. A study of the various experiments for the determination of the resistance of electric cars and trains . lation between train res-istance and speed for passenger trains of all weights andrunning at all speeds. These tests were conducted while thetrains were in actual service,on the South Side F-levatedRailroad of Chicago. The coasting method of determiningtrain resistance was used in these tests. assumedthat if the retarding force consisted of friction alone,thespeed-time curve for coasting would be a straight the dip which occurred in the actual speed-time curvesobtained
. A study of the various experiments for the determination of the resistance of electric cars and trains . lation between train res-istance and speed for passenger trains of all weights andrunning at all speeds. These tests were conducted while thetrains were in actual service,on the South Side F-levatedRailroad of Chicago. The coasting method of determiningtrain resistance was used in these tests. assumedthat if the retarding force consisted of friction alone,thespeed-time curve for coasting would be a straight the dip which occurred in the actual speed-time curvesobtained,he concluded that the air resistance varied directlywith the speed. He also found that the total train resistancevaried with the weight of the train. His results as plottedgive a series of straight line curves,through a common pointon the axis of MY. The ordinate of this point gave thefirst term of his formula; * 3(0,^3^1 where R is the train resistance in pounds per ton. S is the speed in miles per hour. T is the weight of the train in short tons. Trqin ftc-sfs tattfic - /b. Jb*r f*n Ft J 111 EUGENE DIETZGEN CHICAGO. 1?.. The expression by which MS is multiplied is proportionalto the tangents of the angles made by the lines developedfor different weights of trains,and is the characteristicof a rectangular hyperbola. The term is an intercepton the axis of y; 14 is the constant product of X andMY with the intersection of the asymptotes as origin;and35 is an intercept on the axis of X. latermodified this formula to the form + S(+ ~£ ).The actual curves from which the formula was derived areshown in Jr. conducted a number of tests for theGeneral Electric Company in March 1900,on the Buffalo andRockport Railway. In these tests a train of three non-vest-ibule passenger coaches and a baggage car was drawn by a37 ton electric locomotive,geared to give a maximum speedof 55 miles per hour to 60 miles per hour at average linevolt
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Keywords: ., bookcentury1900, bookdecade1910, booksubjecttheses, bookyear1912
