File:Irving Langmuir and Guglielmo Marconi in lab.jpg
From Wikimedia Commons, the free media repository
Jump to navigation
Jump to search
Size of this preview: 511 × 599 pixels. Other resolutions: 205 × 240 pixels | 409 × 480 pixels | 995 × 1,167 pixels.
Original file (995 × 1,167 pixels, file size: 178 KB, MIME type: image/jpeg)
File information
Structured data
Captions
Captions
Add a one-line explanation of what this file represents
Summary
[edit]DescriptionIrving Langmuir and Guglielmo Marconi in lab.jpg |
English: Physicist Irving Langmuir (center) in his lab at General Electric in 1922, showing radio pioneer Guglielmo Marconi (right) a new 20 kW triode vacuum tube GE has developed for radio transmitters. Langmuir, a pioneer in vacuum technology and the inventor of the diffusion pump, is responsible for developing the modern "hard vacuum" radio tubes. The man on the left is Willis R. Whitney, director of GE's research lab. |
Date | |
Source | Downloaded 28 August 2013 from "New 20 Kw Vacuum Tubes Open Great Radio Transmission Possibilities", Electrical Record (Electrical Record Publishing Co., New York), Vol. 32, No. 2, August 1922, p. 73 on Google Books |
Author | Unknown authorUnknown author |
Licensing
[edit]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 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.
|
File history
Click on a date/time to view the file as it appeared at that time.
Date/Time | Thumbnail | Dimensions | User | Comment | |
---|---|---|---|---|---|
current | 03:21, 6 October 2013 | 995 × 1,167 (178 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:
- Usage on en.wikipedia.org
- Usage on hu.wikipedia.org
- Usage on zh.wikipedia.org
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 |
---|