Tissot Valve, 1904, with Animal Mask, in Use

valve_tissot_1904_animal_in_use

A Tissot-designed valve with an animal mask, shown in use on a dog. Used one-way valves so exhaled air could be collected and analyzed. From J. Tissot, “Nouvelle méthode de mesure et d’inscription du débit et des mouvements respiratoires de l’homme et des animaux”, Journal de physiologie et de pathologie générale, 1904, vol 6, pp. 692.

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