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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.
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Umthombo Harper's New Monthly Magazine, Vol. 39, No. 231, p. 327, August 1869.
Umlobi Jacob Abbott

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Note: This tag should not be used for sound recordings.PD-1923Public domain in the United States//commons.wikimedia.org/wiki/File:Joule%27s_Apparatus_(Harper%27s_Scan).png

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Njengamanje11:18, 18 uMfumfu 2009Isithonjana senguquko eyenziwa nge-11:18, 18 uMfumfu 20091,684 × 1,387 (382 KB)AriadacapoCleaned up background and improved contrast.
04:51, 5 uMasingana 2007Isithonjana senguquko eyenziwa nge-04:51, 5 uMasingana 20071,684 × 1,387 (1.2 MB)Chowbok{{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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