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E. Kidson and H. F. Johnston making atmospheric electricity observations
on board the magnetic survey vessel Carnegie, spring 1911. Photo courtesy
of the Department of Terrestrial Magnetism, Carnegie Institution of Washington.
R. C. Meyer with 2-meter Van de Graaff generator at the Department of
Terrestrial Magnetism, April 16, 1936. Photo courtesy of the Department
of Terrestrial Magnetism, Carnegie Institution of Washington.
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