Meaning of NAPIER'S BONES

WordNet Dictionary
	Definition:		[n]  a set of graduated rods formerly used to do multiplication and division by a method invented by John Napier
	Websites:
	Synonyms:		Napier's rods
	See Also:		calculating machine, calculator
Webster's 1913 Dictionary
	Definition:		\Na"pi*er's bones`\, Napier's rods \Na"pi*er's