- 行业: Mining
- Number of terms: 33118
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- 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 technique used in trench blasting, etc., in which a lower concentration of charge is obtained by placing wooden pegs between every cartridge in the hole thus halving the concentration.
Industry:Mining
A technique used to measure only very low-speed air velocity. The release of smoke enables the fluid motion to be observed with the eye. If the smoke is timed over a measured distance along an airway of constant cross section then the velocity of flow can be determined. Usually a spot reading, that of maximum velocity, is obtained.
Industry:Mining
A technique utilizing a machine called a boring machine to bore large horizontal openings in rock or coal.
Industry:Mining
A telescope having an eyepiece fitted with a prism that reflects at 90 degrees .
Industry:Mining
A telescopic self-reading staff dividing into three sections, set one above the other when the staff is at its full extent of 14 ft (4.3 m). Graduations are marked in feet, tenths and hundredths of a foot, and the thickness of the horizontal lines is 0.01 ft (3.05 mm), alternately black and white.
Industry:Mining
A temperature scale based on the fusibility of a standard group of minerals. Used prior to the development of modern furnaces.
Industry:Mining
A temperature scale used in Belgium for measuring the environmental comfort in mines.
Industry:Mining
A temperature, usually just higher than the transformation range, employed in the heat treatment of steel to refine the structure, particularly the grain size.
Industry:Mining
A temporary independent wall separated from a slag-pocket wall by a thickness of sand for the purpose of easy slag removal and the protection of the permanent wall.
Industry:Mining
