Definify.com
Webster 1913 Edition
Geissler tube
Geis′sler tubeˊ
.(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.