Standard ampere, 1900s

Standard ampere, 1900s

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Caption: Standard ampere. Historical illustration of the electrodynamometer designed by French physicist Joseph Solange Henri Pellat (1850-1909) and built by Carpentier for measurements relating to the international standard (SI) for the ampere, the unit of electric current. These standards were established by the International Bureau of Weights and Measures (BIPM) at Sevres, France. The Pellat method shown here remained the standard way to measure the ampere for many years. Artwork from 'Electricite' (1911) by Max de Nansouty, part of the 'Les merveilles de la science' series of 1867-1891 by Louis Figuier.

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