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| Picture No | 10085063 |
| Date | circa 1840 |
| Description | Joule - Electricity Test |
| Details |
James Prescott Joule, English physicist, measures the rate at which heat is produced by an electric current. The joule, a unit of work or energy, is named after him.
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| Source | Unattributed engraving |
| Credit | Mary Evans Picture Library |
| Restrictions |
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