Engraving depicting a Geissler tube, an early gas discharge tube used to demonstrate the principles of electrical glow discharge, similar to modern neon lighting. Invented by Heinrich Geißler (1814-1879) a German glassblower, physicist and inventor. Dated 19th Century

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Size: 8556px × 2451px
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Photo credit: © World History Archive / Alamy / Afripics
License: Licensed
Model Released: No

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