| Description | Date | Identifier | |
| Confirming the despatch of a Phantom III Fan blade set to Messrs. Ferodo Ltd. for the attention of Mr. Longley. | 18th Mar 1939 | Box 135 \ 4 scan0008 | |
| Letter from Ferodo Limited regarding the return and testing of two fans and a belt. | 28th Mar 1939 | Box 135 \ 4 scan0009 | |
| Requesting the despatch of two Ph.III fans to Ferodo Ltd. for destructive testing. | 3rd Apr 1939 | Box 135 \ 4 scan0010 | |
| Letter to Ferodo Ltd. regarding the failure of a fan due to incorrect blade material and the dispatch of replacements. | 3rd Apr 1939 | Box 135 \ 4 scan0011 | |
| Crack test on a fan spider component. | 13th Apr 1939 | Box 135 \ 4 scan0012 | |
| Letter to Ferodo Ltd. about altering a belt's length and requesting their nearest standard size. | 28th Apr 1939 | Box 135 \ 4 scan0013 | |
| Letter from Ferodo Limited discussing the nearest available Ferogrip belt moulds for part number EB.4844 following a design change. | 29th Apr 1939 | Box 135 \ 4 scan0014 | |
| Letter to Ferodo Ltd. regarding an order for mould V. iii standard belt sizes. | 1st May 1939 | Box 135 \ 4 scan0015 | |
| Letter from Ferodo Limited regarding the collapse of a Duralumin-bladed fan during testing. | 8th May 1939 | Box 135 \ 4 scan0016 | |
| Letter from Ferodo Limited regarding the return of a collapsed Duralumin bladed fan. | 10th May 1939 | Box 135 \ 4 scan0017 | |
| Request to replace a fractured fan blade for a Ferodo test rig. | 12th May 1939 | Box 135 \ 4 scan0018 | |
| Letter to Ferodo Ltd. regarding the repair of a fractured fan and a test on variable speed fan pulleys. | 12th May 1939 | Box 135 \ 4 scan0019 | |
| Letter to Ferodo Ltd. about an issue with V.111 belts being too long and proposing an exchange for V.155 belts. | 15th May 1939 | Box 135 \ 4 scan0020 | |
| Letter from Ferodo Limited regarding a repaired fan and an adjustable diameter pulley. | 15th May 1939 | Box 135 \ 4 scan0021 | |
| Letter from Ferodo Limited arranging the exchange of incorrectly sized Ferogrip belts. | 16th May 1939 | Box 135 \ 4 scan0022 | |
| Letter to Ferodo Ltd. regarding fans, adjustable diameter pulleys and the use of their fan rig for testing. | 17th May 1939 | Box 135 \ 4 scan0023 | |
| Letter to Ferodo Ltd. regarding the return of 3 belts and a request for replacements. | 18th May 1939 | Box 135 \ 4 scan0024 | |
| Internal request to order six B.80 fan belts from Ferodo Ltd. | 20th May 1939 | Box 135 \ 4 scan0025 | |
| Letter from Ferodo Limited concerning belt angles, friction coefficients, and test results for expanding and contracting pulleys. | 22th May 1939 | Box 135 \ 4 scan0026 | |
| Specifications for belt and pulley angles on B.60 and B.80 engines. | 25th May 1939 | Box 135 \ 4 scan0027 | |
| Requesting the production of two sets of dynamo pulleys with specific dimensions and material requirements. | 25th May 1939 | Box 135 \ 4 scan0028 | |
| Letter from Ferodo Limited regarding the supply of belts and an attached credit note for returned items. | 5th Jun 1939 | Box 135 \ 4 scan0029 | |
| Proposal for a variable pitch fan pulley system to address excessive fan noise. | 6th Jun 1939 | Box 135 \ 4 scan0030 | |
| Requesting an official order for an experimental B.80 belt from Ferodo Ltd. | 24th Jun 1939 | Box 135 \ 4 scan0031 | |
| Letter from Ferodo Limited regarding various fan belt specifications in response to a request. | 26th Jun 1939 | Box 135 \ 4 scan0032 | |
| Letter from Ferodo Limited regarding the examination and testing of three fan belts. | 4th Jul 1939 | Box 135 \ 4 scan0033 | |
| Letter to Messrs. Ferodo Ltd. regarding the despatch of a dynamo and pulley for testing Ferogrip belts. | 20th Jul 1939 | Box 135 \ 4 scan0034 | |
| Letter from Ferodo Limited regarding the dispatch of a dynamo and belts for drawing E.56204. | 21th Jul 1939 | Box 135 \ 4 scan0035 | |
| Requesting the manufacture of a set of cast iron pulleys for testing the effects of out of balance forces. | 22th Aug 1939 | Box 135 \ 4 scan0036 | |
| Letter to Ferodo Ltd. regarding B.155 belts being too short and enquiring about progress on a dynamo and pulley rig. | 22th Aug 1939 | Box 135 \ 4 scan0037 | |
| Requesting a design for a sample blade for a variable pitch fan to investigate manufacturing possibilities. | 22th Aug 1939 | Box 135 \ 4 scan0038 | |
| Requesting the manufacture of a modified B.80 fan with a zero blade angle at the tip. | 22th Aug 1939 | Box 135 \ 4 scan0039 | |
| Correct size for Ferogrip Fan Belts on a 25 HP chassis. | 22th Aug 1939 | Box 135 \ 4 scan0040 | |
| Letter from Ferodo Ltd discussing fan belt suitability and test results for a triangulated drive. | 23th Aug 1939 | Box 135 \ 4 scan0041 | |
| Letter to Ferodo Ltd. regarding the testing of a V.114 belt and postponing a visit due to the international situation. | 25th Aug 1939 | Box 135 \ 4 scan0042 | |
| Letter from supplier Ferodo Ltd concerning fan belt slip and a fractured fan. | 31th Aug 1939 | Box 135 \ 4 scan0043 | |
| Two photographic views of a belt-driven fan and dynamo test rig assembly. | 15th Dec 1939 | Box 135 \ 4 scan0044 | |
| Two work features: fan noise and improvement in 8-cylinder engine mounting. | 15th Dec 1939 | Box 135 \ 4 scan0045 | |
| Letter to Ferodo Ltd. regarding the resumption of collaborative experimental work on a triangular belt during the war. | 19th Jan 1940 | Box 135 \ 4 scan0046 | |
| Letter to Messrs. Ferodo Ltd. arranging a visit for Mr. Shilton to see Mr. Edwards. | 25th Jan 1940 | Box 135 \ 4 scan0047 | |
| Suggesting a study of American fan construction methods to reduce costs. | 25th Feb 1940 | Box 135 \ 4 scan0048 | |
| Design challenges and potential improvements for rubber-mounted fan blades. | 6th Mar 1940 | Box 135 \ 4 scan0049 | |
| Discussions from a visit by Ferodo Ltd. regarding belts, test rigs and pulleys. | 9th Mar 1940 | Box 135 \ 4 scan0050 | |
| Plan to test new crankshaft and fan pulleys and belts, noting potential overheating issues. | 9th Mar 1940 | Box 135 \ 4 scan0051 | |
| Postponing the design of a variable pitch fan due to other important commitments. | 14th Mar 1940 | Box 135 \ 4 scan0052 | |
| The design and manufacturing process for rubber-mounted fan blades. | 14th Mar 1940 | Box 135 \ 4 scan0053 | |
| Continued discussion on fan design, suggestions for stability, and analysis of test failures. | 14th Mar 1940 | Box 135 \ 4 scan0054 | |
| Alteration notice adding the overall pulley width and keyway width for a pulley and fan dynamo. | 28th Mar 1940 | Box 135 \ 4 scan0055 | |
| Sending various types of pulleys to Ferodo Ltd. for wear and squeak testing. | 29th May 1940 | Box 135 \ 4 scan0056 | |
| Squeaking belt drives and the relative merits of pressed steel versus cast iron pulleys. | 29th Mar 1940 | Box 135 \ 4 scan0057 | |
| The feasibility of machining grooves in pressed steel pulleys and expressing skepticism about the process. | 29th Mar 1940 | Box 135 \ 4 scan0058 | |
| Letter from Ferodo Ltd concerning the re-establishment of fan belt and pulley tests. | 29th Mar 1940 | Box 135 \ 4 scan0059 | |
| Letter to Ferodo Ltd. regarding the specifications and supply of pulleys. | 3rd Apr 1940 | Box 135 \ 4 scan0060 | |
| Page two of a letter discussing the readiness of a rig and a visit to see the commencement of tests. | 3rd Apr 1940 | Box 135 \ 4 scan0061 | |
| Letter from Ferodo Ltd regarding V. Belt tests. | 4th Apr 1940 | Box 135 \ 4 scan0062 | |
| Brief internal memorandum acknowledging a previous communication and expressing interest in test results. | 10th Apr 1940 | Box 135 \ 4 scan0063 | |
| Fan belt clearance issues for the Silver Phantom, Cresta, and Comet chassis. | 17th Apr 1940 | Box 135 \ 4 scan0064 | |
| The 'Ripple Fan', indicating the project is on hold pending the arrival of a Studebaker Fan model. | 18th Apr 1940 | Box 135 \ 4 scan0065 | |
| Prints for Fan and Crankshaft pulleys, and a request for costs to produce them as pressings. | 18th Apr 1940 | Box 135 \ 4 scan0066 | |
| Letter to Ferodo Ltd. regarding pulley wear, belt noise, and the potential use of sheet Bakelite for pulleys. | 18th Apr 1940 | Box 135 \ 4 scan0067 | |
| Letter discussing the difficulty of changing a belt on an experimental car. | 4th Apr 1940 | Box 135 \ 4 scan0068 | |
| Letter from Ferodo Ltd discussing the testing and performance of fabric pulleys for a belt drive. | 29th Apr 1940 | Box 135 \ 4 scan0069 | |
| Letter from Ferodo Ltd. regarding advised angles for belts on various pulley diameters. | 3rd May 1940 | Box 135 \ 4 scan0070 | |
| Letter to Ferodo Ltd. regarding tests on Bakelite and fabric pulleys and potential alternatives. | 3rd May 1940 | Box 135 \ 4 scan0071 | |
| Letter confirming the resolution of a belt squeak issue by fitting a new belt. | 3rd May 1940 | Box 135 \ 4 scan0072 | |
| Confirming the swap of water pumps and fans between cars 9.B.V. and 3.B.50. | 15th May 1940 | Box 135 \ 4 scan0073 | |
| Letter from Ferodo Ltd discussing the manufacture of three fabric pulleys for testing purposes. | 4th May 1940 | Box 135 \ 4 scan0074 | |
| Letter to Ferodo's Ltd. concerning a delay in supplying pressed steel pulleys, attributing the cause to Mr. Hitler. | 6th May 1940 | Box 135 \ 4 scan0075 | |
| Secret memo discussing fan belt clearance issues and proposed modifications for 8 Cylinder Senior Range cars. | 20th May 1940 | Box 135 \ 4 scan0076 | |
| Letter from FERODO LTD concerning tests on modified three-point fan drives and moulded fabric pulleys. | 15th Aug 1940 | Box 135 \ 4 scan0077 | |
| Letter to P. Atkins Co. Ltd. requesting the urgent supply of half-gallon cans for compressor oil for a priority Admiralty job. | 29th Oct 1940 | Box 135 \ 4 scan0078 | |
| Query regarding the fan drive ratio compared to a Buick, with the goal of reducing fan noise. | 29th Oct 1940 | Box 135 \ 4 scan0079 | |
| Fan drive ratios, with a comparative list of ratios from various car manufacturers. | 31th Oct 1940 | Box 135 \ 4 scan0080 | |
| Measurement and analysis of Ferogrip belt angles when bent to the radii of pulleys. | 13th Jun 1941 | Box 135 \ 4 scan0081 | |
| Letter requesting recommendations for two fan drive belt applications for vehicles. | 29th Jul 1941 | Box 135 \ 4 scan0082 | |
| Urgent request to the Alum Foundry for three aluminium castings of a modified fan. | 7th Aug 1941 | Box 135 \ 4 scan0083 | |
| Potential trial of a 'Proteca motor' air filter, weighing its effectiveness against potential induction restriction. | 18th Nov 1924 | Box 135 \ 4 scan0084 | |
| The 'Protectomotor' device, summarizing a test and proposing further evaluation. | 13th Nov 1924 | Box 135 \ 4 scan0085 | |
| Impracticality of fitting a 'Protectomotor' cleaning device to the existing carburetter design. | 20th Nov 1924 | Box 135 \ 4 scan0086 | |
| Forwarding a copy of a letter concerning a United Air Cleaner. | 17th Dec 1924 | Box 135 \ 4 scan0087 | |
| Letter discussing the forwarding of a United Air Cleaner for testing and potential application. | 9th Dec 1924 | Box 135 \ 4 scan0088 | |
| Limited need for air cleaners in England. | 13th Oct 1925 | Box 135 \ 4 scan0089 | |
| Booklet on the 'how' and 'why' of air cleaning for automobiles by O. V. Greene. | 8th Feb 1926 | Box 135 \ 4 scan0090 | |
| Informational booklet and price list for Air-Maze automobile air cleaners. | 8th Feb 1926 | Box 135 \ 4 scan0091 | |
| The principles, types, and benefits of engine air cleaners, including fitting instructions for a specific model. | 8th Feb 1926 | Box 135 \ 4 scan0092 | |
| Promotional and informational leaflet from the Air-Maze Corporation about their automotive air filters. | 8th Feb 1926 | Box 135 \ 4 scan0093 | |
| Informational document comparing the efficiency and benefits of the Air-Maze air filter against whirler-type air cleaners. | 8th Feb 1926 | Box 135 \ 4 scan0094 | |
| Explaining the features and advantages of the Air-Maze filter compared to other types. | 8th Feb 1926 | Box 135 \ 4 scan0095 | |
| Explanation of the 'baffling impingement' principle and the construction and function of an Air-Maze filter. | 19th Oct 1925 | Box 135 \ 4 scan0096 | |
| Missing print related to air cleaners. | 19th Oct 1925 | Box 135 \ 4 scan0097 | |
| Letter arguing for the necessity of fitting air cleaners to cars due to engine wear from dirt roads. | 7th Oct 1925 | Box 135 \ 4 scan0098 | |
| Letter proposing modifications to the 'New Phantom' carburetter, silencer, and air cleaner. | 7th Oct 1925 | Box 135 \ 4 scan0099 | |
| Cover letter regarding an enclosed print concerning Air Cleaners. | 24th Oct 1925 | Box 135 \ 4 scan0100 | |
| Follow-up letter to Mr. Claude Johnson enclosing a previously omitted attachment regarding Air Cleaners. | 15th Oct 1925 | Box 135 \ 4 scan0101 | |
| Letter from R. A. Rothermel, Ltd. proposing the supply of United Air Cleaners for motor cars. | 20th Feb 1925 | Box 135 \ 4 scan0102 | |
| Promotional leaflet with price lists for 'The United Air Cleaner' for a wide range of automobiles and trucks. | 20th Feb 1925 | Box 135 \ 4 scan0103 | |
| Advertisement leaflet for The United Air Cleaner, explaining the dangers of dust to a motor and the benefits of the product. | 8th Oct 1926 | Box 135 \ 4 scan0104 | |
| Cover note for a test report on a cylinder and head, enclosing a copy received from America. | 8th Oct 1926 | Box 135 \ 4 scan0105 | |
| Test report discussing the effectiveness of an air cleaner in preventing a sticking air valve on a cylinder and head. | 27th Sep 1926 | Box 135 \ 4 scan0106 | |
| Air Cleaners and Oil Filters handled by the A.C. Sphinx Company. | 26th Aug 1927 | Box 135 \ 4 scan0107 | |
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