Found on Pinterest. Labeled as “Analysis of exhaled air during an exercise with Waller’s device, 1920.” Although the spirometer is not labeled, it looks like the Verdin spirometer which was based on a gas meter. Posted by Françoise Soros.
Found on Pinterest. Labeled as “Analysis of exhaled air during an exercise with Waller’s device, 1920.” Although the spirometer is not labeled, it looks like the Verdin spirometer which was based on a gas meter. Posted by Françoise Soros.