- Отрасли: 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 flameproof motor-starting contactor for use with coal-face machinery. The essential features are a flameproof casing divided into two separate compartments, the smaller of which contains a hand-operated isolating switch and the main bus bars. The isolating switch is interlocked with the cover of the main compartment so that it cannot be removed unless the switch is in the off position; or it may be fitted with contacts enabling the mechanism to be earthed before work is undertaken on it.
Industry:Mining
A flameproof, air-filled transformer of a size up to 300 kV.A, which can be used inby near the face in safety-lamp mines. A nitrogen-filled transformer for mining use is the latest trend.
Industry:Mining
A flask used to separate gold and silver, such as by quartation, in assaying procedures.
Industry:Mining
A flask used to separate gold and silver, such as by quartation, in assaying procedures.
Industry:Mining
A flat diamond, sometimes with several rows of facets around its edge; used for covering very small portraits.
Industry:Mining
A flat or curved refractory roof over a furnace at the point of fuel entrance that promotes ignition by reflection of heat.
Industry:Mining
A flat or curved refractory roof over a furnace to promote combustion by reflection of heat.
Industry:Mining
