a gas burner
with a gauze
with thorium oxide
and cerium oxide: when lighted, the gauze gives off an incandescent, greenish light
Webster’s New World College Dictionary, 4th Edition. Copyright © 2010 by
Houghton Mifflin Harcourt. All rights reserved.
Word origin of 'Welsbach burner'< Welsbach, a trademark for such a device, after C. A. von Welsbach (1858-1929), Austrian chemist, its inventor