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Home > Art, Film & Photography > Dutch Physiologists: Willem Einthoven, Jan Ingenhousz, Franciscus Donders
Dutch Physiologists: Willem Einthoven, Jan Ingenhousz, Franciscus Donders

Dutch Physiologists: Willem Einthoven, Jan Ingenhousz, Franciscus Donders


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About the Book

Chapters: Willem Einthoven, Jan Ingenhousz, Franciscus Donders. Source: Wikipedia. Pages: 18. Not illustrated. Free updates online. Purchase includes a free trial membership in the publisher's book club where you can select from more than a million books without charge. Excerpt: Willem Einthoven (Semarang, May 21, 1860 Leiden, September 29, 1927) was a Dutch doctor and physiologist. He invented the first practical electrocardiogram (ECG or EKG) in 1903 and received the Nobel Prize in Medicine in 1924 for it. Einthoven was born in Semarang on Java in the Dutch East Indies (now Indonesia). His father, a doctor, died when Einthoven was a child. His mother returned to the Netherlands with her children in 1870 and settled in Utrecht. In 1885, Einthoven received a medical degree from the University of Utrecht. He became a professor at the University of Leiden in 1886. Before Einthoven's time, it was known that the beating of the heart produced electrical currents, but the instruments of the time could not accurately measure this phenomenon without placing electrodes directly on the heart. Beginning in 1901, Einthoven completed a series of prototypes of a string galvanometer. This device used a very thin filament of conductive wire passing between very strong electromagnets. When a current passed through the filament, the electromagnetic field would cause the string to move. A light shining on the string would cast a shadow on a moving roll of photographic paper, thus forming a continuous curve showing the movement of the string. The original machine required water cooling for the powerful electromagnets, required 5 people to operate it and weighed some 600 lb. This device increased the sensitivity of the standard galvanometer so that the electrical activity of the heart could be measured despite the insulation of flesh and bones. An early ECG deviceAlthough later technological advances brought about better and more portable EKG de...More: http: //booksllc.net/?id=37023


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Product Details
  • ISBN-13: 9781158374434
  • Publisher: Books LLC
  • Publisher Imprint: Books LLC
  • Height: 152 mm
  • No of Pages: 20
  • Spine Width: 1 mm
  • Weight: 45 gr
  • ISBN-10: 1158374437
  • Publisher Date: 15 Sep 2010
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Sub Title: Willem Einthoven, Jan Ingenhousz, Franciscus Donders
  • Width: 229 mm


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