. The Street railway journal . of thefirst class, 11 lbs. of water per pound of first-class steam coal;and in water-tube boilers, 12 lbs. and above under best con-ditions. The only difference in the building in of the sheet flues in awater-tube boiler, such as Babcock & Wilcox and any horizon-tally-set, return-flue tubular boiler, is that in the return-fluetubular-boiler furnace the last section of the flue, which con- ducts air from the crescent-shaped section in the rear end wallfrom rear to bridge, is triangular in shape, and lies in thecorner of the combustion chamber. In water-tube boiler
. The Street railway journal . of thefirst class, 11 lbs. of water per pound of first-class steam coal;and in water-tube boilers, 12 lbs. and above under best con-ditions. The only difference in the building in of the sheet flues in awater-tube boiler, such as Babcock & Wilcox and any horizon-tally-set, return-flue tubular boiler, is that in the return-fluetubular-boiler furnace the last section of the flue, which con- ducts air from the crescent-shaped section in the rear end wallfrom rear to bridge, is triangular in shape, and lies in thecorner of the combustion chamber. In water-tube boilers thecrescent-shaped piece in rear end wall continues its lower hornfurther, and the same corresponding section of pipe conductingthe air from this crescent to bridge is rectangular, lying whollyin the side walls as the others do. When it reaches in the sidewall opposite the hollow bridge it turns out of the side walls oncither side into the hollow of the bridge. The only other distinction between the two in building in is. FIG. 2.—FULL SIDE ELEVATION OF WATER TUBE BOILER, SHOW-ING CONSTRUCTION OF SMOKE-CONSUMING FURNACE. that the round return-flue tubular boiler furnace has a roundbridge, and the checker-work of firebricks is built up imme-diately behind this bridge, and not on it. The water-tubeboilers named have a straight, transverse bridge, and thechecker-work is built up immediately behind it. In all furnaces of this type a water pit is used in the ash pitunder the grates, because the falling pieces of hot coal andashes which wall in this water and the radiation from the gratefire evaporate it into a very heavy wet steam. This steam iscarried up to the coal burning on the grate bars, and by passingthrough this burning coal is disassociated into hydrogen andoxygen, thus helping to produce better combustion and a hotterfire. Several of these furnaces have already been installed, notablyin the Crown Woolen Mills, Marcellus, N. Y., and the BannaCotton & Oil Mills, Goldville
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
