Images from the Wikimedia Commons Napier’s Bones category.“Napier’s bones are

Images from the Wikimedia Commons Napier’s Bones category.“Napier’s bones are
Images from the Wikimedia Commons Napier’s Bones category.“Napier’s bones are
Images from the Wikimedia Commons Napier’s Bones category.“Napier’s bones are
Images from the Wikimedia Commons Napier’s Bones category.“Napier’s bones are
Images from the Wikimedia Commons Napier’s Bones category.“Napier’s bones are
Images from the Wikimedia Commons Napier’s Bones category.“Napier’s bones are
Images from the Wikimedia Commons Napier’s Bones category.“Napier’s bones are
Images from the Wikimedia Commons Napier’s Bones category.“Napier’s bones are
Images from the Wikimedia Commons Napier’s Bones category.“Napier’s bones are
Images from the Wikimedia Commons Napier’s Bones category.“Napier’s bones are

Images from the Wikimedia Commons Napier’s Bones category.“Napier’s bones are a manually-operated calculating device created by John Napier of Merchiston, Scotland for calculation of products and quotients of numbers. The method was based on Arab mathematics and the lattice multiplication used by Matrakci Nasuh in the Umdet-ul Hisab and Fibonacci’s work in his Liber Abaci. The technique was also called Rabdology. Napier published his version in 1617 in Rabdology, printed in Edinburgh, Scotland, dedicated to his patron Alexander Seton.” (Wikipedia). -- source link


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