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12/1/2005 - Information CircularsThe purpose of this study was to compare calibration gas cylinders having balance gases of nitrogen or air that are commonly used to calibrate portable NO2 gas monitors. Because even low concentrations of NO2 can have an extremely adverse effect on ind...
1/1/1990 - Information CircularsThe U.S. Bureau of Mines evaluated product-of-combustion characteristics of combustible materials used in coal mining in experiments conducted in an intermediate-scale fire tunnel, and evaluated each material's effectiveness for mine fire detection.
1/1/1986 - Information CircularsThe Bureau of Mines used sulfur hexafluoride (sf6) tracer gas to evaluate the effectiveness of gob ventilation and/or sealing practices at three coal mines, each having different problems associated with their mined-out areas.