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
/■ … tained and add it to or subtract it from the depth of thebreast below the surface. The result is the depth of tunnelbelow the mouth of the shaft. Survey the shaft to a point whose vertical depth is equal 350 SURVEYING. to the depth of the tunnel level. . Calculate the horizontaldistance and…
Surveying
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