The Mining engineer Volume 10

 
9781130212143: The Mining engineer Volume 10
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1896 Excerpt: ...packed in tinfoil cartridges to protect it from dampness. In the case of the three former explosives, when tested in the original cartridges in a pure coal-dust atmosphere, they gave rise to ignition even with comparatively small charges, but proved safe, not to say very safe, if, instead of the paraffined cartridges ordinary paper-covered cartridges were used, as may be seen in the next column. On the other hand, the nature of the original covering seemed to have no influence whatever in the case of explosives possessing a high degree of safety, as shown by a series of experiments with dahmenit A and roburit I. The first named, for instance, with a charge of 17-64 ounces in the original cartridges did not cause ignition despite the presence of 1 per cent. of fire-damp; but with a charge of 1975 ounces in non-paraffined cartridges, ignition was brought about. And even with 17-64 ounces, out of fourteen trials, ignition took place in one case in presence of 7+ per cent. of fire-damp, although the explosive was in the ordinary paper covering. Whence we see that whether the cartridges were paraffined or non-paraffined, the degree of safety was precisely the same. A similar series of experiences is recorded with roburit I, which gave rise to no ignition whatever, with either paraffined or non-paraffined cartridges. Trans. Fed. Intt.. vol. ix., page 253. f Ibid., vol. x., page 264. This curious phenomenon is alone explicable by the intervention of the temperature of detonation. If the temperature resulting on explosion is sufficiently high to vaporize and ignite the paraffin, then the influence of that substance comes in; it is ignited itself, and in turn ignites the coal-dust. But if the temperature on explosion proves insufficient to start the ignition of the ...

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