LIQUID AIR TO SET EXPLOSIVE GOING.

Pelorus Guardian and Miners' Advocate., Volume 18, Issue 44, 31 May 1907, Page 7

LIQUID AIR TO SET EXPLOSIVE GOING.

Liquid air blasting cartridges as described by M, Jacquicr, are made b' packing powdered charcoal in a case of stout paper, and covering tins with an asbestos wad, through which a paper tube passes to the bottom of the cartridge. When icady to use, liquid air is poured into the tube, the cartridge being fired by a fulminate cap in the usual way. The tiring should follow the filling within ten minutes, a s the liquid air gradually evaporates, and after half-an-hour “missed-lire” cartridges offer no danger to the workmen. These cartridges proved much cheaper than dynamite when tried in the Simplon tunnel. Th ■dr use had to be abandoned, however, owing to the bad air developed.