Here is a wonderful "Ives No. 252" toy bi-polar dynamo electric motor. This item is a great hard working toy motor. It has a cast iron base, bi-polar field magnet wound for 2 to 6 volts and a spring loaded commutator brush assembly. The cast iron base is 3.5 inches by 3.5 inches and 1.0 inches high. The motor and base are 5.0 inches high.