From The Lewiston Daily Sun, Sunday, July 26, 1979, “Harvard Health Study measures effect of Brown Co. Emissions”, by Dot Jacobs. The spirometer appears to be a Collins Survey Spirometer.
Collins 5-way valve. Used for DLCO testing before automated valves had been developed. The patient mouthpiece was attached to the opening in the center. A rubber alveolar sample bag was attached to the small port at the bottom. The knob on the rear side was used by the technician to step the patient through the different stages of the test. Found on an Ebay listing.
From: Respiration Calorimeters for studying the respiratory exchange and energy transformations of man, by Frances G. Benedict and Thorne M. Carpenter, Published by the Carnegie Institute of Washington, 1910, page 5.
From: Respiration Calorimeters for studying the respiratory exchange and energy transformations of man, by Frances G. Benedict and Thorne M. Carpenter, Published by the Carnegie Institute of Washington, 1910, page 5.
From The Gaseous metabolism of Infants by F. G. Benedict and F. B. Talbot, page 43. Used as a “tension equalizer” in an infant version of Benedict’s Universal Respiration Apparatus. Manufacturer was not named.