- 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 ...
Excess in size of a casting because the mold is larger than the pattern when the latter is unduly rapped, as with the hand, for drawing.
Industry:Mining
Exemption laws are grants of personal privileges to debtors, which may be waived by contract or surrender or by neglect to claim before sale.
Industry:Mining
Expansion in which no heat is added to or subtracted from the air, which cools during the expansion because of the work done by the air.
Industry:Mining
Expendable heavy-gage bare copper wire used to connect detonators or series of detonators in parallel in underground blasting.
Industry:Mining
Experience has proved that the following are allowable velocities in pipes: air, 30 to 50 ft/s (9.1 to 15.2 m/s); compressed air, 25 to 40 ft/s (7.6 to 12.2 m/s); steam, 160 to 250 ft/s (46.8 to 76.2 m/s); water, 5 to 10 ft/s (1.5 to 3.0 m/s).
Industry:Mining
Exploders of the magneto type that are operated by the twist action given by a half-turn of the firing key. A magneto exploder consists essentially of a small armature that can be rotated between the poles of a set of permanent magnets. The armature is rotated by means of toothed gear wheels actuated by the movement of the firing key. The electric circuit between the exploder and the detonator is completed by means of an automatic internal switch operating at the end of the stroke, or contact may be made by means of a pushbutton.
Industry:Mining
Exploration for radioactive minerals utilizing various instruments, generally a Geiger counter or scintillation counter, by measuring the natural radioactivity of earth materials.
Industry:Mining
Explosive consisting of an intimate mechanical mixture of substances which consume and generate oxygen but are not in themselves explosive. Inorganic nitrates, chlorates, and perchlorates. Most important is ammonium nitrate.
Industry:Mining
