| Description | Date | Identifier | |
| High-speed steering wobbles in Phantom and Silver Ghost cars using friction shock absorbers. | 1st Aug 1925 | Box 67 \ 3 scan0210 | |
| Vehicle steering, suspension, and wheel balance issues. | 21th Aug 1925 | Box 67 \ 3 scan0211 | |
| The nature and causes of high-speed steering wobble, including observations of wheel marks on the road. | 21th Aug 1925 | Box 67 \ 3 scan0212 | |
| Analysing the causes and mechanics of criss-cross vibration and wheel wobble in a front axle. | 1st Aug 1925 | Box 67 \ 3 scan0213 | |
| Vehicle wobble, hydraulic damping, and suspension tests, comparing the Phantom and Silver Ghost models. | 21th Aug 1925 | Box 67 \ 3 scan0214 | |
| Potential change to steering parts and instructions to limit production accordingly. | 21th Aug 1925 | Box 67 \ 3 scan0215 | |
| Responding to a complaint about tyre pressures and steering wobbles, defending the Experimental Department's procedures. | 21th Aug 1925 | Box 67 \ 3 scan0216 | |
| Analysing steering wobble caused by out-of-balance tyres and proposing solutions involving shock dampers and steering friction. | 1st Aug 1925 | Box 67 \ 3 scan0217 | |
| Causes and remedies for steering wobble, specifically the 'pit-pat' phenomenon. | 21th Aug 1925 | Box 67 \ 3 scan0218 | |
| Letter from F.H. Royce discussing the causes and potential solutions for high-speed wobbles in cars, particularly related to low-pressure tyres. | 21th Aug 1925 | Box 67 \ 3 scan0219 | |
| Causes of and potential solutions for high and low-speed steering wobbles. | 22th Aug 1925 | Box 67 \ 3 scan0220 | |
| Continued memo discussing high-speed wobble issues on the Silver Ghost chassis compared to the Phantom. | 22th Aug 1925 | Box 67 \ 3 scan0221 | |
| Proposed hydraulic damper for the Phantom front axle to address high-speed wobble issues. | 22th Aug 1925 | Box 67 \ 3 scan0222 | |
| High-speed steering wobbles, comparing balloon and high-pressure tyres. | 22th Aug 1925 | Box 67 \ 3 scan0223 | |
| Preventing steering wobbles by balancing wheels and maintaining tyre pressures on cars with 4-wheel brakes. | 1st Aug 1925 | Box 67 \ 3 scan0224 | |
| Incorrect steering gauge supplied by Dunlops and the planned action. | 24th Aug 1925 | Box 67 \ 3 scan0225 | |
| Replacement of cast aluminium steering wheel centres with Duralumin forged centres for the 'New Phantom' model. | 25th Aug 1925 | Box 67 \ 3 scan0226 | |
| Physics of high-speed steering wobbles, including precession and natural frequency. | 24th Aug 1925 | Box 67 \ 3 scan0227 | |
| Testing an axle with vertical steering pivots to resolve high-speed steering wobble. | 25th Aug 1925 | Box 67 \ 3 scan0228 | |
| High-speed steering wobbles and tests with hydraulic damping. | 1st Aug 1925 | Box 67 \ 3 scan0229 | |
| The effects of different tyre types on high-speed steering wobble. | 25th Aug 1925 | Box 67 \ 3 scan0230 | |
| Vehicle wobble, comparing the amplitude between balloon and high-pressure tyres. | 1st Aug 1925 | Box 67 \ 3 scan0231 | |
| The use of glycerine, towing tests, and addressing wobbles with balloon tyres on Phantom and Silver Ghost models. | 5th Aug 1925 | Box 67 \ 3 scan0232 | |
| Investigation of steering column vibration on Lord Montagu's car compared to the London Trials cars. | 26th Aug 1925 | Box 67 \ 3 scan0233 | |
| Potential causes and solutions for high-speed steering wobbles, specifically regarding pivot vertical and radius rods. | 26th Aug 1925 | Box 67 \ 3 scan0234 | |
| Steering alterations, high-speed wobbles, and the potential acquisition of a Lancia for comparison. | 27th Aug 1925 | Box 67 \ 3 scan0235 | |
| Potential modifications to improve damping, such as variations in the vertical pivot and lightening the front axle. | 28th Aug 1925 | Box 67 \ 3 scan0236 | |
| Secret memo proposing steering improvements for the New Phantom and Goshawk models to address high and low speed wobbles. | 28th Aug 1925 | Box 67 \ 3 scan0237 | |
| Brief report on tests conducted to investigate high-speed steering wobbles. | 28th Aug 1925 | Box 67 \ 3 scan0238 | |
| Short internal memo regarding a telephone message received from London, requesting instructions for the Works. | 28th Aug 1925 | Box 67 \ 3 scan0239 | |
| Telegram from Mr. Royce to CJ proposing steering improvements for the New Phantom and Goshawk models. | 28th Aug 1925 | Box 67 \ 3 scan0240 | |
| Requesting a correction to a previous message, changing the word 'perfect' to 'purchase'. | 29th Aug 1925 | Box 67 \ 3 scan0241 | |
| Theory behind high-speed steering wobbles and a proposal to build a test apparatus. | 29th Aug 1925 | Box 67 \ 3 scan0242 | |
| High-speed steering wobbles on an axle fitted with disc wheels. | 12th Jun 1925 | Box 67 \ 3 scan0243 | |
| The efficiency of a large diameter nut and worm for steering. | 12th Jun 1925 | Box 67 \ 3 scan0244 | |
| The efficiency and friction of a nut under load, particularly in a reverse direction. | 12th Jun 1925 | Box 67 \ 3 scan0245 | |
| Obtaining a steering gauge from W.W. for inspection and follow-up with the makers. | 31th Aug 1925 | Box 67 \ 3 scan0246 | |
| Outlining the testing procedure for new steering and suspension components for the New Phantom and Goshawk models. | 31th Aug 1925 | Box 67 \ 3 scan0247 | |
| The steering ratio of a worm and nut, pending experimental results. | 1st Sep 1925 | Box 67 \ 3 scan0248 | |
| Failure scenarios and associated costs for the New Phantom steering system. | 1st Sep 1925 | Box 67 \ 3 scan0249 | |
| Logistics and recommendation for fitting improved steering parts at Derby before sending a car to France. | 1st Sep 1925 | Box 67 \ 3 scan0250 | |
| Specification memo detailing a revised steering box fitted to a chassis. | 1st Sep 1925 | Box 67 \ 3 scan0251 | |
| Causes and potential solutions for high-speed wobbles in steering. | 1st Sep 1925 | Box 67 \ 3 scan0252 | |
| Vehicle suspension dynamics, gyroscopic movements, dampers, and weight reduction for the 40/50 car. | 1st Sep 1925 | Box 67 \ 3 scan0253 | |
| From Mr. Royce detailing modifications to steering boxes for the 40/50 HP and 20 HP models. | 1st Sep 1925 | Box 67 \ 3 scan0254 | |
| Required pitch of the steering worm for 40 HP and 20 HP cars. | 1st Sep 1925 | Box 67 \ 3 scan0255 | |
| Steering geometry, specifically a new dashboard bracket, worm lead, and pendulum lever, awaiting experimental results. | 1st Sep 1925 | Box 67 \ 3 scan0256 | |
| Calculations for various steering ratio configurations. | 12th Jun 1925 | Box 67 \ 3 scan0257 | |
| High-speed steering wobbles investigating the effects of out-of-balance wheels. | 12th Jun 1925 | Box 67 \ 3 scan0258 | |
| High-speed steering wobbles. | 12th Jun 1925 | Box 67 \ 3 scan0259 | |
| The causes and contributing factors of high-speed steering wobble and front axle vibration. | 12th Jun 1925 | Box 67 \ 3 scan0260 | |
| The causes of front axle wobble and the application of damping devices to prevent it. | 12th Jun 1925 | Box 67 \ 3 scan0261 | |
| Methods and challenges of damping vehicle wobble via the steering system and axle. | 12th Jun 1925 | Box 67 \ 3 scan0262 | |
| Confirmation of a telegram from R. Royce discussing gyrostatis wobble in relation to wheel speed and brake drums. | 4th Sep 1925 | Box 67 \ 3 scan0263 | |
| High-speed steering wobbles, testing the effects of adding weighted bands and rings to the wheel assembly. | 12th Jun 1925 | Box 67 \ 3 scan0264 | |
| Mechanical device to address high-speed steering wobbles. | 12th Jun 1925 | Box 67 \ 3 scan0265 | |
| Proposal for an anti-wobbling device involving strengthening shock absorbers and adding a torsional spring. | 7th Sep 1925 | Box 67 \ 3 scan0266 | |
| Various proposals and modifications for the steering system. | 7th Sep 1925 | Box 67 \ 3 scan0267 | |
| Priority of chassis modifications over steering proposals. | 7th Sep 1925 | Box 67 \ 3 scan0268 | |
| The balance of road wheels and its effect on steering wobble, comparing against other makes. | 10th Sep 1925 | Box 67 \ 3 scan0269 | |
| Alteration to the pivot lean to address high-speed wobbles. | 10th Sep 1925 | Box 67 \ 3 scan0270 | |
| To suspend work on a damped pendulum lever alteration due to dissatisfaction with the proposed scheme. | 10th Sep 1925 | Box 67 \ 3 scan0271 | |
| Proposed steering modifications for the New Phantom and India models to address slow speed wobbles and road shocks. | 10th Sep 1925 | Box 67 \ 3 scan0272 | |
| Remedies for high-speed wobbles, including tyre choice, shock dampers, and a new pendulum lever design. | 1st Sep 1925 | Box 67 \ 3 scan0273 | |
| High-speed steering wobble caused by wheel imbalance in the Silver Ghost and Phantom models. | 1st Sep 1925 | Box 67 \ 3 scan0274 | |
| Internal memorandum discussing the causes and potential solutions for high-speed wheel wobble. | 14th Sep 1925 | Box 67 \ 3 scan0275 | |
| Wheel wobble, tramping speed, and the effect of pivot angles. | 14th Sep 1925 | Box 67 \ 3 scan0276 | |
| Investigations into high and low-speed steering wobbles and potential solutions. | 14th Sep 1925 | Box 67 \ 3 scan0277 | |
| Confirmation of wire regarding lightening axle, brake, hub, and wheel components. | 14th Sep 1925 | Box 67 \ 3 scan0278 | |
| The results of tests using hydraulic dampers to reduce high-speed steering wobbles. | 16th Sep 1925 | Box 67 \ 3 scan0279 | |
| Decisions made to address high-speed steering wobbles on the Phantom model. | 23th Sep 1925 | Box 67 \ 3 scan0280 | |
| Proposed modifications to front axle, wheels, and braking systems. | 24th Sep 1925 | Box 67 \ 3 scan0281 | |
| Outlining urgent experiments required for a Phantom steering box, rear axle, and hydraulic shock absorbers. | 24th Sep 1925 | Box 67 \ 3 scan0282 | |
| Modification to the Phantom steering system to address high-speed wobble. | 25th Sep 1925 | Box 67 \ 3 scan0283 | |
| The urgent proposal to adopt and standardize a new thread for the steering shaft and nut on the New Phantom chassis. | 25th Sep 1925 | Box 67 \ 3 scan0284 | |
| Phantom Steering, customer tyre instructions, and trials for pivots and axles. | 25th Sep 1925 | Box 67 \ 3 scan0285 | |
| High-speed steering wobbles, testing different hub offsets and the effect of single-wheel braking. | 12th Jun 1925 | Box 67 \ 3 scan0286 | |
| The preference for a rigidly held axle over an equalised brake system that can pivot forward. | 26th Sep 1925 | Box 67 \ 3 scan0287 | |
| Modifications for a Phantom car destined for France, including steering, axle, and engine updates. | 26th Sep 1925 | Box 67 \ 3 scan0288 | |
| Internal memorandum discussing the testing and standardisation of a .940 lead worm for the 40/50 Phantom chassis steering system. | 9th Sep 1925 | Box 67 \ 3 scan0289 | |
| Implementation of different steering worm gears for production cars, referencing Mr. Royce's preference. | 28th Sep 1925 | Box 67 \ 3 scan0290 | |
| Production timeline for new steering columns pending a 10,000-mile trial. | 28th Sep 1925 | Box 67 \ 3 scan0291 | |
| Tyre balance weights and a steering component issue. | 28th Sep 1925 | Box 67 \ 3 scan0292 | |
| Cancelling the new damped pendulum lever steering scheme and reverting to the old design. | 23th Sep 1925 | Box 67 \ 3 scan0293 | |
| Proposals for steering modifications to be fitted on the 10,000-mile standardization trial for the 'New Phantom'. | 29th Sep 1925 | Box 67 \ 3 scan0294 | |
| Investigations into high-speed steering wobbles. | 29th Sep 1925 | Box 67 \ 3 scan0295 | |
| High-speed steering wobbles and potential solutions. | 1st Sep 1925 | Box 67 \ 3 scan0296 | |
| Diagram comparing the effect of removing a side-steering tube on high-speed steering wobbles. | 30th Sep 1925 | Box 67 \ 3 scan0297 | |
| Production timeline for a new steering column and box for the 40/50 HP 'Phantom' chassis. | 29th Sep 1925 | Box 67 \ 3 scan0298 | |
| 10,000-mile test for the New Phantom, including delays, steering modifications, and anti-wobble device experiments. | 1st Oct 1925 | Box 67 \ 3 scan0299 | |
| The out-of-balance limits for Dunlop tyres for the New Phantom steering system. | 1st Oct 1925 | Box 67 \ 3 scan0300 | |
| Manufacturing difficulties with whitemetal lined steering nuts and suggestions from Mr. Royce. | 2nd Oct 1925 | Box 67 \ 3 scan0301 | |
| Investigation into complaints of stiff steering on the 'New Phantom' chassis. | 10th Oct 1925 | Box 67 \ 3 scan0302 | |
| Suggesting a design improvement for sockets by rounding their edges, illustrated with 'before' and 'after' sketches. | 1st Oct 1925 | Box 67 \ 3 scan0303 | |
| List of modifications for the 'Z' series and next car for France, covering steering, axle, brake, and body components. | 6th Oct 1925 | Box 67 \ 3 scan0304 | |
| List of specifications and modifications for various vehicle components, numbered 13 to 19. | 10th Sep 1925 | Box 67 \ 3 scan0305 | |
| Standardisation of chassis parts for steering pivot pins and bushes to reduce wear. | 10th Sep 1925 | Box 67 \ 3 scan0306 | |
| Steering stiffness on the New Phantom chassis, focusing on the design of hardened balls in pivot joints and lubrication methods. | 9th Oct 1925 | Box 67 \ 3 scan0307 | |
| Steering and clutch modifications for chassis 107-MC, owned by G. Summers Esq. | 13th Oct 1925 | Box 67 \ 3 scan0308 | |
| New weight-saving design for the Phantom front axle and steering levers. | 13th Oct 1925 | Box 67 \ 3 scan0309 | |
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