Found in Public Ownership of Public Utilities, Volume 7, page 243.
Manufactured by the Spirometer Company. Found in Philharmonic: A Magazine Devoted to Music Art Drama, Volume 1, April 1901, page vi.
From American Medical Directory, Volume 7, 1921, page 2379.
From, The American Physician, Volume 27, January, 1922, Page 80.
From The American Journal of the Medical Sciences, Volume 161, 1921, page 9.
From: The Journal of the American Medical Association, Volume 77, number 13, 1921, page 26.
Found in Surgery, Gynecology & Obstetrics, Volume 32, June 1921, Page 5. This is the Jones Metabolimeter.
Found in Surgery, Gynecology & Obstetrics, Volume 32, May 1921, Page 9. This is the Jones Metabolimeter.
From Modern Hospital, 1922, Volume 18, page 137.
From the Journal of the American Medical Association, Volume 79, 1922, page 24.
The diverse, quirky and mostly forgotten history of Pulmonary Function testing