Einthoven galvanometer

This galvanometer can be seen in the Charité in Berlin. The string galvanometer, developed by the physiologist Willem Einthoven (1860-1927), served for the measurement of lowest electrical currents of the heart, the nerves as well as the brain. It belonged to the most important apparatus in electrophysiology and consists of a quarts string with string mounting, an electromagnet and a microscope for the observation of the string. The electrical current deflects the string depending on the amperage.1

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