Explain the principle of the miner’s safety-lamp.?

An ordinary lamp or candle cannot be used in a coal mine, as the flame would be liable to explode the “ fire­
damp.” In the miner’ s safety-lamp a gauze surrounds the flame and this gauze allows the gas in the mine to pass
through it and burn round the flame, but it prevents the flame passing outside the wire gauze and thus reaching
the “ firedamp.”

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