. American engineer and railroad journal . ot of the grade at a speed of 30 miles per hour and passesthe summit at 5 miles per hour, then the total kinetic energywill equal a decrease in the grade of ft., making an ap-parent grade of per cent, instead of per cent. At slow speeds the resistance on a 1 per cent, grade is about20 + 5 = 25 lbs. per ton. The resistance on per cent, grade W V K = - K = - 2 g 2000 V» 2000 V 2 gVW ■ = V. t =■ 2sgFrom the diagram Fig. 3 the acceleration of one ton withforces from 5 to 500 lbs. at different velocities can be readilyobtaine
. American engineer and railroad journal . ot of the grade at a speed of 30 miles per hour and passesthe summit at 5 miles per hour, then the total kinetic energywill equal a decrease in the grade of ft., making an ap-parent grade of per cent, instead of per cent. At slow speeds the resistance on a 1 per cent, grade is about20 + 5 = 25 lbs. per ton. The resistance on per cent, grade W V K = - K = - 2 g 2000 V» 2000 V 2 gVW ■ = V. t =■ 2sgFrom the diagram Fig. 3 the acceleration of one ton withforces from 5 to 500 lbs. at different velocities can be readilyobtained. The distance run in feet is given on the horizontalline, the velocities in miles per hour on the vertical line, thetime on the straight radial lines and the force in pounds on thecurved radials. That the locomotive is likely to make remarkable progressin the immediate future is apparent to those who are in torn bwith the thought of leaders in this direction. Mr. S. M. Vau- clain at a recent meeting of the New England Railroad Club. Distance Fi at an average speed of miles is approximately + = lbs. per ton. Then, the percentage of decrease in re- 25 — sistance equals = 25 As the decrease in M. E. P. caused by higher piston speedwas 20 per cent., it is obvious that no increase in weight oftrain can be made by approaching this grade at the speedand tinder the conditions named, provided ample steam canbo generated by the boiler. If an up grade is preceded by adown grade considerable economy in the use of steam is ofcourse possible by utilizing the energy gained going down toassist in overcoming or partially overcoming the ascent on theother side. The space through which a body must pass in order to at-tain a given velocity when accelerated by a uniform force isequal to half the final velocity multiplied by the number ofseconds: Vt S S2 2 V* Run in Feet g. 3. made some remarks which we consider prophetic. He said:The improvement of the lo
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroadengineering
