Thirlmere Waterworks
See Engineering 1891/10/30 for a description of the outlet from the lake, the isolating valves and strining wells. 42-inch valves were placed in series in the valve chamber upstream of the straining chamber. The first valve was hydraulically operated, while the second was manually operated. The simple hydraulic system comprised a hydraulic ram 30" diameter, 42.5" stroke. The water for operating the ram was drawn from a collecting basin on the hill.
See also The Thirlmere Works for the Water-Supply of Manchester' by George Henry Hill, M. Inst. C.E. [1]