| Description | Date | Identifier | |
| Internal memorandum discussing the J.3 engine design, engine size, performance versus comfort, and material choices. | 13th Jun 1931 | Box 181 \ M13 \ M13.2 img065 | |
| Continued memorandum discussing the construction of a single cylinder unit. | 13th Jun 1931 | Box 181 \ M13 \ M13.2 img066 | |
| Analyzing the results of various carburetter arrangements on Phantom II and 25 HP engines. | 7th Jul 1931 | Box 181 \ M13 \ M13.2 img067 | |
| Engine tuning, discussing M.E.P., speed ranges, carburation, and cylinder head design. | 7th Jul 1931 | Box 181 \ M13 \ M13.2 img068 | |
| Engine performance, power curves, and ongoing development work for 'Japan' and 'China' engine models. | 1st Jul 1931 | Box 181 \ M13 \ M13.2 img069 | |
| Graph comparing the performance of four different carburettor arrangements on a Phantom II engine with a 4.9 C/R aluminium head. | 8th Jul 1931 | Box 181 \ M13 \ M13.2 img070 | |
| Flywheel vibration and gear rattle tests for the 25 HP engine. | 8th Jul 1931 | Box 181 \ M13 \ M13.2 img071 | |
| Expressing concern over the development and performance of the new 25 HP car, codenamed 'Japan'. | 1st Jul 1931 | Box 181 \ M13 \ M13.2 img072 | |
| Experiments with balance weights and flywheel vibrations on a 25 HP engine. | 22th Jul 1931 | Box 181 \ M13 \ M13.2 img073 | |
| Sketch of balance weights used on a 25 HP crankshaft. | 23th Jul 1931 | Box 181 \ M13 \ M13.2 img074 | |
| Performance graph showing power output versus RPM for a long duration camshaft on a China Unit engine. | 23th Jul 1931 | Box 181 \ M13 \ M13.2 img075 | |
| Performance graph showing the effect of increased valve lift on a Japan Engine. | 11th Aug 1931 | Box 181 \ M13 \ M13.2 img076 | |
| The completion of modifications and travel itinerary for car 19-GIV. | 11th Aug 1931 | Box 181 \ M13 \ M13.2 img077 | |
| Investigating coil ignition misfires and spark plug gap issues on the 20/25 HP chassis. | 3rd Aug 1931 | Box 181 \ M13 \ M13.2 img078 | |
| The comparative testing of various ignition coils against a standard and a new modified coil. | 13th Aug 1931 | Box 181 \ M13 \ M13.2 img079 | |
| Analysis of the advantages of different ignition coil designs and manufacturing methods. | 8th Aug 1931 | Box 181 \ M13 \ M13.2 img080 | |
| The choice of springs for the 25 HP model for France, balancing comfort against reliability and handling. | 17th Aug 1931 | Box 181 \ M13 \ M13.2 img081 | |
| The results of deflection tests on a 25 HP crankcase. | 19th Aug 1931 | Box 181 \ M13 \ M13.2 img082 | |
| Improved performance tests for the 25 HP model, including acceleration and hill climbing results. | 19th Aug 1931 | Box 181 \ M13 \ M13.2 img083 | |
| Low speed performance and acceleration test results for a close-coupled four-seater. | 15th Aug 1931 | Box 181 \ M13 \ M13.2 img084 | |
| Test report on 114° camshafts, comparing power curves and valve timing. | 26th Aug 1931 | Box 181 \ M13 \ M13.2 img085 | |
| Tests to determine the effect of the amount and position of balance weights on flywheel vibration. | 27th Aug 1931 | Box 181 \ M13 \ M13.2 img086 | |
| Blueprint showing three numbered abstract line diagrams. | 27th Aug 1931 | Box 181 \ M13 \ M13.2 img087 | |
| Harmonic balancers on American engines and their potential application on a 'China' engine. | 27th Aug 1931 | Box 181 \ M13 \ M13.2 img088 | |
| Test results and modifications for an improved 25 HP car tested at Brooklands. | 29th Aug 1931 | Box 181 \ M13 \ M13.2 img089 | |
| Performance chart comparing lap speeds for a 25 HP car with various modifications at Brooklands Track. | 26th Aug 1931 | Box 181 \ M13 \ M13.2 img090 | |
| Bar chart comparing the high-speed performance of a 25 HP car with different engine and axle configurations at Brooklands track. | 26th Aug 1931 | Box 181 \ M13 \ M13.2 img091 | |
| Experiments conducted on the 25 HP car to improve smoothness and reduce vibration. | 29th Aug 1931 | Box 181 \ M13 \ M13.2 img092 | |
| Recommending Wakefields Gearease No.1 as an alternative oil for hypoid rear axles following successful testing. | 1st Sep 1931 | Box 181 \ M13 \ M13.2 img093 | |
| Comments on a report detailing various mechanical issues and proposed modifications for a 25 HP car after 8,000 miles. | 15th Sep 1931 | Box 181 \ M13 \ M13.2 img094 | |
| Front engine suspension and a query about clutch lubrication. | 23th Sep 1931 | Box 181 \ M13 \ M13.2 img095 | |
| Comments on criticisms from a report on a 25 HP car after 8,000 miles, addressing various mechanical issues. | 15th Sep 1931 | Box 181 \ M13 \ M13.2 img096 | |
| Investigations into power output variations between different 'Japan' cylinder heads and alterations made to them. | 16th Sep 1931 | Box 181 \ M13 \ M13.2 img097 | |
| Phantom II cooling tests, specifically air temperature rise through the radiator and bonnet ventilation. | 7th Sep 1931 | Box 181 \ M13 \ M13.2 img098 | |
| The performance of a 25 HP synchro mesh gearbox, including a comparison with a Buick. | 22th Sep 1931 | Box 181 \ M13 \ M13.2 img099 | |
| Summary of tests on 'Japan' concerning power output, detailing adjustments to valve timing, carburettors, and manifold capacity. | 24th Sep 1931 | Box 181 \ M13 \ M13.2 img100 | |
| Continued report on various engine component tests including induction pipes, carburettors, and valves. | 24th Sep 1931 | Box 181 \ M13 \ M13.2 img101 | |
| Performance comparison graph for three different carburetter configurations, plotting B.H.P and B.M.E.P against R.P.M. | 19th Aug 1931 | Box 181 \ M13 \ M13.2 img102 | |
| Performance graph and specifications for the 'Japan Unit' engine. | 18th Sep 1931 | Box 181 \ M13 \ M13.2 img103 | |
| Graph comparing the performance of four different carburetter arrangements on a Japan Unit engine. | 18th Sep 1931 | Box 181 \ M13 \ M13.2 img104 | |
| Performance graph showing Brake Horse Power vs RPM for an engine with twin carburettors, detailing the effect of increasing induction. | 23th Sep 1931 | Box 181 \ M13 \ M13.2 img105 | |
| Performance graph comparing timing alterations on a 112° camshaft with two Claudel carburettors. | 23th Sep 1931 | Box 181 \ M13 \ M13.2 img106 | |
| Performance graph comparing different induction pipe capacities for the 'Japan Unit'. | 23th May 1931 | Box 181 \ M13 \ M13.2 img107 | |
| Performance comparison graph for single versus double Claudel carburetors. | 23th May 1931 | Box 181 \ M13 \ M13.2 img108 | |
| Proposed improvements for the 25 HP car, based on testing and competitive analysis. | 1st Oct 1931 | Box 181 \ M13 \ M13.2 img109 | |
| Low performance of the 25 HP model and the urgency of implementing improvements. | 2nd Oct 1931 | Box 181 \ M13 \ M13.2 img110 | |
| Correcting a previous report on power output, specifically regarding induction pipe depression units. | 2nd Oct 1931 | Box 181 \ M13 \ M13.2 img111 | |
| Dynamometer test of a 25 HP synchro mesh gearbox. | 3rd Oct 1931 | Box 181 \ M13 \ M13.2 img112 | |
| Performance graph comparing high and low lift rockers for a single carburettor Japan unit. | 6th Oct 1931 | Box 181 \ M13 \ M13.2 img113 | |
| Case of engine overheating in a 25 HP model caused by blocked water passages in the cylinder block. | 6th Oct 1931 | Box 181 \ M13 \ M13.2 img114 | |
| 25 HP engine roughness and tests on a thin flange flywheel with Chrysler balance weights. | 5th Oct 1931 | Box 181 \ M13 \ M13.2 img115 | |
| List of comments on failures observed during a 161,000-mile car test. | 7th Oct 1931 | Box 181 \ M13 \ M13.2 img116 | |
| Issues with battery ignition and exhaust valve failure, with proposed solutions. | 7th Oct 1931 | Box 181 \ M13 \ M13.2 img117 | |
| The 19.G.IV model at 15,000 miles, detailing performance comparisons and a list of failures. | 30th Sep 1931 | Box 181 \ M13 \ M13.2 img118 | |
| Claudel carburetter specifications for the P.2 model and performance of an S.U. carburetter on a 3 1/4 litre engine. | 1st Oct 1931 | Box 181 \ M13 \ M13.2 img119 | |
| Specifications of a Citroen car. | 2nd Oct 1931 | Box 181 \ M13 \ M13.2 img120 | |
| The delivery of a 20/25 HP dummy chassis and the fitting of a new, extended petrol tank. | 19th Oct 1931 | Box 181 \ M13 \ M13.2 img121 | |
| Flywheel vibration and balance weights for a 25 HP engine. | 19th Oct 1931 | Box 181 \ M13 \ M13.2 img122 | |
| Engine power output tests for a 10,000-mile car, focusing on a new camshaft, pistons, and various exhaust systems. | 27th Oct 1931 | Box 181 \ M13 \ M13.2 img123 | |
| Performance comparison graph between a CI Unit and a CXI Unit over 10,000 miles. | 29th Jun 1937 | Box 181 \ M13 \ M13.2 img124 | |
| Graph of power curves comparing various exhaust system configurations from a 10,000-mile test. | 25th Oct 1931 | Box 181 \ M13 \ M13.2 img125 | |
| Balance weight schemes for 25 HP crankshafts, including the Chrysler scheme and stock of forgings. | 27th Oct 1931 | Box 181 \ M13 \ M13.2 img126 | |
| The order of rims and instruments with Venetian cream dials for a 25 HP car. | 28th Oct 1931 | Box 181 \ M13 \ M13.2 img127 | |
| The solution to reverse gear issues in the 25 HP synchromesh gearbox by increasing shaft stiffness. | 11th Nov 1931 | Box 181 \ M13 \ M13.2 img128 | |
| The pedal pressure and load specifications for a 25 HP clutch. | 6th Nov 1931 | Box 181 \ M13 \ M13.2 img129 | |
| Blueprint diagram with calculations for clutch leverage and spring pressure. | 6th Nov 1931 | Box 181 \ M13 \ M13.2 img130 | |
| Difficulties with clutch stops during testing of a Japan III synchro mesh gearbox. | 6th Nov 1931 | Box 181 \ M13 \ M13.2 img131 | |
| Tests of induction pipe and carburettor configurations to improve fuel distribution and power output. | 17th Nov 1931 | Box 181 \ M13 \ M13.2 img132 | |
| Continued analysis of carburettor and inlet pipe performance, comparing J.1 and Bentley engine data. | 17th Nov 1931 | Box 181 \ M13 \ M13.2 img133 | |
| Close-up photograph of an engine with a carburettor and a measuring device attached. | 18th Nov 1931 | Box 181 \ M13 \ M13.2 img134 | |
| Maximum speed of 81 M.P.H. achieved by the 18-G4 car under favourable conditions. | 18th Nov 1931 | Box 181 \ M13 \ M13.2 img135 | |
| Performance graph showing the power output of the 'China Unit' engine with various configurations. | 21th Nov 1931 | Box 181 \ M13 \ M13.2 img136 | |
| Comparing the acceleration performance of car 18-GIV against car 14-GIV. | 21th Nov 1931 | Box 181 \ M13 \ M13.2 img137 | |
| Stress levels of a 25 HP valve spring and the trial of a new set. | 28th Nov 1931 | Box 181 \ M13 \ M13.2 img138 | |
| Blueprint detailing the specifications for a valve spring nicknamed 'China'. | 28th Nov 1931 | Box 181 \ M13 \ M13.2 img139 | |
| Tests to eliminate timing gear rattles on a 25 HP engine. | 30th Nov 1931 | Box 181 \ M13 \ M13.2 img140 | |
| Comparison table of different radiator models detailing their specifications. | 30th Nov 1931 | Box 181 \ M13 \ M13.2 img141 | |
| Publication of Goshawk II particulars, including instructions from Mr. Royce about patents and photographs. | 18th Sep 1922 | Box 182 \ M14 img001 | |
| Index page for the description of the Goshawk. | 18th Sep 1922 | Box 182 \ M14 img002 | |
| Introduction to the design, specifications, and limitations of the Goshawk chassis. | 18th Sep 1922 | Box 182 \ M14 img003 | |
| Condensed specification sheet for a vehicle chassis and powertrain. | 18th Sep 1922 | Box 182 \ M14 img004 | |
| Detailed description of the 6-cylinder engine's design and features. | 18th Sep 1922 | Box 182 \ M14 img005 | |
| The lubrication, carburation, and clutch systems. | 18th Sep 1922 | Box 182 \ M14 img006 | |
| Technical description of the gearbox and brake systems. | 18th Sep 1922 | Box 182 \ M14 img007 | |
| The design and construction of the back axle, front axle, and steering system. | 18th Sep 1922 | Box 182 \ M14 img008 | |
| Descriptive document detailing vehicle components such as steering, road springs, frame, and lubrication. | 18th Sep 1922 | Box 182 \ M14 img009 | |
| Specification sheet detailing the lubrication system, pedals, and instrument board layout. | 18th Sep 1922 | Box 182 \ M14 img010 | |
| Description of the instrument board switchbox and the vehicle's electrical system. | 18th Sep 1922 | Box 182 \ M14 img011 | |
| Technical description of the Dynamo, Spare Wheel, Shock Dampers, and Water Cooling System. | 18th Sep 1922 | Box 182 \ M14 img012 | |
| Specifications for the electrical and fuel systems. | 18th Sep 1922 | Box 182 \ M14 img013 | |
| Description of the car's petrol tank features and a recommendation for the standard straight-sided cord tyres. | 18th Sep 1922 | Box 182 \ M14 img014 | |
| Requesting a replacement bolt and plate for a spare wheel. | 25th Jul 1920 | Box 182 \ M15 img001 | |
| Postcard addressed to the Experimental Department in Derby, England. | 25th Jul 1920 | Box 182 \ M15 img002 | |
| Letter providing instructions for adding oil to a rear axle, investigating a potential leak and checking for noise. | 7th Jan 1920 | Box 182 \ M15 img003 | |
| Expense sheet for J H Maddocks detailing payments during travel in France. | 17th Mar 1920 | Box 182 \ M15 img004 | |
| Expense report for travel in France and England during March 1920. | 31th Mar 1920 | Box 182 \ M15 img005 | |
| Expense report for the week ending April 22nd, 1922, detailing payments in England and France. | 22th Apr 1922 | Box 182 \ M15 img006 | |
| Weekly expense sheet for travel in Paris, France, detailing payments and balance in hand. | 24th Jun 1922 | Box 182 \ M15 img007 | |
| Expense claim form for P.H. Maddocks for a week in Paris, France. | 1st Jul 1922 | Box 182 \ M15 img008 | |
| Expense report for a trip to Paris, France by J.H. Maddocks. | 8th Jul 1922 | Box 182 \ M15 img009 | |
| | | | |
