Davies, Charles, 1798-1876 · New York, Cincinnati [etc.] American book company · leaf 374
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 forconvenience of construction, but the principles would l)e true forany other angle. 407. Figures 194, 195, 196, represent plan, longitudinaland… … 368 ELEMENTS OF SURYETING. [book X. In opening mines it is considered good practice to follow thevein for a considerable distance in depth, to be fully satisfied ofits continuity, before sinking a vertical shaft for deep working. Should the vein be vertical, however, the prospecting shaftmay be…
Surveying
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