Nicholson sphygmomanometer in its case, dating from 1910, America. The sphygmomanometer was originally invented by Samuel Siegfried Karl Ritter von Ba

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Nicholson sphygmomanometer in its case, dating from 1910, America. The sphygmomanometer was originally invented by Samuel Siegfried Karl Ritter von Basch in 1881 and was used to measure blood pressure. In this example, the reading would be taken from the level of mercury in a vertical glass tube.

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Size: 3552px × 5437px
Photo credit: © Science Photo Library / Alamy / Afripics
License: Licensed
Model Released: No

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