File:Braun cathode ray tube.jpg
Summary
Drawing of the first <a href="https://en.wikipedia.org/wiki/cathode_ray_tube" class="extiw" title="en:cathode ray tube">cathode ray tube</a> invented by German scientist <a href="https://en.wikipedia.org/wiki/Ferdinand_Braun" class="extiw" title="en:Ferdinand Braun">Ferdinand Braun</a> in 1897. It was a <a href="https://en.wikipedia.org/wiki/cold_cathode" class="extiw" title="en:cold cathode">cold cathode</a> tube, developed from the <a href="https://en.wikipedia.org/wiki/Crookes_tube" class="extiw" title="en:Crookes tube">Crookes tube</a> and so did not have a heated <a href="https://en.wikipedia.org/wiki/electrical_filament" class="extiw" title="en:electrical filament">filament</a> to produce electrons. Instead it produced electrons by ionization of residual gas in the tube with a high voltage. The tube contains a platinum <a href="https://en.wikipedia.org/wiki/cathode" class="extiw" title="en:cathode">cathode</a> electrode (right end), an <a href="https://en.wikipedia.org/wiki/anode" class="extiw" title="en:anode">anode</a> electrode consisting of an open tube in the neck to focus the electrons into a narrow beam (center right), a pair of flat <a href="https://en.wikipedia.org/wiki/deflection_plate" class="extiw" title="en:deflection plate">deflection plates</a> (center left), and a paper screen (left) painted on the inner side with a fluorescent chemical like zinc sulfide or calcium tungstate. When a high voltage is applied between the cathode and anode, it creates positive ions which are attracted to the negative cathode. When they strike the cathode they knock out electrons (cathode rays) which are accelerated down the tube to the left, through the anode tube, between the deflection plates, and strike the fluorescent screen at the left end, producing a glowing spot. If a second voltage is applied between the deflection plates the electron beam will be repelled by the positive plate and attracted toward the negative plate, so the spot on the end screen will move toward the positive plate.
Licensing
Lua error in package.lua at line 80: module 'strict' not found.
File history
Click on a date/time to view the file as it appeared at that time.
| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 00:31, 6 January 2017 | | 1,084 × 216 (38 KB) | 127.0.0.1 (talk) | Drawing of the first <a href="https://en.wikipedia.org/wiki/cathode_ray_tube" class="extiw" title="en:cathode ray tube">cathode ray tube</a> invented by German scientist <a href="https://en.wikipedia.org/wiki/Ferdinand_Braun" class="extiw" title="en:Ferdinand Braun">Ferdinand Braun</a> in 1897. It was a <a href="https://en.wikipedia.org/wiki/cold_cathode" class="extiw" title="en:cold cathode">cold cathode</a> tube, developed from the <a href="https://en.wikipedia.org/wiki/Crookes_tube" class="extiw" title="en:Crookes tube">Crookes tube</a> and so did not have a heated <a href="https://en.wikipedia.org/wiki/electrical_filament" class="extiw" title="en:electrical filament">filament</a> to produce electrons. Instead it produced electrons by ionization of residual gas in the tube with a high voltage. The tube contains a platinum <a href="https://en.wikipedia.org/wiki/cathode" class="extiw" title="en:cathode">cathode</a> electrode <i>(right end)</i>, an <a href="https://en.wikipedia.org/wiki/anode" class="extiw" title="en:anode">anode</a> electrode consisting of an open tube in the neck to focus the electrons into a narrow beam <i>(center right)</i>, a pair of flat <a href="https://en.wikipedia.org/wiki/deflection_plate" class="extiw" title="en:deflection plate">deflection plates</a> <i>(center left)</i>, and a paper screen <i>(left)</i> painted on the inner side with a fluorescent chemical like zinc sulfide or calcium tungstate. When a high voltage is applied between the cathode and anode, it creates positive ions which are attracted to the negative cathode. When they strike the cathode they knock out electrons (cathode rays) which are accelerated down the tube to the left, through the anode tube, between the deflection plates, and strike the fluorescent screen at the left end, producing a glowing spot. If a second voltage is applied between the deflection plates the electron beam will be repelled by the positive plate and attracted toward the negative plate, so the spot on the end screen will move toward the positive plate. |
- You cannot overwrite this file.
File usage
The following page links to this file:
