File:Early triode vacuum tubes.jpg
![File:Early triode vacuum tubes.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/2/25/Early_triode_vacuum_tubes.jpg/369px-Early_triode_vacuum_tubes.jpg?20130727133244)
Original file (1,080 × 1,756 pixels, file size: 409 KB, MIME type: image/jpeg)
Captions
Captions
Summary
[edit]DescriptionEarly triode vacuum tubes.jpg |
English: The first triode vacuum tubes from around 1918, all derived from the Audion tube, invented by Lee De Forest in 1906. The recognition of the Audion's ability to amplify signals, around 1912, caused its rapid development by several organizations.
|
Date |
before 1918 date QS:P,+1918-00-00T00:00:00Z/7,P1326,+1918-00-00T00:00:00Z/9 |
Source | Downloaded July 22,2013 from The Principles Underlying Radio Communication, National Bureau of Standards radio pamphlet no. 40, US Signal Corps. December 10, 1918, US Government Printing Office, p. 321, fig. 250 on Google Books |
Author | Unknown authorUnknown author |
Licensing
[edit]Public domainPublic domainfalsefalse |
![]() |
This work is in the public domain in the United States because it is a work prepared by an officer or employee of the United States Government as part of that person’s official duties under the terms of Title 17, Chapter 1, Section 105 of the US Code.
Note: This only applies to original works of the Federal Government and not to the work of any individual U.S. state, territory, commonwealth, county, municipality, or any other subdivision. This template also does not apply to postage stamp designs published by the United States Postal Service since 1978. (See § 313.6(C)(1) of Compendium of U.S. Copyright Office Practices). It also does not apply to certain US coins; see The US Mint Terms of Use.
|
![]() |
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
Annotations InfoField | This image is annotated: View the annotations at Commons |
High power Audions, which De Forest called "Oscillions", for transmitters
Low power pliotrons for receiving, designed by Irving Langmuir at General Electric
High power triodes for transmitters made by AT&T (Western Electric)
French triodes
File history
Click on a date/time to view the file as it appeared at that time.
Date/Time | Thumbnail | Dimensions | User | Comment | |
---|---|---|---|---|---|
current | 13:32, 27 July 2013 | ![]() | 1,080 × 1,756 (409 KB) | Chetvorno (talk | contribs) | User created page with UploadWizard |
You cannot overwrite this file.
File usage on Commons
There are no pages that use this file.
File usage on other wikis
The following other wikis use this file:
Metadata
This file contains additional information such as Exif metadata which may have been added by the digital camera, scanner, or software program used to create or digitize it. If the file has been modified from its original state, some details such as the timestamp may not fully reflect those of the original file. The timestamp is only as accurate as the clock in the camera, and it may be completely wrong.
JPEG file comment | Created with GIMP |
---|