Experimental human body plethysmograph. Machine was used to measure lung capacity. A person would sit inside the box with his head in the glass dome on top and breathe into the tube on front of dome. Machine is wooden and "L" shaped, designed to fit around a seated human, and latches closed. A spirometer would have rested on wooden edge. Two thermometers affixed to front measured interior and exterior temperatures. Tubing, gauge, and motor are affixed to right side. Rear of machine has attached wires and area marked "Sears-port".
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Notes:
This experimental human body plethysmograph was created between 1960 and 1980 at the Harvard T. H. Chan School of Public Health, and was used to measure lung volume and breathing rate in humans. The machine was donated to the Warren Anatomical Museum by the Harvard T. H. Chan School of Public Health's Department of Environmental Health in 2015.