by John Napier in 1617
Because he wanted a simple calculating device. (It's "bones" actually.)
John Napier invented the Napier's Bone
John Napier invented the Napier`s bone in 1617
Napier's Bones. It was a type of abacus.
Napier's Bones is a quick and easy way of doing multiplications, invented by John Napier in the 17th Century.
Napier's bones, used for calculating products and quotients of numbers was also called Rabdology. Napier first published his method in 1617.
John Napier, renowned for his work involving logarithms was born in 1550 and died in 1617.