- 行业: Mining
- Number of terms: 33118
- Number of blossaries: 0
- Company Profile:
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 ...
A ruler, with measurements sufficiently elongated to compensate for the heat expansion and contraction of a metal. Such rules are used in metal casting to correct dimensions to normal temperatures.
Industry:Mining
A safety appliance placed near the upper end of an inclined haulage road to stop a tram running wild down the incline. It consists of a heavy beam longer than the height of the roadway and is normally held up entirely at roof level, but is hinged at the lower end. In the event of a tram running away from above, a haulage hand can pull a rope that releases the upper end of the beam that drops and stops the tram.
Industry:Mining
A safety appliance that transfers the weight of the cage onto the guides if the winding rope breaks.
Industry:Mining
A safety device developed by the U.S. Bureau of Mines for sensing pressure changes, thereby warning in advance of bumps. The cells are embedded in the walls and roofs of coal mines.
Industry:Mining
A safety device equipped with slips or dogs to catch and grip casing if it is dropped while being lowered into or lifted from a borehole. Also miscalled tubing catcher; tubing hanger.
Industry:Mining
A safety device for derailing mine cars, usually installed on grades to protect miners working below.
Industry:Mining
A safety device on a mine hoist drum that applies a brake if the drum speed exceeds the set limit.
Industry:Mining
