Electric discharges in rarefied gases. 2,3,4 and 6, Geissler tubes. 1 Fluorescence of Sulphuret of calcium. 4 Nitrogen Vacuum (Spirals of Uranium Glass), 7, Hydrogen. From 'The New Popular Educator', (London, 1892). Chromolithograph.

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Electric discharges in rarefied gases. 2,3,4 and 6, Geissler tubes. 1 Fluorescence of Sulphuret of calcium. 4 Nitrogen Vacuum (Spirals of Uranium Glass), 7, Hydrogen. From 'The New Popular Educator', (London, 1892). Chromolithograph.

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Photo credit: © World History Archive / Alamy / Afripics
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Keywords: ., 1, 2, 3, 4, 6, archival, archive, calcium., chromolithograph., discharges, electric, fluorescence, gases, gases., geissler, historical, history, nitrogen, rarefied, science, sulphuret, tubes., vacuum