Galvanometrische registratie van het menschelijk electrocardiogram IN: Herinneringsbundel Prof. S.S. Rosenstein, pp.101-106.

First description of Einthoven's string galvanometer that recorded electrical changes occurring in the human heart. Includes the first illustration of an EKG (ECG) recording. Modern electrocardiography became a reality through his work, and the string galvanometer finally displaced the capillary electrometer in the measurement of the electric current produced by the contracting heart. See also No. 840.