. Railroad construction, theory and practice; a text-book for the use of students in colleges and technical schools . 72 RAILROAD CONSTRUCTION. §63. also frequently used in locating new parallel tracks and modify-ing old tracks. a. To move the forward tangent parallel to itself a distance «,the point of curve (a.) remaining fixed. (Fig. 25.) FF=-T sin/iFy~sin J* *AV=AV + VV\The triangle BmB is isosceles and Bm=Bm. Br x B-R=00=mB = vers BmB vers A (13) /. R=R + X vers A (14) The solution is very similar in case the tangent is moved in-ward to VB\ Note that this method necessarily changes the. F

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. Railroad construction, theory and practice; a text-book for the use of students in colleges and technical schools . 72 RAILROAD CONSTRUCTION. §63. also frequently used in locating new parallel tracks and modify-ing old tracks. a. To move the forward tangent parallel to itself a distance «,the point of curve (a.) remaining fixed. (Fig. 25.) FF=-T sin/iFy~sin J* *AV=AV + VV\The triangle BmB is isosceles and Bm=Bm. Br x B-R=00=mB = vers BmB vers A (13) /. R=R + X vers A (14) The solution is very similar in case the tangent is moved in-ward to VB\ Note that this method necessarily changes the. Fig. 25.

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