1791,1820 - Galvanometer - The book of science In 1791, Johann Schweigger built the first working galvanometer, coiling a wire around a magnetic needle.

In 1791, Johann Schweigger built the first working galvanometer, coiling a wire around a magnetic needle. #Poetry #Science #History #Electromagnetism #Galvanometer #Schweigger sharpgiving.com/thebookofsci...