 | 1867 - 400 strani
...worked by hand-labor. The machine undercuts its " holes," or "kirves," with one man and one boy as attendants, and completes the work, with once going over, at the rate of fifteen yards per hour. Each machine uses thirty gallons of water per minute, at about three hundred pounds pressure, according... | |
 | 1867 - 400 strani
...worked by hand-labor. The machine undercuts its " holes," or "kirves," with one man and one boy as attendants, and completes the work, with once going over, at the rate of fifteen yards per hour. Each machine uses thirty gallons of water per minute, at about three hundred pounds pressure, according... | |
 | Andrew Ure - 1867 - 1144 strani
...mineral at once poing over, at the rate of thirteen yards per hour, and at any height from floor or rails, being suitable for either " dip " or " rise " workings, and is capable of working the thinnest seams. This apparatus is actuated by the pressure of water, which can be obtained... | |
 | Rossiter Worthington Raymond - 1870 - 834 strani
...the ordinary rails, about the mine, The machine undercuts "holes," or "kirves," with a man and boy as attendants, and completes the work with once going...can be obtained either from the stand pipes in the pit*, or from pumps attached to any existing engine, or from an engine and pumps specially made for... | |
 | William Phipps Blake - 1871 - 260 strani
...ordinary rails, about the mine, The machine undercuts u holes,77 or "kirves,77 with a man and boy as attendants, and completes the work with once going...from floor rails, being suitable for either "dip" or "rise77 workings, and is capable of cutting the thinnest seams. The pressure of water which actuates... | |
 | George Guillinane André - 1877 - 280 strani
...place, on the ordinary rails, about the mine. It undercuts " holes," or " kirves," with a man and boy as attendants, and completes the work with once going over, at the rate of 15 yards per hour, and at any angle and height from floor rails, being suitable for either " dip "... | |
 | Franklin Institute (Philadelphia, Pa.) - 1866 - 544 strani
...hand labor in the usual manner. The machine undercuts "holes," or " kirves," with a man and boy as attendants, and completes the work with once going...yards per hour, and at any angle and height from floor or rails, being suitable for either "dip" or "rise" workings, and is capable of cutting the thinnest... | |
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holes," or "kirves," with a man and boy as attendants, and completes the work with once going over, at the rate of fifteen yards per hour, and at any angle and height from floor rails, being suitable for either "dip" or "rise" workings, and is capable... 