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 84
rly, with wind, ba-rometer, temperature, etc.;but is usually taken, as anaverage, BB^ 0.16 C C. * Subtracting this from the value of B C, in formula [2], itbecomes BC^L tang. BA C + 0.00000002&2. [4.] To correct the observed angle. Subtract from it the angleB A B, which is about 0.16 of the… … aJTC &V Q6 LEVELLING, TOPOGRAPHY, AND HIGHER SURVEYING. For these distances we cannot consider the angle at C aright angle. The triangle ABC gives sin. BAGB C = h. —=—tj— •sin. B To find the angle B, we have, in the triangle BAO, B = 180° -(O + BAO), B = 180° - (O + 90° + B AC), B = 90° - (0 +…
Surveying
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