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Summary
| Description |
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 author |
Licensing
 |
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 | User created page with UploadWizard |
File usage
The following pages on the English Wikipedia use this file (pages on other projects are not listed):
Global file usage
The following other wikis use this file:
- Usage on hu.wikipedia.org
- Usage on zh.wikipedia.org
Metadata
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)
| 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
| Description |
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 author |
Licensing
|
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 | User created page with UploadWizard |
File usage
The following pages on the English Wikipedia use this file (pages on other projects are not listed):
Global file usage
The following other wikis use this file:
- Usage on hu.wikipedia.org
- Usage on zh.wikipedia.org