The Collaborative International Dictionary of English v.0.48:

Oxyhydrogen light \Oxyhydrogen light\
   A light produced by the incandescence of some substances,
   esp. lime, in the oxyhydrogen flame. Coal gas (producing the
   oxygas light), or the vapor of ether (oxyether light) or
   methylated spirit (oxyspirit light), may be substituted for
   hydrogen.
   [Webster 1913 Suppl.]