Early galvanometer, 1820s

Early galvanometer, 1820s

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Credit: KING'S COLLEGE LONDON/SCIENCE PHOTO LIBRARY

Caption: Early galvanometer. 19th-century artwork of an early form of galvanometer, a device that measures an electrical current by the magnetic deflection it produces. The electric current passes through the electromagnetic coils at lower centre. The rod suspended above the coils at centre rotates as it is deflected, allowing a reading to be taken from the dial. German physicists Johann Schweigger and Johann Poggendorff independently built the first galvanometers in 1820 and 1821. Artwork from an 1873 edition of a German book on the application of electromagnetism to the new technology of telegraphy.

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