. Railroad construction. Theory and practice. A textbook for the use of students in colleges and technical schools. By Walter Loring Webb . FiG. 18. gent distances are computable, and then Bb and aA are foundby subtracting h V and a V from the tangent distances. Thecurve may then be run from A, and the work may be checkedby noting whether the curve as run ends at £—previously lo-cated from h. b. When the point of curve (or point of tangency) is inacces-sible. At some distance {As, Fig. IS) an unobstructed line pn § 33. ALIGNMENT. 31 may be run parallel with A V. nv = jpy = As =z Ji vers a. ver
. Railroad construction. Theory and practice. A textbook for the use of students in colleges and technical schools. By Walter Loring Webb . FiG. 18. gent distances are computable, and then Bb and aA are foundby subtracting h V and a V from the tangent distances. Thecurve may then be run from A, and the work may be checkedby noting whether the curve as run ends at £—previously lo-cated from h. b. When the point of curve (or point of tangency) is inacces-sible. At some distance {As, Fig. IS) an unobstructed line pn § 33. ALIGNMENT. 31 may be run parallel with A V. nv = jpy = As =z Ji vers a. vers (Y = As ^ U. ns =j)s = It sin a. At ?/, which is at a distance jps back from the computed posi-tion of ^i, make an oifset sA to 7>>. Ilun i)ii parallel to thetano-ent. A tansjent to the curve at n makes an anoxic of « withnp. From n the curve is run in as usual. If the point of tangencj is obstructed, a similar process,somewhat reversed, may be used. /5 is that portion of A stillto be laid off when m is reached, tin =^ tl =^ It sin /?. iriz =tB = lx =1 B vers ft. c. When the central part of the curve is obstructed. a i
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