Bulletin . ,000 cubicfeet of air per minute EXHAUHT BTKAM Vfi \ li:i \ I \ I i\ 171 w ill show mi aCCUmU lated deficitof wateramounting to2,000,000 gallons per months duringthe year t bequantityi)\ water taken intothe mine l>\ the airis in excess of i battaken out. Thisperiod is approximately from themiddle of June tothe middle of August, gHence it appears £that artificial means Zof watering are neces- 1sary during the |greater part of the avear—from August £15 to June 15. Dur-ing that time at least I2,000,000 gallons of |water must be sup- |plied. This figure, |of course, is b
Bulletin . ,000 cubicfeet of air per minute EXHAUHT BTKAM Vfi \ li:i \ I \ I i\ 171 w ill show mi aCCUmU lated deficitof wateramounting to2,000,000 gallons per months duringthe year t bequantityi)\ water taken intothe mine l>\ the airis in excess of i battaken out. Thisperiod is approximately from themiddle of June tothe middle of August, gHence it appears £that artificial means Zof watering are neces- 1sary during the |greater part of the avear—from August £15 to June 15. Dur-ing that time at least I2,000,000 gallons of |water must be sup- |plied. This figure, |of course, is based sonly on one years £observations, and |may be greater or 3less from year to year, 2yet the indications 3are that theobserva- °tions in the secondyear will practicallycoincide with thoseof the first year. In supplying thedeficiency of water,the aim should be tocover the maximumdeficiency for anyperiod rather thanthe minimum at anyone time. Duringthe year from June Gnlloni p«r 100,000 cubic 172 THE EXPL0SIB1LITY OF COAL DUST. 1, 1908, to June 1, 190.), the minimum average temperature forone day was 21° and the minimum average contentof watervaporper 100,000 cubic feet of air was equivalent to gallons of lowest weekly average temperature was 34° witli a concurrentaverage humidity of 3 gallons, and the lowest monthly averagetemperature was 39° with 3 gallons of water. As the deficiencyand excess of water in a mine are more or less cumulative, itwould he safe to take the weekly average as a basis for calculating thequantity of heat and moisture to be supplied by artificial means. According to the records, the temperature of the return air currentduring the coldest weather of the year was 55°, and it carried of water per 100,000 cubic feet. If, then, sufficient heat wereconstantly supplied to raise the intake temperature from 34° to 55°,and sufficient water to raise the quantity from 3 to gallons per100,000 cubic feet (the rate p
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectminesandmineralresou
