| Description | Date | Identifier | |
| Loading of rear shock absorbers, comparing settings with American car standards and a note from Mr. Royce. | 27th Apr 1928 | Box 68 \ 2 scan0226 | |
| Suspension tests for the 40/50 HP Phantom model to improve low-speed riding comfort. | 6th Sep 1928 | Box 68 \ 2 scan0227 | |
| Tests conducted to determine the effect of shock absorbers on vehicle ride quality. | 6th Sep 1928 | Box 68 \ 2 scan0228 | |
| Test report on the effects of reduced tyre pressure, shock absorber loading, and different front springs on vehicle ride comfort. | 6th Sep 1928 | Box 68 \ 2 scan0229 | |
| Report page detailing test results on internal spring friction and rear spring ratings. | 6th Sep 1928 | Box 68 \ 2 scan0230 | |
| Vehicle suspension tests, comparing ride comfort with different spring ratings, buffer clearances, and shock absorber setups. | 6th Sep 1928 | Box 68 \ 2 scan0231 | |
| Potential improvements to the Phantom's suspension and steering to address high-speed wobbles. | 27th Aug 1928 | Box 68 \ 2 scan0232 | |
| Phantom springing complaints, focusing on leaf friction issues and potential remedies. | 27th Aug 1928 | Box 68 \ 2 scan0233 | |
| Reducing leaf spring friction and wear through polishing and plating the spring plates. | 7th Sep 1928 | Box 68 \ 2 scan0234 | |
| Review of springing complaints and solutions for the 40/50 Hp model. | 7th Sep 1928 | Box 68 \ 2 scan0235 | |
| Owner complaints about sea-sickness and hard riding, related to spring rates and damping. | 7th Sep 1928 | Box 68 \ 2 scan0236 | |
| Bar chart comparing methods to improve the Phantom's low-speed ride quality. | 10th Sep 1928 | Box 68 \ 2 scan0237 | |
| Discrepancies between results of tests on the 40/50 model suspension. | 10th Sep 1928 | Box 68 \ 2 scan0238 | |
| Investigation into noisy shock absorbers on the 20 HP car, caused by the non-return replenishing valve sinking into its aluminium seat. | 1st Dec 1928 | Box 68 \ 2 scan0239 | |
| And blueprint concerning a sticking shock-damper ball valve causing noisy hydraulics. | 12th Dec 1928 | Box 68 \ 2 scan0240 | |
| Lubrication issue with the bottom ball end on shock dampers and proposing a solution. | 12th Dec 1928 | Box 68 \ 2 scan0241 | |
| Strengthening a fractured 'SS' shock damper shaft and discussing the high loads involved. | 10th Jan 1929 | Box 68 \ 2 scan0242 | |
| The investigation and replacement of HP valves in front shock absorbers due to leakage and bent stems. | 6th May 1929 | Box 68 \ 2 scan0243 | |
| Tests to establish standard leakage times for front shock absorbers on various chassis. | 6th May 1929 | Box 68 \ 2 scan0244 | |
| Valve and shock absorber testing, focusing on leakage times and vehicle pitching issues. | 6th May 1929 | Box 68 \ 2 scan0245 | |
| The development and testing procedures for shock absorbers, including the need for a dedicated test rig. | 6th May 1929 | Box 68 \ 2 scan0246 | |
| Testing procedures for shock absorbers, including valve specifications and selection criteria. | 6th May 1929 | Box 68 \ 2 scan0247 | |
| Improvements to shock absorber testing and production instructions for valves. | 7th May 1929 | Box 68 \ 2 scan0248 | |
| Shock absorbers, enclosing a letter from Mr. Olley for comment. | 7th May 1929 | Box 68 \ 2 scan0249 | |
| Letter providing comments and analysis on shock absorber issues, particularly knocks and leaks. | 26th Apr 1929 | Box 68 \ 2 scan0250 | |
| Troubleshooting ineffective front shock absorbers and proposed improvements and settings. | 7th Jul 1929 | Box 68 \ 2 scan0251 | |
| Shock absorber knocks, design issues, and potential modifications for 40/50 and Phantom models. | 7th Jul 1929 | Box 68 \ 2 scan0252 | |
| The adoption of drilled HP shock absorber valves and lubrication of Phantom I springs with grooves. | 19th Nov 1929 | Box 68 \ 2 scan0253 | |
| Use of drilled valves in hydraulic shock dampers. | 10th Dec 1929 | Box 68 \ 2 scan0254 | |
| The use of drilled valves and damper performance for Phantom I and II models. | 10th Dec 1929 | Box 68 \ 2 scan0255 | |
| Standardisation of chassis parts concerning the adoption of drilled HP shock absorber valves and lubrication of Phantom I springs. | 20th Nov 1929 | Box 68 \ 2 scan0256 | |
| Inadequacy of PI shock absorber replenishing valves and proposed modifications to prevent knocking. | 10th Sep 1930 | Box 68 \ 2 scan0257 | |
| Voids and knocking in horizontal shock absorbers caused by inadequate replenishing valves. | 9th Sep 1924 | Box 68 \ 2 scan0258 | |
| Recommending various solutions for storing tools and spares on the 46-PK model and other cars. | 9th Sep 1924 | Box 68 \ 2 scan0259 | |
| The suitability of spanners for inclusion in the Tool Kit for the 'V' series chassis. | 6th Mar 1925 | Box 68 \ 2 scan0260 | |
| EWT requesting suggestions regarding the tool kit for the 'Phantom' model. | 26th Nov 1926 | Box 68 \ 2 scan0261 | |
| Proposal to reduce the size of the tool kit provided with the 'Phantom' chassis. | 24th Nov 1926 | Box 68 \ 2 scan0262 | |
| Proposal to reduce the standard tool kit for the 40/50 HP New Phantom chassis. | 16th Nov 1926 | Box 68 \ 2 scan0263 | |
| List of tools for a proposed extra kit, with part numbers and cost analysis. | 16th Nov 1926 | Box 68 \ 2 scan0264 | |
| Proposal to reduce the list of supplied spares based on the 14,000-mile trials of the 11-EX vehicle. | 16th Dec 1926 | Box 68 \ 2 scan0265 | |
| Request to divide the tool kit for the Phantom and 20HP models into two categories. | 16th Dec 1926 | Box 68 \ 2 scan0266 | |
| Recommendation to supply a more satisfactory mallet in the tool kit to prevent splitting. | 16th Dec 1926 | Box 68 \ 2 scan0267 | |
| Contents and necessity of the standard vehicle tool kit. | 17th Dec 1926 | Box 68 \ 2 scan0268 | |
| Potential reductions to the vehicle's tool kit, comparing it to competitors. | 13th Dec 1926 | Box 68 \ 2 scan0269 | |
| Suggesting the list of accessories is not explanatory enough and proposing an up-to-date lecture on the subject. | 13th Dec 1926 | Box 68 \ 2 scan0270 | |
| Proposal to replace the wooden mallet with a rubber-headed one in the 20 HP and 40/50 HP chassis tool kits. | 21th Dec 1926 | Box 68 \ 2 scan0271 | |
| List of essential tools and spares to be carried on the Phantom car. | 24th Jan 1927 | Box 68 \ 2 scan0272 | |
| Required tool kit for the Phantom model for daily use versus extended tours. | 31th Jan 1927 | Box 68 \ 2 scan0273 | |
| Proposal to delete and combine parts from the Phantom model tool kit and spares list. | 25th Feb 1927 | Box 68 \ 2 scan0274 | |
| Requesting feedback from the Sales department regarding proposed modifications. | 25th Feb 1927 | Box 68 \ 2 scan0275 | |
| List of modifications and deletions to the tool kit for the Phantom Chassis. | 25th Feb 1927 | Box 68 \ 2 scan0276 | |
| Parts list for various brushes, connections, and a wallet for brushes. | 25th Feb 1927 | Box 68 \ 2 scan0277 | |
| Following up on proposed modifications for the Phantom tool kit. | 9th Mar 1927 | Box 68 \ 2 scan0278 | |
| List of items to be deleted from the tool kit commencing with the 'K' series chassis. | 18th Mar 1927 | Box 68 \ 2 scan0279 | |
| Reporting on the unsatisfactory performance of a pair of pliers for general chassis work. | 6th May 1927 | Box 68 \ 2 scan0280 | |
| Correct positioning of the tool box step bracket to avoid fouling other components. | 4th Jan 1928 | Box 68 \ 2 scan0281 | |
| Adjusting the position of tool box steps and step-irons. | 7th Jan 1928 | Box 68 \ 2 scan0282 | |
| From 'R' critiquing a proposed design for a sports tool box and running board, suggesting more practical and cost-effective alternatives. | 17th Jan 1928 | Box 68 \ 2 scan0283 | |
| Design, production, weight, and cost of sports toolboxes and running boards. | 21th Jan 1928 | Box 68 \ 2 scan0284 | |
| Improvements for the Phantom and 'SS' models regarding the tool kit, side lamps, and screen wiper. | 17th Oct 1928 | Box 68 \ 2 scan0285 | |
| Possibility of reducing the weight and dividing the tool kit for the S.S. & Phantom models. | 1st May 1929 | Box 68 \ 2 scan0286 | |
| Breakdown of weights for the tool kit on S.S. and Phantom models. | 1st May 1929 | Box 68 \ 2 scan0287 | |
| List of tools and spares rarely required on the road for the Phantom model. | 1st May 1929 | Box 68 \ 2 scan0288 | |
| Reduction of tools provided in the vehicle toolkit for customers. | 1st May 1929 | Box 68 \ 2 scan0289 | |
| Reduction and contents of the tool kit carried on 40/50 HP cars. | 17th May 1929 | Box 68 \ 2 scan0290 | |
| Supply of a chassis plug for battery charging and inspection lamps. | 19th Oct 1926 | Box 68 \ 2 scan0291 | |
| List of essential tools and spares to be carried in a Phantom car. | 24th Jan 1927 | Box 68 \ 2 scan0292 | |
| Exclusion of dynamo and starter motor brushes from the spares kit. | 21th Feb 1927 | Box 68 \ 2 scan0293 | |
| Print for a spare wheel carrier. | 20th Aug 1919 | Box 68 \ 3 scan0001 | |
| Directive from Mr. Royce regarding alterations to the spare wheel mounting on Chassis 1 EX. | 21th Aug 1919 | Box 68 \ 3 scan0002 | |
| Suggestion from Paris for supporting spare wheels on the running board and requesting a sketch. | 22th Aug 1919 | Box 68 \ 3 scan0003 | |
| Notes from a meeting discussing Mr. Royce's wish to fit spare wheels to the rear of the car. | 24th Oct 1919 | Box 68 \ 3 scan0004 | |
| Redesign for carrying a spare wheel on the footboards. | 23th Mar 1920 | Box 68 \ 3 scan0005 | |
| Methods for carrying spare wheels fitted with R.W. Discs. | 18th Mar 1920 | Box 68 \ 3 scan0006 | |
| Modifications for a spare wheel carrier on car 4EX, referencing two blueprints. | 10th Nov 1920 | Box 68 \ 3 scan0007 | |
| Lack of a luggage grid and issues with the spare wheel carrier for Mr. Royce's 6.EX car. | 22th Nov 1920 | Box 68 \ 3 scan0008 | |
| Listing experimental parts fitted to chassis 4.EX. | 2nd Dec 1920 | Box 68 \ 3 scan0009 | |
| Requesting modifications to the 6.EX spare wheel carrier for easier access. | 24th Feb 1921 | Box 68 \ 3 scan0010 | |
| Optimal positioning of the spare wheel. | 27th Apr 1921 | Box 68 \ 3 scan0011 | |
| The selection and supply of tyre carriers for the 40/50 chassis. | 5th Oct 1922 | Box 68 \ 3 scan0012 | |
| Final design and sale of a wheel carrier for the 40/50 model, pending an official experimental report. | 14th Apr 1923 | Box 68 \ 3 scan0013 | |
| Requesting information on side wheel carrier positioning for the 40/50 model to resolve a fitment issue with the oil tank. | 9th May 1923 | Box 68 \ 3 scan0014 | |
| Position of the 40/50 spare wheel carrier on the 6-EX car, referencing an attached sketch. | 14th May 1923 | Box 68 \ 3 scan0015 | |
| Request for standardisation sheets for an oil level indicator to improve the 40/50 wheel carrier. | 17th May 1923 | Box 68 \ 3 scan0016 | |
| Design options and arrangements for a side-mounted spare wheel carrier for the 40/50 model. | 19th Jul 1923 | Box 68 \ 3 scan0017 | |
| Design improvements for the spare wheel carrier on the 20 HP, 40/50 HP, and Goshawk models. | 23th Nov 1923 | Box 68 \ 3 scan0018 | |
| Design specifics of a 40/50 spare wheel carrier, questioning its origin and noting a potential weakness in a modified version. | 16th Jul 1924 | Box 68 \ 3 scan0019 | |
| Failures and fitting issues with tyre brackets for a 40/50 HP spare wheel carrier. | 18th Jul 1924 | Box 68 \ 3 scan0020 | |
| Design of a suitable spare wheel carrier for the 40/50 car model. | 18th Jul 1924 | Box 68 \ 3 scan0021 | |
| Proposed modification to address a weakness in the fixing of the spare wheel carrier to the 40/50 HP chassis frame. | 22th Jul 1924 | Box 68 \ 3 scan0022 | |
| Testing and development of improved 40/50 HP spare wheel carriers. | 23th Jul 1924 | Box 68 \ 3 scan0023 | |
| The fitting of a 40/50 HP spare wheel carrier by coachbuilder Barkers. | 24th Jul 1924 | Box 68 \ 3 scan0024 | |
| 40-50 Chassis spare wheel carrier, attaching a related memo from Mr. Spinney. | 24th Jul 1924 | Box 68 \ 3 scan0025 | |
| Issues and potential improvements for the spare wheel carrier on the 40/50 HP chassis. | 21th Jul 1924 | Box 68 \ 3 scan0026 | |
| Arrangement to supply a new type of spare wheel carrier from Barkers for fitting to car No.9-PK. | 24th Jul 1924 | Box 68 \ 3 scan0027 | |
| Letter from coachbuilder Barker & Co. confirming the dispatch of two sets of spare wheel carriers. | 30th Jul 1924 | Box 68 \ 3 scan0028 | |
| The despatch of two sets of new pattern spare wheel carriers from Barkers for a 40/50 HP chassis, requesting a report on them. | 31th Jul 1924 | Box 68 \ 3 scan0029 | |
| Modifications to the spare wheel carrier and step iron for various car models. | 20th Aug 1924 | Box 68 \ 3 scan0030 | |
| Request for an arrangement drawing of Barkers' latest wheel carrier after receiving rough forgings. | 23th Sep 1924 | Box 68 \ 3 scan0031 | |
| Request to Barkers for an arrangement drawing of a wheel carrier. | 25th Sep 1924 | Box 68 \ 3 scan0032 | |
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