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Geissler tube

[gahys-ler] /ˈgaɪs lər/
noun
1.
a sealed glass tube with platinum connections at the ends, containing rarefied gas made luminous by an electrical discharge.
Origin
1865-1870
1865-70; named after H. Geissler (1814-79), German inventor
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for Geissler tube

Geissler tube

/ˈɡaɪslə/
noun
1.
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
Word Origin
C19: named after Heinrich Geissler (1814–79), German mechanic
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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