A treatise on land-surveying; comprising the theory developed from five elementary principles; and the practice with the chain alone, the compass, the transit, the theodolite, the plane table, &c. Illustrated by four hundred engravings, and a magnetic chart (1875)
Gillespie, W. M. (William Mitchell), 1816-1868 · New York, D. Appleton · leaf 152
pear from the accompanyingfigures, are sufficient. Case 1. When the first letters of thebearing are alike, (i. e. both N. or bothS.), and the last letters also ahke, (i. e.both E. or both W.), take the differenceof the bearmgs. Example. If AB bearsN. 30° E. and BC bears N. 10° E., theande of… … ritr- Fig. 170. Case 3. When the first letters aredifferent and the last letters alike, sub-tract the sum of the bearings from 180°.£x. If AB bears N. 30° E. and BCbears S. 40° E.; the angle CBBis 110°.
Surveying
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