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Zuntz-Geppert gas analyzer apparatus

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The recording and sampling apparatus is shown on the left and the air analysis apparatus at the right. (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.)