| Description | Date | Identifier | |
| Tyre tread print analysis for an 'India Super Nonskid' tyre, showing contact area and load data. | 23th Nov 1933 | Box 29 \ 4 Scan152 | |
| Tyre tread print with corresponding area and load calculations. | 23th Nov 1933 | Box 29 \ 4 Scan153 | |
| Tyre tread pattern print with specifications for a Goodyear H.D. tyre. | 22th Nov 1933 | Box 29 \ 4 Scan154 | |
| Comparison table of performance data for different 5.50/18 tyres under varying loads. | 22th Nov 1933 | Box 29 \ 4 Scan155 | |
| Letter from the India Tyre & Rubber Company comparing different tyre tread designs. | 23th Nov 1933 | Box 29 \ 4 Scan156 | |
| Letter from a tyre company discussing unusual wear patterns on tyres removed from a demonstration Bentley. | 23th Nov 1933 | Box 29 \ 4 Scan157 | |
| Letter from India Tyre & Rubber Co. Ltd. concerning a discrepancy of one tyre cover fitted to Bentley cars. | 24th Nov 1933 | Box 29 \ 4 Scan158 | |
| Letter from the Experimental Department to The Earl of Rothes regarding tyre wear and wet weather performance. | 27th Nov 1933 | Box 29 \ 4 Scan159 | |
| Letter from the Experimental Department to The India Tyre & Rubber Co Ltd regarding a tyre and a missing cover. | 27th Nov 1933 | Box 29 \ 4 Scan160 | |
| Letter from the India Tyre & Rubber Company regarding tyre testing and a planned visit. | 30th Nov 1933 | Box 29 \ 4 Scan161 | |
| Letter from the Experimental Department to the Earl of Rothes regarding seeing his new car. | 1st Dec 1933 | Box 29 \ 4 Scan162 | |
| Testing and paying for tyres from the India Tyre & Rubber Co. in France. | 1st Dec 1933 | Box 29 \ 4 Scan163 | |
| Letter from the Experimental Department to the Earl of Rothes regarding peculiar tyre wear. | 11th Dec 1933 | Box 29 \ 4 Scan164 | |
| Invoice from the India Tyre & Rubber Co. for tyres fitted to a Bentley Demonstration Car. | 11th Dec 1933 | Box 29 \ 4 Scan165 | |
| Letter from India Tyre & Rubber Company regarding an invoice for special covers fitted to a Bentley demonstration car. | 29th Nov 1933 | Box 29 \ 4 Scan166 | |
| Letter from India Tyre & Rubber Company concerning tyre performance and wear on a Bentley Demonstration Car. | 9th Dec 1933 | Box 29 \ 4 Scan167 | |
| The payment for four tyre covers for a Bentley demonstration car. | 12th Dec 1933 | Box 29 \ 4 Scan168 | |
| Letter from the India Tyre & Rubber Company regarding peculiar tyre wear on a Bentley's front axle. | 14th Dec 1933 | Box 29 \ 4 Scan169 | |
| Letter to the Earl of Rothes discussing a recent journey to Paris, icy road conditions, and tyre performance. | 19th Dec 1933 | Box 29 \ 4 Scan170 | |
| Letter from India Tyre & Rubber Company concerning peculiar treadwear on Bentley tyres. | 23th Jan 1934 | Box 29 \ 4 Scan171 | |
| Letter to The Earl of Rothes regarding worn tyres and a mileage of 5,000. | 24th Jan 1934 | Box 29 \ 4 Scan172 | |
| Instruction to send two India Tyres to Paul Worth at The India Tyre & Rubber Co. Ltd. | 24th Jan 1934 | Box 29 \ 4 Scan173 | |
| Letter from the India Tyre & Rubber Company concerning peculiar front axle tyre wear. | 26th Jan 1934 | Box 29 \ 4 Scan174 | |
| Telegram recommending Bentley tyre pressures of thirty-five front and thirty rear. | 22th Feb 1934 | Box 29 \ 4 Scan175 | |
| Letter regarding recommended tyre inflation pressures for a Bentley, including axle load calculations. | 24th Feb 1934 | Box 29 \ 4 Scan176 | |
| Letter from a tyre manufacturer regarding tyre pressure recommendations and load capacities. | 27th Feb 1934 | Box 29 \ 4 Scan177 | |
| Letter from India Tyre & Rubber Company Limited regarding tyre pressures for the Bentley. | 27th Feb 1934 | Box 29 \ 4 Scan178 | |
| Letter from India Tyre & Rubber Company to W.A. Rowbotham discussing a recent trip, a new job role, and arranging a meeting. | 21th Mar 1934 | Box 29 \ 4 Scan179 | |
| Letter to The India Tyre & Rubber Co. regarding the performance and investigation of U.S. Cord Tyres. | 7th Apr 1934 | Box 29 \ 4 Scan180 | |
| The second page of a typed letter arranging a potential meeting. | 7th Apr 1934 | Box 29 \ 4 Scan181 | |
| Letter from India Tyre & Rubber Company arranging a meeting to discuss tyre performance in America. | 9th Apr 1934 | Box 29 \ 4 Scan182 | |
| Letter to The Earl of Rothes at The India Tyre & Rubber Co. Ltd. to arrange a meeting. | 13th Apr 1934 | Box 29 \ 4 Scan183 | |
| Letter from India Tyre & Rubber Company discussing Bentley tyres, coachwork, door handles and steel body costs. | 18th Apr 1934 | Box 29 \ 4 Scan184 | |
| Page two of a letter to W.A. Robotham regarding a car delivery and viewing, with a postscript about new Daimler Straight 8's. | 18th Apr 1934 | Box 29 \ 4 Scan185 | |
| Letter discussing American steel body production methods and costs, mentioning Briggs Body Corp, Bentley, Cadillac, and Daimler. | 19th Apr 1934 | Box 29 \ 4 Scan186 | |
| Letter from India Tyre & Rubber Company confirming the decision to proceed with the manufacture of a sports tyre for Bentley. | 25th Apr 1934 | Box 29 \ 4 Scan187 | |
| Letter discussing the performance and mileage of India vs. Dunlop tyres on a 3½ Litre Bentley. | 8th May 1934 | Box 29 \ 4 Scan188 | |
| Letter detailing the superior performance of India tyres and tubes compared to Dunlops. | 9th May 1934 | Box 29 \ 4 Scan189 | |
| Letter to The India Tyre & Rubber Co. regarding the production and testing of a competition tyre, with a testimonial from a Bentley owner. | 9th May 1934 | Box 29 \ 4 Scan190 | |
| Letter from the India Tyre & Rubber Company regarding the manufacture of a 'Sports' tyre and a Bentley chassis order. | 10th May 1934 | Box 29 \ 4 Scan191 | |
| Letter to The Earl of Rothes at The India Tyre & Rubber Co. Ltd. regarding an invitation and a competition tyre. | 15th May 1934 | Box 29 \ 4 Scan192 | |
| Letter requesting advice and assistance with an overhaul for a 20 HP car. | 19th Jun 1934 | Box 29 \ 4 Scan193 | |
| Letter discussing the potential overhaul of a 20 HP car, including costs, scheduling, and specific work. | 20th Jun 1934 | Box 29 \ 4 Scan194 | |
| Letter regarding the upcoming test of Captain T.L. Dugdale's Bentley, B-181-BO. | 20th Jun 1934 | Box 29 \ 4 Scan195 | |
| Letter of thanks regarding an offer to help with the overhaul of a 20 HP car. | 21th Jun 1934 | Box 29 \ 4 Scan196 | |
| Letter from India Tyre & Rubber Company Ltd. concerning tyres on a 3½ litre Bentley. | 12th Jul 1934 | Box 29 \ 4 Scan197 | |
| Letter from a Bentley owner to The India Tyre & Rubber Co. Ltd. regarding correct tyre pressures after driving. | 22th Jun 1934 | Box 29 \ 4 Scan198 | |
| Copy of a letter from India Tyre & Rubber Company Limited to Bernard Hopps, acknowledging his letter. | 25th Jun 1934 | Box 29 \ 4 Scan199 | |
| Letter regarding tyre pressures and alternatives for a 3 1/2 litre Bentley. | 12th Jul 1934 | Box 29 \ 4 Scan200 | |
| Letter from the India Tyre & Rubber Company Limited to Bernard Hopps regarding tyre pressures. | 12th Jul 1934 | Box 29 \ 4 Scan201 | |
| Test results for 5.50/18 India Speed Special tyres under specific load and speed conditions. | 4th Jul 1934 | Box 29 \ 4 Scan202 | |
| Correspondence with The India Tyre & Rubber Co. Ltd. regarding tyre pressure performance and ordering tyres for testing. | 13th Jul 1934 | Box 29 \ 4 Scan203 | |
| Letter to The Earl of Rothes regarding a chassis trial and tyre inflation pressures. | 13th Jul 1934 | Box 29 \ 4 Scan204 | |
| Internal request to order a set of 6' tyres from the India Tyre Co. for direct delivery to G.W. Hancock at Chateauroux. | 14th Jul 1934 | Box 29 \ 4 Scan205 | |
| Bentley tyre pressures and enclosing measurements for specific tyre models. | 18th Jul 1934 | Box 29 \ 4 Scan206 | |
| Letter from India Tyre & Rubber Company providing measurements for the 6.00/18 Super Special Cover tyre. | 18th Jul 1934 | Box 29 \ 4 Scan207 | |
| Letter to India Tyre & Rubber Co. regarding the supply of new 'Colonial' type tyres for a Bentley test. | 25th Jul 1934 | Box 29 \ 4 Scan208 | |
| Cover letter to The Earl of Rothes enclosing a copy of a letter addressed to the India Tyre & Rubber Co.Ltd. | 26th Jul 1934 | Box 29 \ 4 Scan209 | |
| Letter from India Tyre & Rubber Company Ltd. regarding a delay in manufacturing a special colonial type tyre mould for a Bentley car. | 27th Jul 1934 | Box 29 \ 4 Scan210 | |
| Letter to The India Tyre & Rubber Co. Ltd. requesting a set of tyres for testing in Scotland. | 28th Jul 1934 | Box 29 \ 4 Scan211 | |
| Letter from India Tyre & Rubber Company Ltd. regarding the shipment of an experimental set of Colonial type tyres. | 30th Jul 1934 | Box 29 \ 4 Scan212 | |
| Letter to The India Tyre & Rubber Co. Ltd. regarding a potential factory visit and August holiday closures. | 31th Jul 1934 | Box 29 \ 4 Scan213 | |
| Letter from India Tyre & Rubber Company Ltd. concerning factory opening times and a potential visit. | 2nd Aug 1934 | Box 29 \ 4 Scan214 | |
| Letter to The Earl of Rothes regarding the receipt of Colonial Type Tread India Tyres. | 10th Aug 1934 | Box 29 \ 4 Scan215 | |
| Letter to the India Tyre & Rubber Co. Ltd. confirming the receipt of Colonial Type Tread tyres and their fitment to a car for testing. | 10th Aug 1934 | Box 29 \ 4 Scan216 | |
| Invoice for India Special Super N.S. tyre covers received for testing purposes. | 31th Aug 1934 | Box 29 \ 4 Scan217 | |
| Order to be placed for India Tyre Co. covers that have been received. | 4th Sep 1934 | Box 29 \ 4 Scan218 | |
| Letter from India Tyre & Rubber Company Ltd. regarding tyres, car performance, and servicing arrangements. | 7th Sep 1934 | Box 29 \ 4 Scan219 | |
| Letter to W.A. Robotham detailing a list of vehicle faults including a whistle, a squeaking bolt, a soldered pipe, and a slipping clutch. | 7th Sep 1934 | Box 29 \ 4 Scan220 | |
| Letter to The Earl of Rothes discussing motor racing, a car, and a fault with Colonial tyres. | 8th Sep 1934 | Box 29 \ 4 Scan221 | |
| Letter from India Tyre & Rubber Co. forwarding a request for a report on the wearing and nonskid properties of Colonial tyres for Bentley. | 12th Sep 1934 | Box 29 \ 4 Scan222 | |
| Letter to Lord Rothes of The India Tyre & Rubber Co. Ltd., regarding an enclosed letter. | 13th Sep 1934 | Box 29 \ 4 Scan223 | |
| Letter to The India Tyre & Rubber Co. Ltd. regarding the performance of their Colonial tyres. | 13th Sep 1934 | Box 29 \ 4 Scan224 | |
| Letter from India Tyre & Rubber Company regarding a noise issue with 'Colonial Tyres' and arranging a meeting. | 17th Sep 1934 | Box 29 \ 4 Scan225 | |
| Letter to a tyre supplier requesting new tyres for a test due to wear on the current set. | 19th Sep 1934 | Box 29 \ 4 Scan226 | |
| Letter from India Tyre & Rubber Co. forwarding a positive customer testimonial regarding car performance, handling and tyres. | 19th Sep 1934 | Box 29 \ 4 Scan227 | |
| Confidential note on the development of a revolutionary all-steel car body, replacing traditional wood construction. | 21th Sep 1934 | Box 29 \ 4 Scan228 | |
| List of requested repairs and observations for Lord Rothes' car. | 21th Sep 1934 | Box 29 \ 4 Scan229 | |
| Correspondence agreeing to work on chassis GXL-23 (Rothes' Car) and clarifying the final cost. | 24th Sep 1934 | Box 29 \ 4 Scan230 | |
| Letter from India Tyre & Rubber Company Ltd. arranging a visit to witness tests on the 'Colonial' tyre. | 28th Sep 1934 | Box 29 \ 4 Scan231 | |
| Letter to India Tyre & Rubber Co. Ltd. regarding noisy 'Colonial' type tyres and arranging a meeting to discuss the issue. | 1st Oct 1934 | Box 29 \ 4 Scan232 | |
| Letter to Lord Rothes regarding a car repair bill and a scheduled meeting in Derby. | 15th Oct 1934 | Box 29 \ 4 Scan233 | |
| Letter from a tyre supplier regarding Bentley chassis orders and tyre tests. | 4th Dec 1934 | Box 29 \ 4 Scan234 | |
| Letter to The Earl of Rothes regarding chassis B-150-DG, tyre testing, and vehicle modifications. | 5th Dec 1934 | Box 29 \ 4 Scan235 | |
| Letter from India Tyre & Rubber Company Ltd. comparing the specifications of a new tyre design against the present design. | 6th Dec 1934 | Box 29 \ 4 Scan236 | |
| Letter from India Tyre & Rubber Company Ltd. regarding the specifications of a new tyre. | 6th Dec 1934 | Box 29 \ 4 Scan237 | |
| Design drawing of a tire tread pattern with area calculations. | 25th Mar 1917 | Box 29 \ 4 Scan238 | |
| Design drawing of a tyre tread pattern with associated calculations. | 25th Mar 1917 | Box 29 \ 4 Scan239 | |
| Letter from India Tyre & Rubber Co. discussing tyre options for a Bentley intended for colonial use. | 6th Dec 1934 | Box 29 \ 4 Scan240 | |
| Page 2 of a letter to W.A. Robotham regarding an ongoing matter and a car update. | 6th Dec 1934 | Box 29 \ 4 Scan241 | |
| Letter to The Earl of Rothes of The India Tyre & Rubber Co. Ltd. concerning tyre sizes, wheel arch clearances, and vehicle height. | 7th Dec 1934 | Box 29 \ 4 Scan242 | |
| Letter to The India Tyre & Rubber Co. Ltd. regarding the delayed testing of special India Covers. | 10th Dec 1934 | Box 29 \ 4 Scan243 | |
| Letter from India Tyre & Rubber Company Ltd. concerning a meeting and tyre radius measurements. | 10th Dec 1934 | Box 29 \ 4 Scan244 | |
| Letter from the Experimental Department confirming a meeting with The Earl of Rothes. | 12th Dec 1934 | Box 29 \ 4 Scan245 | |
| Letter from India Tyre & Rubber Company Ltd. concerning tyre dimensions and specifications. | 12th Dec 1934 | Box 29 \ 4 Scan246 | |
| Page 2 of a letter from India Tyre & Rubber Company Limited to W. A. Robotham. | 12th Dec 1934 | Box 29 \ 4 Scan247 | |
| Table detailing the dimensions and weights of various tyres at recommended pressure. | 12th Dec 1934 | Box 29 \ 4 Scan248 | |
| Invoice from India Tyre & Rubber Co. for covers and tubes sent to a customer in France. | 11th Dec 1934 | Box 29 \ 4 Scan249 | |
| Request to send an order for 15 sets of India Tyre & Rubber Co. Special 'B' Design Covers and Tubes. | 13th Dec 1934 | Box 29 \ 4 Scan250 | |
| Letter to The India Tyre & Rubber Co. Ltd. regarding information on larger size tyres. | 13th Dec 1934 | Box 29 \ 4 Scan251 | |
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