The theory and practice of surveying. Designed for the use of surveyors and engineers generally, but especially for the use of students in engineering (1886)
Johnson, J. B. (John Butler), 1850-1902 · New York, J. Wiley & sons · leaf 378
the vertical angle and horizontal distanceto the mouth of the tunnel. From the results obtained calculate the depth at which thetunnel will intersect the vein, then from this depth and theangle of the dip, calculate the horizontal distance of the veinfrom a vertical line through the instrument… … Fig. 98. Example.—A certain vein has a course of N. 45° E. and its pitch is N.45° W. with a dip of 15° from a vertical line. The horizontal distance to themouth of a cross-cut tunnel from the apex of the vein is 200 feet S. 45° E. andthe vertical angle is — 25. At what distance from the mouth will…
Surveying
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