| Description | Date | Identifier | |
| Letter from Dunlop Rubber Co. Ltd. regarding the power consumption of 'Fort' Silent tyres. | 13th Feb 1930 | Box 45 \ 2 Scan222 | |
| Power consumption curves for a 'Fort' Dunlop Silent Cover tyre at various speeds and pressures. | 24th Jan 1930 | Box 45 \ 2 Scan223 | |
| Letter from Dunlop Rubber Co. Ltd. concerning the out of balance of 6 inch tyres for 19 inch rims. | 13th Feb 1930 | Box 45 \ 2 Scan224 | |
| Letter from Dunlop Rubber Co. regarding the production of rubber engine mounting blocks. | 13th Feb 1930 | Box 45 \ 2 Scan225 | |
| Letter to The Dunlop Rubber Co. Ltd. seeking clarification on tyre specifications for power consumption tests. | 14th Feb 1930 | Box 45 \ 2 Scan226 | |
| Out of balance specification for 6' tyres on 19' rims for the 20 HP chassis. | 14th Feb 1930 | Box 45 \ 2 Scan227 | |
| Letter to Dunlop Rubber Co. Ltd. authorising the supply of tyres with a specific out-of-balance measurement. | 14th Feb 1930 | Box 45 \ 2 Scan228 | |
| The discontinuation of 6¾' section tyres and their replacement with 7' section tyres for 20' rims. | 14th Feb 1930 | Box 45 \ 2 Scan229 | |
| Letter from Dunlop Rubber Co. Ltd. discussing changes to the specifications and manufacture of rubber blocks. | 14th Feb 1930 | Box 45 \ 2 Scan230 | |
| Letter from Dunlop Rubber Co. Ltd. discussing the dispatch and examination of sample blocks. | 15th Feb 1930 | Box 45 \ 2 Scan231 | |
| Letter to The Dunlop Rubber Co. Ltd. with instructions on modifying rubber engine mounting blocks for experimental testing. | 15th Feb 1930 | Box 45 \ 2 Scan232 | |
| Letter from Dunlop Rubber Co. regarding the requirements and delivery of 20 HP rubber engine mounting blocks. | 18th Feb 1930 | Box 45 \ 2 Scan233 | |
| Letter from Dunlop Rubber Co., Ltd. concerning tyre balance specifications for different sizes. | 19th Feb 1930 | Box 45 \ 2 Scan234 | |
| Letter to The Dunlop Rubber Co. Ltd. requesting an improved Silent Tread tyre pattern for experimental use. | 22th Feb 1930 | Box 45 \ 2 Scan235 | |
| Letter to The Dunlop Rubber Co. Ltd. concerning the inability to fit balance weights to 21' wheels. | 24th Feb 1930 | Box 45 \ 2 Scan236 | |
| Letter to The Dunlop Rubber Co. Ltd. requesting samples of a rubber block with specific deflection properties. | 24th Feb 1930 | Box 45 \ 2 Scan237 | |
| Letter from Dunlop Rubber Co. regarding Fort Dunlop and Standard Dunlop Silent covers. | 24th Feb 1930 | Box 45 \ 2 Scan238 | |
| Letter from Dunlop Rubber Co. regarding the production of sample mounting blocks with specific deflection and load characteristics. | 25th Feb 1930 | Box 45 \ 2 Scan239 | |
| Letter from Dunlop Rubber regarding the supply of engine mounting blocks, detailing specifications and a production delay. | 5th Mar 1930 | Box 45 \ 2 Scan240 | |
| Letter from Dunlop Rubber Co., Ltd. regarding the dispatch of two dozen harder and softer rubber blocks for testing. | 7th Mar 1930 | Box 45 \ 2 Scan241 | |
| Letter to Dunlop Rubber Co. Ltd. concerning the testing of rubber blocks for an engine foot. | 8th Mar 1930 | Box 45 \ 2 Scan242 | |
| Letter from Dunlop Rubber Co. Ltd. concerning the development and delivery of experimental tyres. | 8th Mar 1930 | Box 45 \ 2 Scan243 | |
| The urgent approval of rubber samples from Dunlop for semi-isolation between the dash and scuttle. | 10th Feb 1930 | Box 45 \ 2 Scan244 | |
| Comparing drawing dimensions to actual dimensions for rubber bushes used in semi-isolation between the dash and scuttle. | 11th Mar 1930 | Box 45 \ 2 Scan245 | |
| Letter from Dunlop Rubber Co. Ltd. regarding tyre power consumption test results. | 11th Mar 1930 | Box 45 \ 2 Scan246 | |
| Series of four graphs showing the power consumption of a 7.00-21 Dunlop Standard 'Silent' Tyre under varying loads, pressures, and speeds. | 4th Mar 1930 | Box 45 \ 2 Scan247 | |
| Four graphs showing the power consumption of a 'Fort' Dunlop Silent Tyre (6.00-19) under various loads, speeds and pressures. | 1st Feb 1930 | Box 45 \ 2 Scan248 | |
| Letter from Dunlop Rubber Co. Ltd. regarding advice on 21' wheels to allow more latitude for out-of-balance tyres. | 24th Mar 1930 | Box 45 \ 2 Scan249 | |
| The non-skidding properties and performance of silent tread tyres compared to other types on English roads. | 26th Mar 1930 | Box 45 \ 2 Scan250 | |
| Evolving an intermediate tyre to balance silence and safety. | 8th Apr 1930 | Box 45 \ 2 Scan251 | |
| Follow-up letter to Dunlop Rubber Co. Ltd. regarding the delivery of improved Silent Tread tyres. | 8th Apr 1930 | Box 45 \ 2 Scan252 | |
| Letter from Dunlop Rubber Co. Ltd. regarding Silent Tread Tyres and delaying a visit. | 10th Apr 1930 | Box 45 \ 2 Scan253 | |
| Letter from Dunlop Rubber Co. Ltd. regarding a delay in sending altered Silent tyres. | 16th May 1930 | Box 45 \ 2 Scan254 | |
| Letter to Dunlop Rubber Co. Ltd. regarding a discrepancy in a submitted tyre modification. | 24th May 1930 | Box 45 \ 2 Scan255 | |
| Letter from Dunlop regarding a misunderstanding and feedback request on a modified silent tread tyre. | 28th May 1930 | Box 45 \ 2 Scan256 | |
| Skidding experiments and performance tests of modified silent tread tyres. | 3rd Aug 1930 | Box 45 \ 2 Scan257 | |
| Modifications to silent tread tyres by cutting grooves, and considering standardising this new tread. | 1st Jun 1938 | Box 45 \ 2 Scan258 | |
| Letter to Dunlop Rubber Co. about the performance and balance of modified Silent Tread Tyres. | 4th Jun 1930 | Box 45 \ 2 Scan259 | |
| Letter to Dunlop Rubber Co. Ltd. requesting the return of a sample American wheel in Staybrite. | 5th Jun 1930 | Box 45 \ 2 Scan260 | |
| Balance weights and procedures for 7' tyres on 20' rims for the 40/50 model. | 5th Jun 1930 | Box 45 \ 2 Scan261 | |
| Requesting four silent tread tyres for testing, as two are insufficient to form an adequate opinion. | 6th Jun 1930 | Box 45 \ 2 Scan262 | |
| Letter from Dunlop Rubber Co., Ltd. acknowledging receipt of a previous communication. | 6th Jun 1930 | Box 45 \ 2 Scan263 | |
| Letter from Dunlop Rubber Co. regarding modified 'Silent' tyres and out-of-balance specifications. | 6th Jun 1930 | Box 45 \ 2 Scan264 | |
| Temperature and fuel system tests conducted at the Brooklands track. | 11th Jun 1930 | Box 45 \ 2 Scan265 | |
| Acceleration test results comparing a standard carburetter with an air silencer carburetter. | 11th Jun 1930 | Box 45 \ 2 Scan266 | |
| Steering tests conducted at Brooklands with different tyre types and pressures. | 4th Jun 1930 | Box 45 \ 2 Scan267 | |
| Test report on the performance of 7 x 20 Dunlop Silent Tyres at various pressures and wheel configurations. | 17th Jun 1930 | Box 45 \ 2 Scan268 | |
| The dispatch of new 'Silent Tread Tyres' with improved non-skidding properties for testing. | 17th Jun 1930 | Box 45 \ 2 Scan269 | |
| Letter to the Dunlop Rubber Co. Ltd. regarding tyre failures on 40/50 cars at Brooklands and requesting suitable racing tyres. | 23th Jun 1930 | Box 45 \ 2 Scan270 | |
| The performance of a new experimental 'Silent Tread' tyre. | 23th Jun 1930 | Box 45 \ 2 Scan271 | |
| Order for two sets of six special tyres from the Dunlop Rubber Co. for use on Brooklands Track. | 26th Jun 1930 | Box 45 \ 2 Scan272 | |
| Requesting an opinion on a second set of modified Silent Tread tyres and an enquiry about suitable treads from Dunlop. | 26th Jun 1930 | Box 45 \ 2 Scan273 | |
| Letter from Dunlop Rubber Co. Ltd. discussing their findings on tyre noise, concluding that most noise comes from the rear tyres contrary to a previous opinion. | 2nd Jul 1930 | Box 45 \ 2 Scan274 | |
| Letter from Dunlop Rubber Co. Ltd. regarding the incorrect delivery of Fort Silent tyre covers. | 2nd Jul 1930 | Box 45 \ 2 Scan275 | |
| Letter from Dunlop Rubber Co. Ltd. regarding a partial despatch of an order for special racing tyres. | 3rd Jul 1930 | Box 45 \ 2 Scan276 | |
| Return of two incorrectly sized tyres to the Dunlop Rubber Co. | 10th Jul 1930 | Box 45 \ 2 Scan277 | |
| Letter to Dunlop discussing wheel rim and tire compatibility for cars exported to the U.S. | 15th Jul 1930 | Box 45 \ 2 Scan278 | |
| Letter discussing further testing on American tires and rims, and requesting information for standardization. | 22th Jul 1930 | Box 45 \ 2 Scan279 | |
| Querying the dispatch of six special racing tyres from the Dunlop Company to Mr. Rowbotham at Brooklands. | 22th Jul 1930 | Box 45 \ 2 Scan280 | |
| Short memo confirming the delivery of six special racing tyres. | 22th Jul 1930 | Box 45 \ 2 Scan281 | |
| Letter from Dunlop Rubber Co. Ltd. regarding the return of two tyre covers and requesting their usage mileage. | 25th Jul 1930 | Box 45 \ 2 Scan282 | |
| Encouraging results of experimental silent tread Dunlop tyres. | 8th Aug 1930 | Box 45 \ 2 Scan283 | |
| Covering memo forwarding a letter and blueprint from Dunlop Co. regarding a 7' tyre for a 19' rim. | 9th Aug 1930 | Box 45 \ 2 Scan284 | |
| Letter from Dunlop regarding Drop Centre Rim modifications and international standards. | 9th Aug 1930 | Box 45 \ 2 Scan285 | |
| Letter from the Dunlop Rubber Co. Ltd. regarding the production of a 27.00 tyre and the 'Silent Pattern' mould. | 17th Jul 1936 | Box 45 \ 2 Scan286 | |
| Proposal drawing for 4.00' and 4.37' well base rims. | 17th Jul 1936 | Box 45 \ 2 Scan287 | |
| Letter to Dunlop Rubber Co. Ltd. concerning the estimated mileage of tyres. | 11th Aug 1930 | Box 45 \ 2 Scan288 | |
| Enquiry from Dunlop Rubber Co. regarding the tread design of silent type tyres. | 11th Aug 1930 | Box 45 \ 2 Scan289 | |
| Letter to The Dunlop Rubber Co. concerning tests on a modified silent tread tyre. | 13th Aug 1930 | Box 45 \ 2 Scan290 | |
| Letter from Dunlop Rubber Co. Ltd. discussing the trend in American rim diameters. | 15th Aug 1930 | Box 45 \ 2 Scan291 | |
| Order request for a set of six 20-inch wheels from The Dunlop Rubber Co. | 25th Aug 1930 | Box 45 \ 2 Scan292 | |
| Letter to the Dunlop Rubber Co. Ltd. requesting tyre radius data for speedometer calibration. | 25th Aug 1930 | Box 45 \ 2 Scan293 | |
| Letter from Dunlop Rubber Co. Ltd. responding to an inquiry about 20 HP and 40/50 tyres. | 26th Aug 1930 | Box 45 \ 2 Scan294 | |
| Internal order request for two sets of Dunlop tyres with a new improved silent tread for the 20 HP and 40/50 HP models. | 5th Sep 1930 | Box 45 \ 2 Scan295 | |
| Order to The Dunlop Rubber Co. for two sets of tyres with an improved silent tread pattern for the 20 HP and 40/50 models. | 6th Sep 1930 | Box 45 \ 2 Scan296 | |
| Inquiry about standardising a new type of Dunlop tyre with silent running and improved road adhesion qualities. | 17th Sep 1930 | Box 45 \ 2 Scan297 | |
| Letter from Dunlop Rubber Co. Ltd. regarding test results for 20 HP & 40/50 tyres. | 19th Sep 1930 | Box 45 \ 2 Scan298 | |
| Graph showing the effect of speed on the effective radius of two different sizes of Dunlop Fort Silent tyres. | 12th Sep 1930 | Box 45 \ 2 Scan299 | |
| Gaining more experience with a set of tyres, focusing on wear, before standardisation. | 22th Sep 1930 | Box 45 \ 2 Scan300 | |
| Letter to The Dunlop Rubber Co. Ltd. requesting information on the difference between a tyre running under load versus running light. | 22th Sep 1930 | Box 45 \ 2 Scan301 | |
| Letter from Dunlop Rubber Co. Ltd. clarifying that the measurable difference between a tyre under load and one running light is negligible. | 23th Sep 1930 | Box 45 \ 2 Scan302 | |
| Urgently testing new tyres due to complaints about the adhesive properties of 'Silent tyres' with winter approaching. | 26th Sep 1930 | Box 45 \ 2 Scan303 | |
| Letter from Dunlop Rubber Co. Ltd. regarding the incorrect dispatch of tyres and arranging a replacement. | 27th Sep 1930 | Box 45 \ 2 Scan304 | |
| Letter to Dunlop Rubber Co. Ltd. regarding the fitting of tyres. | 29th Sep 1930 | Box 45 \ 2 Scan305 | |
| The wear and tear of experimental silent type tyres after 4,700 miles of testing. | 4th Oct 1930 | Box 45 \ 2 Scan306 | |
| Inquiry from Dunlop Rubber Co. about the adoption of a modified 'Silent tyre' tread following a 10,000 miles test. | 6th Oct 1930 | Box 45 \ 2 Scan307 | |
| Letter to the Dunlop Rubber Co. Ltd. regarding the decision to adopt the Silent Tread Tyre as standard equipment. | 7th Oct 1930 | Box 45 \ 2 Scan308 | |
| Test report on modified Dunlop Silent Tread Tyres, focusing on road adhesion and noise characteristics. | 7th Oct 1930 | Box 45 \ 2 Scan309 | |
| Tyre modification testing, noting improved wear and proposing standardisation. | 7th Oct 1930 | Box 45 \ 2 Scan310 | |
| Letter returning a signed standardisation sheet for a modification to tyre tread patterns and inquiring about availability. | 9th Oct 1930 | Box 45 \ 2 Scan311 | |
| Letter to The Dunlop Rubber Co. Ltd concerning the return of 20 inch tyres. | 10th Oct 1930 | Box 45 \ 2 Scan312 | |
| Letter to the Dunlop Rubber Co. Ltd. regarding wellingtons and the search for improved 'Silent Tread' tyres. | 11th Oct 1930 | Box 45 \ 2 Scan313 | |
| Letter from Dunlop Rubber Co. Ltd. discussing an invoice for Wellingtons and new tyre production. | 13th Oct 1930 | Box 45 \ 2 Scan314 | |
| Letter from Dunlop Rubber Co. Ltd. confirming the traced receipt of 5 Fort Silent covers with a modified tread. | 14th Oct 1930 | Box 45 \ 2 Scan315 | |
| Letter to The Dunlop Rubber Co. Ltd. enclosing a cheque for payment of an account. | 20th Oct 1930 | Box 45 \ 2 Scan316 | |
| Letter to Dunlop Rubber Co. Ltd. specifying that tyres for the 20 HP and 40/50 HP models are required in 'Fort' type. | 21th Oct 1930 | Box 45 \ 2 Scan317 | |
| Chasing an overdue requisition for tyres and tubes received from the Dunlop Rubber Co. | 29th Oct 1930 | Box 45 \ 2 Scan318 | |
| Modified tread for Dunlop Silent Tyres. | 6th Nov 1930 | Box 45 \ 2 Scan319 | |
| Standardisation document for a modification to the tyre tread pattern. | 7th Oct 1930 | Box 45 \ 2 Scan320 | |
| Letter regarding the supply of modified Silent Tread Tyres from Dunlop for 20/25 and 40/50 HP chassis. | 19th Nov 1930 | Box 45 \ 2 Scan321 | |
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