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
. They consist of a set of rods which can be laid together to find the solutions to multiplications and divisions.