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Biography 
A Description of the Admirable
Table of Logarithms  Napier's
Rods 
John Napier and the Devil  References 




John Napier's rods (1617) (Napier Rechenstäbchen), also known as Napier's bones, are one of
his most important
contributions to the world of mathematics and alongside
William Oughtred's invention of the Slide Rule (1615), represents one
of the most revolutionary
developments in calculation devices since the abacus.
The rods were basically multiplication tables inscribed on sticks of wood
or bone. In addition to multiplication, the rods were also used in
taking square roots and cube roots.


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