Improvements in the Means of Rendering Explosives More Safe when used in Coal Mines.

摘要

8537. Hann, E. M., and Greaves, W. April 12. Blasting.-To obviate the danger attending blasting in mines, especially in case of a 'blown out . 'shot,' a frangible receptacle G containing a fireextinguishing liquid, such as water or solutions of washing-soda, sulphate or acetate of soda, or ammonium oxalate, is placed in front of and against the shot hole B and may conveniently be supported by cords L as shown.