Crookes noun. [krʊks] L19.
[See below.]
Used attrib. and in possess. with ref. to the inventions and observations of the English physicist Sir William Crookes (1832-1919).
Crookes dark space, Crookes's dark space: between the negative glow and the cathode of a low-pressure discharge tube. Crookes glass, Crookes lens, Crookes's glass, Crookes's lens: made so as to absorb ultraviolet light. Crookes radiometer, Crookes's radiometer an evacuated globe containing four vanes which have one side blackened and jointly spin when heat radiation impinges on them. Crookes space, Crookes's space = Crookes dark space above. Crookes tube, Crookes's tube a highly evacuated electron tube in which stratified electric discharges can be produced.

[TahlilGaran] English Dictionary ▲