It demonstrates the principle of potential energy storage and release via a coiled spring mechanism. Comprises a steel shaft which carries a clock spring with a free ¬wheel device and winding ratchet, also an Aluminium ‘V’ pulley 56 mm dia. One end of the shaft overhangs the base for use as a line shaft when winding up a weight. Dimensions 220 x 100 x 100 mm high. Size: 10 x 20 cm
