. American engineer . ea of 56,5 sq. ft. was adopted. This boiler would not allowthe application of cylinders larger than 28 in. x 28 in., and inorder to obtain the desired tractive effort to handle 14-cartrains, the driving wheel diameter was reduced to 63 in. Inview of the class of traffic and conditions of service this com-bination was thoroughly satisfactory. These engines are notintended for sustained high speed such as would ordinarily bedemanded of a large Pacific type, and this size of wheel allows increase in the grate area of about 14 per cent, and the reductionof the steam pressure
. American engineer . ea of 56,5 sq. ft. was adopted. This boiler would not allowthe application of cylinders larger than 28 in. x 28 in., and inorder to obtain the desired tractive effort to handle 14-cartrains, the driving wheel diameter was reduced to 63 in. Inview of the class of traffic and conditions of service this com-bination was thoroughly satisfactory. These engines are notintended for sustained high speed such as would ordinarily bedemanded of a large Pacific type, and this size of wheel allows increase in the grate area of about 14 per cent, and the reductionof the steam pressure from 180 to 170 lbs,, there is very littledifference in the size. The combustion chamber adds 51 sq. the heating surface of the firebox, but the heating surfaceof the tubes and flues has been reduced by 56 sq. ft. If it isassumed that the heating surface in the firebox is six times asvaluable as that in the tubes, and that the heating surface of thearch tubes is ten times as valuable as that in the boiler tubes,. New Type of Main Rod End and Brass. it will be found that on the basis of heating surface, the moun-tain type boiler is about 5 per cent, larger than that used on thePacific type. This, taken in connection with a 14 per cent, in-crease in the grate area and a reduction of 10 lbs. per square inchin the steam pressure, will give a considerable net increase inthis boiler. The size of the superheater is about the same inboth locomotives. The design throughout embodies the latest improved practiceof the builders. The engines have a screw reverse gear; out-side steam pipes; extended piston rods; latest improved. out-
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroa, bookyear1912
