| Description | Date | Identifier | |
| Noise amplification from discs fitted to wire wheels. | 23th Sep 1924 | Box 180 \ M3 \ M3.4 img042 | |
| Secret memo regarding the request for a covered body for an EAC.11 car, recommending either a Cabriolet or Saloon. | 24th Sep 1924 | Box 180 \ M3 \ M3.4 img043 | |
| Servo gear noise in 40/50 HP chassis fitted with 4-wheel brakes. | 24th Sep 1924 | Box 180 \ M3 \ M3.4 img044 | |
| Testing different servo gear arrangements and modifications to eliminate noise. | 24th Sep 1924 | Box 180 \ M3 \ M3.4 img045 | |
| Road tests of Firths springs and brakes, with a summary on frequent breakages of Induction and Extra Oil Pipes. | 1st Sep 1924 | Box 180 \ M3 \ M3.4 img046 | |
| Summarizing a 10,000-mile test on vehicle 9-PK. | 26th Sep 1924 | Box 180 \ M3 \ M3.4 img047 | |
| The performance of the exhaust, steering, and engine components. | 26th Sep 1924 | Box 180 \ M3 \ M3.4 img048 | |
| Various mechanical failures and issues observed during testing, including oil pipes, induction pipes, piston knocks, water pump, and suspension. | 26th Sep 1924 | Box 180 \ M3 \ M3.4 img049 | |
| Six matters that require modification. | 26th Sep 1924 | Box 180 \ M3 \ M3.4 img050 | |
| The slow-running performance of the E.A.C. engine compared to the standard 40/50 HP model. | 20th May 1924 | Box 180 \ M3 \ M3.4 img051 | |
| The failure of the original EAC 4-bladed sheetmetal fan. | 1st Apr 1928 | Box 180 \ M3 \ M3.5 img001 | |
| Modifications to car 93-NK for 'V' Series tests in France. | 1st Apr 1925 | Box 180 \ M3 \ M3.5 img002 | |
| Modifications and issues for various car components including valves, pedals and controls. | 1st Apr 1925 | Box 180 \ M3 \ M3.5 img003 | |
| Improvements to Series 'V' front springs following a 10,000-mile car test. | 13th Apr 1925 | Box 180 \ M3 \ M3.5 img004 | |
| 'EAC' steering comparing the force required to turn the wheels for different systems. | 1st Apr 1925 | Box 180 \ M3 \ M3.5 img005 | |
| Steering effort tests with varying tyre pressures and axle weights. | 1st Apr 1925 | Box 180 \ M3 \ M3.5 img006 | |
| Steering heaviness, particularly when reversing, detailing four tests conducted on steering gear components. | 1st Apr 1925 | Box 180 \ M3 \ M3.5 img007 | |
| Steering wheel effort, efficiency, and leverage analysis. | 6th Apr 1925 | Box 180 \ M3 \ M3.5 img008 | |
| Design of an anti-rattle dynamo drive, including an alternative spring arrangement. | 1st Apr 1925 | Box 180 \ M3 \ M3.5 img009 | |
| From 'R.' questioning the use of a stiff spring for the dynamo drive carrier shaft and suggesting a simpler alternative. | 15th Apr 1925 | Box 180 \ M3 \ M3.5 img010 | |
| Secret memorandum on the unsatisfactory life of Series 'V' front springs, recommending testing new experimental sets. | 6th Apr 1925 | Box 180 \ M3 \ M3.5 img011 | |
| Description of the features of the 12-volt electrical system on a 40/50s model. | 19th Apr 1925 | Box 180 \ M3 \ M3.5 img012 | |
| Tests on an EAC 'V' series car in France and the fitting of new Hardy couplings. | 15th Apr 1925 | Box 180 \ M3 \ M3.5 img013 | |
| Chassis 93-NK after a 3,000-mile test, detailing engine performance and component issues. | 1st Apr 1925 | Box 180 \ M3 \ M3.5 img014 | |
| Issues found in cylinders, exhaust pipes, undershield, gearbox, and silencers. | 11th Apr 1925 | Box 180 \ M3 \ M3.5 img015 | |
| The status and issues of various vehicle components. | 11th Apr 1925 | Box 180 \ M3 \ M3.5 img016 | |
| Hand-drawn sketch and typed description of a fabric coupling from the gearbox end. | 24th May 1934 | Box 180 \ M3 \ M3.5 img017 | |
| Twelve points on the mechanics and potential improvements for the 'V' Series steering. | 15th Apr 1925 | Box 180 \ M3 \ M3.5 img018 | |
| From 'R' discussing design modifications to strengthen a gearbox fabric coupling. | 1st Apr 1925 | Box 180 \ M3 \ M3.5 img019 | |
| Future car work, detailing requested studies for chassis improvements. | 15th Apr 1925 | Box 180 \ M3 \ M3.5 img020 | |
| Connecting rod bearing failure on a car during tests in France after 4,500 miles. | 1st Apr 1925 | Box 180 \ M3 \ M3.5 img021 | |
| Connecting rod bearing failure test on an E.A.C. engine. | 16th Apr 1925 | Box 180 \ M3 \ M3.5 img022 | |
| Broken steering column flange from 'V' series tests in France. | 17th Apr 1925 | Box 180 \ M3 \ M3.5 img023 | |
| 'V' Series engine tests in France, focusing on the condition of connecting rod bearings. | 8th Apr 1925 | Box 180 \ M3 \ M3.5 img024 | |
| The condition of a 4-EAG-11 engine from chassis 98-NK after 10,000 miles. | 25th Sep 1924 | Box 180 \ M3 \ M3.5 img025 | |
| The wear and condition of various engine components. | 25th Sep 1924 | Box 180 \ M3 \ M3.5 img026 | |
| The condition and wear of various engine components. | 25th Sep 1924 | Box 180 \ M3 \ M3.5 img027 | |
| Failures in induction, exhaust fittings, and an oil relay. | 25th Sep 1924 | Box 180 \ M3 \ M3.5 img028 | |
| The preparation of an 'EAC' 'V' series car with a Hooper open touring body. | 1st Apr 1925 | Box 180 \ M3 \ M3.5 img029 | |
| Secret memo discussing the relocation of the starter motor to the engine to overcome design limits. | 20th Apr 1925 | Box 180 \ M3 \ M3.5 img030 | |
| 10,000-mile road test of the 93-NK car. | 20th Apr 1925 | Box 180 \ M3 \ M3.5 img031 | |
| Chassis 93-NK after 5,447 miles, detailing engine and steering column issues. | 16th Apr 1925 | Box 180 \ M3 \ M3.5 img032 | |
| The condition of various vehicle components including the axle, clutch, and radiator. | 16th Apr 1925 | Box 180 \ M3 \ M3.5 img033 | |
| High-speed steering wobbles caused by low-pressure tyres on 40/50 HP cars. | 20th Apr 1925 | Box 180 \ M3 \ M3.5 img034 | |
| Continued memo discussing the delay in testing a scheme to solve steering wobble on 'Y' series vehicles. | 20th Apr 1925 | Box 180 \ M3 \ M3.5 img035 | |
| Irritating noises of various car horns, including the klaxon and the 'Boa Constrictor' bulb horn. | 20th Apr 1925 | Box 180 \ M3 \ M3.5 img036 | |
| Indicating work on 'V' series steering is held up, awaiting agreement and instructions for a roller bearing scheme and whitemetal nut. | 27th Apr 1925 | Box 180 \ M3 \ M3.5 img037 | |
| Problems with 40/50 and E.A.C. fabric couplings, proposing tests and considering alternative solutions. | 1st Apr 1925 | Box 180 \ M3 \ M3.5 img038 | |
| The mileage testing of an 'EAC' fabric coupling fitted to a 93-NK car. | 1st May 1925 | Box 180 \ M3 \ M3.5 img039 | |
| Advantages of implementing parallel axle control on the 45HP 'X' Series to make it more like the 20HP model. | 9th May 1925 | Box 180 \ M3 \ M3.5 img040 | |
| Vehicle components, referencing model EAC/-, with a postscript advising against a proposed track width increase for Colonial models. | 9th May 1931 | Box 180 \ M3 \ M3.5 img041 | |
| 10,000-mile test of a 'V' Series car in France, detailing a connecting rod failure. | 11th May 1925 | Box 180 \ M3 \ M3.5 img042 | |
| The failure of connecting rod bearings on the Glenk car. | 12th May 1925 | Box 180 \ M3 \ M3.5 img043 | |
| Proposing a modification to the E.A.C. clutch to improve its stopping action. | 12th May 1925 | Box 180 \ M3 \ M3.5 img044 | |
| The steering performance of a 20 HP Sunbeam car, noting issues with wobbles and wear. | 6th May 1925 | Box 180 \ M3 \ M3.5 img045 | |
| Secret memo proposing a visit to W.W. with an 'India' car to demonstrate improvements and discuss its trip to France. | 19th May 1925 | Box 180 \ M3 \ M3.5 img046 | |
| Clearance and design modifications for a new chassis, comparing it to the EAC and Silver Ghost types. | 29th May 1925 | Box 180 \ M3 \ M3.5 img047 | |
| Connecting rod failure from a 93-MK car. | 4th Jun 1925 | Box 180 \ M3 \ M3.5 img048 | |
| The durability of a fabric coupling after a 15,000-mile road test. | 24th Apr 1925 | Box 180 \ M3 \ M3.5 img049 | |
| Secret memorandum detailing modifications and urgent requirements for front brake adjustments. | 6th Oct 1925 | Box 180 \ M3 \ M3.5 img050 | |
| Modifications and trials for EAC & Goshawk connecting rods. | 12th Jun 1925 | Box 180 \ M3 \ M3.5 img051 | |
| From R. to H.S. regarding modifications to an EAC chassis to improve braking and safety. | 22th Jun 1925 | Box 180 \ M3 \ M3.5 img052 | |
| Ignition and brake issues, including sticking and vibration, on a New Phantom car. | 26th Jun 1925 | Box 180 \ M3 \ M3.5 img053 | |
| Requesting new carburetter parts and discussing ignition plug performance for a New Phantom model. | 30th Jun 1925 | Box 180 \ M3 \ M3.5 img054 | |
| Ignition failure and brake issues, including servo vibration, on a New Phantom car. | 26th Jun 1925 | Box 180 \ M3 \ M3.5 img055 | |
| Alterations to the 40/50 HP front shock dampers and front axle anchorage. | 5th May 1919 | Box 180 \ M3 \ M3.6 img001 | |
| Mr. Royce's criticism of the 40/50 HP clutch operation and a request for a redesign. | 18th May 1919 | Box 180 \ M3 \ M3.6 img002 | |
| Design and construction of 40/50 HP Radiator Shutters. | 13th May 1919 | Box 180 \ M3 \ M3.6 img003 | |
| Finish and fitting of radiator shutters, including alterations to the vent pipe. | 1st May 1919 | Box 180 \ M3 \ M3.6 img004 | |
| Correspondence regarding the colour choice for a new car body. | 14th May 1919 | Box 180 \ M3 \ M3.6 img005 | |
| Potential removal of the carburetter's hot water jacket due to suspected fuel boiling. | 20th May 1919 | Box 180 \ M3 \ M3.6 img006 | |
| Practicalities of constructing a square box section front axle. | 24th May 1919 | Box 180 \ M3 \ M3.6 img007 | |
| Methods for radiator screening and a water bye-pass system for temperature control. | 2nd Jun 1919 | Box 180 \ M3 \ M3.6 img008 | |
| The thermostat arrangement on a Packard car, including its operation and a sketch of the tube. | 2nd Jun 1919 | Box 180 \ M3 \ M3.6 img009 | |
| Schematic diagram of an engine cooling system featuring a thermostat and butterfly valves. | 1st May 1919 | Box 180 \ M3 \ M3.6 img010 | |
| Modifications to the front bonnet catch for easier operation. | 1st May 1919 | Box 180 \ M3 \ M3.6 img011 | |
| Requesting a pair of revised bonnet catches for trial, following Mr. Royce's wishes. | 1st May 1919 | Box 180 \ M3 \ M3.6 img012 | |
| Design modifications to the 40/50 HP chassis air pump, including the piston and cylinder cap. | 1st May 1919 | Box 180 \ M3 \ M3.6 img013 | |
| Page discussing whether to leave a cylinder with a solid crown. | 1st May 1919 | Box 180 \ M3 \ M3.6 img014 | |
| Temperature of floorboards and a proposal for standardised scuttle dash ventilators to keep them cool. | 6th Jun 1919 | Box 180 \ M3 \ M3.6 img015 | |
| Engine temperature control and the justification for fitting shutters to radiators. | 2nd Jun 1919 | Box 180 \ M3 \ M3.6 img016 | |
| Use of louvres, thermometers, and other means to control radiator water temperature. | 1st Jun 1919 | Box 180 \ M3 \ M3.6 img017 | |
| Value of air shutters and difficulties with the bonnet handles on various chassis models. | 4th Jun 1919 | Box 180 \ M3 \ M3.6 img018 | |
| Proposal to simplify and improve the priming system on the 40/50 HP chassis by modifying the induction pipe cock. | 6th Jun 1919 | Box 180 \ M3 \ M3.6 img019 | |
| Arguing for the adoption of aluminium pistons in repair engines, detailing their advantages over cast iron. | 1st Jun 1919 | Box 180 \ M3 \ M3.6 img020 | |
| Design change for front axle swivel pins from a parallel fit to a taper fit. | 9th Jun 1919 | Box 180 \ M3 \ M3.6 img021 | |
| Pros and cons of earthing electrical connections to the vehicle frame, comparing it to Buick and ship practices. | 9th Jun 1919 | Box 180 \ M3 \ M3.6 img022 | |
| Substitution of earth connections with a double wiring system, particularly for ship work. | 1st Jun 1919 | Box 180 \ M3 \ M3.6 img023 | |
| Use of different tyre sizes on the front and rear wheels for a 40/50 HP chassis. | 10th Jun 1919 | Box 180 \ M3 \ M3.6 img024 | |
| Changes to the electrical distributing board for 40/50 HP cars, including a switch to a single fuse system. | 18th Jun 1919 | Box 180 \ M3 \ M3.6 img025 | |
| Electrical circuit insulation and the effect of accidental earth contacts. | 1st Jun 1919 | Box 180 \ M3 \ M3.6 img026 | |
| From Mr. Royce giving feedback and direction on the design of rear shock dampers for the 40/50 HP chassis. | 18th Jun 1919 | Box 180 \ M3 \ M3.6 img027 | |
| Experiments with a new 40/50 HP trial chassis, focusing on the positioning of springs and shock absorbers. | 3rd Jul 1919 | Box 180 \ M3 \ M3.6 img028 | |
| Expansion of aluminium pistons and the potential for engine damage from a tight piston. | 8th Jul 1919 | Box 180 \ M3 \ M3.6 img029 | |
| Exchange of car 1X for 7 CA and gaining experience on the latter. | 7th Jul 1919 | Box 180 \ M3 \ M3.6 img030 | |
| Safety feature for the electric starter to prevent operation unless the gear lever is in neutral. | 1st Jul 1919 | Box 180 \ M3 \ M3.6 img031 | |
| Controlling engine water temperature, comparing a bye-pass system with a louvred system and mentioning primers. | 25th Jul 1919 | Box 180 \ M3 \ M3.6 img032 | |
| Proposal for fitting primers to existing 40/50 HP chassis to improve starting. | 1st Jul 1919 | Box 180 \ M3 \ M3.6 img033 | |
| The recurring failure of gauze petrol filters on the 40/50 chassis, suggesting regular replacement or a design change for better accessibility. | 22th Jul 1919 | Box 180 \ M3 \ M3.6 img034 | |
| Preliminary tests of new type shock absorbers, comparing the movement of new plates against original plates. | 23th Jul 1919 | Box 180 \ M3 \ M3.6 img035 | |
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