Respirometer, E. Zimmerman, circa 1910

Spirometer_1910_Boerhaave_E_Zimmerman

Found on the Boerhaave Museum of the Netherlands website.  Inventory Number V19429. Attributed to E. Zimmerman.  Height 46 cm, width 20 cm, depth 25 cm.  A somewhat unusual design since there appears to be 2 taps underneath the spirometer.  How they connect to the interior of the spirometer and how they were used is unclear.  The museum places it between 1900 and 1925 and it is likely from around 1910 since that is the time E. Zimmerman was known to be constructing spirometers.

Respiration Calorimeter, 1902, Atwater & Benedict

Respiration_Calorimeter_1902_Atwater_&_Benedict

From “Experiments on the metabolism of matter and energy in the human body, 1900-1902”.  US Department of Agriculture, Office of Experiment Stations – Bulletin No. 136, by W.O. Atwater and F.G. Benedict, frontispiece.

The respiration chamber was an open-circuit design. Carefully conditioned room air was drawn into the chamber and then evacuated through soda-lime canisters.  The chamber was carefully insulated and kept at a constant temperature by circulating water.