Explosives . Fig. 14. American Black Blasting Powders (Munroe and Hall) which the flame can penetrate. This may be seen by examining the powdersunder the The usual composition of Mack blasting powders has already been stated Blasting(p. 74). The violence of the powder can be varied by altering the composition,the density or the size of the grains : the powder is made slower by diminish-ing the percentage of saltpetre, compressing to a higher density or making1 See Cronquist, , 1906, p. 53. powders. &8 EXPLOSIVES 77-1 74 9-4 In 14-3 10 22 16 -••!. Iii France the mining j„ - lan
Explosives . Fig. 14. American Black Blasting Powders (Munroe and Hall) which the flame can penetrate. This may be seen by examining the powdersunder the The usual composition of Mack blasting powders has already been stated Blasting(p. 74). The violence of the powder can be varied by altering the composition,the density or the size of the grains : the powder is made slower by diminish-ing the percentage of saltpetre, compressing to a higher density or making1 See Cronquist, , 1906, p. 53. powders. &8 EXPLOSIVES 77-1 74 9-4 In 14-3 10 22 16 -••!. Iii France the mining j„ - lanufactured in the 8l mills are incorporated, not and . but in copper drum- with wooden and bronze ball-, and the granulation is ah 1 in drama with the aid of a spray of water. In America enormous quantities of blasting powder are used containingurn nitrate (Chili saltpetre) instead of the potassiam Bait. This burnsmore slowly than ordinary gunpowder, but i- more powerful, as it evolvesa greater volum
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Keywords: ., bookcentury1900, bookdecade1910, bookidexp, booksubjectexplosives
