| Description | Date | Identifier | |
| Explaining the design compromise of the Phantom II's cooling system in response to overheating complaints. | 1st Sep 1930 | Box 15 \ 1 Scan344 | |
| Instructions regarding the engine cooling system, radiator shutters, warning lamp, and bonnet ventilation. | 2nd Sep 1938 | Box 15 \ 1 Scan345 | |
| Guidance on interpreting the red engine warning lamp in various weather conditions. | 2nd Sep 1930 | Box 15 \ 1 Scan346 | |
| Request to build a radiator matrix for the 25-EX car for improved efficiency. | 3rd Sep 1930 | Box 15 \ 1 Scan347 | |
| Standardisation of chassis parts relating to the thermometer warning light operating temperature. | 1st Aug 1930 | Box 15 \ 1 Scan348 | |
| Single point radiator mounting for the 24-EX model, intended as a fix for 'jelliers' complaints. | 5th Sep 1930 | Box 15 \ 1 Scan349 | |
| Sketch of Radiator Side Fittings on a 24EX, a combination of schematics N.Sch.3062 and N.Sch.3059. | 5th Sep 1923 | Box 15 \ 1 Scan350 | |
| Recommending the fitment of standardised single point radiator mountings to cure 'jellying' on specific chassis. | 5th Sep 1930 | Box 15 \ 1 Scan351 | |
| Modifications to the radiator shutter bottom bearings for the 20/25HP model. | 9th Jun 1930 | Box 15 \ 1 Scan352 | |
| Sources of friction in radiator shutters and proposing a solution. | 8th Sep 1930 | Box 15 \ 1 Scan353 | |
| Blueprint of shutter operating toggles. | 8th Sep 1930 | Box 15 \ 1 Scan354 | |
| Date stamp from the Print Room in Derby. | 8th Sep 1930 | Box 15 \ 1 Scan355 | |
| Test report on the performance of radiator shutters fitted with a thermostat and spring. | 8th Sep 1930 | Box 15 \ 1 Scan356 | |
| Request to modify car 22-EX for radiator tests, specifically to change the radiator mounting. | 9th Sep 1930 | Box 15 \ 1 Scan357 | |
| Problems with the Phantom II Left Hand Chassis following 10,000 miles of testing. | 9th Sep 1930 | Box 15 \ 1 Scan358 | |
| Modifications to the clutch, carburetter, and brakes for experimental cars. | 9th Sep 1930 | Box 15 \ 1 Scan359 | |
| Modifications to the Phantom II radiator tubes and the resulting impact on cooling performance. | 9th Sep 1930 | Box 15 \ 1 Scan360 | |
| Concluding page of a report comparing a subject to the original Phantom II, stating a complete report is in preparation. | 11th Sep 1930 | Box 15 \ 1 Scan361 | |
| The production and testing of square tube radiators using brass and copper. | 11th Sep 1930 | Box 15 \ 1 Scan362 | |
| The production status of radiator tubes ordered from I.C.I. Metals Ltd. for the M2 Series chassis. | 11th Sep 1930 | Box 15 \ 1 Scan363 | |
| Radiator thermometer test with results at 30 and 45 m.p.h. | 12th Sep 1930 | Box 15 \ 1 Scan364 | |
| Replacing experimental parts with standardised centre point radiator mountings on specific cars. | 15th Sep 1930 | Box 15 \ 1 Scan365 | |
| Urgency of testing a non-spilling radiator filler cap to solve a water pumping issue. | 15th Sep 1930 | Box 15 \ 1 Scan366 | |
| Development of a new, larger, non-spilling radiator filler cap and proposing it become standard for the N.2 series. | 15th Sep 1930 | Box 15 \ 1 Scan367 | |
| Actions on various batches of radiator tubes for the 40/50 HP N.2 Series Chassis. | 15th Sep 1930 | Box 15 \ 1 Scan368 | |
| Design requirements for thermostatically controlled radiator shutters and cooling system improvements. | 16th Sep 1930 | Box 15 \ 1 Scan369 | |
| Radiator cooling problems on the Phantom II model, specifically an alteration that increased running temperatures. | 16th Sep 1930 | Box 15 \ 1 Scan370 | |
| Radiator cooling issues on Phantom I and II models, leading to the adoption of a more efficient square tube radiator. | 18th Sep 1930 | Box 15 \ 1 Scan371 | |
| Use of unpolished 'Staybrite' shutters on experimental cars to test their appearance and durability. | 20th Sep 1930 | Box 15 \ 1 Scan372 | |
| Modification to the thermostat linkage to resolve issues with radiator shutter friction. | 20th Sep 1930 | Box 15 \ 1 Scan373 | |
| Status of orders and conversions for radiator tubes for the 40/50-HP Chassis N2 Series. | 23th Sep 1930 | Box 15 \ 1 Scan374 | |
| Letter from I.C.I. Metals Limited concerning the production, conversion, and pricing of tubes. | 22th Sep 1930 | Box 15 \ 1 Scan375 | |
| Request to fit a dented tube matrix radiator to car 19-EX to be sent to Brooklands. | 23th Sep 1930 | Box 15 \ 1 Scan376 | |
| Correcting a prior analysis of radiator efficiency for the Phantom II, specifically regarding an error in tube size measurement. | 24th Sep 1930 | Box 15 \ 1 Scan377 | |
| Radiator cooling efficiency, comparing direct versus indirect methods, with a supporting graph. | 24th Sep 1930 | Box 15 \ 1 Scan378 | |
| Radiator efficiency, heat dissipation, and a comparison of different radiator tube types. | 24th Sep 1930 | Box 15 \ 1 Scan379 | |
| Technical comparison of different radiator tube designs, focusing on shape, surface area, and thickness. | 24th Sep 1930 | Box 15 \ 1 Scan380 | |
| Improving engine cooling performance by modifying radiator tubes and assessing temperature changes. | 24th Sep 1930 | Box 15 \ 1 Scan381 | |
| Continued page discussing the success of the Chrysler radiator design and its potential drawbacks. | 24th Sep 1930 | Box 15 \ 1 Scan382 | |
| Comparative table analyzing the performance of various radiator tube designs. | 24th Sep 1930 | Box 15 \ 1 Scan383 | |
| Graph comparing the performance of different types of radiator cores for slow-speed cooling. | 24th Sep 1930 | Box 15 \ 1 Scan384 | |
| Blank document page with a Print Room reception stamp. | 24th Sep 1930 | Box 15 \ 1 Scan385 | |
| Drawing of a square matrix tube with annealing and pressure test instructions. | 20th Sep 1927 | Box 15 \ 1 Scan386 | |
| With a sketch comparing a parallel tube and a bulged tube. | 25th Sep 1930 | Box 15 \ 1 Scan387 | |
| The inspection of radiator tubes to determine variations in size and ovality. | 25th Sep 1930 | Box 15 \ 1 Scan388 | |
| Table detailing measurements and tolerances for radiator matrix tubes across various production batches. | 30th Jan 1931 | Box 15 \ 1 Scan389 | |
| Request to build a 6mm parallel square tube radiator for the 19-EX car, for testing at Brooklands. | 29th Sep 1930 | Box 15 \ 1 Scan390 | |
| Improvements to the radiator and cooling system for the P.2 & 25HP cars. | 29th Sep 1930 | Box 15 \ 1 Scan391 | |
| Holding material for a new square type radiator and trials comparing horizontal vs vertical louvres. | 30th Sep 1930 | Box 15 \ 1 Scan392 | |
| Modifications and feedback on a vehicle's cooling system. | 30th Oct 1930 | Box 15 \ 1 Scan393 | |
| Corrosion issues with unpolished staybright radiator shutters and experimenting with different finishing methods. | 3rd Oct 1930 | Box 15 \ 1 Scan394 | |
| Inconsistent test results for a square tube radiator at Brooklands. | 7th Oct 1930 | Box 15 \ 1 Scan395 | |
| Requesting a comparative test between two radiator types and their fitting to car 20-EX for towing tests. | 8th Oct 1930 | Box 15 \ 1 Scan396 | |
| Car overheating issues, referencing Gallay radiators and feedback from a client in Italy. | 13th Oct 1930 | Box 15 \ 1 Scan397 | |
| Table showing the results of various radiator and louvre configurations tested at different speeds. | 14th Oct 1930 | Box 15 \ 1 Scan398 | |
| Comparison of weight and dimensions between solid strip and rolled strip radiator tubes. | 14th Oct 1930 | Box 15 \ 1 Scan399 | |
| Proposed solution for overheating by improving radiator efficiency with indented tubes. | 13th Oct 1930 | Box 15 \ 1 Scan400 | |
| Sixth Brooklands Report on a series of tests conducted on six different types of radiator core. | 14th Oct 1930 | Box 15 \ 1 Scan401 | |
| Continuation of a report detailing tests on various radiator tube designs to improve performance and save weight. | 14th Oct 1930 | Box 15 \ 1 Scan402 | |
| Report comparing the efficiency of different radiator tubes and a Gallay radiator. | 4th Oct 1930 | Box 15 \ 1 Scan403 | |
| Radiator tube tests, comparing samples from Rolls-Royce of America with other designs. | 14th Oct 1930 | Box 15 \ 1 Scan404 | |
| Performance comparison of square and round radiator tubes at full throttle and low speeds. | 14th Oct 1930 | Box 15 \ 1 Scan405 | |
| Comparative analysis of different radiator types, detailing performance under various conditions and physical specifications. | 14th Oct 1930 | Box 15 \ 1 Scan406 | |
| Graph of water flow tests on a PII No 7 unit with a standard radiator. | 14th Oct 1930 | Box 15 \ 1 Scan407 | |
| Heavily faded internal document with a purple company stamp. | 14th Oct 1930 | Box 15 \ 1 Scan408 | |
| Fitting radiators with different types of dented round and square tubes. | 4th Oct 1930 | Box 15 \ 1 Scan409 | |
| Improvements to radiators and bonnets, including square tubes, overflow valves, and bonnet vents. | 14th Oct 1930 | Box 15 \ 1 Scan410 | |
| Efficiency improvements gained by adding indentations to radiator tubes to solve overheating issues. | 15th Oct 1930 | Box 15 \ 1 Scan411 | |
| Proposing an experimental modification for the 40/50 HP Radiator Suspension Spring, Type HS.299. | 15th Oct 1930 | Box 15 \ 1 Scan412 | |
| Overheating issues and radiator modifications on the Phantom II model. | 18th Oct 1930 | Box 15 \ 1 Scan413 | |
| Results of radiator tests, comparing different tube and bonnet designs. | 20th Oct 1930 | Box 15 \ 1 Scan414 | |
| Radiator design, comparing 7mm square tubes with round tubes for improved performance and cost-effectiveness. | 20th Oct 1930 | Box 15 \ 1 Scan415 | |
| Table comparing critical atmospheric temperatures for different radiator types under various driving conditions. | 21th Oct 1930 | Box 15 \ 1 Scan416 | |
| Immediate implementation of a tube indentation modification to prevent overheating. | 21th Oct 1930 | Box 15 \ 1 Scan417 | |
| The disposal of two custom-built, more efficient radiators. | 23th Oct 1930 | Box 15 \ 1 Scan418 | |
| Letter regarding radiator tube gauges and suspension 'pitching' issues for the Phantom II model. | 24th Oct 1930 | Box 15 \ 1 Scan419 | |
| Fitting and testing of new square and round tube radiator matrices. | 24th Oct 1930 | Box 15 \ 1 Scan420 | |
| Recommending the immediate adoption of indented radiator tubes to solve an overheating issue. | 25th Oct 1930 | Box 15 \ 1 Scan421 | |
| Criticisms and potential improvements for vehicle bonnets and radiators. | 25th Oct 1930 | Box 15 \ 1 Scan422 | |
| Design suggestions for a detachable filler cap, horizontal louvres, and bonnet sides. | 25th Oct 1930 | Box 15 \ 1 Scan423 | |
| Request to fit a radiator with a new W.W. scheme of centre point mounting to the 'Bump' chassis for testing. | 27th Oct 1930 | Box 15 \ 1 Scan424 | |
| Agreeing to proceed with a modification to radiator tubes to solve overheating issues. | 27th Oct 1930 | Box 15 \ 1 Scan425 | |
| Design and cost of square versus round radiator tubes and advocating for modern bonnet shutters. | 27th Oct 1930 | Box 15 \ 1 Scan426 | |
| Performance of square versus round radiator tubes and bonnet ventilation design. | 30th Oct 1930 | Box 15 \ 1 Scan427 | |
| Radiator and acceleration test results from Brooklands. | 31th Oct 1930 | Box 15 \ 1 Scan428 | |
| Quarterly report on customer complaints regarding radiators, fabric couplings, and shock absorbers. | 3rd Nov 1930 | Box 15 \ 1 Scan429 | |
| Stock and availability of radiators for the Phantom II. | 5th Nov 1930 | Box 15 \ 1 Scan430 | |
| Results of radiator tests comparing different tube designs at Brooklands. | 6th Nov 1930 | Box 15 \ 1 Scan431 | |
| Continued memorandum discussing the use of wind tunnels for winter testing. | 6th Nov 1930 | Box 15 \ 1 Scan432 | |
| The non-production of the E.81389 tube for the Phantom II square radiator, recommending an order be placed. | 10th Nov 1930 | Box 15 \ 1 Scan433 | |
| Two complaints of leaking radiators found during a visit to Cricklewood. | 20th Nov 1930 | Box 15 \ 1 Scan434 | |
| Test report on a thermostat marked 'A', detailing water temperature readings and a jamming failure which caused the engine to boil. | 20th Nov 1930 | Box 15 \ 1 Scan435 | |
| Evolution of induction systems and carburetter heating, including thermostatically controlled shutters. | 25th Nov 1930 | Box 15 \ 1 Scan436 | |
| Thermostat settings and 'B' filling for the Phantom II model. | 29th Nov 1930 | Box 15 \ 1 Scan437 | |
| The design and layout for B, C and D type pedals, noting differences from the 'W' series. | 1st Nov 1925 | Box 15 \ 2 Scan001 | |
| Layout of the accelerator pedal for 'C' and 'D' type vehicles, referencing schematic N.sch.2073. | 11th Nov 1925 | Box 15 \ 2 Scan002 | |
| Various positions of the accelerator pedal for the 'W' series, with reference to the Silver Ghost and New Phantom models. | 5th Nov 1925 | Box 15 \ 2 Scan003 | |
| Proposal for the construction of a brake pedal, referencing drawing N.sch.2141. | 10th Feb 1926 | Box 15 \ 2 Scan004 | |
| Pedal arrangement for the EAC-7 model, referencing schematics and clutch travel modifications. | 31th May 1926 | Box 15 \ 2 Scan005 | |
| Investigation into lost foot pedal movement and elasticity in the braking system. | 28th Jan 1927 | Box 15 \ 2 Scan006 | |
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