Pith-Ball Electroscope
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“An instrument for observing or detecting the existence of free electricity, and, in general, for determining its kind. ... The simplest electroscope consists of pith-balls suspended by silk threads.” -Whitney, 1911
Keywords
electricity, pith-ball electroscope, science instrument, free electricity, measuring instrumentSource
William Dwight Whitney The Century Dictionary: An Encyclopedic Lexicon of the English Language (New York, NY: The Century Co., 1911)
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