Wiktionary
hydrogen lamp
n. a glass apparatus in which hydrogen, generated from zinc and sulphuric acid, is burnt; used primarily as a demonstration (invented by Alessandro Volta)
Usage examples of "hydrogen lamp".
A small engine compartment held a hydrogen lamp or fuel cell, to drive the wheels in the free-zone stretches of road.
What would have been forces in an unmodified lamp were now no more than sketches of something more abstract and subtle still, despite which the hydrogen lamp kept right on working anyway.