Napier's bones or rods, wood, in case
Napier's bones, cylindrical type, late 17th century. John Napier (1550-1617), discoverer of logarithms, created the popular calculating tool known as Napier's rods or bones. Napier's rods reduced multiplication to a sequence of simple additions; division and square roots could also be achieved.
- Object Number:
Box open: 75 mm x 230 mm x 115 mm, .28 kg
- napier's bones
- Dring and Fage
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