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Amgueddfa Cymru – Museum Wales
Typed in black ink on light grey/white paper. Some details are handwritten in pencil. Signed EID (E.Ivor David) in blue ink. A letter from E.Ivor David to S.B. Haslam of the S.Wales Institute of Engineers regarding a paper by B.L.Metcalfe. Dated 10 November, 1943. 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'.
