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 101
triangle CDEadded to it. The triangle DEF is alsoto be added, and the triangle FGH de-ducted. To do this directly, it would benecessary to find the points of intersectionC and F. But this may be difficult, andcan be dispensed with by obtaining thedifference of each pair of triangles. Thedifference… … * 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…
Surveying
Internet Archive · California Digital Library · Public Domain Mark 1.0. Free to use for anything.
