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 71
rbisects the target. Then send the rod along the line, anddrive pegs to such heights that when the rod is held on themthe cross-hair will bisect the target. A stake may be drivenat the extreme point to the height of the target. A line of uniformgrade or slope is not astraight line. Callingthe globe… … PART-II. INDIRECT LEYELLIN a CHAPTEE I. METHODS AND INSTRUMENTS (87.) Vertical Surveying. Levelling may be named Yer-tioal Surveying, or Up-and-down Surveying / Land Sur-veying being Horizontal Surveying, or Right-and-left andFore-and-aft Surveying. All the methods of determining the position of a…
Surveying
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