- In 1887 Franz Exner developed this electroscope for his investigations of atmospheric electricity and later on it was also used for radiation measurements. The one shown here was produced by Max Kohl, a German manufacturer of scientific instruments. It employs two aluminum leaves, one on each side of a vertical copper plate suspended from the top of the electroscope chamber. The glass on the back of the electroscope has a scale that reads 0 in the middle and goes up to 20 on each side. Source: The Historical Instrumentation Collection, Oak Ridge Associated Universities.
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