| Description | Date | Identifier | |
| Inquiry regarding the performance and further testing of Merlin thin shell bearings produced by Vandervell's Ltd. | 20th Nov 1940 | Box 115 \ 4 scan0107 | |
| The development and testing of Vandervell main bearings, comparing them to standard silver alloy and lead-bronze types. | 14th Oct 1940 | Box 115 \ 4 scan0108 | |
| The performance of flangeless blade rod bearings and camshaft bushes. | 14th Oct 1940 | Box 115 \ 4 scan0109 | |
| The running experience and tests of Vandervell bearings on Merlin engines. | 14th Oct 1940 | Box 115 \ 4 scan0110 | |
| Analysis of bearing and camshaft bush performance and condition following engine testing. | 10th Sep 1940 | Box 115 \ 4 scan0111 | |
| The development and mechanical testing of Vandervell thin shell tri-metal main bearings. | 10th Sep 1940 | Box 115 \ 4 scan0112 | |
| Description of a test rig, test procedures, and results of tests on Vandervell bearings. | 10th Sep 1940 | Box 115 \ 4 scan0113 | |
| Bearing tests, comparing white-metal and Vandervell bearings to standard RR alloy bearings for the Merlin engine. | 10th Sep 1940 | Box 115 \ 4 scan0114 | |
| Report page detailing further tests and conclusions on Vandervell bearings, comparing tri-metal and lead-bronze types. | 10th Sep 1940 | Box 115 \ 4 scan0115 | |
| Comparison of a Vandervell tri-metal bearing with lead bronze and standard R.R. bearings. | 10th Sep 1940 | Box 115 \ 4 scan0116 | |
| Test report on the fatigue series of Vandervell bearings. | 10th Sep 1940 | Box 115 \ 4 scan0117 | |
| Log of bearing composition tests detailing performance, temperature, and failure modes. | 10th Sep 1940 | Box 115 \ 4 scan0118 | |
| Test report on Vandervell bearings, detailing performance and failure analysis under various conditions. | 4th Dec 1940 | Box 115 \ 4 scan0119 | |
| Letter to The Hoffmann Manufacturing Co., Ltd. requesting 24 No. 117.FS bearings. | 4th Dec 1940 | Box 115 \ 4 scan0120 | |
| Letter to Vandervell Products Ltd. discussing a choice between tri-metal and lead bronze bearings. | 30th Nov 1940 | Box 115 \ 4 scan0121 | |
| Letter to Vandervell Products Ltd. regarding revised prints for engine bearings and washers. | 26th Mar 1941 | Box 115 \ 4 scan0122 | |
| Request to issue an official order to Hoffmann Manufacturing Co. to cover bearings. | 22th May 1941 | Box 115 \ 4 scan0123 | |
| Copy of a letter to The Hoffmann Manufacturing Co. urgently requesting a list of ball and roller bearings for an experimental project. | 3rd Mar 1941 | Box 115 \ 4 scan0124 | |
| Letter to Wellworthy Piston Rings Ltd. regarding AC.9 bearing failures and a request for a test set of pistons for a tank engine. | 28th May 1941 | Box 115 \ 4 scan0125 | |
| Bearing finishes, engine component seizing, and the potential use of aluminium and chromium plating. | 1st Dec 1942 | Box 115 \ 4 scan0126 | |
| Letter to Wellworthy Ltd. discussing experience and precautions with Aluminium-tin bearing alloys. | 2nd Feb 1938 | Box 115 \ 5 scan0001 | |
| Providing recommendations for bearing interference fit, working clearances, and crankshaft hardness. | 2nd Feb 1938 | Box 115 \ 5 scan0002 | |
| Oil filtration recommendations and updates on connecting-rod bearings supplied to various manufacturers. | 2nd Feb 1938 | Box 115 \ 5 scan0003 | |
| Letter to Wellworthy Ltd. regarding the supply of bearings and bearing blanks for A.E.C. Ltd. | 2nd Feb 1938 | Box 115 \ 5 scan0004 | |
| Letter from Wellworthy Piston Rings Ltd. regarding the performance of the new R.R. A.C. 6 bearing and requesting blueprints to commence production. | 3rd Feb 1938 | Box 115 \ 5 scan0005 | |
| Letter from Wellworthy Piston Rings Ltd. concerning A.C. Bearing Alloys. | 4th Feb 1938 | Box 115 \ 5 scan0006 | |
| Letter from Wellworthy Piston Rings regarding R.R.A.C.6 bearing material and supply from High Duty Alloys. | 7th Feb 1938 | Box 115 \ 5 scan0007 | |
| Letter to a supplier regarding the production of trial bearings and potential compatibility issues with engines. | 9th Feb 1938 | Box 115 \ 5 scan0008 | |
| Letter to Ariel Motors Ltd. regarding the composition and properties of two bearing material alloys, RR.AC.6 and RR.AC.7. | 16th Mar 1938 | Box 115 \ 5 scan0009 | |
| Report to Ariel Motors Ltd. on a modified bearing alloy, its composition, and application guidance. | 16th Mar 1938 | Box 115 \ 5 scan0010 | |
| Letter from Wellworthy Piston Rings Ltd. to Ariel Motors Ltd. providing recommended bearing clearances. | 21th Mar 1938 | Box 115 \ 5 scan0011 | |
| Letter from Wellworthy Piston Rings Ltd. to High Duty Alloys Ltd. regarding progress on casting dies and bearings for the RR AC.6 and AC.7. | 21th Mar 1938 | Box 115 \ 5 scan0012 | |
| Letter from Wellworthy Piston Rings discussing the manufacture and supply of Aluminium-tin bearings for E.R.A. cars. | 11th Feb 1938 | Box 115 \ 5 scan0013 | |
| Cover letter from Wellworthy Piston Rings Ltd. enclosing a copy of a letter about A.C.6 material. | 28th Mar 1938 | Box 115 \ 5 scan0014 | |
| Letter to High Duty Alloys Ltd. concerning materials for a main floating bearing trial. | 28th Mar 1938 | Box 115 \ 5 scan0015 | |
| Letter from Wellworthy Piston Rings Ltd. regarding an A.C.S. Bearing. | 2nd Apr 1938 | Box 115 \ 5 scan0016 | |
| Letter from Wellworthy Piston Rings Ltd. to Ariel Motors Ltd. regarding the supply of trial bearings. | 2nd Apr 1938 | Box 115 \ 5 scan0017 | |
| Letter to The Excelsior Motor Co. Ltd. concerning the composition and application of AC.6. bearing material. | 2nd Apr 1938 | Box 115 \ 5 scan0018 | |
| Technical letter from Wellworthy Piston Rings Ltd. detailing bearing specifications for interference fit, nip, and working clearances. | 22th Apr 1938 | Box 115 \ 5 scan0019 | |
| Letter concerning Ariel big end bearings and arranging a meeting with Ariel Motors. | 22th Apr 1938 | Box 115 \ 5 scan0020 | |
| Letter from Wellworthy Piston Rings discussing potential collaboration on bearing applications with various firms. | 27th Apr 1938 | Box 115 \ 5 scan0021 | |
| Continuation of a letter from Wellworthy Piston Rings discussing a meeting and a design for a main bearing bush. | 2nd May 1938 | Box 115 \ 5 scan0022 | |
| Correspondence with Wellworthy Piston Rings Ltd. regarding bearing alloy development and production. | 2nd May 1938 | Box 115 \ 5 scan0023 | |
| Letter from Wellworthy Piston Rings Ltd. discussing the demand, experimentation, and proposed use of bearings for soft shafts. | 5th May 1938 | Box 115 \ 5 scan0024 | |
| Letter to W. A. Robotham regarding difficulties producing A.C.6 material and arrangements for castings. | 5th May 1938 | Box 115 \ 5 scan0025 | |
| Letter discussing the performance and production of A.C.6 and A.C.9 bearing alloys with hard and soft shafts. | 6th May 1938 | Box 115 \ 5 scan0026 | |
| Letter to J. Howlett, Esq. discussing the development, performance, and lubrication of various engine bearing alloys. | 9th May 1938 | Box 115 \ 5 scan0027 | |
| Letter from the Personal Secretary at Wellworthy Piston Rings Ltd. acknowledging a letter sent to Mr. Howlett. | 10th May 1938 | Box 115 \ 5 scan0028 | |
| Letter from Wellworthy Piston Rings Ltd. discussing Aluminium-tin bearings and material specifications. | 16th May 1938 | Box 115 \ 5 scan0029 | |
| Continuation letter from supplier Wellworthy Piston Rings Ltd. regarding a misunderstanding over 'L' section ring specifications. | 17th May 1938 | Box 115 \ 5 scan0030 | |
| Telegram received by telephone regarding a proposed visit to AEC. | 17th May 1938 | Box 115 \ 5 scan0031 | |
| Letter to Messrs. Wellworthy Ltd. confirming a visit to the A.E.C. | 17th May 1938 | Box 115 \ 5 scan0032 | |
| Telegram correcting a prior letter regarding a meeting with AEC, proposing Thursday instead of Friday. | 4th Mar 1938 | Box 115 \ 5 scan0033 | |
| Telex message concerning a change of appointment time with AEC. | 18th May 1938 | Box 115 \ 5 scan0034 | |
| Letter from Wellworthy Piston Rings Ltd. regarding the production and testing of RR.AC.6. bearings. | 6th May 1938 | Box 115 \ 5 scan0035 | |
| Letter from Wellworthy Piston Rings Ltd. to Morris Commercial Cars Ltd. regarding crankshaft steel specifications and hardness. | 10th May 1938 | Box 115 \ 5 scan0036 | |
| Letter to Ricardo & Co. detailing the composition and properties of the AC.9 aluminium-tin bearing material. | 23th May 1938 | Box 115 \ 5 scan0037 | |
| Bearing specifications, lubrication, fit, and clearances for connecting rods and main bearings. | 23th May 1938 | Box 115 \ 5 scan0038 | |
| Letter from Wellworthy Piston Rings Ltd. to Messrs. Ricardo & Co. regarding bearing clearances and production delays. | 15th Aug 1938 | Box 115 \ 5 scan0039 | |
| Letter to Wellworthy Piston Rings Ltd. regarding the applications and performance of an aluminium bearing alloy. | 15th Aug 1938 | Box 115 \ 5 scan0040 | |
| Letter from Wellworthy Piston Rings Ltd. enclosing correspondence from other firms about aluminium-tin bearing material. | 2nd Jun 1938 | Box 115 \ 5 scan0041 | |
| Letter from Wellworthy Piston Rings Ltd. concerning a change in material for Aluminium-tin bushes from AC.6 to AC.9. | 2nd Jun 1938 | Box 115 \ 5 scan0042 | |
| Letter to Dennis Bros, Ltd. regarding blueprints, pricing, and production of Aluminium-tin alloy bearings. | 1st Jun 1938 | Box 115 \ 5 scan0043 | |
| Correspondence from Wellworthy Piston Rings Ltd. regarding difficulties with the AC.6 bearing and an oil groove. | 31th May 1938 | Box 115 \ 5 scan0044 | |
| Letter to Bristol Aero Co. Ltd. clarifying the supply of rough-machined connecting rod bush castings. | 31th May 1938 | Box 115 \ 5 scan0045 | |
| Letter to Albion Motors Ltd. detailing the composition and characteristics of AC.9 Aluminium-tin bearing material. | 27th May 1938 | Box 115 \ 5 scan0046 | |
| Bearing materials, lubrication, fitting, and clearance specifications. | 27th May 1938 | Box 115 \ 5 scan0047 | |
| The composition and performance of alternative bearing and valve seat insert materials. | 27th May 1938 | Box 115 \ 5 scan0048 | |
| Letter from Wellworthy Piston Rings Ltd. discussing the composition and performance of different valve seats. | 30th May 1938 | Box 115 \ 5 scan0049 | |
| Letter from Wellworthy Piston Rings Ltd. regarding a supply delay for modified bearings. | 30th May 1938 | Box 115 \ 5 scan0050 | |
| Letter from Wellworthy Pistonrings Ltd regarding the production of a centre main bearing for a 4 cylinder engine. | 20th May 1938 | Box 115 \ 5 scan0051 | |
| Letter from Wellworthy Piston Rings Ltd. to The Excelsior Motor Co. Ltd. regarding a production delay for Aluminium-tin bearings due to material improvements. | 25th May 1928 | Box 115 \ 5 scan0052 | |
| Letter from Wellworthy Piston Rings Ltd. to Leyland Motors Ltd. regarding a delay in an order for bearing shells. | 11th May 1938 | Box 115 \ 5 scan0053 | |
| Letter to High Duty Alloys Ltd. regarding a change in bearing metal specification from A.C.6 to A.C.9. | 23th May 1938 | Box 115 \ 5 scan0054 | |
| Letter from Wellworthy Piston Rings Ltd. regarding a delivery delay for bearings made from RR. AC.6 material. | 19th May 1938 | Box 115 \ 5 scan0055 | |
| Letter to J.W. Howlett regarding the urgent supply of bearings for Leyland cub engines. | 28th Jun 1938 | Box 115 \ 5 scan0056 | |
| Letter discussing the pricing of bearings and asking for a decision on whether to make a formal offer. | 28th Jun 1938 | Box 115 \ 5 scan0057 | |
| Letter to Wellworthy Piston Rings regarding a visit to Dennis Motors and the supply of lead bronze bearings. | 28th Jun 1938 | Box 115 \ 5 scan0058 | |
| Visit to Dennis Bros. to inspect the performance of A.C.6 connecting rod bearings. | 28th Jun 1938 | Box 115 \ 5 scan0059 | |
| Visit to Dennis Bros. regarding engine bearing material issues and a potential filtration solution. | 28th Jun 1938 | Box 115 \ 5 scan0060 | |
| Letter from Wellworthy Piston Rings Ltd. discussing bearing production for Leyland engines, delays due to a high number of orders, and pricing strategy. | 30th Jun 1938 | Box 115 \ 5 scan0061 | |
| Letter discussing competitive strategy for bearings, specification changes, price policy, and production status. | 30th Jun 1938 | Box 115 \ 5 scan0062 | |
| Cost breakdown for the production of half bearing castings. | 2nd Jul 1938 | Box 115 \ 5 scan0063 | |
| Letter to Wellworthy Ltd. proposing prices for the production of bearing blanks for Leyland Motors. | 30th Jun 1938 | Box 115 \ 5 scan0064 | |
| Cover letter forwarding a copy of a letter from Mr. Howlett regarding bearing alloys. | 30th Jun 1938 | Box 115 \ 5 scan0065 | |
| Letter from Wellworthy Piston Rings Ltd. providing a progress report on the production of bearings. | 28th Jun 1938 | Box 115 \ 5 scan0066 | |
| Letter from John Howlett to R. B. Wilson regarding production scheduling, tooling, and delivery priorities for various customers. | 28th Jun 1938 | Box 115 \ 5 scan0067 | |
| List of customer parts, corresponding internal part numbers, and descriptions for jobs in the shops. | 28th Jun 1938 | Box 115 \ 5 scan0068 | |
| Parts list for various engine bearings, cross-referencing manufacturer part numbers. | 1st Jul 1938 | Box 115 \ 5 scan0069 | |
| Letter from Wellworthy Piston Rings Ltd. forwarding a copy of correspondence regarding a works visit. | 1st Jul 1938 | Box 115 \ 5 scan0070 | |
| Letter to High Duty Alloys, Ltd. discussing heat treatment and hardness testing procedures for bearings. | 1st Jul 1938 | Box 115 \ 5 scan0071 | |
| Page two of a letter addressed to W.C. Devereux Esq. regarding a recent visit from a Mr. Richards. | 1st Jul 1938 | Box 115 \ 5 scan0072 | |
| Letter to J. Howlett of Wellworthy Piston Rings Ltd. to arrange a meeting to discuss a bearing situation. | 2nd Jul 1938 | Box 115 \ 5 scan0073 | |
| Letter from Wellworthy Piston Rings specialists regarding Aluminium-tin bearings. | 6th Jul 1938 | Box 115 \ 5 scan0074 | |
| Letter to Scammell Lorries Ltd. regarding specifications and tolerances for RR. AC9 bearings. | 5th Jul 1938 | Box 115 \ 5 scan0075 | |
| Clearances for connecting rod and main bearings. | 5th Jul 1938 | Box 115 \ 5 scan0076 | |
| Letter from Wellworthy Piston Rings Ltd. detailing connecting rod and main bearing clearances. | 4th Jul 1938 | Box 115 \ 5 scan0077 | |
| Letter detailing the composition and properties of the new AC.9 bearing material. | 4th Jul 1938 | Box 115 \ 5 scan0078 | |
| From Wellworthy Piston Rings Ltd. detailing recommended working clearances and nip for connecting rod and main bearings. | 7th Jul 1938 | Box 115 \ 5 scan0079 | |
| Letter from Wellworthy Piston Rings Ltd. forwarding a memorandum and I.A.E. research list regarding bearings. | 7th Jul 1938 | Box 115 \ 5 scan0080 | |
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