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 52
s well to use a target-rod for the turning-points,which are often distant and need most precision, and a speak-ing-rod for the intermediate points. Where one rod is used,the rodman should keep notes of the readings at the turning-points. (53.) Field-notes. The beginner may sketch the heightsand… … (54.) First Form of Field-book. In this, the names of thepoints, or Stations, whose heights are demanded, are placedin the first column ; and their heights, as finally ascertained, inreference to the first point, in the last column. The heightsabove the starting-point are marked +, and those below…
Surveying
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