This is the back bar for a Boyle's-type anaesthetic machine. It has vaporisers for the anaesthetics ether and trilene, and flow meters for oxygen, cyclopropane and nitrous oxide – the last two are also anaesthetics – and a re-breathing bag. The basis of the modern anaesthetic machine was pioneered by Henry Gaskin Boyle (1875-1941), an anaesthetist. The original machine from 1917 was carried around in a wooden box and used ether and nitrous oxide.
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Glossary: anaesthetic machine
An agent that causes insensitivity to pain. Applied to either the whole body (general anaesthetic) or a particular area or region (local anaesthetic).