Napier's Bone
John Napier a Scottish mathematician invented Napier's Bone in 1617 AD. The bone is an abacus like device and consists of 11 sets of rods. The ten rods were carved with multiplication of numbers from 0 to 9 these numbers were separated with diagonal lines. It is based on the principle of logarithmic tables. This device was made to perform multiplication and division of numbers by rotating the rods having the numbers in those times .
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