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C'est un abaque pour faire des calculs : multiplication, divisions, même racines carrées.Cette calculatrice analogique a été inventée par J. Napier en 1617.Ces séries de tiges, placées de différentes manières, nous ont permis de résoudre des problèmes de multiplication, de longues divisions et de racines carrées et cubiques. Sa méthode a réduit ces problèmes de multiplication à des sommes et les quotients ont été réduits à des soustractions...Il a été d'une grande utilité pour les calculs quotidiens et les machines de calcul anticipées plus tard.
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HEMISFERIUM
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HEMISFERIUM
Napier Bones
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