Modification of the Dudgeon sphygmograph with tambour in its case, dating from around 1890, England. This instrument is made out of nickel and has a c
Modification of the Dudgeon sphygmograph with tambour in its case, dating from around 1890, England. This instrument is made out of nickel and has a clockwork mechanism. The sphygmograph, originally invented in 1854 by German physiologist Karl von Vierordt, was used by physicians in the nineteenth century as a means of observing and measuring the pulse externally and non-invasively. A clockwork mechanism allows the pulse wave forms to be traced with a mounted pen.
Size: 3664px × 4937px
Photo credit: © Science Photo Library / Alamy / Afripics
License: Licensed
Model Released: No
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