Pine board with inscribed paper glued to it. Across the center longitudinally is a metal rod along which two pointers can slide. Pointers can be rotated to point at either the top rows of numbers or the lower ones. Exact fractions are written as regular integers. Approximations are indicated by a number with an arc above.
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Shaker Museum Chart. https://shakermuseum.us/object/?id=1545. Accessed on November 15, 2024
