Electrical machine, c 1762.
© Science Museum / Science & Society Picture Library
This electrical machine was made by George Adams, instrument maker to the king, for King George III. The stand was added later. The glas globe was turned using the handle so that it rubbed against the cushion and produced a charge. The charge would have been collected from the glas or the backplate of the cushion and used to make sparks or for other electrical experiments.