- Industry: 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 for testing the magnetic content of ores and for checking the efficiency of wet magnetic separators recovering magnetite and ferrosilicon in heavy-media processes.
Industry:Mining
An instrument for the measurement of the density of an image produced by light, X-rays, gamma rays, etc., on a photographic plate; used in some dust-sampling instruments.
Industry:Mining
An instrument giving a continuous record of the methane concentration in mine air. It uses a small flame burning butane in a gauze-protected enclosure. Instead of observing the cap, thermocouples are used to show the increased temperature above the flame, and the resulting signal is displayed on a recording milliammeter. The instrument runs for at least a week and is accurate to about 0.05% methane.
Industry:Mining
An instrument giving qualitative indications of anomalies in the magnetic field.
Industry:Mining
An instrument in which heat radiated from the hot body is focused, by means of a concave mirror, on a small central hole behind which a small thermocouple is placed in front of two small, inclined mirrors. The instrument is sighted onto the hot body and focused by rotating a screw until the lower and upper halves of the image coincide; the electromotive force generated by the thermocouple is indicated on a galvanometer. The instrument, once focused, gives continuous readings and may be connected to a recording indicator.
Industry:Mining
An instrument in which the acceleration of gravity is determined by measuring the swinging period of a mass that is supported on top of a spring.
Industry:Mining
An instrument in which the telescope sights vertically (upward or downward); used chiefly for centering a theodolite on a tower exactly over a station mark on the ground. It may be used for any vertical sight.
Industry:Mining
An instrument of limited sensitivity for measuring changes in the total intensity of the magnetic field.
Industry:Mining
An instrument of the steady deflection type where speed is read off directly from the scale of the instrument. This is most useful for measuring low speeds, since it permits a spot reading. This instrument does not integrate and is used extensively in work connected with the ventilation of building interiors and to a fair extent underground.
Industry:Mining
