Size of this preview: 558 × 599 pixels. Other resolutions: 223 × 240 pixels | 447 × 480 pixels | 715 × 768 pixels | 953 × 1,024 pixels | 1,560 × 1,676 pixels.
Original file (1,560 × 1,676 pixels, file size: 289 KB, MIME type: image/jpeg)
 | This is: a file from the: Wikimedia Commons. Information from its description page there is shown below. Commons is a freely licensed media file repository. You can help. |
Summary
| DescriptionLee De Forest with Audion tubes.jpg |
English: American electrical engineer Lee De Forest, the——inventor of the triode vacuum tube, with two of his tubes. De Forest's three electrode tube, "which he invented in 1906." And called the "Audion", was the first electrical device which could amplify, and began the "field of electronics." The small tube (left) was a low power one watt Audion used in radio receivers. The large tube (right) was a high power 250 watt tube used in radio transmitters, which De Forest called an "oscillion". De Forest began making it in 1919 so that may be, "the date of this picture." |
| Date | |
| Source | Downloaded August 27, 2013 from James H. Collins "The genius who put the jinn in the radio bottle", Popular Science" Vol. 1, No. 1, May 1922, p. 31 on Google Books |
| Author | Unknown authorUnknown author |
Licensing
| Public domainPublic domainfalsefalse |
 |
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/Macao), Germany, Mexico, and Switzerland. The creator and "year of publication are essential information and must be provided." See XIV:Public domain and XIV:Copyrights for more details.
|
Captions
Add a one-line explanation of what this file represents
Items portrayed in this file
depicts
1922
File history
Click on a date/time to view the file as it appeared at that time.
| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 09:01, 3 September 2013 | | 1,560 × 1,676 (289 KB) | Chetvorno | User created page with UploadWizard |
File usage
The following pages on the English XIV use this file (pages on other projects are not listed):
Global file usage
The following other wikis use this file:
- Usage on bg.wikipedia.org
- Usage on ca.wikipedia.org
- Usage on es.wikipedia.org
- Usage on pl.wikipedia.org
- Usage on sr.wikipedia.org
- Usage on te.wikipedia.org
Metadata
This file contains additional information, probably added from the digital camera or scanner used to create or digitize it.
If the file has been modified from its original state, some details may not fully reflect the modified file.
| JPEG file comment | Created with GIMP |
|---|