| Description | Date | Identifier | |
| List of parts to be fitted and their current status for experimental car development. | 18th Sep 1919 | Morton \ M11 img222 | |
| The conditions for a 10,000-mile test, comparing France and Great Britain, and necessary vehicle modifications. | 8th Sep 1919 | Morton \ M11 img223 | |
| Need to engage bodybuilders like Barkers for future experimental car bodies. | 8th Sep 1919 | Morton \ M11 img224 | |
| Issues and potential improvements for fabric clutches, with hand-drawn diagrams. | 11th Sep 1919 | Morton \ M11 img225 | |
| Postscript to a memo about improving a clutch's performance by injecting it with castor oil. | 23th Sep 1919 | Morton \ M11 img226 | |
| Design and specifications for a water temperature regulator for the 40/50 HP chassis. | 1st Sep 1919 | Morton \ M11 img227 | |
| Direct bypass system, requesting parts from America and confirming an order for thermostat units. | 1st Sep 1919 | Morton \ M11 img228 | |
| Mr. Royce's decision on having the long chassis over the 'A' steering. | 27th Sep 1919 | Morton \ M11 img229 | |
| Changes to the water temperature regulator pipe arrangement for the 40/50 HP chassis. | 27th Sep 1919 | Morton \ M11 img230 | |
| Continuation of a memo discussing an engine fitted with a water temperature control. | 27th Sep 1919 | Morton \ M11 img231 | |
| Problems with fitting Michelin disc wheels and comparing their weight to Dunlop wheels. | 23th Sep 1919 | Morton \ M11 img232 | |
| Comparison of weights between Michelin disc wheels and Dunlop detachable wire wheels for front and rear applications. | 23th Sep 1919 | Morton \ M11 img233 | |
| Inaccuracies, weight, and aesthetics of Michelin disc wheels compared to other types. | 1st Sep 1919 | Morton \ M11 img234 | |
| Corrosion issues with wheel covers and recommending continued testing of Michelin disc wheels as a superior alternative to wire wheels. | 1st Sep 1919 | Morton \ M11 img235 | |
| Comparison of trembler and non-trembler ignition systems based on road tests. | 26th Sep 1919 | Morton \ M11 img236 | |
| Advantages and performance of a new battery ignition system. | 2nd Oct 1919 | Morton \ M11 img237 | |
| Electrical wiring insulation, flexible armouring, and the use of tubing for conductors on a car chassis. | 1st Oct 1919 | Morton \ M11 img238 | |
| The colour-coding scheme for low tension conductors on the 40/50 HP Chassis. | 1st Oct 1919 | Morton \ M11 img239 | |
| Use of armouring on low tension wires, particularly for those leading to lamps. | 1st Oct 1919 | Morton \ M11 img240 | |
| Failures in the 40/50 radiator suspension during bumping tests and proposing a design modification. | 10th Oct 1919 | Morton \ M11 img241 | |
| Letter about transmission 'chunking' and slow running, exploring causes like premature ignition, electrostatic induction in wiring, and poor fuel quality. | 22th Oct 1919 | Morton \ M11 img242 | |
| Continued technical memo listing potential causes for engine misfiring and addressing a customer complaint. | 1st Oct 1919 | Morton \ M11 img243 | |
| Issues with trembler ignition at high speeds and the testing of a potential replacement. | 1st Oct 1919 | Morton \ M11 img244 | |
| The urgent need for a model switchbox for the 40/50 HP electrical system. | 22th Oct 1919 | Morton \ M11 img245 | |
| Notes on matters discussed during a visit of Messrs. Barrington and Hives to West Wittering on the 23rd of the month. | 24th Oct 1919 | Morton \ M11 img246 | |
| From E. to EH. detailing Mr. Royce's decisions on various automotive components. | 24th Oct 1919 | Morton \ M11 img247 | |
| Experiments for battery ignition and notes on torque reaction vibration. | 24th Oct 1919 | Morton \ M11 img248 | |
| Drawings and alterations for a starter motor on an American 40/50 HP chassis. | 28th Nov 1919 | Morton \ M11 img249 | |
| Telegram from Royce to Barrington Hives regarding an investigation into connecting rod vibrations. | 29th Oct 1919 | Morton \ M11 img250 | |
| Re-arranging ignition wiring on chassis 1 EX to improve slow running and comparing the R.R. coil to the Remy coil. | 31th Oct 1919 | Morton \ M11 img251 | |
| Diagrams showing various methods for routing and securing LT and HT wiring. | 1st Mar 1911 | Morton \ M11 img252 | |
| Cover letter for miscellaneous notes made during a visit on the 23rd October involving Mr. Hives and Mr. Royce. | 24th Nov 1919 | Morton \ M11 img253 | |
| Requested modifications for a steering box axle for further testing. | 1st Dec 1919 | Morton \ M11 img254 | |
| Letter from C.J. to R. regarding a board meeting about 3 and 4-speed gearboxes, requesting a statement on the engineering advantages and cost details. | 27th Nov 1923 | Morton \ M12 img001 | |
| Letter discussing falling Goshawk sales due to restrictions on body weight and size, and requests from coachbuilders to increase these limits. | 28th Nov 1923 | Morton \ M12 img002 | |
| Confidential letter from R to CJ discussing a board meeting, the Goshawk bodies, and pricing for the 20 HP car. | 30th Nov 1923 | Morton \ M12 img003 | |
| Extract from a memo from R. to CJ. regarding a Board Meeting clashing with a general election, and the matter of 3 or 4 speeds. | 30th Nov 1923 | Morton \ M12 img004 | |
| From R. to C.J. strongly opposing suggested increases in weight and dimensions for Goshawk bodies. | 30th Nov 1923 | Morton \ M12 img005 | |
| Letter concerning Mr. Royce's anger over a 3-speed gearbox and the scheduling of a Board Meeting. | 3rd Dec 1923 | Morton \ M12 img006 | |
| From CJ to the directors regarding the 3-speed versus 4-speed gearbox and Mr. Royce's involvement. | 4th Dec 1923 | Morton \ M12 img007 | |
| From C.J. to the Directors discussing an increase in Goshawk body length, chassis strengthening, and rescheduling a board meeting. | 1st Dec 1923 | Morton \ M12 img008 | |
| Letter from C.J. to Mr. Royce regarding the difficult decision to build a three-speed gearbox instead of a four-speed one. | 22th Nov 1923 | Morton \ M12 img009 | |
| Letter enclosing the apprenticeship documents of the sender's late father, Mr. Kenneth Clark, for placement in the Company Archives. | 25th Jul 1969 | Morton \ M13.1 img001 | |
| Series of handwritten notes about costly errors, a bump rig, and instructions for tuning. | 25th Jul 1969 | Morton \ M13.1 img002 | |
| Page two of a report on car performance, discussing chassis modifications and the trade-off between weight and features. | 28th Mar 1911 | Morton \ M13.1 img003 | |
| Instructing a change to piston ring design from new double rings back to the old single standard type. | 28th Mar 1911 | Morton \ M13.1 img004 | |
| From F.H. Royce to Claude Johnson regarding the creation of a drawing for axle strain tests. | 3rd Jul 1912 | Morton \ M13.1 img005 | |
| Testing methods for the heat treatment of front pivots, abandoning the Impact Test for the Arnold Test. | 16th Jan 1914 | Morton \ M13.1 img006 | |
| Potential purchase of a thread pitch measuring machine from the Cambridge Scientific Instrument Co. | 23th Feb 1914 | Morton \ M13.1 img007 | |
| Response to Monsieur Faroux's report on a car, discussing chassis weight, performance, and recommended modifications. | 17th Oct 1916 | Morton \ M13.1 img008 | |
| Policy and direction for aero engine design and manufacturing, comparing air-cooled and water-cooled engines. | 6th Jan 1920 | Morton \ M13.1 img009 | |
| Advising against designing an aero engine and chassis concurrently to avoid interruptions and manage workload. | 8th Jan 1920 | Morton \ M13.1 img010 | |
| Providing diagnostic advice for poor vehicle acceleration, focusing on mixture settings and ignition timing. | 3rd Sep 1920 | Morton \ M13.1 img011 | |
| Continued memorandum on engine performance troubleshooting, discussing ignition, compression, fuel, and external factors. | 3rd Sep 1920 | Morton \ M13.1 img012 | |
| Progress on front wheel brake arrangements, frame modifications and patenting. | 19th Aug 1922 | Morton \ M13.1 img013 | |
| On company policy advocating for simple, robust progress and persistence, avoiding over-complication and frequent changes in direction. | 15th Feb 1924 | Morton \ M13.1 img014 | |
| Causes of and solutions for fumes entering the car cabin. | 29th Mar 1924 | Morton \ M13.1 img015 | |
| Letter from 'R' requesting weekly progress reports on steering, brakes, and gearbox work. | 16th Jan 1924 | Morton \ M13.1 img016 | |
| Report on exhaust boom and engine vibration tests on a 25 HP model. | 8th Dec 1930 | Morton \ M13.2 img001 | |
| Investigation into the causes of over-run booms on the 25 HP Japan Engine (1V-G6). | 8th Dec 1930 | Morton \ M13.2 img002 | |
| Report analysing different exhaust system configurations and their effect on reducing engine boom noise. | 8th Dec 1930 | Morton \ M13.2 img003 | |
| The performance and standardisation of a two-rate charge switching scheme for the dynamo-battery system. | 9th Dec 1930 | Morton \ M13.2 img004 | |
| Analysis of the dynamo output and battery charging characteristics in relation to field resistance. | 9th Dec 1930 | Morton \ M13.2 img005 | |
| Standardizing the measurement of dynamo output curves by controlling temperature and voltage. | 9th Dec 1930 | Morton \ M13.2 img006 | |
| Dynamo and battery charging systems, comparing single and two-rate charge schemes. | 9th Dec 1930 | Morton \ M13.2 img007 | |
| Proposal for a lengthened dynamo unit, discussing technical modifications, cost implications, and attached performance curves. | 1st Dec 1930 | Morton \ M13.2 img008 | |
| Petrol consumption of a 20 HP model in relation to its thermostat setting and engine running temperature. | 16th Dec 1930 | Morton \ M13.2 img009 | |
| Misfiring issues in the 20/25 HP battery ignition system due to high compression and proposed solutions. | 7th Dec 1930 | Morton \ M13.2 img010 | |
| Sparking plug voltage tests carried out on various chassis. | 7th Dec 1930 | Morton \ M13.2 img011 | |
| Test results for plug voltage with varying plug gaps and water temperatures. | 17th Dec 1930 | Morton \ M13.2 img012 | |
| Ignition system tests, analyzing spark plug voltages and the performance of ignition coils. | 17th Dec 1930 | Morton \ M13.2 img013 | |
| Changes to ignition coil windings and spark plug gaps for 20/25 and 40/50 chassis models. | 17th Dec 1930 | Morton \ M13.2 img014 | |
| Experiments on flywheel vibrations in a 25 HP engine. | 24th Dec 1930 | Morton \ M13.2 img015 | |
| Comparison of the weights and water capacities of 25 HP radiators with large hexagonal-ended copper tubes. | 30th Nov 1931 | Morton \ M13.2 img016 | |
| Listing part numbers for ball thrust washers for bevel pinions on 'Fulstow' and 'Tyfoeld' models. | 30th Apr 1926 | Morton \ M13.2 img017 | |
| Modifications and speed trial results for a 25 HP car ordered by Lord Cholmondeley. | 14th Nov 1931 | Morton \ M13.2 img018 | |
| Development and testing of hydraulic shock absorbers controlled from the driver's seat. | 13th Jun 1931 | Morton \ M13.2 img019 | |
| Proposal for sourcing a complete instrument board for the 20/25 HP chassis from Messrs Smiths. | 23th Oct 1931 | Morton \ M13.2 img020 | |
| Implementation and market position of easy change synchro-mesh gearboxes. | 20th Oct 1931 | Morton \ M13.2 img021 | |
| Expressing concern over the development of a new epicyclic gearbox for the Phantom II. | 20th Oct 1931 | Morton \ M13.2 img022 | |
| The performance of Mulliner's bodywork on chassis 19-G4 after a 15,000-mile test run in France. | 14th Oct 1931 | Morton \ M13.2 img023 | |
| 20/25 HP chassis with a Brewster body and the use of dummy shutters to improve appearance. | 9th Jan 1931 | Morton \ M13.2 img024 | |
| Test results for a WW flywheel, comparing configurations with and without a tail bearing at different speeds. | 13th Jan 1933 | Morton \ M13.2 img025 | |
| 25 HP engine vibrations, analyzing a lightened flywheel and different tail-bearing configurations. | 13th Jan 1933 | Morton \ M13.2 img026 | |
| Cross-sectional diagram of a Mirror Holder and Tail Bearing for a 25 HP Flywheel. | 14th Jan 1931 | Morton \ M13.2 img027 | |
| Analysis comparing the 25 HP chassis weight against a Chrysler car, considering potential weight increases. | 14th Jan 1931 | Morton \ M13.2 img028 | |
| Review of design faults on the 25 HP car, specifically addressing issues with exhaust pipes and slipper wheels. | 26th Jan 1931 | Morton \ M13.2 img029 | |
| Engine vibrations, dynamo output, and ignition complaints for a six-cylinder car. | 26th Jan 1931 | Morton \ M13.2 img030 | |
| Carburetters, petrol pump, 25 HP riding quality, and starter motor design. | 26th Jan 1931 | Morton \ M13.2 img031 | |
| Proposing road spring specifications and discussing ride comfort for the Continental Touring 25 HP model. | 30th Jan 1931 | Morton \ M13.2 img032 | |
| Recommendations concerning the front axle control and shock absorber placement for the 'Japan' III model. | 2nd Feb 1931 | Morton \ M13.2 img033 | |
| Proposal and discussion on road spring specifications for a Special Touring 25 HP model. | 2nd Feb 1931 | Morton \ M13.2 img034 | |
| Forthcoming 6 cylinder, 4 litre Bentley car intended to compete with the 25 HP model. | 3rd Feb 1931 | Morton \ M13.2 img035 | |
| Summary of faults and troubles experienced on vehicle 18.G.IV, with proposed solutions for the 'JAPAN' III model. | 3rd Feb 1931 | Morton \ M13.2 img036 | |
| List of numbered faults, proposed modifications, and standardization issues for a vehicle. | 3rd Feb 1931 | Morton \ M13.2 img037 | |
| List of vehicle modifications and features, continued on page 3. | 11th Feb 1931 | Morton \ M13.2 img038 | |
| Mathematical investigation into the benefits of heavy crankshafts and stiff crankcases for the 25 HP engine. | 11th Feb 1931 | Morton \ M13.2 img039 | |
| Uncomfortable pneumatic rear seat cushion on the 25-EX with a Park Ward body and requesting a replacement. | 9th Feb 1931 | Morton \ M13.2 img040 | |
| Test results for 25 HP flywheel vibrations using a double bearing. | 11th Feb 1931 | Morton \ M13.2 img041 | |
| Drawing of a 25 HP double flywheel bearing. | 20th Apr 1931 | Morton \ M13.2 img042 | |
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