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accidents Aldwarke apparatus believe bituminous black powder Bldg brattice butt entries Carbonite carried cars cause cent CHAIRMAN-I charge coal dust Coal Mining Institute coke Colliery combustion committee concrete connection cost dangerous detonation discussion dust explosion electric experiments face fact feet Fire Boss firedamp first-aid flame Fohl Foreman give Greensburg haulage ignition inches Inspector Institute of America Jones machine main entries manager matter meeting methods miners Mining Congress Mining Engineer mining school minute Monongah motion motor operation organization oven paper PAYNE-I Pennsylvania pipe Pittsburg plant plosion possible practical present President primary explosion pumps question rock safety lamps safety powder seam Secretary shaft shot steel Stoek Superintendent temperature tests things timber tion Trauzl tricity trolley pole Uniontown velocity velocity of detonation ventilation West Virginia wire writer