Nitrous oxide (laughing gas) canister, European, c. 1840-1868. In the late 1860s, nitrous oxide replaced chloroform as the preferred anaesthetic in dentistry. [4218×2832]

Nitrous oxide (laughing gas) canister, European, c. 1840-1868. In the late 1860s, nitrous oxide replaced chloroform as the preferred anaesthetic in dentistry. [4218×2832]