Davies, Charles, 1798-1876 · New York, Cincinnati [etc.] American book company · leaf 355
rks in the field-book. 387. The distances between the stations are now measuredwith great care. A chain should not be used in these measure-ments ; a light steel tape is much better. The points corres-ponding to the ends of the tape are marked by chalk lines on therock, or in some other convenient… … 388. When distances between stations are measured along theslope, the angle of elevation or depression of the course must bedetermined—and may be determined as follows: SEC. III.] UNDERGROUN^D TRAVERSING. 34^ Let the nail on staff at A (Fig. 181) be at the same distanceabove the ground at A that…
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