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 22
is rcjiresentedby placing the sign — between two ratios ; as, a ■ b = c : d In the text and in the tables the foot has been taken as the unit gimeasure when no other unit is specified. FIELD-BOOK. CH/VPTER I. CIRCULAR CURVES. Article I. — Simple Cukaes 1. The railroad curves here considered are… … 2 CIRCULAR CURVES. ing the straight lines GA and B FT. The lengtli of sudi a curve ismeasured by cliords, each 100 feet long.* Tlius, if the chords AD^DE, E F, and FB are each 100 feet in length, the whole curve issaid to be 400 feet long. The straight lines GA and BH are alwaystangent to the curve…
Railroad engineering · Ferrovias
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