. American engineer . t. 6 in. inlength and a total evaporative heating surface of 4,068 sq. ft. is considered, there seems little doubt but lluit this design ofboiler will have an equal or greater capacity than the fact that a larger increase in the amount of firebox heatingsurface does not result from the much larger mud ring is ex-plained by the practical elimination of the throat of the boilerand the raising of the grate level throughout. The depth ofthe firebox is about 73^4 in. at the front and 64 in. at the backand the distance from the grate level to the crown sheet at thefr
. American engineer . t. 6 in. inlength and a total evaporative heating surface of 4,068 sq. ft. is considered, there seems little doubt but lluit this design ofboiler will have an equal or greater capacity than the fact that a larger increase in the amount of firebox heatingsurface does not result from the much larger mud ring is ex-plained by the practical elimination of the throat of the boilerand the raising of the grate level throughout. The depth ofthe firebox is about 73^4 in. at the front and 64 in. at the backand the distance from the grate level to the crown sheet at thefront tnd of the grate is l)Ut 66 in. The brick wall is set 36 in. from the back tluc sheet and is13 in. thick. The top of the wall is 20 in. from the crown sheetat the center. There are si.\ air inlets discharging underneatha deflecting brick arranged as shown in one of the grate area of this firebox is sq. ft. The ratio of fireboxheating surface to .grate area is , while on the other locomo-. Superheater Switch Engine -nWn Gaines Combustion Clnamber; iliinois Central. The grate area is 70 sq. ft., and the firebox is 120% in. long by84 in. wide. On locomotive Xo. 1600. which is fitted with aGaines combustion chamber, the firebox is 198 in. long by 90in. wide and the tubes have been shortened to 18 ft. 3 in. Thishas resulted in a loss of 421 sq. ft. of heating surface in thetubes which is slightly offset, so far as actual area is concerned,by a gain of 19 sq. ft. in the firebox, leaving a net loss of 402 tives, in spite of the fact that they are considerably deeper, theratio is but 3 36. The grate is of the usual finger type, rockingin four sections and with a dump grate at the rear. It will be seen that the advantages offered by the Gainesarrangement in connection with the location of the firebox inrelation to the driving wheels have proved valuable in this caseand the front mud ring is located almost directly over the rear
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroa, bookyear1912
