A treatise on surveying ; in which the theory and practice are fully explained (1860)
Alsop, Samuel · Philadelphia, E. C. & J. Biddle & co. · leaf 129
en the point and line are both accessible. 217. The methods in Arts. 91,92,93, may be adopted in this case;or in AB (Fig. 85) take any pointD, and measure CD. Make DE =DC, and measure CE. Fig. 85. *-^ C Then take EF = EC2 -, and F a • f / / \ \ / / . \ / / » \ / \ \ 1 / \ » / \l 2.EDwill be the… … (b.) If Hie point is remote or inaccessible 218. First Method.—In AB(Fig. 86) take any convenient» points A and D; erect theperpendicular FDE, makingFD = DE; range out AE,and EC cutting AB in H, andFH intersecting AE in G:then GBC will be perpen-dicular to AB. For, by construction, the triangles…
Surveying
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