Details

Three A3 photocopied sheets folded in half from the Public Records Office ref. AIR 2/3055 and XC/24702. The first sheet is a letter from Watson Watt to D.D.Ops. (H) and D. of S. dated 29.7.39. The second sheet is a letter dated 8th Nov. 1939 from The Under-Secretary of State, Air Ministry (Sigs.1.a.), Whitehall. The third sheet is a letter to The Under-Secretary of State, Air Ministry, R.D.C.4., Harrogate from Colonel D. Whitehead, B.M.H.Q., Leighton Buzzard dated 20th Dec. 1939 regarding ‘Electrical Calculators for CHL’.