From: Basal Metabolism: Its determination and Application. FB Sanborn. Page 123. Published 1922. Variation of a Krogh Spirometer. Described in text as being 17 inches high and weighing 40 pounds.
From Wilmore JH, Davis JA, Norton AC. An automated system for assessing metabolic and respiratory function during exercise. J Appl Physiol 1976; 40(6): 619-624.
Wood cabinet with drawer in front to hold accessories. Top right side has compartment to hold oxygen tank. Control panel is metal. Has two breathing tubes ending in mouthpiece. Clear covered carbon dioxide exhalation chamber for bucket of “metabolime.” Readout recorder with original paper. Dials, light, and switches.