Question

Explain the experiment counted by Benjamin Franklin that stood spark share some simalrity with lighting.?

Answer 1

Franklin's kite experiment was performed in Philadelphia in June 1752, according to the account by Priestly.Franklin described the experiment in the Pennsylvania Gazette in October 19, 1752,without mentioning that he himself had performed it.This account was read to the Royal Society on December 21 and printed as such in the Philosophical Transactions.A more complete account of Franklin's experiment was given by Joseph Priestley in 1767, who presumably learned the details directly from Franklin, who was in London at the time Priestley wrote the book.
Franklin realized the dangers of using conductive rods and instead used the conductivity of a wet hemp string attached to a kite. This allowed him to stay on the ground and the kite was less likely to electrocute him. According to the account, Franklin kept the silk string of the kite dry at his son's end to insulate him while the hemp string to the kite was allowed to get wet in the rain to provide conductivity. A house key belonging to Benjamin Loxley was attached to the hemp string and connected to a Leyden jar; a silk string was attached to this, held by Franklin's son William who flew the kite (while standing inside a doorway to keep himself and the silk string dry). Franklin assumed that the Leyden jar would accumulate electricity from the lightning. The kite was not struck by visible lightning; had it done so, Franklin would almost certainly have been killed. However, Franklin did notice that loose threads of the kite string were repelling each other and deduced that the Leyden jar was being charged. He moved his hand near the key and observed an electric spark,proving the electric nature of lightning.