LYCOS RETRIEVER 
Cathode Ray Tube: Electrons
built 280 days ago
Cathode ray tubes were the primary electronic information display device for over half a century. Even today they remain dominant as the picture tube in television receivers. Moreover, much of the world continues to use them as computer monitors. The secret to their success is their amazing flexibility and their low cost. They can be made in almost any size, with screens ranging from .5 inches to 50 inches. They can display an immense amount of information per second.
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Cathode-ray tubes differ in their details of construction depending on the use to which they will be put. In an oscilloscope, for example, the electron beam has to be able to move about on the screen very quickly and with high precision, although it needs to display only one color. Factors such as size and durability are ... more important in an oscilloscope than they might be in a home television set. In a commercial television set, on the other hand, color is obviously an important factor. In such a set, a combination of three electron guns is needed—one for each of the primary colors used in making the color picture.
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Karl Ferdinand Braun [A] German physicist, interested in the just discovered Cathode rays worked and experimented with Crookes tubes. When he was working at the Physics Institute of the Strasbourg University (from 1895-1918) he developed the first cold Cathode Ray tube with magnetically beam deflection (the effect discovered by Plucker and Hittorf in 1869) and a mica screen covered with phosphor to produce a visible spot. The tube, build for him by Franz Müller successor of Geissler was called after its inventor, the Braun tube. Braun used this tube as an indicator tube for studying the effects of Cathode rays in order to visualize alternating currents and described this 1897, this was in fact the first oscilloscope. JJ.Thomson used a similar tube design in his experiments to show the existence of the electron at almost at the same time. Harris J Ryan introduced this tube in 1903 in the USA as an alternating current wave indicator, known as the Braun-Ryan tube.
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During the first three decades of the twentieth century, inventors continued to devise uses for cathode ray technology. Inspired by Braun's oscilloscope, A. A. Campbell-Swinton suggested that a cathode ray tube could be used to project a video image upon a screen. Unfortunately, the technology of the time was unable to match Campbell-Swinton's vision. It was not until 1922 that Philo T. Farnsworth used a magnet to focus a stream of electrons onto a screen, producing a crude image. Though the first of its kind, Farnsworth's invention was quickly superseded by Vladimir Zworykin's kinescope, the ancestor of the modern television.
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A cathode ray tube is basically an electron gun. It is a vacuumed glass container with a cathode (an electrode with negative charge) at one end. The heater is similar to a light bulb; it heats up and releases electrons. The cathode repels the electrons in the direction of the screen because they are ... negatively charged. The anodes which are charged positive cause even more acceleration by attracting the electrons towards the screen.
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A cathode ray tube has a cathode or negatively charged terminal. In a cathode ray tube, this terminal is a heated filament, much like the filament seen in a light bulb. The filament is contained inside a vacuum within a glass tube. Inside the tube, a beam of electrons is allowed to flow from the filament into the vacuum. The flow of the electrons is natural, not forced.
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