International Correspondence Schools · Scranton, Pa. : The Colliery engineer co. · leaf 248
- D cos f = R-r 1425. Problem III.—To avoid obstacles on a curve:Let it be required to run a curve A DEC between thepoints A and (7, and suppose an obstacle lies directly in thepath of the curve. The obstacle may be avoided by tracinga parallel curve FG HI, and from the stations on this par-allel… … Fig. 364. curve may be located. The process is as follows (seeFig. 304): Having determined either P. C. or P. T., erect a per-pendicular A F to the tangent A K. Now, in the curveF G HI it is evident that Avhile the angle A O C remainsconstant, the chords F G, G H, and HI shorten as weapproach the…
Railroad engineering
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