Demonstration Electric Motor. Completely open construction and all parts clearly visible.Operates on 4.5 – 9 Volts DC.A model of the simplest form of DC electric motor, having three rotors (2 pole, 3 pole and 4 pole), wound with enamelled copper wire and a permanent magnetic field provided by a removable bar magnet.The construction of the model is completely open and all parts clearly visible.A disc-type commutator is incorporated and external connection to the phosphor-bronze bushes is by means of a pair of 4 mm sockets.Operates on 4.5 – 9 Volts DC.Units: Each