Marey type sphygmograph shown in the position for use, made in France around 1870. The sphygmograph, originally invented in 1854 by German physiologist Karl von Vierordt, was used by physicians in the mid-nineteenth century as a means of observing and measuring the pulse externally and non-invasively. The radial pulse wave forms would be traced with a mounted pen. The Marey type was developed in 1863 and named after its designer, Etienne-Jules Marey (1830-1904). This was considered an improved version of the earlier model due to its portability.
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