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An electric glow lamp having filaments of metallic tungsten. Such lamps, owing to the refractory nature of the metal, may be maintained at a very high temperature and require an expenditure of only about 1.25 watts per c…

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  1. An electric glow lamp having filaments of metallic tungsten. Such lamps, owing to the refractory nature of the metal, may be maintained at a very high temperature and require an expenditure of only about 1.25 watts per candle power.
  2. An electric glow lamp having filaments of metallic tungsten.Such lamps, owing to the refractory nature of the metal, may bemaintained at a very high temperature and require an expenditure ofonly about 1.25 watts per candle power.