle of elevation, BAC = 10°,would be a zenith distance of 80°. An angle of depression,BA C = — 10°, would be a zenith…
Surveying
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