If you were a coal miner in the early 1800s, the light you used was an openflame oil lamp?even though mines were sometimes filled with "fire-damp," a volatile mixiture of air and methane gas. Explosions were inevitable, and at times, threw bodies from mine shafts like grapeshot from a cannon. Humphry Davy became a national hero when, in 1815, he found a remedy: Surround the lamp flame with mosquito screen.
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