The apparatus consists of a flywheel on a horizontal shaft carried in a pair of similar bearings, the flywheel being used to even out small variations in friction. The shaft is of mild steel, and interchangeable bearings in a range of materials are provided.

For comparison a ball or roller bearing is available to demonstrate the advantages of rolling rather than sliding contact.

Torque is applied by a loaded cord wrapped round the flywheel shaft. A set of calibrated weights and Load hanger is supplied for loading the flywheel.