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
A pocket field manual of curve-laying formulas, survey tables and logarithms compiled by John Benjamin Henck for American railroad engineers, published by D. Appleton in New York in 1877. The 57 figures are line diagrams of arcs, chords, tangents and triangles with lettered points set against letterpress type, useful as spare geometric line art, measurement motifs and technical page textures.
