- 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 employing a directed beam of light used to examine etched wafers for twinning.
Industry:Mining
An instrument for analyzing flue gases. Although outside its normal field of application, it may be used for analyzing mine air.
Industry:Mining
An instrument for analyzing gases and vapors from liquids with boiling points up to 300 degrees C. The gas chromatograph often arranges the molecules of a gas in increasing size, and as each group emerges from the column, a detector measures the quantity of each. Since all the molecules of one type emerge after the same time interval, it is possible to identify quickly the constituents present.
Industry:Mining
An instrument for ascertaining the weight or the density of air or other gases.
Industry:Mining
An instrument for assessing climatic conditions in mines, such as wet- and dry-bulb temperatures, air velocity, barometric pressure, and radiation. The field of usefulness of the instrument is limited to mines where the workers are normally sweating freely and wear few clothes.
Industry:Mining
An instrument for describing large arcs. It consists of a beam of wood or metal carrying two beam heads, adjustable for position along the beam, and serving as the marking points of the compass.
Industry:Mining
An instrument for describing large arcs. It consists of a beam of wood or metal carrying two beam heads, adjustable for position along the beam, and serving as the marking points of the compass.
Industry:Mining
An instrument for detecting and measuring nuclear radiation; analogous to the cloud chamber. It consists of numerous electrically charged metal plates mounted in a parallel array, the spaces between the plates being occupied by inert gas. Ionizing radiation causes sparks to jump between the plates along its path through the chamber.
Industry:Mining
An instrument for detecting methane in mine air. It contains an electric battery that sustains a small electric glow light. As soon as a certain percentage of methane enters the workings, a tiny explosion occurs in the fuse head, where a fine wire filament is melted and starts a bell ringing continuously.
Industry:Mining
