Siemens galavanometer, 1860s

Siemens galavanometer, 1860s

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Credit: KING'S COLLEGE LONDON/SCIENCE PHOTO LIBRARY

Caption: Siemens galavanometer. 19th-century artwork showing the electric circuits in a Siemens all-purpose galvanometer. A galvanometer is a device that measures an electrical current by the magnetic deflection it produces. It was first developed in the 1820s. The firm founded by German inventor Werner von Siemens developed a universal galvanometer in 1868 for use in telegraphy. Artwork from an 1873 edition of a German book on the application of electromagnetism to the new technology of telegraphy.

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