File:Crookes magnetic deflection tube.png
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[edit]DescriptionCrookes magnetic deflection tube.png |
English: Drawing of a Crookes tube which demonstrated magnetic deflection of cathode rays, built by British physicist William Crookes around 1879. The tube was evacuated to a pressure of about 10-6 to 10-7 atmosphere. When a high DC voltage of several thousand volts or more was applied between the electrodes (N,P) in the tube, electrons (cathode rays) radiated from the negative terminal or cathode (N) on the left. The horizontal slit (e) in the metal divider (c,d) inside the tube allowed a thin beam to pass through. The horseshoe shaped magnet below the tube created a horizontal magnetic field in the center of the tube. When the electrons passed through it, the Lorentz force of the magnetic field on the moving electrons bent the beam (g) downward. When the magnet was removed, the electrons continued in a straight path (f) down the tube. The electrons themselves were invisible, but the divider was painted with a chemical, such as zinc sulfide, which fluoresced when struck by the electrons, which made the path of the beam visible. This experiment, which proved that cathode rays obeyed Faraday's law like electric currents in wires, was important in establishing that cathode rays, that is electrons, were the particles responsible for electricity. |
Date | |
Source | Downloaded October 2, 2008 from William Crookes (November 1879) On Radiant Matter, Popular Science Monthly, London, p.158 on Jeff Behary's, Turn of the Century Electrotherapy Museum website |
Author | William Crookes |
Permission (Reusing this file) |
Public Domain - Crookes died 1919 |
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[edit]Public domainPublic domainfalsefalse |
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This work is in the public domain in its country of origin and other countries and areas where the copyright term is the author's life plus 70 years or fewer.
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This file has been identified as being free of known restrictions under copyright law, including all related and neighboring rights. |
https://creativecommons.org/publicdomain/mark/1.0/PDMCreative Commons Public Domain Mark 1.0falsefalse
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current | 07:15, 6 October 2008 | ![]() | 1,044 × 343 (75 KB) | Chetvorno (talk | contribs) | {{Information |Description={{en|A Wikipedia:Crookes tube which demonstrates magnetic deflection of cathode rays, built by British physicist Wikipedia:William Crookes around 1879.}} |Source=Downloaded October 2, 2008 from [http://www.electrothera |
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