- 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 used in measuring borehole deviation which transmits electrical signals, communicating to the surface the position of a plumb bob fitted with a needle relative to four electrodes arranged N.,S.,E., and W.--the needle and electrodes being immersed in the electrolyte. Signals are matched with a similar arrangement of needle and electrodes at the surface, and the needle then indicates the deviation and the direction of deviation.
Industry:Mining
An instrument used in measuring the depth of water by the time required for a sound wave to travel from surface to bottom and for its echo to be returned. It may also be used for measuring the rise and fall of the tides in offshore localities.
Industry:Mining
An instrument used in preparing blasting holes; used before the safety fuse was invented.
Industry:Mining
An instrument used in the determination of the particle size of clays by the sedimentation method.
Industry:Mining
An instrument used to determine the porosity of a rock sample by comparing the bulk volume of the sample with the aggregate volume of the pore spaces between the grains. Porosimeters are of various designs, some using liquids and some using gases, at known pressures, to find the volume of openings.
Industry:Mining
An instrument used to measure the force per unit area exerted by a confined fluid or gas.
Industry:Mining
