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 63
approaching a long ascent or descent, makethese compensations in advance. In levelling over a line of stakes already set, as on a rail-road, at every 100 ft., if the line of sight strikes not quite upto one, drive a peg as high as you can see it, and make it; aturning-point, noting it peg in the… … (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
Surveying
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
