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What is a cathode ray?

What is a cathode ray? Here are some definitions.

Noun
  1. (electricity) A ray consisting of a stream of electrons in a vacuum tube, that are emitted by the cathode and accelerated towards the anode by an electric field.
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Examples
It is compatible with all screens from plasmas to conventional cathode ray tube screens.
This allows the metallographer to analyze the data while it is being displayed in real time on the cathode ray tube.
One member of the radio society even has a major collection of cathode ray oscilloscopes, which he displays along one complete wall in his home.
For the past 75 years, the vast majority of televisions have been built around the same technology, the cathode ray tube.
Cold cathode ray technology illuminates the instrument faces, while the indicators are backlit.
Cerium is also used in the manufacture of lasers and phosphors used in cathode ray tubes.

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