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 83
A C : AB. Therefore, AB ^ -^ . If from C, determined as before, the angle A C B be laid off equalto yl CB, we have, without calculation, A B = AB. Third Method. Measure a line A D (fig. 35) in an oblique directionfrom the bank, and fix its middle point C From any convenientpoint E in the line of A… … now a point G, that shall be at the same time in the line of CB andof D F, and measure G D. Then the triangles ABC and D G C sreequal, and G D is equal to the required distance A B. As the object of drawing E Fis to obtain a line parallel to A B, thisline may be dispensed with, if by any other…
Railroad engineering · Ferrovias
Internet Archive · Public Domain Mark 1.0. Free to use for anything.
