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the sphygmograph..and the hemotachometer.
Karl von Vierordt was a German physician. He studied at the universities of Berlin, Göttingen, Vienna, and Heidelberg, and began a practice in Karlsruhe in 1842. In 1849 he became a professor of theoretical medicine at the University of Tübingen, and in 1853 a professor of physiology.
Vierordt developed techniques and tools for the monitoring of blood circulation. He is credited for the construction of an early "hemotachometer", an apparatus for monitoring the velocity of blood flow. Also, a device called a sphygmograph was created in 1854 by Vierordt. It was a mechanism consisting of weights and levers used to estimate blood pressure, and is considered a forerunner of the modern sphygmomanometer. One of his better known written works was a treatise on the arterial pulse titled Die Lehre vom Arterienpuls im gesunden und kranken Zustände.
Vierordt also made substantial contributions to the psychology of time perception, via his book (published in 1868) Der Zeitsinn nach Versuchen, "The experimental study of the time sense". This reported a large number of experiments on the perception of duration, with the time sense being considered a "general sense" along with the perception of space, in contrast to the "special senses" such as vision and hearing. Included in this book is discussion of, and evidence for, what has come to be known as Vierordt's Law: roughly the proposition that short durations tends to be overestimated, while long durations tend to be underestimated.
Between these two extremes is a "point of indifference" where the "time sensation", in Vierordt's terminology, corresponds exactly to physical time. However, the 1868 book does much more than report this "law", and contains extensive discussions of different methods used to measure duration perception, as well as different sorts of errors that can occur. Although Vierordt was not the first person to carry out experiments on time perception, his 1868 book involved much more extensive experimentation and discussion than had been carried out up until that time.
Siegfried von Basch In 1870 von Basch was appointed assistant lecturer in experimental pathology at the University of Vienna and in 1877 as an assistant professor. In 1881 he developed the sphygmomanometer, a medical instrument for measuring blood pressure. Von Basch was elevated in the peerage by Emperor Franz Josef for his share in the company of Maximilian in Mexico.
Von Basch studied at the Universities of Prague and Vienna. In 1857 he studied chemistry at the laboratory of Ernst Wilhelm von Brucke in Vienna, five years later he began his medical practice and in 1865 he served successively as assistant at the lectures of various professors at the University of Vienna. Following Von Basch was appointed principal surgeon in the military hospital in Puebla in Mexico and soon hereafter he was appointed as a member of the medical staff of Maximilian of Mexico, which in 1864 by his brother Joseph and French voice of Napoleon III of France to the Emperor Mexico was appointed.
The subject about Siegfried von Basch is translated from the Dutch Wikipedia
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editor: H.m.Hanse copyright in accordance with the GNU licence