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50-Cap Blasting Machine Development Program.
For Reference Only At Bureau Libraries :11 pages
Owing to the demands of industry for a permissible 50-cap blasting machine, the Bureau of Mines contracted with Magnavox Company to design such equipment. From the preliminary analysis of the technical requirements of the blasting machine, a new electrical design, which would eliminate the need for mechanical switches to switch high voltage, was conceived. This new design utilized simple, straightforward techniques to overcome several problems identified in the original design and, at the same time, increase inherent reliability of the equipment. The central feature of the new circuit was a transistorized timing generator capable of driving the output silicon controlled rectifiers (scr's) directly. Approval and testing of this equipment by the Bureau of Mines has not been completed.
For Reference Only At Bureau Libraries
Page last reviewed: March 11, 2019
Content source: National Institute for Occupational Safety and Health Education and Information Division