Definitions for napier's rods
Napier's bones, Napier's rods(noun)
a set of graduated rods formerly used to do multiplication and division by a method invented by John Napier
a set of rods, made of bone or other material, each divided into nine spaces, and containing the numbers of a column of the multiplication table; -- a contrivance of Baron Napier, the inventor of logarithms, for facilitating the operations of multiplication and division
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