Comprises:
- C1, The Automatic Computing Engine, typescript, pp. 62, Military College of Science, Shrivenham, 1947. This account is based on a series of informal talks given by Dr. A.M. Turing and Mr. Wilkinson of the Mathematics Division of the National Physical Laboratory;
- C2, Progress Report on the Automatic Computing Engine, typescript, pp. 127, Mathematics Division, April 1948;
- C3, Second Progress Report on the Automatic Computing Engine, typescript, pp. 18 + graphs, Mathematics Division, June 1949 (2 copies);
- C4, Report on the Pilot Model of the Automatic Computing Engine: Part II The Logical Design of the Pilot Model, typescript, pp. 16, Mathematics Division and Electronics Section, 1951.
- C5, Automatic Digital Computation, Proceedings of a Symposium held at the NPL on March 25, 26, 27 and 28, 1953, typescript, pp. 296, HMSO, 1954 (2 copies);
- C6, Report on the Washington Joint AIEEAIREACM Computer Conference, December 810, 1953, D.W. Davies, typescript, pp. 18, Mathematics Division, 1954;
- C7, The Work of Mathematics Division, typescript, pp. 4, 1954;
- C8, J.H. Wilkinson, Rounding Errors in Algebraic Processes, typescript, pp. 22, NPL, 1956;
- C9, Department of Scientific and Industrial Research, Wage Accounting by Machinery, typescript, pp. 54, 1956. Report of a Study Group of which the NPL was a part;
- C10, F.M. Blake et al, Some Features of the ACE Computer, typescript, pp. 28 + diagrams, 1957;
- C11, Specification for Data Processing Modules, typescript, pp. 8 + iv, 1964;
- C12, NPL, Notes for the Reader of Machine Translations, typescript with freehand notes, pp. 14, 1966.