Field-book for railroad engineers : containing formulae 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. / by John B. Henck.
Field-book for railroad engineers : containing formulae 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. / by John B. Henck.