The string galvanometer was one of the earliest instruments capable of detecting and recording the very small electrical currents produced by the human heart and provided the first practical Electrocardiogram (ECG). The original machines achieved "such amazing technical perfection that many modern day electrocardiographs do not attain equally reliable and undistorted recordings".
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“Supposing everyone lived at one time what would they say. They would observe that stringing string beans is universal.”
—Gertrude Stein (1874–1946)