- 업종: 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 logarithmic grade scale devised by Johan A. Udden (1859-1932), U.S. geologist; it uses 1 mm as the reference point and progresses by the fixed ratio of 1:2 in the direction of decreasing size and of 2:1 in the direction of increasing size, such as 0.25, 0.5, 1, 2, 4.
Industry:Mining
A logarithmic grade scale for size classification of sediment particles, starting at 1 mm and using the ratio 1/2 in one direction (and 2 in the other), providing diameter limits to the size classes of 1,-1/2,-1/4, etc., and 1, 2, 4, etc.
Industry:Mining
A logarithmic grade scale for size classification of sediment particles, starting at 1 mm and using the ratio 1/2 in one direction (and 2 in the other), providing diameter limits to the size classes of 1,-1/2,-1/4, etc., and 1, 2, 4, etc.
Industry:Mining
A logarithmic transformation of the Wentworth grade scale in which the negative logarithm to the base 2 of the particle diameter (in millimeters) is substituted for the diameter value (Krumbein, 1934); it has integers for the class limits, increasing from -5 for 32 mm to +10 for 1/1,024 mm. The scale was developed specif. as a statistical device to permit the direct application of conventional statistical practices to sedimentary data.
Industry:Mining
A long and relatively thin deposit commonly formed at the intersection of two planes.
Industry:Mining
A long arm or extension attached to a charging machine for conveying and dumping scrap into an open-hearth furnace.
Industry:Mining
A long cone-shaped noncoring bit used in drilling blastholes and in wedging and reaming operations. When the nose of the bit is rounded and the overall shape resembles the silk end of a corncob, the bit often is called a corncob bit. Compare: bullnose bit
Industry:Mining
A long cylindrical nut, threaded internally with a right-hand thread at one end and a lefthand thread at the other, used to connect and tighten together the ends of two rods forming a brace or tie.
Industry:Mining
A long excavation in a slope that has a bank on one side, and is near original grade on the other.
Industry:Mining
A long iron bar attached to a forging, or a piece in process of forging, by which to swing and turn it.
Industry:Mining
