The theory and practice of surveying. Designed for the use of surveyors and engineers generally, but especially for the use of students in engineering (1886)
Johnson, J. B. (John Butler), 1850-1902 · New York, J. Wiley & sons · leaf 519
ome rsm{C-\-a) x — r sin a y = —: Tl. Substituting these values in (1) we haveC (3) ^ + ^P^-^)> • • • (4) sin 1 V where the correction to C is given in seconds of arc. The signs of the trigonometricalfunctions of the angk a mustbe carefully attended to, as it ismeasured continuously aroundto the… … Fig. 139 Fig. 140. C=C+{x-y). But since the angles x and y are very small, their sines areequal to their arcs, and we have, in seconds of arc, m x = b sin 1 // and y — n # sin i whence C = C + -: sin I mK~b (5) GEODETIC SURVEYING. 491 There are four cases corresponding to the four positions ofC, as…
Surveying
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