String galvanometer
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A string galvanometer is a sensitive fast-responding measuring instrument that uses a single fine filament of wire suspended in a strong magnetic field to measure small currents. In use, a strong ligh
An early commercial ECG machine, built in 1911 by the Cambridge Scientific Instrument Company
Schema of Einthoven galvanometer, with quartz filament marked a-a'- 1903
Willem Einthoven
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Willem Einthoven was a Dutch medical doctor and physiologist. He invented the first practical electrocardiograph in 1895 and received the Nobel Prize in Physiology or Medicine in 1924 for it.
String galvanometer
…from the heart and produced the first electrocardiogram in 1887. But his equipment was slow. Physiologists worked to find a better instrument. In 1901, Willem Einthoven described the science background and potential utility of a string galvanometer, stating "Mr. Adair has already built an instrument with a wires stretched…
Willem Einthoven in 1906