12-inch diameter series 'O' Gilkes' Francis Turbine (4.2 bhp on nett working fall of 5 ft. using 570 cubic ft of water per minute; 270 rpm), with suspension bearing, steel countershaft, and hand operating gear for working guide-blades. Developed by James Bicheno Francis, it became widely accepted as the best for heads of water up to 50 m. Manufactured by Gilbert Gilkes & Co., Kendal, Cumbria, England, 1924. Francis Turbine, 1924 1924
