| Description | Date | Identifier | |
| 'thud' from a loose cylinder block and a parts list, written over an upside-down typed memo. | 15th Jan 1925 | Box 183 \ M22 img072 | |
| The performance improvements of a 14/52 axle ratio. | 1st May 1921 | Box 183 \ M22 img073 | |
| Distributing horsepower curves for the standard 40/50 engine with high and low compression. | 1st May 1921 | Box 183 \ M22 img074 | |
| Performance graph displaying M.E.P. & Torque curves from Bench and Dynamometer tests. | 1st May 1921 | Box 183 \ M22 img075 | |
| Blueprint graph of engine performance curves showing Horse Power, Torque, and M.E.P. | 1st May 1921 | Box 183 \ M22 img077 | |
| Graph on blueprint paper showing performance data for different axle and tyre configurations against speed. | 1st May 1921 | Box 183 \ M22 img078 | |
| Blueprint graph showing performance curves for the 40/50 Chassis Engine against Revolutions Per Minute. | 5th May 1921 | Box 183 \ M22 img079 | |
| Graph titled 'Low Compression' plotting data against Revolutions Per Minute. | 5th May 1921 | Box 183 \ M22 img080 | |
| Comparative trial of the 1.EX car, fitted with a 14-tooth axle, against the standard open Trials car. | 24th Jun 1921 | Box 183 \ M22 img081 | |
| Comparable axle ratio tests conducted on car 1.EX at Brooklands. | 13th Sep 1922 | Box 183 \ M22 img082 | |
| Performance test results for car 1.EX with a 4-seater open touring body, comparing high and low compression engine configurations. | 13th Sep 1922 | Box 183 \ M22 img083 | |
| Performance test results for car 1.EX, a 4-seater open touring body, comparing high and low compression engine settings. | 13th Feb 1920 | Box 183 \ M22 img084 | |
| Criticisms and required modifications for the RE car for West Wittering. | 13th Feb 1920 | Box 183 \ M22 img085 | |
| Personal requirements and a list of modifications for a new car. | 21th May 1929 | Box 183 \ M22 img086 | |
| Modifications to magneto drives, oil retaining discs, tank fillers, and paint color preferences. | 9th Apr 1920 | Box 183 \ M22 img087 | |
| Extract of a memo listing modifications to be fitted to a car for West Wittering. | 19th Apr 1920 | Box 183 \ M22 img088 | |
| Proposal concerning the replacement of car 1.EX, discussing the supply of a new chassis and body, associated delays, and design considerations. | 1st Apr 1920 | Box 183 \ M22 img089 | |
| From 'R' to 'HS' regarding modifications to a personal car for West Wittering. | 6th May 1920 | Box 183 \ M22 img090 | |
| Fitting of a luggage grid and an analysis of rear leaf spring performance using different materials like Ferodo or brass. | 31th May 1920 | Box 183 \ M22 img091 | |
| Specific grey paint colour for chassis 6 EX. | 9th Jun 1920 | Box 183 \ M22 img092 | |
| Extract detailing a list of experimental parts fitted to the 6.EX Car. | 28th Jun 1920 | Box 183 \ M22 img093 | |
| Letter discussing the preference for wire wheels with straight-sided tyres over disc wheels for the 6 EX chassis, and opinions on paint colours. | 14th Jun 1920 | Box 183 \ M22 img094 | |
| Replacement and testing of low tension contact points for ignition systems. | 30th Jun 1920 | Box 183 \ M22 img095 | |
| 'R' requesting various departments to expedite experimental work on new chassis, engines, and electrical components. | 14th Jul 1920 | Box 183 \ M22 img096 | |
| First impressions and notes following an inspection of the 6 EX chassis. | 22th Jul 1920 | Box 183 \ M22 img097 | |
| Reviewing design aspects of a car's back axle, springs, body, and other components. | 17th Jul 1920 | Box 183 \ M22 img098 | |
| Dynamo and speedometer drive issues, and future seating proportions for the 'Buzzard' and 'Vulture' models. | 17th Jul 1920 | Box 183 \ M22 img099 | |
| Standardization of the earthed wiring scheme on the 6.EX car. | 20th Jul 1929 | Box 183 \ M22 img100 | |
| Standardizing earthed wiring systems, considering bulb types, customer modifications, and dynamo suppliers. | 20th Jul 1920 | Box 183 \ M22 img101 | |
| Suitable switches for the Smith Dynamo and details of a wiring fault investigation on a car. | 20th Jul 1920 | Box 183 \ M22 img102 | |
| Instructions regarding seating, screen, and a new instrument board design for chassis 6 EX with special reference to 'D' steering. | 1st Jul 1920 | Box 183 \ M22 img103 | |
| Bodywork modifications, seating arrangements, and blueprints for chassis 6 KX. | 21th Jul 1920 | Box 183 \ M22 img104 | |
| From R. to H.S. about arranging a meeting in Peterborough for chassis 6 EX and confirming a drawing has been sent to Derby. | 21th Jul 1920 | Box 183 \ M22 img105 | |
| Notes on matters arising from a visit to West Wittering, concerning the Switchbox, Battery, Starter, Primer, and Bodywork for chassis 6 EX. | 22th Jul 1920 | Box 183 \ M22 img106 | |
| Issues and improvements for bodywork, steering, wheels, and springs. | 22th Jul 1920 | Box 183 \ M22 img107 | |
| Design alterations for a side filler on a petrol tank and a new model for a distribution board. | 22th Jul 1920 | Box 183 \ M22 img108 | |
| Technical memo detailing notes from a visit on 1st July 1920 concerning chassis 6.EX, covering the switchbox, battery, starter, primer, and bodywork. | 1st Jul 1920 | Box 183 \ M22 img109 | |
| Technical memo discussing design and testing of bodywork, steering, wheels, and road springs. | 22th Jul 1920 | Box 183 \ M22 img110 | |
| Design changes for a petrol tank filler handle and a distribution board. | 22th Jul 1920 | Box 183 \ M22 img111 | |
| Instructions for the seat dimensions and features of a new Park-Ward body for chassis 6 EX. | 23th Jul 1920 | Box 183 \ M22 img112 | |
| Trial and potential adoption of Smith lighting dynamo equipment on experimental cars. | 24th Jul 1920 | Box 183 \ M22 img113 | |
| Discussion of three alternative electrical switchboard and wiring systems. | 24th Jul 1920 | Box 183 \ M22 img114 | |
| Arrangement with Messrs. Smith to proceed with the production and design of a switchbox. | 24th Jul 1920 | Box 183 \ M22 img115 | |
| Telegram from Royce to Hives and Clark regarding difficulties with an earth scheme for twelve-volt electrical equipment. | 26th Jul 1920 | Box 183 \ M22 img116 | |
| Instructions on the colour choice for the body and hood of car 6 EX. | 2nd Aug 1920 | Box 183 \ M22 img117 | |
| New instrument board for the 6 EX model, detailing three new features to meet sales and American requirements. | 3rd Sep 1920 | Box 183 \ M22 img118 | |
| Criticising the handling of electrical errors on car 6 EX and confirming new designs have been sent. | 6th Sep 1920 | Box 183 \ M22 img119 | |
| Arranging a chassis comparison and outlining future production modifications. | 8th Sep 1920 | Box 183 \ M22 img120 | |
| Letter discussing design specifications for a car body, including beading, windscreen, scuttle, and instrument board. | 21th Sep 1920 | Box 183 \ M22 img121 | |
| Querying dimensional differences for the brake lever position on various car chassis. | 25th Sep 1920 | Box 183 \ M22 img122 | |
| With a diagram regarding an alteration to a brake lever dimension for drawing Lec.1280. | 1st Sep 1920 | Box 183 \ M22 img123 | |
| Methods to achieve high petrol consumption (35-37 mpg) on a 40/50 chassis. | 30th Sep 1920 | Box 183 \ M22 img124 | |
| Factors affecting petrol consumption, including driving techniques and measurement methods. | 1st Sep 1920 | Box 183 \ M22 img125 | |
| Improvement of car consumption and maximum speed, and managing the sales department's perception of competitor performance. | 30th Sep 1920 | Box 183 \ M22 img126 | |
| Notes from a visit concerning the experimental Goshawk engine, including cylinder jackets and water pipes. | 5th Oct 1920 | Box 183 \ M22 img127 | |
| Issues and suggestions regarding the camshaft drive, valve gear, sparking plug positions, and fuel consumption on the 40/50 HP chassis. | 8th Oct 1920 | Box 183 \ M22 img128 | |
| Issues and potential improvements for the 40/50 HP chassis, including steering, shock dampers, and axle ratios. | 8th Oct 1920 | Box 183 \ M22 img129 | |
| Design decisions on components for the Buzzard model, armoured cars, and other vehicles. | 1st Oct 1920 | Box 183 \ M22 img130 | |
| Impulse starters versus hand magnetos for armoured cars and the design of an air pump for tyres. | 1st Oct 1920 | Box 183 \ M22 img131 | |
| Design and engagement mechanism of a hand starter for an engine. | 1st Oct 1920 | Box 183 \ M22 img132 | |
| The fuel consumption of a 40/50 HP chassis, tyre efficiency, and potential improvements. | 5th Oct 1920 | Box 183 \ M22 img133 | |
| Tests on petrol consumption for the 40/50 chassis and the 6.EX car. | 28th Oct 1920 | Box 183 \ M22 img134 | |
| Petrol consumption and mechanical efficiency tests conducted under various road and shop conditions. | 28th Oct 1920 | Box 183 \ M22 img135 | |
| Fuel consumption (M.P.G.) tests and driving techniques to improve economy. | 28th Oct 1920 | Box 183 \ M22 img136 | |
| Continued note discussing the reduction of transmission losses with thin oil and comparing fuel consumption rates. | 28th Oct 1920 | Box 183 \ M22 img137 | |
| Update on the 6.EX Car's body frame fitting by Park Wards and a list of new parts to be installed. | 13th Nov 1920 | Box 183 \ M22 img138 | |
| Troubleshooting of a faulty petrol level indicator that gives erratic readings and leaks fuel. | 2nd Feb 1921 | Box 183 \ M22 img139 | |
| Status report on car 6-EX, detailing issues with the petrol level indicator and required parts. | 2nd Feb 1921 | Box 183 \ M22 img140 | |
| Starting and slow running device issue on a 40/50 HP chassis, number 6 EX, detailing an explosion and proposed alterations. | 8th Jun 1921 | Box 183 \ M22 img141 | |
| The starting and slow running device for the 40/50 chassis, specifically discussing the throttle. | 9th Jun 1921 | Box 183 \ M22 img142 | |
| Memo discussing personnel dynamics and a critical assessment of vehicle design problems. | 18th Jan 1922 | Box 183 \ M22 img143 | |
| Testing the 6.EX car in France, design requirements, and a focus on reliability over production. | 18th Jan 1922 | Box 183 \ M22 img144 | |
| Testing of car 6EX in cold weather, reliability, and design modifications. | 13th Jan 1922 | Box 183 \ M22 img145 | |
| Proposing modifications for the 6.EX car and arranging its return to Derby from France. | 16th Jan 1922 | Box 183 \ M22 img146 | |
| From 'R.' to 'Hs.' regarding the preference for black upholstery and the method for producing a dark grey paint for an experimental car. | 19th Jul 1922 | Box 183 \ M22 img147 | |
| From Mr. Royce detailing build specifications for the 6EX chassis, including paint and upholstery. | 19th Jul 1922 | Box 183 \ M22 img148 | |
| Rationalisation of electrical equipment by using modified Goshawk components on the 40/50 chassis. | 1st Jun 1922 | Box 183 \ M22 img149 | |
| Vehicle junction boxes, wiring, and dual ignition systems for 40/50 models, comparing UK and Springfield configurations. | 1st Jun 1922 | Box 183 \ M22 img150 | |
| Adapting Goshawk electrical equipment for the 40/50 model and modifying the G.XX car. | 1st Jun 1922 | Box 183 \ M22 img151 | |
| Front and rear shock absorber selection for the 40/50 HP model, comparing them to those on the Goshawk. | 14th Sep 1922 | Box 183 \ M22 img152 | |
| Progress report on repairs and proposed electrical component fitting for car 6.EX following an accident. | 14th Sep 1922 | Box 183 \ M22 img153 | |
| The finishing and painting timeline for a car, including alternative finish options. | 22th Sep 1922 | Box 183 \ M22 img154 | |
| Improvements to the 40/50 chassis by fitting Goshawk electrical equipment and a vacuum tank fuel system. | 22th Sep 1922 | Box 183 \ M22 img155 | |
| The instrument board layout, ignition switch, magneto, and a larger generator for the 40/50 model. | 21th Sep 1922 | Box 183 \ M22 img156 | |
| Paint color selections for the 6.EX and No.4.Goshawk car models. | 21th Sep 1922 | Box 183 \ M22 img157 | |
| From R. to HS. regarding modifications to the 6.EX and 40/50 models, specifically avoiding the vapouriser scheme. | 9th Oct 1922 | Box 183 \ M22 img158 | |
| Pros and cons of a vapouriser scheme for the 40/50 chassis. | 1st Oct 1922 | Box 183 \ M22 img159 | |
| Continued discussion on the limitations of exhaust heated throttles and improvements via a vaporiser scheme. | 5th Oct 1922 | Box 183 \ M22 img160 | |
| Modifications to the 40/50 standard induction pipe to improve petrol distribution and prevent misfiring. | 5th Oct 1922 | Box 183 \ M22 img161 | |
| Testing a vaporizer scheme, discussing issues with boilers, pilot jets, and cold starting. | 5th Oct 1922 | Box 183 \ M22 img162 | |
| Recommendation based on road tests to continue with the exhaust heated throttle and not fit the vapouriser scheme. | 10th Nov 1922 | Box 183 \ M22 img163 | |
| Proposed repositioning of the central handbrake and gear change levers. | 10th Nov 1922 | Box 183 \ M22 img164 | |
| Typed report discussing observations on central lever arrangements and modifications to car 6.EX using Goshawk parts. | 10th Nov 1922 | Box 183 \ M22 img165 | |
| List of modifications for the 6.EX. car. | 10th Nov 1922 | Box 183 \ M22 img166 | |
| List of parts and modifications fitted to the 6.EX car. | 10th Nov 1922 | Box 183 \ M22 img167 | |
| List of modifications and specifications for a vehicle, continued from a previous page. | 14th Nov 1922 | Box 183 \ M22 img168 | |
| Standardisation sheets, noting Mr. Royce's rejection of a vaporiser scheme. | 14th Nov 1922 | Box 183 \ M22 img169 | |
| Design of an 18-inch steering wheel rim for the 40/50, 6.EX, and 'Seagull' models. | 16th Nov 1922 | Box 183 \ M22 img170 | |
| Explaining the inability to work on left-hand controls for the Goshawk due to being overloaded with modifications for the 40/50 model. | 16th Nov 1922 | Box 183 \ M22 img171 | |
| Review of the 40/50 car model, comparing it to the Goshawk chassis and recommending body styles suitable for owner and lady drivers. | 1st Dec 1922 | Box 183 \ M22 img172 | |
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