| Description | Date | Identifier | |
| Tyre pressures, wear, and ride comfort, comparing a Rolls Royce chassis with a Marmon car. | 13th Oct 1921 | Box 39 \ 2 Scan097 | |
| Letter to Goodyear Tyre & Rubber Co. regarding the benefits of low-pressure cord tyres. | 30th Sep 1921 | Box 39 \ 2 Scan098 | |
| Advantages of low tyre pressures and a strategy to convince tyre manufacturers. | 13th Oct 1921 | Box 39 \ 2 Scan099 | |
| Tyre pressures, balancing comfort against wear and a suggestion for Michelin officials regarding recommended pressures. | 13th Oct 1921 | Box 39 \ 2 Scan100 | |
| Protest letter sent to Michelin regarding their wish for high tyre pressures. | 15th Oct 1921 | Box 39 \ 2 Scan101 | |
| Letter to Michelin Tyre Co Ltd. clarifying recommended tyre pressures for various car weights. | 15th Oct 1921 | Box 39 \ 2 Scan102 | |
| Letter from Michelin Tyre Co. Ltd. regarding a misunderstanding about the inflation pressure of their Cable Tyres. | 17th Oct 1921 | Box 39 \ 2 Scan103 | |
| Enquiring if Michelin has reduced the pressure on their cable tyres to align with Dunlop. | 18th Oct 1921 | Box 39 \ 2 Scan104 | |
| Inquiring if Michelin has reduced the pressure on their cable tyres in line with Dunlops. | 18th Oct 1921 | Box 39 \ 2 Scan105 | |
| Internal memorandum and handwritten reply regarding correspondence with the Michelin Company about their cable tyres. | 20th Oct 1921 | Box 39 \ 2 Scan106 | |
| Correct operating pressure for Michelin Cable Tyres. | 20th Oct 1921 | Box 39 \ 2 Scan107 | |
| Letter from Michelin providing a table of maximum axle loads for various cable tyre sections and corresponding inflation pressures. | 22th Oct 1921 | Box 39 \ 2 Scan108 | |
| Letter from Michelin Tyre Co. Ltd. providing a table of maximum axle loads and corresponding tyre pressures. | 22th Oct 1921 | Box 39 \ 2 Scan109 | |
| Price list for Michelin motor car tyres, detailing Beaded-edge and Straight-side types. | 1st Oct 1921 | Box 39 \ 2 Scan110 | |
| Price list and specification sheet for Michelin 'Cable' motor car tyres. | 1st Oct 1921 | Box 39 \ 2 Scan111 | |
| Tyre pressures and correspondence with the Michelin Company. | 22th Oct 1921 | Box 39 \ 2 Scan112 | |
| Internal memorandum regarding tyre pressures and correspondence with the Michelin Company. | 22th Oct 1921 | Box 39 \ 2 Scan113 | |
| Copy of a letter from Michelin Tyre Co. Ltd. regarding a misunderstanding over the inflation pressure for Cable Tyres. | 17th Oct 1921 | Box 39 \ 2 Scan114 | |
| Tyre pressures, enclosing a copy of a letter from the Michelin Tyre Company. | 25th Oct 1921 | Box 39 \ 2 Scan115 | |
| Tyre pressures, enclosing a letter received from the Michelin Tyre Company. | 25th Oct 1921 | Box 39 \ 2 Scan116 | |
| Letter from Michelin Tyre Co Ltd. detailing recommended inflating pressures for Cable Tyres based on axle load. | 22th Oct 1921 | Box 39 \ 2 Scan117 | |
| Discrepancy between company-recommended tyre pressures and those suggested by Dunlop. | 28th Oct 1921 | Box 39 \ 2 Scan118 | |
| Tyre pressures provided by Michelin and proposing new additions for specific axle weights. | 29th Oct 1921 | Box 39 \ 2 Scan119 | |
| Requesting instructions regarding recommended tyre pressures from the Michelin Company. | 5th Nov 1921 | Box 39 \ 2 Scan120 | |
| Letter from Goodyear Tyre & Rubber Company regarding tyre pressures. | 14th Nov 1921 | Box 39 \ 2 Scan121 | |
| Letter from a tyre manufacturer explaining the effects of tyre pressure on mileage and tread wear. | 14th Nov 1921 | Box 39 \ 2 Scan122 | |
| Tyre pressure maintenance, user behaviour, and the performance of cord versus fabric tyres. | 14th Nov 1921 | Box 39 \ 2 Scan123 | |
| Letter providing recommendations on tyre pressure for straight-side cord tyres. | 14th Nov 1921 | Box 39 \ 2 Scan124 | |
| Letter from Goodyear's Managing Director regarding a follow-up visit and an inquiry about tyre test mileage. | 22th Nov 1921 | Box 39 \ 2 Scan125 | |
| Follow-up memo requesting a definitive decision on tyre pressures for circulation to depots. | 22th Nov 1921 | Box 39 \ 2 Scan126 | |
| Request for definite tyre pressure recommendations for Dunlop and Michelin tyres. | 3rd Dec 1921 | Box 39 \ 2 Scan127 | |
| Standardization of tyre pressures with Michelin and other tyre makers. | 12th Dec 1921 | Box 39 \ 2 Scan128 | |
| Cover letter regarding an attached Michelin letter and a table of tyre pressures. | 23th Dec 1921 | Box 39 \ 2 Scan129 | |
| Letter from Michelin Tyre Co Ltd. regarding tyre pressures and an enclosed inflation table. | 22th Dec 1921 | Box 39 \ 2 Scan130 | |
| Inflation table for Michelin beaded edge tyres. | 3rd Nov 1921 | Box 39 \ 2 Scan131 | |
| Query regarding instructions to owners about the inflation of tyres and pressure. | 20th Nov 1921 | Box 39 \ 2 Scan132 | |
| Recommended tyre pressures from the Michelin Company. | 25th Nov 1921 | Box 39 \ 2 Scan133 | |
| Clarity of tyre inflation instructions for customers. | 27th Nov 1921 | Box 39 \ 2 Scan134 | |
| How correct tyre inflation could reduce complaints and expenses related to springs. | 29th Nov 1921 | Box 39 \ 2 Scan135 | |
| Request for a table of recommended tyre pressures following recent springing complaints. | 1st Jan 1923 | Box 39 \ 2 Scan136 | |
| Recommendation to fit Hartford pattern double-acting shock dampers to the 40/50 chassis to counteract issues caused by the increased resilience of cord tyres. | 10th Feb 1922 | Box 39 \ 2 Scan137 | |
| Setup of shock dampers and springs for a vehicle. | 19th Apr 1922 | Box 39 \ 2 Scan138 | |
| Vital importance of correct tyre pressures for Goshawk-11 cars. | 19th Apr 1922 | Box 39 \ 2 Scan139 | |
| Letter to the Dunlop Tyre Company disagreeing with the high pressure of 70 lbs moulded onto their supplied tyres. | 1st May 1922 | Box 39 \ 2 Scan140 | |
| Recommended tyre pressures from various manufacturers, namely Michelin, Dunlop and Palmer. | 1st May 1922 | Box 39 \ 2 Scan141 | |
| Table comparing tyre specifications for load and pressure for various makes. | 1st May 1922 | Box 39 \ 2 Scan142 | |
| Reduced tyre pressures following Goshawk tests and communication from the Dunlop Co. | 18th May 1922 | Box 39 \ 2 Scan143 | |
| Letter from Dunlop Rubber Co. Ltd. providing a revised table of pressures and loads for Cord Tyres. | 16th May 1922 | Box 39 \ 2 Scan144 | |
| Booklets from Dunlop and Michelin outlining new agreed reduced tyre pressures. | 20th Jun 1922 | Box 39 \ 2 Scan145 | |
| Discrepancies in recommended tyre pressures from Dunlop compared to the company's own and Michelin's standards. | 23th Jun 1922 | Box 39 \ 2 Scan146 | |
| Brief typed note responding to concerns about figures in a Dunlop 'Correct Tyre Inflation' booklet. | 28th Jun 1922 | Box 39 \ 2 Scan147 | |
| Letter to Dunlop Rubber Co. questioning the tyre pressures listed in their new booklet. | 28th Jun 1922 | Box 39 \ 2 Scan148 | |
| Table comparing Dunlop tyre pressures and maximum loads from various lists and a letter. | 28th Jun 1922 | Box 39 \ 2 Scan149 | |
| Covering note for an attached letter received from the Dunlop Co. regarding tyre pressures. | 30th Jun 1922 | Box 39 \ 2 Scan150 | |
| Letter from Dunlop Rubber Co. Ltd. regarding the dispatch of incorrect tyre inflation lists and providing revised information. | 29th Jun 1922 | Box 39 \ 2 Scan151 | |
| Dunlop Tyre Pressures, enclosing a 'Care of Tyres' booklet. | 17th Jul 1922 | Box 39 \ 2 Scan152 | |
| Discrepancies in recommended tyre pressures and axle loads from Dunlop. | 18th Jul 1922 | Box 39 \ 2 Scan153 | |
| Letter regarding the difficulty in persuading Dunlop Co. to lower their recommended tyre pressures. | 31th Jul 1922 | Box 39 \ 2 Scan154 | |
| Ongoing efforts to influence tyre manufacturers on tyre pressure standards. | 7th Nov 1922 | Box 39 \ 2 Scan155 | |
| Tyre pressures for the Goshawk model. | 27th Nov 1922 | Box 39 \ 2 Scan156 | |
| Tyre pressure recommendations from the Dunlop Company, referencing their booklet 'The care of Tyres'. | 27th Dec 1922 | Box 39 \ 2 Scan157 | |
| Letter from Dunlop Rubber Co. Ltd. regarding tyre pressures, load schedules, and tyre life. | 22th Dec 1922 | Box 39 \ 2 Scan158 | |
| Letter explaining the detrimental effects of tyre pressure reduction on performance and life, with reference to two graphs. | 22th Dec 1922 | Box 39 \ 2 Scan159 | |
| Letter from Dunlop Rubber Co. Ltd. concerning the adoption of lower pressures for Cord Tyres. | 2nd May 1923 | Box 39 \ 2 Scan160 | |
| Comparison of speeds with different tyre pressures on a 6-EX car. | 2nd May 1923 | Box 39 \ 2 Scan161 | |
| Demonstration of new low-pressure tyres from the Dunlop Rubber Co. | 16th May 1923 | Box 39 \ 2 Scan162 | |
| The characteristics, testing, and fitting of new Dunlop tyres on 20 HP and 40/50 HP car models. | 2nd Jun 1923 | Box 39 \ 2 Scan163 | |
| Tests carried out to prove the effect of tyre pressures on maximum speed. | 2nd Jun 1923 | Box 39 \ 2 Scan164 | |
| Tests conducted to determine the effect of tyre pressures on the performance of a 40/50 model. | 1st Jun 1923 | Box 39 \ 2 Scan165 | |
| Tyre tests, analysing the effects on speedometer readings, maximum speed, tractive resistance, and fuel consumption. | 1st Jun 1923 | Box 39 \ 2 Scan166 | |
| The difference in petrol consumption based on tyre pressure. | 18th Jun 1923 | Box 39 \ 2 Scan167 | |
| Graph showing the effect of tyre deflation on tractive resistance for well-worn Canadian Dunlop Cord tyres. | 18th Jun 1923 | Box 39 \ 2 Scan168 | |
| Letter to Dunlop Rubber Co. detailing the disadvantages experienced with balloon tyres, focusing on tread noise and vibration. | 1st Oct 1923 | Box 39 \ 2 Scan169 | |
| Faults, specifically vibration and noise, observed during the testing of Balloon tyres on different car models. | 28th May 1924 | Box 39 \ 2 Scan170 | |
| On tyre pressures for the 20 HP chassis, comparing experiences with Dunlop and Rapson tyres. | 28th May 1924 | Box 39 \ 2 Scan171 | |
| Experiments on high-speed steering wobble and its relationship to tyre pressure. | 7th Aug 1925 | Box 39 \ 2 Scan172 | |
| Tyre pressures for the Phantom, comparing instruction book values with test results for balanced wheels. | 11th Sep 1925 | Box 39 \ 2 Scan173 | |
| Decision not to change tyre pressures on the 20 HP chassis to address high-speed wobbles. | 1st Oct 1925 | Box 39 \ 2 Scan174 | |
| Inquiring about the compatibility of a new Dunlop light pattern wheel with standard tyres to ensure global availability for customers. | 30th Oct 1925 | Box 39 \ 2 Scan175 | |
| Dunlop tyres for the 40/50 and 20 HP models, including recommended tyre pressures and shock damper adjustments. | 27th Oct 1925 | Box 39 \ 2 Scan176 | |
| Testing Dunlop tyres, recommended pressures, and their effect on steering. | 31th Oct 1925 | Box 39 \ 2 Scan177 | |
| Steering tests carried out on Chassis 93-NK at various tyre pressures. | 12th Jun 1925 | Box 39 \ 2 Scan178 | |
| Incorrect tyre pressure advice in the instruction book, prompted by a 10,000-mile test in France. | 16th Nov 1925 | Box 39 \ 2 Scan179 | |
| Updated tyre pressures for the 40/50 HP Chassis Instruction Book. | 17th Nov 1925 | Box 39 \ 2 Scan180 | |
| Steering, tyre pressures, hydraulic dampers, and axle improvements. | 18th Nov 1925 | Box 39 \ 2 Scan181 | |
| Recommended tyre pressures for 20 HP cars, considering high speed wobbles and Dunlop Company's advice. | 8th Dec 1925 | Box 39 \ 2 Scan182 | |
| Letter to Dunlop Rubber Co. regarding tyre pressures and axle weights for chassis. | 15th Feb 1926 | Box 39 \ 2 Scan183 | |
| Tyre pressure recommendations for different axle loads and passenger numbers. | 15th Feb 1926 | Box 39 \ 2 Scan184 | |
| Concluding page of a letter discussing vehicle passenger capacity. | 15th Feb 1936 | Box 39 \ 2 Scan185 | |
| Recommended tyre pressures from the Dunlop Company for various chassis weights. | 16th Mar 1926 | Box 39 \ 2 Scan186 | |
| Comparing the suspension performance of a Lancia Lambda to the 20 HP and Silver Ghost models. | 26th Apr 1926 | Box 39 \ 2 Scan187 | |
| Design and friction characteristics of Lancia Lambda rear springs. | 26th Apr 1926 | Box 39 \ 2 Scan188 | |
| Tyre pressures for medium pressure tyres and well base rim combinations for 40/50 HP and 20 HP chassis. | 21th Jun 1926 | Box 39 \ 2 Scan189 | |
| Requesting the preparation of printed tyre pressure instructions for New Phantom customers. | 25th Oct 1926 | Box 39 \ 2 Scan190 | |
| Effects of low pressure tyres and tyre wear on the steering of the 40/50 HP model. | 29th Oct 1926 | Box 39 \ 2 Scan191 | |
| Tyre manufacturing defects, such as varying tread sections, which can lead to poor steering and vibration. | 6th Jan 1927 | Box 39 \ 2 Scan192 | |
| Fitting of new well base wheels and tyres to a test chassis. | 6th Jan 1927 | Box 39 \ 2 Scan193 | |
| Response to a query on tyre pressures and arrangements for a mislaid instruction book. | 5th Jan 1927 | Box 39 \ 2 Scan194 | |
| Letter from Melbourne regarding tyre pressures and steering on Phantom models, suggesting modifications for Australian road conditions. | 22th Nov 1926 | Box 39 \ 2 Scan195 | |
| Recommending an alteration to the instruction book regarding front tire pressure after testing. | 9th Nov 1927 | Box 39 \ 2 Scan196 | |
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