Geissler tube noun phr. ['gʌɪslǝ tju:b] Also Geissler's tube. M19.
[from Heinrich Geissler (1814-79), German glass-blower.]
A sealed glass or quartz tube with a narrow central section, filled with gas at low pressure, for the production of visible or ultraviolet light by electrical discharge (esp. for spectral analysis).

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