Wheel 1: overshot, cast in Tavistock in the late 19th century. Pumped drinking water to workers cottages. Can be operated. Wheel 2: 32-ft diameter, cast in Newton Abbot in 1908 and used in a Dartmoor china clay works. Can be operated. Wheel 3: in the Victorian farm buildings, once powered a threshing machine. Now working, supplied by a hydraulic ram pump. Wheel 4: 18-ft diameter and 100-ft...