Un nouveau galvanomètre.

Einthoven directed much of his research to the development and perfection of recording instruments. His most famous work was in connexion with his string galvanometer, a perfection of the instrument invented by J. S. C. Schweigger, of Halle.

In 1924 Einthoven was awarded the Nobel Prize in Physiology or Medicine for "for his discovery of the mechanism of the electrocardiogram."  See also No. 842.