Welsbach, Carl Auer, Baron von

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Welsbach, Carl Auer, Baron von (kärl ou`ər bärōn` fən vĕls`bäkh), 1858–1929, Austrian chemist. He discovered the rare earth elements neodymium and praseodymium (1885) and lutetium (c.1908, independently of the French chemist Georges Urbain). He is known also for the invention of the Welsbach mantle Welsbach mantle or Welsbach burner [for C. A. von Welsbach ], cylindrical framework of gauze impregnated with oxides of thorium and cerium. When heated in a gas flame, it produces a very bright light because of the incandescence of the oxides.
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