Napier's bones (1 jan 1617 ano – 20 h 53 m, 30 jul 2019 ano)

Descrição:

Napier's bones are a manually-operated calculating device created by John Napier of Merchiston, Scotland for calculation of products and quotients of numbers. With a method based on lattice calculating. The rods looked like bones which is why it was called Napier’s bones

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