Portions of Ronalds' electrostatic telegraph, 1816
Telecommunications
1816
Portions of Ronalds' electrostatic telegraph, Sir Francis Ronalds, Hammersmith, 1816. With replica dial, unknown maker, 1816-1894. In glazed mahogany case, made by Science Museum Workshops, London, England, 1994. Also, diagram of Sir Francis Ronalds' 1816 electrostatic telegraph, in glazed mahogany frame, made by Science Museum, London, England, 1920-1929