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 361
tached to a finely divided vertical circle. TheFlG-S39- radius may also be found without this, thus : Bringthe bubble to center, andsight to a divided rod.Raise or lower one end ofthe level, and again sight tothe rod. Call the differenceof the readings 7i, the dis-tance of the rod d, and thespace… … moved S.whence r = 0-02 50 feet. The sensibility of an air-bubble level equals that of a plumb-line level having a plumb-line of the same length as the radius ofcurvature. 506. Block-Level. If this is marked by the maker, and the bub-ble does not come to the center, whenturned end for end, plane or…
Surveying
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