The theory and practice of surveying. Designed for the use of surveyors and engineers generally, but especially for the use of students in engineering (1886)
Johnson, J. B. (John Butler), 1850-1902 · New York, J. Wiley & sons · leaf 477
e end project-ing a quarter of an inch above the face of the stone. The U Sstone is marked thus, „. ^, and is placed three feet under ground. On this stone, and centred over the copper bolt, acast-iron pipe four inches in diameter and five feet long isplaced, and the dirt tamped in around it. The… … D in < .J hO« (t.O o Q u s GEODETIC SURVEYING. 447 MEASUREMENT OF THE BASE-LINE. 338. Methods.—The methods heretofore employed in meas-uring a base-Hne have depended on the degree of accuracyrequisite. If an accuracy of one in one milHon was desired, thenthe most elaborate primary apparatus has…
Surveying
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