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Galvanometer, England, 1921

A galvanometer measures small electric currents. It is sometimes used during physiological experiments studying muscle contractions. Electrodes placed upon the body pick up minute electrical impulses. These cause a string within the galvanometer to move. Movement is recorded photographically to make a tracing. The galvanometer is one of the earliest instruments used to detect and record electrical activity in the heart. It forms the basis of electrocardiograph machines.

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Glossary: cardiology

The study of diseases affecting the heart and blood vessels.

Glossary: galvanometer

An instrument for detecting and measuring small electric currents.