- 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 to assess the strength of a coal seam, its relative workability, and the influence of roof pressure. It consists of a steel rod of sectional area 1/4 in<sub>2</sub>(1.6 cm<sub>2</sub>) that is pushed into the coal, normal to the coal face, under the action of a light hydraulic ram. The ram is braced against lightweight props erected at the face. When in position, the penetrometer gives a graph of load against penetration at a particular point. Readings are taken at a number of points laterally and vertically along the face, and these can be correlated with the performance of plow-type machines. Thus, the probable performance of a machine in a seam can be estimated without the need for costly trials.
Industry:Mining
An instrument to detect very slight differences in color of solutions of different chemicals and thus measure the quantity of the chemical present. It consists of a light source, an optical prism for providing monochromatic light; i.e., light of a single wavelength only, and a device for measuring the intensity of the light beam after it has passed through the solution. Traces of aluminum in steel may be determined in this way.
Industry:Mining
An instrument to detect very slight differences in color of solutions of different chemicals and thus measure the quantity of the chemical present. It consists of a light source, an optical prism for providing monochromatic light; i.e., light of a single wavelength only, and a device for measuring the intensity of the light beam after it has passed through the solution. Traces of aluminum in steel may be determined in this way.
Industry:Mining
An instrument to determine the index of refraction of a liquid between two high-index glass prisms. Compare: refractometer
Industry:Mining
An instrument to determine the mechanical resonant frequency of a whole crystal or cut crystal plate. A slowly varying frequency is applied to the crystal from a signal generator, and the resonant frequency voltage developed across the crystal is measured with a voltmeter.
Industry:Mining
An instrument to determine the mechanical resonant frequency of a whole crystal or cut crystal plate. A slowly varying frequency is applied to the crystal from a signal generator, and the resonant frequency voltage developed across the crystal is measured with a voltmeter.
Industry:Mining
An instrument to determine the voltage difference between two points in the ground by the compensation method.
Industry:Mining
An instrument to determine the voltage difference between two points in the ground by the compensation method.
Industry:Mining
An instrument to facilitate observation of the essential elements of visual tasks in coal mines. It is a brightness meter in which the comparison field is illuminated by a cap lamp headpiece attached outside the instrument. No internal electrical circuit exists other than that which connects the photocell to the microammeter and the meter can therefore be used anywhere in a safety-lamp mine without restrictions.
Industry:Mining
An instrument to indicate when a long hole in a coal seam is deviating into the roof or floor. It may be used in underground gasification and pulsed-infusion shotfiring. It uses, among other things, a pellet of mercury to indicate the gradient by its position along a tube.
Industry:Mining
