. Bulletin . BLASTING AND MINE EXPLOSIVES. 21 In some work, such as in winning broken stone for concrete or ballast anc1 in open-cut operations, it is necessary to chamber the bottom of drill hole with dynamite or other suitable high explosive before barging it with black blasting powder. By this procedure a large Lj is formed at that point where the powder can be placed to the advantage. When drill holes are chambered they become hot . should not be reloaded immediately after a chambering shot has been fired, for the new charge may explode prematurely. GRANULATED NITROGLYCERIN TOWDERS. Granul
. Bulletin . BLASTING AND MINE EXPLOSIVES. 21 In some work, such as in winning broken stone for concrete or ballast anc1 in open-cut operations, it is necessary to chamber the bottom of drill hole with dynamite or other suitable high explosive before barging it with black blasting powder. By this procedure a large Lj is formed at that point where the powder can be placed to the advantage. When drill holes are chambered they become hot . should not be reloaded immediately after a chambering shot has been fired, for the new charge may explode prematurely. GRANULATED NITROGLYCERIN TOWDERS. Granulated nitroglycerin powder such as is generally offered forsale in this country has about the following composition: Composition of granulated nitroglycerin powder. Per cent. Nitroglycerin 5 Combustible material a 35 Sodium nitrate 60 100 The composition of the grains of granulated nitroglycerin powdersis somewhat similar to that of the grains of black blasting powder,but instead of the nitrate and combustible
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectminesandmineralresou
