Atmospheric Electricity
المؤلف:
GEORGE A. HOADLEY
المصدر:
ESSENTIALS OF PHYSICS
الجزء والصفحة:
p-341
2025-11-30
23
No one who has observed both the discharge of frictional electricity and lightning has failed to notice the similarity between them. Their identity was proved by Franklin in 1752. His method of proof was one that would not be followed at the present time on account of the danger to the experimenter. What he did was to fly a kite in the face of an advancing thunderstorm. A pointed wire was fastened to the top of the kite, and a short strip of silk was tied to the kite string. At the junction between the kite string and the silk strip a door key was tied. As long as the kite string was dry, no results were obtained, but as soon as it became wet with the rain (making it a better conductor), Franklin found it possible to draw sparks from the key by bringing his finger near it.
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