Taken from: Kansas State College of Agriculture and Applied Science. Technical Bulletin 36, June 1934. The relation of Phosphorus deficiency to the utilization of feed in dairy cattle.
This portable spirometer is made of brass, rubber and glass in a mahogany case. It was made by Arnold and Sons of London. The patient’s breath bubbled up a water-filled collecting glass and pushed up a sliding weight. A scale on the attached spirometer indicated the capacity of the lungs. Scientific instrument maker, Robert Mann Lowne (1844-1929) patented this portable spirometer in 1865.
From McClendon JF, Anderson HC, Steggerda FR, Conclin C, Whitaker M. A simple respiration apparatus for determination of oxygen and carbon dioxide in indirect calorimetry. Journal of Biological Chemisty, 1928; 77: 413-420.
The diverse, quirky and mostly forgotten history of Pulmonary Function testing