A treatise on surveying ; in which the theory and practice are fully explained (1860)
Alsop, Samuel · Philadelphia, E. C. & J. Biddle & co. · leaf 136
238. Third Method.—Set off AD (Fig.99) perpendicular to AB, and of any dis-tance. Bun DC perpendicular to DB. CD2Measure DC and CA: then CB = Fig. 99 CA or AB = AD2ACT … 3. When the point is the intersection of the line with another,and is inaccessible. 134 CHAIN SURVEYING. [Chap. IV. 239. First Method.—Let AB and CD (Fig. 100) be the lines, the distances of which to their intersection are required. Set off DF parallel to BA, and run CFA. Measure CD, CF, CA,andFD.…
Surveying
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