. Electric railway journal . FIG. 7- -DIAGRAM SHOWING HANDY METHOD FOR DETERMININGRADIUS OF TRACK a pantograph I would be zero, and values of D for thiscase would be different. If the pantograph is placedover a truck the trolley wire should follow the centerline of the track. Fig. 6 shows how the wire should behung at the entrance to a curve. The frog should beso placed that the line given by its angle a is tangentto the curve described by the wire, which is offset bythe values found as explained above. To determine R, the track radius at any point, asimple method can be used as shown in Fig.
. Electric railway journal . FIG. 7- -DIAGRAM SHOWING HANDY METHOD FOR DETERMININGRADIUS OF TRACK a pantograph I would be zero, and values of D for thiscase would be different. If the pantograph is placedover a truck the trolley wire should follow the centerline of the track. Fig. 6 shows how the wire should behung at the entrance to a curve. The frog should beso placed that the line given by its angle a is tangentto the curve described by the wire, which is offset bythe values found as explained above. To determine R, the track radius at any point, asimple method can be used as shown in Fig. 7. Thedistance x between the center line of the track and themiddle point of a 20-ft. chord is first found by takingthe mean of similar distances as a and b determined »D = B — \/B3—-D — R R — vr- —tttj-. 10090804- 70 S so c 50w 40 U<V ? 301 15 « l2 v 18 « !* !£ 10§ 9 M by chords of equal length measured on the two 50 , x r 2 R = If x is very small as compared with R, the secondterm in the above formula may be omitted. If it isexpressed in inches, R is approximately 600/x. The trolley wire can be made to follow closely itstheoretically correct curve by close spacing of thehangers, which is especially necessary on curves of
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Keywords: ., bookcentury1900, bookdecade1900, bookpublishernewyorkmcgrawhillp
