Krogh spirometer

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Krogh spi·rom·e·ter

a water-sealed spirometer in which the bell is a large, shallow, rectangular box rotating slightly around a horizontal axis extending along one edge, with an arm extending beyond that axis to a counterbalancing weight; comparable with a wedge spirometer.
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August, Danish physiologist and Nobel laureate, 1874-1949.
Krogh spirometer - a water-sealed spirometer.
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