Numbered rods which can be used to perform multiplication.
Genaille Rods
See also
Napier's BonesExplore with Wolfram|Alpha
References
Gardner, M. "Napier's Bones." Ch. 7 in Knotted Doughnuts and Other Mathematical Entertainments. New York: W. H. Freeman, pp. 85-93, 1986.Havil, J. Gamma: Exploring Euler's Constant. Princeton, NJ: Princeton University Press, p. 18, 2003.Jones, B. R. "Genaille's Rods: An Ingenious Improvement on Napier's." Math. Gaz. 48, 17-22, 1964.Referenced on Wolfram|Alpha
Genaille RodsCite this as:
Weisstein, Eric W. "Genaille Rods." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/GenailleRods.html