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 86
on A (7, it is obvi-ous that the deflections from both tangents will be of the same lengthfor corresponding points. The angles to be laid off from B C must, Df course, be equal to BCD. The points or stations thus found, though corresponding to equaldistances on the tangents, are not themselves… … Solution. Bisect A B in D, draw CD, and its middle point E willoe a point on the curve (§ 84, L). D E is the first middle oi^.nate,and its length may be measured or calculated. To the point E drawt>-.e chords A E and BE, lay off the second middle ordinates G K andHL, each equal to \DE{^ 84,…
Railroad engineering · Ferrovias
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