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.
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.