File:Crystal radio in finger ring.jpg
Size of this preview: 598 × 600 pixels. Other resolutions: 239 × 240 pixels | 479 × 480 pixels | 768 × 770 pixels.
Original file (768 × 770 pixels, file size: 85 KB, MIME type: image/jpeg)
File information
Structured data
Captions
Summary edit
DescriptionCrystal radio in finger ring.jpg |
English: A tiny crystal radio receiver built into a finger ring by a young radio enthusiast around 1922, from a radio magazine. Radio broadcasting started around 1920, and in the early 20s radio listening exploded into a hugely popular new high-tech pastime. The most popular type of receiver was the simple crystal radio, a passive receiver that ran off the power of the station's radio waves; these were homemade by the millions. It consisted of a length of wire aerial, a tuning coil, a small crystal of a mineral such as galena which rectified the radio signal to extract the audio modulation, and earphones. During the "radio craze" of the early 20s hobbyists built tiny crystal radios like this as novelties into pipes, matchboxes, watches, and umbrellas. The crystal detector can be seen on the ring in closeup photos. This receiver may not have had a tuning coil and may just consist of a detector and earphones; such simple crystal radios just pick up the most powerful station in the vicinity. Caption: "A FINGER-RING RECEIVER. This is claimed to be the smallest set made. Do our readers know of one smaller?" |
Date | |
Source | Retrieved January 27, 2014 from Popular Radio, Popular Radio Inc., New York, Vol. 2, No. 3, November 1922, p. 221 on Google Books |
Author | Photo credit to "Pacific & Atlantic" |
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 | 22:48, 27 January 2014 | 768 × 770 (85 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 es.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 |
---|