Abstract
Experiments using a lung performance analyser demonstrate that if a 1 m length of corrugated 22 mm diameter anaesthetic breathing how (volume 530 ml) is interposed between a lung ventilator delivering air, and the Penlon Bain-type co-axial anaesthetic circuit and valve (volume 660 ml), air-dilution of the respired gas mixture is effectively prevented under conditions likely to be used in clinical practice.

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