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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 380

An illustration from 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, leaf 380 — th the vein. 272. Required, the Direction and Distance from theBreast of a Tunnel to a Shaft, and the Depth at which itwill cut the Shaft.—Make a survey of the tunnel and repro-duce it upon the surface, as in the first example. Calculatethe depth of the breast below the surface. Set up the instru-… … /■

Surveying

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