Reports of the Inspectors of Mines of the anthracite and bituminous coal regions of Pennsylvania, for the year .. . oing sohe performs work equal to 109,760 foot-pounds, or an expenditure in thethree hours at the rate of 36,586 foot-pounds per hour,t. e., in the actualloading of the coal. In the other mine to load the same quantity offourteen tons of coal into the car 4 8 high, the sum of 146,347 foot-pounds of work must be performed, an increase of 36,587 foot-pounds,being nearly one hours work. Thus it is shown that if a laborer canload fourteen tons of coal into the lowest car in three hour
Reports of the Inspectors of Mines of the anthracite and bituminous coal regions of Pennsylvania, for the year .. . oing sohe performs work equal to 109,760 foot-pounds, or an expenditure in thethree hours at the rate of 36,586 foot-pounds per hour,t. e., in the actualloading of the coal. In the other mine to load the same quantity offourteen tons of coal into the car 4 8 high, the sum of 146,347 foot-pounds of work must be performed, an increase of 36,587 foot-pounds,being nearly one hours work. Thus it is shown that if a laborer canload fourteen tons of coal into the lowest car in three hours, it wouldrequire four hours to load the same quantity into the high car, workingat the same rate. In a mine employing one hundred laborers and taking that eighthours out of a day of ten hours is occupied in actual work, the one hun-dred laborers in the mine where the low car is used produce as much asone hundred and twelve in the other, and this is an item of value andworth saving. Besides, a man can raise heavy lumps of coal to a heightof three and a half feet with less fatigue in proportion to the quantity. k
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectcoalmin, bookyear1889
