Geissler tube : 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 Plucker tube, from the German physicist who devised it.

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Taxonomy
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Defination from the web:
Geissler tube was an evacuated glass cylinder with an electrode at each end. ... Geissler and Crookes tubes shown working. How to Make an Experimental Geissler Tube, Popular Science monthly, February 1919, Unnumbered page, Scanned by Google Books: http://books.google. ...