. Bulletin . A. WIRE SCREEN AND CARTRIDGES BEFORE FIRING. Wire screen of No. 1 0 wire is suspended vertically in the air with two i-pound cartridges of 40 per cent straight dynamite wiied against B. WIRE SCREEN AFTER FIRING OF CARTRIDGES. COMBUSTION AND EXPLOSION. 15 affect the rock, because they explode so slowly that the gases formedcan lift the air above them and escape; yet dynamite, fulminate ofmercury, and other high explosives, if laid on brittle or soft rockand detonated, may shatter it, because they explode so quickly thatthe gases formed from them can not lift the large volume o
. Bulletin . A. WIRE SCREEN AND CARTRIDGES BEFORE FIRING. Wire screen of No. 1 0 wire is suspended vertically in the air with two i-pound cartridges of 40 per cent straight dynamite wiied against B. WIRE SCREEN AFTER FIRING OF CARTRIDGES. COMBUSTION AND EXPLOSION. 15 affect the rock, because they explode so slowly that the gases formedcan lift the air above them and escape; yet dynamite, fulminate ofmercury, and other high explosives, if laid on brittle or soft rockand detonated, may shatter it, because they explode so quickly thatthe gases formed from them can not lift the large volume of air con-fining them without pressing back forcibly against the rock. CONFINING EXPLOSIVES. This confinement by air is not, however, close enough to give thebest result with any explosive. By boring a hole in rock and confininathe explosive firmly in it by means of well-tamped stemming, gun-powder and other low explosives may be made to break the rock, or amuch less quantity of high explosive may be used than is required tobreak it when the explosive is merely laid on it. Confining an explo-sive is the cheapest and best way of using it so as to obtain the mostservice from it. DANGER FROM GASE
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectminesandmineralresou
