The Amazing Dr. Nim Scale Model

The Amazing Dr. Nim is a toy invented by John Thomas Godfrey and manufactured by Education Science Research (E.S.R., Inc.) in the mid-1960s. It consists of a marble-powered plastic computer capable of playing the game of Nim. The machine selects its moves through the action of the marbles falling through the levers of the machine.

The "game board" is a based on the mechanical Digi-Comp II digital computer (also a Godfrey creation). It has memory switches that hold bits of data. The unit is pr