From La Presse Medicale, Jan 8, 1936, page 61. Found on the Medic Database. Image med100000x1936xartorigx0065
Photograph is courtesy of Darren Hoffberger, a collector of antique spirometers. It is a bellows spirometer with its own carrying case. The volume is read off the brass scale at the back. Manufactured by Jules Richard, 25 Rue Melingue, Paris. Exact date unknown but most likely pre-1900.
The diverse, quirky and mostly forgotten history of Pulmonary Function testing