carbide lamp
noun
: a lamp that produces light by the combustion of acetylene gas created by the measured combination of water and calcium carbide
The major disadvantage of a carbide lamp is that it blows out quite easily in windy passages and is next to useless when climbing in a waterfall.—David R. McClurg, The Amateur's Guide To Caves & Caving, 1973
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Merriam-Webster unabridged
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