| Description | Date | Identifier | |
| Test results for 20 HP front and rear main leaf springs, including load, camber, and stress data. | 13th May 1931 | Box 106 \ 1 scan0248 | |
| Specification sheet for the thickness of leaves on 20 HP road springs. | 13th May 1931 | Box 106 \ 1 scan0249 | |
| Unsatisfactory performance of low-rated springs on a 25 HP chassis and the necessity of adequate shock-absorber damping. | 14th May 1931 | Box 106 \ 1 scan0250 | |
| Standardisation of low-rated springs for the 20/25 HP model. | 15th May 1931 | Box 106 \ 1 scan0251 | |
| The urgent replacement of unsafe, low-rated springs on a trials car to finalise standardization. | 15th May 1931 | Box 106 \ 1 scan0252 | |
| Fitting of low-rating rear springs and shock absorbers on a 20/25 HP car. | 18th May 1931 | Box 106 \ 1 scan0253 | |
| Specification sheet for GLR-59 springing, detailing loads, camber, weights, and clearances. | 7th Mar 1931 | Box 106 \ 1 scan0254 | |
| Letter to a supplier regarding endurance tests and requested modifications for flexible road springs. | 21th May 1931 | Box 106 \ 1 scan0255 | |
| Price correction for a set of 20/25 HP road wheels to be chromium plated. | 23th May 1931 | Box 106 \ 1 scan0256 | |
| Specification sheet for a 25 HP front road spring. | 30th May 1931 | Box 106 \ 1 scan0257 | |
| Optimal free camber for front road springs and justifying the current design. | 1st Jun 1931 | Box 106 \ 1 scan0258 | |
| Altered specification for shock absorber loadings on the 25 HP model when low rating springs are fitted. | 10th Jun 1931 | Box 106 \ 1 scan0259 | |
| Damper load specifications for 20/25 HP cars with low rating springs. | 11th Jun 1931 | Box 106 \ 1 scan0260 | |
| Recommending a test with a modified high-pressure valve on the front shock absorbers for the 20/25 HP model. | 11th Jun 1931 | Box 106 \ 1 scan0261 | |
| Wide range of springing options available for the 40/50 and 25 HP cars. | 13th Jun 1931 | Box 106 \ 1 scan0262 | |
| Table outlining the range of available springs and their deflection specifications for 40/50 & 25 HP cars. | 16th Jun 1931 | Box 106 \ 1 scan0263 | |
| Specification for buffer clearances on 20/25 HP cars fitted with new low rating springs. | 16th Jun 1931 | Box 106 \ 1 scan0264 | |
| Spring alterations for a 20/25 HP Chassis GLR.81, 'R' Series, originally specified for Sir Dhunjibhoy Bomanji. | 16th Jun 1931 | Box 106 \ 1 scan0265 | |
| Confirming stock availability of low-rated road springs for model 19.G.IV. | 17th Jun 1931 | Box 106 \ 1 scan0266 | |
| Views of spring makers on a suggested type of front spring. | 17th Jun 1931 | Box 106 \ 1 scan0267 | |
| Letter from Thos Firth & Sons detailing an alternative design for 20/25 HP front flexible road springs. | 29th May 1931 | Box 106 \ 1 scan0268 | |
| Recommending to carry spare low rating front springs for the 25 HP model due to anticipated breakages on bad roads. | 17th Jun 1931 | Box 106 \ 1 scan0269 | |
| Performance issues with low-rated springs on a 20/25HP chassis and the required modification of shock absorbers. | 18th Jun 1931 | Box 106 \ 1 scan0270 | |
| Query regarding the differences in suspension and springing for various 40/50 HP chassis types and driving requirements. | 18th Jun 1931 | Box 106 \ 1 scan0271 | |
| The policy for car springing to meet various customers' special requirements and tastes. | 1st Jan 1931 | Box 106 \ 1 scan0272 | |
| Road spring design, deferring to the spring makers' expertise regarding a thicker top plate. | 20th Jun 1931 | Box 106 \ 1 scan0273 | |
| Pros and cons of different road springing types for cars. | 22th Jun 1931 | Box 106 \ 1 scan0274 | |
| Selection and testing of car springs to meet customer requirements, citing a specific chassis case. | 24th Jun 1931 | Box 106 \ 1 scan0275 | |
| Three types of springing available for Phantom II & 25 HP cars. | 25th Jun 1931 | Box 106 \ 1 scan0276 | |
| Springing of cars, fitting continental type springs, and the inclusion of additional shock absorbers for the Phantom II chassis. | 26th Jun 1931 | Box 106 \ 1 scan0277 | |
| On the springing of cars, detailing the results of fitting Hartford shock absorbers and Continental springs to a Phantom II chassis. | 27th Jun 1931 | Box 106 \ 1 scan0278 | |
| Spring types and a complaint regarding springing on Phantom II and 25 HP models. | 29th Jun 1931 | Box 106 \ 1 scan0279 | |
| Serious difficulties with the springing for the Phantom II and 25 HP models. | 10th Jul 1931 | Box 106 \ 1 scan0280 | |
| Suitability of standard and low-rating springing for Phantom II and 20/25 HP models. | 8th Jul 1931 | Box 106 \ 1 scan0281 | |
| Customer complaints regarding the springing of the Phantom II and 25 HP models. | 13th Jul 1931 | Box 106 \ 1 scan0282 | |
| Trial and supply of 'low rating' springs for the 20/25 HP model. | 24th Jul 1931 | Box 106 \ 1 scan0283 | |
| Learnings on vehicle dynamics regarding a car's center of gravity and flexible springing. | 15th Aug 1931 | Box 106 \ 1 scan0284 | |
| Spring types for the 25 HP car intended for the French market. | 17th Aug 1931 | Box 106 \ 1 scan0285 | |
| Specifications for the J.3. project covering the layout of the frame, transmission, and springs. | 9th Jul 1931 | Box 106 \ 1 scan0286 | |
| Vehicle springing and damping, discussing the potential for additional damping control on the 25 HP model. | 17th Sep 1931 | Box 106 \ 1 scan0287 | |
| Difficulty of providing a single spring and shock absorber setup for both town carriage comfort and high-speed road holding. | 8th Sep 1931 | Box 106 \ 1 scan0288 | |
| Seasonal complaints regarding vehicle springing and damping. | 8th Sep 1931 | Box 106 \ 1 scan0289 | |
| Proposing the standardization of front spring pin diameters to reduce the multiplicity of parts. | 21th Sep 1931 | Box 106 \ 1 scan0290 | |
| Implementation of flexible springs with adjustable shock dampers, considering cost and alternative designs. | 26th Sep 1931 | Box 106 \ 1 scan0291 | |
| The necessity of fitting controllable dampers to balance luxury riding with high-speed performance. | 28th Sep 1931 | Box 106 \ 1 scan0292 | |
| Proposed two-stage damper valve system and an associated oil replenishment method. | 10th Mar 1931 | Box 106 \ 1 scan0293 | |
| Schemes for rear springs, brake levers, and rear axle lubrication. | 10th Mar 1931 | Box 106 \ 1 scan0294 | |
| Proposals from Messrs. Firths for achieving economies in road spring design. | 12th Oct 1931 | Box 106 \ 1 scan0295 | |
| The challenges of determining a customer's requirements for car springing. | 13th Oct 1931 | Box 106 \ 1 scan0296 | |
| Use of solid eye versus rolled eye road springs and their impact on the frame. | 15th Oct 1931 | Box 106 \ 1 scan0297 | |
| Use, testing, and cost-effectiveness of central rolled eyes on road springs. | 16th Oct 1931 | Box 106 \ 1 scan0298 | |
| The condition of rolled eye front road springs and oil leakage from the feed pipe. | 21th Oct 1931 | Box 106 \ 1 scan0299 | |
| Springing specifications, clearances, and allowances for a 20/25 HP chassis. | 28th Oct 1931 | Box 106 \ 1 scan0300 | |
| The testing of cheaper rolled eye front springs for the 25 HP model, detailing lubrication issues and further test plans. | 29th Oct 1931 | Box 106 \ 1 scan0301 | |
| Established damper loads for the 25 HP model. | 2nd Nov 1931 | Box 106 \ 1 scan0302 | |
| Specification sheet for front and rear car spring weights for the 20/25 Hp model from Firths Springs. | 6th Nov 1931 | Box 106 \ 1 scan0303 | |
| The adjustment of low-rating spring shock absorber loads for the 25 HP model. | 12th Nov 1931 | Box 106 \ 1 scan0304 | |
| Revised damper load settings for 25 HP low rating springs. | 12th Nov 1931 | Box 106 \ 1 scan0305 | |
| Correction memo specifying the average load for rear, low rating springs for the 25 HP damper leads. | 14th Nov 1931 | Box 106 \ 1 scan0306 | |
| Standardisation and trial production of low rating springs for the Phantom and 20/25 models. | 25th Nov 1931 | Box 106 \ 1 scan0307 | |
| Use and policy of fitting low rating springs on Phantom and 25 HP models. | 30th Nov 1931 | Box 106 \ 1 scan0308 | |
| Standardisation of low rating rear road springs to improve riding comfort. | 5th May 1931 | Box 106 \ 1 scan0309 | |
| Form for the standardisation of chassis parts detailing costs, availability and an approval routing list. | 24th Nov 1938 | Box 106 \ 1 scan0310 | |
| Standardisation proposal document for low rating front road springs. | 5th May 1931 | Box 106 \ 1 scan0311 | |
| Form for the standardisation of chassis parts detailing costs and implementation. | 24th Sep 1934 | Box 106 \ 1 scan0312 | |
| Use and selection process for low rated springs on the 20/25 HP chassis. | 11th Dec 1931 | Box 106 \ 1 scan0313 | |
| Requests for sports specifications on the 25 HP model, its unsuitability for speed, and an alternative modification. | 19th Dec 1931 | Box 106 \ 1 scan0314 | |
| Requesting clarification on the fitting of stiffer springs and Hartford shock absorbers for 20/25 Cars. | 1st Jan 1932 | Box 106 \ 1 scan0315 | |
| History and specifications of the 25 HP Special Touring Saloon chassis, particularly regarding springs and shock absorbers. | 30th Dec 1931 | Box 106 \ 1 scan0316 | |
| Chassis modifications for a 25 HP chassis fitted with a sporting Saloon body, including springs and shock absorbers. | 30th Dec 1931 | Box 106 \ 1 scan0317 | |
| Chassis modifications, spring ratings, and steering columns for specific customer orders. | 31th Dec 1931 | Box 106 \ 1 scan0318 | |
| Car springing suitability for maximum speeds and the nomenclature of a chassis type. | 31th Dec 1931 | Box 106 \ 1 scan0319 | |
| Policy on road springs and friction dampers for the 20/25 HP model. | 5th Jan 1932 | Box 106 \ 1 scan0320 | |
| Seeking advice on the bulk purchase of cheaper 'Rolled Eye' type axle springs for the 25 HP model following successful testing. | 7th Jan 1932 | Box 106 \ 1 scan0321 | |
| Changing the front and rear road springs on a car. | 9th Jan 1932 | Box 106 \ 1 scan0322 | |
| Modifications for a 20/25 HP chassis intended for maximum speed work, focusing on suspension and steering. | 15th Jan 1932 | Box 106 \ 1 scan0323 | |
| Spring ratings and the use of shock absorbers for the 24/25 HP car. | 16th Jan 1932 | Box 106 \ 1 scan0324 | |
| Standardisation of chassis parts for rolled eye front and rear road springs fitted with plain grooved washers. | 9th Jan 1932 | Box 106 \ 1 scan0325 | |
| Fitting of a new part to a 'U' series chassis for testing. | 12th Apr 1932 | Box 106 \ 1 scan0326 | |
| Discussion of alternative schemes for a spring-controlled rear shackle for front springs. | 5th Apr 1932 | Box 106 \ 1 scan0327 | |
| Two schemes for a spring-controlled rear shackle for front springs, stating a preference and raising an objection. | 20th Apr 1932 | Box 106 \ 1 scan0328 | |
| Customer driving habits, car characteristics, and the need for more powerful and adjustable dampers. | 14th Jul 1932 | Box 106 \ 1 scan0329 | |
| Adjustment of hydraulic dampers to improve the ride quality on a 25 HP chassis with low rating springs. | 4th Oct 1932 | Box 106 \ 1 scan0330 | |
| Setup of 20/25 HP hydraulic dampers and low rating springs. | 5th Oct 1932 | Box 106 \ 1 scan0331 | |
| Guide on adjusting shock absorber loads for low rating springs by modifying the H.F. valve. | 12th Nov 1931 | Box 106 \ 1 scan0332 | |
| Optimal shock damper loads and settings for 20/25 HP and 40/50 HP models. | 16th Dec 1931 | Box 106 \ 1 scan0333 | |
| Guide on suspension settings for various car models (20/25 HP, Phantom) and driving conditions. | 16th Dec 1931 | Box 106 \ 1 scan0334 | |
| Recommendations for shock damper settings and modifications for road holding at speed. | 16th Dec 1931 | Box 106 \ 1 scan0335 | |
| Table detailing specifications and remarks for various front and rear suspension components. | 30th Nov 1932 | Box 106 \ 1 scan0336 | |
| Merits of articulating front wheels and critiquing the Dubonnet suspension scheme. | 30th Nov 1932 | Box 106 \ 1 scan0337 | |
| Extract detailing progress on an independent wheel suspension scheme, including plans for patent pictures and experimental drawings. | 6th Dec 1932 | Box 106 \ 1 scan0338 | |
| Test data table for Woodhead's 18.G.IV. Front off-side road springs for the 20/25 model. | 10th May 1933 | Box 106 \ 1 scan0339 | |
| Data table of measurements for near-side front leaf springs. | 10th May 1933 | Box 106 \ 1 scan0340 | |
| Data table detailing the stamped information and test results for offside and nearside plates. | 10th May 1933 | Box 106 \ 1 scan0341 | |
| Graph plotting load versus deflection for 20/25 HP front road springs. | 10th May 1933 | Box 106 \ 1 scan0342 | |
| Test report and data for 20/25 HP road springs. | 25th Apr 1933 | Box 106 \ 1 scan0343 | |
| Test results and data from separate leaf spring tests, including camber and load measurements. | 25th Apr 1933 | Box 106 \ 1 scan0344 | |
| Graph plotting deflection against load for 20/25 HP front road springs. | 25th Apr 1933 | Box 106 \ 1 scan0345 | |
| Development of an anti-roll rod for Phantom and 25 HP cars to improve ride stability. | 11th May 1934 | Box 106 \ 1 scan0346 | |
| Request to manufacture parts for a Dubonnet Independent Suspension system for model 17-G-IV. | 14th Jun 1934 | Box 106 \ 1 scan0347 | |
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