Napier's Bones, c 1690.

Image number: 10306291

Napier's Bones, c 1690.

John Napier (1550-1617), discoverer of logarithms, also created this popular calculating tool known as Napier's cylindrical 'rods' or 'bones'. Napier's rods reduced multiplication to a sequence of simple additions and could also be used for division and to calculate square roots.

Image number:
Science Museum/Science & Society Picture Library
Date taken:
29 October 2003 12:06
Image rights:
Science Museum

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