Calculating machine, 18th century

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SQ1631

Diagram of a calculating machine from the 18th century designed by John Rowning. Image from "Directions for Making a Machine for Finding the Roots of Equations Universally, with the Manner of Using It: By the Rev. Mr. Rowning, to John Bevis", published by John Rowning, on January 1, 1770.

Royal Astronomical Society / Science Source

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