Napier's bones


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Synonyms for Napier's bones

a set of graduated rods formerly used to do multiplication and division by a method invented by John Napier

References in periodicals archive ?
Kimberly Baxter, exhibition designer Napier's Bones They're very clever, and anything which makes maths easier is good in my book.
With a few simple tools and a surprisingly small number of parts, mathematics instructors from around the US present ways to make historical instruments and learning devices, producing labyrinths, Napier's Bones, the Towers of Hanoi, Pythagorean and string models, French curves, a panimeter, a cycloid pendulum clock and a brachistocrone.
Napier invented a primitive form of a calculating machine which is now called Napier's Bones.