| Description | Date | Identifier | |
| Committee opinion on the design of a scuttle dash and the redesign of hand levers. | 15th Jan 1912 | Box 6 \ 5 05-page08 | |
| Departmental memo querying the relocation of the change speed quadrant to assist coachbuilders. | 15th Jan 1912 | Box 6 \ 5 05-page09 | |
| Extract from a letter regarding Lord Herbert Scott's suggestion to move the change gear quadrant to assist coach builders. | 23th Jan 1912 | Box 6 \ 5 05-page10 | |
| Positioning of the change gear quadrant to suit coach builders. | 1st Feb 1912 | Box 6 \ 5 05-page11 | |
| Instruction regarding a special short set of levers. | 13th Sep 1912 | Box 6 \ 5 05-page12 | |
| Departmental memo regarding the position of the change gear quadrant and levers. | 13th Sep 1912 | Box 6 \ 5 05-page13 | |
| Wear and rattling on change speed levers and proposing a solution. | 3rd Apr 1912 | Box 6 \ 5 05-page14 | |
| Departmental memo requesting action, with an included sample lever. | 18th Apr 1912 | Box 6 \ 5 05-page15 | |
| To Mr Bailey regarding a wear issue on a hand lever reported by the Repair Shop. | 18th Apr 1912 | Box 6 \ 5 05-page16 | |
| Awkward handling of the short hand brake lever and requesting a review for potential modifications. | 27th Sep 1912 | Box 6 \ 5 05-page17 | |
| Internal instruction memo to Mr. Royce regarding design modifications for Quadrant Brackets on a 4-speed gearbox. | 15th Oct 1913 | Box 6 \ 5 05-page18 | |
| Instruction memo to Mr. Royce regarding two design schemes for a reverse stop mechanism. | 15th Oct 1913 | Box 6 \ 5 05-page19 | |
| Instruction memo regarding a delay and a proposed single spring scheme for a 4-speed side lever. | 15th Oct 1913 | Box 6 \ 5 05-page20 | |
| Design and fit of change speed levers. | 30th Oct 1913 | Box 6 \ 5 05-page21 | |
| Potential issues with a fixed quadrant design for side levers on a 4-speed gearbox. | 3rd Nov 1913 | Box 6 \ 5 05-page22 | |
| To Mr. Royce requesting his critique on a quadrant bracket and discussing a drop forging issue. | 8th Nov 1913 | Box 6 \ 5 05-page23 | |
| Mr. Spinney's suggestion for lever selection based on steering type and the position of the brake lever in enclosed cars. | 14th Nov 1913 | Box 6 \ 5 05-page24 | |
| Removal of the 'B' position from the side levers. | 4th Mar 1913 | Box 6 \ 5 05-page25 | |
| Compromises for different steering types and related engine and chassis design issues. | 17th Dec 1913 | Box 6 \ 5 05-page26 | |
| Changing the positions of the side lever mechanism. | 24th Dec 1913 | Box 6 \ 5 05-page27 | |
| Standard arrangement of side levers for new chassis designs. | 26th Mar 1914 | Box 6 \ 5 05-page28 | |
| Modifications and issues with a side lever mechanism, front springs, and an undershield. | 11th May 1914 | Box 6 \ 5 05-page29 | |
| Request from agents to 'set out' the change speed levers a little more. | 20th May 1914 | Box 6 \ 5 05-page30 | |
| Request from Belgian agents to supply L to E type cars with 'A' and 'B' type steering. | 10th Sep 1914 | Box 6 \ 5 05-page31 | |
| Complaint from Belgian Agents about insufficient space around side levers on Torpedo type bodies. | 21th Jul 1914 | Box 6 \ 5 05-page32 | |
| Positioning of the change gear and brake levers. | 21th Jul 1914 | Box 6 \ 5 05-page33 | |
| Confirming information regarding the Side Lever Mechanism is correct. | 21th Jul 1914 | Box 6 \ 5 05-page34 | |
| Instruction sheet detailing the status of a list of cars supplied to Belgium. | 6th Oct 1918 | Box 6 \ 5 05-page35 | |
| Letter addressing a complaint about insufficient space between the gear and brake side levers on Torpedo body cars. | 22th Jul 1914 | Box 6 \ 5 05-page36 | |
| Fitting, adjustment, and replacement of 'set in' and 'set out' type levers on car bodies. | 22th Jul 1914 | Box 6 \ 5 05-page37 | |
| The concluding page of a typed letter, marked as page 3. | 22th Jul 1914 | Box 6 \ 5 05-page38 | |
| The positioning of the brake lever on light narrow torpedo bodies. | 22th Jul 1914 | Box 6 \ 5 05-page39 | |
| From Mr. Royce to Mr. Johnson regarding steering and chassis types, including the London to Edinburgh and Alpine Eagle models. | 24th Jul 1914 | Box 6 \ 5 05-page40 | |
| Distributing information on 'A' & 'B' type steering for 'L to E' type cars. | 24th Jul 1914 | Box 6 \ 5 05-page41 | |
| Modifications to the side lever mechanism for Belgian Agents and English Coachbuilders. | 23th Jul 1914 | Box 6 \ 5 05-page42 | |
| Request from Belgian Agents for more space between the brake and change speed levers. | 28th Jul 1914 | Box 6 \ 5 05-page43 | |
| Clarifying information sent to Belgian Agents regarding change gear and side brake levers. | 29th Jul 1914 | Box 6 \ 5 05-page44 | |
| Supply and setting of levers for torpedo bodies, referencing communication with Belgian agents. | 29th Jul 1914 | Box 6 \ 5 05-page45 | |
| Request from Messrs. Parkers for a wider 'set out' side lever mechanism of the Austrian type. | 9th Mar 1915 | Box 6 \ 5 05-page46 | |
| Instruction sheet for car 6 IB, asking whether to follow the same procedure as car 12 ED or create a new design. | 9th Mar 1915 | Box 6 \ 5 05-page47 | |
| Alterations to the side lever mechanism due to a reduction in dashboard width. | 15th Aug 1924 | Box 6 \ 5 05-page48 | |
| Availability of special side levers for 'V' and 'W' series chassis. | 29th May 1925 | Box 6 \ 5 05-page49 | |
| The 'W' Series Side Lever Mechanism and the urgent need for the latest instructions. | 10th Jun 1925 | Box 6 \ 5 05-page50 | |
| Introduction of a new side lever mechanism for the 40/50 HP chassis. | 18th Oct 1926 | Box 6 \ 5 05-page51 | |
| Standardisation of chassis parts, specifically the incorporation of a 'B' type gear lever on a chassis with 'C' steering. | 20th Nov 1926 | Box 6 \ 5 05-page52 | |
| Modified hand brake lever design to provide greater clearance, referencing various car models and design trends. | 17th Jun 1930 | Box 6 \ 5 05-page53 | |
| Instructing an experimental set of side levers for the 25 HP chassis, noting a spacing issue. | 15th Oct 1930 | Box 6 \ 5 05-page54 | |
| Modification to the side levers on the 20/25 model. | 2nd Feb 1931 | Box 6 \ 5 05-page55 | |
| Altering the side levers for the 20/25 HP chassis and questioning if the change applies to the Phantom II. | 20th Feb 1931 | Box 6 \ 5 05-page56 | |
| Issues and a proposed solution for the set-in side levers on the P.2 and 20/25.HP models. | 20th Apr 1931 | Box 6 \ 5 05-page57 | |
| The cancellation of Standardisation Sheet X.No.5231 for set-in levers on the Phantom II and 20/25 HP chassis. | 16th Apr 1931 | Box 6 \ 5 05-page58 | |
| The decision not to modify Set-in Levers for 'C' columns due to low demand. | 10th Apr 1931 | Box 6 \ 5 05-page59 | |
| Modification and position of side levers on a 20/25 HP chassis, seeking clarification on changes made. | 10th Apr 1931 | Box 6 \ 5 05-page60 | |
| Cancelling a proposed alteration to gear and brake lever positions for the 'S' series chassis. | 10th Apr 1931 | Box 6 \ 5 05-page61 | |
| Proposal to modify the side brake lever on the 20/25 'T' Series chassis to increase clearance. | 19th May 1931 | Box 6 \ 5 05-page62 | |
| Refusing a request to provide set-in brake levers for the 20/25 HP 'W' Series model. | 11th May 1931 | Box 6 \ 5 05-page63 | |
| Positioning of side levers, knobs, and gear lever components for models J.3 and Per. | 8th Apr 1932 | Box 6 \ 5 05-page64 | |
| Adding a rubber cushioning pad to the gear lever handle to prevent noise from vibration. | 11th Sep 1933 | Box 6 \ 5 05-page65 | |
| Design evolution of the Straight 8 Engine from a two-valve ramp head to a turbulent head design. | 7th May 1934 | Box 6 \ 6 06-page001 | |
| Specification document for a Straight '8' Engine, detailing construction, cylinder head, and porting. | 7th May 1934 | Box 6 \ 6 06-page002 | |
| Technical specification document detailing engine components including induction, exhaust, valve gear, and crankshaft. | 7th May 1934 | Box 6 \ 6 06-page003 | |
| Page 3 of a report detailing connecting rods, wheelcase auxiliary drives, and the lubrication system. | 7th May 1934 | Box 6 \ 6 06-page004 | |
| Note detailing developments for the water cooling system and a handwritten addendum for the induction system. | 30th Apr 1934 | Box 6 \ 6 06-page005 | |
| Cross-section diagram of a Straight Eight Engine with labelled components. | 30th Apr 1934 | Box 6 \ 6 06-page006 | |
| Secret memo requesting constructive criticism on the Straight Eight Engine. | 9th May 1934 | Box 6 \ 6 06-page007 | |
| Secret memo suggesting the use of the codename 'Wraith' for a project, referencing the handling of the 'Spectre' project. | 10th May 1934 | Box 6 \ 6 06-page008 | |
| Technical memorandum discussing the 'STRAITS' engine design, focusing on the cylinder head and induction system. | 11th Aug 1934 | Box 6 \ 6 06-page009 | |
| Engine design choices for valve gear, silencers, camshafts, and crankshafts, with comparisons to American models. | 11th Nov 1934 | Box 6 \ 6 06-page010 | |
| Engineering discussion on connecting rods, bearings, front drive design, and piston lubrication. | 11th Aug 1926 | Box 6 \ 6 06-page011 | |
| Carburation being unaffected by the deletion of radiator shutters and plans to test a mesh grill. | 25th Nov 1934 | Box 6 \ 6 06-page012 | |
| Proposal of 'stepping' Main Journal sizes for boring operations versus the existing 'Peregrine' scheme. | 12th May 1936 | Box 6 \ 6 06-page013 | |
| The implications of using hydraulic feed for rough and finish grinding operations on crankshafts. | 12th May 1934 | Box 6 \ 6 06-page014 | |
| Comparing the dimensions of an 8-cylinder Daimler with Rolls Royce models including the 20/25, Phantom and Wraith. | 5th Jun 1936 | Box 6 \ 6 06-page015 | |
| Design of a Straight '8' engine for the Wraith chassis, evaluating the suitability of a centrifugal blower. | 21th Jul 1934 | Box 6 \ 6 06-page016 | |
| Report discussing the potential development of an acquired engine, comparing it to the 4-litre Bentley and suggesting future prototypes. | 21th Jul 1934 | Box 6 \ 6 06-page017 | |
| Proposal discussing the introduction of a novel power unit alongside existing safety-first designs for the Wraith and Bentley programmes. | 21th Jul 1934 | Box 6 \ 6 06-page018 | |
| Querying potential issues with a variable level oil intake for the Wraith oil sump, regarding false readings and oil condition. | 12th Nov 1934 | Box 6 \ 6 06-page019 | |
| Request regarding rig test results for a floating oil intake proposed for the Wraith model. | 12th Nov 1934 | Box 6 \ 6 06-page020 | |
| Test report on a B.W.P. Variable Level Oil Intake used as an oil level indicator. | 30th Nov 1934 | Box 6 \ 6 06-page021 | |
| The behaviour and testing of different oil level indicators in aerated oil. | 30th Nov 1934 | Box 6 \ 6 06-page022 | |
| Diagram illustrating three types of oil indicator used for a B.W.P. variable level indicator. | 19th Nov 1934 | Box 6 \ 6 06-page023 | |
| Provision of drawings for the Wraith engine starter motor and cylinder head. | 2nd Dec 1934 | Box 6 \ 6 06-page024 | |
| Re-issue of drawings for the Wraith Engine, correcting cylinder height and noting forthcoming drawings. | 15th Dec 1934 | Box 6 \ 6 06-page025 | |
| Information about the Buick heat regulating valve for potential use on the Wraith. | 21th Dec 1934 | Box 6 \ 6 06-page026 | |
| Secret memo detailing three drawings for the Wraith Engine concerning the crankcase, oil system, and cylinder head modifications. | 15th Jan 1935 | Box 6 \ 6 06-page027 | |
| New blueprints for Wraith Chassis components related to the crankshaft and camshaft drive system. | 17th Jan 1935 | Box 6 \ 6 06-page028 | |
| Secret memorandum detailing the final designs for getting the Wraith Engine on the test bed. | 31th Jan 1936 | Box 6 \ 6 06-page029 | |
| Request for correct sprocket details for the Wraith Chassis to secure the necessary milling cutters. | 14th Feb 1935 | Box 6 \ 6 06-page030 | |
| Secret memo detailing instructions for converting the Wraith engine to a larger bore. | 16th Aug 1935 | Box 6 \ 6 06-page031 | |
| Table detailing the particulars and specifications of various car engines. | 9th May 1938 | Box 6 \ 6 06-page032 | |
| Instructing a temporary stop to all work on the 'WRAITH' project. | 31th Oct 1935 | Box 6 \ 6 06-page033 | |
| Secret memo discussing engine design and chassis development for the Wraith model. | 14th Oct 1936 | Box 6 \ 6 06-page034 | |
| The feasibility and benefits of a Vee eight engine, comparing chassis layout, suspension, and production costs against straight-eight models. | 14th Oct 1935 | Box 6 \ 6 06-page035 | |
| Proposing an alternative engine to the nearly complete Wraith engine, considering Bentley chassis requirements. | 14th Oct 1935 | Box 6 \ 6 06-page036 | |
| Challenges and possibilities of fitting V-8 and 12-cylinder engines into the Wraith Chassis. | 15th Oct 1935 | Box 6 \ 6 06-page037 | |
| Layout of the Wraith chassis and the need to improve comfort to replace the 25 HP model. | 21th Oct 1935 | Box 6 \ 6 06-page038 | |
| Engine choices and chassis design for the Wraith model, with a focus on improving ride comfort and manoeuvrability. | 18th Oct 1935 | Box 6 \ 6 06-page039 | |
| Appendix comparing different engine configurations for the Wraith chassis based on desirable attributes. | 10th Oct 1935 | Box 6 \ 6 06-page040 | |
| Secret internal memorandum discussing future chassis and engine development for the Wraith and 20/25 models. | 17th Oct 1935 | Box 6 \ 6 06-page041 | |
| Future improvements to springing, steering, performance, and engine policy for Bentley and Wraith models. | 17th Oct 1935 | Box 6 \ 6 06-page042 | |
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