File:Homemade Audion receiver 1914.jpg

From Wikimedia Commons, the free media repository
Jump to navigation Jump to search

Original file ‎(1,348 × 1,142 pixels, file size: 198 KB, MIME type: image/jpeg)

Captions

Captions

Homemade Audion radio receiver

Summary[edit]

Description
English: A homemade Audion radio receiver constructed by an amateur radio hobbyist 1914. The Audion (triode), the first amplifying vacuum tube, was invented by Lee De Forest in 1907 but was not widely used until its amplifying ability was recognized around 1913, so this is one of the earliest vacuum tube radios. From left, the apparatus consists of an automobile storage battery to provide the filament current, and a tuning coil. Audions were always mounted hanging upside down, with the delicate tungsten loop filament hanging down, to prevent it from sagging and touching the grid.
Date
Source Retrieved October 22, 2013 from E. E. Butcher, "How to conduct a radio club, Article 3" in The Wireless Age magazine, Vol. 1, No. 7, April 1914, p. 527 at http://www.americanradiohistory.com
Author Elmer Eustice Bucher

Licensing[edit]

Public domain
Public domain
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.
United States
United States
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/TimeThumbnailDimensionsUserComment
current21:18, 29 December 2015Thumbnail for version as of 21:18, 29 December 20151,348 × 1,142 (198 KB)Chetvorno (talk | contribs)User created page with UploadWizard

You cannot overwrite this file.

There are no pages that 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.

Retrieved from "https://commons.wikimedia.org/w/index.php?title=File:Homemade_Audion_receiver_1914.jpg&oldid=642890046"