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 401
called an an-gle of elevation, and the angle B A Can angle of depression. Theformer angle may be called positive,and the latter negative. The angle B A Z or B A Z is calledthe zenith-distance of the object. Itis the complement of the former an-gle—i. e., = 90° — that angle taken with its proper… … METHODS AND INSTRUMENTS. 387 and complicated operations, as avoiding the ambiguity of the othermode of notation. 573. Instruments. All contain a divided circle, or arc, placedvertically, and a level or plumb line. By these is measured thedesired vertical angle made by the inclined line with either…
Surveying
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