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Napier's bones

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noun Na·pi·er's bones \ˈnā-pē-ərz-\

Definition of Napier's bones

  1. :  a set of graduated rods (as of wood or bone) invented by John Napier and used for multiplication and division based on the principles of logarithms



Circa 1658

First Known Use of napier's bones

circa 1658


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