Set of Napier's rods, 1770-1790.

Image number: 10411346

Set of Napier's rods, 1770-1790.

Napier's rods, set in wooden box with trade label 'J Imison Clock and Watch Maker, Optician &tc, No 58 Hay-market, London'. John Napier (1550-1617), discoverer of logarithms, created the popular calculating tool known as Napier's rods or bones. Napier's rods reduced muliplication to a sequence of simple additions; division and square roots could also be achieved.

Image number:
10411346
Credit:
Science Museum/Science & Society Picture Library
Date taken:
29 October 2003 12:17
Image rights:
Science Museum