The Coal Mines: Containing a Description of the Various Systems of Working and Ventilating Mines, Together with a Sketch of the Principal Coal Regions of the Globe, Including Statistics of the Coal ProductionRobison, Savage & Company, 1876 - 367 σελίδες |
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accident aggregate Alleghany coal field anthracite coal basin beds of coal bituminous blast bottom Brier Hill Britain burning carbonic carbonic acid carboniferous cent Coal Company coal measures coal mines coal region coal seams coal strata colliery contains crush cubic feet death different seams district eight engine England entries explosion extends feet in thickness fire fire-damp five forty four furnace galleries George's Creek hole hundred and fifty hundred feet inches inflammable gas inspector of mines iron lignite long wall long-wall lower Mahoning valley manager miners MINING LAW Ohio Ohio River opened operations outcrop owner Pennsylvania pillar and room Pittsburgh pump Railroad reached River rocks roof safety lamp seams of coal shaft shaft mining sinking slope square miles steam strata surface temperature thousand feet thousand square miles tion tons twelve twenty underground upcast VEIN ventilation Western coal field workable workmen Zollverein