| Description | Date | Identifier | |
| Cost implications and manufacturing challenges of Phantom II square tube radiators. | 24th Mar 1930 | Box 15 \ 1 Scan244 | |
| Single point radiator suspension for the 10,000 mile car and its future application. | 24th Mar 1930 | Box 15 \ 1 Scan245 | |
| Test report on 'radiator jellying', comparing steering and ride harshness with different front spring stiffness on EX chassis models. | 27th Mar 1930 | Box 15 \ 1 Scan246 | |
| Body distortion caused by radiator 'jellying' and the effect of torque reaction dampers. | 27th Mar 1930 | Box 15 \ 1 Scan247 | |
| Proposed adaptations to a single point radiator suspension for an experiment. | 27th Mar 1930 | Box 15 \ 1 Scan248 | |
| Modified radiator mounting scheme to fix a 'jellying' issue. | 1st Apr 1930 | Box 15 \ 1 Scan249 | |
| 'radiator jellying' issue and the plan to send car 1-WJ for a fix. | 2nd Apr 1930 | Box 15 \ 1 Scan250 | |
| Analysis of the Smith's Calorstat for operating Phantom II radiator shutters, including effort calculations and comparison with a Sylphon thermostat. | 3rd Apr 1930 | Box 15 \ 1 Scan251 | |
| The force required to operate shutters, comparing two instruments and noting insufficient effort without a return spring. | 3rd Apr 1930 | Box 15 \ 1 Scan252 | |
| Graph showing the effort available from a Smith's Calorstat for PII radiator shutters against temperature. | 3rd Apr 1930 | Box 15 \ 1 Scan253 | |
| Page stamped by the Print Room in Derby. | 3rd Apr 1930 | Box 15 \ 1 Scan254 | |
| Testing wider 'Dermatine' washers for Phantom II radiator caps, recommending the modification for production. | 3rd Apr 1930 | Box 15 \ 1 Scan255 | |
| Unsatisfactory rubber rings in Phantom II radiator caps and the testing of new 'Dermatine' rings. | 4th Apr 1930 | Box 15 \ 1 Scan256 | |
| The cancellation and alteration of Phantom II Radiator filler caps. | 11th Apr 1930 | Box 15 \ 1 Scan257 | |
| Standardisation of nickel coated copper cylinder head tubes. | 24th Mar 1930 | Box 15 \ 1 Scan258 | |
| Failure to cure 'Radiator Jellying' on car 1-WJ and requesting to keep the vehicle for further testing. | 23th Apr 1930 | Box 15 \ 1 Scan259 | |
| 10,000-mile test of a special gauze radiator filter designed to address radiator troubles. | 28th Apr 1930 | Box 15 \ 1 Scan260 | |
| Request to obtain two types of springs for radiator mounting with detailed specifications. | 23th Apr 1930 | Box 15 \ 1 Scan261 | |
| Sample of foreign matter taken from the filter of engine 23-EX, questioning if it's related to new galvanised cylinders. | 30th Apr 1930 | Box 15 \ 1 Scan262 | |
| Typed letter to G.W. Hancock in France regarding a car's overheating problem and a potential axle leak. | 30th Apr 1930 | Box 15 \ 1 Scan263 | |
| Continued discussion on resolving an axle oil leak with a vented plug on car 24-EX. | 30th Apr 1930 | Box 15 \ 1 Scan264 | |
| The design and operation of thermostat-controlled radiator shutters. | 30th Apr 1930 | Box 15 \ 1 Scan265 | |
| Modifications to the Phantom II radiator suspension system, including the mounting and springs. | 30th Apr 1930 | Box 15 \ 1 Scan266 | |
| Testing parameters and operating temperatures for car shutter thermostats. | 1st May 1930 | Box 15 \ 1 Scan267 | |
| The cooling performance of the 23-EX radiator, with comparisons to other models and plans for further testing. | 5th May 1930 | Box 15 \ 1 Scan268 | |
| Continued page discussing car cooling performance based on recorded air and water temperatures. | 5th May 1930 | Box 15 \ 1 Scan269 | |
| Solutions for radiator vibration ('jellying'), dampers, frame torsion, and universal rubber body mounting. | 5th May 1930 | Box 15 \ 1 Scan270 | |
| List of methods for insulating the power unit, body, and passengers from the vehicle frame. | 5th May 1930 | Box 15 \ 1 Scan271 | |
| Scheme for a centre point radiator mounting, with a request to produce four sets for testing. | 6th May 1930 | Box 15 \ 1 Scan272 | |
| Use of a double spring versus a single spring for single-point radiator suspension. | 7th May 1930 | Box 15 \ 1 Scan273 | |
| Specifications and load calculations for centre point radiator mounting springs. | 6th May 1930 | Box 15 \ 1 Scan274 | |
| Provisional patent for a radiator mounting design on the 40/50 HP model. | 19th May 1930 | Box 15 \ 1 Scan275 | |
| Modification of a double-acting thermostat for radiator shutters, including specific design notes and requests. | 24th May 1930 | Box 15 \ 1 Scan276 | |
| Modifications to the Phantom II L.H. Chassis, including filters, shutters, ignition, and radiator support. | 26th May 1930 | Box 15 \ 1 Scan277 | |
| Radiator support schemes for the L.H. Phantom and N. 2 series chassis. | 12th Jun 1930 | Box 15 \ 1 Scan278 | |
| Reverting the activation temperature of the radiator thermometer's red warning light back to 97°C. | 16th Jun 1930 | Box 15 \ 1 Scan279 | |
| The Brooklands tests of the Phantom II cooling system in June 1930. | 25th Jun 1930 | Box 15 \ 1 Scan280 | |
| Analysis of engine cooling improvements through various bonnet and undershield ventilation configurations. | 25th Jun 1930 | Box 15 \ 1 Scan281 | |
| Vehicle cooling systems, including bonnets, radiators, and oil temperature, for operation in hot climates. | 25th Jun 1930 | Box 15 \ 1 Scan282 | |
| Car performance testing, detailing issues with oil temperature, ignition, fuel supply, and lap speeds. | 25th Jun 1930 | Box 15 \ 1 Scan283 | |
| Performance tests and issues with experimental car models, specifically focusing on slow speed and overheating. | 25th Jun 1930 | Box 15 \ 1 Scan284 | |
| Report page detailing tests on fan belt tension, water circulation, and the American Phantom II. | 25th Jun 1930 | Box 15 \ 1 Scan285 | |
| Summary of development issues and potential improvements for the Phantom II's cooling system, including bonnet ventilation, fan, and radiator. | 25th Jun 1930 | Box 15 \ 1 Scan286 | |
| The necessity of ventilated and louvred bonnets for cars used at high speeds on the Continent and English roads. | 25th Jun 1930 | Box 15 \ 1 Scan287 | |
| Graph plotting top water, bottom water, and oil temperatures against miles run under specific test conditions. | 2nd Jul 1938 | Box 15 \ 1 Scan288 | |
| Blank document with a Print Room stamp from Derby. | 2nd Jul 1938 | Box 15 \ 1 Scan289 | |
| Graph comparing ambient temperatures that cause overheating in a Standard PII Cabriolet with various ventilation configurations. | 2nd Jul 1938 | Box 15 \ 1 Scan290 | |
| Graph plotting top and bottom engine water temperatures against various bonnet, shutter, and fan configurations. | 2nd Jul 1938 | Box 15 \ 1 Scan291 | |
| Graph IV showing Oil and Top Water temperatures versus miles run under varying car conditions. | 2nd Jul 1938 | Box 15 \ 1 Scan292 | |
| Bar chart comparing critical atmospheric temperatures for a spring tensioned fan versus a positively tensioned fan belt at 62 M.P.H. | 2nd Jul 1938 | Box 15 \ 1 Scan293 | |
| Graph comparing top water temperature over distance for two experimental setups, 18 E.X. and 19 E.X. | 2nd Jul 1938 | Box 15 \ 1 Scan294 | |
| Blueprint showing a modification to the front undershield to improve the cooling system. | 2nd Jul 1930 | Box 15 \ 1 Scan295 | |
| Mostly blank document page with a purple ink stamp from the print room. | 2nd Jul 1930 | Box 15 \ 1 Scan296 | |
| Request to fit a radiator matrix from a 24-EX model into a different radiator for testing on a 19-EX model. | 26th Jun 1930 | Box 15 \ 1 Scan297 | |
| Recommendations to resolve an overheating issue on car 117-WJ by adjusting the Phantom II fan belt and removing the front undershield. | 27th Jun 1930 | Box 15 \ 1 Scan298 | |
| Summary of circulation test results for the Phantom II engine, detailing findings from six different data curves. | 1st Jul 1930 | Box 15 \ 1 Scan299 | |
| Two graphs comparing engine coolant flow rates against RPM for different venturi and radiator outlet configurations. | 1st Jul 1930 | Box 15 \ 1 Scan300 | |
| Stamped document from the Print Room. | 1st Jul 1930 | Box 15 \ 1 Scan301 | |
| Two graphs comparing left-hand and right-hand engine delivery, and venturi versus actual quantity measurements. | 1st Jul 1930 | Box 15 \ 1 Scan302 | |
| Water circulation test graphs for PII, comparing pump delivery against water temperature for different radiator configurations. | 1st Jul 1930 | Box 15 \ 1 Scan303 | |
| Heavily faded document with an illegible main body and a purple ink stamp from the Test Room. | 1st Jul 1930 | Box 15 \ 1 Scan304 | |
| Modifications for increased cooling on 25 HP & 45 HP models, comparing shutters, louvres, and radiator designs. | 4th Jul 1930 | Box 15 \ 1 Scan305 | |
| Modifications to the thermostatically operated shutters for the 25 HP model, specifically regarding the thermostat levers. | 5th Jul 1930 | Box 15 \ 1 Scan306 | |
| Note on the simplification of the automatic radiator control for parts interchangeability between 25HP and 45HP models. | 8th Jul 1930 | Box 15 \ 1 Scan307 | |
| Second report on Brooklands radiator tests, detailing issues with the autovac fuel supply system. | 9th Jul 1930 | Box 15 \ 1 Scan308 | |
| Investigation into high-temperature effects on air intake, vacuum pump efficiency, and fuel supply. | 9th Jul 1930 | Box 15 \ 1 Scan309 | |
| The cooling system fan belt and mixture strength performance. | 9th Jul 1930 | Box 15 \ 1 Scan310 | |
| Resolving pre-ignition and over-heating issues, with comparisons of radiator matrices and bottom outlets. | 9th Jul 1930 | Box 15 \ 1 Scan311 | |
| Vehicle cooling system circulation and water temperature tests at various speeds. | 9th Jul 1930 | Box 15 \ 1 Scan312 | |
| Car overheating issues, discussing the effects of wind, fan performance, and temperature readings. | 9th Jul 1930 | Box 15 \ 1 Scan313 | |
| Recommendations for improvements to the fan belt, autovac, bonnet shutters, radiator, and fuel system. | 9th Jul 1930 | Box 15 \ 1 Scan314 | |
| Two graphs analysing the effects of fan type, vehicle speed and radiator ventilation on cooling system water temperatures. | 2nd Jul 1930 | Box 15 \ 1 Scan315 | |
| Blank document page with a purple date stamp in the bottom right corner. | 12th Jul 1930 | Box 15 \ 1 Scan316 | |
| Study containing graphs and diagrams on the effect of water circulation on engine overheating. | 2nd Jul 1930 | Box 15 \ 1 Scan317 | |
| Graph plotting top and bottom water temperatures against seven different engine cooling configurations during a test at Brooklands. | 2nd Jul 1930 | Box 15 \ 1 Scan318 | |
| Graph showing the effect of water temperature on the complete car circulation system at a constant engine speed. | 12th Jul 1930 | Box 15 \ 1 Scan319 | |
| Blank document page with a purple ink date stamp from Derby. | 12th Jul 1930 | Box 15 \ 1 Scan320 | |
| Cooling tests on 25 HP and 40/50 HP engines, focusing on radiator tube design and airflow. | 1st Jul 1930 | Box 15 \ 1 Scan321 | |
| On-track testing of a square tube radiator against other cars. | 1st Jul 1930 | Box 15 \ 1 Scan322 | |
| Water loss from a radiator due to top tank size reduction and potential solutions. | 14th Jul 1930 | Box 15 \ 1 Scan323 | |
| Trial of parts to reduce radiator 'jellying' and the replacement of worn pump components. | 14th Jul 1930 | Box 15 \ 1 Scan324 | |
| Radiator tube size, petrol mixture, and engine cooling for car work. | 14th Jul 1930 | Box 15 \ 1 Scan325 | |
| Recurring water loss issues on the 24-EX model during a 10,000-mile test in France. | 17th Jul 1930 | Box 15 \ 1 Scan326 | |
| Production timelines for the N.2 series chassis and a 'jellying' issue with the single point suspension radiator. | 18th Jul 1930 | Box 15 \ 1 Scan327 | |
| Investigation into the cause of water loss from the new radiator on the 25-EX model. | 22th Jul 1930 | Box 15 \ 1 Scan328 | |
| Diagnosing and resolving radiator water loss due to splashing and pitching. | 22th Jul 1930 | Box 15 \ 1 Scan329 | |
| Continuation page of a letter advising that a radiator baffle cannot be fitted without dismantling the top tank. | 22th Jul 1930 | Box 15 \ 1 Scan330 | |
| Radiator water loss on car 24-EX, comparing it to a similar issue on car 23-EX. | 22th Jul 1930 | Box 15 \ 1 Scan331 | |
| Depot sheet outlining procedures for diagnosing and fixing issues related to the overheating of cooling water. | 1st Aug 1930 | Box 15 \ 1 Scan332 | |
| Troubleshooting and maintenance procedures for the engine cooling system, focusing on fan belts and water pump issues. | 1st Mar 1930 | Box 15 \ 1 Scan333 | |
| Guide on diagnosing and rectifying engine overheating issues, covering bonnet ventilation, mixture strength, and the use of a cut-out. | 1st Aug 1930 | Box 15 \ 1 Scan334 | |
| Guidance on vehicle overheating, the function of the red warning light, and radiator shutter operation. | 16th Aug 1930 | Box 15 \ 1 Scan335 | |
| Blueprint detailing a modification to the left-hand Phase II radiator top tank, including a change to its capacity. | 16th Aug 1930 | Box 15 \ 1 Scan336 | |
| Alteration of Phantom II radiator thermometers to address over-heating problems. | 26th Aug 1930 | Box 15 \ 1 Scan337 | |
| Standardisation of a single point radiator mounting to prevent movement. | 3rd Jun 1930 | Box 15 \ 1 Scan338 | |
| Scheme for a discharge nozzle and spring-loaded valve to prevent water loss from a new radiator. | 31th Aug 1930 | Box 15 \ 1 Scan339 | |
| Causes and potential solutions for radiator water loss on the Phantom II model. | 31th Aug 1930 | Box 15 \ 1 Scan340 | |
| Technical discussion on the design and effectiveness of square tube radiators and bonnet ventilation. | 31th Aug 1930 | Box 15 \ 1 Scan341 | |
| Poor design of bonnet locks and the high cost and unsatisfactory nature of vertical louvres. | 31th Aug 1930 | Box 15 \ 1 Scan342 | |
| On radiator shutter friction, arguing against using a closing spring and suggesting design modifications to the lower bearing instead. | 31th Aug 1930 | Box 15 \ 1 Scan343 | |
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