In 1750 Benjamin Franklin published a proposal for an experiment to prove that lightning was caused by electricity by flying a kite in a storm that appeared capable of becoming a lightning storm. It is not known whether Franklin ever performed his experiment, but on May 10, 1752, Thomas-François Dalibard of France conducted a similar experiment using a 40 feet (12 m) iron rod instead of a kite and extracted electrical sparks from a cloud.
Franklin understood the threats of utilizing conductive bars and rather utilized his son to fly the kite. This enabled him to remain on the ground and the kite was likely to electrocute him. According to the legend, Franklin kept the string of the kite dry at his son’s conclusion to insulate him while he was permitted to get wet in the rain to give conductivity.
A house key belonging to Benjamin Loxley was attached to the string and connected to a Leyden jar, which Franklin assumed would accumulate electricity from the lightning. The kite was not struck by noticeable lightning; had it done as such, Franklin would more likely than not have been executed. Be that as it may, Franklin noticed that the strings of the kite were repulsing each other and deduced that the Leyden jar was being charged. He moved his hand close to the key a short time later because as he had estimated, lightning had contrarily charged the key and the Leyden jar, demonstrating the electric idea of lightning.