Benjamin Franklin made a kite of silk cloth.The central spar of the kite was connected to a strong silk string. The other end of the silk was connected to an iron key. He flew the kite on a day when there were thick dark clouds in the sky. He brought his knuckles near the lower end of the key, but nothing happened. However, when it started raining he brought his knuckles again near the lower end of the key. As a matter of fact he was saved from the death by electric shock. The reason is that the wet string became conductor of electricity and hence allowed the electricity to flow from clouds to the sky and then from key to the knuckles and finally through his body to earth.
This is Benjamin Franklin's experiment.