Numbered rods which can be used to perform Multiplication. This process is also called Rabdology.

**References**

Gardner, M. ``Napier's Bones.'' Ch. 7 in *Knotted Doughnuts and Other Mathematical Entertainments.*
New York: W. H. Freeman, 1986.

Pappas, T. ``Napier's Bones.'' *The Joy of Mathematics.* San Carlos, CA: Wide World Publ./Tetra, pp. 64-65, 1989.

© 1996-9

1999-05-25