Image:Joule's Apparatus (Harper's Scan).png
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Date/Time | Dimensions | User | Comment | |
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current | 04:51, 5 January 2007 | 1,684×1,387 (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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