Westminster motor kits

Prefabricated kits for making educational motors in school. They are
available to buy from educational science suppliers and allow students to
build their own motors from a couple of magnets and a meter or so of plastic
coated wire.

The instructions that come with the kits are aimed at an adult readership so
child friendly notes should be given to schoolchildren.

The most common causes for them not to work are:

   * One of the magnets being turned the wrong way round.
   * Insulation issues the spindles are made of metal and have to be
     insulated with sticky tape.
   * Poor Contact with the 'brushes'

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