| Description | Date | Identifier | |
| Decision to increase the rating of 'SS' springs by 10% due to them being too flexible. | 10th Apr 1929 | Box 16 \ 7 Scan165 | |
| Comparative stiffness, deflection, and rating of 'SS' springs versus the standard 40/50 HP springs. | 11th Apr 1929 | Box 16 \ 7 Scan166 | |
| Modified lubrication holes and grooves in road springs for the 'SS' Chassis to cure squeaking. | 15th Apr 1929 | Box 16 \ 7 Scan167 | |
| Modifications to road springs, focusing on drilling, grooving, and oiling methods. | 16th Apr 1929 | Box 16 \ 7 Scan168 | |
| Design and lubrication of road springs, proposing the use of extra flexible tips. | 17th Apr 1929 | Box 16 \ 7 Scan169 | |
| Requesting to fit specific front and rear springs to chassis 23-EX, detailing the required poundage after treatment. | 1st Apr 1929 | Box 16 \ 7 Scan170 | |
| Letter regarding new parts and suspension testing for the 22-EX experimental car. | 23th Apr 1929 | Box 16 \ 7 Scan171 | |
| Continuation of instructions for vehicle testing, detailing ballast, shock absorber, and steering settings. | 13th May 1929 | Box 16 \ 7 Scan172 | |
| Poundage modifications for axle springs on the J.2 Series Chassis. | 13th May 1929 | Box 16 \ 7 Scan173 | |
| Recommendation for S.S. road spring percentages and material for the next 50 sets. | 14th May 1929 | Box 16 \ 7 Scan174 | |
| Experiments with drilled valves in shock absorbers to improve riding quality and comparing a Chrysler to a Phantom. | 14th May 1929 | Box 16 \ 7 Scan175 | |
| Vehicle suspension and ride comfort, comparing different body types and weight distributions for driving on continental roads. | 14th May 1929 | Box 16 \ 7 Scan176 | |
| Suspension components, including road springs, gaiters, and shock absorbers, to improve ride comfort. | 14th May 1929 | Box 16 \ 7 Scan177 | |
| Shock absorber testing, detailing load settings and observations on ride quality. | 14th May 1929 | Box 16 \ 7 Scan178 | |
| Shock absorber loadings and drilled valves to achieve a good ride. | 29th May 1929 | Box 16 \ 7 Scan179 | |
| Urgent internal request for various car springs to be cadmium plated and grooved. | 29th May 1929 | Box 16 \ 7 Scan180 | |
| Letter from Rolls-Royce of America to Derby discussing riding quality, weight distribution, and spring oiling. | 31th May 1929 | Box 16 \ 7 Scan181 | |
| Letter to Mr. Robotham discussing the development of a Castor oil scraper ring, including a diagram. | 21th May 1929 | Box 16 \ 7 Scan182 | |
| List of springs fitted to experimental cars with corresponding complete car weights. | 1st Jun 1929 | Box 16 \ 7 Scan183 | |
| Request to prepare a bumper chassis for testing new improved spring grooving, a new exhaust system, engine mounting and frame cross members. | 18th Jun 1929 | Box 16 \ 7 Scan184 | |
| Suggestion memo regarding buffer clearances and specifications for fitting springs. | 1st Jun 1929 | Box 16 \ 7 Scan185 | |
| Recommending road spring loads for chassis nos. 1-WJ and 14-WJ, based on the weight of an 18-EX body. | 1st Jun 1929 | Box 16 \ 7 Scan186 | |
| Urgent request for two modified SS front springs with specific camber requirements for experimental work. | 28th Jun 1929 | Box 16 \ 7 Scan187 | |
| Cost and effectiveness of the current manufacturing method for road springs. | 23th Jul 1929 | Box 16 \ 7 Scan188 | |
| Instructions for providing a lubrication scheme on 40/50 HP Chassis 'J-2' Series road springs. | 26th Jul 1929 | Box 16 \ 7 Scan189 | |
| Production car modifications for S.S. Cars, covering road spring pillars, servo lining, thermostats, and exhaust fittings. | 26th Jul 1929 | Box 16 \ 7 Scan190 | |
| Recommended modifications for S.S. cars concerning steering and lubrication. | 8th Aug 1929 | Box 16 \ 7 Scan191 | |
| Secret internal memorandum regarding an urgent conference to discuss the manufacturing method of S.S. Springs and the need to cut expenses. | 8th Aug 1929 | Box 16 \ 7 Scan192 | |
| Converting experimental chassis road spring groovings to the production standard. | 20th Mar 1923 | Box 16 \ 7 Scan193 | |
| Proposal for using stiffer road springs on the Phantom II sports car. | 9th Oct 1939 | Box 16 \ 7 Scan194 | |
| Vehicle spring weights, durability, and potential weight savings. | 21th Oct 1929 | Box 16 \ 7 Scan195 | |
| Expenses for the Phantom II, specifically concerning Firth's prices and a £6,000 payment. | 21th Oct 1929 | Box 16 \ 7 Scan196 | |
| Road spring prices and manufacturing methods for the Phantom I and Phantom II. | 19th Oct 1929 | Box 16 \ 7 Scan197 | |
| Price increases and manufacturing specifications of springs for Phantom I and Phantom II cars. | 23th Oct 1929 | Box 16 \ 7 Scan198 | |
| The life and performance of road springs, comparing different designs and the impact of hydraulic shock absorbers. | 23th Oct 1929 | Box 16 \ 7 Scan199 | |
| Use of a hollow rolled plate and an 'exerciser' to improve spring bedding and reduce manufacturing costs. | 24th Oct 1929 | Box 16 \ 7 Scan200 | |
| The Phantom II sports car rear springs, discussing proposed changes and weight savings. | 24th Oct 1929 | Box 16 \ 7 Scan201 | |
| The differences between American and English car springing, discussing damping, spring plates, and potential future controllable systems. | 26th Oct 1929 | Box 16 \ 7 Scan202 | |
| The springing and shock absorber performance of the Phantom II chassis. | 18th Feb 1929 | Box 16 \ 7 Scan203 | |
| Chassis spring settings and recommending modifications. | 21th Nov 1929 | Box 16 \ 7 Scan204 | |
| The springing of the Phantom II chassis and arranging a follow-up meeting in Derby. | 21th Nov 1929 | Box 16 \ 7 Scan205 | |
| Springing and shock absorber setup for the Phantom II chassis based on extensive road tests. | 21th Nov 1929 | Box 16 \ 7 Scan206 | |
| Phantom II hydraulic shock absorbers, their loading limits, and a response to a customer complaint. | 21th Nov 1929 | Box 16 \ 7 Scan207 | |
| The cost, finish, and design of Phantom II road springs compared to the Phantom I. | 26th Nov 1929 | Box 16 \ 7 Scan208 | |
| Letter discussing the springing of the Phantom II chassis and proposing further tests to improve riding quality. | 28th Feb 1929 | Box 16 \ 7 Scan209 | |
| Cost reduction and manufacturing improvements for Phantom II springs with supplier Firth's. | 7th Dec 1929 | Box 16 \ 7 Scan210 | |
| Cover memo discussing an attached report on efforts to prevent breakages and reduce costs, with continued work involving Firth's. | 7th Dec 1929 | Box 16 \ 7 Scan211 | |
| Finish, manufacturing process, and failure analysis of Phantom II springs. | 8th Dec 1929 | Box 16 \ 7 Scan212 | |
| Design alternatives for the Phantom II rear springs and clips to reduce production costs. | 7th Dec 1929 | Box 16 \ 7 Scan213 | |
| Complaint about squeaky springs on a Phantom 11 car due to incorrect lubrication. | 7th Dec 1929 | Box 16 \ 7 Scan214 | |
| The springing on the Phantom II model, advising against unnecessary spring changes. | 14th Dec 1929 | Box 16 \ 7 Scan215 | |
| Complaint about Phantom II springing issues related to the lanoline treatment process after cadmium plating. | 17th Dec 1929 | Box 16 \ 7 Scan216 | |
| Improvements to the Phantom II's riding comfort, focusing on tyre pressure, spring bedding, and shock absorbers. | 1st Jan 1930 | Box 16 \ 7 Scan217 | |
| Internal order specifying dimensions for Phantom II front and rear road springs for chassis 23-EX. | 6th Jan 1930 | Box 16 \ 7 Scan218 | |
| Modification and testing of rear road springs for the 40/50 HP Phantom II chassis. | 14th Jan 1930 | Box 16 \ 7 Scan219 | |
| Review of Messrs. Firths' spring drawing, detailing required modifications for the rear spring. | 14th Jan 1930 | Box 16 \ 7 Scan220 | |
| Letter to a supplier regarding specifications for special experimental Phantom II rear springs. | 16th Jan 1930 | Box 16 \ 7 Scan221 | |
| Cover letter regarding a communication from a supplier about axle springs for Chassis 23-EX. | 22th Jan 1930 | Box 16 \ 7 Scan222 | |
| Proportions of axle springs for model 23-EX with Firth's spring designer. | 22th Jan 1930 | Box 16 \ 7 Scan223 | |
| Letter to a supplier regarding specifications and delivery of plate springs. | 23th Jan 1930 | Box 16 \ 7 Scan224 | |
| Confirming a settlement with Firth's for the supply of springs to be made to an attached drawing. | 28th Jan 1930 | Box 16 \ 7 Scan225 | |
| Substitution of a rolled eye for a solid eye on the Phantom II Rear Axle Spring to reduce costs. | 4th Feb 1930 | Box 16 \ 7 Scan226 | |
| Requesting instructions for the inter-leaved lubrication of Sports Car road springs made by Firth's. | 25th Feb 1930 | Box 16 \ 7 Scan227 | |
| Modifying front road springs by removing leaves for a test on the S.S. car. | 12th Mar 1930 | Box 16 \ 7 Scan228 | |
| Recommendation on the positioning of clips on rolled eye rear springs to ensure proper bedding. | 14th Mar 1930 | Box 16 \ 7 Scan229 | |
| Blueprint diagram for a rolled eye 40/50 rear spring with measurements. | 14th May 1930 | Box 16 \ 7 Scan230 | |
| Almost entirely illegible document bearing a 'Print Room' stamp from Derby. | 14th May 1930 | Box 16 \ 7 Scan231 | |
| Modifications to the road springs for the Phantom II Sports Car (23-EX). | 20th Mar 1930 | Box 16 \ 7 Scan232 | |
| Tests investigating radiator 'jellying' by adjusting front springs and shock absorbers on various chassis. | 27th Mar 1930 | Box 16 \ 7 Scan233 | |
| Report page discussing the effect of torque reaction dampers on radiator 'jelly'ing'. | 1st Apr 1930 | Box 16 \ 7 Scan234 | |
| Complaints regarding the springing on Phantom II cars, specifically issues with bumping on the rear buffers. | 1st Apr 1930 | Box 16 \ 7 Scan235 | |
| Log of complaints and fixes for weak rear springs on the Phantom 11 model. | 4th Apr 1930 | Box 16 \ 7 Scan236 | |
| Standardisation of Phantom II rear axle springs and ordering 40/50 HP springs from Messrs. Firth. | 4th Apr 1930 | Box 16 \ 7 Scan237 | |
| Substitution of a rolled eye for a solid eye on the Phantom II Rear Axle Spring to reduce costs. | 4th Feb 1930 | Box 16 \ 7 Scan238 | |
| Application of the Bijur lubrication system to a front axle, suggesting the retention of drip plugs. | 10th Apr 1930 | Box 16 \ 7 Scan239 | |
| Order request for a set of stiffer type road springs for experimental use on Major Segrave's car. | 12th Apr 1930 | Box 16 \ 7 Scan240 | |
| Suspension tests on the Phantom II, focusing on front spring stiffness to resolve 'jellying' and pitching issues. | 12th Apr 1930 | Box 16 \ 7 Scan241 | |
| Blueprint for the rear road springs of a Phantom II Sports Car (23-EX). | 24th Apr 1930 | Box 16 \ 7 Scan242 | |
| Series of recommendations on springs, damping, and tyre pressures for Phantom II and 25 HP models. | 4th May 1930 | Box 16 \ 7 Scan243 | |
| Advantages and disadvantages of stiffer springs for the Phantom 11 and 20 HP models. | 14th May 1930 | Box 16 \ 7 Scan244 | |
| Analysis of customer complaints regarding rear seat ride quality, specifically low speed dithering and pitching issues. | 14th May 1930 | Box 16 \ 7 Scan245 | |
| Vehicle suspension issues, discussing spring ratings, deflection complaints, and potential compromises. | 14th May 1930 | Box 16 \ 7 Scan246 | |
| Poor road holding at high speeds and potential improvements to front suspension. | 14th May 1930 | Box 16 \ 7 Scan247 | |
| Results of fitting new lower rated front and stronger rear springs to chassis 82-AL. | 5th May 1930 | Box 16 \ 7 Scan248 | |
| Letter discussing the spring performance and axle weights of a Phantom II vehicle on various road conditions. | 15th May 1930 | Box 16 \ 7 Scan249 | |
| Ongoing 'Springing Complaints' for the Phantom I and the newly introduced Phantom II models. | 15th May 1930 | Box 16 \ 7 Scan250 | |
| List of customer complaints regarding suspension issues on the Phantom II model. | 8th May 1930 | Box 16 \ 7 Scan251 | |
| List of past customer complaints regarding vehicle suspension and handling issues. | 15th May 1930 | Box 16 \ 7 Scan252 | |
| Suggestion for front springs with two ratings and its application to the Phantom II model. | 15th May 1930 | Box 16 \ 7 Scan253 | |
| Order specification for a pair of special low rating front springs for the Phantom II. | 19th May 1930 | Box 16 \ 7 Scan254 | |
| Two lists of complaints regarding vehicle springing. | 19th May 1930 | Box 16 \ 7 Scan255 | |
| List of customer complaints regarding Phantom II springing issues, specifically bumping on buffers. | 19th May 1930 | Box 16 \ 7 Scan256 | |
| Log of vehicle suspension issues and remedies for specific chassis. | 8th May 1930 | Box 16 \ 7 Scan257 | |
| Hard riding issue and the proposed solution of drilling HP valves in shock absorbers. | 8th May 1930 | Box 16 \ 7 Scan258 | |
| List of springing complaints and repairs for Phantom II chassis. | 17th May 1930 | Box 16 \ 7 Scan259 | |
| Springing specifications for the Phantom II, in response to a memo from the Paris Depot. | 21th May 1930 | Box 16 \ 7 Scan260 | |
| Urgent memo regarding an epidemic of weak springing on 25 HP and Phantom II chassis, with recommendations for fitting stronger springs. | 15th May 1930 | Box 16 \ 7 Scan261 | |
| Customer complaints regarding the riding qualities and springing of the Phantom II and 25 HP models. | 23th May 1930 | Box 16 \ 7 Scan262 | |
| Shock absorber and spring testing for vehicle ride comfort. | 23th May 1930 | Box 16 \ 7 Scan263 | |
| Valve usage on the Phantom II, chassis improvements, and ride comfort issues on the 20 HP model. | 23th May 1930 | Box 16 \ 7 Scan264 | |
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