File:Western Electric triode.jpg
Size of this preview: 332 × 599 pixels. Other resolutions: 133 × 240 pixels | 462 × 834 pixels.
Original file (462 × 834 pixels, file size: 64 KB, MIME type: image/jpeg)
Captions
Captions
Add a one-line explanation of what this file represents
Summary edit
| Description |
English: One of the first triode vacuum tubes, manufactured around World War 2 by Western Electric, the manufacturing arm of American Telephone and Telegraph (AT&T) Lee De Forest, the inventor of the triode, sold the rights to the triode to Western Electric in 1913. It consists of an evacuated bulb with three electrodes: a heated filament, grid, and plate The filament is in the center of the tube. The two connected grids cosisting of square screens of wire are visible on either side of the filament. The two square plates are outside the grids. When heated by a separate current the filament released electrons, which flowed from the filament in the center through the grids to the positively charged plates. A small variable voltage on the grid could control the much larger current from filament to plate, allowing the tube to amplify weak signals in radio receivers. |
| Date | before 1922 |
| Source | Downloaded July 28, 2013 from Henry Smith Williams (1922) Practical Radio, Funk and Wagnalls, New York, p. 132, fig. 2 on Google Books |
| Author | Unknown author |
Licensing edit
 |
This media file is in the public domain in the United States. This applies to U.S. works where the copyright has expired, often because its first publication occurred prior to January 1, 1929, and if not then due to lack of notice or renewal. See this page for further explanation.
|
 |
 |
This image might not be in the public domain outside of the United States; this especially applies in the countries and areas that do not apply the rule of the shorter term for US works, such as Canada, Mainland China (not Hong Kong or Macao), Germany, Mexico, and Switzerland. The creator and year of publication are essential information and must be provided. See Wikipedia:Public domain and Wikipedia:Copyrights for more details.
|
| Annotations | This image is annotated: View the annotations at Commons |
File history
Click on a date/time to view the file as it appeared at that time.
| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 07:29, 29 July 2013 | | 462 × 834 (64 KB) | Chetvorno (talk | contribs) | User created page with UploadWizard |
You cannot overwrite this file.
File usage on Commons
The following page uses this file:
- File:Audion with two plates.jpg (file redirect)
