Gas Meter, Hanriot and Richet, 1908


From:  Handbuch der Physiologischen Methodik, by Robert Tigerstedt, published by Verlag von S. Hirzel, Leipzig, 1908, page 31.  Described as manufactured (assembled?) by Hanriot and Richet.  It measured exhaled air volume but also had the ability to take samples of exhaled air for later gas analysis.

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