| Description | Date | Identifier | |
| Technical improvements for the E.A.C. engine regarding compression, smoking, ignition and the starting handle. | 9th Feb 1924 | Box 72 \ 4 scan0121 | |
| Security protocol for handing over keys to chassis fitted with EAC engines. | 2nd Feb 1924 | Box 72 \ 4 scan0122 | |
| Secret memo regarding a receipt from a mechanic and an update on a car with an EAC engine in the Experimental Department. | 13th Feb 1924 | Box 72 \ 4 scan0123 | |
| Secret memo about the EAC engine's weight and power, outlining targets for weight reduction and performance enhancements. | 15th Feb 1924 | Box 72 \ 4 scan0124 | |
| Secret memo providing design feedback on Mr. Stent's servo drawing for the EAC.4 gearbox. | 1st Feb 1924 | Box 72 \ 4 scan0125 | |
| Continued discussion on lever design, weight reduction with aluminium, and alignment improvements. | 1st Feb 1924 | Box 72 \ 4 scan0126 | |
| Investigations into retard vibrations in the EAC engine and the effect of modifying the driveshaft. | 1st Feb 1924 | Box 72 \ 4 scan0127 | |
| Explaining a delay in sending out new designs for front springs and axles due to a priority shift between projects. | 19th Feb 1924 | Box 72 \ 4 scan0128 | |
| Secret memorandum detailing a visit to discuss designs for the EAC.3 slow speed servo, brake gear, and hand starting shaft. | 21th Feb 1924 | Box 72 \ 4 scan0129 | |
| Telegram detailing a compromise to postpone production of E.A.C. four and modify the starter motor location on E.A.C. two. | 22th Feb 1924 | Box 72 \ 4 scan0130 | |
| Secret memorandum discussing three troubles: Hispano brake patents, steering shocks, and a heated dynamo. | 23th Feb 1924 | Box 72 \ 4 scan0131 | |
| Suggesting improvements for the front brakes on the 40/50 HP car. | 23th Feb 1924 | Box 72 \ 4 scan0132 | |
| Recommendations for braking and steering components. | 23th Feb 1924 | Box 72 \ 4 scan0133 | |
| Comparing detonation in Hispano and EAC engines. | 1st Feb 1924 | Box 72 \ 4 scan0134 | |
| Telegram from Marseille regarding the postponement of production and the relocation of a starter motor. | 22th Feb 1924 | Box 72 \ 4 scan0135 | |
| Production of model ERC.II and proposed modifications to the starter motor and gearbox. | 29th Feb 1924 | Box 72 \ 4 scan0136 | |
| Secret memo discussing production strategy, advocating to bypass the EAC.4 model in favour of the EAC.5. | 29th Feb 1924 | Box 72 \ 4 scan0137 | |
| Secret internal memorandum regarding EAC.II and IV, agreeing to Mr. Royce's earlier memorandum. | 1st Mar 1924 | Box 72 \ 4 scan0138 | |
| Production programme for 'T' Series and EAC.II chassis, including brake fitting and delivery schedules. | 1st Mar 1924 | Box 72 \ 4 scan0139 | |
| From CJ to Wor. regarding a production gap and authorizing material for 50 Series 'U' EAC.III chassis. | 1st Mar 1924 | Box 72 \ 4 scan0140 | |
| Secret memo discussing whether to send E.A.C. engine test reports to Springfield. | 1st Mar 1924 | Box 72 \ 4 scan0141 | |
| Secret memo from Hs. to CJ. regarding the distribution of E.A.C. engine test reports to Springfield. | 11th Mar 1924 | Box 72 \ 4 scan0142 | |
| Test bench run to obtain data on a Hispano engine. | 11th Mar 1924 | Box 72 \ 4 scan0143 | |
| Comparing the specifications and power output of Hispano and E.A.C. engines. | 11th Mar 1924 | Box 72 \ 4 scan0144 | |
| Distribution and the effects of dual ignition on a Hispano engine. | 11th Mar 1924 | Box 72 \ 4 scan0145 | |
| Indicator work and efficiency tests carried out on a Hispano engine. | 2nd Mar 1924 | Box 72 \ 4 scan0146 | |
| Continued memorandum discussing indicator valve positioning, detonation, and volumetric efficiency. | 12th Mar 1924 | Box 72 \ 4 scan0147 | |
| Hispano indicator diagrams taken at 1500 and 2500 RPM. | 12th Mar 1924 | Box 72 \ 4 scan0148 | |
| Indicator diagram for a Hispano engine cylinder, plotting pressure against piston displacement for various crank angles. | 12th Mar 1924 | Box 72 \ 4 scan0149 | |
| Performance indicator diagram for a Hispano engine, plotting piston displacement against crank angles. | 12th Mar 1924 | Box 72 \ 4 scan0150 | |
| Graph comparing Brake Mean Effective Pressure (B.M.E.P.) against gas velocity past the valves for Hispano and E.A.C./R.R.C.H. carburettor configurations. | 12th Mar 1924 | Box 72 \ 4 scan0151 | |
| Graph comparing the specific output in BHP/Litre versus RPM for E.A.C. and Hispano engines. | 12th Mar 1924 | Box 72 \ 4 scan0152 | |
| Graph of ignition advance versus engine RPM for E.A.C. and Hispano engines, illustrating the effect of dual ignition. | 12th Mar 1924 | Box 72 \ 4 scan0153 | |
| Graph showing performance curves for a Hispano engine with its specifications. | 12th Mar 1924 | Box 72 \ 4 scan0154 | |
| Graph comparing inlet valve displacement against piston displacement for 'Hispano' and 'E.A.C.' models. | 12th Mar 1924 | Box 72 \ 4 scan0155 | |
| Performance graph showing B.HP, B.M.E.P., thermal efficiency, and fuel consumption against R.P.M., with a valve timing diagram. | 12th Mar 1924 | Box 72 \ 4 scan0156 | |
| Performance curves (HP & M.E.P.) comparing Hispano and E.A.C. engines. | 12th Mar 1924 | Box 72 \ 4 scan0157 | |
| Graph comparing E.A.C. and Hispano inlet valve lift diagrams against crankshaft degrees. | 12th Mar 1924 | Box 72 \ 4 scan0158 | |
| Valve timing diagrams and displacement curves for a Hispano-Suiza engine. | 10th Mar 1924 | Box 72 \ 4 scan0159 | |
| Performance graphs and valve timing diagram for a Hispano engine. | 10th Mar 1924 | Box 72 \ 4 scan0160 | |
| Modifications and fitting for a servo shaft and worm wheel. | 19th Mar 1924 | Box 72 \ 4 scan0161 | |
| Secret memo discussing the importance of secrecy for a new chassis and special speed model, including key management and the potential financial impact of rumors. | 20th Mar 1924 | Box 72 \ 4 scan0162 | |
| Secret memo regarding security protocols for garaging cars and preventing inspection of engine contents. | 24th Mar 1924 | Box 72 \ 4 scan0163 | |
| Secret internal memo discussing design considerations for a vehicle's frame, brakes, axle, and suspension. | 22th Mar 1924 | Box 72 \ 4 scan0164 | |
| Secret meeting memo discussing engine components including cams, carburetter, exhaust and detonations. | 22th Mar 1924 | Box 72 \ 4 scan0165 | |
| Secrecy procedures for experimental EAC engines, focusing on bonnet key management. | 27th Mar 1924 | Box 72 \ 4 scan0166 | |
| Car fitted with an EAC engine and a super 40/50 HP model seen in France. | 27th Mar 1924 | Box 72 \ 4 scan0167 | |
| Strict conditions and secrecy surrounding the key for a car's bonnet. | 29th Mar 1924 | Box 72 \ 4 scan0168 | |
| Project plan for vehicle EAC.V, suggesting the cancellation of EAC.1 and the reuse of its parts. | 29th Mar 1924 | Box 72 \ 4 scan0169 | |
| Important modifications to be urged forward for the 40/50 and 20HP chassis. | 3rd Apr 1924 | Box 72 \ 4 scan0170 | |
| The standardisation of a Vacuum Feed. | 10th Apr 1924 | Box 72 \ 4 scan0171 | |
| Engine ignition advance, combustion chamber shape, and second ignition plug positioning. | 10th Apr 1924 | Box 72 \ 4 scan0172 | |
| Secret memorandum about the design of front wheel brakes for short type EAC.111 chassis. | 11th Apr 1924 | Box 72 \ 4 scan0173 | |
| List of experiments and questions requiring a report, relating to engine modifications and other vehicle components. | 17th Apr 1924 | Box 72 \ 4 scan0174 | |
| List of questions and required reports regarding springs, steering, brakes, and oil leaks on a vehicle. | 28th Apr 1924 | Box 72 \ 4 scan0175 | |
| Delaying the issue of details and tools for 200 sets of a Servo Mechanism. | 28th Apr 1924 | Box 72 \ 4 scan0176 | |
| Shortcomings of Hispano brakes, a proposed new ratchet drive design, and engine issues. | 28th Apr 1924 | Box 72 \ 4 scan0177 | |
| Modifications to a car's dashboard, bonnet, and radiator to comply with instructions for experimental road use. | 1st May 1924 | Box 72 \ 4 scan0178 | |
| Development and suggested improvements for the EAC Engine X.9770. | 11th May 1924 | Box 72 \ 4 scan0179 | |
| Servo troubles, unequal braking, and proposed design improvements for the braking system. | 1st May 1924 | Box 72 \ 4 scan0180 | |
| Comparison of two direct braking schemes, one for the rear axle only and one for four wheels. | 1st May 1924 | Box 72 \ 4 scan0181 | |
| Secret internal memo regarding modifications to a car's braking system and levers. | 2nd May 1924 | Box 72 \ 4 scan0182 | |
| Record of experimental electrical parts fitted to chassis 46-PK. | 3rd May 1924 | Box 72 \ 4 scan0183 | |
| Record of electrical experimental parts fitted to chassis 93-NK. | 3rd May 1924 | Box 72 \ 4 scan0184 | |
| Strict security protocol for the handling and custody of a special car's bonnet key. | 20th Mar 1924 | Box 72 \ 4 scan0185 | |
| Test report on a car with an adopted braking scheme, covering pedal pressure, servo, safety, and steering. | 5th Jun 1924 | Box 72 \ 4 scan0186 | |
| Test report evaluating the performance of a car's clutch, brakes (jaggers), and servo system. | 28th Aug 1936 | Box 72 \ 4 scan0187 | |
| Post Office Telegram from Basil Johnson regarding a car trial for Mr. Hives. | 28th Aug 1936 | Box 72 \ 4 scan0188 | |
| Secret memo outlining the conditions for road testing the E.A.C.1 armoured car. | 18th Jun 1924 | Box 72 \ 4 scan0189 | |
| Letter received from an agent in Italy regarding news being spread. | 1st Jul 1924 | Box 72 \ 4 scan0190 | |
| Letter from Nicholls Brothers about a customer's request to substitute chassis 16-LM for the new 40/50 model. | 1st Jul 1924 | Box 72 \ 4 scan0191 | |
| Requesting to trace the origin of rumours about test cars in France and to restrict testing to country districts. | 1st Jul 1924 | Box 72 \ 4 scan0192 | |
| Translated letter from a client wishing to place five orders for a new car model being tested. | 28th Jun 1924 | Box 72 \ 4 scan0193 | |
| Secret internal memo concerning a 'Super Rolls-Royce' and other test vehicles. | 2nd Jul 1924 | Box 72 \ 4 scan0194 | |
| Letter clarifying the source of information obtained by Mr. Ubertalli was from an Englishman, not Lauro. | 2nd Jul 1924 | Box 72 \ 4 scan0195 | |
| Secret memo discussing the risk of a former employee, Lauro, sharing confidential information with a competitor, Isotta Fraschini. | 4th Jul 1924 | Box 72 \ 4 scan0196 | |
| Letter regarding an insurance ticket for car 35 PK and legal proceedings for an accident involving car 98 NK. | 7th Jul 1924 | Box 72 \ 4 scan0197 | |
| Suggesting the engine from chassis 98-NK be allocated to the sales department for demonstration work due to its pleasant performance. | 23th Jul 1924 | Box 72 \ 4 scan0198 | |
| Stringent security protocols and logging requirements for the key to a car's bonnet. | 1st Jul 1924 | Box 72 \ 4 scan0199 | |
| Preparation of a car with four-wheel brakes and an EAC.2 chassis for sales approval. | 14th Aug 1924 | Box 72 \ 4 scan0200 | |
| Test drive report on an E.A.C. Open Touring Car, detailing its performance and issues. | 22th Aug 1924 | Box 72 \ 4 scan0201 | |
| Evaluating the performance of the EAC engine, discussing issues and proposed improvements. | 29th Aug 1924 | Box 72 \ 4 scan0202 | |
| Repair and return of a 48-PK car and the unavailability of new type steering wheels. | 3rd Sep 1924 | Box 72 \ 4 scan0203 | |
| Required repairs and additions for a 48-PK Cabriolet. | 4th Sep 1924 | Box 72 \ 4 scan0204 | |
| Defending the department against claims of wasting time and money by detailing tests on cars with stronger springs. | 5th Sep 1924 | Box 72 \ 4 scan0205 | |
| The selection of car springs, balancing performance against comfort. | 5th Sep 1924 | Box 72 \ 4 scan0206 | |
| The repair and subsequent sale of the experimental 35-PK car after it was crashed in France. | 1st Sep 1924 | Box 72 \ 4 scan0207 | |
| Delay for a 48-PK Cabriolet due to alterations to the front springs. | 18th Sep 1924 | Box 72 \ 4 scan0208 | |
| Superior qualities of a specific car chassis and a proposal to reserve it for demonstration and testing. | 18th Sep 1924 | Box 72 \ 4 scan0209 | |
| Note confirming that a car will be for sale after being repaired and that the Repair Department will be contacted. | 19th Sep 1924 | Box 72 \ 4 scan0210 | |
| Delivery note for one 50/50 old Limousine, registration UF. 853. | 25th Sep 1924 | Box 72 \ 4 scan0211 | |
| Of goods forwarded for a 40/50 R.R. chassis fitted with a Hooper limousine body and accessories. | 25th Sep 1924 | Box 72 \ 4 scan0212 | |
| Engine inspection report for Chassis 9 PK, detailing the condition of various components. | 25th Sep 1924 | Box 72 \ 4 scan0213 | |
| Inspection report detailing the condition of engine components with a table of piston measurements. | 25th Sep 1924 | Box 72 \ 4 scan0214 | |
| Inspection report detailing wear, damage, and condition of various vehicle components. | 25th Sep 1924 | Box 72 \ 4 scan0215 | |
| Inspection report detailing wear measurements for a distributor, cylinders, valve guides, and valves. | 25th Sep 1924 | Box 72 \ 4 scan0216 | |
| Inspection report detailing the condition and measurements of a water pump, engine coupling, pipes, and rear springs with fittings. | 25th Sep 1924 | Box 72 \ 4 scan0217 | |
| Inspection report detailing wear and issues with swivels, sliding plates, and front springs and fittings. | 25th Sep 1924 | Box 72 \ 4 scan0218 | |
| Vehicle condition report detailing issues with the frame, suspension, engine, and various fittings. | 25th Sep 1924 | Box 72 \ 4 scan0219 | |
| Condition report with diagrams detailing wear on hand brake, front equalizer, steering column, and universal joint components. | 25th Sep 1924 | Box 72 \ 4 scan0220 | |
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