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Lightning Rods

المؤلف:  GEORGE A. HOADLEY

المصدر:  ESSENTIALS OF PHYSICS

الجزء والصفحة:  p-244

2025-11-30

610

Franklin's invention of the lightning rod was the natural outcome of his experiment with the kite. The function of the lightning rod is not to attract a stroke of lightning, but to reduce the potential difference between the clouds and the earth by a quiet discharge. To secure this, the rod must be well supplied with points at the top and must make a permanent connection with the damp earth below. Copper sheets fastened to the lower. end of the rod make a good earth connection. If a full lightning discharge from the clouds to the earth should strike a lightning rod, the building might be damaged, just as Dr. Franklin might have been killed had lightning struck his kite.