Surveying ; a manual of practical instruction in the art of plane surveying, including plotting, leveling, triangulation, line running, cross-sectioning, traversing, and other details of field work (1910)
American School of Correspondence, Phillips, Alfred Edward, 1863- [from old catalog] · Chicago, American school of correspondence · leaf 44
then applied to it, the vertical circlebeing turned till the bubble is in the center. The angle of slopeis then read, or better still, the slope ratio is read from the verticalcircle. This operation is repeated at every change of slope, thedistances being either paced or measured with a taj)e. For…
Surveying
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