The Maltese cross has no external electrical connection.Ĭathode rays are so named because they are emitted by the negative electrode, or cathode, in a vacuum tube. Cathode-ray tubes (CRTs) use a focused beam of electrons deflected by electric or magnetic fields to render an image on a screen.ĭescription A diagram showing a Crookes tube connected to a high voltage supply. Thomson showed that cathode rays were composed of a previously unknown negatively charged particle, which was later named the electron. They were first observed in 1859 by German physicist Julius Plücker and Johann Wilhelm Hittorf, and were named in 1876 by Eugen Goldstein Kathodenstrahlen, or cathode rays. If an evacuated glass tube is equipped with two electrodes and a voltage is applied, glass behind the positive electrode is observed to glow, due to electrons emitted from the cathode (the electrode connected to the negative terminal of the voltage supply). Cathode rays are normally invisible in this Teltron tube demonstration, enough gas has been left in the tube for the gas atoms to luminesce when struck by the fast-moving electrons.Ĭathode rays or electron beams ( e-beam) are streams of electrons observed in discharge tubes. JSTOR ( February 2011) ( Learn how and when to remove this template message)Ī beam of cathode rays in a vacuum tube bent into a circle by a magnetic field generated by a Helmholtz coil. ![]() ![]() Unsourced material may be challenged and removed. Please help improve this article by adding citations to reliable sources. This article needs additional citations for verification.
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