LYCOS RETRIEVER 
Cathode Ray Tube: Beams
built 237 days ago
While many scientists were busy trying to unlock the secrets of cathode rays, others were searching for ways to apply them toward practical ends. The first such application came in 1897 in the form of Karl Ferdinand Braun's oscilloscope. This device used a cathode ray tube to produce luminescence on a chemically treated screen. The cathode rays were allowed to pass through a narrow aperture, effectively focusing them into a beam which appeared on the screen as a dot. The dot was then made to "scan" across the screen according to the frequency of an incoming signal. An observer viewing the oscilloscope's screen would then see a visual representation of an electrical pulse.
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The cathode ray tube is a vacuum tube, produced without a vacuum pump, and it's made from only a 1/2" dia. clear acrylic tubing and two rubber stoppers and 2 household pins. It sends an eerie blue beam dancing between the two electrodes. You can plainly see the Faraday Dark Space at the cathode end. Place magnets on the side of the tube and the beam will bend ! This project only costs $2-3 and has only three main parts.
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CRTs can emit a small amount of X-ray radiation as a result of the electron beam's bombardment of the shadow mask/aperture grille and phosphors. The amount of radiation escaping the front of the monitor is widely considered unharmful. The Food and Drug Administration regulations in 21 C.F.R.
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The electron gun assembly consists of a heated metal cathode surrounded by a metal anode. The phosphor viewing surface is a thin layer of material which emits visible light when struck by an electron beam. The glass envelope consists of a relatively Rat face plate, a funnel section, and a neck section.
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The CRT works by heating a cathode which causes electrons to flow. Accelerating and focusing anodes turn the electrons into a fine beam that is directed to the phosphors by magnetic fields that are generated by steering coils. The viewing end of a color CRT tube is coated with red, green and blue phosphor dots, and separate "electron guns" bombard their respective colors a line at a time in a prescribed sequence (see raster scan).
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