Excerpt from Approved Electric Lamps for Miners
When small electric bulbs, with their clear, white light, and small electric storage batteries became available, the advantage of com bining these elements for a miner's lamp seemed manifest. The com bination looked simple and s... afe, but was soon found to have ele ments of danger and weakness peculiar to itself.
The Bureau of Mines showed, in 1911, that the breaking of a miniature electric bulb in an in¿ammable mixture of gas and air might ignite the mixture, so that only the fragile glass of the lamp bulb might stand between the miner and injury or death. There was also a possibility that sparks from the small battery would ignite gas, and the accidental spilling of the contents of a battery on the miner's clothing or skin was a possible source of injury.
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