A treatise on surveying ; in which the theory and practice are fully explained (1860)
Alsop, Samuel · Philadelphia, E. C. & J. Biddle & co. · leaf 289
20 chains, and BC = 15 chains, to divide it into twoparts ADE and DECB, which shall be to each other as 2to 3, by a line parallel to BC. What is the distance on ACto the division line ? Ans. 12.65 chains. CASE 4. 401. By a line running a given course. Construction.—Divide AB in G, (Eig.189,) so… … d B F x B For ACG : CGB :: AG : GB, and, by the lemma, ADE= ACG. ADE : DECB :: AG : GB. Calculation. In ACF find AF. Then AD = ^AG . AF; or say, As the rectangle of the sines of D and E is to the rectangle ofthe sines of B and C, so is the square of BC to a fourthterm. Then, if the ratio of the…
Surveying
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
