File:1911 Britannica - Lord Kelvin's Ampere Balance.png
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![File:1911 Britannica - Lord Kelvin's Ampere Balance.png](https://upload.wikimedia.org/wikipedia/commons/thumb/6/64/1911_Britannica_-_Lord_Kelvin%27s_Ampere_Balance.png/800px-1911_Britannica_-_Lord_Kelvin%27s_Ampere_Balance.png?20120108195540)
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