National Cylinder Gas (division of Chemtron) Pulmonary Function Indicator, 1974. Used a hot-wire transducer to measure gas flow.
From: Burton RM, Kozel WM, Penley RP, Ward GH, Chapman RS. Application and evaluation of portable field instruments for measuring Forced Expiratory Volume of children and adults in environmental health surveys. Environmental Health Perspectives, 1974; 8: 123-131. Page 125.
From: Burton RM, Kozel WM, Penley RP, Ward GH, Chapman RS. Application and evaluation of portable field instruments for measuring Forced Expiratory Volume of children and adults in environmental health surveys. Environmental Health Perspectives, 1974; 8: 123-131. Page 124.
From: Bellows spirometer and transistor timer for the measurement of forced expired volume and vital capacity. By M.M Collins, M. McDermott and T.J. McDermott. Proceedings of the Physiological Society, Cardiff Meeting, April 17-18 1964. Page 39P.
From: The Harvey Lectures, Volume 3, 1909, page 226. A standard Hutchinson-style spirometer outfitted with what appear to be Muller (water seal) one-way valves and a mask for measuring tidal or minute volume.
Paramagnetic oxygen analyzer. Mechanism was a glass dumbbell suspended by a glass thread between the poles of a magnet. The amount by which the dumbbell rotated depended on the amount of oxygen in the sample chamber. A light reflected off a mirror attached to the dumbbell and showed up as a light spot on the front panel display. The black bulb in the rear was used to pull a gas sample into the analyzer. Photo is courtesy of Jim Sullivan, Supervisor, Pulmonary Diagnostic Laboratories at Memorial Sloan-Kettering Cancer Center.