| Description | Date | Identifier | |
| Distributing standardisation sheets for experiments on rear springs, a luggage bracket, and a back axle. | 20th Aug 1920 | Box 80 \ 2 scan0195 | |
| Comparison of the springing and riding characteristics between car models 1.EX and 6.EX. | 20th Aug 1920 | Box 80 \ 2 scan0196 | |
| Front bumper test report detailing Brinell hardness results for an 11-leaf spring. | 14th Oct 1928 | Box 80 \ 2 scan0197 | |
| Log sheet detailing the results and failures during a bumper and spring endurance test. | 30th Aug 1920 | Box 80 \ 2 scan0198 | |
| Log sheet detailing component failures, maintenance activities, and replacements against total run hours. | 26th Aug 1920 | Box 80 \ 2 scan0199 | |
| Front buffer spring test report, detailing Brinell hardness and run time. | 22th Sep 1920 | Box 80 \ 2 scan0200 | |
| Visit to Jonas Woodhead & Sons Ltd. concerning the production and delivery of chassis rear road springs. | 30th Aug 1920 | Box 80 \ 2 scan0201 | |
| Technical bulletin regarding the cause and cure for squeaking rear leaf springs. | 30th Aug 1920 | Box 80 \ 2 scan0202 | |
| The work carried out on the 1.EX Car before dispatch. | 31th Aug 1920 | Box 80 \ 2 scan0203 | |
| Standardisation sheets for various vehicle parts. | 1st Sep 1920 | Box 80 \ 2 scan0204 | |
| Cause and potential remedies for squeaking leaf springs. | 9th Sep 1920 | Box 80 \ 2 scan0205 | |
| Methods for greasing and protecting car springs to reduce noise and wear. | 3rd Sep 1920 | Box 80 \ 2 scan0206 | |
| Forwarding correspondence regarding rear springs from supplier Jonas Woodhead & Sons Ltd. | 6th Sep 1920 | Box 80 \ 2 scan0207 | |
| Test report on Ferodo interleaving material fitted to the springs of an experimental car and its effect on axle dithering. | 7th Sep 1920 | Box 80 \ 2 scan0208 | |
| Testing methods for leaf springs, comparing greasing against using interleaving material. | 1st Sep 1920 | Box 80 \ 2 scan0209 | |
| Extract discussing steering wobble and transmission knock issues in present production cars. | 7th Sep 1920 | Box 80 \ 2 scan0210 | |
| Extract discussing transmission design choices, torque tubes, and electrical installation schemes including starter and ignition systems. | 7th Sep 1920 | Box 80 \ 2 scan0211 | |
| Standardisation of chassis parts, specifically pre-war thin leaf type rear road springs. | 20th Aug 1920 | Box 80 \ 2 scan0212 | |
| Lubrication of road springs and modifications to rear shock dampers for improved ride quality. | 10th Sep 1920 | Box 80 \ 2 scan0213 | |
| Ferodo interleaving for springs and suggesting alternative materials and designs. | 10th Sep 1920 | Box 80 \ 2 scan0214 | |
| Log sheet for a bump test on a front chassis, detailing issues with suspension and other components over time. | 2nd Oct 1920 | Box 80 \ 2 scan0215 | |
| Bumper test report for a front spring, detailing Brinell hardness results and failure analysis for each leaf. | 21th Sep 1920 | Box 80 \ 2 scan0216 | |
| Tests conducted on the 6.EX car to determine the effect of rear shock absorbers with different tyre pressures. | 22th Sep 1920 | Box 80 \ 2 scan0217 | |
| Test results of rear shock absorbers, including noise issues, potential solutions using Ferodo Discs, and recommendations for their use. | 22th Sep 1920 | Box 80 \ 2 scan0218 | |
| Bumper test results for a 10-leaf spring, detailing Brinell hardness, run time, and failure points. | 7th Oct 1920 | Box 80 \ 2 scan0219 | |
| Results of Brinell hardness tests on various spring leaves. | 19th Jul 1917 | Box 80 \ 2 scan0220 | |
| Test report for a 10-leaf front chassis spring (F.4629), detailing Brinell hardness, test results, and duration. | 29th Sep 1920 | Box 80 \ 2 scan0221 | |
| From Mr. Royce detailing his autumn road test of experimental car 1.EX and comments on production cars and road conditions. | 26th Sep 1920 | Box 80 \ 2 scan0222 | |
| Improving ride comfort through adjustments to tyres, springs, and axle ratios. | 26th Sep 1920 | Box 80 \ 2 scan0223 | |
| Car performance, issues with a Hawk aero engine, and recommendations for suspension and electrical improvements. | 26th Sep 1920 | Box 80 \ 2 scan0224 | |
| Rear springing of cars, addressing weight discrepancies, damping issues, and the influence of tyre manufacturing changes. | 28th Sep 1920 | Box 80 \ 2 scan0225 | |
| Test report for a 10-leaf spring, detailing Brinell hardness and endurance test results. | 7th Oct 1920 | Box 80 \ 2 scan0226 | |
| Investigating a knocking issue from the rear spring and axle, detailing customer complaints, test findings, and proposing two potential solutions. | 30th Sep 1920 | Box 80 \ 2 scan0227 | |
| Necessity of sideways clearance for a spring and roller assembly to prevent binding. | 30th Sep 1920 | Box 80 \ 2 scan0228 | |
| Test report detailing the results of bumper spring tests on a front chassis. | 1st Oct 1920 | Box 80 \ 2 scan0229 | |
| Tests comparing oil type thin leaf springs with present thick leaf springs on a 40/50 chassis. | 10th Oct 1920 | Box 80 \ 2 scan0230 | |
| The comparison between thin and thick leaf springs, considering performance, reliability, and customer feedback. | 10th Oct 1920 | Box 80 \ 2 scan0231 | |
| Continued memorandum discussing the issue of overly stiff car springs and correct weight specifications. | 10th Oct 1920 | Box 80 \ 2 scan0232 | |
| Spring testing for the 40/50 chassis, comparing ride quality with different springs and the effect of shock absorbers. | 7th Oct 1920 | Box 80 \ 2 scan0233 | |
| Test report on a front bumper, new engine rear suspension brackets, and Dunlop wire wheels with 72 spokes. | 7th Oct 1920 | Box 80 \ 2 scan0234 | |
| Vehicle issues including suspension springing, steering wobbles, and spark plug overoiling. | 6th Oct 1920 | Box 80 \ 2 scan0235 | |
| Vehicle suspension issues, including springs, shock absorbers, wobbles, and tyres, particularly in relation to American roads. | 7th Oct 1920 | Box 80 \ 2 scan0236 | |
| List of vehicle faults and points for discussion, page 2. | 7th Oct 1920 | Box 80 \ 2 scan0237 | |
| Report discussing vehicle springing, wobbles, and tyre performance issues. | 7th Oct 1920 | Box 80 \ 2 scan0238 | |
| List of vehicle faults and observations for discussion. | 10th Oct 1920 | Box 80 \ 2 scan0239 | |
| Forwarding a cablegram from Mr. Platford about a complaint regarding American springing and shock absorbers. | 10th Oct 1920 | Box 80 \ 2 scan0240 | |
| Comparison of axle ratio, springs, and shock absorbers for specific car models. | 9th Oct 1920 | Box 80 \ 2 scan0241 | |
| Copy telegram regarding a cable received about obtaining and fitting springs. | 15th Oct 1920 | Box 80 \ 2 scan0242 | |
| Jumper test report for a front chassis, detailing the performance and failure of various leaf springs. | 15th Oct 1920 | Box 80 \ 2 scan0243 | |
| New type of spring with a gunmetal hoop, noting its rough finish and offering it for testing purposes. | 23th Oct 1920 | Box 80 \ 2 scan0244 | |
| Cost versus benefit of grinding all the leaves on rear springs. | 25th Oct 1920 | Box 80 \ 2 scan0245 | |
| The design and assembly of front springs, specifically about using nibs and slots. | 27th Oct 1920 | Box 80 \ 2 scan0246 | |
| Suggesting a new wearing plate design to fix a knock in the rear axle springs. | 1st Nov 1920 | Box 80 \ 2 scan0247 | |
| Bumper test report on an 11-leaf spring, showing Brinell hardness and failures. | 5th Nov 1920 | Box 80 \ 2 scan0248 | |
| Letter discussing the 'King's Patent Spring Oiler', accompanied by a leaflet and a sample. | 8th Nov 1920 | Box 80 \ 2 scan0249 | |
| Fitting of thin leaf springs and a friction device to the steering pivots on all American cars. | 9th Nov 1920 | Box 80 \ 2 scan0250 | |
| From CJ to EP regarding a telephone message from Mr. Royce and the subsequent need to send cables to America. | 8th Nov 1920 | Box 80 \ 2 scan0251 | |
| Telephone message from R. to CJ regarding front pivot friction washers and road springs. | 6th Nov 1920 | Box 80 \ 2 scan0252 | |
| Points for attention for American post-war cars following a visit. | 11th Nov 1920 | Box 80 \ 2 scan0253 | |
| Petrol system issues, spring shackle clearances, and sheet nickel silver for radiators. | 11th Nov 1920 | Box 80 \ 2 scan0254 | |
| Copy of a cable to Springfield regarding a changeover of springs for certain vehicle types. | 26th Nov 1920 | Box 80 \ 2 scan0255 | |
| Test report on an 11-leaf bumper, detailing Brinell hardness and endurance test results. | 26th Nov 1920 | Box 80 \ 2 scan0256 | |
| Log sheet detailing the results of a bumper test, including component failures and run times. | 23th Nov 1920 | Box 80 \ 2 scan0257 | |
| Review of the increasing cost of materials for the 40/50 HP chassis, comparing current costs to pre-war figures. | 23th Nov 1920 | Box 80 \ 2 scan0258 | |
| The cost and quality of raw materials like copper and spelter, and the future pricing trends. | 23th Nov 1920 | Box 80 \ 2 scan0259 | |
| Faulty lubrication in the double swivel front link for cantilever springs. | 10th Dec 1920 | Box 80 \ 2 scan0260 | |
| The alteration of back springs and new mandatory testing procedures for cars. | 17th Feb 1920 | Box 80 \ 2 scan0261 | |
| Proposal to revert to tapered-end rear leaf springs from the current bent-end design to improve ride quality and reduce squeaking. | 5th Mar 1920 | Box 80 \ 2 scan0262 | |
| Modifications to spring plates, friction, and reverting to a previous rear spring design. | 5th Mar 1920 | Box 80 \ 2 scan0263 | |
| Requesting the production of a new style of rear spring with thinned ends and ferodo strips. | 4th Apr 1920 | Box 80 \ 2 scan0264 | |
| Outlining instructions for testing three different designs of road springs. | 19th Apr 1920 | Box 80 \ 2 scan0265 | |
| Typed memorandum discussing modifications to road springs, including clips and plate ends. | 19th Apr 1920 | Box 80 \ 2 scan0266 | |
| Extract listing parts to be fitted to a car for West Wittering. | 19th Apr 1920 | Box 80 \ 2 scan0267 | |
| Testing of Ferodo material for the bedding of sheared road springs. | 28th Apr 1920 | Box 80 \ 2 scan0268 | |
| Query regarding the design and performance of rear springs to prevent squeaking. | 20th May 1920 | Box 80 \ 2 scan0269 | |
| 30-hour bumping rig test of new road springs from Messrs. Woodhead. | 21th May 1920 | Box 80 \ 2 scan0270 | |
| Querying the status of supplying non-split type rear springs for a trials car. | 27th May 1920 | Box 80 \ 2 scan0271 | |
| Specifications for special road springs fitted to car 49-GB, with details for Near Side and Off Side. | 28th May 1920 | Box 80 \ 2 scan0272 | |
| Delay and a list of new parts being fitted to the 6.EX car. | 28th May 1920 | Box 80 \ 2 scan0273 | |
| Car modifications including a luggage grid and an analysis of rear spring mechanics. | 31th May 1920 | Box 80 \ 2 scan0274 | |
| Typed memorandum discussing the use of different materials, such as sheet brass, between plates to prevent seizure. | 31th May 1920 | Box 80 \ 2 scan0275 | |
| Bumper test log sheet detailing chassis running hours and observed failures on rear springs and shock absorbers. | 2nd Jun 1920 | Box 80 \ 2 scan0276 | |
| The squeaking of chassis rear springs, a proposed design change, and testing of Ferodo inter-leaving material. | 8th Jun 1920 | Box 80 \ 2 scan0277 | |
| Letter from Ferodo Limited concerning the performance and inspection of spring interleaving material. | 1st Jun 1920 | Box 80 \ 2 scan0278 | |
| The production status and delivery of various types of rear springs from supplier Jonas Woodhead & Sons Ltd. | 1st Jun 1920 | Box 80 \ 2 scan0279 | |
| Test report on rear road springs detailing issues with cracked leaves after a 36-hour bump rig test. | 1st Jun 1920 | Box 80 \ 2 scan0280 | |
| The performance of standard and modified springs, including a test of Ferodo strips. | 3rd Jun 1920 | Box 80 \ 2 scan0281 | |
| Design and urgent procurement of rear springs for Mr. Royce's car from the supplier Woodheads. | 10th Jun 1920 | Box 80 \ 2 scan0282 | |
| Report comparing bumping rig test results for two different designs of rear leaf springs, detailing failures in one type. | 10th Jun 1920 | Box 80 \ 2 scan0283 | |
| Continued page of a document detailing stress on plates. | 1st Jun 1920 | Box 80 \ 2 scan0284 | |
| The mathematical investigation and stress testing of rear road springs. | 11th Jun 1920 | Box 80 \ 2 scan0285 | |
| Incorrect thickness of chassis rear springs received for Mr. Royce's car and requesting an order for new sets. | 14th Jun 1920 | Box 80 \ 2 scan0286 | |
| Correspondence regarding an error in the thickness of special tapered rear springs from supplier Messrs. Woodheads. | 15th Jun 1920 | Box 80 \ 2 scan0287 | |
| Correspondence regarding a misinterpretation of a drawing for thin-ended springs during a 10,000-mile standardisation test. | 14th Jun 1920 | Box 80 \ 2 scan0288 | |
| Report following a visit to supplier Jonas Woodhead & Sons Ltd. regarding spring requirements and production. | 15th Jun 1920 | Box 80 \ 2 scan0289 | |
| Advisability of allowing Woodheads to test repaired and re-built springs. | 14th Jun 1920 | Box 80 \ 2 scan0290 | |
| Modification and collection of rear springs for Mr. Royce's car from the supplier Woodheads. | 15th Jun 1920 | Box 80 \ 2 scan0291 | |
| Typed memo regarding the thickness specifications for springs at the end of a lever. | 15th Jun 1920 | Box 80 \ 2 scan0292 | |
| Reporting on the failure of a new design of thick leaf rear springs during bump rig testing. | 21th Jun 1920 | Box 80 \ 2 scan0293 | |
| Log sheet detailing failures during a bumper test on the rear of a chassis. | 25th Jun 1920 | Box 80 \ 2 scan0294 | |
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