This file is from Wikimedia Commons and may be used by other projects.
The description on its file description page there is shown below.
Summary
DescriptionWheatstone Rheostat 2.png
English: Charles Wheatstone's 1843 Rheostat with a moving whisker
Date
Source
Wheatstone, Charles: "An Account of several new Instruments and Processes for determining the Constants of a Voltaic Circuit", Philosophical Transactions of the Royal Society of London, Volume 133, 1843, pp. 308-309.
Author
Wheatstone, Charles
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 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.
Captions
Add a one-line explanation of what this file represents