Wels·bach burner(wĕlz′băk′, -bäk′)
A trademark for a lamp consisting of a gas burner and a gauze mantle impregnated with cerium and thorium compounds that becomes incandescent when heated by the burner.
Welsbach burner(ˈwɛlzbæk; German ˈvɛlsbax)
(Chemistry) trademark a type of gaslight in which a mantle containing thorium and cerium compounds becomes incandescent when heated by a gas flame
[C19: named after Carl Auer, Baron von Welsbach (1858–1929), Austrian chemist, who invented it]