| Description | Date | Identifier | |
| The performance and condition of an E.A.C. engine after 148 hours of running. | 19th Oct 1923 | Box 72 \ 4 scan0321 | |
| Observations during a 32-hour endurance run, detailing issues with valves, valve springs, and oil leaks. | 12th Jul 1923 | Box 72 \ 4 scan0322 | |
| Engine component issues and potential improvements following an endurance test. | 19th Oct 1923 | Box 72 \ 4 scan0323 | |
| Pinion shaft assembly, oil consumption, and an exhaust manifold. | 19th Oct 1923 | Box 72 \ 4 scan0324 | |
| Wear on the oil pump, distributor drive, and a cracked main bearing. | 9th Oct 1923 | Box 72 \ 4 scan0325 | |
| The investigation of the E.A. C-1 Engine. | 4th Nov 1923 | Box 72 \ 4 scan0326 | |
| Comparing the thermal efficiencies and heat distribution of an E.A.C. engine against a standard 40/50 RR engine. | 14th Nov 1923 | Box 72 \ 4 scan0327 | |
| Heat distribution test data tables expressed as a percentage of heat supplied at various RPMs. | 14th Nov 1923 | Box 72 \ 4 scan0328 | |
| Test report on the heat distribution and thermal efficiency of an E.A.C-1 engine. | 14th Nov 1923 | Box 72 \ 4 scan0329 | |
| Comparison of efficiencies for STD. 40/50 RR. and E.A.C.1 engines with valve timing diagram. | 14th Nov 1923 | Box 72 \ 4 scan0330 | |
| Energy diagram for a 40-50 model with a compression ratio of 3.9, showing various efficiencies and losses against engine RPM. | 14th Nov 1923 | Box 72 \ 4 scan0331 | |
| Energy diagram and power output graphs for the E.A.C.1 engine, with comparison to the 40-50 R.R. engine. | 14th Nov 1923 | Box 72 \ 4 scan0332 | |
| Secret memorandum discussing EAC engine weight and power targets, with specific goals for weight reduction and increased horsepower. | 15th Feb 1924 | Box 72 \ 4 scan0333 | |
| The removal, weighing, and testing of a Hispano engine unit, with a comparison to an EAC engine. | 1st Feb 1924 | Box 72 \ 4 scan0334 | |
| Comparison of road wheel horsepower between a Hispano and an EAC low compression engine. | 20th Feb 1924 | Box 72 \ 4 scan0335 | |
| EAC engine test with two Claudel Carburetters, detailing performance data. | 20th Feb 1924 | Box 72 \ 4 scan0336 | |
| Power loss issues with the EAC engine's 6-cylinder exhaust manifold. | 1st May 1924 | Box 72 \ 4 scan0337 | |
| Table comparing engine Brake Horse Power (B.HP) across different carburettor and exhaust configurations at various R.P.M. | 28th Mar 1924 | Box 72 \ 4 scan0338 | |
| Losses in exhaust pipes. | 28th Mar 1924 | Box 72 \ 4 scan0339 | |
| Indicator work for EAC. 14 engines, focusing on carburetter and exhaust systems. | 28th Mar 1924 | Box 72 \ 4 scan0340 | |
| Comparing four different manifold systems and their effect on exhaust pressure and power output. | 28th Mar 1924 | Box 72 \ 4 scan0341 | |
| The requirements for early ignition in EAC engines, considering exhaust manifold design and pre-ignition. | 28th Mar 1924 | Box 72 \ 4 scan0342 | |
| Summary of light spring diagrams comparing four different exhaust manifold types for No. 1 cylinder. | 27th Mar 1924 | Box 72 \ 4 scan0343 | |
| Indicator diagrams and performance curves for an E.A.C. engine, comparing various exhaust manifold configurations. | 27th Mar 1924 | Box 72 \ 4 scan0344 | |
| The performance, losses, and adjustment of a flat disc type servo. | 14th Apr 1924 | Box 72 \ 4 scan0345 | |
| Friction and other losses in a slow speed servo mechanism. | 12th Jul 1923 | Box 72 \ 4 scan0346 | |
| Comparison of plate pressure on the DES.38 servo, detailing torque loss and differences in actuating thread angles. | 12th Jul 1923 | Box 72 \ 4 scan0347 | |
| Test results for frictional losses of a slow-speed servo motor. | 14th Aug 1924 | Box 72 \ 4 scan0348 | |
| From G. Ratcliffe to Mr. Hives detailing engine performance data with the cut-out closed. | 14th Aug 1924 | Box 72 \ 4 scan0349 | |
| Secret report detailing the performance of the EAC engine and outlining proposed improvements. | 29th Aug 1924 | Box 72 \ 4 scan0350 | |
| The slow running performance of the E.A.C. engine. | 26th Sep 1924 | Box 72 \ 4 scan0351 | |
| Diagram illustrating the battery and magneto ignition advance curves. | 30th May 1924 | Box 72 \ 4 scan0352 | |
| Seeking approval for new ignition timing instructions for the EAC.3 engine. | 11th Nov 1924 | Box 72 \ 4 scan0353 | |
| Instructions for setting the ignition timing on the EAC.3 engine, version 1. | 11th Nov 1924 | Box 72 \ 4 scan0354 | |
| Instructions for timing the magneto using the flywheel and distributor wheel markings. | 11th Nov 1924 | Box 72 \ 4 scan0355 | |
| Instructions for adjusting the platinum point gap on a magneto's contact breaker using a jig. | 5th Feb 1925 | Box 72 \ 4 scan0356 | |
| The instructions for the ignition timing of the EAC.3 engine. | 5th Feb 1925 | Box 72 \ 4 scan0357 | |
| Secret memorandum discussing steering and road shock issues related to steering pivots and front wheel brakes. | 26th Feb 1924 | Box 73 \ 1 scan0001 | |
| Potential causes and solutions for steering problems like shocks and wobbles. | 27th Feb 1924 | Box 73 \ 1 scan0002 | |
| Comparing steel artillery wheels against wire wheels and their effect on steering. | 27th Feb 1924 | Box 73 \ 1 scan0003 | |
| Secret memorandum discussing front axle design, wheel standardization, and steering with front wheel brakes. | 22th Mar 1924 | Box 73 \ 1 scan0004 | |
| Use of Sankey type steel artillery wheels for MAC.2, 3, and Goshawk models. | 26th May 1924 | Box 73 \ 1 scan0005 | |
| Modifications to steel artillery wheel fixings, including a novel self-adjusting washer system. | 16th Jul 1924 | Box 73 \ 1 scan0006 | |
| Modifications to steering artillery wheels and a patent for a slipping washer design. | 17th Jul 1924 | Box 73 \ 1 scan0007 | |
| New design for fitting steel artillery wheels on Dunlop hubs. | 18th Jul 1924 | Box 73 \ 1 scan0008 | |
| Procurement of test bodies for new car models, emphasizing a discreet method to avoid trade rumours. | 11th Jan 1928 | Box 73 \ 1 scan0009 | |
| Requesting updates on the design and manufacture of a speed touring body for 'Seagull' or 'Heron' models. | 18th Jan 1923 | Box 73 \ 1 scan0010 | |
| Design of bodies for the 40/50 chassis, experimental work, and blueprint requirements. | 24th Jan 1923 | Box 73 \ 1 scan0011 | |
| Recommendation regarding the fitting of E.A.C. bodies onto a standard 40/50 chassis and an experimental chassis. | 21th Feb 1923 | Box 73 \ 1 scan0012 | |
| Secret memorandum regarding modifications for Experimental chassis 5.EX for the 'E.A.C.' project. | 23th Feb 1923 | Box 73 \ 1 scan0013 | |
| Secret memo regarding the preparation of bodies for the E.A.C. engine project. | 11th Sep 1923 | Box 73 \ 1 scan0014 | |
| Construction of a disguised armoured body for the E.A.C. chassis to resemble a fully loaded car. | 1st Sep 1923 | Box 73 \ 1 scan0015 | |
| Requesting two 40/50 HP long type chassis for experimental front wheel brake tests. | 28th Sep 1923 | Box 73 \ 1 scan0016 | |
| Production sequence of fitting bodies and front wheel brakes. | 3rd Oct 1923 | Box 73 \ 1 scan0017 | |
| Confidential memo regarding arrangements for two dummy armoured car bodies for E.A.C. testing. | 3rd Oct 1923 | Box 73 \ 1 scan0018 | |
| Confidential memo discussing the procurement of bodies for 10,000-mile tests on 20 HP and 40/50 HP production chassis. | 4th Oct 1923 | Box 73 \ 1 scan0019 | |
| Secret memo discussing the design and sourcing of parts for an armoured car body. | 10th Oct 1923 | Box 73 \ 1 scan0020 | |
| Query regarding the potential to cover or obscure the front wheel brakes on an armoured car body. | 5th Oct 1923 | Box 73 \ 1 scan0021 | |
| Secret memo outlining modifications and a test plan for the experimental E.A.C-3 chassis, focusing on the implementation of 4-wheel brakes. | 5th Oct 1923 | Box 73 \ 1 scan0022 | |
| Logistics and requirements for experimental tests on six chassis, including timing, front wheel brakes, and body types. | 4th Oct 1923 | Box 73 \ 1 scan0023 | |
| Secret memo regarding the requirement for 6 car bodies for experimental E.A.C-3 chassis to be used as Trials Cars. | 1st Oct 1923 | Box 73 \ 1 scan0024 | |
| Proposing a trip to London to test a 4-G-11 car and arrange coachwork for E.A.C. C-3 chassis. | 8th Oct 1923 | Box 73 \ 1 scan0025 | |
| Despatching chassis to Barkers coachbuilders and specifying body types for testing. | 10th Oct 1923 | Box 73 \ 1 scan0026 | |
| Despatching chassis 35-PK and 93-NK for the fitting of heavy test bodies. | 11th Oct 1923 | Box 73 \ 1 scan0027 | |
| Sourcing of eight test bodies from various coachbuilders and the availability of others. | 13th Oct 1923 | Box 73 \ 1 scan0028 | |
| Instruction to Messrs. Sanderson & Holmes Ltd. to carry out work on chassis 9.PK. | 22th Feb 1924 | Box 73 \ 1 scan0029 | |
| 10,000-mile vehicle test conducted in France. | 22th May 1924 | Box 73 \ 1 scan0030 | |
| List of complaints and suggested improvements following a 10,000 miles road test in France. | 22th May 1924 | Box 73 \ 1 scan0031 | |
| Complaint about the hood mechanism, with a section for suggested improvements. | 24th May 1924 | Box 73 \ 1 scan0032 | |
| 1000-mile test cars, suggesting coachbuilder involvement to identify weaknesses in body construction and proposing wing stay design improvements. | 24th May 1924 | Box 73 \ 1 scan0033 | |
| Condition of test car 98-NK and a proposal for its repair by Messrs. Barkers. | 27th May 1924 | Box 73 \ 1 scan0034 | |
| Bodywork failures on 10,000-mile test car 98-NK, related to mounting by coachbuilders Messrs. Barkers. | 4th Jun 1924 | Box 73 \ 1 scan0035 | |
| Failures on a Barker body fitted to a 10,000-mile test car and arranging for them to view the repairs. | 5th Jun 1924 | Box 73 \ 1 scan0036 | |
| Arranging new lead-coloured wings and bodywork for a Barker Torpedo, chassis 98-NK. | 6th Jun 1924 | Box 73 \ 1 scan0037 | |
| Confidential memo concerning a faulty Barker Open Touring body on an experimental chassis and arranging for an inspection. | 13th Jun 1924 | Box 73 \ 1 scan0038 | |
| Enquiring if Barkers examined car 98-NK before it went away. | 28th Jun 1924 | Box 73 \ 1 scan0039 | |
| Authorizing work on car 9-PK by Messrs. Sanderson & Holmes. | 24th Jul 1924 | Box 73 \ 1 scan0040 | |
| Two designs for an open Sports Touring Car, a boat body and a phaeton, requested by Mr. Hives. | 1st Aug 1924 | Box 73 \ 1 scan0041 | |
| Secret memorandum discussing the design and sourcing of bodies for experimental cars. | 29th Aug 1924 | Box 73 \ 1 scan0042 | |
| Secret memo discussing options for obtaining bodies for the experimental EAC.2 chassis from coachbuilders. | 1st Sep 1924 | Box 73 \ 1 scan0043 | |
| Different suggestions for vehicle body manufacturing and finishing, concluding with an arrangement to use Barkers. | 16th Sep 1924 | Box 73 \ 1 scan0044 | |
| Alteration of a Hooper open touring body on an experimental car. | 16th Sep 1924 | Box 73 \ 1 scan0045 | |
| Secret memo requesting two up-to-date E.A.C. engine cars with different body types for testing. | 17th Sep 1924 | Box 73 \ 1 scan0046 | |
| Secret memo discussing the availability of up-to-date EAC cars for Sales trials. | 18th Sep 1924 | Box 73 \ 1 scan0047 | |
| Windscreen failures experienced during a 10,000-mile test in France. | 23th Sep 1924 | Box 73 \ 1 scan0048 | |
| Modification to a windscreen panel on vehicle 9-PK to prevent glass distortion. | 13th Oct 1924 | Box 73 \ 1 scan0049 | |
| Secret memorandum discussing body specifications for a 40/50 chassis, including steering options, wings, and the potential use of an American body. | 13th Oct 1924 | Box 73 \ 1 scan0050 | |
| Instruction to Messrs. Sanderson & Holmes Ltd. to carry out work on a chassis as per an attached estimate. | 24th Oct 1924 | Box 73 \ 1 scan0051 | |
| Dispatch of a Dummy 40/50 HP chassis with a special Open Touring Body. | 20th Mar 1925 | Box 73 \ 1 scan0052 | |
| From Hs. to DA/EV regarding the delay of car 9-PK due to urgent work on the 'V' series. | 23th Mar 1925 | Box 73 \ 1 scan0053 | |
| Delay with chassis 9.P.K. and a suggestion for a workaround. | 25th Mar 1925 | Box 73 \ 1 scan0054 | |
| Delivery of the 9-PK car and a warning against its use as a demonstrator. | 1st Jun 1925 | Box 73 \ 1 scan0055 | |
| Need to swap a car body for a chassis test and ordering a new cabriolet body for a 20 HP car. | 1st Jun 1925 | Box 73 \ 1 scan0056 | |
| Return of a dummy 40/50 car chassis to Messrs. Barkers. | 15th Jun 1925 | Box 73 \ 1 scan0057 | |
| Sending a dummy car with a sports body back to coachbuilder Messrs. Barkers. | 15th Jun 1925 | Box 73 \ 1 scan0058 | |
| Instruction memo to Messrs. Sanderson & Holmes Ltd. to carry out work on car 9-PK as per an attached estimate. | 22th Jun 1925 | Box 73 \ 1 scan0059 | |
| Body options and alterations for chassis EAC.1, specifically concerning dash width. | 30th Nov 1925 | Box 73 \ 1 scan0060 | |
| Secret memorandum concerning the mounting of a subframe body for a New Phantom chassis onto an E.A.C.I. body. | 30th Nov 1925 | Box 73 \ 1 scan0061 | |
| Letter to Barker & Co Ltd regarding the completion of cabriolet body No. L.6414 on a subframe without a chassis. | 5th Dec 1925 | Box 73 \ 1 scan0062 | |
| Instruction memo for Messrs. Sanderson & Holmes Ltd. to perform work on a car based on an attached estimate. | 25th Jan 1926 | Box 73 \ 1 scan0063 | |
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