Technical Paper, Issue 190U.S. Government Printing Office, 1918 - Mines and mineral resources |
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Common terms and phrases
accumulation of methane afterdamp air current air samples anemometer barometric pressure bituminous coal body of gas body of methane brattice BULLETIN Bureau of Mines carbon dioxide cause Clarence Hall coal dust coal mines coal-dust explosion cubic feet danger decisions on mines decrease diffusion eddy currents electric Emission of methane fall of roof Fan started Fan stopped fan was stopped feeders feet of air figs firers Franklin County G. A. Burrell G. S. Rice gases ignition inches increase interrupted ventilation J. W. Thompson last open crosscut methane accumulation methane content methane may accumulate methane percentages methane to accumulate miners mines in Illinois mines where methane Montgomery County open lights oxygen p. m. water gage percentages of methane safety lamp samples taken samples were collected short-circuit shot firing shot-firing slow the fan split of air stratify Table TECHNICAL PAPER tests trip of cars ventilating current Vermilion County Vigo County
Popular passages
Page 24 - The selection of explosives used in engineering and mining operations, by Clarence Hall and SP Howell. 1913. 50 pp., 3 pis., 7 figs. BULLETIN 51.
Page 25 - BULLETIN 101. Abstracts of current decisions on mines and mining, October, 1914, to April, 1915, by JW Thompson. 1915. 138 pp. BULLETIN 105.
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Page 4 - Iowa, in co-operation with the Illinois State Geological Survey and the Engineering Experiment Station of the University of Illinois...
Page 25 - BULLETIN 143. Abstracts of current decisions on mines and mining, reported from May to August, 1916, by JW Thompson.
Page 25 - Abstracts of current decisions on mines and mining, reported from January to April, 1916, by JW Thompson.
Page 24 - JA Davis. 1914. 271 pp., 6 pis., 45 figs. BULLETIN 60. Hydraulic mine filling, its use in the Pennsylvania anthracite fields, a preliminary report, by Charles Ensian.
Page 4 - There are many mines or sections of a mine in which only a small quantity of methane is generated and where, under regular conditions of ventilation, it is so diffused with the air as not to be detectable with a safety lamp. These places are considered nongaseous and often no concern is felt if the ventilation is interrupted even for several hours at a time. That locally in such mines there may be dangerous accumulations of...
Page 19 - Emission of methane from inaccessible and abandoned workings, as a rcsult of either an increase or decrease in the pressure of the ventilating current. (3) Local accumulations of methane resulting from any interruption of the normal ventilating current.
Page 4 - ... gotten out as quickly as possible. There are many mines or sections of a mine in which only a small quantity of...