. American engineer . ed on page 124 ofthe April, 1911, issue of the American Enn,inccr and RailroadJournal. The superheater locomotive is slightly larger than theoriginal engine and has a total weight of 237,000 lbs., of which139,500 lbs. is on drivers. The drivers are 80 in. in diameterand the cylinders are 23 in. x 26 in. The boiler pressure is 205lbs. The evaporative heating surface in the boiler is 2, sq. the firebox heating surface is 218 sq. ft., giving a total of2, sq. ft. The superheater of the fire tube type has a heatingsurface of 653 sq. ft. The locomotive had no d
. American engineer . ed on page 124 ofthe April, 1911, issue of the American Enn,inccr and RailroadJournal. The superheater locomotive is slightly larger than theoriginal engine and has a total weight of 237,000 lbs., of which139,500 lbs. is on drivers. The drivers are 80 in. in diameterand the cylinders are 23 in. x 26 in. The boiler pressure is 205lbs. The evaporative heating surface in the boiler is 2, sq. the firebox heating surface is 218 sq. ft., giving a total of2, sq. ft. The superheater of the fire tube type has a heatingsurface of 653 sq. ft. The locomotive had no difficulty in start-ing the train at Manhattan Transfer, Newark or North Phil-adelphia, the only stops made on the run. DESIGN OF COUNTERBALANCEWEIGHTS BY C. E. BRONSON In the following discussion the three forms of counterbalanceweights most generally used are considered, and to aid in check-ing of final results, the derivation of the various formulas isgiven in detail. It will be noted that the final formula, in each. Fa^q case, entirely eliminates the necessity for finding the center ofgravity of the counterbalance block. CRESCENT SHAPED COUNTERB.\L.\NCE. Let Fi = Area of the segment ABC. -Il = Distance of the center of gravity of the segment ABC from = Area of the segment = Distance of the center of gravity of the segment ABD from O,. 530 RAILWAY AGE GAZETTE. MECHANICAL EDITION. Vol. 87, No. 10. Fa := Area of the crescent ACBD. Xi ^ Distance of the center of gravity of the crescent ACBD from O,./ = Thickness of the counterbalance weight in = Weight per cubic inch of the material in the counter-balance := Weight to be countcrlialanced at the crank pin ra-dius the formula for center of gravity of a segment fromChurchs Mechanics, page 23, the values for Xi and x. are (AB) and X2 (AB)^ 12F. N = — F=.r: Substituting the values for x, and .v- in the last equation, i - r(AB)-l r(AB) -1 F3 .r, = F, ~ F J N I L 12Fi J L 12F, J
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroa, bookyear1912
