Marey type sphygmograph, Paris, France, 1860-1904

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Credit: Marey type sphygmograph, Paris, France, 1860-1904. Science Museum, London. Attribution 4.0 International (CC BY 4.0)

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French physiologist Étienne-Jules Marey developed this sphygmograph. Marey improved the basic sphygmograph invented by German physiologist Karl Vierordt (1818-84) in 1855 by making it portable. It is thought this instrument may have belonged to Marey himself. A sphygmograph records the pulse. It is placed on the wrist. The movement of the pulse is transmitted through the rubber diaphragm. A lever attached to the diaphragm records the pulse contraction on smoked paper. maker: Verdin, Charles Place made: Paris, Ville de Paris, Île-de-France, France

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