Davies, Charles, 1798-1876 · New York, Cincinnati [etc.] American book company · leaf 371
364 ELEME]STS OF SURVETIJs^G. [book X. of shaft = 500 feet, and the angle GFD = 60°, to find the length of a cross-cut UG from* the bottom of the shaft to intersect the vein; also the distance from the outcrop to the point of intersection. Find the horizontaldistance from the outcropF, at which a… … Fig. 191. FII = 588.5tan 60 339.78. If a depression or elevation from the outcrop occurs at the point,it must be subtracted from or added to the depth of the shaft;for example, if there is a depression of 50 ft. it will only be neces-sary to sink 538.5 ft. to the point of intersection. The…
Surveying
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