Field-book for railroad engineers. Containing formulas for laying out curves, determining frog angles, levelling, calculating earth-work, etc., etc., together with tables of radii, ordinates deflections, long chords, magnetic variation, logarithms, logarithmic and natural sines, tangents, etc., etc (1877)
Henck, John Benjamin, 1816-1903 · New York : D. Appleton · leaf 125
e preceding formula? are still applicable ; but as this applica-tion introduces minus quantities into the calculation, the followingmethod, similar in principle, is preferable. 125. Problem* Given the ividlhs of an excavation at the road-bed 6 106 EARTH-WORK. AF = w and Ai F, = Wi {Jig. 53), the… … Solution. Suppose, first, that the surface is divided into two triangles by the diagonal B A^. Through B draw the plane BA^F,,dividing that part of the section which is in excavation into two pyra-mids B-AAiFiF and B-AiB^ F^, the solidities of which are B - A Ai F, F = I h X k ^ {lo + ivi) = ll{ioh…
Railroad engineering · Ferrovias
Internet Archive · Public Domain Mark 1.0. Free to use for anything.
