| Description | Date | Identifier | |
| From Mr. Blackith discussing observations on bearings at Dennis Bros. and Glacier Metal Co. | 30th Jun 1938 | Box 115 \ 5 scan0081 | |
| Summary of various aluminium alloys used for bearing materials. | 1st Mar 1938 | Box 115 \ 5 scan0082 | |
| Letter to Wellworthy Ltd. regarding drawings of bearings required by Leylands. | 8th Jul 1938 | Box 115 \ 5 scan0083 | |
| Copy of a Leyland Motors order for bearing castings to be despatched directly to Wellworthy Piston Rings Ltd. | 7th Jul 1938 | Box 115 \ 5 scan0084 | |
| Letter to J. Howlett of Wellworthy Piston Rings Ltd. regarding the handling of Leyland drawings and other supplier issues. | 9th Jul 1938 | Box 115 \ 5 scan0085 | |
| Message arranging a visit to Wellworthy, Lyminton to discuss a bearing failure. | 11th Jul 1938 | Box 115 \ 5 scan0086 | |
| Letter from Wellworthy Piston Rings Ltd. regarding a bearing failure at 'Dennis', the hardness of the material, and arranging a meeting. | 11th Jul 1938 | Box 115 \ 5 scan0087 | |
| Letter of acknowledgement addressed to John Howlett of Wellworthy Piston Rings Ltd. | 15th Jul 1938 | Box 115 \ 5 scan0088 | |
| Letter to J. Howlett of Wellworthy Piston Rings regarding Perkins Diesel Engine and Dennis Bros. | 18th Jul 1938 | Box 115 \ 5 scan0089 | |
| Letter from Wellworthy Piston Rings Ltd. regarding bearing replacements for Perkins Diesel Engines and a report on a Dennis failure. | 20th Jul 1938 | Box 115 \ 5 scan0090 | |
| Letter from supplier Wellworthy Piston Rings Ltd. concerning the production progress of A.C.9. Bearings. | 18th Aug 1938 | Box 115 \ 5 scan0091 | |
| Page 2 of a letter to W. A. Robotham suggesting a meeting be deferred. | 18th Aug 1938 | Box 115 \ 5 scan0092 | |
| Status report on bearings, detailing deliveries, current orders, and enquiries. | 9th Aug 1938 | Box 115 \ 5 scan0093 | |
| Letter to Wellworthy Piston Rings Ltd discussing work in hand and a potential supply of Aluminium Tin Alloy to Crossley Motors. | 19th Aug 1938 | Box 115 \ 5 scan0094 | |
| Letter from Wellworthy Piston Rings Ltd. regarding the positive test results of A.C.9. bearings for an aircraft engine. | 22th Aug 1938 | Box 115 \ 5 scan0095 | |
| Letter to G.D. Robinson about the road service performance of aluminium tin main bearings and the importance of oil filtration. | 23th Aug 1938 | Box 115 \ 5 scan0096 | |
| Letter to J. Howlett of Wellworthy Piston Rings Ltd. regarding a Bristol fully-floating bush and a proposed visit to De Havilland's. | 24th Aug 1938 | Box 115 \ 5 scan0097 | |
| Letter to Wellworthy Ltd. clarifying production arrangements for centre bearings ordered by E.R.A. Ltd. | 24th Aug 1938 | Box 115 \ 5 scan0098 | |
| Letter from Wellworthy Piston Rings regarding A.C.9 bearings, enclosing correspondence and seeking guidance on whether to abandon the job. | 24th Aug 1938 | Box 115 \ 5 scan0099 | |
| Copy of a letter from Dennis Bros. to Wellworthy Piston Rings regarding a failed test of centre main bearings. | 20th Aug 1938 | Box 115 \ 5 scan0100 | |
| Letter from Dennis Brothers Limited regarding abandoning tests on an aluminium alloy in favour of AC6 material for engine bearings. | 24th Aug 1938 | Box 115 \ 5 scan0101 | |
| Letter to High Duty Alloys Ltd. regarding the supply and performance of engine bearings for Dennis Brothers. | 24th Aug 1938 | Box 115 \ 5 scan0102 | |
| Letter from Wellworthy Piston Rings Ltd. to High Duty Alloys Ltd. regarding A.C.6. bearings. | 24th Aug 1938 | Box 115 \ 5 scan0103 | |
| Letter to Wellworthy Piston Rings Ltd. regarding bearing tests and development with Dennis Bros. | 26th Aug 1938 | Box 115 \ 5 scan0104 | |
| Letter from Wellworthy Piston Rings Limited regarding the manufacture of bearings and lubrication for De Havilland engines. | 26th Aug 1938 | Box 115 \ 5 scan0105 | |
| Letter to Mr. Blackith of Wellworthy Piston Rings Ltd. regarding the scheduling of a visit around a holiday. | 27th Aug 1938 | Box 115 \ 5 scan0106 | |
| Letter from Wellworthy Piston Rings concerning A.C.6 bearings and correspondence with Dennis Brothers and De Havilland. | 30th Aug 1938 | Box 115 \ 5 scan0107 | |
| Letter from Wellworthy Piston Rings arranging meetings to discuss piston rings, test pieces, and High Duty Alloys. | 3rd Sep 1938 | Box 115 \ 5 scan0108 | |
| Letter to F. Blackith of Wellworthy Piston Rings Ltd concerning a meeting with De Havilland. | 14th Sep 1938 | Box 115 \ 5 scan0109 | |
| Letter to Wellworthy Piston Rings discussing a meeting on bearing materials, alloy choices, and technical liaison with other companies. | 14th Sep 1938 | Box 115 \ 5 scan0110 | |
| Business strategy for bearings, technical liaison, and the balance between development and research. | 14th Sep 1938 | Box 115 \ 5 scan0111 | |
| Page 3 of a letter to J.W. Howlett, Esq. discussing an experimental alloy, development funding, and arranging a meeting. | 14th Sep 1938 | Box 115 \ 5 scan0112 | |
| Letter from Wellworthy Piston Rings Ltd. discussing issues with porous bearings and casting policies. | 15th Sep 1938 | Box 115 \ 5 scan0113 | |
| Letter discussing bearing development issues and progress with various clients including Dennis, Bristol, and Leylands. | 15th Sep 1938 | Box 115 \ 5 scan0114 | |
| Letter to W. Robotham Esq. about a new policy for casting bearings to resolve porosity issues and managing communications with H.D.A. | 15th Sep 1938 | Box 115 \ 5 scan0115 | |
| Letter to Wellworthy Piston Rings Ltd. concerning the handover of a bearing job and rig. | 16th Sep 1938 | Box 115 \ 5 scan0116 | |
| Letter to Wellworthy Piston Rings Ltd. forwarding communication and drawings from Crossley Motors Ltd. | 19th Sep 1938 | Box 115 \ 5 scan0117 | |
| Letter from Wellworthy Piston Rings regarding a proposed call upon De Havilland to discuss a bearing question. | 19th Sep 1938 | Box 115 \ 5 scan0118 | |
| Letter from Wellworthy Piston Rings Limited regarding missing drawings from a previous correspondence. | 20th Sep 1938 | Box 115 \ 5 scan0119 | |
| Letter from Wellworthy Piston Rings discussing a material specification issue for bearing production. | 20th Sep 1938 | Box 115 \ 5 scan0120 | |
| Letter to High Duty Alloys Ltd. regarding out-of-spec copper and magnesium content in AC.9 bearing material samples. | 20th Sep 1938 | Box 115 \ 5 scan0121 | |
| Letter from Wellworthy Piston Rings Ltd. concerning the analysis of magnesium content in a supplied material. | 21th Sep 1938 | Box 115 \ 5 scan0122 | |
| Letter from Wellworthy Piston Rings Ltd. enclosing correspondence concerning AC.9 bearing material. | 21th Sep 1938 | Box 115 \ 5 scan0123 | |
| Letter from Wellworthy Piston Rings Ltd. concerning light alloys for bearings and heat treatment of R.R. AC.9 material. | 19th Sep 1938 | Box 115 \ 5 scan0124 | |
| Letter from Wellworthy Piston Rings Ltd. regarding a change in the supply material for bearings for a new Diesel Engine. | 19th Sep 1938 | Box 115 \ 5 scan0125 | |
| Letter from Wellworthy Piston Rings Ltd. to Dennis Bros, Ltd. regarding the supply of bearings in AC.9 material. | 21th Sep 1938 | Box 115 \ 5 scan0126 | |
| Letter from Wellworthy Piston Rings Ltd. regarding a production problem with scrapped castings due to incorrect metal analysis. | 21th Sep 1938 | Box 115 \ 5 scan0127 | |
| Letter to Wellworthy Piston Rings Ltd. regarding a bearing job, magnesium loss, and re-melting tests. | 22th Sep 1938 | Box 115 \ 5 scan0128 | |
| Letter clarifying a recommendation for correcting low copper content in A.C.9 material, which was ultimately scrapped. | 22th Sep 1938 | Box 115 \ 5 scan0129 | |
| Letter to High Duty Alloys Ltd. concerning magnesium loss in A.C.9 alloy during remelting. | 2nd Aug 1938 | Box 115 \ 5 scan0130 | |
| Letter to Wellworthy Piston Rings Ltd. concerning issues with adding magnesium to re-melted bearing alloy. | 23th Sep 1938 | Box 115 \ 5 scan0131 | |
| Letter to Wellworthy Piston Rings Ltd. confirming the correct amount of magnesium to add to a melt. | 23th Sep 1938 | Box 115 \ 5 scan0132 | |
| Letter to Wellworthy Piston Rings Ltd. regarding a bearing rig for testing. | 23th Sep 1938 | Box 115 \ 5 scan0133 | |
| Letter from Wellworthy Piston Rings regarding a bearing test rig and a planned meeting in Derby. | 26th Sep 1938 | Box 115 \ 5 scan0134 | |
| Letter from Wellworthy Piston Rings regarding the addition of magnesium and a copper-aluminium alloy to meet specification. | 26th Sep 1938 | Box 115 \ 5 scan0135 | |
| Letter from Wellworthy Piston Rings Ltd. discussing magnesium loss and low copper content in castings for bearings. | 26th Sep 1938 | Box 115 \ 5 scan0136 | |
| Letter from Wellworthy Piston Rings Ltd. concerning delivery failures and replacement materials. | 26th Sep 1938 | Box 115 \ 5 scan0137 | |
| Letter from Wellworthy Piston Rings Ltd. regarding a letter about bearings sent to High Duty Alloys. | 29th Sep 1938 | Box 115 \ 5 scan0138 | |
| Letter to High Duty Alloys Ltd. regarding setbacks in developing and casting bearings with new alloys. | 29th Sep 1938 | Box 115 \ 5 scan0139 | |
| Letter discussing bearing machining, the status of the order book for various clients, and strategies for handling production delays. | 11th Oct 1938 | Box 115 \ 5 scan0140 | |
| Letter to Wellworthy Piston Rings Ltd. arranging a visit to Lymington to discuss a bearing job. | 11th Oct 1938 | Box 115 \ 5 scan0141 | |
| Cover letter from Wellworthy Piston Rings Ltd. forwarding a copy of a letter concerning an A.C.9. bearing. | 14th Oct 1938 | Box 115 \ 5 scan0142 | |
| Letter to H.C. Hall regarding a report from Bristol on the trial of A.C.9 aluminium tin bearings. | 14th Oct 1938 | Box 115 \ 5 scan0143 | |
| Failure of a big end bush and proposing alternative materials or manufacturing methods. | 14th Oct 1938 | Box 115 \ 5 scan0144 | |
| Letter from Wellworthy Piston Rings Ltd. enclosing a memorandum with reference to AO.9. | 17th Oct 1938 | Box 115 \ 5 scan0145 | |
| Investigation into the magnesium content and casting process of AC.9 bearing material. | 17th Oct 1938 | Box 115 \ 5 scan0146 | |
| The analysis of bearings, discussing magnesium loss, material defects, and recommending a standardized hardness test. | 12th Oct 1938 | Box 115 \ 5 scan0147 | |
| Pending analysis of bearings for segregation and magnesium content to achieve a desired hardness. | 12th Oct 1938 | Box 115 \ 5 scan0148 | |
| Letter to Wellworthy Piston Rings Ltd. regarding the arrangement of a meeting in Derby. | 26th Oct 1938 | Box 115 \ 5 scan0149 | |
| Letter from Wellworthy Piston Rings concerning bearing material specifications and a proposed meeting. | 29th Oct 1938 | Box 115 \ 5 scan0150 | |
| Letter from Wellworthy Piston Rings Ltd. concerning a seized half bearing and experiments with Albions. | 29th Oct 1938 | Box 115 \ 5 scan0151 | |
| Continuation letter from Wellworthy Piston Rings Ltd. regarding an engine seizure due to bearing failure. | 1st Nov 1938 | Box 115 \ 5 scan0152 | |
| Letter from Wellworthy Piston Rings regarding Aluminium-tin AC.9 bearings and future order summaries. | 1st Nov 1938 | Box 115 \ 5 scan0153 | |
| Letter to Wellworthy Piston Rings Ltd. regarding manufacturing troubles with AC.9, a proposed meeting, and trial bearings. | 1st Nov 1938 | Box 115 \ 5 scan0154 | |
| Letter to Wellworthy Piston Rings Ltd. regarding a more efficient method of information exchange. | 1st Nov 1938 | Box 115 \ 5 scan0155 | |
| Letter to Wellworthy Piston Rings Ltd. concerning bearing lubrication and oil hole configuration in response to an enquiry from Messrs. Lister & Co. | 3rd Nov 1938 | Box 115 \ 5 scan0156 | |
| Letter from a piston ring specialist regarding enquiries for big end bushes, trial bearings and proposed site visits. | 4th Nov 1938 | Box 115 \ 5 scan0157 | |
| Concluding page of a letter from Wellworthy Piston Rings Ltd. | 4th Nov 1938 | Box 115 \ 5 scan0158 | |
| Letter to High Duty Alloys Ltd. arranging a works visit to investigate AC.9 material. | 4th Nov 1938 | Box 115 \ 5 scan0159 | |
| Letter to a supplier regarding bearing material with high magnesium content and potential solutions. | 4th Nov 1938 | Box 115 \ 5 scan0160 | |
| Page two of a letter addressed to Wellworthy Piston Rings Ltd. | 4th Nov 1938 | Box 115 \ 5 scan0161 | |
| Letter from Wellworthy Piston Rings Ltd. concerning an upcoming meeting about AC.9 bearings. | 7th Nov 1938 | Box 115 \ 5 scan0162 | |
| Letter to Wellworthy Piston Rings Ltd. regarding the confirmation of a visit. | 8th Nov 1938 | Box 115 \ 5 scan0163 | |
| Letter from Wellworthy Piston Rings Ltd. regarding mixing surplus material to correct the Magnesium and Copper content of a batch. | 8th Nov 1938 | Box 115 \ 5 scan0164 | |
| Letter to Wellworthy Piston Rings Ltd. regarding oil pressure, a carbon steel shaft, and main bearing specifications for a Ruston & Hornsby engine. | 11th Nov 1938 | Box 115 \ 5 scan0165 | |
| Requesting suggestions to answer queries from a meeting with Wellworthy and High Duty Alloys. | 12th Nov 1938 | Box 115 \ 5 scan0166 | |
| Requesting suggestions for recommendations regarding the manufacturing procedure of AC.9 alloy, following a meeting with Wellworthy and High Duty Alloys. | 12th Nov 1938 | Box 115 \ 5 scan0167 | |
| Letter from Wellworthy Piston Rings regarding a bearing job, heat-treatment, and hardness checking. | 14th Nov 1938 | Box 115 \ 5 scan0168 | |
| Letter regarding AC.9 bearings for Ruston & Hornsby, detailing a testing and heat treatment plan with High Duty Alloys. | 14th Nov 1938 | Box 115 \ 5 scan0169 | |
| Letter from Wellworthy Piston Rings Ltd. regarding Brinell hardness testing specifications. | 15th Nov 1938 | Box 115 \ 5 scan0170 | |
| The heat-treatment and hardness testing procedures for castings. | 15th Nov 1938 | Box 115 \ 5 scan0171 | |
| Chemical analysis procedure for determining the composition of a bearing alloy. | 16th Nov 1938 | Box 115 \ 5 scan0172 | |
| Letter from Wellworthy Piston Rings regarding a meeting report and querying the melting temperature of aluminium. | 16th Nov 1938 | Box 115 \ 5 scan0173 | |
| Page two of a letter to W. R. Robotham concerning a meeting and production orders. | 16th Nov 1938 | Box 115 \ 5 scan0174 | |
| Report of a visit to discuss the Brinell hardness specification of AC.9 bearings. | 9th Nov 1936 | Box 115 \ 5 scan0175 | |
| Discussions and actions on material hardness testing and heat treatment for bearings and bushes. | 9th Nov 1936 | Box 115 \ 5 scan0176 | |
| Meeting discussing the analysis and hardness of AC.9 material and a communication breakdown regarding foundry procedures. | 9th Nov 1936 | Box 115 \ 5 scan0177 | |
| Report discussing deviations from material specifications, specifically magnesium content and hardness, in the production of bearings and bushes. | 9th Nov 1936 | Box 115 \ 5 scan0178 | |
| Foundry practices, investigation of bushes, and the machining process for bearings. | 14th Nov 1938 | Box 115 \ 5 scan0179 | |
| Outlining issues with bearings and dowel pins, and listing discussion points for AC.9 manufacture. | 14th Nov 1938 | Box 115 \ 5 scan0180 | |
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