Portable respiration apparatus ready for bedside use with subjects at the International Young Men’s Christian Association College, Springfield, Massachusetts.
Benedict and Tompkins, Boston Med. and Surg. Journ., 1916
From :http://chestofbooks.com/health/nutrition/Restricted-Diet/Method-Of-Calculating-Oxygen-Consumption-Part-2.html#.UdB3jPnCaSo#ixzz2Xj2etuLW
From: A simple device for measuring rate of metabolism. Harry M. Jones. The Archives of Internal Medicine, 1921, Volume 27, Page 48.
From: The Mechanics of Surgery: (1899) by Charles Truax, page 48.
A turbine-style An early version of a turbine spirometer.
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.
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The diverse, quirky and mostly forgotten history of Pulmonary Function testing