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  • Title: Early detectors of the heart's electrical activity.
    Author: Breathnach CS, Westphal W.
    Journal: Pacing Clin Electrophysiol; 2006 Apr; 29(4):422-4. PubMed ID: 16650272.
    Abstract:
    It was in Matteucci's rheoscopic frog in Pisa that evidence was first found for the electrical activity of the heart in 1844, and his results were confirmed and expanded 12 years later at Würzburg. The capillary electrometer gave a continuous record that could be photographed, and was used initially by Einthoven who, to obviate the onerous mathematical conversion of the electrometer record, developed the string galvanometer by the close of the century, and showed its clinical value in 1906.
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