Demonstration Dynamo For the demonstration of A.C. and D.C. current generation. Consists of a hand-drive pulley coupled to the dynamo with a rubber belt. A bulb is mounted on the base which glows when the pulley is rotated. A pair of 4mm socket terminals is provided for connections to external meters. Includes a selector switch for A.C. or D.C. output. Open construction and mounted on a wooden base. Qty :