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Coal Measures and Coal Mining in Iowa, including paleontology and a discussion on the coal formation; also the methods of mining by Russell T. Hartman, 1898

Coal Measures and Coal Mining in Iowa by Russell T. Hartman, 1898, Page 196

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[page]196[/page] room is turned from the entry (b) and the entry (f) at the same time. Usually two miners are placed at each end of a room; two starting at B work out one half of the coal and two starting at A work out the other half meeting the miners from B in the middle of the room. When a room is thus worked out it is closed tightly at each end to prevent the air from taking a short route through and to prevent spontaneous combustion of teh dibris left in the room. There is of necessity a large amount of coal left between the rooms to hold up the roof. This is left in the form of irregular blocks as show at D. These blocks called pillars are removed from a section after the room work is completed in that section. When the roof shale is treacherous in the rooms it is kept
 
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