Geis″sler tube′ (?). (Elec.) 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 Plücker tube, from the German physicist who devised it.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.