| Description | Date | Identifier | |
| Instructing the stores to return 5 wheels fitted with 7' balloon tyres to the makers, Dunlop. | 3rd Jun 1924 | Box 53 \ 2 Scan107 | |
| Staff holidays, a request to borrow a car, and a proposal to test semi-balloon tyres. | 3rd Jun 1924 | Box 53 \ 2 Scan108 | |
| Arrangements with the Dunlop Company for rebuilding wheels and supplying balloon tyres for 40/50 HP cars in France. | 4th Jun 1924 | Box 53 \ 2 Scan109 | |
| Requesting an update on sourcing a set of semi-balloon tyres complete with wheels for a Beatonson car. | 3rd Jun 1924 | Box 53 \ 2 Scan110 | |
| Literature from Firestone Tyre & Rubber Company concerning their tests on balloon tyres. | 24th Jun 1924 | Box 53 \ 2 Scan111 | |
| Widening of the Goshawk frame and track to accommodate 4-wheel brakes and semi-balloon tyres. | 25th Jun 1924 | Box 53 \ 2 Scan112 | |
| Summarizing opinions on semi-balloon tyres and recommending further testing. | 1st Jul 1924 | Box 53 \ 2 Scan113 | |
| Trial of Semi-Balloon Dunlop Tyres on a 20 HP car, noting their comfort, noisy treads, and heavy steering at low speeds. | 2nd Jul 1924 | Box 53 \ 2 Scan114 | |
| Technical issues of using semi-balloon type tyres, including clearances, steering lock, noise, and standardisation. | 3rd Jul 1924 | Box 53 \ 2 Scan115 | |
| The standardisation of semi-balloon type tyres and the required steering circle for 20 HP and 40/50 HP models. | 7th Jul 1924 | Box 53 \ 2 Scan116 | |
| Letter discussing increased leverage for steering gear to accommodate balloon tires and proposing a new standard. | 7th Jul 1924 | Box 53 \ 2 Scan117 | |
| Internal query about the effect of balloon tyres on wheel circumference and car performance. | 10th Jul 1924 | Box 53 \ 2 Scan118 | |
| Steering adjustments required for balloon tyres. | 18th Jul 1924 | Box 53 \ 2 Scan119 | |
| Internal query regarding the compatibility of balloon tyres with front-wheel brakes and potential clearance issues. | 24th Jul 1924 | Box 53 \ 2 Scan120 | |
| Receipt of tyres, tubes, and wheels from the Dunlop Rubber Co. for a 40/50 HP chassis. | 7th Aug 1924 | Box 53 \ 2 Scan121 | |
| Correspondence from Dunlop regarding the supply of wheels and tyres for a 10,000-mile test. | 1st Aug 1924 | Box 53 \ 2 Scan122 | |
| Diagram illustrating steering lock clearances for 34' x 7.3' balloon tyres on a 44 P.K. model. | 3rd Sep 1924 | Box 53 \ 2 Scan123 | |
| Wheel rim fouling with balloon tyres and lock circle diameters for a 44-PK car. | 3rd Sep 1924 | Box 53 \ 2 Scan124 | |
| Request for a 'Brown Goshawk' (4-G-11) car to be delivered to the Russell Hotel. | 6th Sep 1924 | Box 53 \ 2 Scan125 | |
| Steering issues on Goshawks, relating to low-pressure tyres and potential causes. | 8th Sep 1924 | Box 53 \ 2 Scan126 | |
| Wheels for low-pressure balloon tyres fouling the cross steering levers on 40/50 HP cars with 4-wheel brakes. | 23th Sep 1924 | Box 53 \ 2 Scan127 | |
| Requesting an order for a set of wheels and balloon tyres for the 20 HP model. | 25th Sep 1924 | Box 53 \ 2 Scan128 | |
| Notice regarding the re-building of Dunlop detachable wire wheels to accommodate cord balloon tyres. | 1st Oct 1924 | Box 53 \ 2 Scan129 | |
| Invitation from the Dunlop Rubber Co. Ltd. to view the manufacturing and testing of balloon cord tyres. | 6th Oct 1924 | Box 53 \ 2 Scan130 | |
| Confirming a visit to the Dunlop Rubber Company to see the manufacture of Balloon Cord Tyres. | 7th Oct 1924 | Box 53 \ 2 Scan131 | |
| Dunlop Rubber Co. Ltd. Balloon Cord Tyres, requesting the names of departmental representatives. | 10th Oct 1924 | Box 53 \ 2 Scan132 | |
| Modifications to the cross steering lever for a 40/50 HP chassis fitted with balloon tyres. | 9th Oct 1924 | Box 53 \ 2 Scan133 | |
| Forwarding a copy of a letter sent to the Dunlop Rubber Co. Ltd. for guidance. | 9th Oct 1924 | Box 53 \ 2 Scan134 | |
| Letter accepting an invitation from Dunlop Rubber Co. Ltd. to witness the manufacture and testing of Balloon Cord Tyres. | 9th Oct 1924 | Box 53 \ 2 Scan135 | |
| Suitability of the E.A.C. vehicle for balloon tyres and related testing. | 16th Oct 1924 | Box 53 \ 2 Scan136 | |
| Secret memo discussing the design and testing challenges of fitting balloon tyres to the EAC.11 model. | 17th Oct 1924 | Box 53 \ 2 Scan137 | |
| Continued discussion on the wheels and tyres for the 20HP car. | 21th Oct 1924 | Box 53 \ 2 Scan138 | |
| Testing of balloon tyres and a revised axle for 10,000 miles in France before use. | 21th Oct 1924 | Box 53 \ 2 Scan139 | |
| The suitability and faults of the Dunlop Jack and Balloon Tyres for 20 HP cars. | 23th Oct 1924 | Box 53 \ 2 Scan140 | |
| Proposed address by The Dunlop Rubber Co. Ltd. on the subject of Balloon Tyres. | 10th Nov 1924 | Box 53 \ 2 Scan141 | |
| Link between high-speed steering wobble and the use of balloon tyres. | 29th Nov 1924 | Box 53 \ 2 Scan142 | |
| Performance of balloon tyres and associated steering wobble issues on various car models. | 29th Nov 1924 | Box 53 \ 2 Scan143 | |
| Letter to Dunlop requesting correct inner tubes for low pressure tyres on a 20 HP car. | 1st Dec 1924 | Box 53 \ 2 Scan144 | |
| Correspondence from Dunlop regarding the supply of inner tubes with shorter valves for a 20 HP car. | 2nd Dec 1924 | Box 53 \ 2 Scan145 | |
| Returning 5 Dunlop inner tubes for 20 HP balloon tyres to the makers for replacement. | 15th Dec 1924 | Box 53 \ 2 Scan146 | |
| Five Dunlop Inner Tubes for 20 HP Balloon Tyres to be sent to Dunlop Rubber Co Ltd. | 17th Dec 1924 | Box 53 \ 2 Scan147 | |
| Urgent need for test results on different sizes of balloon tyres. | 23th Dec 1924 | Box 53 \ 2 Scan148 | |
| The receipt of Dunlop wire wheels with balloon tyres for experimental purposes on chassis 22-EU and 45-EU. | 24th Dec 1924 | Box 53 \ 2 Scan149 | |
| Testing of new Dunlop balloon tyres and the policy for customer enquiries. | 29th Dec 1924 | Box 53 \ 2 Scan150 | |
| The performance and limitations of a Dunlop jack designed for balloon tyres. | 1st Dec 1924 | Box 53 \ 2 Scan151 | |
| Requesting an update on the progress of tests for Dunlop Balloon Tyres on the 40/50 HP model. | 26th Jan 1925 | Box 53 \ 2 Scan152 | |
| The steering trouble experienced when fitting Dunlop balloon tyres. | 28th Jan 1925 | Box 53 \ 2 Scan153 | |
| Letter from Dunlop Rubber Co. Ltd. requesting performance data on two sets of tyres. | 10th Feb 1925 | Box 53 \ 2 Scan154 | |
| Continuation sheet from Dunlop Rubber Co. Ltd. concerning general comments on tyres. | 5th Mar 1925 | Box 53 \ 2 Scan155 | |
| Tyre suitability and road vibrations on a 40/50 chassis. | 5th Mar 1925 | Box 53 \ 2 Scan156 | |
| Fitting of balloon tyres to Mr. Royce's All-Weather Torpedo, noting safety concerns for the front wheels. | 20th May 1925 | Box 53 \ 2 Scan157 | |
| Issuance of instructions for balloon tyres on 20-HP and 40/50 HP models. | 21th May 1925 | Box 53 \ 2 Scan158 | |
| The unsuitability of balloon tyres for 20 HP and 40/50 HP chassis with FWB. | 27th May 1925 | Box 53 \ 2 Scan159 | |
| Letter from Dunlop requesting a performance report on tyres fitted to Mr. Royce's car. | 24th Jun 1925 | Box 53 \ 2 Scan160 | |
| Requesting the procurement of six balloon covers and tyres. | 1st Jul 1925 | Box 53 \ 2 Scan161 | |
| Vehicle handling improvements by adjusting front shock absorbers when using new semi-balloon tyres. | 24th Jul 1925 | Box 53 \ 2 Scan162 | |
| Alarming report on high speed steering wobbles, comparing the New Phantom with the Silver Ghost. | 1st Aug 1925 | Box 53 \ 2 Scan163 | |
| Testing two 20 HP cars, focusing on balloon tyres, damping, and steering performance. | 8th Aug 1925 | Box 53 \ 2 Scan164 | |
| Potential improvements and modifications to a vehicle's steering system. | 8th Aug 1925 | Box 53 \ 2 Scan165 | |
| Technical memorandum discussing high speed steering wobble and potential modifications to the steering arm and dampers. | 8th Aug 1925 | Box 53 \ 2 Scan166 | |
| Mitigating high-speed wobbles through weight redistribution, tyre balancing, and a new fluid damper design for the 40/50 car. | 8th Aug 1925 | Box 53 \ 2 Scan167 | |
| Handling issues of the New Phantom compared to the Silver Ghost, focusing on weight, chassis flexibility, steering, and tyres. | 21th Aug 1925 | Box 53 \ 2 Scan168 | |
| Letter from F.H. Royce regarding the issue of high-speed wobbles in relation to low-pressure tyres and wheel balance. | 21th Aug 1925 | Box 53 \ 2 Scan169 | |
| Letter to Dunlop Rubber Co. seeking a mathematical explanation for high-speed steering wobbles. | 21th Aug 1925 | Box 53 \ 2 Scan170 | |
| Conclusion on the cause of wheel wobbles being an out-of-balance force from insufficiently accurate wheel balancing. | 15th Sep 1925 | Box 53 \ 2 Scan171 | |
| From 'R.' detailing modifications required for the Goshawk I chassis, including smaller wheels and specific tyres. | 15th Sep 1925 | Box 53 \ 2 Scan172 | |
| Request from the Dunlop Company for mileage and performance feedback on tyres supplied for testing. | 23th Sep 1925 | Box 53 \ 2 Scan173 | |
| Tests conducted to understand high-speed steering wobbles caused by tyres running out of true. | 16th Sep 1925 | Box 53 \ 2 Scan174 | |
| Follow-up memo from ROY chasing a reply regarding performance tests of Dunlop tyres supplied on preferential terms. | 6th Oct 1925 | Box 53 \ 2 Scan175 | |
| Request from the Dunlop Company for mileage and feedback on tested Triple Block Pattern Tread Balloon Covers. | 23th Sep 1925 | Box 53 \ 2 Scan176 | |
| Letter discussing steering difficulties with balloon tyres at high speeds, comparing experiences with Nash and Pierce Arrow cars. | 12th Oct 1925 | Box 53 \ 2 Scan177 | |
| Letter from Aktiebolaget A. Wiklunds discussing experiences with balloon tyres on NASH and PIERCE-ARROW cars. | 5th Oct 1925 | Box 53 \ 2 Scan178 | |
| The effects of fitting balloon tyres to two new Phantom cars with wagonette bodies for shooting purposes in Bharatpur. | 23th Oct 1925 | Box 53 \ 2 Scan179 | |
| The technical reasons against fitting low pressure balloon tyres to the New Phantom cars due to high-speed wobbles. | 26th Oct 1925 | Box 53 \ 2 Scan180 | |
| The effects of high and low-pressure tyres on vehicle wobble. | 26th Oct 1925 | Box 53 \ 2 Scan181 | |
| Use of Dunlop semi-balloon tyres on a 'New Phantom' and the associated risk of steering wobble. | 14th Jan 1926 | Box 53 \ 2 Scan182 | |
| Recommendation against fitting semi balloon tyres to Lord Montagu's Phantom due to the risk of steering wobble. | 8th Jan 1926 | Box 53 \ 2 Scan183 | |
| From ROY to Hs. about a follow-up query from Dunlop regarding triple stud balloon tyres. | 30th Jan 1926 | Box 53 \ 2 Scan184 | |
| Investigation into front wheel wobble, the effect of toe-in, and issues with front wheel brakes. | 1st Feb 1926 | Box 53 \ 2 Scan185 | |
| Research, observations, and theories regarding front wheel wobble. | 2nd Oct 1926 | Box 53 \ 2 Scan186 | |
| Improvements to the Phantom suspension, focusing on spring flexibility, shock dampers, and tyre pressure. | 25th Feb 1926 | Box 53 \ 2 Scan187 | |
| Technical comparison of the New Phantom and Silver Ghost models, focusing on road noise, suspension, and performance. | 26th Feb 1926 | Box 53 \ 2 Scan188 | |
| Effectiveness of hydraulic shock dampers at reducing steering wobble and proposing their fitting for a 10,000-mile test. | 26th Feb 1926 | Box 53 \ 2 Scan189 | |
| Pressing for the adoption of hydraulic shock dampers, semi-balloon tyres, and a lighter front axle for Phantom & Goshawk models. | 27th Feb 1926 | Box 53 \ 2 Scan190 | |
| Letter to Dunlop inquiring about tyre drawings and specifications to address high-speed wobble issues. | 13th Mar 1926 | Box 53 \ 2 Scan191 | |
| Visit to Messrs. Dunlop to discuss their triple stud tread tyres, focusing on noise, non-skid properties, and wear. | 1st May 1926 | Box 53 \ 2 Scan192 | |
| Tyre types, wear patterns, comfort, and recommendations for 40/50 HP and 20 HP models. | 1st May 1926 | Box 53 \ 2 Scan193 | |
| Tyre performance focusing on wobble tests and comparisons between different tyre constructions. | 16th Mar 1926 | Box 53 \ 2 Scan194 | |
| Copy of recommended tyre pressures from Dunlop Co. for various chassis and tyre types. | 16th Mar 1926 | Box 53 \ 2 Scan195 | |
| Letter from Dunlop Rubber Co Ltd discussing tyre ply construction for various vehicles, including the King's car. | 18th Mar 1926 | Box 53 \ 2 Scan196 | |
| Benefits of low-pressure tyres over high-pressure tyres and proposing a specific setup for better ride quality. | 24th Mar 1926 | Box 53 \ 2 Scan197 | |
| Experimental tests on different tyre types, focusing on performance issues like high-speed wobbles, noise, and skidding. | 25th Mar 1926 | Box 53 \ 2 Scan198 | |
| Low-pressure tyre issues on the Phantom model and considerations for alternative oils. | 25th Mar 1926 | Box 53 \ 2 Scan199 | |
| Comparison of the composition and availability of Prices and Wakefields brand oils, noting their use in customer and company cars. | 1st Mar 1926 | Box 53 \ 2 Scan200 | |
| Recommendations for tyre configurations and a query about the standardisation of oils. | 1st Mar 1926 | Box 53 \ 2 Scan201 | |
| Standardization of fitting semi-low pressure tyres to the 20 HP chassis. | 31th Mar 1926 | Box 53 \ 2 Scan202 | |
| High-speed steering wobble on car 7-EX with medium pressure tyres. | 1st Apr 1926 | Box 53 \ 2 Scan203 | |
| Comparison diagram showing profiles, dimensions, and load ratings for four different tyres. | 1st Apr 1926 | Box 53 \ 2 Scan204 | |
| The condition and mileage of eight Dunlop tyres used during a 9000-mile test on car I2 EX - EAC VIII. | 11th Jun 1926 | Box 53 \ 2 Scan205 | |
| The return of Dunlop medium pressure tyres to the manufacturer for examination following a 10,000-mile test in France. | 11th Jun 1926 | Box 53 \ 2 Scan206 | |
| | | | |
