F. LOWELL DUNN, M.D., F.A.C.P.; WALTER E. RAHM JR.
Thomas Lewis in the introduction to his "Mechanism and Graphic Registration of the Heart Beat" emphasized that scientific advancement depends upon the development of suitable instrumentation.1 In the pioneer days of Einthoven and Lewis the problem was to design and construct an instrument which would permit a study of what has become electrocardiography. Einthoven's contribution was to adapt the tight string instrument originated by Ader for submarine telegraphic purposes to the requirements of cardiac electrophysiology.2 Einthoven pointed out the marked superiority of the new string galvanometer to the older capillary electrometer—the time saved in making records and the avoidance of
DUNN FL, RAHM WE. ELECTROCARDIOGRAPHY: MODERN TRENDS IN INSTRUMENTATION AND VISUAL AND DIRECT RECORDING ELECTROCARDIOGRAPHY1. Ann Intern Med. 1950;32:611–626. doi: 10.7326/0003-4819-32-4-611
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Published: Ann Intern Med. 1950;32(4):611-626.
Cardiac Diagnosis and Imaging, Cardiology.
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