. Railroad construction. Theory and practice. A textbook for the use of students in colleges and technical schools . when the curve begins at an even station. If we con-sider (in Fig. 14) the curve produced back to z, the chord za —2X100 cos iZ), Aa = 100 cos JD, and AA=^am=zn = 100 sin off A A perpendicular to the tangent and Aa parallel tothe tangent. AA=aa=66=cc, etc. = 100 sin JZ). Set offaa perpendicular to a^A. Produce Aa^ until ab=A^a, thusdetermining h. Succeeding points of the curve may thus bedetermined indefinitely. Suppose the curve begins with a subchord. As beforera = Am
. Railroad construction. Theory and practice. A textbook for the use of students in colleges and technical schools . when the curve begins at an even station. If we con-sider (in Fig. 14) the curve produced back to z, the chord za —2X100 cos iZ), Aa = 100 cos JD, and AA=^am=zn = 100 sin off A A perpendicular to the tangent and Aa parallel tothe tangent. AA=aa=66=cc, etc. = 100 sin JZ). Set offaa perpendicular to a^A. Produce Aa^ until ab=A^a, thusdetermining h. Succeeding points of the curve may thus bedetermined indefinitely. Suppose the curve begins with a subchord. As beforera = Am =c^ cos J<i, and rA =am^ =c^ sin ^d\ Also sz = An^ =ccosK, and %A=2yi,=csinid, in which ((f+c?)=Z).The points z and a being determined on the ground, aa maybe computed and set off as before and the curve continued in § 30. ALIGNMENT. 29 full stations. A subchord at the end of the curve may be locatedby a similar process. 30. Curve location by offsets from the long chord. (Fig. 16.)Consider at once the general case in which the curve commenceswith a subchord (curvature, d)j continues with one or more full.
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