Geissler tube

Geissler tube

[gahys-ler]
noun
a sealed glass tube with platinum connections at the ends, containing rarefied gas made luminous by an electrical discharge.

Origin:
1865–70; named after H. Geissler (1814–79), German inventor

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World English Dictionary
Geissler tube (ˈɡaɪslə)
 
n
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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