| Description | Date | Identifier | |
| Cylinder expansion and oiling for the EAC engine, including temperature measurements and expansion calculations. | 16th May 1925 | Box 180 \ M3 \ M3.1 img014 | |
| Oil consumption issues related to piston design and testing. | 19th May 1925 | Box 180 \ M3 \ M3.1 img015 | |
| EAC 'V' Series oil consumption, comparing performance in France and England and detailing a modification to the low-pressure oil system. | 4th Jun 1925 | Box 180 \ M3 \ M3.1 img016 | |
| Investigating over-oiling in an EAC engine and a proposed test approved by Mr. Royce. | 6th Jun 1925 | Box 180 \ M3 \ M3.1 img017 | |
| 'W' series body subframe, discussing production delays and suggesting the use of a modified 40/50 chassis. | 1st Jan 1925 | Box 180 \ M3 \ M3.2 img001 | |
| Implications of a stepped or recessed dashboard design. | 17th Jan 1925 | Box 180 \ M3 \ M3.2 img002 | |
| Design and limitations of 'V+W' series undershields and guards. | 29th Jun 1919 | Box 180 \ M3 \ M3.2 img003 | |
| Modifications to the 'V' Series fabric engine coupling and the epicyclic starter gear on the gearbox. | 1st Jan 1925 | Box 180 \ M3 \ M3.2 img004 | |
| Design modifications for gear teeth, shaft strength, and bearings. | 30th Nov 1943 | Box 180 \ M3 \ M3.2 img005 | |
| The urgent need for a permanent fabric coupling on a gearbox shaft and technical suggestions for the sequence starter. | 1st Oct 1925 | Box 180 \ M3 \ M3.2 img006 | |
| Design of a throttle governor, comparing the 40/50 chassis with the EAC model. | 1st Jan 1925 | Box 180 \ M3 \ M3.2 img007 | |
| Approved alteration to a switch box, contingent on further agreement. | 17th Jan 1935 | Box 180 \ M3 \ M3.2 img008 | |
| Simplified ignition switch scheme, detailing options for running on magneto, battery, or both, with or without charging. | 19th Jan 1925 | Box 180 \ M3 \ M3.2 img009 | |
| Requesting agreement on a proposed modification to switchbox contacts. | 21th Jan 1925 | Box 180 \ M3 \ M3.2 img010 | |
| Secret memo about testing a carburetter with a modified high-speed throat and air valve. | 21th Jan 1925 | Box 180 \ M3 \ M3.2 img011 | |
| Revised body subframe for the 40/50 model, outlining modifications and requirements for various body types. | 27th Jan 1925 | Box 180 \ M3 \ M3.2 img012 | |
| Various ignition control schemes and magneto options for the 'V' Series engine. | 1st Jan 1925 | Box 180 \ M3 \ M3.2 img013 | |
| Secret memo regarding the erection of 'V' series underguards and a clarification on which chassis model to use. | 28th Feb 1925 | Box 180 \ M3 \ M3.2 img014 | |
| The necessity of new side levers and specifications for a 4-door light cabriolet body on a steel underframe. | 3rd Mar 1925 | Box 180 \ M3 \ M3.2 img015 | |
| With a diagram proposing a design modification for a steering lever, replacing serrations with a solid-forged lever and taper bolt flange. | 9th May 1925 | Box 180 \ M3 \ M3.2 img016 | |
| Secret internal memo discussing the weight, inertia, and potential modifications to a clutch and flywheel unit. | 13th Mar 1925 | Box 180 \ M3 \ M3.2 img017 | |
| Technical memo discussing piston failure, its causes, and proposed design modifications. | 16th Mar 1925 | Box 180 \ M3 \ M3.2 img018 | |
| Piston failure theory, scraper ring defects, and a proposed new piston ring design. | 1st Jan 1926 | Box 180 \ M3 \ M3.2 img019 | |
| Review with proposed modifications for an adjustable throttle lever. | 17th Mar 1925 | Box 180 \ M3 \ M3.2 img020 | |
| Proposed modifications to pistons, referencing drawings Lec. 2029 & 2030. | 1st Mar 1925 | Box 180 \ M3 \ M3.2 img021 | |
| Proposed modifications to pistons, referencing drawings LeC. 2029 and 2030. | 1st Mar 1925 | Box 180 \ M3 \ M3.2 img022 | |
| Secret internal memo proposing a design modification to piston X8040 with a supporting sketch. | 19th Mar 1925 | Box 180 \ M3 \ M3.2 img023 | |
| Modifications to a throttle governor control, focusing on opening angles, lever fouling, and roller design. | 23th Mar 1925 | Box 180 \ M3 \ M3.2 img024 | |
| Causes of and potential solutions for heavy steering. | 1st Mar 1925 | Box 180 \ M3 \ M3.2 img025 | |
| Blueprint for a revised 20HP piston, detailing a stronger web and a multiple scraper scheme to address over-oiling. | 23th Mar 1925 | Box 180 \ M3 \ M3.2 img026 | |
| Modifications to the throttle governor spring and an anti-rattling device for the generator drive. | 3rd Mar 1925 | Box 180 \ M3 \ M3.2 img027 | |
| Failure of a transmission coupling and potential solutions. | 31th Mar 1925 | Box 180 \ M3 \ M3.2 img028 | |
| Material stock for a future car production run and proposals for part weight reductions. | 26th Apr 1917 | Box 180 \ M3 \ M3.3 img001 | |
| Design specifications for brake straps, rear springs, wheel spokes, and the sourcing of alloy steels. | 29th Aug 1912 | Box 180 \ M3 \ M3.3 img002 | |
| Specifications for radiators, ignition coils, and electric starting equipment for a new car model. | 29th Aug 1912 | Box 180 \ M3 \ M3.3 img003 | |
| Proposed improvements to valve springs, carburettor, induction pipe, air pump, and brakes. | 23th Apr 1912 | Box 180 \ M3 \ M3.3 img004 | |
| Brake testing, instrument board arrangements, and a specific design for a speedometer drive. | 23th Apr 1912 | Box 180 \ M3 \ M3.3 img005 | |
| Re-usability of parts from car X.2048, focusing on its unorthodox gearbox and 6-volt generator. | 20th Jan 1918 | Box 180 \ M3 \ M3.3 img006 | |
| Communication regarding issues with ignition plugs, a magneto, and a needle valve, requesting replacement parts and advice. | 24th Jan 1918 | Box 180 \ M3 \ M3.3 img007 | |
| Engine running backwards on Chassis 7-CA, fuel pressure issues, and a sketched modification for the needle valve. | 30th Jan 1918 | Box 180 \ M3 \ M3.3 img008 | |
| Request to modify the cam on a magneto contact maker due to a failure caused by the swelling of its fibre. | 30th Jan 1918 | Box 180 \ M3 \ M3.3 img009 | |
| Surprising efficiency of a Lucas 20 lb starter motor test. | 25th Feb 1918 | Box 180 \ M3 \ M3.3 img010 | |
| Modifications made to improve the performance of a trembler on a coil. | 25th Feb 1918 | Box 180 \ M3 \ M3.3 img011 | |
| Hand-drawn schematic of a starter switch mechanism and its method of control. | 2nd Jul 1918 | Box 180 \ M3 \ M3.3 img012 | |
| The performance and fuel economy of car 7 CA, detailing carburettor settings and potential engine improvements. | 12th Mar 1918 | Box 180 \ M3 \ M3.3 img013 | |
| Performance of a trembler coil and a request for new four-volt and six-volt coils. | 26th Mar 1918 | Box 180 \ M3 \ M3.3 img014 | |
| Progress report for Automobiles Rolls-Royce (France) Ltd, detailing chassis sales figures from 1910 to 1913. | 21th Oct 1913 | Box 180 \ M3 \ M3.3 img015 | |
| European sales performance, market expansion, and business strategy for 1914. | 21th Oct 1913 | Box 180 \ M3 \ M3.3 img016 | |
| Business conditions in Austria and Russia, mentioning the Balkan war and the Alpenfahrt Trials. | 2nd Jul 1917 | Box 180 \ M3 \ M3.3 img017 | |
| Rejecting a design for a Piston Testing Rig and promising to provide a better alternative. | 2nd Jul 1917 | Box 180 \ M3 \ M3.3 img018 | |
| Policy on offering retrospective modifications for older chassis types. | 24th May 1919 | Box 180 \ M3 \ M3.3 img019 | |
| Seized brake cable forks on chassis 7 CA, with suggestions for design improvements and handwritten commentary on problem-solving approaches. | 1st Aug 1919 | Box 180 \ M3 \ M3.3 img020 | |
| List of recommended and non-recommended improvements for early 40/50 HP cars. | 26th Apr 1917 | Box 180 \ M3 \ M3.3 img021 | |
| Outlining various vehicle modifications and service suggestions. | 1st Aug 1912 | Box 180 \ M3 \ M3.3 img022 | |
| Comparison of the 'Condor', 'Eagle', and 'Falcon' aero engines against the Napier 'Lion' engine. | 22th Oct 1920 | Box 180 \ M3 \ M3.3 img023 | |
| Special four-volt trembler coil, detailing its design, test results, and comparison to a standard model. | 24th Feb 1920 | Box 180 \ M3 \ M3.3 img024 | |
| Experimental tests conducted on various trembler coils, detailing their specifications and performance. | 20th Feb 1920 | Box 180 \ M3 \ M3.3 img025 | |
| The testing and performance issues of electrical coils, tremblers, and condensers. | 24th Feb 1920 | Box 180 \ M3 \ M3.3 img026 | |
| The performance testing of various ignition coils and tremblers. | 24th Feb 1920 | Box 180 \ M3 \ M3.3 img027 | |
| The dispatch schedule for a dummy chassis and other components to the coachbuilder Messrs. Barkers. | 30th Sep 1924 | Box 180 \ M3 \ M3.4 img001 | |
| 10,000-mile brake test conducted in France on two cars. | 20th Mar 1924 | Box 180 \ M3 \ M3.4 img002 | |
| Vehicle failures, including broken front springs and criticisms of braking and steering safety. | 18th Jul 1924 | Box 180 \ M3 \ M3.4 img003 | |
| Issues with brake wear and low-speed steering wobble. | 19th Jul 1924 | Box 180 \ M3 \ M3.4 img004 | |
| Engine modifications, including issues with the exhaust pipe, engine guards, and servo gear noise. | 18th Jul 1924 | Box 180 \ M3 \ M3.4 img005 | |
| Serious accident with a 35-PK open touring car during tests in France. | 1st Aug 1924 | Box 180 \ M3 \ M3.4 img006 | |
| High-speed steering and braking issues, including details of car accidents and ongoing tests. | 18th Aug 1924 | Box 180 \ M3 \ M3.4 img007 | |
| Accident involving car 35 FK in Vignoux-sur-Barangeon, France. | 13th Aug 1934 | Box 180 \ M3 \ M3.4 img008 | |
| Accident with a 4-wheel brake test car in France. | 25th Aug 1924 | Box 180 \ M3 \ M3.4 img009 | |
| Letter from A.J. Lidsey analysing the cause of an accident involving car 35-PK. | 21th Aug 1924 | Box 180 \ M3 \ M3.4 img010 | |
| Front spring failures during testing in France on chassis 9-PK, comparing springs from two different suppliers. | 23th Aug 1924 | Box 180 \ M3 \ M3.4 img011 | |
| Typed note regarding the testing of 12½% Firths springs and a meeting to discuss the particulars. | 1st Sep 1924 | Box 180 \ M3 \ M3.4 img012 | |
| Defending the department's work and expenditure on cars fitted with 4-wheel brakes and stronger springs. | 1st Sep 1924 | Box 180 \ M3 \ M3.4 img013 | |
| The compromise for spring stiffness for speed car models, balancing performance with comfort demands. | 1st Sep 1924 | Box 180 \ M3 \ M3.4 img014 | |
| Road spring breakage statistics from tests on various car models in France. | 1st Sep 1924 | Box 180 \ M3 \ M3.4 img015 | |
| The life of road springs, comparing road tests with bump tests. | 1st Sep 1924 | Box 180 \ M3 \ M3.4 img016 | |
| Engine overheating, comparing heat transfer to water in high versus low compression engines. | 1st Sep 1924 | Box 180 \ M3 \ M3.4 img017 | |
| The relative amounts of heat rejected to cooling water in an engine, referencing Ricardo's tests. | 12th Jul 1928 | Box 180 \ M3 \ M3.4 img018 | |
| Comparing the combustion chamber and engine performance of two car models. | 1st Sep 1924 | Box 180 \ M3 \ M3.4 img019 | |
| The issue of front brake thumping in four-wheel brake systems. | 10th Sep 1924 | Box 180 \ M3 \ M3.4 img020 | |
| Resolving a knocking or thumping sound in the brake system. | 10th Sep 1924 | Box 180 \ M3 \ M3.4 img021 | |
| Recommendation to add friction to the top support of links holding a balance lever, with a handwritten note on its successful implementation. | 10th Sep 1924 | Box 180 \ M3 \ M3.4 img022 | |
| Radiator and spring tests for a 40/50 HP car in France. | 1st Sep 1924 | Box 180 \ M3 \ M3.4 img023 | |
| Modifications to the radiator, bonnet, pistons, and pivot pin bushes. | 10th Sep 1924 | Box 180 \ M3 \ M3.4 img024 | |
| Braking systems, Hartford shock absorbers, and road spring testing. | 9th Sep 1924 | Box 180 \ M3 \ M3.4 img025 | |
| Experimental Department recommendation to send Woodhead springs to France for testing on the 9-PK and 98-NK cars. | 10th Sep 1924 | Box 180 \ M3 \ M3.4 img026 | |
| The bump test results for Woodheads 12.5% road springs, comparing their failure points to Firths springs. | 11th Sep 1924 | Box 180 \ M3 \ M3.4 img027 | |
| Tests with lower lift cams on an E.A.C. engine. | 19th Sep 1924 | Box 180 \ M3 \ M3.4 img028 | |
| Tests of a 118º low lift camshaft on an EAC engine No.1-EAC-11. | 17th Sep 1924 | Box 180 \ M3 \ M3.4 img029 | |
| Valve bounce observations at various speeds for an engine with a high lift camshaft. | 9th Sep 1924 | Box 180 \ M3 \ M3.4 img030 | |
| Valve bounce for engine 1-EAC-11 with a low lift camshaft. | 1st Sep 1924 | Box 180 \ M3 \ M3.4 img031 | |
| Graph comparing the power curves of two camshafts under identical conditions. | 16th Sep 1924 | Box 180 \ M3 \ M3.4 img032 | |
| Graph comparing high and low lift for E.A.C. inlet and exhaust camshafts. | 17th Sep 1924 | Box 180 \ M3 \ M3.4 img033 | |
| Two graphs comparing high lift and low lift cam profiles, with the lower graph identified as exhaust cams. | 17th Sep 1924 | Box 180 \ M3 \ M3.4 img034 | |
| Bump tests detailing fractures in Woodhead road springs. | 9th Sep 1924 | Box 180 \ M3 \ M3.4 img035 | |
| Comparing the hardness and life of spring top leaves from Woodhead and Firth. | 1st Sep 1924 | Box 180 \ M3 \ M3.4 img036 | |
| Secret internal memo about a delay with a dummy chassis, proposing solutions to get it to the coachbuilders. | 22th Sep 1924 | Box 180 \ M3 \ M3.4 img037 | |
| Analysis of the material composition and lifespan under load for six Woodhead springs. | 20th Sep 1924 | Box 180 \ M3 \ M3.4 img038 | |
| Report comparing Rapson and Dunlop tyres on mileage, ride hardness, and steering stability during 4-wheel brake tests. | 1st Sep 1924 | Box 180 \ M3 \ M3.4 img039 | |
| Windscreen failures experienced during a 10,000-mile test in France. | 23th Sep 1924 | Box 180 \ M3 \ M3.4 img040 | |
| Modifications to a wide and high bottom panel to prevent glass distortion. | 23th Sep 1924 | Box 180 \ M3 \ M3.4 img041 | |
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