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Amgueddfa Cymru – Museum Wales
Typed in black ink on off-white paper. Some details handwritten in green pencil. A discussion of the paper by B.L.Metcalfe on the economics of power consumption at collieries given at the South Wales Institute of Engineers on 10 May 1945. Loose within a beige/light brown file containing copies of the 'Metcalf papers' and documents relating to the 'Conversion of Turbo Compressor to Electrical Drive'.
