. Cassier's magazine . the millis warmed sufficiently by this in mild,warm weather. If 800 horse-powerbe assumed to be let loose in a millthis represents about 2,000,000 B. per hour, or the equivalent of 150pounds of fair coal, or, say, about 4tons per week wholly turned intoheat in the mill itself. About sixteenmillion B. T. U. of heat are hourlydischarged into the hot well from theengines, and it does seem strange thatuse is not made of this waste heat towarm air to be discharged, suitablymoistened, for heating and ventilat-ing purposes. The total heat putinto a 70,000 spindle mill amou
. Cassier's magazine . the millis warmed sufficiently by this in mild,warm weather. If 800 horse-powerbe assumed to be let loose in a millthis represents about 2,000,000 B. per hour, or the equivalent of 150pounds of fair coal, or, say, about 4tons per week wholly turned intoheat in the mill itself. About sixteenmillion B. T. U. of heat are hourlydischarged into the hot well from theengines, and it does seem strange thatuse is not made of this waste heat towarm air to be discharged, suitablymoistened, for heating and ventilat-ing purposes. The total heat putinto a 70,000 spindle mill amounts attimes to about seven millions B. per hour, so far as can be approxi-mated from a knowledge of the fric-tional heat and the coal burned purelyfor mill warming purposes. Thusfive, or at most, say, six million unitswould be required of the sixteen mil-lion units that goes to waste in thehot well. A standard mill couldsave as much as 12 tons per weekby a rational system of warming by DRIVING OF COTTON MILLS 303. 3°4 CASSIERS MAGAZINE
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