| Description | Date | Identifier | |
| Preliminary tests of an EAC fixed choke type carburetter. | 29th May 1924 | Box 72 \ 1 scan0212 | |
| Continuation of a report on experiments with a Knave carburetter, needle valves, and vaporiser. | 29th May 1924 | Box 72 \ 1 scan0213 | |
| Comparing an E.A.C. fixed choke carburetter against a Knave type, including a diagram of an alteration to the deflector on the air valve. | 29th May 1924 | Box 72 \ 1 scan0214 | |
| Requesting a report on a series of checks for an EAC Carburetter on vehicle 93-NK. | 13th Oct 1924 | Box 72 \ 1 scan0215 | |
| The 'Seagull' engine camshaft, bearings, and oil pump drive, referencing drawing No. LeC.1660. | 22th Dec 1922 | Box 72 \ 1 scan0216 | |
| Design of the 'Seagull' cylinder head and valve rocker gear. | 10th Jan 1923 | Box 72 \ 1 scan0217 | |
| Design notes regarding the valve push rods and rocker mechanism for an engine. | 18th Jan 1923 | Box 72 \ 1 scan0218 | |
| Modifications and specifications for the 'Seagull' valve rocker details. | 18th Jan 1923 | Box 72 \ 1 scan0219 | |
| Calculations for the exact lift of a Seagull Valve Rocker. | 19th Jan 1923 | Box 72 \ 1 scan0220 | |
| The E.A.C.1 engine, comparing camshafts and investigating fuel distribution issues. | 29th Oct 1923 | Box 72 \ 1 scan0221 | |
| Performance graph showing power output and fuel consumption for an E.A.C. engine with a Knave carburetter. | 27th Oct 1923 | Box 72 \ 1 scan0222 | |
| Secret internal memo requesting models of E.A.C. valve gear parts for inspection and querying the type of push rods used in tests. | 19th Jan 1924 | Box 72 \ 1 scan0223 | |
| Meeting notes on engine development, covering cam timing, carburetters, exhaust systems, and detonation issues. | 1st Mar 1924 | Box 72 \ 1 scan0224 | |
| Drawings for valve lift curves with lower lift, detailing new dimensions for cam and valve lift. | 6th Jun 1924 | Box 72 \ 1 scan0225 | |
| Tests with lower lift cams. | 9th Sep 1924 | Box 72 \ 1 scan0226 | |
| The results of tests with a low lift camshaft on an EAC engine. | 17th Sep 1924 | Box 72 \ 1 scan0227 | |
| Oscilloscope test results for valve bounce on Engine 1-EAC-11 with a high lift camshaft at various speeds. | 19th Sep 1924 | Box 72 \ 1 scan0228 | |
| Valve bounce characteristics of engine 1-EAC-11 with a low lift camshaft at various speeds. | 19th Sep 1924 | Box 72 \ 1 scan0229 | |
| Graph comparing the power curves of two different camshafts (High Lift vs Low Lift) on an E.A.C. engine. | 16th Sep 1924 | Box 72 \ 1 scan0230 | |
| Graph comparing high and low lift profiles for EAC Inlet and Exhaust Camshafts. | 17th Sep 1924 | Box 72 \ 1 scan0231 | |
| Adoption of a low lift cam over a high lift cam and the feasibility of modifying existing parts. | 15th Dec 1924 | Box 72 \ 1 scan0232 | |
| Front floorboards blowing up on an experimental E.A.C. car at speed. | 2nd Apr 1924 | Box 72 \ 1 scan0233 | |
| Inquiry regarding the failure of fittings used to secure the front floorboards on an experimental car. | 27th Mar 1924 | Box 72 \ 1 scan0234 | |
| Clarifying that the floorboards which blew up on an experimental car were arranged by the coachbuilder, not by R.R. design. | 7th Apr 1924 | Box 72 \ 1 scan0235 | |
| Proposed dimensions for a bonnet, radiator, and dash for model EAC.2, and requesting a mock-up. | 1st Aug 1924 | Box 72 \ 1 scan0236 | |
| Proposed scheme for stiffening the scuttle armature on various car models. | 15th Jul 1926 | Box 72 \ 1 scan0237 | |
| Modifications to the 40/50 chassis shock absorbers and frame. | 21th Jun 1924 | Box 72 \ 1 scan0238 | |
| Fitting and modification of hydraulic shock dampers on the rear of a vehicle. | 7th Jun 1926 | Box 72 \ 1 scan0239 | |
| Adaptation of a forward support bracket for hydraulic shock dampers. | 16th Jul 1926 | Box 72 \ 1 scan0240 | |
| Secret memo detailing a proposal for magneto ignition wiring to minimize chassis alteration. | 25th Feb 1924 | Box 72 \ 1 scan0241 | |
| Secret memorandum discussing an arrangement for Magneto Wiring. | 4th Mar 1924 | Box 72 \ 1 scan0242 | |
| Modifications to wiring and fittings to accommodate the new position of the dynamo on the engine. | 14th Mar 1924 | Box 72 \ 1 scan0243 | |
| Secret memo detailing electrical equipment faults on 40/50 cars at Chateauroux. | 25th Jun 1924 | Box 72 \ 1 scan0244 | |
| Query regarding Rapson tyre dimensions to check for clearance with the wings and potential damage to an electric cable. | 28th Jun 1924 | Box 72 \ 1 scan0245 | |
| Cooling system modifications for the 40/50 HP chassis for the Australian market. | 20th Apr 1925 | Box 72 \ 2 scan0001 | |
| Cover note for an attached report concerning overheating on 40/50 cars. | 28th Apr 1925 | Box 72 \ 2 scan0002 | |
| Overheating troubles in Australia, comparing a single branch exhaust system against a two-branch system on a 40/50 engine. | 9th Apr 1925 | Box 72 \ 2 scan0003 | |
| Potential overheating issues with the 40/50 HP model, car 67-AU, focusing on the exhaust butterfly baffle. | 9th Apr 1925 | Box 72 \ 2 scan0004 | |
| The overheating and boiling conditions of a 40/50 model car. | 9th Apr 1925 | Box 72 \ 2 scan0005 | |
| Engine overheating in 40/50 cars, particularly concerning the effect of 4-wheel brakes. | 28th Apr 1925 | Box 72 \ 2 scan0006 | |
| Page discussing vehicle overheating, braking systems, and climate-specific modifications. | 28th Apr 1925 | Box 72 \ 2 scan0007 | |
| Overheating issues in 40/50 HP cars, comparing models with and without 4-wheel brakes. | 28th Apr 1925 | Box 72 \ 2 scan0008 | |
| Clarifying that the standard pistons fitted to a New Phantom Chassis for Australia are correct and will not be changed. | 19th May 1925 | Box 72 \ 2 scan0009 | |
| Spare wheel carriers, front engine suspension, and bumpers. | 12th Mar 1926 | Box 72 \ 2 scan0010 | |
| Clarifying terminology and specifications for springs intended for the Australian market. | 13th May 1927 | Box 72 \ 2 scan0011 | |
| Clarifying specifications for car springs intended for the Australian market. | 18th May 1927 | Box 72 \ 2 scan0012 | |
| Confirming stronger springs for a car destined for Australia, clarifying passenger capacity. | 27th May 1927 | Box 72 \ 2 scan0013 | |
| Use of 20% stiffer chassis springs for cars in Australia. | 24th Jun 1927 | Box 72 \ 2 scan0014 | |
| Various mechanical faults and safety concerns including steering wobble, misfiring, and cars turning over. | 30th Aug 1927 | Box 72 \ 2 scan0015 | |
| Letter detailing a car accident, including the driver's explanation and a damage report. | 12th Aug 1927 | Box 72 \ 2 scan0016 | |
| List of damages to a vehicle, this is page two of the document. | 11th Jun 1927 | Box 72 \ 2 scan0017 | |
| Accident report for a 40/50 HP Coupe, chassis 45-NC. | 11th Jun 1927 | Box 72 \ 2 scan0018 | |
| Accident report detailing a car overturning after hitting a portion of soft sand on the road. | 1st Feb 1927 | Box 72 \ 2 scan0019 | |
| Accident report concerning a car that turned over. | 6th Aug 1927 | Box 72 \ 2 scan0020 | |
| Increasing horsepower for 20 HP and 40/50 HP models for the Australian market, weighing against altering the back axle ratio. | 31th Aug 1927 | Box 72 \ 2 scan0021 | |
| Complaints of petrol spillage from the side tank filler on 40/50 HP cars and a proposed solution. | 31th Aug 1927 | Box 72 \ 2 scan0022 | |
| Customer's modification to the starter pedal to prevent accidental engagement by a passenger. | 31th Aug 1927 | Box 72 \ 2 scan0023 | |
| Future fixing for bumpers on the chassis. | 17th Oct 1927 | Box 72 \ 2 scan0024 | |
| Australian accidents discussing high-speed wobble, tyre recommendations and steering control. | 17th Oct 1927 | Box 72 \ 2 scan0025 | |
| The need for bumper bars and suggestions for redesigning tail lamp and number plate assemblies for cars in Australia. | 6th Sep 1927 | Box 72 \ 2 scan0026 | |
| Modification for reducing front braking on 40/50 HP cars. | 7th Oct 1927 | Box 72 \ 2 scan0027 | |
| 'spitting in silencer' issues, identifying badly bedding butterfly throttles and excess end clearance as the cause. | 17th Oct 1927 | Box 72 \ 2 scan0028 | |
| Alarming trend of former owners purchasing American cars instead of new Rolls-Royces. | 6th Jan 1928 | Box 72 \ 2 scan0029 | |
| Critique on lost sales in Australia due to failing to adopt conveniences found in competing American cars. | 28th Apr 1925 | Box 72 \ 2 scan0030 | |
| Confidential letter discussing the reasons why previous owners are now purchasing American cars. | 6th Jan 1928 | Box 72 \ 2 scan0031 | |
| Loss of sales to American competitors due to a lack of modern conveniences and features. | 28th Jan 1926 | Box 72 \ 2 scan0032 | |
| Potential power and exhaust modifications for the 20 HP chassis to improve performance in Australian conditions. | 10th Jan 1925 | Box 72 \ 2 scan0033 | |
| Query regarding the repair options for a damaged steering column on chassis GLK68, asking for an opinion on stretching versus replacing the part. | 11th Jan 1928 | Box 72 \ 2 scan0034 | |
| Inquiry regarding the placement of petrol traps on the New Phantom and a follow-up on high-speed wobbles. | 12th Jan 1928 | Box 72 \ 2 scan0035 | |
| Australian market feedback on car design, proposing modifications to the 20 HP model based on customer preference. | 16th Jan 1925 | Box 72 \ 2 scan0036 | |
| Letter proposing a modification to the 20 HP car's scuttle and dashboard support to address issues with creaks and groans. | 16th Jan 1928 | Box 72 \ 2 scan0037 | |
| Suggestion to address the unsightliness of rusting silencer snouts on cars by using rustless steel, plating or coslettising. | 16th Jan 1928 | Box 72 \ 2 scan0038 | |
| Suggestion to increase rear passenger room by widening the wheel track to address customer complaints about lack of space. | 16th Jan 1928 | Box 72 \ 2 scan0039 | |
| Letter discussing suspension experiments, spring camber, and calculations for poundage for cars in Australian conditions. | 31th Jan 1928 | Box 72 \ 2 scan0040 | |
| Suspension modifications and a novel method for measuring rear-seat ride comfort. | 28th Aug 1926 | Box 72 \ 2 scan0041 | |
| Testing methods, spring ratings, and passenger weight distribution calculations for car suspension. | 28th Aug 1926 | Box 72 \ 2 scan0042 | |
| Disadvantages of using two dashboards and advocating for semi-isolation in car body construction. | 7th Mar 1928 | Box 72 \ 2 scan0043 | |
| Column failure and the future design change to increase its diameter. | 10th Mar 1928 | Box 72 \ 2 scan0044 | |
| Battery charging issues in Australia and proposing automatic control for charging rates and fan speed. | 17th Apr 1928 | Box 72 \ 2 scan0045 | |
| Modifications for clutch lubrication, oil leakage on Phantom engines, and the engine undershield. | 21th Jan 1929 | Box 72 \ 2 scan0046 | |
| Spare wheel carriers and luggage grids for the Phantom II model, specifically for chassis sent to Australia. | 28th Jan 1930 | Box 72 \ 2 scan0047 | |
| Letter to Claude Johnson regarding production of left-hand drive cars and development of the 'New Phantom' for the Springfield Chassis. | 15th Sep 1925 | Box 72 \ 2 scan0048 | |
| Reasons for temporarily deferring the incorporation of servo and front brakes. | 15th Sep 1925 | Box 72 \ 2 scan0049 | |
| Discontinuation of high-pressure tires and the adoption of low-pressure tires as standard equipment. | 15th Sep 1925 | Box 72 \ 2 scan0050 | |
| Letter from Rolls-Royce of America detailing impressions of the Phantom engine after 3000 miles of testing. | 15th Oct 1925 | Box 72 \ 2 scan0051 | |
| Issues with a specific valve, comparing water-jacketed and exhaust-heated throttles, and engine warm-up performance. | 15th Oct 1925 | Box 72 \ 2 scan0052 | |
| Engine and drivetrain issues including knocking, detonation, carburation, and clutch performance. | 15th Oct 1925 | Box 72 \ 2 scan0053 | |
| Performance issues and potential improvements for the clutch brake and clutch pedal. | 15th Oct 1925 | Box 72 \ 2 scan0054 | |
| Letter from the American branch discussing choke valve, detonation, and overheating issues on the Phantom engine. | 2nd Nov 1925 | Box 72 \ 2 scan0055 | |
| Letter discussing potential overheating in a cylinder and proposing a design change to the water inlet on the Phantom engine. | 2nd Nov 1925 | Box 72 \ 2 scan0056 | |
| Letter quoting a cable about a 12-MC engine running on after being switched off, suggesting potential faults and requesting a report. | 9th Nov 1925 | Box 72 \ 2 scan0057 | |
| Follow-up request for information regarding the New Phantom Chassis engine continuing to run after being switched off. | 10th Dec 1925 | Box 72 \ 2 scan0058 | |
| Complaint from America regarding the New Phantom engine continuing to run after switching off. | 11th Nov 1925 | Box 72 \ 2 scan0059 | |
| Lighting system for the New Phantom Car in America. | 30th Dec 1925 | Box 72 \ 2 scan0060 | |
| Letter regarding issues with the New Phantom's 12-volt generator causing light bulbs to fail due to high voltage. | 11th Dec 1925 | Box 72 \ 2 scan0061 | |
| Seeking agreement to supply information to America regarding the New Phantom car's 12-volt generator. | 7th Jan 1926 | Box 72 \ 2 scan0062 | |
| Letter from the American branch to the UK branch discussing development updates for the Phantom model. | 8th Jan 1926 | Box 72 \ 2 scan0063 | |
| Engine issues such as dieseling, detonation, and potential solutions for bushings and heater valves. | 8th Jan 1926 | Box 72 \ 2 scan0064 | |
| Modifications and issues with the Stewart Tank, clutch, generator, and intake bend on a test vehicle. | 8th Jan 1926 | Box 72 \ 2 scan0065 | |
| Requesting information on axle ratio tests for Phantom chassis being sent to America. | 24th Feb 1926 | Box 72 \ 2 scan0066 | |
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