An important early 19th Century magnetic coupling apparatus, mounted on a mahogany base applied with a King George III Collection label and stamped K.C.L., - 13½in (34.3cm) wide; and an early electric generator demonstration apparatus on mahogany base - 13¼in (33.6cm) wide; and a photograph with description of the original dynamo electric machine constructed by S. Alfred Varley August 1866, in an Oxford frame (2)