From the Annals of Surgery, Volume 74, December 1921, page 835.
An updated version of his 1885 patent. He was already advertising and selling this version at least one year earlier.
From Homœopathic News: A Monthly Homœopathic Medical Journal, 1892, Volume 21, number 1, page 291.
A water seal spirometer with a direct reading scale on a rod attached to the bell.
From: Kurzes Lehrbuch der Physiologie für Mediciner, by Heinrich Johannes Boruttau, published 1898, page 108.
Described in a Physiology Textbook from 1899 as being used to measure the respiration in a rabbit. From Jacobsen, Pfluger’s Archive, 1888, page 236.
Described as a modified Hutchinson Spirometer. From: A Text-book of Human Physiology: Including a Section on Physiologic Apparatus, By Albert Philson Brubaker, 1919. Page 410.
From: R.M. Cherniak. The oxygen consumption and efficiency of the respiratory muscles in health and emphysema. J Clin Invest 1959, page 494.
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The diverse, quirky and mostly forgotten history of Pulmonary Function testing