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Meaning of Welsbach burner

Wels'bach burn"er

Pronunciation: (welz'bak, -bäk Ger. vels'bäkh), [key]
— Trademark. Trademark.
  1. a brand of gaslight consisting essentially of a Bunsen burner on which an incombustible mantle composed of thoria and some ceria becomes brilliantly incandescent when exposed to flame.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.