| Description | Date | Identifier | |
| Stamped by the Print Room in Derby. | 19th Jun 1931 | West Wittering \ W \ May1931-August1931 Scan068 | |
| Power and M.E.P. curves for camshafts on the Phantom II and 25 HP models, detailing changes to valve lift. | 22th Jun 1931 | West Wittering \ W \ May1931-August1931 Scan069 | |
| The design of a sylphon tube type remote control for hydraulic shock absorber valves. | 24th Jun 1931 | West Wittering \ W \ May1931-August1931 Scan070 | |
| Urgent request for a design of a side spare wheel carrier stay for cars with diamond engine mounting and over-hanging bonnets. | 25th Jun 1931 | West Wittering \ W \ May1931-August1931 Scan071 | |
| Requesting the return of the Experimental Department's 1931 expenses file. | 26th Jun 1931 | West Wittering \ W \ May1931-August1931 Scan072 | |
| Operation and construction modifications for 'Flip Flap' bonnet shutters. | 30th Jun 1931 | West Wittering \ W \ May1931-August1931 Scan073 | |
| Cover note attaching a copy of a report received from G.W. Hancock. | 6th Jul 1931 | West Wittering \ W \ May1931-August1931 Scan074 | |
| The optimal settings for torque reaction dampers and an investigation into engine detonations with different petrol types. | 4th Jul 1931 | West Wittering \ W \ May1931-August1931 Scan075 | |
| Dynamo performance and modifications to avoid overcharging batteries at high speeds. | 7th Mar 1931 | West Wittering \ W \ May1931-August1931 Scan076 | |
| Dynamo performance improvements by altering field windings and armatures. | 3rd Jul 1931 | West Wittering \ W \ May1931-August1931 Scan077 | |
| Blueprint graph showing Dynamo Output Speed Curves for different field windings related to the Phantom II. | 1st Jul 1931 | West Wittering \ W \ May1931-August1931 Scan078 | |
| Mostly blank page with a purple 'Print Room, Derby' stamp in the bottom right corner. | 3rd Jul 1931 | West Wittering \ W \ May1931-August1931 Scan079 | |
| Results of comparative tests on different radiator tube sizes and the effect of bonnet shutters on cooling. | 18th Jul 1931 | West Wittering \ W \ May1931-August1931 Scan080 | |
| The standardisation of adjustable pedals for the P.2 'OZ' Series and the lack of a design for the 20/25 HP. | 20th Jul 1931 | West Wittering \ W \ May1931-August1931 Scan081 | |
| Summary of minor troubles identified during a 10,000-mile test in France, focusing on exhaust valves and shock absorbers. | 1st Aug 1931 | West Wittering \ W \ May1931-August1931 Scan082 | |
| Issues and proposed solutions for steering, petrol pump vapour lock, suspension, and battery box. | 1st Aug 1931 | West Wittering \ W \ May1931-August1931 Scan083 | |
| Describing the 'Macrome' method of magnetically tempering steel. | 6th Aug 1931 | West Wittering \ W \ May1931-August1931 Scan084 | |
| 'Macrome' steel treatment, its success on valve springs, and plans for further testing on engine components. | 6th Aug 1931 | West Wittering \ W \ May1931-August1931 Scan085 | |
| Summary of tests on Phantom II radiators carried out in France, detailing temperature readings during a hill climb. | 7th Aug 1931 | West Wittering \ W \ May1931-August1931 Scan086 | |
| Summary of radiator tests showing critical atmospheric temperatures under various conditions. | 4th Sep 1931 | West Wittering \ W \ May1931-August1931 Scan087 | |
| Summary of radiator tests conducted in France, comparing small and large hexagon dented types under various conditions. | 7th Aug 1931 | West Wittering \ W \ May1931-August1931 Scan088 | |
| Calculations regarding balance weights for a 40/50 Phantom crankshaft. | 1st Aug 1931 | West Wittering \ W \ May1931-August1931 Scan089 | |
| Blueprint with calculations for a balance weight for model LeC 2925. | 1st Aug 1931 | West Wittering \ W \ May1931-August1931 Scan090 | |
| Cover note for a report on car 25-KX after completing a 10,000-mile test in France, noting it will continue to 15,000 miles. | 1st Aug 1931 | West Wittering \ W \ May1931-August1931 Scan091 | |
| 10,000-mile report on vehicle 25-EX, detailing engine performance, specifically issues with torque dampers, pistons, and valves. | 5th Aug 1931 | West Wittering \ W \ May1931-August1931 Scan092 | |
| The condition and performance of various engine components after testing. | 5th Aug 1931 | West Wittering \ W \ May1931-August1931 Scan093 | |
| Issues and modifications for a petrol pump, speedometer drive, and flywheel/clutch assembly. | 5th Aug 1931 | West Wittering \ W \ May1931-August1931 Scan094 | |
| Servo motor friction lining performance and failures of various exhaust system components. | 5th Aug 1931 | West Wittering \ W \ May1931-August1931 Scan095 | |
| Test report on radiator and bonnet modifications, focusing on cooling efficiency and bonnet knocking. | 5th Aug 1931 | West Wittering \ W \ May1931-August1931 Scan096 | |
| Modifications and performance of radiator mountings, brakes, axles, and steering systems. | 20th Apr 1931 | West Wittering \ W \ May1931-August1931 Scan097 | |
| Modifications to the steering column, and front and rear shock dampers. | 20th Apr 1931 | West Wittering \ W \ May1931-August1931 Scan098 | |
| Analysis and troubleshooting report on damper performance, oil loss, and component wear. | 20th Apr 1931 | West Wittering \ W \ May1931-August1931 Scan099 | |
| Pedal heat, front and rear road spring performance, and petrol pump fuel supply issues. | 20th Apr 1931 | West Wittering \ W \ May1931-August1931 Scan100 | |
| Faults with petrol leaks, the Bijur system, telegauge, battery suspension, distributor, and dynamo. | 20th Apr 1931 | West Wittering \ W \ May1931-August1931 Scan101 | |
| Vehicle condition and performance report detailing issues with the bodywork, alongside data on weight, consumption, and tyre mileage. | 11th Aug 1931 | West Wittering \ W \ May1931-August1931 Scan102 | |
| Blueprint for a Phantom II twin carburettor air silencer. | 11th Aug 1931 | West Wittering \ W \ May1931-August1931 Scan103 | |
| Drawings for the central radiator mounting and a test on the speedometer drive for the 25-EX model. | 19th Aug 1931 | West Wittering \ W \ May1931-August1931 Scan104 | |
| Issues with battery box arrangements, cantilever support tests, and component failures due to vibration. | 21th Aug 1931 | West Wittering \ W \ May1931-August1931 Scan105 | |
| Issues with single-line petrol gauges and comparing them to other alternatives. | 24th Aug 1931 | West Wittering \ W \ May1931-August1931 Scan106 | |
| Design reasons for the rear apron on the 20/25 HP model. | 25th Aug 1931 | West Wittering \ W \ May1931-August1931 Scan107 | |
| Production and design of a new rivetless bonnet, comparing it to other schematics. | 25th Aug 1931 | West Wittering \ W \ May1931-August1931 Scan108 | |
| Results of tests on three different armature windings for dynamos. | 28th Aug 1931 | West Wittering \ W \ May1931-August1931 Scan109 | |
| Continued investigation into armatures and series winding for headlamps. | 28th Aug 1931 | West Wittering \ W \ May1931-August1931 Scan110 | |
| Graph of dynamo ampere output curves against RPM, showing the effect of different armature slot sizes for a PII chassis. | 1st Dec 1930 | West Wittering \ W \ May1931-August1931 Scan111 | |
| Stamped, otherwise blank, two-page spread from an archive book. | 27th Aug 1931 | West Wittering \ W \ May1931-August1931 Scan112 | |
| Prints for 25 HP high lift rockers and pedestals to increase valve lift. | 29th Aug 1931 | West Wittering \ W \ May1931-August1931 Scan113 | |
| Explaining why a fitting for the 25 HP rear aprons was not completed in time for a car departing for France. | 31th Aug 1931 | West Wittering \ W \ May1931-August1931 Scan114 | |
| Design and construction of rivetless bonnets, specifically shutter placement and riveting. | 31th Aug 1931 | West Wittering \ W \ May1931-August1931 Scan115 | |
| Design and production issues with an Armstrong type bonnet and its side hinge. | 1st Aug 1931 | West Wittering \ W \ May1931-August1931 Scan116 | |
| Results of tests and subsequent production adoption for a modified speedometer drive. | 31th Aug 1931 | West Wittering \ W \ May1931-August1931 Scan117 | |
| Graph and data table showing the exhaust valve lift curve, including velocity, acceleration, and timing diagrams. | 12th Jun 1934 | West Wittering \ W \ September1931-November1931 Scan001 | |
| Clarifying the type of ignition coil used on a 25 HP car and the status of an experimental design. | 11th Sep 1931 | West Wittering \ W \ September1931-November1931 Scan002 | |
| Tests carried out on a dynamo auxiliary field winding. | 2nd Sep 1931 | West Wittering \ W \ September1931-November1931 Scan003 | |
| Modifying series windings to improve electrical output performance for headlamps and different driving conditions. | 2nd Sep 1931 | West Wittering \ W \ September1931-November1931 Scan004 | |
| Blueprint graph showing dynamo output speed curves and the effect of series winding excited by headlamp current. | 1st Sep 1931 | West Wittering \ W \ September1931-November1931 Scan005 | |
| Blank document page bearing a Print Room stamp from the Derby facility. | 2nd Sep 1931 | West Wittering \ W \ September1931-November1931 Scan006 | |
| Graph of output speed curves showing the effect of series winding excited by headlamp current. | 2nd Sep 1931 | West Wittering \ W \ September1931-November1931 Scan007 | |
| Mostly blank document page with a 'Print Room' stamp from Derby. | 3rd Sep 1931 | West Wittering \ W \ September1931-November1931 Scan008 | |
| 8,000-mile report on engine 19.G.IV, detailing performance and adjustments. | 11th Sep 1931 | West Wittering \ W \ September1931-November1931 Scan009 | |
| Performance and modifications of the flywheel, clutch, gearbox, servo motor, and exhaust fittings. | 11th Sep 1931 | West Wittering \ W \ September1931-November1931 Scan010 | |
| Exhaust manifold, exhaust silencer, and fan failures during mileage tests. | 11th Sep 1931 | West Wittering \ W \ September1931-November1931 Scan011 | |
| Performance and issues observed with the radiator, bonnet, and steering column during mileage testing. | 11th Sep 1931 | West Wittering \ W \ September1931-November1931 Scan012 | |
| Vehicle component performance, including issues with steering lubrication, a noisy axle, universal joint leaks and brake wear. | 11th Sep 1931 | West Wittering \ W \ September1931-November1931 Scan013 | |
| Inspection report detailing issues with the Bijur lubrication system and the condition of the front and rear road springs. | 11th Sep 1931 | West Wittering \ W \ September1931-November1931 Scan014 | |
| Various component failures and modifications including dampers, a telegauge, a Bijur tank, and a windscreen wiper. | 11th Sep 1931 | West Wittering \ W \ September1931-November1931 Scan015 | |
| Vehicle condition and performance report detailing issues and metrics for various components. | 15th Sep 1931 | West Wittering \ W \ September1931-November1931 Scan016 | |
| Possibility of reducing wheel diameter on the 25 HP model. | 15th Sep 1931 | West Wittering \ W \ September1931-November1931 Scan017 | |
| Cover note for prints and a letter from Messrs. Lodge Plugs Ltd. | 23th Sep 1931 | West Wittering \ W \ September1931-November1931 Scan018 | |
| Failures and proposing design changes for the battery ignition contact breaker lever. | 28th Sep 1931 | West Wittering \ W \ September1931-November1931 Scan019 | |
| Complaints with standard instrument board clocks and evaluating potential mechanical and electric replacements. | 28th Sep 1931 | West Wittering \ W \ September1931-November1931 Scan020 | |
| Recommendation to produce a sample batch of Boyce clocks for comparison with the manual wound time piece. | 28th Sep 1931 | West Wittering \ W \ September1931-November1931 Scan021 | |
| 25 HP thin flange flywheel and a request for a new design. | 2nd Oct 1931 | West Wittering \ W \ September1931-November1931 Scan022 | |
| Tests conducted on two HERTZMARK air compressors. | 3rd Oct 1931 | West Wittering \ W \ September1931-November1931 Scan023 | |
| Performance testing of two different sized air compressors. | 3rd Oct 1931 | West Wittering \ W \ September1931-November1931 Scan024 | |
| Blueprint showing two cross-section views of a Herzmark single stage AV compressor. | 3rd Oct 1931 | West Wittering \ W \ September1931-November1931 Scan025 | |
| Graph comparing pressure rise against time for two different sized Herzmark single-stage air compressors. | 30th Sep 1931 | West Wittering \ W \ September1931-November1931 Scan026 | |
| Page with a purple ink stamp from the Print Room in Derby. | 3rd Oct 1931 | West Wittering \ W \ September1931-November1931 Scan027 | |
| Analysis of 25 HP engine power output concerning increased valve lift and clearance. | 5th Oct 1931 | West Wittering \ W \ September1931-November1931 Scan028 | |
| Performance comparison chart of high and low lift rockers with twin Zenith carburettors. | 6th Oct 1931 | West Wittering \ W \ September1931-November1931 Scan029 | |
| Back-page or cover sheet with a date stamp from Derby. | 6th Oct 1931 | West Wittering \ W \ September1931-November1931 Scan030 | |
| Performance comparison of high and low lift rockers with ramming, using Claudel carburettors. | 6th Oct 1931 | West Wittering \ W \ September1931-November1931 Scan031 | |
| Performance graphs showing BHP and MEP vs RPM, detailing the effect of increasing clearance around the inlet valve. | 6th Oct 1931 | West Wittering \ W \ September1931-November1931 Scan032 | |
| Performance graph comparing BHP and BMEP against RPM for different inlet valve clearances and valve lifts. | 5th Oct 1931 | West Wittering \ W \ September1931-November1931 Scan033 | |
| Sketch showing modifications to a Japan cylinder head to give increased clearance around inlet valves. | 5th Oct 1931 | West Wittering \ W \ September1931-November1931 Scan034 | |
| Blank document with a 'Print Room' received stamp. | 5th Oct 1931 | West Wittering \ W \ September1931-November1931 Scan035 | |
| Cover memo for a report on 19-G4 after 15,000 miles of testing in France, including comments on failures. | 7th Oct 1931 | West Wittering \ W \ September1931-November1931 Scan036 | |
| The condition and performance of Engine Unit No. C.10 after 7,000 miles. | 7th Oct 1931 | West Wittering \ W \ September1931-November1931 Scan037 | |
| The performance and issues with the flywheel, clutch, gearbox, servo motor, and exhaust fittings. | 7th Oct 1931 | West Wittering \ W \ September1931-November1931 Scan038 | |
| Component issues including engine mounting, fan belt, radiator, and bonnet. | 7th Oct 1931 | West Wittering \ W \ September1931-November1931 Scan039 | |
| The performance and issues found with the steering, prop shaft, and rear axle over extended mileage. | 7th Oct 1931 | West Wittering \ W \ September1931-November1931 Scan040 | |
| Test report on the performance of rear brakes, front axle, and front road springs. | 7th Oct 1931 | West Wittering \ W \ September1931-November1931 Scan041 | |
| Examination report on road springs, shock dampers, and a telegauge after road testing. | 7th Oct 1931 | West Wittering \ W \ September1931-November1931 Scan042 | |
| Performance of various vehicle components including the Bijur tank, Lucas wiper, engine guards, aprons, and electrical systems. | 7th Oct 1931 | West Wittering \ W \ September1931-November1931 Scan043 | |
| Vehicle condition report detailing the starter motor, petrol tank, bodywork, performance statistics, and tyre mileage. | 9th Oct 1931 | West Wittering \ W \ September1931-November1931 Scan044 | |
| Effect of various carburettor choke sizes on the Phantom II engine. | 9th Oct 1931 | West Wittering \ W \ September1931-November1931 Scan045 | |
| Hydraulic dampers and replenishing pipes. | 9th Oct 1931 | West Wittering \ W \ September1931-November1931 Scan046 | |
| Testing of exhaust manifold modifications on customer vehicles. | 9th Oct 1931 | West Wittering \ W \ September1931-November1931 Scan047 | |
| Performance of an A.C. petrol pump and recommending the R.R. pump for better performance at low speeds. | 2nd Oct 1931 | West Wittering \ W \ September1931-November1931 Scan048 | |
| Work and testing being done on a petrol pump to achieve the required delivery. | 3rd Oct 1931 | West Wittering \ W \ September1931-November1931 Scan049 | |
| Suggestion to use a less expensive and more robust moving iron type ammeter for the chassis. | 14th Oct 1931 | West Wittering \ W \ September1931-November1931 Scan050 | |
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