- 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 clockwork photographic apparatus that records clinometer and compass readings on sensitized paper. It is used during borehole surveying.
Industry:Mining
A closed conduit that is gradually contracted to a throat causing a reduction of pressure head by which the velocity through the throat may be determined. The contraction is generally followed, but not necessarily so, by gradual enlargement to original size. Piezometers connected to the pipe above the contracting section and at the throat indicate the drop in the pressure head, which is an index of flow.
Industry:Mining
A closed contour, inside of which the ground or geologic structure is at a lower elevation than that outside, and distinguished on a map from other contour lines by hachures marked on the downslope or downdip side.
Industry:Mining
A closed form consisting of orthorhombic, trigonal, tetragonal, or hexagonal positive and negative pyramids.
Industry:Mining
A closed crystal form, each face of which is a scalene triangle; trigonal scalenohedra have 12 such faces; tetragonal have 8. Adjective: scalenohedral. See: dogtooth spar.
Industry:Mining
A closed form consisting of orthorhombic, trigonal, tetragonal, or hexagonal positive and negative pyramids.
Industry:Mining
A closed groove between two rolls, formed by a collar on one roll and fitting between collars on another.
Industry:Mining
