Dale-Schuster pump, double, with spirometer for measuring oxygen consumption, European, c. 1927 Dale-Schuster pump, Europe, 1922-1932
Benzinger-style Seebeck envelope calorimeter (gradient layer calorimeter) SEC-A, by Thermonetics Corporation, c.1960 Benzinger-style Seebeck envelope calorimeter (gradient layer calorimeter) SEC-A