. The Street railway journal . which is required to make that particular schedule with any stations because of curvatures, the time-speed curves willshow the proper amount of coasting and braking, and then anynew acceleration before coming to a braking point for stops. * * * Q. Are you able to state what is the maximum electrical powerper ton now in use and how it compares with steam equipment?A. Well, in Boston we are using 9 hp to 10 hp per ton, because thecars there weigh when loaded about 36 tons, and there is 300 hpper car, but this does not afifect the control in the slightest. Byputting
. The Street railway journal . which is required to make that particular schedule with any stations because of curvatures, the time-speed curves willshow the proper amount of coasting and braking, and then anynew acceleration before coming to a braking point for stops. * * * Q. Are you able to state what is the maximum electrical powerper ton now in use and how it compares with steam equipment?A. Well, in Boston we are using 9 hp to 10 hp per ton, because thecars there weigh when loaded about 36 tons, and there is 300 hpper car, but this does not afifect the control in the slightest. Byputting a motor truck in place of a trail truck, the power wouldbe run up to about 14 hp per ton, and it would be possible to raisethat by a difference in mode of construction to 21 hp or 22 hp perton. There is no difficulty in handling any number of these units,no matter how they are distributed throughout the train. InBoston every car is equipped with motors and operated on themultiple-unit plan, the same as proposed for this given weight, whether i, 10 or 100 tons. I would look amongthe records of all existing motors to find if there was a motorhaving the general capacity of the motor indicated by this the-oretical investigation, and if I found it, then I would takeup the details of that motor. If not, I should simply requiresuch a motor to be built, and any electrical manufacturing com-pany will build such a motor. The probabilities are that amotor would be found in stock. Then I would draw aseries of time speed curves and torque and current curves of thismotor. I would determine these in the first place for different I would select the proper gearing, and construct a series ofcurves for the performance of that motor under different condi-tions. Those conditions would be, first, on a dead level; and thenon Yi per cent, i per cent, and V/i percent up grades, etc., and alsothe performance on a down grade, varying in per cents. Withsuch curves the operation of the m
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Keywords: ., bookcentury1800, bookdecade1880, bookidstreetrailwa, bookyear1884
