- 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 bailer used in borehole-cementation work, provided with a valving device that empties the contents of the bailer (cement) at the bottom of a borehole.
Industry:Mining
A baked mixture of caustic soda and lime, used in the container or regenerator of selfcontained mine-rescue or oxygen-breathing apparatus to absorb the exhaled carbon dioxide. It has an advantage over straight caustic soda in that it does not cake, liquefy, or solidify when used.
Industry:Mining
A balance for weighing a substance in water to ascertain its specific gravity.
Industry:Mining
A balance-type gravity meter that is heavily damped in order to attenuate shipboard vertical accelerations. It consists of a mass at the end of a horizontal arm, supported by a torsion-spring rotational axis. The mass rises and falls with gravity variation, but is restored to near its null position by a horizontal reading spring, tensioned with a micrometer screw. The difference between actual beam position and null position gives indication of gravity value after the micrometer screw position has been taken into account.
Industry:Mining
A ball mill in which a vertical-grate diaphragm is placed near the discharge end. Between this perforated diaphragm and the end of the tube, there are arranged screens for sizing the material, oversize being returned for further grinding while undersize is discharged.
Industry:Mining
A ball, flapper, or clack-type valve placed at the bottom of a string of casing, through which cement is pumped. When pumping ceases, the valve closes and prevents return of cement into the casing.
Industry:Mining
A band containing or chiefly composed of mussellike shells, very valuable in the correlation of Coal Measures strata.
Industry:Mining
A bar having a fulcrum (pivot point) between the points where force is applied and where it is exerted.
Industry:Mining
