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
Described in text as a 30 liter recording spirometer. From: Boothby WM. The determination of the circulation rate in man at rest and in work. Amer J Physiol, 1915, v37, p383.
From: Benedict FG, Miles WR, Roth P, Smith HM. Human vitality and efficiency under prolonged restricted diet. Published 1919 by the Carnegie Institute of Washington.