. 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 . nces B B, D D, &c., each equal to b. 77. Proljlcm. Having run a curve A B [Jig. 28), to change thetangent point from A to C, in such a way that a curve of the same radiusmay strike a given point D. Solution. Measure the distance B D from the curve to D in a directionparallel to the tangent CE. T
. 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 . nces B B, D D, &c., each equal to b. 77. Proljlcm. Having run a curve A B [Jig. 28), to change thetangent point from A to C, in such a way that a curve of the same radiusmay strike a given point D. Solution. Measure the distance B D from the curve to D in a directionparallel to the tangent CE. This direction may be sometimes judgedof by the eye, or found by the compass. A still more accurate way isto make the angle DBE equal to the intersection angle at E, or totwice BAE, the total deflection angle from A to B; orif^ can beseen from B, the angle DBA may be made equal to BAE. Measure on the tangent (backward or forivard, as the case may be) a dislance A C — B D, and C will be the 7iew tangent point required. For. ifrflbe drawn equal and parallel to A F, we have Fi7 equal and par MISCELLANEOUS PROBLEMS. 5/ uUel to AC, and therefore equal and parallel to B D. Hence D H ==B AF= CH, and D /7 being equal to C H, a. curve of radios07 i^ from the tangent point C must pass through 78 ProblenB. Having run a curve A B (Jig. 29) of radius li , terminating in a tangent B D, to Jind the radius IV ordeflection angle D of a curve A C, that shall terminate in a given paralleltangent CE.
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectrailroadengineering
