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ベンジャミン・フランクリンの凧糸
THE CHILD'S BOOK OF NATURE. By Worthington
Hooker, M.D. 1888. Harper & Brothers, New York. In
Chapter XXX, More About Electricity, Hooker explains Benjamin
Franklin's experiment by which he discovered that lightning and
electricity are the same thing. Franklin sent his silk kite up
in a thunderstorm with a pointed iron wire attached to the kite and
the string. The silk was a non-conductor, while the string
conducted the electricity to the ground. "But he
managed to prevent the electricity from coming to his hand. He
stopped it on the way. He did this by tying a silk ribbon to the
hemp string, and holding the kite by this ribbon, as you see in the
picture. The electricity could not go through this silk, and so
it stayed in the hemp string."
FRANKLIN'S EXPERIMENT, JUNE 1752. "Demonstrating the Identity of Lightning and Electricity, From Which He Invented the Lightning Rod. From "Currier & Ives," Ed. by John L. Pratt, 1968.
"Dr. Franklin now fastened a key to the end of the hemp string. A great deal of the electricity now passed to the key, because the metal of which the key was made was so good a conductor...when Franklin put his knuckle near the key, he received a shock from it."
These experiments by Franklin suggested the use of lightning rods, which he invented. A lightning rod saved the museum curator's house, when a homemade lightning rod carried a huge bolt of lightning to a metal rod pounded eight feet into the ground. The blast was tremendous, but only two radios were lost, thanks to Ben.
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