. American engineer . ry operation. The difference between an increased hauling power of from 35to 40 per cent, and an increased tractive effort of 22^2 per cent,can only be attributed to the increased boiler capacity. If theequivalent heating surface (evaporating heating surface plus V/ztimes the superheater heating surface) is taken for the two loco-motives under comparison, and the same rate of evaporation isassumed for each, it will be seen that the Mikado is well over 50per cent, more powerful as a steam maker than the indicates that to make as good a record as it did.
. American engineer . ry operation. The difference between an increased hauling power of from 35to 40 per cent, and an increased tractive effort of 22^2 per cent,can only be attributed to the increased boiler capacity. If theequivalent heating surface (evaporating heating surface plus V/ztimes the superheater heating surface) is taken for the two loco-motives under comparison, and the same rate of evaporation isassumed for each, it will be seen that the Mikado is well over 50per cent, more powerful as a steam maker than the indicates that to make as good a record as it did. the con-solidation had to evaporate at a considerably higher rate persquare foot of heating surface in these tests. If a comparison ismade on the basis of theoretical maximum horsepower deliveredwith 700 ft. per minute piston speed, it will be seen that theMikado is about 40 per cent, more powerful than the consolida-tion and, when operating under these theoretical conditions, it 231 AMERICAN ENGINEER. Vol. 87, No. \<—30 A
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroa, bookyear1912
