| Description | Date | Identifier | |
| Blueprint for a connecting rod top half bearing for Dennis Bros. | 21th Feb 1939 | Box 115 \ 4 scan0007 | |
| Technical drawing of a top half connecting rod bearing for Dennis Bros. | 9th Jun 1939 | Box 115 \ 4 scan0008 | |
| Blueprint for a connecting rod bearing bottom half for Dennis Bros. | 9th Jun 1939 | Box 115 \ 4 scan0009 | |
| Letter to Wellworthy Piston Rings Ltd. regarding a bearing job and the use of A.C.9 material. | 15th Jul 1939 | Box 115 \ 4 scan0010 | |
| Letter from Wellworthy Piston Rings discussing the use of AC.9 bearings for Big Ends and Main Bearings, with reference to Leyland Diesel Engines. | 17th Jul 1939 | Box 115 \ 4 scan0011 | |
| Letter from Wellworthy Piston Rings discussing AC.9 bearings and their performance against chrome plated shafts. | 17th Jul 1939 | Box 115 \ 4 scan0012 | |
| Letter from Wellworthy Piston Rings Limited regarding correspondence with Alta Car & Engineering Co. Ltd. about their bearings. | 19th Jul 1939 | Box 115 \ 4 scan0013 | |
| Letter to Wellworthy Piston Rings Ltd. discussing the use of Babbitt and A.C.9 materials for engine main bearings. | 20th Jul 1939 | Box 115 \ 4 scan0014 | |
| Letter from Wellworthy Piston Rings regarding experiments on AC.9 Main Bearings and Big Ends. | 24th Jul 1939 | Box 115 \ 4 scan0015 | |
| Advice note from Wellworthy Piston Rings for a half bearing and a letter. | 21th Jul 1939 | Box 115 \ 4 scan0016 | |
| Letter from Wellworthy Piston Rings discussing a recurring Big End Bearing failure on a 6-cylinder diesel engine. | 24th Jul 1939 | Box 115 \ 4 scan0017 | |
| Continuation letter from Wellworthy Piston Rings regarding a harder half-bearing sent for examination. | 24th Jul 1939 | Box 115 \ 4 scan0018 | |
| Follow-up letter from Wellworthy Piston Rings Ltd. regarding a failed Big End Bearing from a Dennis Diesel Engine. | 3rd Aug 1939 | Box 115 \ 4 scan0019 | |
| Letter to Wellworthy Ltd. detailing the examination findings of a big end bearing failure. | 21th Aug 1939 | Box 115 \ 4 scan0020 | |
| Letter from Wellworthy Piston Rings Ltd. regarding a Big End Bearing from Dennis Bros. | 22th Aug 1939 | Box 115 \ 4 scan0021 | |
| Letter from Wellworthy Piston Rings regarding bearing failures, discussing oil types and further engine tests. | 30th Aug 1939 | Box 115 \ 4 scan0022 | |
| Letter from a piston ring specialist discussing bearing failures and lubricating oil tests, including an extract from a letter from Dennis Bros. | 4th Sep 1939 | Box 115 \ 4 scan0023 | |
| Continuation of a letter from Wellworthy Piston Rings Ltd. regarding big end bearings. | 4th Sep 1939 | Box 115 \ 4 scan0024 | |
| Letter to Wellworthy Piston Rings Ltd. regarding a failing big end bearing. | 9th Sep 1939 | Box 115 \ 4 scan0025 | |
| Letter from Wellworthy Piston Rings discussing the treatment and properties of AC.9 bearings. | 12th Sep 1939 | Box 115 \ 4 scan0026 | |
| Letter from Wellworthy Piston Rings to W. A. Robotham regarding a supply issue with Bristol. | 12th Sep 1939 | Box 115 \ 4 scan0027 | |
| Letter from Wellworthy Piston Rings Ltd. regarding AC.9 bushes and bearings. | 25th Sep 1939 | Box 115 \ 4 scan0028 | |
| Letter to Wellworthy Piston Rings Ltd. regarding the effect of 'rolling' before heat treatment on engines. | 28th Sep 1939 | Box 115 \ 4 scan0029 | |
| Letter from Wellworthy Piston Rings Ltd. regarding conflicting opinions on the performance of A.C.9 bearings versus a new Cleveland Graphite Company product. | 7th Nov 1939 | Box 115 \ 4 scan0030 | |
| Handling of two half bearings belonging to Leyland. | 10th Nov 1939 | Box 115 \ 4 scan0031 | |
| Letter to J. Howlett of Wellworthy Piston Rings Ltd. discussing the merits and costs of different types of engine bearings. | 10th Nov 1939 | Box 115 \ 4 scan0032 | |
| Letter discussing the suitability of AC.9 as a bearing material for high-speed petrol engines. | 9th Nov 1939 | Box 115 \ 4 scan0033 | |
| Letter from Wellworthy Piston Rings Ltd. discussing engine bearing performance, specifically the A.C.9, and issues at Ford. | 13th Nov 1939 | Box 115 \ 4 scan0034 | |
| Letter to W. A. Robotham arranging a 'day's shooting' with Spitfires in Southampton. | 13th Nov 1939 | Box 115 \ 4 scan0035 | |
| Short memo asking about availability on a Saturday in December. | 22th Nov 1939 | Box 115 \ 4 scan0036 | |
| Letter to Wellworthy Piston Rings discussing Bentley main bearings, production costs and a social invitation for shooting. | 22th Nov 1939 | Box 115 \ 4 scan0037 | |
| Letter from Wellworthy Piston Rings Ltd. regarding a drawing for Bentley main bearings and arranging a meeting. | 27th Nov 1939 | Box 115 \ 4 scan0038 | |
| Letter from Wellworthy Piston Rings Ltd. discussing a discrepancy and manufacturing method for a Bentley main bearing/big end bush. | 28th Nov 1939 | Box 115 \ 4 scan0039 | |
| Letter to W. A. Robotham regarding the design, price, and production of interchangeable bearings. | 28th Nov 1939 | Box 115 \ 4 scan0040 | |
| Drawing of a big end bearing top half for a piston. | 28th Nov 1939 | Box 115 \ 4 scan0041 | |
| Letter to Wellworthy Piston Rings Ltd. regarding the production and pricing of big end bearings. | 30th Nov 1939 | Box 115 \ 4 scan0042 | |
| Clearing a day in someone's schedule. | 30th Nov 1939 | Box 115 \ 4 scan0043 | |
| Confirming travel and accommodation arrangements for a visit to a Mr. Howlett. | 30th Nov 1939 | Box 115 \ 4 scan0044 | |
| Letter to Wellworthy Piston Rings Ltd. discussing the manufacturing process for a big end bearing. | 6th Dec 1939 | Box 115 \ 4 scan0045 | |
| Letter to Wellworthy Piston Rings Ltd. regarding the supply of finished big-ends for AC.9 bearings. | 9th Jan 1940 | Box 115 \ 4 scan0046 | |
| Letter from Wellworthy Piston Rings Ltd. discussing manufacturing tolerances and finishing processes for engine components. | 18th Jan 1940 | Box 115 \ 4 scan0047 | |
| Page 2 of a letter discussing bearing clearances and manufacturing. | 18th Jan 1940 | Box 115 \ 4 scan0048 | |
| Review and approval of a booklet from High Duty Alloys, critiquing its content and aesthetic design. | 21th Feb 1940 | Box 115 \ 4 scan0049 | |
| Letter to Wellworthy Piston Rings Ltd. regarding specifications for flangeless Alum-tin bearings for an engine test. | 29th Feb 1940 | Box 115 \ 4 scan0050 | |
| Letter from Wellworthy Piston Rings Ltd. regarding queries on AC.9 bearings for Bentley engines. | 7th Mar 1940 | Box 115 \ 4 scan0051 | |
| Letter responding to questions about bearing location and the addition of a chamfer. | 11th Mar 1940 | Box 115 \ 4 scan0052 | |
| Letter from Wellworthy Piston Rings Ltd. regarding bearing delivery and a successful engine modification on a Bentley. | 12th Mar 1940 | Box 115 \ 4 scan0053 | |
| Concluding page of a letter addressed to W. A. Robotham. | 12th Mar 1940 | Box 115 \ 4 scan0054 | |
| Letter to Wellworthy Piston Rings Ltd. regarding Simplex rings and oil consumption tests on a Bentley. | 18th Mar 1940 | Box 115 \ 4 scan0055 | |
| Letter from Wellworthy Piston Rings Ltd. regarding a delay in the supply of bearings due to tool-room hold-ups. | 1st Apr 1940 | Box 115 \ 4 scan0056 | |
| Letter from High Duty Alloys Ltd. regarding a new 12% magnesium aluminium alloy, its properties, and manufacturing difficulties. | 17th Apr 1940 | Box 115 \ 4 scan0057 | |
| Letter from High Duty Alloys Ltd. regarding the sharing of information and research progress. | 17th Apr 1940 | Box 115 \ 4 scan0058 | |
| Letter from High Duty Alloys Ltd. regarding arrangements for a Lagonda car to be sent to Derby. | 19th Apr 1940 | Box 115 \ 4 scan0059 | |
| Letter to High Duty Alloys Ltd. acknowledging their correspondence of 17th instant. | 22th Apr 1940 | Box 115 \ 4 scan0060 | |
| Covering note regarding a letter received from High Duty Alloys Ltd. concerning a new alloy. | 22th Apr 1940 | Box 115 \ 4 scan0061 | |
| Letter to Miss Moon at High Duty Alloys Ltd. confirming arrangements for the delivery of a Lagonda car to Derby. | 22th Apr 1940 | Box 115 \ 4 scan0062 | |
| Letter to High Duty Alloys Ltd. clarifying a misunderstanding regarding an alloy enquiry based on RR.50. | 23th Apr 1940 | Box 115 \ 4 scan0063 | |
| Letter from Wellworthy Piston Rings regarding the urgent despatch of bearings for engine testing, addressed to W. A. Robotham. | 24th Apr 1940 | Box 115 \ 4 scan0064 | |
| Clearance and nip specifications for different types of bearings. | 13th May 1940 | Box 115 \ 4 scan0065 | |
| Letter from Wellworthy Piston Rings discussing the failure analysis of AC.9 big end bearings with Leyland Motors and Rolls-Royce. | 13th May 1940 | Box 115 \ 4 scan0066 | |
| Continuation letter from Wellworthy Piston Rings Limited regarding feedback on a material. | 13th Sep 1938 | Box 115 \ 4 scan0067 | |
| Telegram from Blackith Wellworthy chasing a report on AC 9 bearings left the previous Thursday. | 13th Sep 1938 | Box 115 \ 4 scan0068 | |
| Letter from Wellworthy Piston Rings urgently requesting a report on AC.9 bearings following a complaint from Leyland Motors. | 17th May 1940 | Box 115 \ 4 scan0069 | |
| Order for 12 pairs of big end bearings from Wellworthy Pistons Ltd. | 21th May 1940 | Box 115 \ 4 scan0070 | |
| Letter discussing crankshaft drilling and bearing seizure in relation to a big-end failure. | 21th May 1940 | Box 115 \ 4 scan0071 | |
| Letter discussing the metallurgical properties of a seized bearing and the potential effects of reducing tin content. | 29th May 1940 | Box 115 \ 4 scan0072 | |
| Letter to Wellworthy Piston Rings Ltd. discussing engine bearing failures, specifically regarding Leyland engines. | 29th May 1940 | Box 115 \ 4 scan0073 | |
| Letter responding to a query about the action of tin content under high temperature conditions. | 9th Jun 1940 | Box 115 \ 4 scan0074 | |
| Letter to Wellworthy Pistons Ltd. discussing bearing failures at Leyland's, comparing materials and suggesting lubrication system improvements. | 9th Jun 1940 | Box 115 \ 4 scan0075 | |
| Letter discussing engine modifications and diagnosing failures as likely due to oil starvation. | 9th Jun 1940 | Box 115 \ 4 scan0076 | |
| Letter to J. Pilkington of Leyland Motors discussing A.C.9 bearing material issues due to oil shortage. | 10th Jun 1940 | Box 115 \ 4 scan0077 | |
| Letter to Leyland Motors regarding the marketing of an aluminium tin bearing and a misunderstanding about its development. | 13th Jun 1940 | Box 115 \ 4 scan0078 | |
| Letter clarifying a misunderstanding regarding the company's views on different engine bearing materials and associated lubrication systems. | 13th Jun 1940 | Box 115 \ 4 scan0079 | |
| Letter discussing the choice of bearing materials for aircraft engines during a national emergency and seeking clarification on a statement. | 14th Jun 1940 | Box 115 \ 4 scan0080 | |
| Letter from Leyland Motors clarifying a misunderstanding about experiments with material AC.9. | 14th Jun 1940 | Box 115 \ 4 scan0081 | |
| Brief letter to H. Spurrier, Jnr. of Leyland Motors Ltd. regarding a matter involving Pilkington. | 17th Jun 1940 | Box 115 \ 4 scan0082 | |
| Letter to L. Pilkington of Leyland Motors regarding a misunderstanding about A.C.9. bearings. | 18th Jun 1940 | Box 115 \ 4 scan0083 | |
| Letter from Leyland Motors regarding discussions and issues with A.C.9 bearing material. | 18th Jun 1940 | Box 115 \ 4 scan0084 | |
| Technical letter discussing bearing material performance, oil supply issues, and research findings on crankshaft hardness. | 18th Jun 1940 | Box 115 \ 4 scan0085 | |
| Letter from Leyland Motors discussing the performance and failures of different engine bearing materials. | 18th Jun 1940 | Box 115 \ 4 scan0086 | |
| The concluding page of a typed letter signed by V. W. Pilkington. | 19th Jun 1940 | Box 115 \ 4 scan0087 | |
| Request for detailed drawings of sample flangeless big end bearings for chassis work. | 19th Jun 1940 | Box 115 \ 4 scan0088 | |
| Letter from Wellworthy Piston Rings Ltd. regarding the supply of drawings for Big End Bearings. | 22th Jun 1940 | Box 115 \ 4 scan0089 | |
| Letter from Leyland Motors discussing a misunderstanding and ongoing issues with A.C. 9 bearings. | 25th Jun 1940 | Box 115 \ 4 scan0090 | |
| Letter from a supplier defending the performance of their AC.9 bearing material and questioning the decision to discontinue its use. | 6th Jul 1940 | Box 115 \ 4 scan0091 | |
| Page 2 of a letter from the Managing Director regarding the development and use of AC.9 bearing alloy. | 6th Jul 1940 | Box 115 \ 4 scan0092 | |
| Letter to Wellworthy Pistons Ltd. regarding the exceptional condition of die-cast big end bearings after 48,000 miles. | 25th Sep 1940 | Box 115 \ 4 scan0093 | |
| Follow-up letter to Wellworthy Pistons Ltd. regarding die-cast A.C.9 big-end bearings. | 10th Oct 1940 | Box 115 \ 4 scan0094 | |
| Condition of Big End bearings from Chassis 30 G VII after completing 48176 miles. | 14th Oct 1940 | Box 115 \ 4 scan0095 | |
| Letter from Vandervell Products Ltd. acknowledging a letter, a print (Rm.648), and arranging a meeting. | 14th Oct 1940 | Box 115 \ 4 scan0096 | |
| Settlement of queries and outstanding accounts for Vandervell Bearings. | 18th Oct 1940 | Box 115 \ 4 scan0097 | |
| Photograph showing a scored and damaged bearing shell with a broken fragment. | 18th Oct 1940 | Box 115 \ 4 scan0098 | |
| Photograph of a failed bearing shell and a separate fragment of it. | 28th Oct 1940 | Box 115 \ 4 scan0099 | |
| Recommendation to proceed with putting Vandervell bearings in hand forthwith. | 28th Oct 1940 | Box 115 \ 4 scan0100 | |
| Letter to The Hoffmann Manufacturing Co. Ltd. requesting to obtain special bearings to specification No. 117.FS. | 1st Nov 1940 | Box 115 \ 4 scan0101 | |
| Letter to A. Taub of Vauxhall Motors regarding manufacturing capacity for lead bronze bearings and a trip to the USA. | 5th Nov 1940 | Box 115 \ 4 scan0102 | |
| Review of clutch throwout bearings and the effort to eliminate cages. | 9th Nov 1940 | Box 115 \ 4 scan0103 | |
| Letter from Vandervell Products Ltd. regarding proposals for a Layshaft Bush and main bearings for a four cylinder engine. | 18th Oct 1940 | Box 115 \ 4 scan0104 | |
| Scheme to replace roller bearings with Trimetal Vandervell Bushes for a layshaft. | 1st Nov 1940 | Box 115 \ 4 scan0105 | |
| Letter to The Hoffmann Mfg. Co. Ltd. acknowledging receipt of bearings and placing a further order. | 15th Nov 1940 | Box 115 \ 4 scan0106 | |
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