| Description | Date | Identifier | |
| Letter to Messrs. W. H. Colt regarding the delivery and performance of a modified 40/50 model car fan. | 19th Mar 1932 | Box 135 \ 1 scan0022 | |
| Letter to W.H. Colt Ltd. concerning a failed modified fan and requesting the return of a 20/25 HP car fan. | 22th Mar 1932 | Box 135 \ 1 scan0023 | |
| Letter from W. H. Colt, Ltd. discussing tests and modifications for a 40/50 model car fan, specifically concerning blade flexing. | 22th Mar 1932 | Box 135 \ 1 scan0024 | |
| Letter from Colt Ventilation Limited regarding preliminary tests and an attached blueprint for a fan blade apparatus. | 22th Mar 1932 | Box 135 \ 1 scan0025 | |
| Design drawing of three different blade profiles with their corresponding airfoil cross-sections. | 23th Mar 1932 | Box 135 \ 1 scan0026 | |
| Letter from W. H. Colt, Ltd. discussing the cause of a fan breakage, proposing repairs and high-speed testing. | 23th Mar 1932 | Box 135 \ 1 scan0027 | |
| Letter to W.H. Colt Ltd. regarding a fan failure, its repair, and speed limits. | 24th Mar 1932 | Box 135 \ 1 scan0028 | |
| Letter from W. H. COLT, LTD. regarding a repaired fan and a broken casting. | 22th Apr 1932 | Box 135 \ 1 scan0029 | |
| Letter to Messrs. W.H. Colt Ltd. acknowledging receipt of a repaired fan with self-adjusting blades. | 25th Apr 1932 | Box 135 \ 1 scan0030 | |
| Comparing different engine fans for the 3 1/2 Litre Bentley to address overheating when idling. | 14th Sep 1935 | Box 135 \ 1 scan0031 | |
| Graph charting the results of fan tests on a 3½ Litre Bentley, measuring water temperature rise over time at different engine speeds. | 9th Sep 1933 | Box 135 \ 1 scan0032 | |
| Comparison graph of power absorbed by various cooling fans. | 18th Sep 1933 | Box 135 \ 1 scan0033 | |
| Tests to determine the power absorbed by three different types of cooling fans on a Bentley unit. | 16th Sep 1933 | Box 135 \ 1 scan0034 | |
| Request to reproduce the metal portions of a variable-pitch American fan blade for bonding with rubber. | 18th May 1934 | Box 135 \ 1 scan0035 | |
| Letter from British Goodrich Rubber Co. Ltd. regarding drawings for an Engine Support Insulator and a query about American type Fan Blades. | 23th May 1934 | Box 135 \ 1 scan0036 | |
| Letter to The British Goodrich Rubber Co. Ltd. regarding metal fan parts for a rubber bonding process. | 28th May 1934 | Box 135 \ 1 scan0037 | |
| Request for information on a cooling fan for the Alvis Crested Eagle series, as seen in 'Autocar' magazine. | 14th Jun 1935 | Box 135 \ 1 scan0038 | |
| Order for one Trico Vacuum Fan. | 31th Oct 1935 | Box 135 \ 1 scan0039 | |
| Proposal from J. & A. Hillman Ltd to test their patented fan belts, brake linings, and flexible couplings. | 20th Aug 1936 | Box 135 \ 1 scan0040 | |
| Letter to J. & A. Hillman Ltd. requesting samples and quotations for special construction fan belts for testing. | 24th Aug 1936 | Box 135 \ 1 scan0041 | |
| Letter to The British Tyre & Rubber Co. Ltd. regarding the testing of belts which have stretched and a request for shorter replacements. | 29th Oct 1936 | Box 135 \ 1 scan0042 | |
| Letter requesting details and running experience of a Patent Fan from Mr. Thos. T. Chilton. | 10th Nov 1936 | Box 135 \ 1 scan0043 | |
| Letter from an inventor, Thomas T. Chilton, offering a patented fan design to control engine temperature. | 4th Nov 1936 | Box 135 \ 1 scan0044 | |
| Letter discussing a fan pulley drawing, its adaptation for a clutch, and subsequent test results. | 14th Nov 1936 | Box 135 \ 1 scan0045 | |
| Letter from Thomas T. Edition describing a design for a clutch-controlled fan and pulley system. | 27th Nov 1936 | Box 135 \ 1 scan0046 | |
| Investigation into a suggested composite fan pulley for the Phantom III to achieve cost savings. | 27th Nov 1936 | Box 135 \ 1 scan0047 | |
| Letter from the Experimental Department rejecting a submitted fan drive design. | 11th Dec 1936 | Box 135 \ 1 scan0048 | |
| Letter to the British Tyre & Rubber Co. Ltd. regarding fan belt testing and requesting a quotation for water connections. | 17th Dec 1936 | Box 135 \ 1 scan0049 | |
| Cost reduction for cylinder liner joint rings and inquiring about alternative materials and specifications. | 17th Dec 1936 | Box 135 \ 1 scan0050 | |
| The final page of a letter, marked as page 3, with the closing remarks. | 17th Dec 1936 | Box 135 \ 1 scan0051 | |
| Summary of running tests performed on twin belts (Mould No.293) with corrected pulley angles. | 6th Nov 1936 | Box 135 \ 1 scan0052 | |
| The receipt of 'V' type fan belts from The British Tyre & Rubber Co. | 6th Nov 1936 | Box 135 \ 1 scan0053 | |
| Request to send an official order for a fan belt to British Goodrich Co. which has already been received. | 4th Jan 1937 | Box 135 \ 1 scan0054 | |
| Economy scheme for the fan on the 25/30 HP & Bentley Chassis. | 1st Feb 1937 | Box 135 \ 1 scan0055 | |
| Request to send an official order for two fan belts already received from British Goodrich. | 12th Feb 1937 | Box 135 \ 1 scan0056 | |
| Request for a covering order for four fan belts to be sent to British Goodrich Tyre & Rubber Co. Ltd. | 6th May 1937 | Box 135 \ 1 scan0057 | |
| Letter to The British Tyre & Rubber Co. placing an order for four fan belts. | 6th May 1937 | Box 135 \ 1 scan0058 | |
| Letter from British Tyre & Rubber Co. Ltd. confirming the urgent despatch of four belts prior to receiving the official order. | 7th May 1937 | Box 135 \ 1 scan0059 | |
| Return of four mistakenly sent fan belts to The British Goodrich Tyre & Rubber Co. | 10th May 1937 | Box 135 \ 1 scan0060 | |
| Ordering the correct fan belts and returning a previous incorrect order. | 10th May 1937 | Box 135 \ 1 scan0061 | |
| Request to send a covering order to Messrs British Goodrich Ltd. for two fan belts. | 27th May 1937 | Box 135 \ 1 scan0062 | |
| Letter from a rubber manufacturer detailing the advantages of their patented fan belts. | 3rd Jun 1937 | Box 135 \ 1 scan0063 | |
| Page 2 of a letter from J. & A. Hillman Ltd. regarding a finished section. | 3rd Jun 1937 | Box 135 \ 1 scan0064 | |
| Following up on a request to test a new fan belt from Thos. Whittle & Sons Ltd., with the sample being sent herewith. | 4th May 1937 | Box 135 \ 1 scan0065 | |
| Letter from British Tyre & Rubber Co. Ltd. confirming the cost and delivery time for a V-belt mould. | 5th Jun 1937 | Box 135 \ 1 scan0066 | |
| Letter to a rubber manufacturer requesting fan belts for experimental testing purposes. | 15th Jun 1937 | Box 135 \ 1 scan0067 | |
| Letter from a rubber manufacturer acknowledging a query about patented fan belts. | 16th Jun 1937 | Box 135 \ 1 scan0068 | |
| Urgent order for 20 black fan belts from British Goodrich. | 18th Jun 1937 | Box 135 \ 1 scan0069 | |
| Letter from a rubber manufacturer regarding the suitability and supply of sample fan belts for testing. | 22th Jun 1937 | Box 135 \ 1 scan0070 | |
| Letter from a rubber manufacturer inquiring about the satisfaction of a sample fan belt. | 8th Jul 1937 | Box 135 \ 1 scan0071 | |
| Responding to an enquiry about an order for 12 fans. | 10th Jul 1937 | Box 135 \ 1 scan0072 | |
| Official order for three fan belts from British Goodrich Ltd. | 12th Jul 1937 | Box 135 \ 1 scan0073 | |
| Requesting the fitting of a fan pulley and driving pulley to a rig engine. | 7th Oct 1937 | Box 135 \ 1 scan0074 | |
| Letter from British Tyre & Rubber Co. Ltd. regarding a recommendation for Fan Belts for the Phantom III car. | 11th Sep 1936 | Box 135 \ 1 scan0075 | |
| Letter to Ferodo Ltd. expressing interest in discussing their entry into the fan belt industry. | 16th Oct 1937 | Box 135 \ 1 scan0076 | |
| Letter from Ferodo Limited regarding a project on fan belts and a proposed meeting. | 18th Oct 1937 | Box 135 \ 1 scan0077 | |
| Request to place an official order with Messrs. British Goodrich for two fan belts for mould No. 336. | 28th Oct 1937 | Box 135 \ 1 scan0078 | |
| Letter to Messrs. Ferodo Ltd. regarding the discussion of fan belt manufacture. | 29th Oct 1937 | Box 135 \ 1 scan0079 | |
| Letter from Ferodo Limited regarding the supply of fan-belts for testing ahead of full production. | 30th Oct 1937 | Box 135 \ 1 scan0080 | |
| Letter to Vauxhall Motors requesting information on fan belt suppliers and specifications. | 2nd Nov 1937 | Box 135 \ 1 scan0081 | |
| Letter to Ferodo Ltd. regarding the durability of experimental fan belts and arranging a visit to their works. | 2nd Nov 1937 | Box 135 \ 1 scan0082 | |
| Letter to Ferodo Ltd. requesting the manufacture of three fan belts for testing purposes. | 10th Nov 1937 | Box 135 \ 1 scan0083 | |
| Specification sheet for experimental belts, detailing their required dimensions. | 10th Nov 1937 | Box 135 \ 1 scan0084 | |
| The despatch of one fan belt to Messrs. Ferodo Ltd. | 10th Nov 1937 | Box 135 \ 1 scan0085 | |
| Official order to be placed with Messrs. Ferodo Ltd. for three experimental fan belts. | 10th Nov 1937 | Box 135 \ 1 scan0086 | |
| Letter from Ferodo Limited regarding a sample fan belt and its dimension details. | 12th Nov 1937 | Box 135 \ 1 scan0087 | |
| Letter from B.F. Goodrich to General Motors detailing belt measurements and supply constraints for drawings EB-221 and EXS-194. | 23th Nov 1937 | Box 135 \ 1 scan0088 | |
| Letter from B. F. Goodrich Company detailing the approximate dimensions of a belt and requesting a payment of $1.00. | 14th Dec 1937 | Box 135 \ 1 scan0089 | |
| Letter from Harrison Radiator Division requesting various rubber companies to send belts to Derby, England. | 16th Nov 1937 | Box 135 \ 1 scan0090 | |
| Letter concerning an update to the fan belt supplier list and a query about belt color. | 26th Nov 1937 | Box 135 \ 1 scan0091 | |
| Letter from Ferodo Limited regarding a delay and pricing for the manufacture of new fan belts for order number 51929. | 4th Dec 1937 | Box 135 \ 1 scan0092 | |
| Instruction memo for new tracings and L.O.P. for the Wraith III Chassis fan section, cancelling a previous instruction. | 8th Dec 1937 | Box 135 \ 1 scan0093 | |
| Order be placed for three fan belts from The B.F. Goodrich Co. | 9th Dec 1937 | Box 135 \ 1 scan0094 | |
| Letter from The Gates Rubber Company regarding fan belt specifications and their proprietary concave sidewall design. | 9th Dec 1937 | Box 135 \ 1 scan0095 | |
| Page two of a letter regarding the design and testing of a special belt for cars. | 9th Dec 1937 | Box 135 \ 1 scan0096 | |
| Bulletin explaining the correct procedure for measuring fan belt sheave angles using 'Angle Cards'. | 9th Dec 1937 | Box 135 \ 1 scan0097 | |
| Instructions on how to measure and specify a replacement V-belt for a pulley system. | 9th Dec 1937 | Box 135 \ 1 scan0098 | |
| Warning and procedure for ordering the correct replacement belt using 'Angle Cards'. | 9th Dec 1937 | Box 135 \ 1 scan0099 | |
| Letter to the Harrison Radiator Corporation regarding the supply and specification of belts. | 9th Dec 1937 | Box 135 \ 1 scan0100 | |
| Letter to B.F. Goodrich Co. confirming receipt of three suitable belts and requesting three more based on a specific drawing and mould number. | 9th Dec 1937 | Box 135 \ 1 scan0101 | |
| Order for specific Hoffmann ball races for experimental use. | 9th Dec 1937 | Box 135 \ 1 scan0102 | |
| Letter to Ferodo Ltd. discussing the initial test results and a sizing issue with three sample fan belts. | 21th Dec 1937 | Box 135 \ 1 scan0103 | |
| Report to Messrs. Ferodo Ltd. on the testing and peculiar behaviour of fan belts. | 21th Dec 1937 | Box 135 \ 1 scan0104 | |
| Letter to Ferodo Ltd. requesting the supply of specific belts and inquiring about production timelines for fan belts. | 21th Dec 1937 | Box 135 \ 1 scan0105 | |
| The return of a fan belt to Messrs. Ferodo Ltd. for examination. | 23th Dec 1937 | Box 135 \ 1 scan0106 | |
| Letter from Ferodo Limited discussing the preliminary test results of three sample fan belts and future production. | 23th Dec 1937 | Box 135 \ 1 scan0107 | |
| Letter from Ferodo Limited regarding the examination of a damaged V belt. | 29th Dec 1937 | Box 135 \ 1 scan0108 | |
| The procurement of fan belts from four different American rubber companies. | 6th Jan 1938 | Box 135 \ 1 scan0109 | |
| Follow-up letter from The Gates Rubber Company regarding a request for fan belts. | 27th Jan 1938 | Box 135 \ 1 scan0110 | |
| Page 2 of a letter from the Export Division offering fan belts and associated design services. | 29th Jan 1938 | Box 135 \ 1 scan0111 | |
| Letter from Ferodo Limited discussing the dispatch of Ferogrip fan belts and their standard color. | 29th Jan 1938 | Box 135 \ 1 scan0112 | |
| Official order for lacing strip from Messrs. Ferodo Ltd. | 1st Feb 1938 | Box 135 \ 1 scan0113 | |
| Letter to Ferodo Ltd. regarding the supply and testing of fan belts and strip material. | 1st Feb 1938 | Box 135 \ 1 scan0114 | |
| Letter from John Marston Ltd regarding the forwarding of a 12 Volt Motor for testing. | 2nd Feb 1938 | Box 135 \ 1 scan0115 | |
| Copy of a letter from The British Thermostat Co. Ltd to John Marston Ltd regarding a 12-volt plain bearing motor. | 28th Jan 1938 | Box 135 \ 1 scan0116 | |
| Letter from Goodyear Tire & Rubber Export Company regarding an order for Fan Belts. | 1st Feb 1938 | Box 135 \ 1 scan0117 | |
| Sending sectioned parts of two fan belts for examination. | 4th Feb 1938 | Box 135 \ 1 scan0118 | |
| Letter to Ferodo Ltd. detailing the failure of 'Fero-grip' fan belts during endurance testing. | 4th Feb 1938 | Box 135 \ 1 scan0119 | |
| Letter to Ferodo Ltd. detailing the results of fan belt testing, including comparisons with American belts and proposed pulley modifications. | 4th Feb 1933 | Box 135 \ 1 scan0120 | |
| Letter discussing the potential order of 600 belts. | 4th Feb 1938 | Box 135 \ 1 scan0121 | |
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