Chakrabarti M K, Selman B J, Whitwam J G
Br J Anaesth. 1977 Jan;49(1):83-5. doi: 10.1093/bja/49.1.83.
A spirometer is described for the continuous breath-by-breath measurement of expired tidal volume (VE). This spirometer differs from other similar equipment in using a pneumotachograph to define the duration of the inspiratory phase.