The modern lightning rod was invented by Franklin, an American scientist. Franklin thought Lightning was a discharge phenomenon. To prove it, on a rainy day in July 1752, he risked being struck by lightning to fly a kite with long metal wires into a thunderstorm cloud and tie a string of silver keys at the end of the wire. When the lightning struck, Franklin's hand approached the key and a string of electric sparks burst out of the key. There is also a sense of numbness on the hands.
Fortunately, the lightning that passed down this time was weaker, and Franklin was unhurt. Note: This test is very dangerous, do not try without permission.
In the 1753, Lihman, a famous Russian electrician, was tragically electrocuted by lightning in order to verify Franklin's experiment, the first victim of a lightning experiment. After successfully carrying out a kite experiment to catch Lightning, Franklin, in studying the consistency of electricity generated by lightning and artificial friction, made the conjecture from the analogy that since artificially generated electricity is absorbed by the tip, lightning can also be absorbed by the tip. He thus designed the kite experiment, and the success of the kite experiment, in turn, confirmed his conjecture. He thus envisaged that if a cutting-edge device could be placed on a high object, it would be possible to bring lightning into the ground. Franklin put the Lightning arresters: Fixed a thin iron bar several meters long at the top of a tall building, separated by an insulator between the iron bar and the building. Then connect the bottom of the iron bar with a wire. The wire is then introduced into the ground. Franklin referred to the Lightning arresters as a lightning rod. After the trial, it can really play the role of lightning avoidance.
The invention of lightning rod is the first technical achievement with great application value in early electrical research.
North American spread
And when the lightning rod was first invented and popularized, the church regarded it as ominous, saying that it was loaded with Franklin's kind of thing, not only can not avoid lightning, but will cause the wrath of God and was struck by lightning, but in Philadelphia and other places, refused to place the lightning rod of some high cathedrals in the thunderstorm successively suffered lightning strikes.
The building, which is taller than the church, was unharmed in the thunderstorm because it had been fitted with a lightning rod.
As the lightning rod had begun to manifest itself in Philadelphia and other places, it immediately spread across North America and then into Europe before entering Asia.
Introduced to France
After the lightning rod was introduced to France, Fort Norey, dean of the Royal French Academy of Sciences, and others began to oppose the use But the French still chose Franklin's pointed lightning rod. It is said that the French at that time regarded Franklin as the embodiment of Socrates. Franklin became an idol adored by people. His portrait was treasured under his pillow, and the steeple hat, modeled after the Lightning rod, became the most modern hat in Paris for 1778.
Were introduced to England
After the lightning rod was introduced into England, the British also widely adopted Franklin's pointed lightning rod. But after the outbreak of the American War of Independence, Franklin's pointed lightning rod seemed to the British to become a symbol of the American being to be born. It is said that the British then king, George II, out of opposition to the American Revolution, had ordered the tip of the lightning rod on all of Britain's rear buildings to be replaced with round heads, in order to be at odds with the pointed lightning rod as a symbol of the United States, which is really an interesting thing in the history of lightning rod applications.