| Description | Date | Identifier | |
| Test results for the breakdown voltage and conductance of various ignition coil insulating papers. | 5th Oct 1930 | Box 69 \ 2 scan0025 | |
| Discussion comparing the properties of different insulating papers for wax impregnation in coils. | 15th Oct 1930 | Box 69 \ 2 scan0026 | |
| Adjusting the distributor and sparking plug gaps for the 20/25 HP ignition system. | 4th Nov 1930 | Box 69 \ 2 scan0027 | |
| Experiments with the 20/25 ignition system, focusing on spark behavior within the distributor. | 9th Nov 1930 | Box 69 \ 2 scan0028 | |
| 20/25 ignition system tests, detailing misfiring issues due to insufficient coil voltage and plans for a new coil. | 1st Dec 1930 | Box 69 \ 2 scan0029 | |
| Extract from a 6,000-mile report on vehicle 18-GIV, specifically regarding the coil. | 18th Dec 1930 | Box 69 \ 2 scan0030 | |
| The examination of a coil, condenser, and ballast from chassis GLN.15, with follow-up questions. | 23th Dec 1930 | Box 69 \ 2 scan0031 | |
| Letter to Lucas Electrical Co. Ltd. seeking advice on production testing methods for ignition coils. | 30th Dec 1930 | Box 69 \ 2 scan0032 | |
| Alteration to the production test for ignition coil D.72503. | 31th Dec 1930 | Box 69 \ 2 scan0033 | |
| High failure rate of the Delco Remy Ignition Coil across various models. | 31th Dec 1930 | Box 69 \ 2 scan0034 | |
| Cross-reference note for information relating to an ignition coil design with paxolin tubes. | 31th Dec 1930 | Box 69 \ 2 scan0035 | |
| Secret memo detailing modifications for fitting an engine into a chassis, including changes to the front springs, frame, and radiator. | 19th Oct 1923 | Box 69 \ 2 scan0036 | |
| Modifications to the radiator dimensions and the stiffness of front springs. | 19th Oct 1923 | Box 69 \ 2 scan0037 | |
| Proposed modifications for the E.A.C.2 model, including dashboard layout, vacuum system, and ignition wiring. | 19th Oct 1923 | Box 69 \ 2 scan0038 | |
| Instructions on the proposed dynamo and the location of a changeover switch for specific models. | 19th Oct 1923 | Box 69 \ 2 scan0039 | |
| Private memorandum regarding the road testing of a new engine (E.A.C.II) in a standard chassis to maintain secrecy. | 1st Dec 1923 | Box 69 \ 2 scan0040 | |
| Fitting an original EAC engine to a standard 40/50 HP chassis for road testing. | 10th Dec 1923 | Box 69 \ 2 scan0041 | |
| Proposed modifications and future plans for the E.A.C.II and E.A.C.III chassis. | 1st Dec 1923 | Box 69 \ 2 scan0042 | |
| Private memo regarding the E.A.C.II engine, discussing that the radiator and bonnet are 1 inch higher than originally stated. | 12th Nov 1923 | Box 69 \ 2 scan0043 | |
| Missing luggage grid, stiff steering issues, and improving brakes for a car. | 12th Jan 1924 | Box 69 \ 2 scan0044 | |
| The performance and modifications of the PN's Trials' Car 46-PK. | 12th Jul 1923 | Box 69 \ 2 scan0045 | |
| Modifications and performance of an engine, carburetter, clutch, and chassis components. | 12th Jul 1923 | Box 69 \ 2 scan0046 | |
| Car's performance, detailing steering, suspension, weight, and on-road testing of the engine, exhaust, and speedometer. | 12th Jul 1923 | Box 69 \ 2 scan0047 | |
| Test vehicle's vibration, braking noise, clutch, steering, and potential overheating issues. | 12th Jul 1923 | Box 69 \ 2 scan0048 | |
| Issues with brake consistency and the difficulty of equalising four-wheel brakes. | 12th Jul 1923 | Box 69 \ 2 scan0049 | |
| Arguing the advantages of perfecting the EAC.11 design over developing the new EAC.1V. | 13th Feb 1924 | Box 69 \ 2 scan0050 | |
| Comparative analysis table of two different vehicle configurations, EAC.11 and EAC.1V. | 1st Feb 1924 | Box 69 \ 2 scan0051 | |
| Strategic letter discussing the launch timing and market impact of the EAC.II and EAC.IV models. | 1st Feb 1924 | Box 69 \ 2 scan0052 | |
| Letter from C.J. discussing the negative business ramifications of introducing new car models EAC.II and EAC.IV. | 14th Feb 1924 | Box 69 \ 2 scan0053 | |
| Troubles found with the EAC.11 chassis before delivery to customers. | 28th Feb 1924 | Box 69 \ 2 scan0054 | |
| Outstanding work required to complete the EAC.11 car. | 28th Feb 1924 | Box 69 \ 2 scan0055 | |
| Secret internal memorandum discussing a series of potential engineering improvements for an engine and chassis. | 10th Mar 1924 | Box 69 \ 2 scan0056 | |
| Improvements for noise reduction, clutch, and brake operation, and urging timely completion. | 3rd Apr 1924 | Box 69 \ 2 scan0057 | |
| Preparation of car EAC.11, and arrangements for a temporary car if delivery is delayed. | 3rd Apr 1924 | Box 69 \ 2 scan0058 | |
| Arrangements for a trial of a car fitted with an EAC engine, including body style options. | 3rd May 1924 | Box 69 \ 2 scan0059 | |
| Strict security protocols for handling the bonnet key of Car No. 46PK. | 5th May 1924 | Box 69 \ 2 scan0060 | |
| Secret memo from B.J. to Hs. regarding the fitting of a closed cabriolet body to a car with an E.A.C. engine. | 6th May 1924 | Box 69 \ 2 scan0061 | |
| Modifications to the EAC test car before it is ready. | 8th May 1924 | Box 69 \ 2 scan0062 | |
| Secret memo from Hs. to CJ. and BJ. regarding the garaging and inspection of two cars with EAC engines. | 9th May 1924 | Box 69 \ 2 scan0063 | |
| Advantages of a new servo-assisted braking scheme over the Hispano system. | 9th May 1924 | Box 69 \ 2 scan0064 | |
| Report comparing a RR chassis with a Hispano, detailing brake, clutch, carburetter, and exhaust test results and modifications. | 9th May 1924 | Box 69 \ 2 scan0065 | |
| Secret memo discussing plans to test a car with an E.A.C. engine and an open body. | 9th May 1924 | Box 69 \ 2 scan0066 | |
| Inquiring if an E.A.C. car for trial will be fitted with the newly approved front wheel brakes. | 12th May 1924 | Box 69 \ 2 scan0067 | |
| Secret memo discussing the fitting and testing of a new brake scheme and steering lock on an EAC car. | 5th May 1924 | Box 69 \ 2 scan0068 | |
| Secret internal memo about delaying a car test and arranging to test the brakes of another car. | 14th May 1924 | Box 69 \ 2 scan0069 | |
| The brake performance of an experimental car, noting issues with balance, servo judder, and pulling. | 19th May 1924 | Box 69 \ 2 scan0070 | |
| Record of experimental items fitted to vehicle 98NK. | 19th May 1924 | Box 69 \ 2 scan0071 | |
| Brake performance, specifically vibrations and the car's tendency to deviate upon braking. | 20th May 1924 | Box 69 \ 2 scan0072 | |
| Continued discussion on braking effects, comparing an equalised system with the Hispano braking system. | 20th May 1924 | Box 69 \ 2 scan0073 | |
| Modifications to the vehicle frame, including widening the rear track and adjusting the tie-rod arrangement. | 20th May 1924 | Box 69 \ 2 scan0074 | |
| The allocation and modification of several specific cars. | 3rd Jun 1924 | Box 69 \ 2 scan0075 | |
| Specifications and progress for a Speed Model vehicle. | 4th Jun 1924 | Box 69 \ 2 scan0076 | |
| Progress report on alterations and modifications to an engine and other vehicle components. | 5th Jun 1924 | Box 69 \ 2 scan0077 | |
| From BJ to Hs requesting an E.A.C. car with front wheel brakes be ready for collection from Derby. | 5th Jun 1924 | Box 69 \ 2 scan0078 | |
| Secret memo regarding arrangements for the E.A.C. car to be collected from Derby, noting it has the final brake scheme but may lack other modifications. | 6th Jun 1924 | Box 69 \ 2 scan0079 | |
| Telegram received by telephone from Basil Johnson regarding Hives trying a car. | 11th Jun 1924 | Box 69 \ 2 scan0080 | |
| Preference for an E.A.C. with front wheel brakes and a telegram regarding its trial. | 11th Jun 1924 | Box 69 \ 2 scan0081 | |
| Secret memorandum arranging the discreet testing of a car with an E.A.C. engine and experimental front wheel brakes. | 18th Jun 1924 | Box 69 \ 2 scan0082 | |
| Ongoing difficulties with noisy servo operating gears and the scheduling of repairs. | 19th Jun 1924 | Box 69 \ 2 scan0083 | |
| From Hs. to BJ. stating that the E.A.C. car will not be ready due to issues with noisy servo gears. | 25th Jun 1924 | Box 69 \ 2 scan0084 | |
| Arrangements for borrowing a car for a weekend trip to West Wittering and an air function in Southampton. | 20th Jun 1924 | Box 69 \ 2 scan0085 | |
| Raising questions about the delivery, specifications, and brake safety of an E.A.C. car for testing. | 1st Jul 1924 | Box 69 \ 2 scan0086 | |
| Secret memo forwarding an instruction to build six experimental chassis instead of one for testing purposes. | 27th Jun 1924 | Box 69 \ 2 scan0087 | |
| Secret memo outlining a proposal to send an open EAC.11 car to London for testing and to exchange it for other vehicles. | 1st Jul 1924 | Box 69 \ 2 scan0088 | |
| Arranging a secret trial for the E.A.C.II car, emphasizing the need for secrecy and specific delivery arrangements to Gerrards Cross. | 2nd Jul 1924 | Box 69 \ 2 scan0089 | |
| Arrangements for keeping an EAC open car in London and its subsequent delivery. | 3rd Jul 1924 | Box 69 \ 2 scan0090 | |
| Secret memo arranging the delivery and subsequent transfer of an open E.A.C. car. | 3rd Jul 1924 | Box 69 \ 2 scan0091 | |
| Performance report for an Open Touring Car, chassis number 46PK. | 4th Jul 1924 | Box 69 \ 2 scan0092 | |
| Comparison of the 46-PK model with the final EAC regarding expected improvements in engine performance and refinement. | 4th Jul 1924 | Box 69 \ 2 scan0093 | |
| The specifications and temporary features of a car under development, detailing components like gear ratio, controls, and brakes. | 4th Jul 1924 | Box 69 \ 2 scan0094 | |
| Comparison of gear ratios and performance between a test car and the standard 40/50 HP model. | 5th Jul 1924 | Box 69 \ 2 scan0095 | |
| Test drive report for an Open Touring Car, detailing performance issues and remarks. | 5th Jul 1924 | Box 69 \ 2 scan0096 | |
| Vehicle test report noting driver, mileage, petrol consumption, and performance remarks. | 6th Jul 1924 | Box 69 \ 2 scan0097 | |
| Typed secret memo from B.J. to Hs. confirming the availability of a car after testing. | 8th Jul 1924 | Box 69 \ 2 scan0098 | |
| Secret memo regarding arrangements to collect an open EAC car for testing and a request for accommodation. | 7th Jul 1924 | Box 69 \ 2 scan0099 | |
| Secret memo from 'Hs' to 'R' advising of an arrival time and the two vehicles being brought. | 8th Jul 1924 | Box 69 \ 2 scan0100 | |
| Secret internal memo arranging a meeting to inspect the EAC.11 car. | 8th Jul 1924 | Box 69 \ 2 scan0101 | |
| Secret memo from Hs to BJ arranging a meeting to discuss impressions of car EAC.11. | 24th Jul 1924 | Box 69 \ 2 scan0102 | |
| Typed letter to Mr. Bagley arranging to take the 46-PK car to the Bridge House Hotel for a meeting. | 8th Jul 1924 | Box 69 \ 2 scan0103 | |
| Secret memo from Hs to BJ about meeting to inspect car EAC.11, with handwritten notes on spring fitting. | 8th Jul 1924 | Box 69 \ 2 scan0104 | |
| Covering note regarding replies for outstanding items on a chassis. | 11th Jul 1924 | Box 69 \ 2 scan0105 | |
| Responding to queries about the Autovac, radiator shutter, undershield, and electrical system. | 8th Jul 1924 | Box 69 \ 2 scan0106 | |
| Secret memo detailing progress on designs for a petrol tank, battery placement, and other components. | 7th Jul 1924 | Box 69 \ 2 scan0107 | |
| Wiring, controls, and instrument board fittings for experimental cars. | 11th Jul 1938 | Box 69 \ 2 scan0108 | |
| Instructions on the positioning of the starting carburetter control and special instrument board for six cars. | 11th Jul 1938 | Box 69 \ 2 scan0109 | |
| Criticism and analysis of a car's springing and suspension system. | 12th Jul 1924 | Box 69 \ 2 scan0110 | |
| Continued report on suspension complaints and performance feedback for car 46-PK's engine and brakes. | 14th Jul 1924 | Box 69 \ 2 scan0111 | |
| Two different classes of sports touring car bodies for a short EAC.2 chassis. | 14th Jul 1924 | Box 69 \ 2 scan0112 | |
| Performance of pistons and connecting rods in an E.A.C. engine. | 15th Jul 1924 | Box 69 \ 2 scan0113 | |
| Brief memo from B.J. to Hs. forwarding an attached report concerning E.A.C.II. | 15th Jul 1924 | Box 69 \ 2 scan0114 | |
| Typed internal memo summarizing the road test results for car No. 46-PK. | 11th Jul 1924 | Box 69 \ 2 scan0115 | |
| From B.J. to R. detailing criticisms of the steering lock and control fittings on a steering wheel. | 11th Jul 1924 | Box 69 \ 2 scan0116 | |
| Drawings and design modifications for the engine and gearbox undershield. | 17th Jul 1924 | Box 69 \ 2 scan0117 | |
| Seating configuration of a new Sports Touring Car and a related mock-up. | 18th Jul 1924 | Box 69 \ 2 scan0118 | |
| Report relaying feedback on engine smoothness and silence, noting it was not quiet enough when the car was stationary. | 18th Jul 1924 | Box 69 \ 2 scan0119 | |
| Inconclusive road tests comparing the springing and ride comfort of two different chassis models. | 22th Jul 1924 | Box 69 \ 2 scan0120 | |
| Road test results regarding shock absorbers, springing, steering, and braking systems. | 22th Jul 1924 | Box 69 \ 2 scan0121 | |
| Testing of springing and front-wheel brakes on closed cars. | 23th Jul 1924 | Box 69 \ 2 scan0122 | |
| Test drive report on chassis 93-NK, noting improved brakes but also engine detonation and overly stiff steering. | 23th Jul 1924 | Box 69 \ 2 scan0123 | |
| Blueprints for revised car proportions and suggestions for body styles, including a boat body and a four-seater open tourer. | 25th Jul 1924 | Box 69 \ 2 scan0124 | |
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