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 498
or perfect precision, observe the oblique angle itself, and TEE PRACTICE. 483 also the angle of elevation or depression of each of the objects.With these data the oblique angle can be reduced to its horizontalprojection, either by descriptive geometry or more precisely by cal-culation, thus : Let A… … planes, A H A and B H B, and the oblique plane A H B, cut thissphere in arcs of great circles, Z A, Z B, and A B, thus form-ing a spherical triangle, A Z B, in which A B = li measures theobserved angle ; Z A = Z measures the zenith-distance of the pointA ; and Z B = Z measures the zenith-distance…
Surveying
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