- 行业: Mining
- Number of terms: 33118
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The U.S. Bureau of Mines (USBM) was the primary United States Government agency conducting scientific research and disseminating information on the extraction, processing, use, and conservation of mineral resources.
Founded on May 16, 1910, through the Organic Act (Public Law 179), USBM's missions ...
The periods of acceleration, uniform speed, retardation, and rest. The deeper the shaft, the greater is the ratio of the time of full-speed hoisting to the total hoisting cycle. For shallow shafts there may be very little time at full speed, retardation beginning almost at the end of the accelerating period.
Industry:Mining
The peripheral portion or that part of a bit crown, roller bit cutter, or any cutting edge of a bit in contact with the walls of a borehole while drilling.
Industry:Mining
The person employed at the bottom of a shaft or slope to put loaded cars on, and take empty cars off the cage.
Industry:Mining
The person in charge of the shaft and cage or skip at the surface of a colliery; the person at the surface who operates the signals from the cage or skip to the winding engineman.
Industry:Mining
The person who hooks or unhooks the hoisting rope to or from the buckets.
Industry:Mining
The phenomenon involved in the operation of a thermocouple. Named for Thomas Seebeck, the German scientist, who first observed the phenomenon in 1822.
Industry:Mining
