Transactions Volume N . 34

Transactions Volume N . 34

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1885 edition. Excerpt: ... be deemed satisfactory, more especially when the improvements made in other branches of mining are considered; and in contrasting the enormous volumes of air which are circulated through modern mines with what was considered sufficient in days gone by, together with other changes which are obvious to mining men, it is very evident that the conditions of danger to which safety-lamps are exposed are materially altered and aggravated. As to the original lamp of either Davy or Clanny, it cannot be said that, even when used simply to test a standing body of gas, or when exposed in an explosive mixture at a low velocity, its safety is free from doubt; whilst, if kept a short time in such a mixture, it would generally explode the surrounding gas. This is, however, a condition not much to be feared, testing for gas being generally done by careful persons. In a mine giving off inflammable gas, the circumstances under which the greatest danger is to be apprehended may be described as follows: --1.--A person travelling the mine, suddenly finding himself among gas, his lamp filled with flame, and the gauze becoming red hot, impulsively runs back, and so causes a velocity sufficient to pass the flame through the gauze. 2.--It frequently occurs that heavy falls of roof in the goaves drive down large volumes of gas into the level of the mine, and the gas may completely surround a person before he can make good his retreat. In this case there is a twofold danger--first, from the current created by the fall; and, second, by the person rushing out among the gas from his working-place. 3.--Outbursts, or blowers, of gas have been known to fill the galleries of a mine in a very short period, and large volumes of air have been rendered into a mixture which, more

Product details

  • Paperback | 174 pages
  • 189 x 246 x 9mm | 322g
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236615697
  • 9781236615695