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  • 1900s – Page 5 – PFT History
    From: Handbuch der Physiologischen Methodik, by Robert Tigerstedt, published by Verlag von S Hirzel, Leipzig, 1908, page 32 Described as manufactured (assembled?) by Hanriot and Richet It measured exhaled air volume but also had the ability to take samples of exhaled air for later gas analysis 1900s, Gas meter, Photograph, Uncategorized
  • Photograph – Page 18 – PFT History
    Tissot spirometer used for BMR measurements From Can Med Assoc J 1918 June; 8 (6): 491–509 The determination of basal metabolism by the “Respiratory-valve and spirometer method” of indirect calorimetry, with an observation on a case of polycythemia with splenomegaly Maude E Abbott Tissot 1920s, Photograph, Spirometer





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