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 87
ang, i (a + /3).Using zenith distances, this becomes: [11.] [11.] (107.) Reduction to the Summits of the Signals. Stations aand h cannot be seen from one another. Signals, Art. (240), areerected at each point, and from a the angle B a C = A isobserved; and from h the angle A h D = B. The heights… … The difference is in seconds. Usually, in such cases, zenith dis-tances are taken, and the observed an-gles are called A and Ar. The re-duced angles are 6 and 6. Then the formulas become h. sin. A - ., „. , ti. sin. A d= A + 7. „,_ -,,/, andd= a + &. sin. 1 ^.sin.r- [13.] The difference is in…
Surveying
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