oxy-gas torch

First use appears c. 1909. See cite below.

oxy-gas torch (plural oxy-gas torches)

1. A type of torch in which the oxygen and the hydrogen are led off the electrolysis cell separately and are fed into the two gas connections.
   • 1909, The University of California (publisher), Machinery - Volume 16, page 963:

     In this instance, an oxy-gas torch was used very effectively for this purpose, and a space two inches wide was quickly cut in the web which had a section of 5 by 15 inches.