File:Joule's Apparatus (Harper's Scan).png

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English: Engraving of James Joule's apparatus for measuring the mechanical equivalent of heat, in which altitude potential energy from the weight on the right is converted into heat at the left, through stirring of water.
Français : Gravure représentant l’installation expérimentale utilisée par James Joule pour mesurer l’équivalence entre chaleur et travail. L’énergie potentilelle d’altitude du poids, à droite, est convertie en chaleur par agitation de l’eau à gauche.
Source Harper's New Monthly Magazine, No. 231, August, 1869.
Author Unknown


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This work is in the public domain in the United States because it was published (or registered with the U.S. Copyright Office) before January 1, 1924.

Public domain works must be out of copyright in both the United States and in the source country of the work in order to be hosted on the Commons. If the work is not a U.S. work, the file must have an additional copyright tag indicating the copyright status in the source country. PD-1923Public domain in the United States//

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current11:18, 18 October 2009Thumbnail for version as of 11:18, 18 October 20091,684 × 1,387 (382 KB)Ariadacapo (talk | contribs)Cleaned up background and improved contrast.
04:51, 5 January 2007Thumbnail for version as of 04:51, 5 January 20071,684 × 1,387 (1.2 MB)Chowbok (talk | contribs){{Information |Description=Engraving of Joule's apparatus for measuring the mechanical equivalent of heat. |Source=''Harper's New Monthly Magazine'', No. 231, August, 1869. |Date=1869 |Author=unknown |Permission=public domain }}{{PD-US}} [[Category:Harper
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