A treatise on surveying ; in which the theory and practice are fully explained (1860)
Alsop, Samuel · Philadelphia, E. C. & J. Biddle & co. · leaf 187
ious methods of determining the lengths ofinaccessible lines are merely applications of the rules ofTrigonometry, and might, therefore, be applied by the stu-dent without further instruction. There is, however,always a choice in the method to be employed: the following are therefore given, that all… … Fig. 135. 314. First Method.—Select anystation C, (Fig. 134.) Measure BC,and take the angles BAC and bABC. Thence we can calculate AB. 315. Second Method. — MeasureCA and CB (Fig. 134) and theangle ACB; whence, having twosides and the included angle, ABmay be determined. 316. Third Method.— Where…
Surveying
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