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A treatise on land-surveying; comprising the theory developed from five elementary principles; and the practice with the chain alone, the compass, the transit, the theodolite, the plane table, &c. Illustrated by four hundred engravings, and a magnetic chart (1875)

Gillespie, W. M. (William Mitchell), 1816-1868 · New York, D. Appleton · leaf 102

An illustration from A treatise on land-surveying; comprising the theory developed from five elementary principles; and the practice with the chain alone, the compass, the transit, the theodolite, the plane table, &c. Illustrated by four hundred engravings, and a magnetic chart, 1875, leaf 102
* For, making the triangle Bmn = ABC, then mtiEG = En X h {^^ + ^^^(DE — AB) X i EB ; and so with the other pair of triangles. CHAP, IV.] Diagonals, Tie-lines and Perpendiculars. «5 (136) Roads. A winding Road may also be surveyed thas, as18 shown in Fig. 85; straight lines being measured in the… … their changes in direction determined by tie-lines, tying one line tothe preceding one prolonged, as explained in Chapter II, of thisPart, and points in the road-fences, on each side of these straightlines, being determined by offsets. A Riyer may also be supposed to be represented by the…

Surveying

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