| Description | Date | Identifier | |
| Secret memo requesting an update on the dispatch of dummy and real radiators and bonnets. | 24th Nov 1924 | Box 66a \ 4 scan0163 | |
| Secret memo regarding modifications to car EAC.11, including a dummy radiator and special lamp fittings, to be carried out at Barkers and Lillie Hall. | 5th Nov 1924 | Box 66a \ 4 scan0164 | |
| Weight analysis of a sectioned radiator. | 5th Nov 1924 | Box 66a \ 4 scan0165 | |
| Secret memo discussing the appearance of the EAC.11 model and a steering column vibration issue. | 13th Nov 1924 | Box 66a \ 4 scan0166 | |
| Standard color and optional materials for radiator shutters on a mock-up car. | 27th Nov 1924 | Box 66a \ 4 scan0167 | |
| Secret memo from Hs to C regarding the EAC mock-up, radiator shutters, and the use of a dummy chassis. | 28th Nov 1924 | Box 66a \ 4 scan0168 | |
| Confirming radiator shutters are made of white metal and can be polished to match the radiator. | 6th Dec 1924 | Box 66a \ 4 scan0169 | |
| Investigations into vehicle overheating and recommendations for improvements and customer communication. | 10th Dec 1924 | Box 66a \ 4 scan0170 | |
| Engine cooling, a 10,000-mile test run, and an attached sketch of larger shutters. | 9th Dec 1924 | Box 66a \ 4 scan0171 | |
| Secret internal memo regarding cooling investigations and the urgent need for alterations to cars to prevent overheating and customer complaints. | 9th Dec 1924 | Box 66a \ 4 scan0172 | |
| Engine cooling issues and radiator design for the 40/50 model. | 13th Dec 1924 | Box 66a \ 4 scan0173 | |
| Supply of a sample radiator with nickel silver shutters and the issues with polishing them due to imperfections. | 15th Dec 1924 | Box 66a \ 4 scan0174 | |
| The arrival of specially finished radiator shutters from Derby. | 16th Dec 1924 | Box 66a \ 4 scan0175 | |
| Explaining the reason for the dull finish on radiator shutters. | 23th Dec 1924 | Box 66a \ 4 scan0176 | |
| Investigation into water loss from 'EAC' radiators. | 12th Mar 1925 | Box 66a \ 4 scan0177 | |
| Road tests for the cooling of an EAC engine radiator. | 31th Mar 1925 | Box 66a \ 4 scan0178 | |
| Comparing the cooling efficiency of a narrow-bladed fan against a broad-bladed fan. | 31th Mar 1925 | Box 66a \ 4 scan0179 | |
| Comparing EAC and 40/50 cars, focusing on water pump delivery and flow rates. | 31th Mar 1925 | Box 66a \ 4 scan0180 | |
| Comparison of cooling efficiencies for E.A.C. and 40/50 systems at 30 and 40 M.P.H. | 26th Mar 1925 | Box 66a \ 4 scan0181 | |
| Performance comparison graph of a standard 40/50 fan versus an experimental E.A.C. fan. | 27th Mar 1925 | Box 66a \ 4 scan0182 | |
| Secret memorandum detailing proposed modifications to a thermometer and ignition wire tube. | 20th Mar 1925 | Box 66a \ 4 scan0183 | |
| 'V' Series shutter control and the positioning of the instrument board. | 1st Mar 1925 | Box 66a \ 4 scan0184 | |
| Critique of the design for a radiator shutter, other controls, and starter carburetter handle. | 19th Apr 1925 | Box 66a \ 4 scan0185 | |
| Engine overheating, focusing on radiator tubes, thermostats, and shutters. | 5th May 1925 | Box 66a \ 4 scan0186 | |
| Radiator and cooling system design improvements for the 'X' series. | 12th May 1925 | Box 66a \ 4 scan0187 | |
| Proposed changes to the track width for the 40/50 'X' series chassis. | 12th May 1925 | Box 66a \ 4 scan0188 | |
| Reporting a failure of the radiator shutter control rod on two trials cars, resulting in damage and requesting a modification. | 21th May 1925 | Box 66a \ 4 scan0189 | |
| Water boiling tests comparing the New Phantom against the Silver Ghost, and radiator design improvements. | 20th Jun 1925 | Box 66a \ 4 scan0190 | |
| Modifications to a car's radiator and bonnet following criticism from Mr. Royce. | 1st Jul 1925 | Box 66a \ 4 scan0191 | |
| From CJ to Hs regarding the approval process for radiators and shutters for 'V' and 'W' Series. | 10th Jul 1925 | Box 66a \ 4 scan0192 | |
| Comparing the radiators for the 'V' and 'W' series chassis, detailing Mr. Royce's criticisms. | 1st Jul 1925 | Box 66a \ 4 scan0193 | |
| Modification to the 'V' type radiator and the work involved. | 9th Jul 1925 | Box 66a \ 4 scan0194 | |
| Design discrepancies and clarifications for the 'W' Series radiator, bonnet, and dash. | 13th Jul 1925 | Box 66a \ 4 scan0195 | |
| Clarifying a disagreement over radiator and chassis specifications between departments. | 13th Jul 1925 | Box 66a \ 4 scan0196 | |
| Design possibilities for 'W' and 'V' series radiators. | 13th Jul 1925 | Box 66a \ 4 scan0197 | |
| Secret memo justifying the decision to send the 7-EX experimental car to London for examination, addressing criticisms of its radiator and bonnet design. | 13th Jul 1925 | Box 66a \ 4 scan0198 | |
| Note regarding work being held up on radiator, dashboard, and bonnet for 'W' and 'X' series cars. | 1st Jul 1925 | Box 66a \ 4 scan0199 | |
| Modifications to the 'X' Series radiator shutter control and dashboard layout. | 14th Jul 1925 | Box 66a \ 4 scan0200 | |
| Clarifying a misunderstanding regarding the 'W' series radiator and bonnet design. | 15th Jul 1925 | Box 66a \ 4 scan0201 | |
| Design proposals and modifications for the 'W' Series Radiator. | 16th Jul 1925 | Box 66a \ 4 scan0202 | |
| Mr. Royce's approval for the use of 'W' series radiators and the ongoing design of a new type. | 7th Jul 1925 | Box 66a \ 4 scan0203 | |
| Design preferences for radiators, integral shutters, and bonnet louvres. | 7th Jul 1925 | Box 66a \ 4 scan0204 | |
| Engine overheating, detailing experiments on fan design and radiator cowls. | 17th Jul 1925 | Box 66a \ 4 scan0205 | |
| Continued document discussing radiator airflow efficiency based on vehicle speed and tests of the radiator matrix. | 17th Jul 1925 | Box 66a \ 4 scan0206 | |
| Seeking instructions on the specifications for Mr. Royce's car, including the radiator, bonnet, and wing irons. | 17th Jul 1925 | Box 66a \ 4 scan0207 | |
| Instructions for the 'W' series vacuum tank, radiator, and dashboard layout. | 20th Jul 1925 | Box 66a \ 4 scan0208 | |
| Instructing the Stores to dispatch one radiator bracket to Mr. Elliott for inspection. | 9th Sep 1925 | Box 66a \ 4 scan0209 | |
| Excessive wear on the 'Phantom' radiator support and a recommendation to increase the bearing surfaces. | 11th Sep 1925 | Box 66a \ 4 scan0210 | |
| The design and material choice for the New Phantom radiator support. | 15th Sep 1925 | Box 66a \ 4 scan0211 | |
| Instructions from Mr. Royce for modifying a worn Phantom radiator pivot and sphere. | 9th Sep 1925 | Box 66a \ 4 scan0212 | |
| The wear of radiator support parts for the 40/50 model and the necessity of scrapping old stock. | 17th Sep 1925 | Box 66a \ 4 scan0213 | |
| New, case-hardened radiator fixing to reduce wear on the Phantom model. | 29th Dec 1925 | Box 66a \ 4 scan0214 | |
| Unsatisfactory bonnet catches on the B.2. Series of Phantoms, and recommending further investigation before production continues. | 4th May 1926 | Box 66a \ 4 scan0215 | |
| Arguing against increasing the cooling capacity on Phantom cars, referencing a technical explanation. | 1st Jul 1926 | Box 66a \ 4 scan0216 | |
| Requesting the location of vehicle 7-FX for inspection of its new radiator with integral shutters. | 24th Aug 1926 | Box 66a \ 4 scan0217 | |
| Status of the 7-EX and 12-EX chassis, along with the testing of a new radiator for standardisation. | 25th Aug 1926 | Box 66a \ 4 scan0218 | |
| Engine cooling improvements on the Phantom model and comparing pressurized cooling with steam or evaporative methods. | 25th Aug 1926 | Box 66a \ 4 scan0219 | |
| Comparing the cooling system of the 12-EX car to the standard Phantom, and discussing pressure cooling. | 1st Oct 1926 | Box 66a \ 4 scan0220 | |
| Standardization and adoption of a Phantom radiator with integral shutters. | 16th Dec 1926 | Box 66a \ 4 scan0221 | |
| The appearance and length of the bonnet for a Phantom Radiator with Integral Shutters. | 17th Dec 1926 | Box 66a \ 4 scan0222 | |
| The aesthetic design of the Phantom radiator and the importance of maintaining the bonnet's lines. | 17th Dec 1926 | Box 66a \ 4 scan0223 | |
| Arrangement of vertical radiator shutters for the 20 HP model, adapting parts from the Phantom. | 12th Dec 1926 | Box 66a \ 4 scan0224 | |
| Modifications to the 40/50 model bonnet and radiator, including shortening it and altering the radiator thickness. | 3rd Jan 1927 | Box 66a \ 4 scan0225 | |
| Design memorandum with diagrams comparing 'Non-integral' and 'Integral' bonnet and radiator configurations. | 3rd Jan 1927 | Box 66a \ 4 scan0226 | |
| Proposed modifications to the radiator and bonnet design for improved appearance and efficiency. | 11th Jan 1927 | Box 66a \ 4 scan0227 | |
| Philosophy of gradual design alterations for the bonnet and radiator, referencing specific proposed modifications. | 11th Jan 1927 | Box 66a \ 4 scan0228 | |
| Radiator tube diameter and length for the 40/50 HP model. | 13th Jan 1927 | Box 66a \ 4 scan0229 | |
| The cost-effectiveness of producing mock-ups for alternative Phantom bonnet and radiator designs. | 1st Jan 1927 | Box 66a \ 4 scan0230 | |
| Proposed modifications to the 40/50 model's bonnet and radiator design. | 15th Jan 1927 | Box 66a \ 4 scan0231 | |
| Request to despatch two dummy Phantom radiators to Derby. | 18th Jan 1927 | Box 66a \ 4 scan0232 | |
| Requesting rough sketches for the Phantom bonnet and radiator schemes. | 18th Jan 1927 | Box 66a \ 4 scan0233 | |
| Arrangements for dummy radiators and bonnets for a Phantom model. | 21th Jan 1927 | Box 66a \ 4 scan0234 | |
| Design and specifications of dummy models for a new Phantom radiator. | 24th Jan 1927 | Box 66a \ 4 scan0235 | |
| Design changes and specifications for a new Phantom radiator model. | 24th Jan 1927 | Box 66a \ 4 scan0236 | |
| Modifications to radiator designs with integral shutters and comparing front area increases across various car series. | 25th Jan 1927 | Box 66a \ 4 scan0237 | |
| Technical report comparing radiator cooling efficiency and total area for various models, including V series, W series, and EAC.8. | 28th Jan 1927 | Box 66a \ 4 scan0238 | |
| Dimensional changes and disagreements regarding the Phantom Radiator. | 28th Jan 1927 | Box 66a \ 4 scan0239 | |
| Design iterations and modifications to the Phantom radiator to improve body lines. | 1st Feb 1927 | Box 66a \ 4 scan0240 | |
| Design modifications and the appearance of a radiator. | 1st Jan 1927 | Box 66a \ 4 scan0241 | |
| Design and dimensions of the Phantom radiator and bonnet, comparing different proposals. | 2nd Feb 1927 | Box 66a \ 4 scan0242 | |
| Three proposed models for the Phantom radiator design. | 4th Feb 1927 | Box 66a \ 4 scan0243 | |
| Proposed improvements to the Phantom radiator, bonnet, and integral shutters. | 10th Feb 1927 | Box 66a \ 4 scan0244 | |
| Design modifications for bonnet fasteners, locks, and the radiator on the 20 HP model. | 17th Mar 1927 | Box 66a \ 4 scan0245 | |
| Request for drawings and parts for a 40/50HP Phantom Chassis Radiator for testing. | 17th Mar 1927 | Box 66a \ 4 scan0246 | |
| The design of the 40/50 radiator and bonnet, considering its thick appearance and the driver's view. | 1st Mar 1927 | Box 66a \ 4 scan0247 | |
| The matrix tubes and construction for the Phantom radiator. | 31th Mar 1927 | Box 66a \ 4 scan0248 | |
| Requesting prints and a test set of radiator parts for a 40/50HP chassis. | 31th Mar 1927 | Box 66a \ 4 scan0249 | |
| Design specifications for new experimental radiators and bonnets. | 7th Apr 1927 | Box 66a \ 4 scan0250 | |
| Design of bonnets and radiators, including tube size, radiator height, and the cancellation of bonnet shutters. | 29th Apr 1927 | Box 66a \ 4 scan0251 | |
| Improving appearance by reducing radiator thickness and using plain bonnets or louvres instead of shutters. | 9th May 1927 | Box 66a \ 4 scan0252 | |
| Experimenting with fan placement on the Phantom radiator and reverting to an original shutter control design. | 9th May 1927 | Box 66a \ 4 scan0253 | |
| Improvements to the Phantom's steering and radiator, focusing on weight reduction and design advantages. | 9th Jul 1927 | Box 66a \ 4 scan0254 | |
| The issues with automatically controlled radiator shutters, their unsuitability in the USA, and a new warning lamp solution. | 1st Sep 1927 | Box 66a \ 4 scan0255 | |
| Confirmation of a telegram querying chassis specifications and requesting the immediate build of two units. | 18th Oct 1927 | Box 66a \ 4 scan0256 | |
| Chassis modifications for the Sports Phantom model. | 20th Oct 1927 | Box 66a \ 4 scan0257 | |
| Proposed modifications to the Phantom F.2 series front axle and radiator. | 21th Oct 1927 | Box 66a \ 4 scan0258 | |
| Use of 7mm tubes instead of 8mm tubes for a narrower radiator. | 9th Nov 1927 | Box 66a \ 4 scan0259 | |
| Proposed design improvement for the Phantom model's radiator. | 11th Nov 1927 | Box 66a \ 4 scan0260 | |
| New shutter and starter carburetter controls, and the arrangement of instruments and lighting for sports cars. | 28th Dec 1927 | Box 66a \ 4 scan0261 | |
| Development and adoption of a new, narrower radiator for the Phantom Sports Chassis. | 29th Dec 1927 | Box 66a \ 4 scan0262 | |
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