A model of the simplest form of d.c. electric motor; having a 2-pole armature wound with enamelled copper wire; and a permanent magnetic field provided by a removable magnet. The construction of the model is completely open and all components are readily observable. A disc-type commutator is incorporated and external connection to the phosphor-bronze bushes is by means of a pair of 4mm sockets. The motor will operate on 3 to 6V d.c.