Davies, Charles, 1798-1876 · New York, Cincinnati [etc.] American book company · leaf 373
ind the depth of a shaft at the point of intersectionwith the vein, and to find the lengthof a cross-cut that will again inter-sect the vein when the shaft iscontinued 250 ft. below the point ofits intersection, Fig. 193. Draw the horizontal line OL= 400 ft. Also ON, making theangle LOW = 60°. Then… … M A Fig. 193. OL : LP :: MN : PM\OL X PM MN = LP BY CONSTRUCTION. Draw OL = 400 ft.; also ON, making the angle LO]Sr=60° ;and LM to the point M, 250 ft. below the point of intersection P.From the scale take off LP and MNthe required distances. In the preceding problems the angle of 60° was employed…
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