Napier\'s bones

Napier's bones

noun Mathematics.
a form of multiplication table originally marked on sticks of bone or ivory that could be rearranged to carry out the operations of multiplication or division.
Also called Napier's rods.


Origin:
1650–60; after their developer, J. Napier
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Napier's bones is always a great word to know.
So is proportion. Does it mean:
a proportion containing terms of which an increase in one results in a decrease in another
a relation of four quantities such that the first divided by the second is equal to the third divided by the fourth; the equality of ratios
Collins
World English Dictionary
Napier's bones
 
pl n
a set of graduated rods formerly used for multiplication and division
 
[C17: based on a method invented by John Napier]

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