. Railroad construction : theory and practice : a textbook for the use of students in colleges and technical schools . 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 x,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 A VBn X BB=^- r^AA. (15) sin nBB sin A c. To change the direction of the forward tangent at the pointof tangency. (Fig. 22.) T

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. Railroad construction : theory and practice : a textbook for the use of students in colleges and technical schools . 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 x,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 A VBn X BB=^- r^AA. (15) sin nBB sin A 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 , A J a J AVf and BV are = J-a.

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