Geissler tube

a sealed glass tube with platinum connections at the ends, containing rarefied gas made luminous by an electrical discharge.

1865–70; named after H. Geissler (1814–79), German inventor Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
Geissler tube (ˈɡaɪslə)
a glass or quartz vessel, usually having two bulbs containing electrodes separated by a capillary tube, for maintaining an electric discharge in a low-pressure gas as a source of visible or ultraviolet light for spectroscopy
[C19: named after Heinrich Geissler (1814--79), German mechanic]

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