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 406
AOC, thecentral angle, which is measured by the arc AC, or h.The length of the arc subtending one minute 2 7T X 20912405 = 6083 feet. 360 X 60 Then for any arc, Jc, the angle O in minutesh 6083 = 0-00016438* and the angle CAC (in minutes) = 0-000082193*. Adding this to the observed angle, B A C,… … 583. Correction for Refraction. The effect of refraction causesthe angle actually observed to be, not CAB, but C A B, whichwill be designated by a°. Forsmall distances, B and B sensiblycoincide. The correction for re-fraction may be made in twoways, as for curvature. To correct the result ly…
Surveying
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