Willem Einthoven (1860-1927), Nobel Prize-winning Dutch physiologist and inventor of clinical electrocardiography. Einthoven studied medicine in Utrecht before becoming professor of physiology at the University of Leyden in Holland. His interest in physics led him to investigate the electrical rhythms of the heart. In 1903 he invented the string galvanometer", which consisted of a tiny wire stretched across a magnet. When put on the chest the wire moved with the heart's electric rhythm and the results could be traced on a chart. Cardiologists soon developed this into a major diagnostic technique and Einthoven won the Nobel Prize for physiology or medicine in 1924."