Comprises:
- C1, A.M. Turing, Mark I Programming Manual (c 1950), typescript, pp.110;
- C2/3, Two files of rough notes, working drafts, concerning inter alia, programming the Manchester Mark I and morphogenesis theory. The material includes typescripts and offprints from C.M. Wardlaw, the Manchester botanist;
- C4, A.M. Turing, Proposed Electronic Calculator. Typescript of Turing's proposal for the ACE, from the files of the Scientific Computing Service Ltd. Probably L.J. Comrie's copy.