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Spirometer, 1876-1900.

Made by Walter Lecuyer, Paris, of iron and brass construction. Spirometers were developed in England in the 1840s. They were used to measure the vital capacity of the lungs, that is, the largest amount of air they can hold, which indicates the health of the respiratory system. The patient's breath bubbled up a water-filled collecting drum and pushed up a sliding cylinder, which was counterbalanced by a weight. A measuring scale showed the capacity of the lungs.

Image No. 10289213 | This is a Rights Managed image.

Inventory No.: A602278
Credit © Science Museum / Science & Society Picture Library -- All rights reserved.
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