A treatise on surveying, comprising the theory and the practice ; (1887)
Gillespie, W. M. (William Mitchell), 1816-1868, Staley, Cady, 1840- [from old catalog] ed · New York, D. Appleton and company · leaf 533
rses and distances of thegalleries, or their equivalents (Art. 764). The chief difficulty is to get a starting-point, and to determinethe direction of the first line. 761. When the Mine is entered by an Adit (Fig. 564). Setthe transit at the entrance, and get the direction of the adit, j and… … 762. When the Mine is entered by a Shaft. Get the magneticbearing of the first underground line, at the bottom of the shaft,with great care. Bring up the end of the line through the shaftby a plumb-line, and set the compass over this point. Set out a LOCATING NEW LINES. 519 line with the same…
Surveying
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