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Pith Ball Electroscope (E-3994)
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E-3994 Pith Ball ElectroscopeA simple device for detecting the presence of electrostatic charges. A plated brass pillar mounted on base supporting two pith balls in un-spun silk.E-3994/1 Electroscope, Pith Ball, on Bakelite BaseE-3994/2 Electroscope, Pith Ball, on Plastic BaseE-3994/3 Electroscope, Pith Ball, on Metal StandE-3994/4 Electroscope, ..
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