karl von vierordt

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v. born July 1, 1818, Lahr, Baden died Nov. 22, 1884, Tübingen, Ger. German physician. He started a medical practice in 1842 and began teaching at the University of Tübingen in 1849. He discovered a way to make an exact red-blood-cell count (see blood analysis) and invented the sphygmograph, the first instrument to produce a pulse tracing, and the hemotachometer, which monitors blood flow velocity
karl von vierordt