The story of Franklin's invention of lightning rods Franklin's most famous discovery was the unification of the sky power and the geoelectricity, breaking the people's superstition about thunder and lightning. During the discharge experiment with the Leiden flask, Franklin faced the flashes and buzzes of electric sparks and could not help but associate it with the lightning of the sky. He realized that the spark of the Leiden flask might be a kind of small lightning. . In order to verify this idea, the lightning in the sky must be led to the ground. On a thunderstorm in July 1752, Franklin made a large kite with silk. A thin wire was placed on the top of the kite, and the wire was connected to the ground with a wire. A copper key was placed on the end of the wire. The key was inserted into a Leiden bottle. Franklin put the kite up in the sky and thundered and threw it down, and saw all the hairy hairs on the silk thread upright. He took his hand close to the copper key and issued an electric spark. Tiandian was finally caught. Franklin found that the Leiden bottles that store the sky electricity produced all the phenomena that electricity could produce. This proves that the sky electricity is the same as the ground electricity. In 1747, Franklin discovered from the Leiden flask experiment that the cutting edge was more likely to be discharged. When he discovered the unity of the sky electricity and the earth electricity, he immediately thought of using the sophisticated discharge principle to introduce the powerful thunder and lightning into the ground. To avoid lightning strikes on buildings. In 1760, Franklin erected a lightning rod on a building in Philadelphia. The effect was very significant.
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