Wentworth, G. A. (George Albert), 1835-1906 · Boston, Ginn & company · leaf 212
hese bearings according to the following rules,as suggested by Fig. 10 : 1. If the first letters of the bearings are alike, and also thelast letters, find the difference of the bearings. 2. If the first letters are alike, and the last letters unlike,add the bearings. 3. If the first letters are… … Fig. 10 Measurement of Vertical Angles. A vertical angle is anangle the sides of which are in a vertical plane. If one sideof a vertical angle is horizontal and the other ascends, theangle is called an angle of elevation; if one side is horizontaland the other descends, the angle is called an angle…
Trigonometry · Surveying · Navigation
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