napier's rods

Found in Anh - Anh (Wordnet)

Definition Noun : * Napier's rods : A historical calculating tool consisting of a set of numbered rods or bones, used for performing multiplication and division. The device was invented by the Scottish mathematician John Napier in the early 17th century. Usage The term is used historically to refer to the specific physical calculating device invented by John Napier. It is a proper noun phrase....