from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. An early gas discharge tube used to demonstrate the principles of electrical glow discharge.

from the GNU version of the Collaborative International Dictionary of English

  • A glass tube provided with platinum electrodes, and containing some gas under very low tension, which becomes luminous when an electrical discharge is passed through it; -- so called from the name of a noted maker in germany. It is called also Pl├╝cker tube, from the German physicist who devised it.


After Heinrich Geissler, who invented it in 1857. (Wiktionary)


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