- 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 ...
Used in main entries of coal mines and in shafts of metal mines in the United States. The sections have I-beams for caps and H-beams for posts or wall plates, the H-section giving equal stiffness in two directions at right angles to each other. Steel sets of various shapes are coming into wide use in deep European coal mines where pressures are so great that timber would not be satisfactory.
Industry:Mining
Used in open-hearth furnaces to increase the furnace temperature by preheating the fuel gas and air previous to their combustion in the furnace.
Industry:Mining
Used in quarrying to describe granite that has three sets of joints occurring at right angles to each other.
Industry:Mining
Used in some river tipples to let the coal down into the barges. Also known as weigh pans.
Industry:Mining
Used in the United States for obtaining additional information on the yields of coke, tar, and gas that can be expected in high-temperature practice. This is a vertical cylinder of 354 mild steel holding up to 2 hundredweight (91 kg) of coal and operated at temperatures up to 1,000 degrees C.
Industry:Mining
Used in widely different meanings in different manufacturing plants; the meaning of the term depends on the special process of cutting used. Thus, the faces of the major rhombohedron r 1011 are spoken of as the major face when BT wafers are cut directly from a faced mother crystal. Also applied to the prism faces that terminate in the faces of the major rhombohedron, etc.
Industry:Mining
Used primarily in television face-plate glass, in ceramic ferrites, and in pyrotechnics. The United States imports most of its celestite, the chief source of strontium, from Mexico and Germany.
Industry:Mining
Used to coat metals, machine parts, etc., to prevent corrosion. It usually is nondrying oil or grease, which coats the metal very well but is easily removed when desired.
Industry:Mining
Used to describe mineral when objects may be seen through it but without distinct outlines.
Industry:Mining
