Davies, Charles, 1798-1876 · New York, Cincinnati [etc.] American book company · leaf 364
of the peg;if the selected station is on a rock, and a peg can not be driven,the cross-lines are marked in the rock to note the station. Thefront edge of the vertical bar is placed at the point marked onone peg and the end of the horizontal bar, extended if necessary,to the point marked on the… … Fig. 185. The reading on the horizontal bar will give the true horizontaldistance between the two stations, and the reading on thevertical bar will give their difference of level. 398. A better method than repeating the traverse on thesurface will appear from a consideration of the diagram, Eig.…
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