| Description | Date | Identifier | |
| Description and patent suggestions for a non-expanding carburetter's accelerator pump. | 23th Jul 1930 | West Wittering \ U \ 2January1930-September1930 Scan228 | |
| Description of a carburetter's starting device, piston valve, and other novel features of the P. 2. non-expanding carburetter. | 24th Jul 1930 | West Wittering \ U \ 2January1930-September1930 Scan229 | |
| Sending schemes for pipe coils related to the 20/25HP centralised chassis lubrication system. | 24th Jul 1930 | West Wittering \ U \ 2January1930-September1930 Scan230 | |
| Improved aero engine cylinder construction with a new steel and rubber ring joint design. | 24th Jul 1930 | West Wittering \ U \ 2January1930-September1930 Scan231 | |
| The design, modifications, and fitting instructions for a Front Apron (P.2) on the Phantom chassis. | 24th Jul 1930 | West Wittering \ U \ 2January1930-September1930 Scan232 | |
| Arrangement of controls for the starting carburetter with a single universal joint. | 25th Jul 1930 | West Wittering \ U \ 2January1930-September1930 Scan233 | |
| Request to send longer bolts to coachbuilder Barker's for a body's rear support. | 25th Jul 1930 | West Wittering \ U \ 2January1930-September1930 Scan234 | |
| Leaking backing light switch and potential design or fitting modifications to fix the issue. | 14th Aug 1930 | West Wittering \ U \ 2January1930-September1930 Scan235 | |
| Request for replacement copies of mislaid drawings for a battery, a petrol tank fitting scheme, and a related critical note. | 14th Aug 1930 | West Wittering \ U \ 2January1930-September1930 Scan236 | |
| Modifications to petrol tank fittings, reserve tank device, and luggage grids. | 14th Aug 1930 | West Wittering \ U \ 2January1930-September1930 Scan237 | |
| Design requirements for a luggage grid, rear apron, and petrol tank. | 15th Aug 1930 | West Wittering \ U \ 2January1930-September1930 Scan238 | |
| Report addressing points arising from a 6,000-mile test of the 24-EX vehicle. | 15th Aug 1930 | West Wittering \ U \ 2January1930-September1930 Scan239 | |
| Potential improvements for shutters, carburation, and dynamo charging. | 16th Aug 1930 | West Wittering \ U \ 2January1930-September1930 Scan240 | |
| New locomotive-type brake shoe design for the front axle to address brake squeaking. | 16th Aug 1930 | West Wittering \ U \ 2January1930-September1930 Scan241 | |
| Modifications to the bonnet, dash, and radiator for the 20/25HP model. | 16th Aug 1930 | West Wittering \ U \ 2January1930-September1930 Scan242 | |
| Scheme for the 20HP centralised chassis lubrication system on the front axle. | 18th Aug 1930 | West Wittering \ U \ 2January1930-September1930 Scan243 | |
| The failure of aluminium exhaust boxes and suggesting a switch to cast iron or other stronger alloys. | 20th Aug 1930 | West Wittering \ U \ 2January1930-September1930 Scan244 | |
| Piping arrangement for the centralised chassis lubrication system on the 20/25HP model. | 20th Aug 1930 | West Wittering \ U \ 2January1930-September1930 Scan245 | |
| Brake thumping and carburation performance of a 25HP car following a 700-mile drive. | 20th Aug 1930 | West Wittering \ U \ 2January1930-September1930 Scan246 | |
| Engine oil consumption and potential remedies to increase the oil reserve. | 21th Aug 1930 | West Wittering \ U \ 2January1930-September1930 Scan247 | |
| The proposal to place the starting carburetter control stop on the dashboard. | 21th Aug 1930 | West Wittering \ U \ 2January1930-September1930 Scan248 | |
| Design features of new, non-expanding twin carburettors. | 21th Aug 1930 | West Wittering \ U \ 2January1930-September1930 Scan249 | |
| Page from a memo discussing carburetter design improvements and their potential application. | 21th Aug 1930 | West Wittering \ U \ 2January1930-September1930 Scan250 | |
| Design of the L.H. P. 2 sump drain plug, comparing an original design with a newer one featuring an insert. | 21th Aug 1930 | West Wittering \ U \ 2January1930-September1930 Scan251 | |
| Replacement of the 'China' engine with the 'Japan' engine, citing advantages in reliability and suitability for double carburetter and ignition. | 22th Aug 1930 | West Wittering \ U \ 2January1930-September1930 Scan252 | |
| The urgent need to improve the change gear position for the Phantom engine. | 22th Aug 1930 | West Wittering \ U \ 2January1930-September1930 Scan253 | |
| Progress of an experiment fitting a Salerni coupling to model 14-EX. | 23th Aug 1930 | West Wittering \ U \ 2January1930-September1930 Scan254 | |
| Confirming the dispatch of drawings for a twin carburetter for the Phantom chassis. | 23th Aug 1930 | West Wittering \ U \ 2January1930-September1930 Scan255 | |
| Comparative analysis of different cooling system radiator tube configurations and their performance. | 24th Aug 1929 | West Wittering \ U \ 2January1930-September1930 Scan256 | |
| The design and standardization of a K.S. petrol gauge tank fitting. | 26th Aug 1930 | West Wittering \ U \ 2January1930-September1930 Scan257 | |
| Options for replacing the standard Klaxon horn, including sourcing from Bosch, Klaxon, or manufacturing in-house. | 26th Aug 1930 | West Wittering \ U \ 2January1930-September1930 Scan258 | |
| Screwing oil sump and filter sludge drain plugs directly into aluminium components. | 26th Aug 1930 | West Wittering \ U \ 2January1930-September1930 Scan259 | |
| Queries about radiator mounting and lubrication for the 24-EX 10,000 mile car. | 28th Aug 1930 | West Wittering \ U \ 2January1930-September1930 Scan260 | |
| Radiator water loss and the design of a square tube radiator for the Phantom II. | 31th Aug 1930 | West Wittering \ U \ 2January1930-September1930 Scan261 | |
| Radiator design, bonnet ventilation, and improving bonnet louvres and locks. | 31th Aug 1930 | West Wittering \ U \ 2January1930-September1930 Scan262 | |
| Radiator shutter friction, rejecting a spring solution in favour of modifying the lower bearing design. | 31th Aug 1930 | West Wittering \ U \ 2January1930-September1930 Scan263 | |
| Outlining a scheme for a new radiator using a spring-loaded valve and short nozzles to prevent water loss. | 31th Aug 1930 | West Wittering \ U \ 2January1930-September1930 Scan264 | |
| Document LeC. 2816, showing an induction pipe and hot spot for a twin carburetter. | 31th Aug 1930 | West Wittering \ U \ 2January1930-September1930 Scan265 | |
| Future of compression ignition engines, specifically comparing 2-cycle and 4-cycle designs. | 31th Aug 1930 | West Wittering \ U \ 2January1930-September1930 Scan266 | |
| Single sleeve two-cycle and four-cycle engine designs, referencing Ricardo's work and the development of new cylinder models. | 1st Sep 1930 | West Wittering \ U \ 2January1930-September1930 Scan267 | |
| Listing textual alterations for a previous memo concerning the Phantom II. | 1st Sep 1930 | West Wittering \ U \ 2January1930-September1930 Scan268 | |
| Summary comparing different change gear (gearbox) schemes, focusing on silence and ease of use. | 1st Sep 1930 | West Wittering \ U \ 2January1930-September1930 Scan269 | |
| Comparing freewheel, jaw clutch, and synchro-mesh gearbox designs from various automotive manufacturers. | 2nd Sep 1930 | West Wittering \ U \ 2January1930-September1930 Scan270 | |
| Oil leakage from the back of 20/25 and 40/50 gearboxes and the correct placement of a drain hole. | 2nd Sep 1930 | West Wittering \ U \ 2January1930-September1930 Scan271 | |
| Failures in chromium plating and suggesting a more reliable and cost-effective method using a nickel undercoat. | 4th Sep 1930 | West Wittering \ U \ 2January1930-September1930 Scan272 | |
| Modifications to the radiator shutters and bottom bearings for the 20/25HP model. | 6th Sep 1930 | West Wittering \ U \ 2January1930-September1930 Scan273 | |
| Use of 'Air Maze' gauze screens as air filters for cars intended for Australia and India. | 9th Sep 1930 | West Wittering \ U \ 2January1930-September1930 Scan274 | |
| Instructions to modify the 20/25HP propeller shaft to address vibration issues by increasing its diameter and theoretical whirling speed. | 11th Sep 1930 | West Wittering \ U \ 2January1930-September1930 Scan275 | |
| The design of thermostatically controlled shutters, rejecting the use of springs. | 15th Sep 1930 | West Wittering \ U \ 2January1930-September1930 Scan276 | |
| Design requirements for thermostatically controlled radiator shutters and associated cooling system improvements. | 16th Sep 1930 | West Wittering \ U \ 2January1930-September1930 Scan277 | |
| Confirming the completion of design work for twin carburetter controls with the dispatch of associated documents. | 17th Sep 1930 | West Wittering \ U \ 2January1930-September1930 Scan278 | |
| Increase in hand brake lever movement for a left-hand chassis. | 17th Sep 1930 | West Wittering \ U \ 2January1930-September1930 Scan279 | |
| Reasons and features for developing a new head for the 'Japan' engine. | 20th Sep 1930 | West Wittering \ U \ 2January1930-September1930 Scan280 | |
| Requesting information on the increased cooling value of the Anderton Brown tube for radiators. | 20th Sep 1930 | West Wittering \ U \ 2January1930-September1930 Scan281 | |
| Design and progress of a two-way foot switch for a central lamp scheme. | 20th Sep 1930 | West Wittering \ U \ 2January1930-September1930 Scan282 | |
| Design and progress of a two-way foot switch for the central lamp scheme. | 20th Sep 1930 | West Wittering \ U \ 2January1930-September1930 Scan283 | |
| Radiator shutter friction and a proposed modification to the thermostat linkage. | 20th Sep 1930 | West Wittering \ U \ 2January1930-September1930 Scan284 | |
| Experimental modification to the Phantom clutch plate to reduce its weight. | 23th Sep 1930 | West Wittering \ U \ 2January1930-September1930 Scan285 | |
| Arrangement of epicyclic trains for a 25HP gearbox for testing purposes. | 25th Sep 1930 | West Wittering \ U \ 2January1930-September1930 Scan286 | |
| From 'R' proposing a shared-use car in France for trials, exhibition, and personal use to reduce costs. | 26th Sep 1930 | West Wittering \ U \ 2January1930-September1930 Scan287 | |
| Requesting a set of new Marchel headlamps for testing and comparing bulb amperage against French and German lamps. | 26th Sep 1930 | West Wittering \ U \ 2January1930-September1930 Scan288 | |
| Specifications for building a replica of the 26-EX experimental car. | 26th Sep 1930 | West Wittering \ U \ 2January1930-September1930 Scan289 | |
| Decision not to retain a Quadruplex pump due to concerns about wear from grit and sand. | 27th Sep 1930 | West Wittering \ U \ 2January1930-September1930 Scan290 | |
| Suggesting an investigation into matching the thermal expansion coefficients of aluminium and steel alloys for aero engine components. | 29th Sep 1930 | West Wittering \ U \ 2January1930-September1930 Scan291 | |
| Improvements and the standardisation of the radiator and cooling system for the P.2 & 25HP models. | 29th Sep 1930 | West Wittering \ U \ 2January1930-September1930 Scan292 | |
| The testing of a new speedometer at Brooklands, detailing its accuracy and the effects of tyre diameter. | 14th Aug 1930 | West Wittering \ U \ August1930-November1930 Scan001 | |
| Continued report on speedometer testing, comparing American cars to the company's own. | 4th May 1930 | West Wittering \ U \ August1930-November1930 Scan002 | |
| Correspondence regarding the development and testing of an experimental K.S. petrol gauge unit. | 4th Aug 1930 | West Wittering \ U \ August1930-November1930 Scan003 | |
| Testing a centrally vented petrol tank and dashboard gauge unit under pressure. | 4th Aug 1930 | West Wittering \ U \ August1930-November1930 Scan004 | |
| Page outlining requirements for a tank unit's positioning and venting arrangements. | 4th Aug 1930 | West Wittering \ U \ August1930-November1930 Scan005 | |
| The successful 11,000-mile test of a push button switch without carbon contacts, recommending its standardisation. | 8th Aug 1930 | West Wittering \ U \ August1930-November1930 Scan006 | |
| Test report on the friction horsepower and mechanical efficiency of a Phantom II engine. | 18th Aug 1930 | West Wittering \ U \ August1930-November1930 Scan007 | |
| Engagement tests for the Phantom II sequence starter, specifically the sharp-edged motor pinion and flywheel gear. | 20th Aug 1930 | West Wittering \ U \ August1930-November1930 Scan008 | |
| Test report on a motor and crankshaft rig, detailing various operational trials and their outcomes. | 20th Aug 1930 | West Wittering \ U \ August1930-November1930 Scan009 | |
| Test report detailing the results of engagement and endurance tests on a gear mechanism under varying voltage conditions. | 20th Aug 1930 | West Wittering \ U \ August1930-November1930 Scan010 | |
| Test report page detailing pinion and gear engagement performance and attributing burring to a high voltage test. | 20th Aug 1930 | West Wittering \ U \ August1930-November1930 Scan011 | |
| Report recommending hardening flywheel gear teeth to reduce burring and chipping, based on preliminary test results. | 20th Aug 1930 | West Wittering \ U \ August1930-November1930 Scan012 | |
| Reverting to 5 or 10 degree helical teeth and the potential impact on the main control spring. | 1st Aug 1930 | West Wittering \ U \ August1930-November1930 Scan013 | |
| The fourth series of Brooklands tests comparing radiator and cooling system performance. | 21th Aug 1930 | West Wittering \ U \ August1930-November1930 Scan014 | |
| Radiator matrix performance, cooling efficiency, and the effects of bonnet ventilation at various speeds. | 21th Aug 1930 | West Wittering \ U \ August1930-November1930 Scan015 | |
| Improving engine cooling system efficiency through various modifications. | 21th Aug 1930 | West Wittering \ U \ August1930-November1930 Scan016 | |
| Analysis of gear ratio, ignition, and cooling performance, with a comparison to Chrysler and plans for further tests. | 21th Aug 1930 | West Wittering \ U \ August1930-November1930 Scan017 | |
| Page from a test report outlining the conditions for testing, including shutter settings, fan modifications, gear ratios, and car load. | 28th Feb 1921 | West Wittering \ U \ August1930-November1930 Scan018 | |
| Test report table showing radiator temperatures under various bonnet ventilation and fan belt conditions. | 28th Feb 1921 | West Wittering \ U \ August1930-November1930 Scan019 | |
| Table comparing radiator performance and specifications under various bonnet ventilation and fan configurations. | 28th Feb 1921 | West Wittering \ U \ August1930-November1930 Scan020 | |
| Test report detailing the effect of various car alterations on top water temperature. | 28th Feb 1921 | West Wittering \ U \ August1930-November1930 Scan021 | |
| Full throttle test results comparing top water temperatures for different vehicle configurations and speeds. | 28th Feb 1921 | West Wittering \ U \ August1930-November1930 Scan022 | |
| Comparison of cooling system performance between a Chrysler and a Rolls-Royce Phantom II under various speed and throttle conditions. | 22th Apr 1931 | West Wittering \ U \ August1930-November1930 Scan023 | |
| Comparative vehicle cooling tests at Brooklands, comparing a Phantom II with five other cars. | 22th Apr 1931 | West Wittering \ U \ August1930-November1930 Scan024 | |
| Comparison of cooling system volumes and performance against competitor vehicles like Pierce Arrow and Graham Paige. | 25th Aug 1931 | West Wittering \ U \ August1930-November1930 Scan025 | |
| Report comparing 25 HP and 30 HP cars, with maximum speed test results for various models and chassis. | 25th Aug 1930 | West Wittering \ U \ August1930-November1930 Scan026 | |
| Comparative table of radiator face area, volume, and on-track temperature for various car models. | 26th Aug 1930 | West Wittering \ U \ August1930-November1930 Scan027 | |
| Comparative graphs of acceleration figures and speedometer calibrations for various vehicles. | 26th Aug 1930 | West Wittering \ U \ August1930-November1930 Scan028 | |
| Comparative chart of technical specifications and performance data for various American and Rolls-Royce cars. | 26th Aug 1930 | West Wittering \ U \ August1930-November1930 Scan029 | |
| Bench tests of thermostat radiator shutters to investigate operational lag and hysteresis loss. | 26th Aug 1930 | West Wittering \ U \ August1930-November1930 Scan030 | |
| Shutter friction losses, comparing the effort required and operating temperatures for different shutter types. | 26th Aug 1930 | West Wittering \ U \ August1930-November1930 Scan031 | |
| The performance of thermostat-controlled radiator shutters and recommendations for improvement. | 26th Aug 1930 | West Wittering \ U \ August1930-November1930 Scan032 | |
| Drawing showing the suggested location of a large Smithermet component. | 19th Aug 1930 | West Wittering \ U \ August1930-November1930 Scan033 | |
| 40/50 clutch tests comparing the burnout resistance of a new fabric-lined clutch with a standard one. | 30th Aug 1930 | West Wittering \ U \ August1930-November1930 Scan034 | |
| Spring inter-leaving material and issues with clutch performance compared to American standards. | 31th May 1931 | West Wittering \ U \ August1930-November1930 Scan035 | |
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