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I will find out who our labtech uses, we have catalogues at work which should have them in it. If you cannot find one they would be easy to construct if you are handy. A sheet of perspex, some lithoplate and glue, copper brushes and a bit of 10mm rod would just about do it. Like the Vandergraph these contraptions do not work well in humid weather so it needs to be nice and dry to get the best out of them.
Mark
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