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Cathode-Ray Tubes
A cathode ray tube (CRT) is an electronic device that produces images on a screen by firing electrons at
phosphors coated onto the inside of the tube
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The term "cathode ray" is derived from
the fact that the electron beam within the CRT is generated by a negative electrode termed a cathode
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When electrons pass through this heated filament, they enter the vacuum within the
CRT and travel down an electrically charged line that runs through the center of its neck
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In addition to providing images, CRTs can also act as oscilloscopes for measuring electrical signals with
their bean probes
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For example, if waves are amplified
enough times they can be seen directly on screen using a probe connected to one section of it powerful
enough draw out all their points simultaneously in real-time, while measuring them at individual points
throughout their duration; thus making precise measurements possible without using costly external
equipment like spectrum analyzers
...