| Description | Date | Identifier | |
| Blueprint sketch showing the cross-sectional shape and dimensions of a Dunlop 7.00-16 E.L.P. inflated tyre. | 1st Dec 1938 | Box 157 \ 3 scan0060 | |
| Product design sketch showing the approximate inflated shape and dimensions of a Dunlop tyre. | 3rd Feb 1939 | Box 157 \ 3 scan0061 | |
| Invoices for racing covers and tubes supplied to Franco Britannic Autos Ltd. | 25th May 1939 | Box 157 \ 3 scan0062 | |
| Order and payment for Dunlop Racing Covers. | 26th May 1939 | Box 157 \ 3 scan0063 | |
| Letter from Dunlop Rubber Co. to W.A. Robotham proposing a meeting to discuss technical liaison and a change in commercial contact. | 2nd Jun 1939 | Box 157 \ 3 scan0064 | |
| Letter from Dunlop Rubber Co. Ltd. regarding the production of equipment and details of special construction tyres. | 2nd Jun 1939 | Box 157 \ 3 scan0065 | |
| List of tyre covers with serial numbers and handwritten annotations for allocation. | 7th Jun 1939 | Box 157 \ 3 scan0066 | |
| Internal request to order specific sizes of Dunlop tyre covers. | 8th Jun 1939 | Box 157 \ 3 scan0067 | |
| Order for four 7.00 x 15 Dunlop Fort tyre covers for a Buick. | 12th Jun 1939 | Box 157 \ 3 scan0068 | |
| Letter from Dunlop Rubber Co. confirming the dispatch of five improved construction tyres for testing. | 12th Jun 1939 | Box 157 \ 3 scan0069 | |
| Letter to Dunlop Rubber Co. regarding the importance of tyre performance and the need for improved technical service. | 13th Jun 1939 | Box 157 \ 3 scan0070 | |
| Letter to A. Healey Esq. concerning the performance and testing of tyres from Michelin and Dunlop. | 13th Jun 1939 | Box 157 \ 3 scan0071 | |
| Letter to A. Healey, Esq. discussing competitor tyres for the Bentley. | 13th Jun 1939 | Box 157 \ 3 scan0072 | |
| The despatch of tyres and tubes to a hotel in France. | 14th Jun 1939 | Box 157 \ 3 scan0073 | |
| Instructing the despatch of 34 tyre covers and tubes to Mr. Waller in Chateauroux, France. | 14th Jun 1939 | Box 157 \ 3 scan0074 | |
| Covering order request to Dunlop Rubber Co. Ltd. for various tyres, tubes, and a rim band. | 20th Jun 1939 | Box 157 \ 3 scan0075 | |
| Letter from Dunlop Rubber Co. Ltd. confirming arrangements for the provision of specific rims and track racing tyres. | 24th Jun 1939 | Box 157 \ 3 scan0076 | |
| Letter to Dunlop Rubber Co. redirecting a delivery of special covers to Derby instead of Brooklands. | 28th Jun 1939 | Box 157 \ 3 scan0077 | |
| Dispatch of 5 Dunlop steel wheels to a Mr. Waller in France. | 29th Jun 1939 | Box 157 \ 3 scan0078 | |
| Letter from Dunlop Rubber Co. confirming the dispatch of a set of 4, 6.50-16 Track Racing Tyres. | 30th Jun 1939 | Box 157 \ 3 scan0079 | |
| Letter from Dunlop Rubber Co. Ltd. regarding the investigation of an overheated and damaged India tyre. | 5th Jul 1939 | Box 157 \ 3 scan0080 | |
| Letter to Dunlop Rubber Co. regarding a proposed visit and the performance of an India tyre at Brooklands. | 6th Jul 1939 | Box 157 \ 3 scan0081 | |
| Letter detailing the status of sourcing and receiving various vehicle parts including tyres, tubes, and an exhaust system. | 7th Jul 1939 | Box 157 \ 3 scan0082 | |
| Letter to Dunlop Rubber Co. requesting track racing tyres and discussing issues with inner tubes and valves. | 10th Jul 1939 | Box 157 \ 3 scan0083 | |
| Confirming orders placed for various sized tyres and tubes from Dunlops. | 12th Jul 1939 | Box 157 \ 3 scan0084 | |
| Letter from Dunlop regarding the supply and specifications of racing tyres and tubes. | 12th Jul 1939 | Box 157 \ 3 scan0085 | |
| Letter to Dunlop Rubber Co. arranging a meeting to discuss a correction figure for curve surfaces. | 14th Jul 1939 | Box 157 \ 3 scan0086 | |
| Tyre types, wheel sizes, and rim specifications for use in France. | 14th Jul 1939 | Box 157 \ 3 scan0087 | |
| Letter from Dunlop Rubber Co. Ltd. concerning the despatch and fitting of track racing tyres and tubes. | 14th Jul 1939 | Box 157 \ 3 scan0088 | |
| Letter from Dunlop Rubber Co., Ltd. to W.A. Robotham regarding a scheduling conflict for a meeting. | 17th Jul 1939 | Box 157 \ 3 scan0089 | |
| Order for six 6.50 x 17 Dunlop Fort covers. | 18th Jul 1939 | Box 157 \ 3 scan0090 | |
| Letter from Dunlop Rubber Co., Ltd. regarding the return of excess and used tyres following tests at Brooklands. | 19th Jul 1939 | Box 157 \ 3 scan0091 | |
| Letter to A. Healey of Dunlop Rubber Co., Ltd. arranging a meeting for lunch. | 20th Jul 1939 | Box 157 \ 3 scan0092 | |
| Letter from Dunlop Rubber Co. Ltd. detailing tyre equipment and pressures from Brooklands tests and suggesting future setups. | 21th Jul 1939 | Box 157 \ 3 scan0093 | |
| Letter from Dunlop Rubber Co., Ltd. regarding an invoice for five returned unused covers. | 21th Jul 1939 | Box 157 \ 3 scan0094 | |
| Internal memorandum detailing a tyre order from Dunlop, including quantities, sizes, and return arrangements. | 21th Jul 1939 | Box 157 \ 3 scan0095 | |
| Letter to Dunlop Rubber Co. Ltd. requesting the revolutions per mile for various track tyres. | 21th Jul 1939 | Box 157 \ 3 scan0096 | |
| Letter from Dunlop Rubber Co., Ltd. to W. A. Robotham arranging a meeting. | 22th Jul 1939 | Box 157 \ 3 scan0097 | |
| Dunlop sending Rayon covers and tubes to Chateauroux. | 25th Jul 1939 | Box 157 \ 3 scan0098 | |
| Supply and testing of Dunlop and Avon tyres for various car models. | 25th Jul 1939 | Box 157 \ 3 scan0099 | |
| Letter from Dunlop Rubber Co. Ltd. detailing tyre revolutions per mile at 100 mph for three specific sizes. | 26th Jul 1939 | Box 157 \ 3 scan0100 | |
| Instruction memo regarding the return of tyre covers and tubes to Dunlop Rubber Co. | 27th Jul 1939 | Box 157 \ 3 scan0101 | |
| Letter from Dunlops and clarifying details on 6' wheels and 5 ½' rims. | 27th Jul 1939 | Box 157 \ 3 scan0102 | |
| Letter from Dunlop Rubber Co. Ltd. requesting to use the skid pan on specific dates. | 28th Jul 1939 | Box 157 \ 3 scan0103 | |
| Letter to The Dunlop Rubber Co. regarding permission to use a skid pan. | 1st Aug 1939 | Box 157 \ 3 scan0104 | |
| Listing failed tyres with loose treads despatched for inspection from Chateauroux. | 8th Aug 1939 | Box 157 \ 3 scan0105 | |
| Confirming no tyres need returning to Dunlops as they collected them from Brooklands themselves. | 9th Aug 1939 | Box 157 \ 3 scan0106 | |
| Order to be placed with The Dunlop Rubber Co. Ltd. for a Fort Cover and Fort Tube. | 9th Aug 1939 | Box 157 \ 3 scan0107 | |
| Letter to Dunlop Rubber Co. about tread separation issues on Rayon tyres tested in France. | 11th Aug 1939 | Box 157 \ 3 scan0108 | |
| Letter from Dunlop Rubber Co. discussing tyre failures and comparing 7-inch and 6.5-inch tyre characteristics. | 16th Aug 1939 | Box 157 \ 3 scan0109 | |
| Requesting a covering order for five sets of 'Rayon' covers and tubes ordered from Dunlops. | 29th Aug 1939 | Box 157 \ 3 scan0110 | |
| Covering order for Dunlop track racing tyres and tubes. | 31th Aug 1939 | Box 157 \ 3 scan0111 | |
| Letter from Dunlop Rubber Co. Ltd. confirming an order for special rayon tyres and seeking advice on proceeding due to the 'international situation'. | 5th Sep 1939 | Box 157 \ 3 scan0112 | |
| Letter to Dunlop Rubber Co., Ltd. urgently requesting a set of tyres. | 7th Sep 1939 | Box 157 \ 3 scan0113 | |
| Letter to Dunlop Rubber Co. Ltd. confirming an order for five 7.60 x 16 4-ply Rayon tyres for a Works Director's car. | 9th Sep 1939 | Box 157 \ 3 scan0114 | |
| Invoices received from Dunlop Rubber Co. Ltd. for a tyre cover and tube. | 12th Sep 1939 | Box 157 \ 3 scan0115 | |
| Request for a covering order for a tyre cover and tube from Dunlop Rubber Co. Ltd. | 15th Sep 1939 | Box 157 \ 3 scan0116 | |
| Confirming a telephone order placed with Dunlop's for a tyre and tube, and requesting a formal order be sent. | 18th Oct 1939 | Box 157 \ 3 scan0117 | |
| Confirming the decision to keep a specific tyre. | 30th Oct 1939 | Box 157 \ 3 scan0118 | |
| Internal request to order 12 Dunlop 7.50 x 16 covers and tubes for use on vehicles 33.G.J. and 4.B.50. | 6th Nov 1939 | Box 157 \ 3 scan0119 | |
| Requesting an official order for a Dunlop tyre and tube, further to a telephone order. | 16th Dec 1939 | Box 157 \ 3 scan0120 | |
| Letter from Dunlop providing tyre rolling radii data for various sizes. | 16th Jan 1940 | Box 157 \ 3 scan0121 | |
| Letter to Dunlop Rubber Co. Ltd. regarding the tyre development programme, including issues with high-speed performance. | 9th Feb 1940 | Box 157 \ 3 scan0122 | |
| Order for ten Dunlop tyre covers. | 25th Apr 1940 | Box 157 \ 3 scan0123 | |
| Official order for five 4-ply tyre covers from Dunlop Rubber Co. Ltd. | 24th Jun 1940 | Box 157 \ 3 scan0124 | |
| Letter to Clan Foundry clarifying a discrepancy in a Dunlop tyre and tube order. | 11th Jul 1940 | Box 157 \ 3 scan0125 | |
| Confirming acceptance of and payment for inner tubes from Dunlops. | 13th Jul 1940 | Box 157 \ 3 scan0126 | |
| Letter to Dunlop Rubber Co. Ltd. about a steering wheel 'nibble' phenomenon on prototype experimental cars. | 10th Oct 1940 | Box 157 \ 3 scan0127 | |
| Letter from Dunlop Rubber arranging a meeting to discuss wartime tyre developments. | 11th Oct 1940 | Box 157 \ 3 scan0128 | |
| Letter to Dunlop Rubber Co. regarding the rapid deterioration of tyres after 4350 miles of testing. | 30th Dec 1940 | Box 157 \ 3 scan0129 | |
| Letter from Dunlop Rubber Co. regarding the collection and future dispatch of experimental tyres. | 3rd Jan 1941 | Box 157 \ 3 scan0130 | |
| Letter to Dunlop requesting updated figures on the increase in radius of tyres at various speeds. | 13th Mar 1941 | Box 157 \ 3 scan0131 | |
| Letter to A. Healey of Dunlop Rubber Co. Ltd. enclosing a copy of a 1925 letter and an attached curve. | 18th Mar 1941 | Box 157 \ 3 scan0132 | |
| Graph showing the increase in effective radius of a 33x5 tyre relative to speed. | 1st Jun 1925 | Box 157 \ 3 scan0133 | |
| Graph showing the increase in a tyre's effective radius in millimetres against speed in miles per hour. | 1st Jun 1925 | Box 157 \ 3 scan0134 | |
| Letter from Dunlop Rubber Co., Ltd. about making up-to-date tyre radius measurements. | 24th Mar 1941 | Box 157 \ 3 scan0135 | |
| Request to send an official order to Dunlop Rubber Co. Ltd. for Trakgrip tyres and tubes already received for use at Clan Foundry. | 1st May 1941 | Box 157 \ 3 scan0136 | |
| Letter from Dunlop Rubber Co., Ltd. apologising for a delay in sending promised tyre data. | 5th Apr 1941 | Box 157 \ 3 scan0137 | |
| The increase in tyre radius at various speeds based on road and machine tests. | 4th Apr 1941 | Box 157 \ 3 scan0138 | |
| Graph showing the increase in radius at various speeds for 6.50 - 16 Dunlop Fort & Standard tyres. | 1st Apr 1941 | Box 157 \ 3 scan0139 | |
| Letter to Dunlop Rubber Co. acknowledging receipt of information on 6.50-16 tyres. | 11th Apr 1941 | Box 157 \ 3 scan0140 | |
| Short typed message postponing a meeting due to unforeseen commitments. | 29th May 1941 | Box 157 \ 3 scan0141 | |
| Telegram from Mmackay Rubber Melsham to Robotham Raycar Derby proposing a meeting. | 29th May 1941 | Box 157 \ 3 scan0142 | |
| Letter from Dunlop Rubber Co. Ltd. detailing experiments on effective tyre diameter at high speeds. | 25th Jun 1925 | Box 157 \ 3 scan0143 | |
| Graph showing the increase in effective radius of a 33x5 tyre against speed under specific load and pressure conditions. | 1st Jun 1925 | Box 157 \ 3 scan0144 | |
| On a daily planner page addressed to Mr Heyman. | 21th Sep 1930 | Box 157 \ 3 scan0145 | |
| Letter from Dunlop Rubber Co. Ltd. regarding the availability of two types of experimental tyres for testing. | 18th Sep 1941 | Box 157 \ 3 scan0146 | |
| Page 2 of a letter discussing experimental tyres, high-speed tyres, and tank tracks. | 20th Oct 1941 | Box 157 \ 3 scan0147 | |
| Letter from Dunlop Rubber Co. Ltd. chasing up a requirement for experimental tyres. | 20th Oct 1941 | Box 157 \ 3 scan0148 | |
| Letter from Dunlop Rubber Co. discussing post-war car tyre requirements and developments, specifically a past interest in 6.50-16 equipment. | 15th Jan 1944 | Box 157 \ 3 scan0149 | |
| Letter to The Dunlop Rubber Company Ltd. acknowledging correspondence about tyres. | 17th Jan 1944 | Box 157 \ 3 scan0150 | |
| Letter to Dunlop Rubber Co. Ltd. postponing a visit to discuss pre-war automobile development and 6.50-16 equipment. | 19th Jan 1944 | Box 157 \ 3 scan0151 | |
| Testing of Englebert Tyres and requesting tyre sizes from Mr. Muhlenkampf. | 23th May 1921 | Box 157 \ 4 scan0001 | |
| Potential trial of Englebert Tyres as a non-skid alternative to Dunlop tyres. | 21th May 1921 | Box 157 \ 4 scan0002 | |
| Price list for Englebert motor tyres showing sizes and costs for Square, Grooved, Chevron, Studded, and Tube types. | 23th May 1921 | Box 157 \ 4 scan0003 | |
| Letter to Englebert Tyres Ltd. requesting a sample set of tyres for experimental purposes. | 23th May 1921 | Box 157 \ 4 scan0004 | |
| Letter from Englebert Tyres Ltd. confirming an order for 895 x 150 tyres and advising of a temporary stock shortage. | 24th May 1921 | Box 157 \ 4 scan0005 | |
| Letter from Englebert Tyres Ltd. confirming the dispatch of new tyres and tubes for testing. | 31th May 1921 | Box 157 \ 4 scan0006 | |
| Negotiation for free or discounted test tyres from Englebert Tyre Co. | 4th Jun 1921 | Box 157 \ 4 scan0007 | |
| Letter from Englebert Tyres Ltd. regarding the dispatch of tyres for testing and invoicing. | 31th May 1921 | Box 157 \ 4 scan0008 | |
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