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 32
at its highest point, as indi-cated by the middle of the bubble. (22.) Sensibility. This is estimated by the distance whichthe bubble moves for any change of inclination. It is directlyproportional to the radius of curvature of the tube. To de-termine the radius, proceed thus: Let S = length of the… … S may be found by trial, the level being attached to afinely-divided vertical cir-cle. The radius may alsobe found without this,thus : Bring the bubble tocentre, and sight to a di-vided rod. Eaise or lowerone end of the level, andagain sight to rod. Callthe difference of the read-ings A, the…
Surveying
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