Calcium carbide was used in carbide lamps, in which water drips on carbide
and the formed acetylene is ignited. These lamps were of no use in coal
mines where the presence of the explosive gas methane made them a
serious hazard. The presence of explosive gases in coal mines led to
the miner safety lamp. However carbide lamps were used extensively in slate, copper and tin mines, but most have now been replaced by electric lamps. Carbide lamps are still used by some caversexploring caves and other underground areas, though they are increasingly being replaced in this use by LED lights. They were also used extensively as head lights in early automobiles, although in this application they are also obsolete, having been replaced entirely by electric lamps.
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