Electricity clock
The power meter was a medical measuring device developed by Carl Ludwig in 1868 to measure the flow strength of the blood in larger arteries and veins. For this purpose, a blood vessel of the test animal was cut and the current meter was integrated between the two vessel stumps. Other scientists such as Hellmut Weese and Sigurd Janssen also constructed electric clocks at that time. In this way, the volume flow could be calculated as the quotient of volume and time. This volume flow is the product of stroke volume and heart rate . It is therefore identical to the cardiac output , which was also previously referred to as cardiac output or cardiac output . William Harvey had estimated the half-hourly volume , which was also identical .
literature
- Jan Dogiel: The measurement of the flowing blood volumes . In: "Works from the Physiological Institute in Leipzig", Hirzel 1867 Google eBook with a detailed description of Ludwig's current clock. - Ivan Michajlovic Dogel was born in Vitebsk in March 1830 and died in Kazan in August 1916 . Instead of Dogel you can also find Dogiel, instead of Iwan, depending on where you are, Jan, Jean or Johann, each with or without the addition of .
- Leopold Ther : Pharmakologische Methode, pp. 204-207, and elsewhere. Stuttgart, Scientific Publishing Company 1949
Individual evidence
- ↑ http://www.sammlungen.hu-berlin.de/dokumente/6903/ with a picture of a power clock