The modern lightning rod was invented by American scientist Franklin. 1752 One day in July, the wind swept away. A storm is coming. Franklin and his son William came to an open place with a kite with a metal pole on it. Franklin held the kite high, while his son flew with the kite string. Because of the strong wind, the kite was quickly put into the sky. In an instant, thunder and lightning, pouring rain. Franklin and his son hid in a building with kite string. At this moment, just a flash of lightning passed over the kite, and Franklin's hand was immediately numb with terror. He couldn't restrain his inner excitement and shouted, "I got an electric shock!" I was electrocuted! " Then he touched the kite string with a string of copper keys, and a string of electric sparks immediately appeared on the key; Later, he introduced the electricity from the kite line into the Leiden bottle. After returning home, Franklin conducted various electrical experiments with lightning captured from the sky, which proved that lightning in the sky has exactly the same properties as electricity generated by artificial friction. Franklin's hypothesis that electricity in the sky and electricity on the ground are the same thing has been well confirmed in his own experiments.
Franklin's experiment of catching lightning also had a great influence on the development of modern science at that time. On the one hand, kite experiment shows human beings the power of science to conquer nature, on the other hand, it also shows human beings their own power to conquer nature.