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German physiologist Adolf Loewy (1862-1936) using Zuntz portable gas meter

German physiologist Adolf Loewy (1862-1936) shown combining measurement of respiration with the Zuntz portable gas meter with simultaneous registration of pulse and respiratory movements using a kymograph. (Source: Zuntz N, Loewy A, Müller F, Caspari W. Höhenklima und Bergwanderungen in ihrer Wirkung auf den Menschen : Ergebnisse experimenteller Forschungen im Hochgebirge und Laboratorium. Berlin: Bong & Co., 1906. Public domain.)

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