| Description | Date | Identifier | |
| Requesting a change to a tyre order due to Dunlop being unable to supply Magnum tyres. | 1st Apr 1919 | Box 81 \ 1 scan0154 | |
| Investigation into a steering complaint on the 2.EX model, comparing the effects of different wheel and tyre combinations. | 20th Feb 1920 | Box 81 \ 1 scan0155 | |
| Continued extract discussing springing and steering tests comparing Goodyear and Dunlop tyres. | 20th Feb 1920 | Box 81 \ 1 scan0156 | |
| Disadvantage of using Dunlop tyres on Michelin Disc Wheels during standardisation considerations. | 21th Apr 1920 | Box 81 \ 1 scan0157 | |
| Querying if chassis sent to America are supplied without tyres, with a reply confirming and noting a separate tyre failure. | 19th Apr 1920 | Box 81 \ 1 scan0158 | |
| From R. to C.J. regarding the use of Dunlop tyres on Michelin disc wheels and advocating for security bolts. | 15th Apr 1920 | Box 81 \ 1 scan0159 | |
| Compatibility issues between Dunlop tyres and Michelin disc wheels. | 9th Mar 1920 | Box 81 \ 1 scan0160 | |
| Visit from a Dunlop director concerning the supply of straight-sided tyres and wire wheels. | 26th Apr 1920 | Box 81 \ 1 scan0161 | |
| Investigating a potential credit claim for tyres returned to Dunlop Co for Chassis 81-TW. | 7th Jan 1921 | Box 81 \ 1 scan0162 | |
| The cost for a set of four tyres from Dunlop, Goodyear, and Goodrich. | 22th Feb 1921 | Box 81 \ 1 scan0163 | |
| Covering letter enclosing a circular and leaflet from Dunlop Rubber Co. Ltd. regarding pneumatic motor tyre loads and inflation pressures. | 26th Oct 1921 | Box 81 \ 1 scan0164 | |
| Copy of a letter from Dunlop Rubber Co. regarding pneumatic motor tyre loads and inflation pressures. | 15th Oct 1921 | Box 81 \ 1 scan0165 | |
| Nominal and actual sizes of Dunlop and Michelin tyres for the 40/50 HP chassis. | 29th Dec 1921 | Box 81 \ 1 scan0166 | |
| Various tyre specifications and their impact on vehicle gearing and hill-climbing performance. | 19th Jul 1917 | Box 81 \ 1 scan0167 | |
| The correct directional fitting of Dunlop tyres with traction tread and its effect on interchangeability. | 10th Oct 1922 | Box 81 \ 1 scan0168 | |
| Impracticability of directionally fitting Dunlop tyres with traction tread based on internal testing. | 11th Oct 1922 | Box 81 \ 1 scan0169 | |
| Failures with Dunlop wheels and tyres during testing on experimental cars in France. | 12th May 1924 | Box 81 \ 1 scan0170 | |
| Continuation of a document discussing the return of covers and supply of new tyres. | 21th Sep 1911 | Box 81 \ 1 scan0171 | |
| Technical suggestion to prevent undershield damage from square collars by riveting a small steel plate at the contact point. | 21th Sep 1911 | Box 81 \ 1 scan0172 | |
| Broken undersheets and a proposal for an experimental strengthening piece. | 2nd Oct 1911 | Box 81 \ 1 scan0173 | |
| Meeting minutes from late 1911 detailing the identification and resolution of undersheet breakages. | 28th Nov 1911 | Box 81 \ 1 scan0174 | |
| Meeting notes regarding modifications to undersheets and undershields. | 29th Dec 1911 | Box 81 \ 1 scan0175 | |
| Chassis modifications for chassis 1694, purchased by Baron Korff for use in Russia. | 14th Nov 1911 | Box 81 \ 1 scan0176 | |
| Instruction sheet querying the necessity of fitting a protective shield for the oil pump and pipes for a customer's car. | 22th Nov 1911 | Box 81 \ 1 scan0177 | |
| Departmental memo to Mr Spinney regarding fitting a protective shield to chassis 1694 for Baron Korff. | 25th Nov 1911 | Box 81 \ 1 scan0178 | |
| Expediting experiments on new undersheets to cool car floorboards before the warm weather arrives. | 3rd Apr 1912 | Box 81 \ 1 scan0179 | |
| Departmental memo regarding a delay in testing a new type of undersheet on chassis 1948. | 29th Apr 1912 | Box 81 \ 1 scan0180 | |
| Typed memo regarding the design and potential benefits of undersheets for car 1844. | 8th Jan 1913 | Box 81 \ 1 scan0181 | |
| Seeking agreement to fit an experimental car with an undersheet following a suggestion. | 13th Jan 1913 | Box 81 \ 1 scan0182 | |
| Decision not to standardise ventilated undershields, based on a negative report. | 28th Jul 1913 | Box 81 \ 1 scan0183 | |
| Issue with the car's undersheeting allowing water to splash the driver. | 31th Dec 1913 | Box 81 \ 1 scan0184 | |
| The fitting of a new two-part undershield to improve upon the Austrian Trials type. | 22th Jan 1914 | Box 81 \ 1 scan0185 | |
| Extract discussing potential improvements to the standard car engine undershields. | 18th Aug 1916 | Box 81 \ 1 scan0186 | |
| Revisions and additions to the 'After the War Chassis' specifications. | 19th Sep 1917 | Box 81 \ 1 scan0187 | |
| Technical issues and potential improvements on various car components. | 19th Sep 1917 | Box 81 \ 1 scan0188 | |
| Construction of a new post-war chassis, particularly addressing the need for a self-starter for the American market. | 19th Sep 1917 | Box 81 \ 1 scan0189 | |
| List of decisions regarding parts to be incorporated into the post-war chassis. | 19th Sep 1917 | Box 81 \ 1 scan0190 | |
| Numbered list of vehicle component specifications and modifications, page 2. | 11th Mar 1910 | Box 81 \ 1 scan0191 | |
| Bronze bushes fitted to 1201 chassis universal coupling. | 11th Mar 1910 | Box 81 \ 1 scan0192 | |
| 1700 style front universal joint broaching. | 28th Nov 1911 | Box 81 \ 1 scan0193 | |
| Acknowledging receipt of designs and forwarding them to the Technical Department for criticism. | 5th Mar 1912 | Box 81 \ 1 scan0194 | |
| Fault with the universal joints on old type cars and the recommended fix. | 6th Mar 1912 | Box 81 \ 1 scan0195 | |
| Provisional specification for a De Dion type universal joint with bronze pads invented by Mr. Burts. | 23th Feb 1914 | Box 81 \ 1 scan0196 | |
| Departmental memo from I. Everard Burt proposing a chassis improvement with attached drawings and specification. | 28th Feb 1912 | Box 81 \ 1 scan0197 | |
| Departmental memo regarding a patent idea for increasing the wearing surfaces of universal joints. | 5th Jun 1912 | Box 81 \ 1 scan0198 | |
| Technical Committee's workload preventing proposal review, with a subsequent urgent handwritten request to examine an expiring patent. | 17th Jun 1912 | Box 81 \ 1 scan0199 | |
| To Mr. Royce regarding knocking issues with DeDion type universal joints and proposed solutions. | 2nd Jul 1912 | Box 81 \ 1 scan0200 | |
| Knocking issues, clearances, and a provisional patent. | 10th Jul 1912 | Box 81 \ 1 scan0201 | |
| Letter to Mr Burt providing feedback from Mr Royce on proposed improvements to DeDion type Universal Joints. | 10th Jul 1912 | Box 81 \ 1 scan0202 | |
| Previously unadopted scheme by Mr Royce due to a reduction in a pin's bearing surface. | 10th Jul 1912 | Box 81 \ 1 scan0203 | |
| To Mr Warwick from DA regarding an order for 'Ayrtite' sleeves for valve stays. | 7th Jan 1921 | Box 81 \ 2 scan0001 | |
| The ordering of Ayrtite valve stem sleeves for an experimental car engine. | 10th Jan 1921 | Box 81 \ 2 scan0002 | |
| Proposing to test Ayrtite Sleeves for enclosing valves, with handwritten notes on the results. | 16th Feb 1921 | Box 81 \ 2 scan0003 | |
| Letter from The Streatham Engineering Co., Ltd suggesting the testing of Ayrtite Sleeves on cars. | 20th Jul 1922 | Box 81 \ 2 scan0004 | |
| Letter from Darracq Motor Engineering requesting information to manufacture Air Tight Sleeves for new models. | 1st Jul 1922 | Box 81 \ 2 scan0005 | |
| Letter discussing altering a pump due to a noisy and unreliable relief valve. | 14th Dec 1910 | Box 81 \ 2 scan0006 | |
| Recurring faults with Petrol Pressure Relief Valves and issues with their repair. | 2nd Jul 1914 | Box 81 \ 2 scan0007 | |
| Unsatisfactory pressure relief valve and the need for a reliable pump. | 30th Jul 1914 | Box 81 \ 2 scan0008 | |
| Cover memo for a letter from Springfield regarding the Air Pressure Relief Valve. | 16th Aug 1921 | Box 81 \ 2 scan0009 | |
| Design of an air pressure relief valve, referencing a Cadillac design as an improvement. | 28th Jul 1921 | Box 81 \ 2 scan0010 | |
| Letter discussing the need for a relief valve due to high altitude, sand, and temperature extremes, referencing Cadillac systems. | 15th Feb 1916 | Box 81 \ 2 scan0011 | |
| The unsatisfactory enamelling of water pumps and a request for an immediate change to an improved process. | 15th Feb 1916 | Box 81 \ 2 scan0012 | |
| Confirming the completion of an experiment on water pump casings. | 24th Sep 1917 | Box 81 \ 2 scan0013 | |
| The conversion of an experimental C2 engine into an Eagle 8 type with a list of new experimental parts. | 5th Oct 1917 | Box 81 \ 2 scan0014 | |
| The preparation of water pump tests and their components. | 5th Oct 1917 | Box 81 \ 2 scan0015 | |
| Recommendation to use copal varnish instead of Ripolin enamel on water pump casings. | 28th Dec 1917 | Box 81 \ 2 scan0016 | |
| Corrosion on aluminium engine water circulation fittings and the effectiveness of different protective enamels. | 16th Feb 1916 | Box 81 \ 2 scan0017 | |
| Instruction to halt delivery and testing of non-enamelled Water Pumps supplied by Messrs Triumph. | 16th Feb 1916 | Box 81 \ 2 scan0018 | |
| Departmental memo concerning the investigation and potential fitting of detachable wheels. | 1st Feb 1912 | Box 81 \ 2 scan0019 | |
| Departmental memo discussing the policy on not adopting detachable wheels due to design difficulties with Mr. Royce's patent. | 24th Apr 1912 | Box 81 \ 2 scan0020 | |
| Departmental memo expressing an opinion on a detachable wheel. | 24th Apr 1912 | Box 81 \ 2 scan0021 | |
| Internal memorandum discussing the policy on fitting detachable wheels versus detachable rims. | 11th Feb 1912 | Box 81 \ 2 scan0022 | |
| The second page of a typed letter with a handwritten signature and a French administrative stamp. | 24th Apr 1912 | Box 81 \ 2 scan0023 | |
| Departmental memo discussing the company's position and recommendations regarding detachable wheels and rims. | 27th Mar 1912 | Box 81 \ 2 scan0024 | |
| Detachable wheels, competitor activity, and guidance for salesmen. | 18th Apr 1912 | Box 81 \ 2 scan0025 | |
| Departmental memo regarding correspondence about detachable wheels. | 27th Apr 1912 | Box 81 \ 2 scan0026 | |
| Note specifying the identification letters and numbers for various types of Dunlop detachable wheels and hubs. | 22th Dec 1926 | Box 81 \ 2 scan0027 | |
| Need for a suitable stand for changing tyres on detachable wheels and proposing a wall-mounted design. | 23th Jul 1919 | Box 81 \ 2 scan0028 | |
| Policy on changing tyres on rims and the development of a garage stand. | 20th Aug 1919 | Box 81 \ 2 scan0029 | |
| Examination of a connecting rod failure, focusing on the white metal application for Eagle engine rods. | 15th Apr 1915 | Box 81 \ 2 scan0030 | |
| Request to send a 4-bolt connecting rod for an Eagle engine to St. Margaret's with specific modifications. | 12th May 1915 | Box 81 \ 2 scan0031 | |
| Rig for testing the adhesion of whitemetal. | 22th Nov 1918 | Box 81 \ 2 scan0032 | |
| Plan for adhesion tests on white metal for connecting rods. | 26th Nov 1918 | Box 81 \ 2 scan0033 | |
| Requesting modifications to plates for white metal adhesion tests, specifically changing the material and outside diameter. | 27th Nov 1918 | Box 81 \ 2 scan0034 | |
| Examination of 'Condor' engine connecting rods and the condition of the bronze bush. | 5th Jun 1919 | Box 81 \ 2 scan0035 | |
| Re-tests of Condor engine connecting rods and the issue of whitemetal cracking in bearings. | 13th Jun 1919 | Box 81 \ 2 scan0036 | |
| Whitemetal issues in various engines and a discussion on the 'Condor' engine's horsepower rating. | 13th Jun 1919 | Box 81 \ 2 scan0037 | |
| List of proposed alterations for the American market car, page 2. | 2nd Dec 1919 | Box 81 \ 2 scan0038 | |
| List of proposed alterations and improvements for the American car model, page 5. | 2nd Dec 1919 | Box 81 \ 2 scan0039 | |
| Extract from a letter detailing alterations to a chassis for the U.S.A. market. | 15th Aug 1923 | Box 81 \ 2 scan0040 | |
| Decisions and comments on Springfield Standardisation Sheets numbers 7 to 16 regarding proposed alterations. | 24th Aug 1928 | Box 81 \ 2 scan0041 | |
| List of decisions on proposed technical alterations for various vehicle components. | 24th Aug 1923 | Box 81 \ 2 scan0042 | |
| Instruction for a similar scheme to be adopted at Derby to ensure cars are similar. | 24th Aug 1923 | Box 81 \ 2 scan0043 | |
| Letter from Springfield about a proposed alteration to chassis manufacture. | 28th Aug 1923 | Box 81 \ 2 scan0044 | |
| Letter regarding a proposal for a 6-volt Westinghouse system, body brackets, and a blueprint for a waterproof toolbox. | 15th Aug 1923 | Box 81 \ 2 scan0045 | |
| Standardisation of Akernite Pivot Thrust Washers and an alteration proposal from Springfield. | 28th Aug 1923 | Box 81 \ 2 scan0046 | |
| Telegraphed list of design alterations for cars in America and managing communication with the Springfield facility. | 29th Aug 1923 | Box 81 \ 2 scan0047 | |
| Report, standardisation sheets, and alterations made by the Springfield factory. | 29th Aug 1923 | Box 81 \ 2 scan0048 | |
| Letter to Rolls-Royce of America regarding proposed alterations and standardisation of cars. | 29th Aug 1923 | Box 81 \ 2 scan0049 | |
| Letter to Rolls-Royce of America regarding 'American Alterations' and enclosing Mr. Royce's remarks. | 5th Sep 1923 | Box 81 \ 2 scan0050 | |
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