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I'd like to thank Karl Craddock for his help with this investigation.
I have found that the traditional gold foil electroscope does not work very well for this demonstration because the pieces of foil tend to get blown around.
An Internet search for “triboelectric series” will yield many lists of materials that can charge a rod negatively.
U.S. Patent 7165341 found at describes a similar structure in more detail.
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