Stock Photo - Lemonnier researching electrical speed, seen here conducting an experiment by sending a current from a Leyden jar through a wire approx 1,850 m long, he concluded that electricity propagated ""instantaneously"" in the wire. Louis-Guillaume Le Monnier aka Lemonnier, 1717 - 1799. French natural scientist. From Les Merveilles de la Science, published 1870.

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