Safe Shot-Firing with Permitted Explosives

AN explosive is a solid or liquid substance which, when fired by some means, changes into a gaseous product occupying a volume very much greater than its original volume. The great speed at which this change takes place causes the explosive to exert a sudden blow on adjacent material. It is this action which is effective in blasting operations when the explosive, confined in a shot-hole, is fired.
Keywords: blasting, blasting powder, Bureau of Explosives, coal, detonator, hole, Coal, Detonators, Explosives, mining, Primers, test, Tests
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