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German physiologist Adolf Loewy (1862-1936), marching with Zuntz portable gas exchange measuring device

Loewy, ready to begin marching with the Zuntz portable gas exchange measuring device. (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.)