<Tr> <Td> </Td> <Td> This article needs additional citations for verification . Please help improve this article by adding citations to reliable sources . Unsourced material may be challenged and removed . (February 2011) (Learn how and when to remove this template message) </Td> </Tr> <P> Cathode rays (also called an electron beam or e-beam) are streams of electrons observed in vacuum tubes . 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 and traveling away from the cathode (the electrode connected to the negative terminal of the voltage supply). They were first observed in 1869 by German physicist Johann Wilhelm Hittorf, and were named in 1876 by Eugen Goldstein Kathodenstrahlen, or cathode rays . In 1897, British physicist J.J. Thomson showed that cathode rays were composed of a previously unknown negatively charged particle, which was later named the electron . Cathode ray tubes (CRTs) use a focused beam of electrons deflected by electric or magnetic fields to create the image on a television screen . </P> <P> Cathode rays are so named because they are emitted by the negative electrode, or cathode, in a vacuum tube . This contrasts with cations, positively charged ions which are also found in some vacuum tubes and are attracted toward the cathode . To release electrons into the tube, they first must be detached from the atoms of the cathode . In the early cold cathode vacuum tubes, called Crookes tubes, this was done by using a high electrical potential between the anode and the cathode to ionize the residual gas in the tube; the ions were accelerated by the electric field and released electrons when they collided with the cathode . Modern vacuum tubes use thermionic emission, in which the cathode is made of a thin wire filament which is heated by a separate electric current passing through it . The increased random heat motion of the filament knocks electrons out of the surface of the filament, into the evacuated space of the tube . </P> <P> Since the electrons have a negative charge, they are repelled by the cathode and attracted to the anode . They travel in straight lines through the empty tube . The voltage applied between the electrodes accelerates these low mass particles to high velocities . Cathode rays are invisible, but their presence was first detected in early vacuum tubes when they struck the glass wall of the tube, exciting the atoms of the glass and causing them to emit light, a glow called fluorescence . Researchers noticed that objects placed in the tube in front of the cathode could cast a shadow on the glowing wall, and realized that something must be travelling in straight lines from the cathode . After the electrons reach the anode, they travel through the anode wire to the power supply and back to the cathode, so cathode rays carry electric current through the tube . </P>

Where did the term cathode ray come from