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 120
producedwhen necessary, plane ; for if it is a plane, the descent from A to B will be to the descent from Ai toBi, as the distance out at the first station is to the distance out at the second sta-tion, that is, c — h:ci — hi = d:di. K we had c = 9, A = 6, fi = 12, «! = 8,d = 24, and di = 27, the… … Then (Tab. X. 52) the solidities of the three pyramids arc B-AA,E,E = :^d X ^-Mc + ci) = |/(c?c + c/c,), B-EE,F,F = I A X ^ ^^ =llbh, B-A,B,F,E, =kl X h{dic, + ^bh,) = U(^iCi+^6A,). Their mm, or tlic solidity of the half-section, is ll{dc-\- d,c^ + dc, + hh + hhK). (1) Next, suppose that the…
Railroad engineering · Ferrovias
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