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- Joined: 25 Feb 2013 20:23
I've seen the term, in its modern (homicidal) context, used in US newspapers dating from the mid-late 1920s and throughout the 1930s.
Given that gassing in an enclosed space may have been used as a method of mass murder at least as early as 1803, although not AFAIK called 'gas chamber' at the time, the term may have been coined a lot earlier than the 1920s. I wonder if killing jars (a seemingly indispensable part of the equipment of any budding entomologist) might also have been called 'gas chambers' in early literature?