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The first drawing of the circular arrangement of the new engine.

Notation of units for Difference Engine No. 2. Sheet 1 of 2

Scribbling Book Volume X.

Plan of Difference Engine No. 2. Tracing of BAB A/164.

Scribbling Book Volume XV. Containing various developments of series for the Analytical Engine, molecules elliptic, and various developments.

General notation of the motions of the Difference Engine No. 2

Scribbling Book Vol XVI. Various analytical developments adapted to engine.

Solution of two simultaneous equations

Notation of units for Difference Engine No. 2.

Difference Engine No. 2. Addition carriage and mode of driving the axis. Tracing of BAB A/171.

General plan of Analytical Engine, quarter size.

Figure 3. Zero Apparatus No. 1. Improved arrangement of snails, figure wheels et cetera for design dated 27 September 1834 and also for a design dated 24 January 1835. Elevation.

Sketch 13. General arrangement, circular. Showing 30 variables, 5 barrels with reducing apparatus, punch card mechanism, printing apparatus. Notes introduction of great bevel wheel 18 March 1837.

Plan of inking, printing and stereotype apparatus. Tracing of BAB A/173

Scribbling Book Volume V. Important matter of history in the Analytical Engine.

Opened out view of figure wheels, 1-42.

General plan and detail of the driving of the calculating part of Difference Engine No. 2. Tracing of BAB A/161.

Mill counting apparatus. Consecutive plan.

Elevation of Difference Engine No. 2.

Sketch of a plan for reserving the carriages.

Notation of a formula for multiplication

Store variable selectors. Superseding drawing No 2.

Drawing of the Difference Engine

Mill counting apparatus. Consecutive elevation.

Wheels for driving the adding axes. Plan.

Plan of consecutive mill counting apparatus for General Plan 28. Plan, note.

Print apparatus as made in the large model.

Tool Book. Volume I. Discussion and sketches of tools.

First sketch of all the parts in plan of the right half to middle group of General Plan 28. Plan, elevation.

Plan, elevation and section of cross slide.

Plan and new method of counting off for mill counting apparatus. Elevation, detail.

Revised plan of mill. Sheet 27.

Plan of the calculating part with the means of conveying numbers to stereotype sectors. Tracing of BAB A/176.

Sketch No. 11, circular, arrangement. Shows 27 variables.

Plan 21, store on a rack. Arrangement.

General plan of the Analytical Engine, half size.

Untitled. This drawing is a cardboard model.

Scribbling Book Volume X

Untitled.[Rough sketches of machine parts and tools].

Experimental planing machine

Paper rollers of the printing apparatus for the Analytical and Difference Engines. Superseded. Plan, elevation.

Addition No. 4. Carriage No 6. Elevation and plan.

Lifters for selecting the multiple of the Multiplicand or Divisor. Plan, two elevations.

Plan of part of framing of Drawing 161. Tracing of BAB A/161.

Apparatus for combining incommensurable cycles. Plan, elevation.

History.

Sketch of drilling machine. Details.

Untitled. Plan of the universal and general locking plates. Plan and elevation of the locked arms.

Plan of part of framing of Drawing 161. Tracing of BAB A/161.

Parts of slide for the Planing machine. Plan, elevation