Napier's bones definition

  • noun-plural:
    • a collection of graduated rods regularly perform multiplication quickly.
  • noun:
    • a couple of numbered rods employed for multiplication and division (look at Wikipedia article for a fuller explanation).
    • a collection of graduated rods formerly used to do multiplication and unit by a way conceived by John Napier
  • others:
    • a collection of rods, manufactured from bone or other material, each divided into nine rooms, and containing the amounts of a column regarding the multiplication table; -- a contrivance of Baron Napier, the inventor of logarithms, for assisting the businesses of multiplication and unit.

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