Lord Kelvin's Ampere Balance
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“When a current is passed through the instrument it causes one end of the movable system to tilt downwards, and the other end upwards; the sliding weight is then moved along the tray by means of a silk cord until equilibrium is again established.” —Encyclopedia Britannica, 1910
Source
The Encyclopedia Britannica: Volume 1 (New York, NY: The Encyclopedia Britannica Company, 1910)
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