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 64
(68.) When the rod is a little too low, raise it alongside ofa stake, or the body, and put the top of the rod right;then measure down from the bottom of the rod, and add it toits length. DIFFICULTIES.Fig. 56. 45 … (69.) When the rod is a little too high, so that the line ofBight strikes the peg below the bottom of the rod, measuredown from the top of the peg, and put down the sight with acontrary sign to.what it would have had; i. e., if a back-sightmake it minus, and if a fore-sight make it plus. (70.) When…
Surveying
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