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A mesh-like object, generally made of thorium oxide, used to cover flames in lanterns, etc.
- The low infrared emissivity and high visible emissivity of thorium (Th) make it useful in radiating flame energy as light rather than heat.
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In 1890, thorium was found to be superior to magnesium, and in 1891, he perfected a combination of 99 percent thorium oxide and 1 percent cerium oxide that produced a much whiter light and a stronger mantle. The gas mantle played a major role in street lighting until the widespread use of electric lights in the early 1900s.
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