- 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 ...
A form of sheet glass produced by rolling wire mesh into a ribbon of glass so that it acts as a reinforcement and holds the fragments together in the event of the sheet being fractured.
Industry:Mining
A form of strip packing that removes the localized high roof pressure from the vicinity of a roadway into a region in the goaf. It consists of two parallel packs adjacent to, and on each side of, the roadway, with the packs immediately at the roadsides built of such a width as to offer less resistance than wider and stronger packs (called buttress packs) more remote from the roadway. The principle of double packing was developed by D.W. Phillips in Great Britain. Compare: single packing
Industry:Mining
A form of transmission based on the principle that a magnetic field of force is produced whose strength is varied so as to transmit a torque of corresponding magnitude. With a system of this kind, control of any particular operation is effected through the agency of the magnetorque clutch, while the motor runs continuously at constant speed.
Industry:Mining
A form of tube mill used in the cement industry, in which the pulverizing is done by long pieces of hardened steel shafting.
Industry:Mining
A form of vertical chute in which the chute is divided into independent sections that can be raised or lowered on a track arrangement. It is flexible and can be lowered to the bottom of the car, giving a solid stream of coal from loading pocket to car.
Industry:Mining
A form of wad; a soft, earthy manganese dioxide, containing up to about 32% cobalt oxide. Sometimes referred to as earthy cobalt.
Industry:Mining
A form of wad; a soft, earthy manganese dioxide, containing up to about 32% cobalt oxide. Sometimes referred to as earthy cobalt.
Industry:Mining
A form of wad; a soft, earthy manganese dioxide, containing up to about 32% cobalt oxide. Sometimes referred to as earthy cobalt.
Industry:Mining
A form of worm conveyor having two noncontinuous spirals that form paddles; the shafts are contrarotating and the spirals opposite.
Industry:Mining
