- 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 ...
An instrument that detects leaks in water, oil, gas, steam, and air lines by amplifying the sound produced by the escaping fluid.
Industry:Mining
An instrument that gives a continuous record of the methane concentration over a period of time.
Industry:Mining
An instrument that is used to measure atmospheric pressure. It may be either a mercury barometer or an aneroid barometer.
Industry:Mining
An instrument that makes use of electrically heated filaments that burn methane and measure the heat output by resistance pyrometry. One or more filaments form the arms of a Wheatstone bridge circuit, the out-of-balance current being a function of the methane percentage.
Industry:Mining
An instrument that measures and provides readout of the flow of air in a pipe or hose in cubic meters per second.
Industry:Mining
An instrument that measures angles between crystal faces by reflecting a beam of light from successive faces as the crystal is rotated.
Industry:Mining
An instrument that measures conductivity of a water sample. This conductivity when compared with that of a sample of known salinity can be converted to an expression of salinity for the unknown.
Industry:Mining
An instrument that measures high temperature, e.g., of molten lavas, by electrical or optical means.
Industry:Mining
An instrument that measures the capability of a fluid to transmit light; esp. one that measures the turbidity of water by determining the percent transmission of a light beam.
Industry:Mining
An instrument that measures the Earth's magnetic field, depending on the magnetic moment of the atom. Hydrogen atoms are generally used, and these can be in a compound such as water. Each hydrogen atom can be viewed as a tiny electromagnet whose strength and direction are determined by the revolution of the electron of the atom about its nucleus. In a magnetic field, atoms of hydrogen have a tendency to align themselves in opposition to the field. If the direction of the field is suddenly changed, there will be a moment pulling the atoms toward the new direction. But each atom is a midget gyroscope, and instead of shifting directly to the new field direction, it will precess about this direction. The frequency of this precession will be a function only of the strength of the magnetic field.
Industry:Mining
