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Ruhmkorff astatic galvanometer

The term 'astatic' was invented by Ampère in 1820 for a simple galvanometer whose magnetic needle was mounted parallel with the Earth's magnetic field. The following year he devised the two-needle system with which the term became commonly associated. In 1825, Leopoldo Nobili constructed the astatic galvanometer as we now know it. The version made by Ruhmkorff in Paris became the best-known and was commonly illustrated in physics textbooks.

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