| Crookes' glass | A spectacle lens combined with metallic oxides to absorb ultraviolet or infrared rays. (05 Mar 2000) |
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| Crookes, Sir William | <person> British physicist and chemist, 1832-1919; winner of the Nobel Prise in chemistry in 1907. See: Crookes' glass, Crookes-Hittorf tube. (05 Mar 2000) |
| Crookes-Hittorf tube | A simple evacuated tube containing a cathode, that emitted X-rays from the glass envelope when a current was passed through it; the type used by Roentgen to discover X-rays. (05 Mar 2000) |