- 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 ...
An endless-rope system in which the rope runs over the tubs or cars in the center of the rails. This system is generally adopted on undulating roads, where the tension in a heavily loaded rope would cause the rope to lift in swilleys and derail tubs. It is also generally adopted in highly inclined roads, as the lashing chain, often adopted with this method of haulage, obtains a good positive grip on the rope and is easier to detach than a clip. The rope is kept from rubbing on roof supports by holding-down pulleys: six or eight small pulleys are mounted in circular cheeks, allowing chains or clips to be accommodated in the spaces between the pulleys; or large diameter pulleys may be used, of the hat or mushroom shape, often starred to provide recesses for chains and clips. Similar large pulleys direct the rope around curves. Compare: undertub system.
Industry:Mining
An engine driven by steam or compressed air expanding in two or more stages.
Industry:Mining
An engine for forcing air into blast furnaces under pressure, commonly about 1 psi (6.9 kPa).
Industry:Mining
An engine located on a fixed foundation, as distinguished from a portable engine.
Industry:Mining
An engineer in charge of all electrical plant and associated labor at a mine or colliery. He or she has an assistant in charge of all the underground electrical equipment, operations, and labor. The electrical engineer is under the authority of the colliery manager.
Industry:Mining
An engineer with practical training and knowledge of all kinds of fuels and their combustion characteristics. In general, the engineer lacks the technical qualifications of the fuel technologist.
Industry:Mining
An English term for a very hard, smooth compact sandstone with conchoidal fracture that occurs in coal measures.
Industry:Mining
An English term for any fine-grained sandstone or limestone. Also spelled: poststone.
Industry:Mining
