The Civil engineer and architect's journal, scientific and railway gazette (1839)
London : [William Laxton] · leaf 360
eat a distance a B above the point B (fig. 1), for a cutting. B A =K; A a = A; e c =; a c := A, the reading of the staff when stationedat c. Then we have, Bc = Bo — ac = BA-(-Aa — ac=K4-A — A, and thelength of the horizontal line through c = cc = a:=::rX Bc = r{K + h — h) = r{K + h) — rh = aa — rh… … Fig. 1,—Cutting. In the case of an embankment (fig. 2), JT = r X B c = r{K — h + h) — r (K - A) + r 7. = rBa-|-j-ft := a(^ \ rK (2) Hence, whether there be cutting or embankment, we must deter-mine the half-width (aa^ at the level of the line of collimation ; andin making repeated trials, we have…
Architecture · Civil engineering · Science
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