Einthoven, Willem (1860-1927), a Dutch physiologist, was the founder of electrocardiography. In 1903, he invented the string galvanometer, which records variations of electrical current. With his galvanometer, he was able to record the minute electrical impulse that travels through the heart with every beat. Modern electrocardiography is the direct outcome of papers published by Einthoven in 1907 and 1908 (see Electrocardiograph).