Coal mining in Illinois . Plan. Longitudinal Section through CenterFig. 46. Sketch of underground refuge chamber struction, is lined with concrete and closed by an air lockprotected with steel explosion-proof doors. A hole 8 inchesin diameter is drilled from the surface into the chamberwhich is 7 feet high, 28 feet long, and 16 feet wide. The 146 COAL MINING INVESTIGATIONS shale roof of the chamber is supported by six concrete pil-lars two feet square. An empty powder can placed in themouth of the drill hole shows its position in fig. 45. Throughthe drill hole fresh air can be pumped to the ch
Coal mining in Illinois . Plan. Longitudinal Section through CenterFig. 46. Sketch of underground refuge chamber struction, is lined with concrete and closed by an air lockprotected with steel explosion-proof doors. A hole 8 inchesin diameter is drilled from the surface into the chamberwhich is 7 feet high, 28 feet long, and 16 feet wide. The 146 COAL MINING INVESTIGATIONS shale roof of the chamber is supported by six concrete pil-lars two feet square. An empty powder can placed in themouth of the drill hole shows its position in fig. 45. Throughthe drill hole fresh air can be pumped to the chamber and sup-plies can be lowered. Refuge chambers in coal mines are anadmirable precaution and at least two should be built inevery mine, particularly in mines in southern Illinois inwhich explosive gas and dust are found. The state of Illinois has provided three Mine RescueStations at which crews are maintained for rendering as-sistance in case of explosions or mine fires. A number ofmining companies also maintain rescue and
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectcoalmin, bookyear1915
