A set of rod carved from bones
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Answer: 1) A tool called Napier's Bones (also called Napier's Rods) was invented by Scottish mathematician John Napier (1550–1617). These were multiplication tables inscribed on strips (also called rods) of bone (not Napier's, but animal bone), ivory, or wood. 2) The earliest recorded calculating device is the abacus.
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A tool called Napier's Bones (also called Napier's Rods) was invented by Scottish mathematician John Napier (1550–1617). These were multiplication tables inscribed on strips (also called rods) of bone (not Napier's, but animal bone), ivory, or wood. 2) The earliest recorded calculating device is the abacus.
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