Because he wanted a simple calculating device. (It's "bones" actually.)
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The probable cause of Napier's death was complications arising from gout, although this can now never be known with certainty.
John Napier. Have fun.
John Napier
1572 john Napier marries Agnes Chisholm
John Napier did not receive any at all. He is simply nowadays noted as the creator of logarithms.