A treatise on surveying ; in which the theory and practice are fully explained (1860)
Alsop, Samuel · Philadelphia, E. C. & J. Biddle & co. · leaf 133
of its position being rectified. 130 CHAIN SURVEYING. [Chap. IV. C—PARALLELS. Problem 1.— Through a given point to run a parallel to a given accessible line. 227. This may be done by Arts. Fig. 91.97, 98, or 99, or thtfs:— * »- 7F 2 Let AB (Fig. 91) be the line, and \;{ C the point. From C to any… … Froblem 2.—To draw a parallel to an inaccessible line, twopoints of which are visible. 228. Let AB (Fig. 92) be thestraight line, and C the givenpoint. Run the line CD per-pendicular to AB, by Art. 220;and from C set out CE perpen-dicular to CD. It will be theparallel required. Problem 3.— To draw…
Surveying
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