- 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 specialist employed in an advisory capacity. Normally, this person does not manage or direct any operation, and is at the service of the board rather than of the company's administrative and executive staff.
Industry:Mining
A specialized cementing material consisting of a portland-type cement, latex, a surfaceactive agent, and water, having a setting time equivalent to a neat portland-cement slurry. Latex cement shrinks less and is tougher, stronger, less permeable, and more durable than portland cement.
Industry:Mining
A specialized method of surveying a borehole, utilized when a magnetic compass cannot be used because of local magnetism. The instrument used is essentially a rigid tube, up to 30 ft (9.2 m) long, which is lowered into a borehole. The tube fits the borehole closely and contains a fine wire under tension. The difference between the arc of the tube, when bent at a crook in the borehole, and the chord of the wire is indicated by a stylus marking, which can be measured. The dip is read by etch tubes, and a directional orientation taken at the surface is carried down the hole by precise alignment of the tube and rods as they are lowered into the borehole.
Industry:Mining
A specially designed holder with enclosed fuse for connecting a conductor of a portable cable to the trolley system or other circuit supplying electric power to equipment in mines.
Industry:Mining
A specially designed theodolite used as a direct reading tacheometer.
Industry:Mining
A specially graduated arc attached to the vertical circle of an alidade or transit to simplify the computation of elevation differences for inclined stadia sights (without the use of vertical angles). The arc is so graduated that each division on the arc is equal to 100 (0.5 sin 2A), where A is the vertical angle. Named after William M. Beaman (1867- 1937), U.S. topographic engineer, who designed it in 1904.
Industry:Mining
A specially shaped piece of magnetic material forming an extension to a magnet; e.g., the salient poles of a generator or motor.
Industry:Mining
A special-type of transformer whose use in mines is limited to apparatus for starting induction motors of the squirrel cage type. The winding is a common one for primary and secondary, and the two circuits are electrically in contact with each other.
Industry:Mining
A specif. designed cable operated emergency stop switch for use with conveyors or conveying systems that are used with a pull cord running alongside or above the conveyor so that it may be reached from any point along the conveyor. Persons falling against or on top of the conveyor will pull on the cord and deactivate the conveyor movement.
Industry:Mining
