Slider of Kelvin Ampere Balance

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“The upper edge of the shelf on which the weights slide is graduated into equal divisions, and the weight is provided with a sharp tongue of metal in order that its posistion on the shelf may be accurately determined.” —Encyclopedia Britannica, 1910


The Encyclopedia Britannica: Volume 1 (New York, NY: The Encyclopedia Britannica Company, 1910)


TIFF (full resolution)

2512×2400, 1.2 MiB

Large GIF

1024×978, 154.3 KiB

Medium GIF

640×611, 78.8 KiB

Small GIF

320×305, 28.4 KiB