. The Street railway journal . 20 40 tX) Tims - Soi-onds FIG. 6. 40 (SO eo 40 60 20T/me -Jecands-FIG. 7 In case only one speed time curve is to be plotted, it isunnecessary to plot a complete set as shown in Figs. 2 to 7The value of A can be found at any instant as the sum ofall the forces due to grade, curve and motor tractive effortat that instant. This method is described in Electric Rail-ways, Ashe & Keiley, pp. 37-46. However, when a num-ber of speed time curves are to be plotted for one equip- preliminary determinations, such as choiceof motor and of gear ratio. After the mo-tor and gear
. The Street railway journal . 20 40 tX) Tims - Soi-onds FIG. 6. 40 (SO eo 40 60 20T/me -Jecands-FIG. 7 In case only one speed time curve is to be plotted, it isunnecessary to plot a complete set as shown in Figs. 2 to 7The value of A can be found at any instant as the sum ofall the forces due to grade, curve and motor tractive effortat that instant. This method is described in Electric Rail-ways, Ashe & Keiley, pp. 37-46. However, when a num-ber of speed time curves are to be plotted for one equip- preliminary determinations, such as choiceof motor and of gear ratio. After the mo-tor and gear ratio are determined a com-plete set of curves Figs. 2 to 7 should beplotted. If possible this should be donebefore the final location on the ground ismade. The curves are invaluable in de-termining such questions as— 1. What is the most economical gradefor the approaches to an overhead cross-ing? 2. What will be the speed at a certainpoint where a curve is necessary, thus de-termining the sharpest safe curve that canbe used? 3. How long can a certain d
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
