Benjamin Franklin (1706-1790) and his son William, performing their famous experiment on 15 June 1752, flying a kite in a thunderstorm. A metal wire on the kite attracted a lightning strike and electricity flowed down the string to a key, charging a Leyden jar (capacitor) seen near Franklin's hand. This experiment proved that lightning was an electrical phenomenon, and supported Franklin's invention of lightning rods. From Les Merveilles de la Science, published 1870.

Benjamin Franklin (1706-1790) and his son William, performing their famous experiment on 15 June 1752, flying a kite in a thunderstorm. A metal wire on the kite attracted a lightning strike and electricity flowed down the string to a key, charging a Leyden jar (capacitor) seen near Franklin's hand. This experiment proved that lightning was an electrical phenomenon, and supported Franklin's invention of lightning rods. From Les Merveilles de la Science, published 1870.

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