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The Napier's bones, also known as Napier's rods, were a calculating device used for multiplication and division in the 17th century. They consist of a set of numbered rods, each representing a digit from 0 to 9. By aligning the rods and performing a series of additions and subtractions, complex calculations could be carried out quickly and accurately. This mechanical tool was a precursor to modern-day multiplication and division methods, such as the multiplication table and long division algorithm.

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The rods in John Napier's invention, known as Napier's Bones, basically contained the columns of a multiplication table. They could be used to multiply, divide, and even extract square roots. John Napier also was a pioneer in creating tables of logarithms, but the rods had nothing to do with that.

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12y ago
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Q: What is the function of the napier rod?
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