File:Joule's Apparatus (Harper's Scan).png
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| Description |
Engraving of Joule's apparatus for measuring the mechanical equivalent of heat. |
| Date | 1869 |
| Source | Harper's New Monthly Magazine, No. 231, August, 1869. |
| Author | Unknown |
| Permission ( Reusing this file) |
public domain |
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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, 1923. See this page for further explanation. |
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