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Napier's bones are an abacus invented by John Napier for calculation of products and quotients of numbers. Also called Rabdologia. Napier published his invention of the rods in a work printed in Edinburgh at the end of 1617 also entitled Rabdologia. Using the multiplication tables embedded in the rods, multiplication can be reduced to addition operations and division to subtractions. More advanced use of the rods can even be used to extract square roots....
 
 
Napier's bones are an abacus invented by John Napier for calculation of products and quotients of numbers. Also called Rabdologia. Napier published his invention of the rods in a work printed in Edinburgh at the end of 1617 also entitled Rabdologia. Using the multiplication tables embedded in the rods, multiplication can be reduced to addition operations and division to subtractions. More advanced use of the rods can even be used to extract square roots....

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    Napier, Inventor of Logarithms
  Napier, Inventor of Logarithms
John Napier was a Scottish mathematician, physicist, astronomer & astrologer, and also the 8th Laird of Merchistoun. He was the son of Sir Archibald Napier of Merchiston. John Napier is most renowned as the discoverer of the logarithm. Napier is the...
 
       
         
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