Exercise book, 'Constants and Useful Numbers in Binary notation' (and other notes).

Three bundles of notes on mathematical functions (in original folder.)

'Arctan' (2 bundles, some pages dated 1955). 'EXAPP' (2 bundles).

Four bundles of notes: '(D.L.) Digital Division'. 'Digitwise formula'. 'D.L. Exp.'. 'Elem. Fns.'

Miscellaneous untitled notes, mainly of approximations to elementary functions.

This was the 'Garry Project' for the design of a Quoick surge shaft, for Sir William Halcrow and Partners. Bundle of notes and calculations relating to the project from Sir William Halcrow and Partners, December 1951-January 1952. Manuscript and typescript versions of Strachey's description of 'Surge Shaft routine' and 'Fundamental equations'. Eight bundles of notes, calculations, routines.

Correspondence and papers relating to the Ising model of ferromagnetism, a problem suggested to Strachey by S.P. Frankel, California Institute of Technology, and worked out with the help of K.W. Huddart. Folder includes correspondence and 6 bundles of notes, calculations and routines, and a computer printout of a program with Strachey's comments.

Notes and calculations for a routine of this name for M.U.C., apparently based on 'Equations of Equilibrium for Three-Stage Let-Down of Kuwait Crude' (enclosed).

'2 digit mult[iplier] with 1 adder'. 'F.P.C. Divider. Proof of algorithm'. 'F.P.C. Division Algorithm'. 'General Division Processes'. 'Fast Division by 3'. 'Multiplication'. 'Slow signed multiplier'.

'3 - address code' (3 bundles).

Bundles of notes and calculations, with titles as follows: 'Decimal conversions' 'Ternary Logical Units' 'Counters' 'Search Register' 'Tape Input (Magnetic and Paper)' Some loose pages, and a note by D. Gillies on 'Gillies Adder-Subtractor'.

Folder of miscellaneous routines with Strachey's manuscript note of contents on the cover. These are tested routines of square root, exponentials, logs, sin/cos, arcton, and input-output steering routine.

Routine called 'R.C.S. [Routine Changing Sequence]. Notes, calculations and test. This may be Strachey's first scheme for calling routines (Dr. C. Phelps's note on the work is included in the folder.)

Folder of correspondence, drafts and calculations and Strachey's proposals. Includes commercial literature from Creed & Company on teleprinters, suggested models for codes (some by Strachey, others annotated by him), notes of discussions between Ferranti and the National Research Development Corporation, drafts and calculations by Strachey and others, comments on Strachey's codes, correspondence on articles. Strachey's outgraphs draft on 'F.P.C. Tape Code', 10…

Duplicated copies of Pegasus Input and Output Teleprinter Code (December 1954) and F.P.C. tape code, with many manuscript corrections and annotations by Strachey. These are based on, but not identical with the draft in MS. Eng. misc. b. 281/D.70 above. Dr. C. Phelps notes that the eventual code adopted came to light for the first time in Strachey's scribbled changes on page 6 of the document.