The Crookes tube is an early experimental electrical discharge tube with partial vacuum. the Crookes tube is a type of cathode ray tube which was named after sir Williams Crookes who is known for his studies on electrons via the Crookes tube.Developed from the earlier Geissler tube, the Crookes tube consists of a partially evacuated ( meaning does not contain anything like a space vacuum) glass container of various shapes, with two metal electrodes, the cathode And the anode, one at either end.Crookes tube functions when a high voltage between the electrodes in the Crookes tube the cathode rays(electrons) are projected in straight lines in the cathode tube.
While working in a darkened laboratory William Crookes noticed a green glow from one of his cathode ray tubes, the green light was produced from a form of radiation striking zinc-sulfide coalition that had been applied to the end of the tube. this ray was called a cathode ray and this accidental discovery made by Crookes led to the discovery of television. In 1861 while while conducting a spectroscopic examination of the residue left in the manufacture of sulfuric acid sir William Crookes managed to follow up on the green light to isolate a new element Thallium. for the sake of accuracy Sir William Crookes tried to weigh the new element in a vacuum. and even in these circumstances he found that the balance behaved in an unexpected manner because the metal appeared to be heavier to colder than when hot. so then he explained this phenomenon as a "repulsion from radiation", and he expressed his discovery in the statement that in a vessel exhausted of air a body tends to move away from another body hotter than itself. Utilizing this principle he built the radiometer which is used to measure or detect radiant energy.
J.J Thomson short for sir Joseph John Thomson is accredited for the discovery and identification of electrons. he found electrons by experiments in which he tried to separate the electrical particles from the ray that was sent out by an electron gun of a cathode ray tube.
