. Railroad construction. Theory and practice . Fig. Fig. 21. radius. If the radius is not to be changed, the point of curvemust be altered as follows: b. To move the forward tangent parallel to itself a distance a;,the radius being unchanged, (fig. 21.) In this case the whole 34 RAILROAD CONSTRUCTION §34. curve is moved bodily a distance 00 =AA ==VV =BB, andmoved parallel to the first tangent AV Bn X BB = =AA, (15) sin nBB sin J c. To change the direction of the forward tangent at the pointof tangency. (Fig- 22.) This problem involves a change (a) in the central angle and also requires an
. Railroad construction. Theory and practice . Fig. Fig. 21. radius. If the radius is not to be changed, the point of curvemust be altered as follows: b. To move the forward tangent parallel to itself a distance a;,the radius being unchanged, (fig. 21.) In this case the whole 34 RAILROAD CONSTRUCTION §34. curve is moved bodily a distance 00 =AA ==VV =BB, andmoved parallel to the first tangent AV Bn X BB = =AA, (15) sin nBB sin J c. To change the direction of the forward tangent at the pointof tangency. (Fig- 22.) This problem involves a change (a) in the central angle and also requires anew radius. An error in the deter-mination of the central angle fur-nishes an occasion for its use. Ry J J a, AVj and BV are known.
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