How does the electron gun inside a TV work, and why is it called an “electron gun”?

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If you have read How Television Works or watched What If I Shot My TV?, then you have heard about electron guns. They sound a little bit like something out of “Star Wars,” but they’re actually the devices that are the heart of most TVs and computer monitors.

from Pocket http://electronics.howstuffworks.com/question694.htm
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