The first discovery of a subatomic particle was a result of experiments into the nature of the relationship between electricity and matter.

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This page titled 4.11: Cathode Ray Tube is shared under a CK-12 license and was authored, remixed, and/or curated by CK-12 Foundation via source content that was edited to the style and standards of the LibreTexts platform.

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The first cathode ray tube prototype was developed by Heinrich Geissler, a German glassblower and physicist. He used a mercury pump to create a vacuum in a tube. Geissler explored a number of techniques to remove air from the tube and to prevent leaks, as well as ways to get good connections of the wires in the tubes.

In 1878, Sir William Crookes, a British scientist, displayed the first cathode rays using a modification of the Geissler apparatus. His major contribution to construction of the tube was to develop ways to evacuate almost all the air from the tube. Crookes also carried out many experiments using more reliable equipment to confirm earlier findings about the properties of cathode rays. He made two discoveries which supported the hypothesis that the cathode ray consisted of a stream of particles:

The TV set seen above is becoming harder and harder to find these days. The main reason is because they are older and based on outdated technology.  The new TV sets are flat screen technology that take up less space and give better picture quality, especially with the advent of high-definition broadcasting.  The technology used in the older TV sets used cathode ray tubes.  A beam of electrons was sprayed to a picture tube which was treated to react with the electrons to produce an image.  Similar ​​​​​​​CRT devices were used in computer monitors, now also replaced by flat screen monitors.

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Crookes' work opened the door to a number of important discoveries. Other scientists were able to demonstrate that the "cathode ray" was actually a stream of electrons. In 1897, Karl Ferdinand Braun developed the first oscilloscope, using a cathode ray tube to see an electrical pulse as it passed through the instrument. The invention of television would not have been possible without the cathode ray tube. Work with a modified system led to the discovery of x-rays in 1895 by the German physicist Wilhelm Roentgen. This simple device has led to major advances in science and technology.

When paired with the Intrepid ground glass the Fresnel Screen will brighten the projected image to make focusing easier, especially when using wide angle lenses ...

Refine your pronunciation of Fresnel lens with our free online dictionary. Our native speakers' recordings feature English and American spellings and ...

The process of transforming unpolarized light into polarized light is known as polarization. There are a variety of methods of polarizing light. The four ...

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