WILLIAM D. REID, M.D., F.A.C.P.; SAMUEL H. CALDWELL, Sc.D.
A modified apparatus1 and technic2 for obtaining electrocardiograms was reported in 1932. This paper reports the further development of the apparatus and its use in electrocardiographic research.
The introduction of the string galvanometer by Einthoven in 1903 marked a great advance in the methods of recording rapid changes of small electric currents. In most electrical engineering applications, however, the string galvanometer has been largely displaced by the oscillograph. The latter instrument although by no means as sensitive as the string galvanometer is of a more sturdy design and can be adapted to give larger scale
REID WD, CALDWELL SH. RESEARCH IN ELECTROCARDIOGRAPHY(RESEARCH IN ELECTROCARDIOGRAPHY*). Ann Intern Med. 1933;7:369–380. doi: 10.7326/0003-4819-7-3-369
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Published: Ann Intern Med. 1933;7(3):369-380.
Cardiac Diagnosis and Imaging, Cardiology.
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