| Description | Date | Identifier | |
| Analysis of vehicle suspension experiments concerning ride quality, shock dampers, and cornering roll. | 14th Jan 1935 | Box 154 \ 1 scan0243 | |
| Technical assessment of car 19-G-IV, focusing on front suspension, brakes, and ground clearance. | 14th Jan 1935 | Box 154 \ 1 scan0244 | |
| Photograph showing a close-up of the front left wheel, suspension, and radiator of a car. | 14th Jan 1935 | Box 154 \ 1 scan0245 | |
| Photograph showing the front left wheel hub, brake drum, and suspension assembly with the wheel removed. | 14th Jan 1935 | Box 154 \ 1 scan0246 | |
| Graph plotting wheel deflection in inches against load on the wheel in pounds for a Dubonnet Suspension system. | 16th Jan 1935 | Box 154 \ 1 scan0247 | |
| Requesting an increase in rebound wheel movement on the front suspension for a Buick and a 19-G-IV car. | 16th Jan 1935 | Box 154 \ 1 scan0248 | |
| Requesting a covering order for a pair of Phantom front road springs with modified specifications. | 18th Jan 1935 | Box 154 \ 1 scan0249 | |
| Requesting payment approval for a £200 final account from Mons. Dubonnet regarding a suspension system. | 27th Jan 1935 | Box 154 \ 1 scan0250 | |
| Requesting payment for an attached account concerning the Dubonnet Suspension. | 28th Jan 1935 | Box 154 \ 1 scan0251 | |
| Questioning the continuation of experiments on a 20/25 HP car fitted with Dubonnet Suspension. | 31th Jan 1935 | Box 154 \ 1 scan0252 | |
| Decision to cease work on the Dubonnet suspension and the ongoing challenges with independent front suspension. | 1st Feb 1935 | Box 154 \ 1 scan0253 | |
| Decision to stop work on a 20/25 HP car fitted with Dubonnet Suspension. | 1st Feb 1935 | Box 154 \ 1 scan0254 | |
| Letter from a supplier regarding the specifications and delivery of special front springs. | 6th Feb 1935 | Box 154 \ 1 scan0255 | |
| Letter to T. Firth & John Brown Ltd confirming an order for 25 HP road springs and Bentley springs. | 16th Feb 1935 | Box 154 \ 1 scan0256 | |
| Development of independent springing and referencing competitors like Cadillac and Packard. | 25th Feb 1935 | Box 154 \ 1 scan0257 | |
| Superior road springs of American cars and suggesting an examination of a Cadillac spring. | 4th Feb 1935 | Box 154 \ 1 scan0258 | |
| Letter from Zeiss Ikon detailing the features of their new Movikon 16mm camera. | 18th May 1935 | Box 154 \ 1 scan0259 | |
| Page two of a letter from Zeiss Ikon Ltd. regarding the unavailability of a Movikon camera. | 22th May 1935 | Box 154 \ 1 scan0260 | |
| Letter to Zeiss Ikon Ltd. discussing 16mm film quality, enlargements, and arranging a camera demonstration. | 22th May 1935 | Box 154 \ 1 scan0261 | |
| Letter from Zeiss Ikon acknowledging a request and providing a price for processing 16mm film. | 23th May 1935 | Box 154 \ 1 scan0262 | |
| From Sg. to Hs. recommending the scrapping of the Dubonnet suspension project based on information received from America. | 2nd Dec 1935 | Box 154 \ 1 scan0263 | |
| Technical document detailing formulas for leaf springs and the relationship between weight, stress, and rating. | 26th Feb 1936 | Box 154 \ 1 scan0264 | |
| Letter to Messrs. Samuel Fox & Co. Ltd. requesting a booklet on the manufacture and design of car road springs. | 27th Feb 1936 | Box 154 \ 1 scan0265 | |
| Alternative independent suspension programmes for Bentley. | 29th May 1936 | Box 154 \ 1 scan0266 | |
| The development and implementation of a torsion bar suspension system, referencing Citroen, Packard, and Bentley models. | 7th Apr 1936 | Box 154 \ 1 scan0267 | |
| Specifications for ordering and stress calculations for compression springs. | 7th Apr 1936 | Box 154 \ 1 scan0268 | |
| Page of calculations for determining stress and wire size in steel springs. | 7th Apr 1936 | Box 154 \ 1 scan0269 | |
| The formula and calculations for spring deflection. | 7th Apr 1936 | Box 154 \ 1 scan0270 | |
| Formulas and material considerations for calculating helical and square wire spring deflection. | 7th Apr 1936 | Box 154 \ 1 scan0271 | |
| Page from a spring design guide discussing a formula by Stewart from the S.A.E. Journal. | 7th Apr 1936 | Box 154 \ 1 scan0272 | |
| Formulas for round and square wire springs, including tolerance considerations and the Wahl Formula for stress. | 7th Apr 1936 | Box 154 \ 1 scan0273 | |
| Graph showing the actual stress curve of helical compression springs. | 7th Apr 1936 | Box 154 \ 1 scan0274 | |
| Table of suggested total stress for helical compression springs made from various materials. | 7th Apr 1936 | Box 154 \ 1 scan0275 | |
| Page detailing vibration frequency formulas, specifically the B-G-R formula for quick computation. | 7th Apr 1936 | Box 154 \ 1 scan0276 | |
| Specification sheet for extension springs, including ordering details and calculation formulas. | 7th Apr 1936 | Box 154 \ 1 scan0277 | |
| Page of calculations for the modulus of resilience and energy content of springs, including a worked example. | 7th Apr 1936 | Box 154 \ 1 scan0278 | |
| Page of calculations for spring resilience, energy, and material weight. | 7th Apr 1936 | Box 154 \ 1 scan0279 | |
| Specification sheet for ordering torsion springs, including formulas for load calculation and diagrams of various end types. | 7th Apr 1936 | Box 154 \ 1 scan0280 | |
| Data table listing the third and fourth powers of wire diameters. | 7th Aug 1936 | Box 154 \ 1 scan0281 | |
| Letter to The Gordon Armstrong Patent Suspension Co. Ltd. regarding a demonstration of their independent front wheel suspension. | 7th Aug 1936 | Box 154 \ 1 scan0282 | |
| Despatch of Gordon Armstrong suspension parts and accompanying drawings. | 14th Aug 1936 | Box 154 \ 1 scan0283 | |
| Receipt of drawings and parts for a Gordon Armstrong Suspension system for examination. | 17th Aug 1936 | Box 154 \ 1 scan0284 | |
| Report on Mr. Gordon Armstrong's Bentley Car. | 17th Aug 1936 | Box 154 \ 1 scan0285 | |
| Test report on Mr Gordon Armstrong's modified Bentley car, focusing on its suspension and handling. | 18th Aug 1936 | Box 154 \ 1 scan0286 | |
| Comparing independent front suspension systems, detailing issues with oscillations, steering reactions, and cornering performance. | 18th Aug 1936 | Box 154 \ 1 scan0287 | |
| Suspension systems, comparing an internal torsion bar design against one from Mr. Gordon Armstrong. | 26th Sep 1936 | Box 154 \ 1 scan0288 | |
| Letter to Gordon Armstrong Patent Suspension Co. Ltd. confirming the dispatch of wheels. | 26th Sep 1936 | Box 154 \ 1 scan0289 | |
| Letter chasing the dispatch address for a delayed delivery of off-set wheels. | 2nd Oct 1936 | Box 154 \ 1 scan0290 | |
| Letter from the Experimental Department regarding the dispatch of special Bentley road wheels. | 5th Oct 1936 | Box 154 \ 1 scan0291 | |
| Despatch of two special Bentley road wheels with tyres to Gordon Armstrong for testing. | 5th Oct 1936 | Box 154 \ 1 scan0292 | |
| Letter from Gordon Armstrong Patent Suspension Company detailing test results on offset wheels and steering. | 7th Oct 1936 | Box 154 \ 1 scan0293 | |
| Letter from Gordon Armstrong Patent Suspension concerning steering dimensions and wheel offset. | 7th Oct 1936 | Box 154 \ 1 scan0294 | |
| Letter to Gordon Armstrong regarding improved steering and a suggested visit to the Works to try the car. | 8th Oct 1936 | Box 154 \ 1 scan0295 | |
| Letter from Gordon Armstrong Patent Suspension confirming a meeting appointment with Mr. Robotham. | 9th Oct 1936 | Box 154 \ 1 scan0296 | |
| Telegram received by telephone. | 13th Oct 1936 | Box 154 \ 1 scan0297 | |
| Telegram message regarding the collection of a car for work on its Gordon Armstrong patent suspension. | 27th Oct 1936 | Box 154 \ 1 scan0298 | |
| Letter from the Experimental Department discussing car steering, understeering, and damper performance. | 3rd Nov 1936 | Box 154 \ 1 scan0299 | |
| Page 2 of a letter discussing the results of an endurance test on dampers and proposing further modifications for testing on a car. | 3rd Nov 1936 | Box 154 \ 1 scan0300 | |
| Graph plotting understeer and oversteer against sideway acceleration for a Gordon Armstrong Suspension Bentley. | 11th Nov 1936 | Box 154 \ 1 scan0301 | |
| Letter from George Angus & Co Ltd about supplying special gasket and diaphragm material samples. | 11th Nov 1936 | Box 154 \ 1 scan0302 | |
| Changes to the poundage and plate thickness of rear road springs for the Phantom III. | 18th Nov 1936 | Box 154 \ 1 scan0303 | |
| Letter from Marconi-Ekco Instruments Ltd. proposing equipment for satisfactory stress measurement using a Cathode Ray Oscillograph. | 12th Dec 1936 | Box 154 \ 1 scan0304 | |
| Letter from Marconi-Ekco Instruments Ltd. regarding the supply of items and arranging a visit. | 12th Dec 1936 | Box 154 \ 1 scan0305 | |
| Letter from Jonas Woodhead & Sons Ltd. regarding a quotation for experimental springs. | 5th Feb 1937 | Box 154 \ 1 scan0306 | |
| Letter to Richard Berry & Sons arranging a visit to discuss testing their road springs. | 9th Feb 1937 | Box 154 \ 1 scan0307 | |
| Despatch of 8 lubricator adaptors to Messrs Jonas Woodhead & Sons, which are to be returned. | 10th Feb 1937 | Box 154 \ 1 scan0308 | |
| Letter from Richard Berry & Son regarding a visit for Mr. Leslie to test a pair of road springs. | 10th Feb 1937 | Box 154 \ 1 scan0309 | |
| Letter from the Experimental Department confirming an appointment with Richard Berry & Son. | 11th Feb 1937 | Box 154 \ 1 scan0310 | |
| Request to manufacture parts to test a stabilus device on project 1B.IV. | 11th Feb 1937 | Box 154 \ 1 scan0311 | |
| Cover sheet with stamped details for an individual at a London hotel, related to parts made. | 15th Feb 1937 | Box 154 \ 1 scan0312 | |
| Telegram received by telephone confirming experimental stabilisator parts are ready. | 13th Feb 1934 | Box 154 \ 1 scan0313 | |
| Telegram received by telephone regarding experimental stabilisator parts being ready. | 13th Feb 1937 | Box 154 \ 1 scan0314 | |
| Follow-up letter from Marconi-Ekco Instruments regarding apparatus for Stress Measurements. | 11th Feb 1937 | Box 154 \ 1 scan0315 | |
| Letter from spring manufacturer Richard Berry & Son confirming a meeting with Mr. Leslie. | 12th Feb 1937 | Box 154 \ 1 scan0316 | |
| Telegram inquiring about the readiness of parts for the experimental department's stabilisator. | 13th Feb 1937 | Box 154 \ 1 scan0317 | |
| Letter to Marconi-Ekco Instruments Ltd. declining their proposed load measurement apparatus as too complicated. | 16th Feb 1937 | Box 154 \ 1 scan0318 | |
| Dispatch request for parts of a 'Stabilus' anti-roll system on loan. | 19th Feb 1937 | Box 154 \ 1 scan0319 | |
| Letter from Marconi-Ekco Instruments Ltd. responding to an enquiry about a load measuring instrument. | 23th Feb 1937 | Box 154 \ 1 scan0320 | |
| The despatch of three pairs of road springs to Firths for modification. | 3rd Nov 1936 | Box 154 \ 1 scan0321 | |
| Letter to supplier T. Firth & John Brown Ltd. regarding the resetting of road springs. | 3rd Nov 1936 | Box 154 \ 1 scan0322 | |
| Request to issue a covering order to the English Steel Corporation for one pair of Wraith rear springs. | 16th Nov 1936 | Box 154 \ 1 scan0323 | |
| Letter to the English Steel Corporation Ltd. requesting the production of a test pair of road springs with specified alterations. | 16th Nov 1936 | Box 154 \ 1 scan0324 | |
| Page two of a letter to The English Steel Corporation Ltd. regarding a highly stressed spring. | 16th Nov 1936 | Box 154 \ 1 scan0325 | |
| Letter from English Steel Corporation regarding the production of experimental springs. | 25th Nov 1936 | Box 154 \ 1 scan0326 | |
| Letter to The English Steel Corporation requesting pricing for special road springs for experimental and production purposes. | 13th Jan 1937 | Box 154 \ 1 scan0327 | |
| Request to send a covering order to James Woodhead & Co. Ltd. for two experimental pairs of springs. | 4th Feb 1937 | Box 154 \ 1 scan0328 | |
| Letter to James Woodhead & Sons Ltd. detailing the specifications for two pairs of road springs. | 4th Feb 1937 | Box 154 \ 1 scan0329 | |
| Letter requesting a quote for 400 springs and arranging a covering order. | 4th Feb 1937 | Box 154 \ 1 scan0330 | |
| Letter to English Steel Corporation confirming an urgent order for two coil springs with specific dimensions. | 17th Mar 1937 | Box 154 \ 1 scan0331 | |
| Letter to a supplier regarding specifications and pricing for Bentley rear springs. | 19th Mar 1937 | Box 154 \ 1 scan0332 | |
| Covering order for six coil springs from the English Steel Corp. | 25th Mar 1937 | Box 154 \ 1 scan0333 | |
| Order for Phantom III rear springs from Firth's and an inquiry for production pricing. | 5th Apr 1937 | Box 154 \ 1 scan0334 | |
| Two rear spring top plates being returned for inspection to Jonas Woodhead & Sons Ltd. | 5th Apr 1937 | Box 154 \ 1 scan0335 | |
| Letter to supplier Jonas Woodhead & Sons Ltd. regarding an order and quality issues with Bentley springs. | 5th Apr 1937 | Box 154 \ 1 scan0336 | |
| Letter discussing a reduction in thickness on a spring top plate, proposing a solution. | 5th Apr 1937 | Box 154 \ 1 scan0337 | |
| Letter to the English Steel Corporation regarding a failed road spring and an overdue order for Bentley springs. | 21th Apr 1937 | Box 154 \ 1 scan0338 | |
| Broken rear road spring being returned for examination. | 21th Apr 1937 | Box 154 \ 1 scan0339 | |
| Request to arrange a covering order for a pair of springs from Woodheads. | 21th Apr 1937 | Box 154 \ 1 scan0340 | |
| Table of weights in pounds for various components of 1937 Buick Series '40', '60', '80', and '90' models. | 24th Mar 1937 | Box 154 \ 1 scan0341 | |
| Dispatch of 4 lubricators to Jonas Woodhead & Sons Ltd for fitment to springs. | 5th May 1937 | Box 154 \ 1 scan0342 | |
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