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
and B Cbears S. 40° E., the angle C B B is 110°.Case 4. When both the first and lastletters are different, subtract the differ-ence of the bearings from 180°. Ex.: IfA B bears S. 30° W. and B 0 bears K70° E., the angle C B B is 140°. If the angles included between thecourses are desired, they will… … Fig. 156. N i VF-- -<*&- Fig. 15Y. — E
Surveying
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![An illustration from L'optique divisée en trois livres : ou, l'On démontre d'une maniere aisée tout ce qui regarde 1. la propagation & les proprietez de la lumiere. 2. La vision. 3. La figure & la disposition des verres qui servent à la perfefectionner [sic] (1682)](https://img.insideoutlibrary.com/img/200/ia-loptiquedivise00ango-329-36.webp)
