- 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 making a borehole survey; i.e., to determine if, and in what direction, a borehole has deviated off the true vertical plane.
Industry:Mining
An instrument for making physical observations upon standing waves. It may be used, e.g., to measure velocity, wavelength, absorption, or impedance.
Industry:Mining
An instrument for measuring acoustic-radiation pressure by determining the unidirectional steady-state force resulting from reflection or absorption of a sound wave at its boundaries.
Industry:Mining
An instrument for measuring air velocity. It consists of a small fan from 3 to 6 in (7.6 to 15.2 cm) in diameter that is rotated by the air current. By simple gearing, the number of revolutions of the fan is recorded on dials. It is held in the mine airway for the exact number of minutes (N), the instrument being moved steadily over the entire area. The difference between the initial and the final readings on the dials, divided by N, gives the velocity of the air in feet per minute. Instruments are available for velocities from near zero to 6,000 ft/min (1.83 km/min), also with extension and remote control handles.
Industry:Mining
An instrument for measuring any slight rotation of a bridge support under load.
Industry:Mining
An instrument for measuring atmospheric pressure, built first by Lucien Vidie in about 1843. Basically, variation in pressure with changes in altitude is determined by the movements of the elastic top of a metallic box from which the air has been partly exhausted. Used generally in measuring altitude.
Industry:Mining
An instrument for measuring changes in vertical height and lateral movements of the roof relative to the floor at the coal face.
Industry:Mining
An instrument for measuring changes in vertical height and lateral movements of the roof relative to the floor at the coal face.
Industry:Mining
An instrument for measuring electric power in watts, the unit of electrical energy, volt times amperes; therefore, combining the functions of a volmeter and an ammeter. Abbrev., wm.
Industry:Mining
