. Railroad construction. Theory and practice. A textbook for the use of students in colleges and technical schools. By Walter Loring Webb . Fm. 14. Fig. 15. (d -\- d) = D. The points ^ and a being determined on theground, aa may be computed and set off as before and the curvecontinued in full stations. A subchord at the end of the curvemay be located by 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), contains with one or more fullcliords (curvature of each, D)^ and ends
. Railroad construction. Theory and practice. A textbook for the use of students in colleges and technical schools. By Walter Loring Webb . Fm. 14. Fig. 15. (d -\- d) = D. The points ^ and a being determined on theground, aa may be computed and set off as before and the curvecontinued in full stations. A subchord at the end of the curvemay be located by 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), contains with one or more fullcliords (curvature of each, D)^ and ends with a subchord withcurvature d. The numerical work consists in computing firstAB^ then the various abscissae and ordinates. AB=2B sin^Zi. Aa = Aa! = c cos ^{J — d); Ah = Aa + ab = d cos \{A-d)-^00 cos \{A - 2d - D); Ac = Aa + ab + bc = c cos i(z/ - d) +100 cos {{/I - 2d - D) + 100cosi(z/-2(f-Z>);also -AB-Bc =z2Bs^J-c co%^{A - d). Kii) §32. ALIGNMENT. 29 aa=: aa = c sin |(z/ — d); ) bb = aa + mb= c sin 1{J - d)-\-100 siu \{^ - 2d - V); j cc = bb - nb = c sin 1{J - d)-{-100 siu |(z/ - M - D) )■ (12) -lOOsin i(J-2(r-Z>)
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