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Van de Graaff Generator: the metal sphere

It was Michael Faraday who discovered that whenever a small object having excess electric charge was placed inside a metal ice pail, the pail seemed to become charged immediately. Also, if the small object was conductive, then if he touched the object to the inside of the pail, the ice pail would steal ALL the excess charge from the small object. The small object became neutral and the metal pail remained charged. Very strange, no?
Van de Graaff Generator: the metal sphere

Here are some patents disclosing electrostatic generators.

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electrostatic, energy, generator