Benjamin Franklin Conducts Kite Experiment on Electricity
In colonial Philadelphia during the Enlightenment, Benjamin Franklin pursued experiments linking lightning to electricity after observations of electrical phenomena. Assisted by his son William, Franklin constructed a kite with a metal wire and key attached to a hemp string and silk insulator. On June 10, 1752, during a thunderstorm, the kite drew electrical charge into a Leyden jar, demonstrating lightning's electrical nature. Franklin published his findings later that year, proposing the lightning rod as protection. The experiment, though its exact date has some historical debate, became iconic in popular accounts of scientific discovery.
Why it matters: The kite experiment provided empirical support for Franklin's theory that lightning is electricity, advancing understanding of atmospheric electricity. It led directly to the invention of the lightning rod, saving countless structures and lives. Franklin's work elevated American science in European eyes and influenced later electrical research.