Quadrant Electroscope

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“An instrument for observing or detecting the existence of free electricity, and, in general, for determining its kind. ... Quadrant electroscope, a form of pith-ball electroscope which serves to measure roughly the degree of electrification by the rise of the pith-ball as indicated by the motion of the rod carrying it on a graduated semicircle.” -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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