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 86
£) LJ (105.) Correction for Refraction. Formula [6] becomes sin^BAO-OOOOOlSie^)B° - %os. (BA C + 0.00015143/fc) + 0-00000002393t,A ^ SIMPLE ANGULAR LEVELLING. 67 Formula [7] becomes, diminishing B A C in both numer-ator and denominator by 0.08 of O, BC^^. sin. (Br A C + 0.00006913^)cos. (BA C +… … BC = & sin. i (a 4- P) [10.] cos. $(a + j3 + 0) Note.—Angle O, in minutes — 0.0001646&.Log. 0.0001646 = T.2164298. When zenith distances are ob-served, they are denoted by d and <5;.Then formula [10] becomes : cos. i(& — <5+ O) [10.] When O is very small, compared with the other…
Surveying
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