Condensing Electroscope

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“An instrument for observing or detecting the existence of free electricity, and, in general, for determining its kind. ... In Volta’s condensing electroscope, in place of the gilt knob there is a flat metal plate upon which rests another similar plate, which may be removed by an insulating handle.” -Whitney, 1911

Source

William Dwight Whitney The Century Dictionary: An Encyclopedic Lexicon of the English Language (New York, NY: The Century Co., 1911)

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