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Typed in black ink on off-white paper. Some details handwritten in pencil. A request from Ewbank and Partners Limited Power Stations, for information regarding the theoretical thermal efficiency for Bargoed & Middle Duffryn Stations, with a list of questions relating to tests carried out on the boilers and turbines. Loose within pink/peach card file with other documents relating to Middle Duffryn and Bargoed High Pressure Station.
