1) Vacuum tube display 
A Crookes tube is an early experimental electrical discharge tube, with partial vacuum, invented by English physicist William Crookes and others around 1869-1875, in which cathode rays, streams of electrons, were discovered. Developed from the earlier Geissler tube, the Crookes tube consists of a partially evacuated glass container of various shap...
• A vacuum tube in which the exhaustion is carried to a very high degree, with the production of a distinct class of effects; -- so called from W. Crookes who introduced it.
Crookes' tube` (kr??ks' t?b`). (Physics ) A vacuum tube in which the exhaustion is carried to a very high degree, with the production of a distinct class of effects; -- so called from W. Crookes who introduced it. 
[n] - the original gas-discharge cathode-ray tube
noun the original gas-discharge cathode-ray tube
a form of cathode-ray tube.