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accidents accumulation actual adequate aken amount of delay application attention auxiliary fan auxiliary ventilation blasting blower fan Bureau of Mines cable canvas tubing careless cause coal mines compressed air concentration of workmen considerable conveyor loading conveyor units cost cribs cutting machines dangerous detonator disastrous disregarded duced dusty electrical eliminate equipment explosion originating face before shooting face conveyors falling favor feet flame formation of dust frequently guarding hand-loaded handling hazards in connection heretofore holes ical ignition increase inher installations instances least less light loaders loss machine operators main ventilating means mechanical loading mechanical mining mechanical units ment methods mining machine mining system modern safety moved noise number ordinarily permissible permitted possible posts precautions prevent production relatively small Reprinted results rock-dust roof room conveyor sacrificed short shot shouted shovel signals standard standpoint sufficient quantities tamp tance tended to reduce tendency timbering tonnage type unsafe practices usually warnings water wire