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 134
. Xow,if local attraction at C causes the needle to point in the directionof S W, 10° to the left of its proper direction, B C will bear X.50° E., and CD X. 70° E., and the difference of these bearings—i. e., the angle of deflection—will be the same as before. 188. Angles between Courses. To… … Case 1. When the first letters of the bearing are alike (i. e., both 1ST. or both S.), and the last letters also alike (i. e., both E. or both W.), take the difference of the bearings. Example: If A B bears N. 30° E., and B C bears N. 10° E., the angle of deflection C B B is 20°. Case 2. When the…
Surveying
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