. The miller, millwright and millfurnisher. wall plate, and on a bearing bar fastened in the fire brick. They are generally slightly the lowest at the rear end, to facilitate stoking. As regards distance from the under side of the boiler, it should be regulated strictly by the kind of fuel. Many a time a new lot of good coal has been unjustly condemned as poor for steaming purposes, when it was simply un- adapted for the grate, or the fire-box too high or too low—generally too high. For hard anthracite, 18 inches are sufficient fire-box height, 24 inches for semi-bituminous, and 30 inches for
. The miller, millwright and millfurnisher. wall plate, and on a bearing bar fastened in the fire brick. They are generally slightly the lowest at the rear end, to facilitate stoking. As regards distance from the under side of the boiler, it should be regulated strictly by the kind of fuel. Many a time a new lot of good coal has been unjustly condemned as poor for steaming purposes, when it was simply un- adapted for the grate, or the fire-box too high or too low—generally too high. For hard anthracite, 18 inches are sufficient fire-box height, 24 inches for semi-bituminous, and 30 inches for bituminous coal proper. In a 12-foot boiler, 48 inches in diameter, good usage sanctions the following dimensions and distances : of centre line from ground 80 Height of lower end of grate from ground, . Length of grate, net, ....... Distance from top of grate to bottom of boiler, .Thickness of bridge wall and mud-drum wall (if solid),From centre of bridge wall to centre of mud-drum wall, vanes 55 varies 18 64 136 SMOKE CONSUMERS. 137 Inches. Thickness of back cross wall \ .^P 3 ( bottom, ...... 19 Distance of centre of rear wall from centre of back cross wall, . 29 Thickness of rear wall, ......... 13 Height of rear cross wall, . ... , . . 51 Height of mud-drum wall, ........ varies Height of bridge wall, 44 Depth foundation walls below ground level, ..... 30 Thickness of side walls, if solid, ........ 13 Side walls, out to out, 83 Side walls, in to in, . . . . . 57 The boiler should be slightly inclined (say one inch in ten feet) towardthe blow-off pipe at the back end, and this should be so placed as to drain
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectflourmi, bookyear1882
