| Description | Date | Identifier | |
| Letter from Dunlop Rubber Co. Ltd. regarding permission to discuss tyres for the Marajah of Pattiala. | 6th Jun 1928 | Box 53 \ 3 Scan105 | |
| Standardisation and issues with balloon tyres for the 20 HP chassis. | 5th Jul 1928 | Box 53 \ 3 Scan106 | |
| Introduction of Balloon Tyres for the 20 HP Chassis. | 10th Jul 1928 | Box 53 \ 3 Scan107 | |
| Pros and cons of different balloon tyre and rim sizes for the 20HP model. | 11th Jul 1928 | Box 53 \ 3 Scan108 | |
| Adoption of low-pressure tyres and suitable wheel sizes for the 20 HP car model. | 2nd Jul 1928 | Box 53 \ 3 Scan109 | |
| Letter from Dunlop Rubber Co. Ltd. regarding correspondence with the Managing Director for India about the Maharaja of Patiala's opinion. | 12th Jul 1928 | Box 53 \ 3 Scan110 | |
| Letter discussing the suitability of Balloon Tyres for cars owned by Indian Maharajas for Shikar (hunting) purposes. | 22th Jun 1928 | Box 53 \ 3 Scan111 | |
| Letter discussing tyre suitability for the Maharaja of Patiala's cars used for hunting. | 12th Jul 1928 | Box 53 \ 3 Scan112 | |
| Dunlop Low Pressure Tyres for India. | 18th Jul 1928 | Box 53 \ 3 Scan113 | |
| Letter from Bombay discussing the suitability of Balloon vs High Pressure tyres, and a new 'Medallion' tyre, for cars used for hunting. | 28th Jun 1928 | Box 53 \ 3 Scan114 | |
| Letter from Dunlop Rubber Co. concerning discretionary powers for tyre provision and the improved Medallion Tyre project. | 19th Jul 1928 | Box 53 \ 3 Scan115 | |
| Selection of tyres (Balloon, High Pressure, or new Medallion) for a customer in India. | 27th Jun 1928 | Box 53 \ 3 Scan116 | |
| Weakness of Dunlop low-pressure balloon tyres under Indian hunting conditions. | 23th Jul 1928 | Box 53 \ 3 Scan117 | |
| Potential improvements to vehicle riding qualities. | 23th Jul 1928 | Box 53 \ 3 Scan118 | |
| Order of 12 sets of 6' balloon tyres on 20' rims for the 20 HP model. | 7th Aug 1928 | Box 53 \ 3 Scan119 | |
| The fitment of Dunlop low pressure tyres on the first 'SS' chassis. | 19th Sep 1928 | Box 53 \ 3 Scan120 | |
| Letter to the Dunlop Rubber Co. regarding the supply and testing of various tyres for a 40/50 HP car. | 25th Sep 1928 | Box 53 \ 3 Scan121 | |
| Balloon tyres and the Barkerlite demonstration body for the 20 HP car. | 7th Sep 1928 | Box 53 \ 3 Scan122 | |
| The poor mileage performance of Silent Tread Tyres. | 24th Oct 1928 | Box 53 \ 3 Scan123 | |
| Clarifying that the term 'Fort' refers to tyre dimensions and the tread type is the RR silent tread. | 8th Nov 1928 | Box 53 \ 3 Scan124 | |
| Letter from Rolls-Royce of America to Rolls-Royce Ltd. regarding the failure of American Bosch ignitions and proposed changes. | 12th Sep 1927 | Box 53 \ 3 Scan125 | |
| Page two of a letter regarding the avoidance of failure in the use of a ballast. | 12th Sep 1927 | Box 53 \ 3 Scan126 | |
| Proposal to substitute American Bosch ignition with De Jon ignition. | 15th Sep 1927 | Box 53 \ 3 Scan127 | |
| Proposal for a temporary change to a double head battery ignition system, citing reduced maintenance and noise. | 15th Sep 1927 | Box 53 \ 3 Scan128 | |
| The testing of DeJon Ignition heads and coils, detailing a bench test and a road test on vehicle MX-2. | 5th Apr 1927 | Box 53 \ 3 Scan129 | |
| Proposal to adopt De Jon ignition to replace the American Bosch ignition due to supply issues. | 13th Sep 1927 | Box 53 \ 3 Scan130 | |
| American Standardisation Sheets and the necessity of a 10,000-mile test. | 3rd Oct 1927 | Box 53 \ 3 Scan131 | |
| Performance of different battery ignition systems, specifically comparing De Jon, Delco-Remy, and Bosch components. | 6th Oct 1927 | Box 53 \ 3 Scan132 | |
| Ignition contact breaker improvements, comparing designs, materials, and developments with competitors like Delco-Remy and Bosch. | 1st Oct 1927 | Box 53 \ 3 Scan133 | |
| The design and use of ignition coils, comparing models with and without ballast resistance. | 6th Oct 1927 | Box 53 \ 3 Scan134 | |
| Notification regarding a delay in sending DeJon heads due to necessary detail changes. | 2nd Nov 1927 | Box 53 \ 3 Scan135 | |
| Test results for a 6-volt armoured ignition coil (DeJon coil) run without a ballast for 15 and 44 hours. | 2nd Nov 1927 | Box 53 \ 3 Scan136 | |
| Requesting the construction and prolonged testing of a steering column switch using a new mouldensite rotor. | 27th Apr 1923 | Box 53 \ 3 Scan137 | |
| Proposal to test and potentially adopt Mouldensite as a replacement for the rubber base in the 40/50 chassis steering column switch. | 27th Apr 1923 | Box 53 \ 3 Scan138 | |
| Endurance test of a Steering Column Ignition Switch fitted with a bakelite insulated drum. | 10th May 1923 | Box 53 \ 3 Scan139 | |
| Inspection report detailing wear and damage to a switch after a 25-hour endurance test. | 24th Jan 1919 | Box 53 \ 3 Scan140 | |
| Recommending the substitution of 'mouldensite' for 'stabalite' in steering column ignition switch drums. | 11th May 1923 | Box 53 \ 3 Scan141 | |
| Test report on a steering column ignition switch fitted with a Mouldensite insulated drum. | 11th May 1923 | Box 53 \ 3 Scan142 | |
| Transferring a set of steel artillery wheels from Dunlop, no longer needed for chassis 226, to the Experimental Department for testing. | 5th May 1923 | Box 53 \ 3 Scan143 | |
| Need to push through the testing of steel artillery wheels as an alternative to disc or wire wheels. | 9th May 1923 | Box 53 \ 3 Scan144 | |
| Fitting and continuous use of steel artillery wheels on the 10,000 miles car. | 10th May 1923 | Box 53 \ 3 Scan145 | |
| B.J. to Hs. requesting the latest news on Dunlop Artillery Wheels. | 25th May 1923 | Box 53 \ 3 Scan146 | |
| 5,000-mile performance of Dunlop steel artillery wheels and forthcoming standardisation sheets. | 26th May 1923 | Box 53 \ 3 Scan147 | |
| Weight comparison between Dunlop Artillery wheels and Wire wheels for a 20 HP car. | 31th May 1923 | Box 53 \ 3 Scan148 | |
| Query regarding the satisfactory testing and standardization of Dunlop Steel Artillery Wheels. | 8th Jun 1923 | Box 53 \ 3 Scan149 | |
| The testing and modification of Dunlop steel artillery wheels. | 11th Jun 1923 | Box 53 \ 3 Scan150 | |
| Requesting test results for Dunlop Steel Artillery Wheels and querying further testing for design alterations. | 12th Jun 1923 | Box 53 \ 3 Scan151 | |
| Supply and potential redesign of Dunlop Steel Artillery Wheels. | 22th Jun 1923 | Box 53 \ 3 Scan152 | |
| Instructions to supply and fit an experimental set of 6 steel Artillery wheels for 20 HP Chassis No. 65-H.7. | 11th Jul 1923 | Box 53 \ 3 Scan153 | |
| Standardisation report for Dunlop Artillery Steel Wheels as an alternative to wire wheels. | 22th Jun 1923 | Box 53 \ 3 Scan154 | |
| Requesting permission to use Dunlop Steel Artillery wheels as an alternative to wire wheels. | 1st Jun 1923 | Box 53 \ 3 Scan155 | |
| Attachment of a standard sheet for Dunlop Artillery Steel Wheels. | 2nd Jan 1924 | Box 53 \ 3 Scan156 | |
| Standardisation sheet for Dunlop artillery steel wheels for different chassis models. | 11th Jan 1924 | Box 53 \ 3 Scan157 | |
| Lack of a standard sheet for steel wheels on the 40/50 HP model and an offer to test them. | 12th Jan 1924 | Box 53 \ 3 Scan158 | |
| Recommendation to issue a standardisation sheet for steel wheels as an alternative for customers who refuse wire wheels. | 15th Jan 1924 | Box 53 \ 3 Scan159 | |
| Standardisation document for Steel Artillery Wheels as an alternative to wire wheels. | 15th Jan 1924 | Box 53 \ 3 Scan160 | |
| Steering problems and dangers associated with fitting front brakes on cars with steel artillery wheels. | 4th Apr 1924 | Box 53 \ 3 Scan161 | |
| Which types of wheels should be forbidden, focusing on steel artillery wheels and their suitability for front brakes. | 3rd Apr 1924 | Box 53 \ 3 Scan162 | |
| Fitting of front wheel brakes to cars equipped with artillery wheels. | 3rd Apr 1924 | Box 53 \ 3 Scan163 | |
| Difficulties and implications of fitting front wheel brakes to cars with artillery wheels. | 2nd Apr 1924 | Box 53 \ 3 Scan164 | |
| The challenges and strategy for supplying artillery wheels with front wheel brakes. | 2nd Apr 1923 | Box 53 \ 3 Scan165 | |
| The incompatibility of artillery type wheels with front wheel brakes for a new detachable design. | 31th Mar 1924 | Box 53 \ 3 Scan166 | |
| Customer compensation options during brake fitting. | 21th Mar 1924 | Box 53 \ 3 Scan167 | |
| Use of Sankey type steel artillery wheels and associated hub designs. | 26th May 1924 | Box 53 \ 3 Scan168 | |
| New design proposal for artillery wheels and an assessment of existing brake drums. | 29th May 1924 | Box 53 \ 3 Scan169 | |
| The failure of Dunlop steel artillery wheels on chassis 1-GW after 2,000 kilometers. | 12th Jun 1924 | Box 53 \ 3 Scan170 | |
| Replacement of Dunlop steel artillery wheels with wire wheels for chassis 1-GW. | 13th Jun 1924 | Box 53 \ 3 Scan171 | |
| Procedure for a new design and testing of Dunlop steel wheels. | 7th Jul 1924 | Box 53 \ 3 Scan172 | |
| Modifications for steel artillery wheels, including a novel Michelin fixing with a patentable self-adjusting washer system. | 16th Jul 1924 | Box 53 \ 3 Scan173 | |
| Design and modification of steering artillery wheels for front and back axles. | 17th Jul 1924 | Box 53 \ 3 Scan174 | |
| Secret memo regarding a new design for steel artillery wheels on Dunlop hubs, involving modifications to the hub and brake drum. | 18th Jul 1924 | Box 53 \ 3 Scan175 | |
| Secret memorandum discussing an alternative mounting method for steel artillery wheels. | 19th Jul 1924 | Box 53 \ 3 Scan176 | |
| Faulty welds on steel artillery wheels for chassis 1-CW, attributing the problem to Dunlop Co. | 19th Jul 1924 | Box 53 \ 3 Scan177 | |
| Interchangeability of steel and wire wheels, and the potential noise from disc wheels. | 17th Sep 1924 | Box 53 \ 3 Scan178 | |
| The arrival of a special set of 12-spoke Steel Artillery Wheels from Dunlop. | 18th Dec 1924 | Box 53 \ 3 Scan179 | |
| Standardization test for new steel artillery wheels and hubs on the 40/50 HP chassis. | 20th Dec 1924 | Box 53 \ 3 Scan180 | |
| Receipt and proposed testing of new type steel artillery wheels. | 23th Dec 1924 | Box 53 \ 3 Scan181 | |
| Testing of new type steel artillery wheels versus standard wire wheels for the 40/50 HP 'V' series chassis. | 29th Dec 1924 | Box 53 \ 3 Scan182 | |
| Testing of new type steel artillery wheels for the 40/50 HP model. | 30th Dec 1924 | Box 53 \ 3 Scan183 | |
| Testing method for new 40/50 HP steel artillery wheels and potential cost sharing with Dunlop. | 7th Jan 1925 | Box 53 \ 3 Scan184 | |
| Testing new 40/50 type steel artillery wheels on a bumping rig. | 1st Jan 1925 | Box 53 \ 3 Scan185 | |
| Inquiry about the status of experiments on steel wheels for front wheel brakes, specifically the 'bumping' test. | 26th Jan 1925 | Box 53 \ 3 Scan186 | |
| Testing of steel wheels suitable for front wheel brakes. | 28th Jan 1925 | Box 53 \ 3 Scan187 | |
| Starting the road test and sales evaluation for new steel artillery wheels on the 40/50 HP chassis. | 24th Feb 1925 | Box 53 \ 3 Scan188 | |
| Request from the Sales department for steel wheels suitable for front brakes and the urgency of conducting trial runs. | 24th Feb 1925 | Box 53 \ 3 Scan189 | |
| The need to test steel wheels on the 40/50 chassis before ordering a quantity. | 23th Feb 1925 | Box 53 \ 3 Scan190 | |
| The 40/50 HP. Chassis with steel wheels. | 27th Feb 1925 | Box 53 \ 3 Scan191 | |
| Communication about road testing and releasing new steel wheels for the 40/50 HP model. | 25th Feb 1925 | Box 53 \ 3 Scan192 | |
| On satisfactory tests of steel artillery wheels for cars with four-wheel brakes, and arranging a viewing in London. | 11th Mar 1925 | Box 53 \ 3 Scan193 | |
| Technical memo providing feedback on steel wheels, axle control, and springing for a car with four-wheel brakes. | 16th Mar 1925 | Box 53 \ 3 Scan194 | |
| Standardisation document for steel artillery wheels suitable for front wheel brakes. | 20th Mar 1925 | Box 53 \ 3 Scan195 | |
| Supply, testing, and fitting of new 20 HP steel artillery wheels. | 5th May 1925 | Box 53 \ 3 Scan196 | |
| The distinguishing letters and numbers for Steel Artillery and Wire Wheels and Hubs. | 11th May 1925 | Box 53 \ 3 Scan197 | |
| Letter from Dunlop Rim & Wheel Co. Ltd. proposing a new reference system for hubs on steel and wire wheels. | 8th May 1925 | Box 53 \ 3 Scan198 | |
| Confirming no objection to new distinguishing letters and numbers for wheels and hubs on 40/50HP and 20-HP chassis. | 13th May 1925 | Box 53 \ 3 Scan199 | |
| Successfully shortening steel artillery wheel hubs and proposing to do the same for wire wheel hubs. | 13th Oct 1925 | Box 53 \ 3 Scan200 | |
| Use of artillery wheels compared to wire and disc wheels. | 24th Oct 1925 | Box 53 \ 3 Scan201 | |
| Balance weight scheme for 20 HP and 40/50 steel artillery wheels. | 23th Jul 1926 | Box 53 \ 3 Scan202 | |
| Mounting of steel artillery wheels on a Phantom with a new axle, including design modifications. | 1st Aug 1926 | Box 53 \ 3 Scan203 | |
| Testing experimental steel artillery wheels with pressed fixed hubs on a 20 HP chassis. | 24th Aug 1926 | Box 53 \ 3 Scan204 | |
| | | | |
