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Image
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Source
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Observations
from the source
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Gallenkamp
(1930s)
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Luminous
pane, for use with Wimshurst machines
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Gallenkamp
(1930s)
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Spangled
tube, for use with Wimshurst machines
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Gallenkamp
(1930s)
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Vacuum
tubes, for use with Wimshurst machines
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Gallenkamp
(1930s)
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Sand
apparatus, for use with Wimshurst machines
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