NAPIER'S BONE:
Napier's Bone was invented by John Napier who was a Scottish mathematician.
It is a device consisting of 10 rods engraved with numbered parts. Each rod was further divided into 9 diagonal number parts.
The purpose of Napier's Bone is to extract square roots, divisions, multiplications.
source: pinterest.comThe features of Napier's Bone are as follows:
a) It helps in rapid calculations,
b) It is a small device of calculation.
c) Usually it is made of wood.
source:wikipedia.org
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