Pith Ball Electroscope “Long” is perfect for classroom demonstration. It consists of a pair of pith Ball suspended by threads from a U-shaped brass wire mounted on a base with rubber feet.more...
We have mounted an insulated stand on a solid round base. Over the hook at the stands end you dangle a silk thread with a light pith ball attached to each end. Pith balls react sensitively to static charges like those from a charged friction rod. Comes with 3 strings and six 8mm.more...
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