Spirometers, Krogh and Tissot, 1932, System for measuring CO2 Response.

Spirometers_Tissot_Krogh_1932_CO2_Response

From Nederlands Tijdschrift voor Geneeskunde, May 21, 1932, page 2465. “Oorspronkelijke Stukken. Bewusteloosheir, schijndood en hun behandeling met de inademing van Koolzuur-Zurrstofmengsels” by Dr. G C E Burger and Dr. M H Tromp.

Diagram of a breathing system containing two Krogh spirometers (one with soda lime CO2 absorbant, one without) and a Tissot spirometer.  Designed to measure tidal and minute ventilation while breathing different levels of CO2 up to 10 percent.

 

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