- 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 ...
Steel bars of various shapes used in concrete construction to give added strength.
Industry:Mining
Steel bars placed in contact with the roof and at right angles to the longwall face. They are usually supported by yielding steel props. The bar can be extended to support newly exposed roof by adding another bar, which can be locked onto it by a simple wedge or pin arrangement. The hinged bar is widely used on conveyor faces in continuous mining.
Industry:Mining
Steel bars with a hook at one end and prongs at the other, which are inserted in the drawbar at the rear of the tub ascending an incline so as to prevent it running back.
Industry:Mining
Steel cap placed above line of casing pipes of drill hole to protect threaded top of pipe while driving them deeper. Driving shoe gives protection to the bottom pipe of line.
Industry:Mining
Steel joists hinged to a substantial cross joist in the roof that are held up by a stirrup during normal running. If a tram runs away down the incline, the stirrup is disengaged by 1006 means of a wire operated from the top of the incline; one end of the hinged joist falls into the rail track and arrests the runaway.
Industry:Mining
Steel made by melting blister bar, wrought iron, charcoal, and ferroalloys in crucibles that hold about 100 lb (45 kg). This was the first process to produce steel in a molten condition, hence the product called cast steel. Mainly used for the manufacture of tool steels, but now largely replaced by the electric-furnace process.
Industry:Mining
Steel made from pig iron by a process in which the first step is the granulation of the iron.
Industry:Mining
Steel made in a Bessemer converter using a basic refractory lining. The process was developed by Thomas and Gilchrist. In Europe such steel is known as Thomas steel; in Great Britain, Thomas-Gilchrist steel; and in the United States, basic Bessemer steel.
Industry:Mining
