A model of the simplest form of DC motor; having 3 armatures - 2 poles, 3 poles, & 4 poles, wound with enameled copper wire, & a permanent magnetic field provided by a removable bar magnet. The construction is completely open & all components are readily observable. A disc-type commutator is incorporated & external connection to the phosphor - bronze bushes is by means of a pair of 4 mm sockets. The motor shall operate on 4.5 to 9 volts DC
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