"cathode ray." YourDictionary, n.d. Web. 05 December 2018. <https://www.yourdictionary.com/cathode-ray>.
cathode ray. (n.d.). Retrieved December 05th, 2018, from https://www.yourdictionary.com/cathode-ray
(plural cathode rays)
In the early part of the 20th century, it was the first name given to electron beams emitted from a negatively charged cathode in a vacuum tube. The term has been used ever since. See CRT.
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