Marshal gas-oxygen-ether apparatus,1917

Numéro d’image : 11695884
Marshal gas-oxygen-ether apparatus,1917
Marshal anaesthetic apparatus,1917. Geoffrey Marshal developed this early continuous flow nitrous oxide,oxygen and ether anaesthetic apparatus during the First World War,based on a machine built in 1912 by James Gwathmey (1862-1944) . The gases were routed through two perforated tubes in a glass mixing chamber containing water. The rate of flow could be estimated by observing the force of the resulting bubbles. The apparatus had the main elements which are still present in modern machines; providing an accurate and continuous supply of medical gases such as oxygen and nitrous oxide,mixed with an accurate concentration of anaesthetic vapour (such as ether),delivered to the patient at a safe pressure and flow. Henry Boyle's machine,which was also based on an earlier Gwathmey-Woolsey apparatus,was introduced in 1917 and became the best known continuous flow anaesthetic machine
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Crédit: Science Photo Library
Taille de l’image : 3413 px × 5119 px
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