- 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 ...
A method of determining the angular inclination of a borehole in which a glass, testtubelike bottle partly filled with a dilute solution of hydrofluoric acid is inserted in a watertight metal case. When the assemblage is lowered into a borehole and left for 20 to 30 min, the acid etches the bottle at a level plane from which the inclination of the borehole can be measured. Compare: Kiruna method.
Industry:Mining
A method of determining the angular inclination of a borehole in which a glass, testtubelike bottle partly filled with a dilute solution of hydrofluoric acid is inserted in a watertight metal case. When the assemblage is lowered into a borehole and left for 20 to 30 min, the acid etches the bottle at a level plane from which the inclination of the borehole can be measured. Compare: Kiruna method.
Industry:Mining
A method of determining the angular inclination of a borehole in which a glass, testtubelike bottle partly filled with a dilute solution of hydrofluoric acid is inserted in a watertight metal case. When the assemblage is lowered into a borehole and left for 20 to 30 min, the acid etches the bottle at a level plane from which the inclination of the borehole can be measured. Compare: Kiruna method.
Industry:Mining
A method of determining the angular inclination of a borehole in which a glass, testtubelike bottle partly filled with a dilute solution of hydrofluoric acid is inserted in a watertight metal case. When the assemblage is lowered into a borehole and left for 20 to 30 min, the acid etches the bottle at a level plane from which the inclination of the borehole can be measured. Compare: Kiruna method.
Industry:Mining
A method of determining the composition of a material employing chemical techniques by which the various elements are quantitatively separated.
Industry:Mining
A method of determining the hardness of microconstituents by using the Knoop or Vicker's type of diamond indenter.
Industry:Mining
A method of determining the indentation hardness of metals by measuring the load required to force a spherical penetrator into the metal to a specified depth.
Industry:Mining
A method of determining the relative hardness of metals and case-hardened materials. The depth of penetration of a steel ball (for softer metals) or of a conical diamond point (for harder metals) is measured.
Industry:Mining
A method of direct reduction of iron ore. The reduction of the ore was carried out in interchangeable containers. The ore was heated to the reduction temperature in one container, and then this container was moved into the reducing zone.
Industry:Mining
A method of dredging permanently frozen ground in Alaska and the Yukon Territory in which steam is forced through pipes that are fitted with steel points on one end and a driving head on the other end so that the pipes can be hammered into the frozen gravel. Thawing by steam is a slow and costly process.
Industry:Mining
