Davies, Charles, 1798-1876 · New York, Cincinnati [etc.] American book company · leaf 61
ave twoangles and the included side, to find the side BA. The lines BD and CE should each equal BC,if. possible, tofacilitate computation, and the angle at A should not be lessthan 10°. n Thied Method.—Let AC he the distance required. Lay off the right angle CAB, and measure AB, any convenient… … Fig. 40. SEC. I.] MEASUREMENT OF DISTANCES. 55 in practice, the distance AC \s usually a portion of a longer line,so that the line CAD is well marked by stakes or pins, before ABis measured. 80. To prolong a line beyond an obstacle.—If the obstaclecan be seen over, the surveyor should send an…
Surveying
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