| Description | Date | Identifier | |
| Testing Chrysler and Rolls-Royce balance weight schemes to eliminate flywheel vibration on a 25 HP engine. | 1st Sep 1931 | Box 181 \ M9 img008 | |
| Bench tests and modifications for improved performance on a 25 HP engine. | 5th Aug 1931 | Box 181 \ M9 img009 | |
| Vehicle performance, component testing, and achieved speeds on a track. | 5th Aug 1931 | Box 181 \ M9 img010 | |
| Graph showing engine performance tests conducted at Brooklands in August 1931. | 1st Aug 1931 | Box 181 \ M9 img011 | |
| Graph comparing Brake Horsepower vs RPM for five different exhaust system configurations. | 11th Aug 1931 | Box 181 \ M9 img012 | |
| Brooklands test results for a 12 G IV Close Coupled Four Seater car, comparing performance with different configurations. | 14th Aug 1931 | Box 181 \ M9 img013 | |
| Potential improvements to the 25 HP car to increase performance and smoothness. | 5th Aug 1931 | Box 181 \ M9 img014 | |
| Design of rivetless bonnet hinges, with reference to practices by Morris and Armstrong Siddeley. | 22th Jun 1931 | Box 181 \ M9 img015 | |
| Scheme to eliminate rear brake groans and squeaks by using an anti-squeak type shoe. | 9th Jun 1931 | Box 181 \ M9 img016 | |
| Performance tests conducted at Brooklands on three cars to compare speed and acceleration. | 23th Jun 1931 | Box 181 \ M9 img017 | |
| Performance comparison report on test vehicles, analyzing top speeds and acceleration with different engine and body configurations. | 23th Jun 1931 | Box 181 \ M9 img018 | |
| Road test report comparing a vehicle's performance with a Buick, noting acceleration, smoothness, and handling issues. | 23th Jun 1931 | Box 181 \ M9 img019 | |
| Graph comparing road wheel horsepower against engine RPM from Brooklands and China unit tests. | 19th Jun 1931 | Box 181 \ M9 img020 | |
| Graph from Brooklands tests showing engine performance curves for Clutch HP and B.M.E.P. | 19th Jun 1931 | Box 181 \ M9 img021 | |
| Blueprint graph comparing engine performance for two configurations from Brooklands tests, plotting BHP and BMEP against RPM. | 19th Jun 1931 | Box 181 \ M9 img022 | |
| Technical memorandum discussing timing and camshaft tests for the R-engine. | 24th Jun 1931 | Box 181 \ M9 img023 | |
| Camshaft alterations and their effects on engine performance, including valve timing and lift. | 24th Jun 1931 | Box 181 \ M9 img024 | |
| Experiments on various carburetter arrangements for a car engine. | 11th Jul 1931 | Box 181 \ M9 img025 | |
| Technical comparison of Claudel and Zenith carburetter systems and arrangements. | 11th Jul 1931 | Box 181 \ M9 img026 | |
| The characteristics of S.U. carburettors, their performance, and a comparison with Bentley induction systems. | 11th Jul 1931 | Box 181 \ M9 img027 | |
| Performance comparison graph of various carburettor arrangements on a PII engine with an aluminium head. | 10th Jul 1931 | Box 181 \ M9 img028 | |
| Performance graph comparing two different carburettor arrangements (Claudel and Zenith) for a 25 HP engine. | 10th Jul 1931 | Box 181 \ M9 img029 | |
| Alternative designs and materials for rivetless bonnets, comparing aluminium to steel. | 15th Jul 1931 | Box 181 \ M9 img030 | |
| Quarterly complaints report detailing various issues with vehicle braking systems. | 29th Jul 1931 | Box 181 \ M9 img031 | |
| Ongoing issues and resolutions for various vehicle components including shock absorbers, springing, and exhausts. | 29th Jul 1931 | Box 181 \ M9 img032 | |
| Recurring complaints and modifications for various vehicle components. | 29th Jul 1931 | Box 181 \ M9 img033 | |
| Fixes and improvements for various vehicle components, including the rear axle, telegauge, and starter motor. | 29th Jul 1931 | Box 181 \ M9 img034 | |
| Faults and their remedies for various vehicle components, including the oil pump, engine, dynamo, and lubrication system. | 29th Jul 1931 | Box 181 \ M9 img035 | |
| List of modifications and improvements made to address various component complaints. | 29th Jul 1931 | Box 181 \ M9 img036 | |
| Updates on a water pump fabric drive and a solution for engine water leaks from cylinders. | 4th Aug 1931 | Box 181 \ M9 img037 | |
| Proposal to conduct wind tunnel experiments to reduce windage and improve the aerodynamics of car bodies. | 4th Aug 1931 | Box 181 \ M9 img038 | |
| Suggestion to sketch and test alternative car body shapes, referencing similar work done in America. | 14th Aug 1931 | Box 181 \ M9 img039 | |
| Analysis of three instances of spring plate failures in a low inertia damper. | 24th Aug 1931 | Box 181 \ M9 img040 | |
| Analysis and composition of Price's and Wakefield's lubricating oils. | 24th Aug 1931 | Box 181 \ M9 img041 | |
| The examination and composition of two oil samples, labelled 'A' and 'B'. | 22th Feb 1926 | Box 181 \ M9 img042 | |
| Report comparing two oil samples, 'A' and 'B', after a heat test, measuring viscosity and asphalting bodies. | 24th Aug 1931 | Box 181 \ M9 img043 | |
| Design history and performance of the auto friction damper on the 40/50 model. | 24th Aug 1931 | Box 181 \ M9 img044 | |
| Quarterly complaint memo regarding cracked exhaust manifolds on Phantom I & 20 HP models and a request for testing modifications. | 22th Jul 1931 | Box 181 \ M9 img045 | |
| Quarterly complaints about cracked exhaust manifolds for models Phantom I & P.2. | 28th Jul 1931 | Box 181 \ M9 img046 | |
| Distribution and testing of experimental Phantom I and 20 HP exhaust manifolds. | 4th Sep 1931 | Box 181 \ M9 img047 | |
| Request for information and monthly progress reports on experimental modified exhaust manifolds for P.I. and 20 HP cars. | 2nd Oct 1931 | Box 181 \ M9 img048 | |
| Power output difference between balanced and unbalanced twin carburetters. | 2nd Oct 1931 | Box 181 \ M9 img049 | |
| Graph comparing the power output of balanced and unbalanced twin carburettors. | 2nd Oct 1931 | Box 181 \ M9 img050 | |
| Power output difference between balanced and unbalanced twin carburettors. | 2nd Oct 1931 | Box 181 \ M9 img051 | |
| Recommendations for updating the battery ignition system. | 14th Oct 1931 | Box 181 \ M9 img052 | |
| List of advantages for a primary coil, circular condenser, and contact breaker lever. | 15th Oct 1931 | Box 181 \ M9 img053 | |
| List of suggestions and observations for ignition system components including the distributor, insulated lever, governor, and contact breaker levers. | 5th Oct 1931 | Box 181 \ M9 img054 | |
| The Delco-Remy vacuum-operated automatic ignition advance system. | 5th Oct 1931 | Box 181 \ M9 img055 | |
| Road test report on a 1931 Chrysler 6 Cylinder and Morris Isis. | 27th Oct 1931 | Box 181 \ M9 img056 | |
| Performance analysis and review of a 20 HP Wizard 2610 cc car. | 30th Oct 1931 | Box 181 \ M9 img057 | |
| Contemporary automotive features including dashboards, batteries, lamp controls, and accessories. | 30th Oct 1931 | Box 181 \ M9 img058 | |
| Electrical equipment trends observed at the Olympia Motor Show, covering ignition, dynamos, horns, and instruments. | 30th Oct 1931 | Box 181 \ M9 img059 | |
| Dashboards, 24-volt batteries, lamp controls, and other electrical accessories for cars. | 1st Oct 1931 | Box 181 \ M9 img060 | |
| Interesting features from the 1931 Motor Show, focusing on engine mounting. | 31th Oct 1931 | Box 181 \ M9 img061 | |
| Technical report on gearbox and steering technologies, comparing competitor features like synchromesh and flexible shackles. | 31th Mar 1931 | Box 181 \ M9 img062 | |
| Report page detailing observations on competitors' car designs, focusing on flexible shackles, cooling systems, and radiator construction. | 31th Oct 1931 | Box 181 \ M9 img063 | |
| Competitor car features, focusing on brake drum construction and materials. | 31th Oct 1931 | Box 181 \ M9 img064 | |
| Brake drum material specifications, liner manufacturers, and developments in hydraulic dampers. | 31th Oct 1931 | Box 181 \ M9 img065 | |
| Report notes on ignition systems and induction pipe layouts, with a diagram of an intake manifold. | 31th Oct 1931 | Box 181 \ M9 img066 | |
| Brief test run of a Hillman Wizard '75' car, detailing its particulars and general impressions. | 2nd Oct 1931 | Box 181 \ M9 img067 | |
| Road performance test report comparing a competitor's car (Wizard 75) to a Rolls-Royce 25HP. | 31th Oct 1931 | Box 181 \ M9 img068 | |
| Performance comparison note between a 20/25 HP chassis and a Hillman Wizard. | 31th Oct 1931 | Box 181 \ M9 img069 | |
| Letter from Cadillac Motor Car Company discussing developments in propeller shaft assemblies. | 21th Oct 1931 | Box 181 \ M9 img070 | |
| Page discussing specifications for Oakland cars and Phantom II shafts, including balance and thickness. | 21th Oct 1931 | Box 181 \ M9 img071 | |
| Blueprint diagram illustrating the front and rear mounting of a Plymouth engine. | 21th Oct 1931 | Box 181 \ M9 img072 | |
| Blueprint comparing four different designs of flexible spring shackles used by various manufacturers. | 21th Oct 1931 | Box 181 \ M9 img073 | |
| Suggested scheme for the windings of an outside primary ignition coil. | 19th Oct 1931 | Box 181 \ M9 img074 | |
| Letter from Mechanics Universal Joint Company discussing the critical speeds of drive shaft tubes and providing a formula. | 19th Oct 1931 | Box 181 \ M9 img075 | |
| Effects of friction torsional vibration dampers on crankshaft critical speed and vibration period. | 7th Nov 1931 | Box 181 \ M9 img076 | |
| Recommending the purchase and evaluation of a small Fiat car for the 'Peregrine' class. | 13th Nov 1931 | Box 181 \ M9 img077 | |
| Technical assessment and test report of a 2.5 Litre Fiat Saloon. | 13th Nov 1931 | Box 181 \ M9 img078 | |
| Vehicle performance and handling report, comparing it to competitor models. | 13th Nov 1931 | Box 181 \ M9 img079 | |
| Design and criticisms of the Diamond engine mounting, considering a separate gearbox. | 16th Nov 1931 | Box 181 \ M9 img080 | |
| Results of tests on self-adjusting hydraulic shock absorbers. | 9th Nov 1931 | Box 181 \ M9 img081 | |
| Methodology and conditions for testing the movement of shock damper levers. | 9th Nov 1931 | Box 181 \ M9 img082 | |
| Test data table comparing rear damper performance at various speeds on two different road surfaces. | 21th Nov 1931 | Box 181 \ M9 img083 | |
| Comparing clutch spring loads and pedal pressures for the 25 HP and 40/50 models. | 21th Nov 1931 | Box 181 \ M9 img084 | |
| Fitting of a Bosch dynamo and comparing a third-brush machine with a voltage control generator. | 23th Nov 1931 | Box 181 \ M9 img085 | |
| Investigation into cross steering tube load, permanent set, and wear on ball pads. | 25th Nov 1931 | Box 181 \ M9 img086 | |
| Comparative test report on a 29 HP 8 Cylinder Chrysler, detailing its performance and characteristics. | 9th Feb 1931 | Box 181 \ M9 img087 | |
| Performance and handling review of a vehicle, comparing it to competitor models. | 23th Feb 1931 | Box 181 \ M9 img088 | |
| Testing Maybach cars and issues with fitting their clutches to a 14-MX car. | 23th Feb 1931 | Box 181 \ M9 img089 | |
| Test report on an 8-cylinder supercharged Mercedes from the 1931 Berlin Motor Show. | 9th Mar 1931 | Box 181 \ M9 img090 | |
| Bonnet ventilators, shock dampers, and central lubrication systems with accompanying diagrams. | 9th Mar 1931 | Box 181 \ M9 img091 | |
| Technical memo discussing carburettor silencers and a crude interior heating scheme with a diagram. | 3rd May 1931 | Box 181 \ M9 img092 | |
| Report detailing a road traffic accident involving car 39II. | 23th Mar 1923 | Box 181 \ M10 img001 | |
| Report detailing damage to a car after a collision with a tram car. | 8th Oct 1924 | Box 181 \ M10 img002 | |
| Itemised invoice for vehicle repairs due to wear and tear. | 8th Oct 1924 | Box 181 \ M10 img003 | |
| The examination of Chassis No. 38 P.K. after an accident, noting parts needing attention. | 10th Oct 1924 | Box 181 \ M10 img004 | |
| Letter regarding accident damage to Mr. Royce's Goshawk car in Paris and arrangements for its return. | 4th Jun 1923 | Box 181 \ M10 img005 | |
| Accident report for chassis 4-G-2 involving a collision with a 10-HP Citroen in France. | 4th Oct 1933 | Box 181 \ M10 img006 | |
| Accident involving Mr. Royce's Goshawk 4 car and arrangements for its transport to the Works. | 5th Jun 1923 | Box 181 \ M10 img007 | |
| Receiving a 4-Goshawk-11 car from France after repairs and proposing to fit a new engine unit. | 11th Jun 1923 | Box 181 \ M10 img008 | |
| Accident investigation report for chassis 2-Goshawk-11, detailing steering and suspension faults. | 6th Jul 1923 | Box 181 \ M10 img009 | |
| Cover note for a report of an accident involving a 3-Goshawk-11 car. | 13th Oct 1923 | Box 181 \ M10 img010 | |
| Accident report for car 35-PK detailing a collision with a lorry obscured by smoke from a roadside fire. | 18th Dec 1923 | Box 181 \ M10 img011 | |
| Accident involving a motor lorry on Crocker Hill. | 28th Aug 1931 | Box 181 \ M10 img012 | |
| Estimated cost of repairs for car 27-EX following an accident. | 28th Aug 1931 | Box 181 \ M10 img013 | |
| Letter concerning injuries sustained by the sender's son in a motor accident. | 3rd Oct 1932 | Box 181 \ M10 img014 | |
| Person's expected return to work. | 3rd Oct 1932 | Box 181 \ M10 img015 | |
| | | | |
