| Description | Date | Identifier | |
| Phantom steering issues, attributing them to balloon tyres and suggesting hydraulic damping as a solution. | 18th Aug 1925 | Box 55 \ 3 Scan243 | |
| Points of agreement regarding steering performance on the 12-EX model, covering a new lighter axle and hydraulic shock dampers. | 20th Aug 1926 | Box 55 \ 3 Scan244 | |
| Steering improvements for the 12-EX car, focusing on new front axles and hydraulic dampers to reduce wobbles. | 20th Aug 1926 | Box 55 \ 3 Scan245 | |
| Preference for 6.75 inch tyres over 5 inch tyres despite the increased risk of wobbles. | 30th Aug 1926 | Box 55 \ 3 Scan246 | |
| Standardisation of hydraulic dampers on an experimental 20 HP car. | 30th Aug 1926 | Box 55 \ 3 Scan247 | |
| Limited free movement of hydraulic dampers and the potential safety issues this could cause with balloon tyres. | 14th Sep 1926 | Box 55 \ 3 Scan248 | |
| Safety concern with hydraulic dampers and their limited movement. | 14th Sep 1926 | Box 55 \ 3 Scan249 | |
| Updated settings and modifications for hydraulic shock dampers following tests in France. | 15th Sep 1926 | Box 55 \ 3 Scan250 | |
| Confirming the use of compressor oil for new shock dampers and sending a sample for laboratory analysis. | 15th Sep 1926 | Box 55 \ 3 Scan251 | |
| Responding to a query about the hydraulic shock damper arrangement. | 16th Sep 1926 | Box 55 \ 3 Scan252 | |
| Change in oil type and filling procedure for hydraulic shock dampers. | 15th Sep 1926 | Box 55 \ 3 Scan253 | |
| Proposal to omit the air vent on hydraulic shock dampers. | 17th Sep 1926 | Box 55 \ 3 Scan254 | |
| Laboratory report on the properties of a compressor oil sample, including specific gravity, flash point, acidity, and viscosity. | 22th Sep 1926 | Box 55 \ 3 Scan255 | |
| Letter to the Vacuum Oil Co. Ltd. requesting a suitable oil for a hydraulic damper. | 22th Sep 1926 | Box 55 \ 3 Scan256 | |
| Letter from the Vacuum Oil Company recommending Gargoyle Mobiloil 'E' for a hydraulic damper. | 25th Sep 1926 | Box 55 \ 3 Scan257 | |
| Fractured rear hydraulic damper bracket and the requirement for a protective shield. | 25th Sep 1926 | Box 55 \ 3 Scan258 | |
| Requesting viscosity figures for a sample of Mobiloil 'E' oil at various temperatures. | 27th Sep 1926 | Box 55 \ 3 Scan259 | |
| Recommendation for Gargoyle Mobiloil 'E' for use in re-filling hydraulic shock dampers. | 27th Sep 1926 | Box 55 \ 3 Scan260 | |
| Query regarding the lack of maintenance and upkeep instructions for hydraulic shock absorbers. | 29th Sep 1926 | Box 55 \ 3 Scan261 | |
| Responding to a report of oil leakage from front shock absorbers, discussing potential causes and solutions. | 29th Sep 1926 | Box 55 \ 3 Scan262 | |
| Vehicle suspension performance, damper settings, and road testing methodologies. | 29th Sep 1926 | Box 55 \ 3 Scan263 | |
| Vehicle wobbles, suspension qualities, tyre types, and hydraulic dampers. | 29th Sep 1926 | Box 55 \ 3 Scan264 | |
| Standard test procedure for measuring rear riding comfort using water spillage from a container. | 25th Jun 1926 | Box 55 \ 3 Scan265 | |
| The testing procedures for hydraulic shock dampers. | 25th Jun 1926 | Box 55 \ 3 Scan266 | |
| Instructions for checking and dismantling leaking glands after a road test. | 22th Sep 1926 | Box 55 \ 3 Scan267 | |
| Laboratory report on the properties and viscosity of a compressor oil sample. | 22th Sep 1926 | Box 55 \ 3 Scan268 | |
| Issuance of information and future notes on hydraulic shock absorbers. | 30th Sep 1926 | Box 55 \ 3 Scan269 | |
| Recommendation to send spare packings and caps for hydraulic shock dampers to depots for replacement and testing. | 30th Sep 1926 | Box 55 \ 3 Scan270 | |
| Issuing preliminary instructions for hydraulic shock dampers to the Depots. | 2nd Oct 1926 | Box 55 \ 3 Scan271 | |
| Recommendations for customers on the maintenance and refilling of hydraulic shock dampers. | 2nd Oct 1926 | Box 55 \ 3 Scan272 | |
| The rigging of a front hydraulic steering damper. | 2nd Oct 1926 | Box 55 \ 3 Scan273 | |
| Circulating maintenance information on hydraulic shock dampers. | 5th Oct 1926 | Box 55 \ 3 Scan274 | |
| Maintenance and pressure testing instructions for hydraulic shock dampers, focusing on gland re-packing. | 1st Oct 1926 | Box 55 \ 3 Scan275 | |
| Instructions and diagram for pressure testing shock dampers for oil leaks. | 1st Oct 1926 | Box 55 \ 3 Scan276 | |
| Instructions for shock damper maintenance, oil filling, and load specifications. | 1st Sep 1926 | Box 55 \ 3 Scan277 | |
| Laboratory report detailing the specific gravity, flash point, acidity, and viscosity of a compressor oil sample. | 1st Sep 1926 | Box 55 \ 3 Scan278 | |
| Specifying shock damper loading settings for experimental 20 HP and Phantom cars. | 6th Oct 1926 | Box 55 \ 3 Scan279 | |
| Steering wobble issues, the conflict between self-righting and irreversibility, and a proposed patentable solution using a spring on the worm shaft. | 6th Oct 1926 | Box 55 \ 3 Scan280 | |
| Despatch of a broken rear hydraulic shock damper suspending bracket. | 7th Oct 1926 | Box 55 \ 3 Scan281 | |
| Confirming a telephonic conversation about fitting a car with hydraulic dampers, well base wheels, and tyres. | 8th Oct 1926 | Box 55 \ 3 Scan282 | |
| Testing of production glands and packing for hydraulic shock dampers, and proposing further tests with different spring and packing combinations. | 1st Oct 1926 | Box 55 \ 3 Scan283 | |
| Requesting an order of stronger springs for the front hydraulic shock damper for experimental purposes on 40/50 HP and 20 HP chassis. | 12th Oct 1926 | Box 55 \ 3 Scan284 | |
| Audible knock caused by hydraulic shock dampers. | 12th Oct 1926 | Box 55 \ 3 Scan285 | |
| The procurement of softer packings for experimental hydraulic shock dampers. | 12th Oct 1926 | Box 55 \ 3 Scan286 | |
| Excessive wear on hydraulic shock damper bushes and proposing a material change to hardened steel. | 19th Oct 1926 | Box 55 \ 3 Scan287 | |
| Standardisation of front hydraulic shock dampers. | 23th Sep 1926 | Box 55 \ 3 Scan288 | |
| Cost difference for standardising front hydraulic shock dampers. | 4th Oct 1926 | Box 55 \ 3 Scan289 | |
| Tests to ascertain the cause of knocks in hydraulic shock dampers, identifying end play in the lever shaft as the issue. | 25th Oct 1926 | Box 55 \ 3 Scan290 | |
| Proposals for managing friction in a new front axle, steering pivots, and clutch. | 5th Nov 1926 | Box 55 \ 3 Scan291 | |
| Letter from America to Derby discussing front shock absorbers, comparing Lovejoy, R.R. hydraulics, and Houdaille types. | 12th Nov 1926 | Box 55 \ 3 Scan292 | |
| Vehicle riding characteristics, shock absorbers, and the stiffness testing of road springs. | 12th Nov 1926 | Box 55 \ 3 Scan293 | |
| The stiffness of front springs on a new axle pad and its effect on riding. | 12th Nov 1926 | Box 55 \ 3 Scan294 | |
| Typed memo from 'R.' to 'Hs.' requesting vehicle modifications and asking technical questions. | 24th Nov 1926 | Box 55 \ 3 Scan295 | |
| Proposed front axle control system for the Phantom model, including modifications and suggestions for testing. | 14th Dec 1926 | Box 55 \ 3 Scan296 | |
| Three improvements for the Phantom steering system, concerning a pendulum lever, friction, and dampers. | 12th Jun 1926 | Box 55 \ 3 Scan297 | |
| Standardisation proposal for rear hydraulic shock dampers. | 1st Oct 1926 | Box 55 \ 3 Scan298 | |
| Trial and disadvantages of certain hydraulic shock dampers. | 10th Dec 1926 | Box 55 \ 3 Scan299 | |
| Standardization and modification of hydraulic rear dampers for the Phantom model. | 13th Dec 1928 | Box 55 \ 3 Scan300 | |
| Need for double shock absorbers on 40/50 & 20 HP cars prepared for speed. | 13th Dec 1926 | Box 55 \ 3 Scan301 | |
| Advantages and recommendation for implementing rear hydraulic dampers on the Phantom model. | 14th Dec 1926 | Box 55 \ 3 Scan302 | |
| The use of a shock damper arm as a second coupling for parallel motion on the front axle. | 17th Dec 1926 | Box 55 \ 3 Scan303 | |
| Performance of hydraulic dampers and rear springs on car 9-G-111. | 20th Dec 1926 | Box 55 \ 3 Scan304 | |
| Authorizing the dispatch of urgent parts for an experimental car to Conduit Street, London. | 21th Dec 1926 | Box 55 \ 3 Scan305 | |
| Ineffective rear shock absorbers causing road-holding and braking issues on a 20 HP Experimental car. | 22th Dec 1926 | Box 55 \ 3 Scan306 | |
| Modifications to the rear shock dampers for improved ground clearance. | 22th Dec 1926 | Box 55 \ 3 Scan307 | |
| Experiments and proposed modifications to the Phantom's front axle control damper lever. | 23th Dec 1926 | Box 55 \ 3 Scan308 | |
| Standardisation sheet regarding the battery box support and tie rod for the 20 HP model. | 29th Dec 1926 | Box 55 \ 3 Scan309 | |
| Notice to stop work on damper schemes 2293/4 and 2323 due to the introduction of a new, modified design. | 29th Dec 1926 | Box 55 \ 3 Scan310 | |
| Request to arrange a rear hydraulic damper with specific springs and to check the resulting loading. | 30th Dec 1926 | Box 55 \ 3 Scan311 | |
| Request for the production and fitting of high pressure valve springs for a rear hydraulic shock damper on an experimental 40/50 chassis. | 6th Jan 1927 | Box 55 \ 4 Scan001 | |
| Instructions to produce and fit a new High Pressure Valve Spring for the front hydraulic shock damper on the 20-HP chassis. | 13th Jan 1927 | Box 55 \ 4 Scan002 | |
| Proposal to experimentally try a spring-controlled ball at the apex of the torque arm to minimise wear and obviate issues with the spring. | 17th Nov 1927 | Box 55 \ 4 Scan003 | |
| Comparing two shock damper springs to achieve a required load of 80 lbs. | 19th Jan 1927 | Box 55 \ 4 Scan004 | |
| Suitability of leather covers for rear hydraulic connecting links, proposing a metal alternative. | 27th Jan 1927 | Box 55 \ 4 Scan005 | |
| The reduction of front braking and checking for obsolete hydraulic dampers on experimental 40/50 HP cars. | 28th Jan 1927 | Box 55 \ 4 Scan006 | |
| Load testing and selection of a suitable rear shock damper spring for the Phantom Chassis. | 31th Jan 1927 | Box 55 \ 4 Scan007 | |
| Testing of spring F.75148 and recommending the use of aluminium washers to adjust for variations in shock absorbers. | 2nd Feb 1927 | Box 55 \ 4 Scan008 | |
| Proposal to modify the steering shock damper by adding bye-passes to facilitate shunting. | 1st Feb 1927 | Box 55 \ 4 Scan009 | |
| Advantages and considerations of hydraulic damping for steering systems. | 1st Feb 1927 | Box 55 \ 4 Scan010 | |
| High-pressure valve spring for the Phantom Chassis rear hydraulic shock damper. | 2nd Feb 1927 | Box 55 \ 4 Scan011 | |
| Mr. Royce's suggestion to experimentally fit both standard hydraulic and Hartford shock absorbers onto fast cars. | 1st Feb 1927 | Box 55 \ 4 Scan012 | |
| Modification to hydraulic shock dampers to eliminate a hydraulic knock. | 9th Feb 1927 | Box 55 \ 4 Scan013 | |
| Audible knock in the hydraulic shock damper caused by wear and proposing a redesign of the lever bearings. | 1st Feb 1927 | Box 55 \ 4 Scan014 | |
| Knock from wear and tear, and a test to reduce it by pressure-feeding oil to damper bearings. | 1st Feb 1927 | Box 55 \ 4 Scan015 | |
| Blueprint showing a cross-section of a shaft and bearing assembly. | 10th Feb 1927 | Box 55 \ 4 Scan016 | |
| Cause and potential cure for knocks in hydraulic shock dampers. | 10th Feb 1927 | Box 55 \ 4 Scan017 | |
| Proposals for steering system improvements and experimental trials. | 10th Feb 1927 | Box 55 \ 4 Scan018 | |
| Design suggestions for hydraulic dampers and 20 HP steering geometry, highlighting workload issues. | 10th Feb 1927 | Box 55 \ 4 Scan019 | |
| Severe test for steel bushed shock dampers on vehicle 10-G-111. | 10th Feb 1927 | Box 55 \ 4 Scan020 | |
| Agreement form suggesting an alteration to Depot Sheet No. 22 regarding the interchangeability of dampers on different axle type cars. | 2nd Feb 1927 | Box 55 \ 4 Scan021 | |
| Modifications to hydraulic shock damper bearings to overcome operational issues. | 15th Feb 1927 | Box 55 \ 4 Scan022 | |
| Proposal for a variable hydraulic shock damper and steering system, controllable manually by the driver or automatically. | 16th Feb 1927 | Box 55 \ 4 Scan023 | |
| Request to resolve an issue with fitting a spring-loaded gland on a 20 HP rear hydraulic damper, as it fouls the brake rope. | 16th Feb 1927 | Box 55 \ 4 Scan024 | |
| Experiments with forced lubrication on hydraulic shock dampers and the resulting issue of making the gland oil-tight. | 21th Feb 1927 | Box 55 \ 4 Scan025 | |
| Modified instructions for shock absorber settings and their demonstration. | 1st Feb 1927 | Box 55 \ 4 Scan026 | |
| Guide to shock absorber settings and a troubleshooting table for suspension issues. | 1st Feb 1927 | Box 55 \ 4 Scan027 | |
| Instructions for adjusting and checking the loading of front and rear shock absorbers. | 25th Feb 1927 | Box 55 \ 4 Scan028 | |
| Proposal for fitting Hartford shock absorbers to the front axle of the 10-EX model. | 25th Feb 1927 | Box 55 \ 4 Scan029 | |
| Arrangement of combined Hartford and hydraulic dampers on high-speed cars. | 4th Mar 1927 | Box 55 \ 4 Scan030 | |
| Diagrammatic sketches for provisional patents on hydraulic dampers with variable pressure. | 4th Mar 1927 | Box 55 \ 4 Scan031 | |
| | | | |
