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Napier's bones were calculator sticks invented in 1617 to multiply big numbers by a single digit : r/toolgifs
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This image belongs to Napier's Rods is also known by Napier's bones, is a calculating device made by John Napier of Merchiston for calculation, vintag Stock Vector Image & Art - Alamy
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How to make Napier's bone calculator | Maths and computer activity -Napier's bone calculator | - YouTube
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Napier's Bones - Maths Toy - Early Calculating Device | Computer history, Old calculator, Multiplication
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