Watch Electricity Attract Pith Balls Like a Magnet! Our Classic Pith Ball Electroscope is as simple as it gets, but also of the most compelling demonstrations of electrostatic attraction. Place Pith Ball Electroscope near any source of static or high voltage. This could be an old CRT TV screen, fleece rubbed with a balloon or an electrostatic machine such as a Van de Graaff generator or Wimshurst. The Pith (plant material, think natural styrofoam) balls will be attracted to some charges and repelled by others. This was one of the very first instruments for measuring the presence of electricity.
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