Definition of Van de Graaff generator
: an apparatus for the production of electrical discharges at high voltage commonly consisting of an insulated hollow conducting sphere that accumulates in its interior the charge continuously conveyed from a source of direct current by an endless belt of flexible nonconducting material
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Merriam-Webster unabridged
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Time Traveler for Van de Graaff generator
The first known use of Van de Graaff generator was in 1937
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