| Description | Date | Identifier | |
| Procuring water temperature regulators from America for the 40/50 HP chassis. | 25th Sep 1919 | Box 78 \ 1 scan0240 | |
| Laboratory report on the capacity and liquid composition of a thermostat expanding reservoir. | 18th Mar 1920 | Box 78 \ 1 scan0241 | |
| The analysis and testing of sylphon tubes for thermostat control. | 23th Mar 1920 | Box 78 \ 1 scan0242 | |
| Continued discussion regarding a variation of approximately 2 degrees found on a valve, possibly due to fitting issues. | 23th Mar 1920 | Box 78 \ 1 scan0243 | |
| Standardisation of thermostat control and the delivery of sylphon tubes from America. | 1st Apr 1920 | Box 78 \ 1 scan0244 | |
| Confirming a cable sent to Mr Olley in the States regarding sylphon tubes for thermostat water connections. | 24th Apr 1920 | Box 78 \ 1 scan0245 | |
| Standardization of the chassis thermostat and the sourcing of Sylphon Tubes. | 27th May 1920 | Box 78 \ 1 scan0246 | |
| Confirmation of a cablegram regarding the delivery of Sylphon tubes. | 11th Jun 1920 | Box 78 \ 1 scan0247 | |
| Delayed cable and the shipment of Fulton Sylphon tubes on the S.S. West Celeron. | 20th Jul 1920 | Box 78 \ 1 scan0248 | |
| The shipment and customs clearance of Sylphon Tubes for chassis thermostat water connections. | 30th Jul 1920 | Box 78 \ 1 scan0249 | |
| Mr. Royce's proposal and sketch for manufacturing Sylphon tubing in-house. | 11th Aug 1920 | Box 78 \ 1 scan0250 | |
| Particulars and test results for a Syphon tube supplied from the U.S.A., noting a substituted part. | 25th Aug 1920 | Box 78 \ 1 scan0251 | |
| Letter discussing the potential use of Sylphon tubing for a combined delivery and relief valve on an air pump. | 24th Sep 1920 | Box 78 \ 1 scan0252 | |
| Letter regarding a pressure issue in a gas tank and a proposed solution. | 24th Sep 1920 | Box 78 \ 1 scan0253 | |
| Correspondence from The Fulton Company regarding the supply of Sylphon samples for a Petrol Valve. | 7th Sep 1920 | Box 78 \ 1 scan0254 | |
| Suggested design for a combined delivery and relief valve on an air pump, using small sylphons. | 25th Sep 1920 | Box 78 \ 1 scan0255 | |
| Requesting information and advice on the operating limits, testing, and installation of Sylphon thermostats. | 13th Oct 1920 | Box 78 \ 1 scan0256 | |
| Copy of a cablegram from Springfield containing a coded message and its translation. | 8th Jan 1920 | Box 78 \ 1 scan0257 | |
| Correspondence regarding the supply and specification of Copper Sylphon Tubes for a 40/50 hp Chassis Petrol Gauge. | 12th Oct 1920 | Box 78 \ 1 scan0258 | |
| List of specifications and modifications for a post-war chassis, continued from a previous page. | 3rd Oct 1916 | Box 78 \ 1 scan0259 | |
| The effects of increasing engine temperature by partially blocking the radiator during a cold weather test drive. | 13th Mar 1919 | Box 78 \ 1 scan0260 | |
| Suggestion to modify airflow by fitting a piece of plywood with a hole to the inside of the radiator. | 13th Mar 1919 | Box 78 \ 1 scan0261 | |
| Provisions for blocking off the radiator in cold weather for the 40/50 chassis. | 4th Apr 1919 | Box 78 \ 1 scan0262 | |
| Engine cooling issues and the necessity of using the full size of the radiator despite the engine running too cold. | 4th Apr 1919 | Box 78 \ 1 scan0263 | |
| Instruction that the first few cars must be sent out without bonnet frames, using simple blanking-off pieces instead. | 22th May 1919 | Box 78 \ 1 scan0264 | |
| Methods for screening radiators and implementing a water bypass system to manage engine temperature. | 28th May 1919 | Box 78 \ 1 scan0265 | |
| Use of radiator louvres and thermometers to control engine temperature. | 2nd Jun 1919 | Box 78 \ 1 scan0266 | |
| Extract discussing seasonal radiator temperature control using plates or boards. | 1st Jun 1919 | Box 78 \ 1 scan0267 | |
| Design and material of a radiator blanking off piece for the 40/50 chassis. | 5th Jun 1919 | Box 78 \ 1 scan0268 | |
| The seasonal adjustment of the radiator bye-pass for the 40/50 chassis. | 22th May 1919 | Box 78 \ 1 scan0269 | |
| Radiator boiling issues during vehicle testing on hills and at high speed. | 28th Jul 1919 | Box 78 \ 1 scan0270 | |
| Design of radiator baffles, comparing circular baffles to flat aluminium strips. | 9th Sep 1919 | Box 78 \ 1 scan0271 | |
| Design and issues with radiator blanking-off plates to manage engine temperature. | 18th Sep 1919 | Box 78 \ 1 scan0272 | |
| Instruction to the Production Department regarding the immediate fitting of radiator blanking plates to current car chassis to resolve a piston knock issue. | 10th Sep 1919 | Box 78 \ 1 scan0273 | |
| Supplying and fitting plates to reduce radiator surface on all produced chassis. | 20th Sep 1919 | Box 78 \ 1 scan0274 | |
| Requesting blueprints and the urgent production of various blanking plates and strips for 40/50 cars. | 22th Sep 1919 | Box 78 \ 1 scan0275 | |
| Partially covering radiators during autumn to maintain an economical engine temperature. | 20th Oct 1919 | Box 78 \ 1 scan0276 | |
| The fitting of blanking plates in radiators and the circulation of associated instructions. | 23th Oct 1919 | Box 78 \ 1 scan0277 | |
| Radiator blanking plates being delivered with new chassis. | 23th Oct 1919 | Box 78 \ 1 scan0278 | |
| Instructions for the use and fitting of radiator blanking plates. | 10th Oct 1919 | Box 78 \ 1 scan0279 | |
| Customer complaints about engine vibration and piston knock, and the results of a demonstration. | 29th Oct 1919 | Box 78 \ 1 scan0280 | |
| Engine issues including spark gap, ignition, engine harshness, and piston knock on cold starts. | 16th Apr 1919 | Box 78 \ 1 scan0281 | |
| Instructions for fitting low and high compression pistons with slotted skirts to specific chassis. | 29th Oct 1919 | Box 78 \ 1 scan0282 | |
| Radiators and blanking plates, referencing a telegram from Mr. Royce. | 11th Nov 1919 | Box 78 \ 1 scan0283 | |
| Fitting of blanking plates to radiators and the circulation of instructions. | 23th Oct 1919 | Box 78 \ 1 scan0284 | |
| Radiator blanking plates for pre-war cars, including radiator sizes and types for different series. | 20th Nov 1919 | Box 78 \ 1 scan0285 | |
| Suggestion for a thermostatic device to control cooling water temperature in cylinder jackets. | 20th Nov 1919 | Box 78 \ 1 scan0286 | |
| Correct use of blanking plates for radiators during winter months. | 25th Nov 1919 | Box 78 \ 1 scan0287 | |
| Use and benefits of supplying four blanking plates for radiators to regulate engine temperature. | 8th Dec 1919 | Box 78 \ 1 scan0288 | |
| List of experimental parts that have been fitted to various chassis. | 10th Dec 1919 | Box 78 \ 1 scan0289 | |
| Failure of radiator plate fixings due to variations in leather packing. | 28th Feb 1920 | Box 78 \ 1 scan0290 | |
| Use of rubber versus leather washers for a radiator blanking plate and its fittings. | 2nd Mar 1920 | Box 78 \ 1 scan0291 | |
| List of components for a trials car intended for the American Company. | 1st Mar 1930 | Box 78 \ 1 scan0292 | |
| Requirement to fit radiator plates suitable for winter conditions upon delivery of a car. | 16th Mar 1920 | Box 78 \ 1 scan0293 | |
| Notification that the radiator blanking plate is now a standard part. | 30th Mar 1920 | Box 78 \ 1 scan0294 | |
| Chasing a reply regarding a blanking plate and fittings for a radiator. | 7th Apr 1920 | Box 78 \ 1 scan0295 | |
| Unsuitability of radiator blanking plates for American driving conditions due to temperature fluctuations. | 23th Apr 1920 | Box 78 \ 1 scan0296 | |
| Adjustable radiator covers and blanking plates suitable for different climates. | 23th Apr 1920 | Box 78 \ 1 scan0297 | |
| Use, effectiveness, and aesthetics of adjustable radiator covers. | 10th May 1920 | Box 78 \ 1 scan0298 | |
| The condition of a vehicle, outlining issues with tyres, battery, carburettor, and exhaust. | 10th Aug 1920 | Box 78 \ 1 scan0299 | |
| Loud boom from the engine at high speeds and proposing a modification to the radiator blanking plates. | 22th Feb 1921 | Box 78 \ 1 scan0300 | |
| Requesting a discussion regarding the use of Blanking Plates with a new Thermostatic control before circulating a related memo. | 22th Apr 1921 | Box 78 \ 1 scan0301 | |
| Following up on a proposal to discuss the use of Blanking Plates with the new Thermostat control. | 3rd Jun 1921 | Box 78 \ 1 scan0302 | |
| 'Winterfront' radiator shutters available in the U.S.A. and their features. | 4th Feb 1921 | Box 78 \ 1 scan0303 | |
| Attaching a copy of a letter from America concerning a Winterfront Automatic Radiator Shutter. | 1st Feb 1921 | Box 78 \ 1 scan0304 | |
| Letter from Rolls-Royce of America to the London office regarding the Winterfront Automatic Radiator Shutter. | 21th Jan 1921 | Box 78 \ 1 scan0305 | |
| Advertising leaflet for the 'Winterfront' automatic radiator shutter. | 21th Jan 1921 | Box 78 \ 1 scan0306 | |
| Advertisement leaflet for the 'Winterfront' automatic radiator shutter system. | 11th Feb 1921 | Box 78 \ 1 scan0307 | |
| Internal request for information on the mileage of U.S.A. Bosch Magnetos and Winterfronts for standardization purposes. | 11th Feb 1921 | Box 78 \ 1 scan0308 | |
| Letter from America concerning U.S.A. Bosch Magnetos and Winterfronts. | 24th Mar 1921 | Box 78 \ 1 scan0309 | |
| Letter providing feedback on the performance of American Bosch magnetos and winterfronts on various cars. | 5th Mar 1921 | Box 78 \ 1 scan0310 | |
| Letter from M. Olley of Rolls-Royce of America discussing the 'Galli-ator' fitting and its cost of $25.00. | 1st Nov 1921 | Box 78 \ 1 scan0311 | |
| Induction pipe changes and solutions for cold starting issues with cars in the American market. | 1st Nov 1921 | Box 78 \ 1 scan0312 | |
| The experimental stage of a vaporiser scheme, comparing its performance with and without an exhaust heated throttle. | 1st Nov 1921 | Box 78 \ 1 scan0313 | |
| Recommendations for improving car performance in cold weather, with a proposed cable reply to Mr. Royce. | 4th Feb 1921 | Box 78 \ 1 scan0314 | |
| Proposal for radiator tube dimensions and ordering tubes for experimental radiators. | 4th Feb 1921 | Box 78 \ 1 scan0315 | |
| Ordering of radiator tubes with specific expanded end dimensions. | 1st Mar 1921 | Box 78 \ 1 scan0316 | |
| The issue of water loss during hill climbing, considering potential solutions such as a new apparatus or engine design. | 7th Sep 1921 | Box 78 \ 1 scan0317 | |
| Tests on a smaller fan pulley to address engine overheating and water loss issues. | 12th Sep 1921 | Box 78 \ 1 scan0318 | |
| Engine water loss and a proposed radiator overflow system with a sketch. | 11th Mar 1929 | Box 78 \ 1 scan0319 | |
| Cross-sectional drawing of a filler neck featuring a stand pipe, perforated plate, and an overflow pipe. | 13th Oct 1921 | Box 78 \ 1 scan0320 | |
| List of experimental work recently instructed on the 40/50 Chassis. | 13th Oct 1921 | Box 78 \ 1 scan0321 | |
| Demountable rims and the status of wheels returned from the Dunlop Rubber Co. Ltd. | 24th Feb 1920 | Box 78 \ 2 scan0001 | |
| Extract detailing plans to test the 4.EX experimental chassis, listing its new features. | 27th Feb 1920 | Box 78 \ 2 scan0002 | |
| Mr. Royce's opinion on fitting Warland rims to cars and proposing Goodyear or Firestone rims as alternatives. | 30th Mar 1920 | Box 78 \ 2 scan0003 | |
| Recommendation to use straight-sided tyres and Goodyear demountable rims for American-made cars. | 30th Mar 1920 | Box 78 \ 2 scan0004 | |
| Comparison of Firestone, Stanwell, and Goodyear demountable rims for straight-sided tyres. | 19th May 1920 | Box 78 \ 2 scan0005 | |
| Report comparing the safety of Stanwell, Goodyear, and Firestone wheel rims when used with a deflated tyre at speed. | 19th May 1920 | Box 78 \ 2 scan0006 | |
| Discussion comparing Firestone, Goodyear, and Dunlop wheel rims for use on both English and American chassis. | 19th May 1920 | Box 78 \ 2 scan0007 | |
| Letter from Firestone Steel Products Co. discussing a suggested locking ring device for 'C' type rims. | 16th Jun 1920 | Box 78 \ 2 scan0008 | |
| Letter comparing the Stanwell split side ring to the Goodyear ring and discussing a manufacturing proposition. | 16th Jun 1920 | Box 78 \ 2 scan0009 | |
| Letter regarding the cancellation of an order for Firestone rims following failures during high-speed road tests. | 25th Jun 1920 | Box 78 \ 2 scan0010 | |
| Pros and cons of different tyre rims from manufacturers like Firestone, Goodyear, and Dunlop. | 25th Jun 1920 | Box 78 \ 2 scan0011 | |
| Comparison of the safety features and failure modes of Goodyear and Firestone tyre and rim designs. | 25th Jun 1920 | Box 78 \ 2 scan0012 | |
| Wheel and rim locking devices, referencing Dunlop, Pierce-Arrow, and Firestone, and proposing new designs. | 25th Jun 1920 | Box 78 \ 2 scan0013 | |
| The quality and suitability of the Firestone rim for wire wheels, including potential modifications and balancing. | 25th May 1920 | Box 78 \ 2 scan0014 | |
| Cover letter forwarding correspondence received from the Firestone Tyre & Rubber Co. Ltd. regarding an interview with Mr. Maddocks. | 7th Jun 1921 | Box 78 \ 2 scan0015 | |
| Return of wheels and demountable rims from the Dunlop Rubber Co. Ltd. | 24th Feb 1920 | Box 78 \ 2 scan0016 | |
| Extract of a memo detailing new features and test plans for the 4.EX experimental chassis. | 27th Feb 1920 | Box 78 \ 2 scan0017 | |
| Comparison of Firestone, Stanwell, and Goodyear demountable rims for straight-sided tyres. | 19th May 1920 | Box 78 \ 2 scan0018 | |
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