Wentworth, G. A. (George Albert), 1835-1906 · Boston, Ginn & company · leaf 278
dings of the rod are ordinarily taken to the nearesttenth of a foot, except on bench marks and points calledturning points, where they are taken to thousandths of a foot. A turning point is a point on which the last sight is takenjust before changing the position of the level, and the firstsight… … no. 55 Field Work. To explain the method of obtaining the fieldnotes necessary for making a profile, let 0, 1, 2, 3, • • •, 11(Fig. 55) represent a portion of a section to be leveled andplotted. Establish a bench mark at or near the beginning ofthe line, measure the horizontal length of the…
Trigonometry · Surveying · Navigation
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