Napier's rods, 1671-1700.
3 1 c m
actual image size: 32cm x 23cm

Napier's rods, 1671-1700.

© Science Museum / Science & Society Picture Library


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. This instrument consists of a wooden box containing ten rotating cylinders each of which bears the numbers '0 times' to '9 times'.

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