...to the causes of mine explosions, methods of mining, especially in relation to the safety of miners, the appliances best adapted to prevent accidents,...under which mining operations are carried on, the use of explosives and electricity, the prevention of accidents and other inquires and technologic investigations...

...Bureau of Mines is rharged with the investigations of the methods of mining, especially In relation 10 the safety of miners and the appliances best adapted...treatment of ores and other mineral substances, the use of eiplosives and electricity, the prevention of accidents, and other inquiries and technological Investigations...

...its director, under the direction of the Secretary of the Interior, to make diligent investigation of the methods of mining, especially in relation to the safety of miners, and the appliances beet adapted to prevent accidents, the possible improvement of conditions under which mining operations...

...of the United States, to make diligent investigation of the methods of mining, the safety of miners, the possible improvement of conditions under which...operations are carried on, the treatment of ores, the use of explosives and electricity, the prevention of accidents, the value of mineral products and...

...and duty of said Bureau to make diligent investigations of the methods of mining, especially in its relation to the safety of miners and the appliances best adapted to prevent accident, etc., and to make other inquiries and technological investigations pertinent to said industry...

...Its director, under the direction of the Secretary of the Interior, to make diligent investigation of the methods of mining, especially In relation to...which mining operations are carried on, the treatment or ores and other mineral substances, the use of explosives and electricity, the prevention of accidents,...

...investigation of mine explosions, taken over from the Geological Survey, it included investigation of the methods of mining, especially in relation to:...to prevent accidents; The possible improvement of the conditions under which mining operations are carried on; The treatment of ores and other mineral...

...investigation of mine explosions, taken over from the Geological Survey, it included investigation of the methods of mining, especially in relation to:...to prevent accidents ; The possible improvement of the conditions under which mining operations are carried on; The treatment of ores and other mineral...

...investigation of mine explosions, taken over from the Geological Survey, it included investigation of the methods of mining,, especially in relation...appliances best adapted to prevent accidents; The treatment of ores and other mineral substances; The use of explosives and electricity; and The prevention...

...investigation of mine explosions, taken over from the Geological Survey, it included investigation of the methods of mining, especially in relation to:...appliances best adapted to prevent accidents; The treatment of ores and other mineral substances; The use of explosives and electricity; and The prevention...