| Description | Date | Identifier | |
| Letter from High Duty Alloys Ltd. regarding a visit to discuss Dennis bearings and lubrication details. | 18th Oct 1937 | Box 116 \ 2 scan0039 | |
| Letter to High Duty Alloys Ltd. regarding faulty bearings with blow holes that had to be scrapped and re-cast. | 18th Oct 1937 | Box 116 \ 2 scan0040 | |
| Letter to High Duty Alloys Ltd. regarding arranging a visit to Dennis Co. | 21th Oct 1937 | Box 116 \ 2 scan0041 | |
| Letter to High Duty Alloys Ltd. proposing dates for a visit to the Dennis Co. | 29th Oct 1937 | Box 116 \ 2 scan0042 | |
| Letter from High Duty Alloys Ltd. arranging a meeting for Mr. Milne and Mr. Matthews. | 1st Nov 1937 | Box 116 \ 2 scan0043 | |
| Letter to W.C. Devereux regarding the supply of material, referencing an attached letter from E.R.A. | 16th Nov 1937 | Box 116 \ 2 scan0044 | |
| Letter to High Duty Alloys Ltd. arranging a visit to Leylands regarding aluminium tin bearings. | 17th Nov 1937 | Box 116 \ 2 scan0045 | |
| Letter to High Duty Alloy Ltd. arranging a visit to Leyland's for a bearing inspection. | 17th Nov 1937 | Box 116 \ 2 scan0046 | |
| Letter from H. G. Herrington of High Duty Alloys Ltd. to W. A. Robotham regarding a scheduling conflict for a visit to Leyland. | 18th Nov 1937 | Box 116 \ 2 scan0047 | |
| Letter from High Duty Alloys Ltd. declining a visit invitation due to short notice. | 18th Nov 1937 | Box 116 \ 2 scan0048 | |
| Letter from High Duty Alloys Ltd. regarding the supply of E.R.A. bearing material as either ingots or cast bearing shells. | 18th Nov 1937 | Box 116 \ 2 scan0049 | |
| Letter to W.C. Devereux of High Duty Alloys Ltd. regarding the use of A.C.6 bearing material on a production basis. | 3rd Dec 1937 | Box 116 \ 2 scan0050 | |
| Telegram-style memo to Alloy, Slough, concerning correspondence, prices and a visit. | 6th Dec 1937 | Box 116 \ 2 scan0051 | |
| Telegram received by telephone requesting a reply regarding bearings for ERH. | 6th Dec 1937 | Box 116 \ 2 scan0052 | |
| Telegram received by telephone requesting a reply regarding bearings for ERA. | 6th Dec 1937 | Box 116 \ 2 scan0053 | |
| Telegram from Slough requesting a reply regarding bearings for ERA alloys. | 6th Dec 1937 | Box 116 \ 2 scan0054 | |
| Letter from High Duty Alloys Ltd. concerning pistons for E.R.A. and enclosing 'Pobottle' booklets. | 14th Dec 1937 | Box 116 \ 2 scan0055 | |
| Letter to W.C. Devereux of High Duty Alloys Ltd., thanking him for 'Pobottle' booklets and requesting an additional set for a Director. | 15th Dec 1937 | Box 116 \ 2 scan0056 | |
| Letter from High Duty Alloys Ltd. acknowledging a previous letter and confirming the dispatch of Pobottle booklets. | 18th Dec 1937 | Box 116 \ 2 scan0057 | |
| Letter to High Duty Alloys Ltd. regarding the use of different bearing metals and alloys for main bearings. | 21th Dec 1937 | Box 116 \ 2 scan0058 | |
| Letter to W.C. Devereux regarding a licensing arrangement with Mr. Vandervelle for manufacturing experimental bearings. | 21th Dec 1937 | Box 116 \ 2 scan0059 | |
| Letter from High Duty Alloys Ltd. to W.A. Robotham regarding an enquiry. | 23th Dec 1937 | Box 116 \ 2 scan0060 | |
| Letter to High Duty Alloys Ltd. regarding a meeting with A.E.C. Ltd. to discuss supplying aluminium bearings. | 29th Dec 1937 | Box 116 \ 2 scan0061 | |
| Letter from High Duty Alloys Ltd. arranging a meeting in Derby. | 31th Dec 1937 | Box 116 \ 2 scan0062 | |
| Letter confirming an upcoming meeting with Mr. Herrington of High Duty Alloys Ltd. | 3rd Jan 1938 | Box 116 \ 2 scan0063 | |
| Letter to W.C. Devereux of High Duty Alloys Ltd. rearranging a meeting. | 7th Jan 1938 | Box 116 \ 2 scan0064 | |
| Letter from High Duty Alloys Ltd. regarding a reply to correspondence and arranging a works visit. | 8th Jan 1938 | Box 116 \ 2 scan0065 | |
| Letter from High Duty Alloys Ltd. arranging a meeting regarding the Northern Aluminium Co. | 6th Jan 1938 | Box 116 \ 2 scan0066 | |
| Letter to W.G. Devereux of High Duty Alloys arranging a factory visit. | 13th Jan 1938 | Box 116 \ 2 scan0067 | |
| Letter from High Duty Alloys Ltd. requesting a meeting be arranged with Morris Commercial Cars Ltd. to discuss bearings. | 3rd Jan 1938 | Box 116 \ 2 scan0068 | |
| Letter from High Duty Alloys Ltd. regarding the preferred form and dimensions for an extruded alloy ingot intended for bearings. | 28th Jan 1938 | Box 116 \ 2 scan0069 | |
| Letter to High Duty Alloys Ltd. concerning the extrusion of AC.7 bearing alloy and proposing tube dimensions. | 2nd Feb 1938 | Box 116 \ 2 scan0070 | |
| Covering letter from High Duty Alloys Ltd. enclosing a copy of a letter to F. Perkins Ltd. | 21th Feb 1938 | Box 116 \ 2 scan0071 | |
| Letter to W.F. Pailing of F. Perkins Ltd. to arrange a meeting concerning Bearing Shells. | 21th Feb 1938 | Box 116 \ 2 scan0072 | |
| The appointment of a specialist from High Duty Alloys to oversee the development of aluminium tin bearing alloys. | 22th Feb 1938 | Box 116 \ 2 scan0073 | |
| Letter from High Duty Alloys Ltd. correcting a previously dictated paragraph regarding a seized bearing. | 22th Feb 1938 | Box 116 \ 2 scan0074 | |
| Letter to High Duty Alloys Ltd. cancelling a visit to Dennis Bros. Ltd. regarding bearing tests. | 23th Feb 1938 | Box 116 \ 2 scan0075 | |
| Short typed message cancelling a visit from Dennis to Perry Alloys, Slough. | 24th Feb 1938 | Box 116 \ 2 scan0076 | |
| Letter from High Duty Alloys Ltd. to Mr. Rowbotham regarding a meeting to discuss a bearing question. | 3rd Mar 1938 | Box 116 \ 2 scan0077 | |
| Letter to W.C. Devereux of High Duty Alloys Ltd. regarding a bearing situation and travel arrangements. | 28th Jun 1938 | Box 116 \ 2 scan0078 | |
| Letter from High Duty Alloys Ltd. regarding correspondence with Wellworthy, bearing manufacturing, and material supplies. | 29th Jun 1938 | Box 116 \ 2 scan0079 | |
| Letter to High Duty Alloys Ltd. regarding magnesium loss in A.C.9 alloy after remelting. | 2nd Aug 1938 | Box 116 \ 2 scan0080 | |
| Letter from High Duty Alloys Ltd. discussing bearing materials and arranging a meeting. | 29th Aug 1938 | Box 116 \ 2 scan0081 | |
| Letter regarding magnesium loss during the remelting of A.C.9 bearing alloy and proposed adjustments to magnesium content. | 30th Aug 1938 | Box 116 \ 2 scan0082 | |
| Letter to High Duty Alloys Ltd. arranging a meeting for the following week. | 2nd Sep 1938 | Box 116 \ 2 scan0083 | |
| Letter from the Experimental Department confirming a visit to High Duty Alloys Ltd. | 7th Sep 1938 | Box 116 \ 2 scan0084 | |
| Letter from High Duty Alloys Ltd. postponing a visit from Mr. C.T. Salt due to the illness of Mr. Herrington. | 9th Sep 1938 | Box 116 \ 2 scan0085 | |
| Letter to W.C. Devereux regarding a bearing job and arranging a liaison between High Duty Alloys, Wellworthys, and Rolls-Royce. | 14th Sep 1938 | Box 116 \ 2 scan0086 | |
| Letter from High Duty Alloys Ltd. proposing alternative meeting dates. | 6th Sep 1938 | Box 116 \ 2 scan0087 | |
| Letter to High Duty Alloys Ltd. acknowledging a meeting postponement and proposing a new location for a discussion. | 13th Sep 1938 | Box 116 \ 2 scan0088 | |
| Letter from High Duty Alloys Ltd. acknowledging receipt of correspondence from W.A. Robotham. | 15th Sep 1938 | Box 116 \ 2 scan0089 | |
| Letter to High Duty Alloys Ltd. about difficulties in obtaining the required Brinell hardness on certain bearings. | 11th Oct 1938 | Box 116 \ 2 scan0090 | |
| Letter from the Experimental Department to High Duty Alloys Ltd. regarding recent correspondence and meetings. | 26th Oct 1938 | Box 116 \ 2 scan0091 | |
| Letter from High Duty Alloys Ltd. enclosing a copy of correspondence sent to Wellworthy Piston Rings Ltd. | 26th Oct 1938 | Box 116 \ 2 scan0092 | |
| Private and confidential letter to a supplier regarding material quality control and foundry issues. | 27th Oct 1938 | Box 116 \ 2 scan0093 | |
| Letter to Wellworthy Piston Rings Ltd. discussing meetings, laboratory reports, and the design of bearings. | 27th Oct 1938 | Box 116 \ 2 scan0094 | |
| Letter to High Duty Alloys Ltd. regarding the manufacture of AC.9 bearings. | 1st Nov 1938 | Box 116 \ 2 scan0095 | |
| Letter to High Duty Alloys Ltd. regarding out-of-specification AC.9 material with high magnesium content. | 4th Nov 1938 | Box 116 \ 2 scan0096 | |
| Letter from High Duty Alloys Ltd. regarding direct communication protocols for supplier queries. | 5th Nov 1938 | Box 116 \ 2 scan0097 | |
| Letter refuting an assumption about the composition of a high magnesium aluminium alloy melt. | 5th Nov 1938 | Box 116 \ 2 scan0098 | |
| Page two of a typed letter to J. Howlett of Wellworthy Piston Rings Ltd regarding a misunderstanding and bearing development. | 5th Nov 1938 | Box 116 \ 2 scan0099 | |
| Requesting recommendations on the manufacturing procedure of AC.9 alloy for a meeting with Wellworthy and High Duty Alloys. | 12th Nov 1938 | Box 116 \ 2 scan0100 | |
| Outlining queries following a meeting with representatives from Wellworthy and High Duty Alloys. | 12th Nov 1938 | Box 116 \ 2 scan0101 | |
| Letter from High Duty Alloys Ltd. regarding the collection and examination of cast A.C.9 bearings. | 12th Nov 1938 | Box 116 \ 2 scan0102 | |
| Meeting notes regarding manufacturing trouble with A.C.9 Alloy and obtaining satisfactory Brinell hardness. | 21th Nov 1938 | Box 116 \ 2 scan0103 | |
| The difficulties of producing A.C.9 alloy to specification and the cooperation with external firms. | 21th Nov 1938 | Box 116 \ 2 scan0104 | |
| List of questions compiled during a meeting concerning production difficulties and manufacturing methods for bearings. | 21th Nov 1938 | Box 116 \ 2 scan0105 | |
| Material specification, mixing instructions, and process details for an alloy. | 1st Nov 1938 | Box 116 \ 2 scan0106 | |
| Chemical analysis procedures for determining tin, manganese, silicon, and iron content. | 21th Nov 1938 | Box 116 \ 2 scan0107 | |
| Chemical analysis procedures for determining the amounts of Magnesium, Nickel, and Copper in an alloy. | 1st Nov 1938 | Box 116 \ 2 scan0108 | |
| Procedures for producing and heat-treating melts, including furnace types, hardness tests and the use of flux. | 1st Nov 1938 | Box 116 \ 2 scan0109 | |
| Experimental melt and casting properties of A.C.9 Bearing Material. | 1st Nov 1938 | Box 116 \ 2 scan0110 | |
| Casting temperatures and results for various components and dies. | 1st Nov 1938 | Box 116 \ 2 scan0111 | |
| Metal casting experiments using various dies and temperatures. | 1st Nov 1938 | Box 116 \ 2 scan0112 | |
| General inference on a casting material's suitability for manufacturing bearings. | 21th Nov 1938 | Box 116 \ 2 scan0113 | |
| Letter from High Duty Alloys Ltd. requesting full working instructions and die temperatures for the manufacture of A.C.9 bearing alloy. | 23th Nov 1938 | Box 116 \ 2 scan0114 | |
| Letter to High Duty Alloys Ltd. forwarding a summary of a discussion held at Derby. | 25th Nov 1938 | Box 116 \ 2 scan0115 | |
| Letter from High Duty Alloys Ltd. enclosing a summary of discussions about the manufacture of A.C.9 Bearing Alloy. | 26th Nov 1938 | Box 116 \ 2 scan0116 | |
| Letter to W.C. Devereux regarding a report on a visit to Germany and arrangements for bearings in France. | 14th Jan 1939 | Box 116 \ 2 scan0117 | |
| Letter from High Duty Alloys Ltd. regarding licence arrangements for materials in France. | 18th Jan 1939 | Box 116 \ 2 scan0118 | |
| Letter to High Duty Alloys Ltd. discussing the performance of an aluminium tin bearing alloy. | 19th Jan 1939 | Box 116 \ 2 scan0119 | |
| Letter from High Duty Alloys Ltd. discussing a bearing question, samples, and sales policy. | 23th Jan 1939 | Box 116 \ 2 scan0120 | |
| Letter to High Duty Alloys Ltd. discussing the procurement and testing of aluminium and magnesium parts for experimental cars. | 11th Dec 1939 | Box 116 \ 2 scan0121 | |
| Letter from High Duty Alloys Ltd. regarding material samples for post-war business. | 18th Dec 1939 | Box 116 \ 2 scan0122 | |
| Letter from High Duty Alloys Ltd. providing material characteristics for Hiduminium and magnesium alloys. | 22th Dec 1939 | Box 116 \ 2 scan0123 | |
| Data sheet detailing the characteristics and applications of sandcast 'Hiduminium' R.R. 53 alloy. | 22th Dec 1939 | Box 116 \ 2 scan0124 | |
| Tensile and hardness test results for heat-treated sand and chill castings at elevated temperatures. | 22th Dec 1939 | Box 116 \ 2 scan0125 | |
| Data sheet for 'Hiduminium' R.R. 50, a general sand and die-casting alloy. | 22th Dec 1939 | Box 116 \ 2 scan0126 | |
| Physical and mechanical properties of 'Hiduminium' R.R. 50 (D.T.D. 133.B). | 22th Dec 1939 | Box 116 \ 2 scan0127 | |
| Data sheet for 'Hiduminium' R.R. 53.C high strength sand and die casting alloy. | 22th Dec 1939 | Box 116 \ 2 scan0128 | |
| Physical and mechanical properties of the alloy 'Hiduminium' R.R. 53.C. | 22th Dec 1939 | Box 116 \ 2 scan0129 | |
| Data sheet for 'Hiduminium' R.R. 59 (L42) wrought alloy for parts working at elevated temperatures. | 22th Dec 1939 | Box 116 \ 2 scan0130 | |
| Physical and mechanical properties of the alloy 'Hiduminium' R.R. 59. | 22th Dec 1939 | Box 116 \ 2 scan0131 | |
| Data sheet for Hiduminium R.R. 56 stampings, detailing physical properties, heat treatment, and performance metrics. | 22th Dec 1939 | Box 116 \ 2 scan0132 | |
| Tensile test results for fully heat-treated stampings of bearing caps and a diesel engine connecting rod. | 22th Dec 1939 | Box 116 \ 2 scan0133 | |
| Data sheet for 'Hiduminium' 72 alloy, detailing properties and heat treatment for extruded, drawn, and rolled sections. | 22th Dec 1939 | Box 116 \ 2 scan0134 | |
| Specification sheet for the physical and mechanical properties of 'Hiduminium' 72. | 22th Dec 1939 | Box 116 \ 2 scan0135 | |
| Data sheet detailing the properties and characteristics of the Hiduminium RR.77 alloy. | 22th Dec 1939 | Box 116 \ 2 scan0136 | |
| Data sheet detailing the physical and mechanical properties of the alloy Hiduminium RR.77. | 22th Dec 1939 | Box 116 \ 2 scan0137 | |
| Data sheet on the anodic treatment of 'Hiduminium' alloys, detailing the Bengough process. | 22th Dec 1939 | Box 116 \ 2 scan0138 | |
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