- المجال: 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 ...
An appliance for loosening coal by means of high-pressure water and oil. It consists of a round, stainless steel bar with small telescopic rams acting on a steel liner in a shot hole. The bar is connected to a hand- or power-operated pump placed near the face. The highpressure liquid from the pump causes the rams and liner to exert a pressure sufficient to loosen or break down the coal. It is a safe method of coal breaking without the use of explosives. It has not, however, made the progress originally anticipated.
Industry:Mining
An appliance for measuring changes in vertical height, usually at the coalface. It consists of a telescopic strut between the roof and floor and carries a pen that records the movement on a clockwork-driven chart.
Industry:Mining
An appliance for measuring strain that may be employed in roof-control research. It makes use of the change in electrical resistance of a thin wire when stretched under the influence of strata strain.
Industry:Mining
An appliance for measuring strain that may be employed in roof-control research. It makes use of the change in electrical resistance of a thin wire when stretched under the influence of strata strain.
Industry:Mining
An appliance for measuring strain; often used in roof control investigations. It employs a micrometer dial gage actuated through a lever giving initial magnification of the movement.
Industry:Mining
An appliance for measuring viscosity. It consists of a copper funnel, about 30 cm long with a 15-cm diameter at the top, that has a 10-mesh screen over half its diameter to remove debris and a 6-mm-diameter exit tube at the bottom through which the rate of flow is timed. It takes 26 s for a quart of clean water to flow through and correspondingly longer for muds of greater viscosity. Gel strength is measured by comparing the rate of flow of freshly agitated mud with that of mud that has been allowed to remain quiescent for 10 min.
Industry:Mining
An appliance for producing, by means of currents of air, a series of sized products from a finely crushed mineral (e.g., for the paint or abrasive industries).
Industry:Mining
An appliance for the continuous weighing of coal or other material in transit on a belt conveyor.
Industry:Mining
An appliance for the dry collection of dust during drilling in rock. The rock chippings, dust, and air are sucked from the borehole through a rubber hose to a drum-type container with filters. The drum is discharged and the filters renewed periodically. In some of the newer types, the dust is extracted through the hollow drill rods.
Industry:Mining
An appliance for the storage of coal from the face conveyors during peaks of production or during a stoppage of the outby transport. It may consist of a length of conveyor chain running in high-capacity pans arranged under the delivery end of the gate conveyor. When the trunk conveyor cannot handle the coal from the gate conveyor, the bunker chain is slowly drawn back carrying about 1 st (0.9 t) of coal per yard of chain. The bunker is later discharged by reversing the process.
Industry:Mining
