Wright, Mark R., 1854- · London : Longmans · leaf 56
ted sufficiently to ignite the gas on the outside.The flame goes out from lack of oxygen when the air becomesimpure, and the appearance of the flame is an indication of thedanger to which the miner is subjected. A strong wind, or asound-wave caused by an exploding shot, may force the flameagainst…
Physics
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