Davies, Charles, 1798-1876 · New York, Cincinnati [etc.] American book company · leaf 360
be, pegged out on the surface.If, however, the first course is within the tunnel, as in examplegiven in Art. 391, the first course must be connected with thfsurface. There are two principal methods of making the con-nection : 394. FIRST METHOD. A straight-edge, AB^is mounted on twotrestles, and… … 354 ELEMENTS OF SURVEYING. [book X. the bottom of the shaft; the transit being at the second station,K, and the telescope turned in the direction of the first station,D, the straight-edge is moved by an assistant until both are seenin line from K, their plane then passes through the first…
Surveying
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