| Description | Date | Identifier | |
| Laboratory report detailing the mechanical test results for a heat-treated S82 steel bar. | 28th Oct 1936 | Box 142 \ 4 scan0062 | |
| Recommendations on changing manufacturing from castings to hot pressings for various parts. | 17th Dec 1936 | Box 142 \ 4 scan0063 | |
| List of notes and decisions on various engineering parts, sheet 2. | 21th Dec 1936 | Box 142 \ 4 scan0064 | |
| Letter to The Birmingham Aluminium Casting Co. Ltd. acknowledging a quotation for Brake Drums. | 21th Dec 1936 | Box 142 \ 4 scan0065 | |
| Requesting a quotation for die casting a Phantom III oil filter body to standardise the part. | 22th Dec 1936 | Box 142 \ 4 scan0066 | |
| Quotation from Birmingham Aluminium Casting Co. for Rocker Cover E.61130, comparing RR Metal and Z Alloy prices. | 23th Dec 1936 | Box 142 \ 4 scan0067 | |
| Comparing the internal works cost against an outside supplier's price for a Filter Body Diecasting. | 23th Dec 1936 | Box 142 \ 4 scan0068 | |
| Quotation from Midland Motor Cylinder Co. Ltd. for Phantom III cylinder liners, detailing prices for different specifications and quantities. | 29th Dec 1936 | Box 142 \ 4 scan0069 | |
| Letter from the Experimental Department acknowledging a communication from The Birmingham Aluminium Casting (1903) Company Ltd. | 29th Dec 1936 | Box 142 \ 4 scan0070 | |
| Use of scrap metal for rocker covers and wheel cases, comparing costs and quality. | 29th Dec 1936 | Box 142 \ 4 scan0071 | |
| Comparing the price of two Top Half Crankcases from Birmingham Aluminium Castings Co. | 30th Dec 1936 | Box 142 \ 4 scan0072 | |
| Cost savings and accounting procedure for using scrap metal for casting parts. | 1st Jan 1937 | Box 142 \ 4 scan0073 | |
| Comparing the cost of a quoted Bentley Bottom Half Crankcase casting against the factory cost, and considering different alloys. | 2nd Jan 1937 | Box 142 \ 4 scan0074 | |
| Labour saving potential of using die casting for a Bentley part and requesting quotations from other firms. | 7th Jan 1937 | Box 142 \ 4 scan0075 | |
| Clarifying the cost of R.R.50 aluminium alloy and comparing it with cheaper alternatives for potential use. | 27th Jan 1937 | Box 142 \ 4 scan0076 | |
| Recommending the use of Z.3 aluminium die-casting alloy for the Wraith bottom half. | 27th Jan 1937 | Box 142 \ 4 scan0077 | |
| Comparing die-casting quotations for an aluminium Bentley crankcase from three different suppliers. | 27th Jan 1937 | Box 142 \ 4 scan0078 | |
| Cost savings on alloys and a proposal for a ribbed design for crankcase die casting. | 27th Jan 1937 | Box 142 \ 4 scan0079 | |
| Letter to Birmingham Aluminium Castings enquiring about the supply of Nelson Bohnalite Autothermic Pistons for testing. | 29th Jan 1937 | Box 142 \ 4 scan0080 | |
| Cost analysis of using virgin versus scrap aluminium for chassis production. | 29th Jan 1937 | Box 142 \ 4 scan0081 | |
| Summary of steel castings ordered for experimental purposes for Wraith, Phantom III and Bentley III chassis. | 13th Aug 1937 | Box 142 \ 4 scan0082 | |
| Disappointing foundry conditions, material test results, and arrangements for sample castings for the Bentley III. | 13th Aug 1937 | Box 142 \ 4 scan0083 | |
| Comparison between suppliers Gabriels and Jessops for the production of castings, detailing delivery times and material properties. | 13th Aug 1937 | Box 142 \ 4 scan0084 | |
| Suggesting the need for permanent machinery to investigate new materials. | 20th Aug 1937 | Box 142 \ 4 scan0085 | |
| Procedure for investigating new materials, specifically focusing on a case involving steel castings. | 23th Aug 1937 | Box 142 \ 4 scan0086 | |
| Poor quality of steel castings received from Jessop's for Bentley and Wraith suspension components. | 23th Nov 1937 | Box 142 \ 4 scan0087 | |
| Casting errors on a Main Lever Housing from Jessop's. | 23th Nov 1937 | Box 142 \ 4 scan0088 | |
| List of casting errors for a Main Lever Housing from Jessop's. | 2nd Apr 1938 | Box 142 \ 4 scan0089 | |
| Listing die castings and their production approval status. | 2nd Apr 1938 | Box 142 \ 4 scan0090 | |
| Typed list of parts with handwritten annotations and confirmations. | 2nd Apr 1938 | Box 142 \ 4 scan0091 | |
| Listing die castings and requesting a design permanence review. | 4th Apr 1938 | Box 142 \ 4 scan0092 | |
| Typed list of component part numbers and their descriptions. | 4th Apr 1938 | Box 142 \ 4 scan0093 | |
| The issuance of drawings for Dies for the Wraith lll model. | 1st Apr 1938 | Box 142 \ 4 scan0094 | |
| List of part numbers and their corresponding names. | 1st Apr 1938 | Box 142 \ 4 scan0095 | |
| The suitability of parts for the Wraith model for die casting versus sand casting. | 12th Apr 1938 | Box 142 \ 4 scan0096 | |
| Status report on tooling dies, listing parts released and parts held up. | 12th Apr 1938 | Box 142 \ 4 scan0097 | |
| Discrepancies and modifications to tool orders for stabilised die castings for the Wraith model. | 25th Apr 1938 | Box 142 \ 4 scan0098 | |
| Release and standardisation of stabilised die castings for the Wraith model, specifically the clutch casing and jack supports. | 30th Apr 1938 | Box 142 \ 4 scan0099 | |
| The status and proposed changes for various die-cast parts. | 2nd May 1938 | Box 142 \ 4 scan0100 | |
| Suitability of die casting for various Wraith model components. | 10th May 1938 | Box 142 \ 4 scan0101 | |
| Die castings for the Wraith model, attaching a report on controversial items. | 10th May 1938 | Box 142 \ 4 scan0102 | |
| Alteration of drawings and future procedures for die castings for the Wraith model. | 11th May 1938 | Box 142 \ 4 scan0103 | |
| Confirming the production status of various items for which dies are in progress. | 13th May 1938 | Box 142 \ 4 scan0104 | |
| Die castings for the Wraith model and a request to correct the drawings. | 11th May 1938 | Box 142 \ 4 scan0105 | |
| With recommendations on using die castings for various Wraith model parts. | 10th May 1938 | Box 142 \ 4 scan0106 | |
| Secret memo discussing the high cost of aluminium castings for the Chassis Division and suggesting Vickers as a supplier. | 26th May 1938 | Box 142 \ 4 scan0107 | |
| Weight of the Bentley 50 Cylinder & Crankcase in comparison to Chevrolet and Oldsmobile components. | 31th May 1938 | Box 142 \ 4 scan0108 | |
| Discussion with Birmingham Aluminium Co. about more economical production of aluminium castings for the Phantom III. | 1st Jun 1938 | Box 142 \ 4 scan0109 | |
| Request to the Pattern Shop for a pattern and core-box for EW 1000 for the experimental department. | 6th Aug 1938 | Box 142 \ 4 scan0110 | |
| The cost discrepancy in charging for aluminium sand castings made from reclaimed aero scrap. | 30th Sep 1938 | Box 142 \ 4 scan0111 | |
| The successful testing of L.5 alloy in Bentley aluminium sand castings. | 3rd Oct 1938 | Box 142 \ 4 scan0112 | |
| Proposal outlining modifications for differentiating Aero and Chassis aluminium sand castings for cost and material tracking. | 17th Oct 1938 | Box 142 \ 4 scan0113 | |
| Treating engine crankcases and sumps, comparing cellulose paint to linseed oil. | 18th Oct 1938 | Box 142 \ 4 scan0114 | |
| Pattern modification for an 8-cylinder exhaust valve guide. | 25th Nov 1938 | Box 142 \ 4 scan0115 | |
| Page from the journal 'Production Lines' discussing various automotive industry topics. | 11th Mar 1939 | Box 142 \ 4 scan0116 | |
| Article on the diesel engines used by Lufthansa, alongside an advertisement for Atlas Drop Forgings. | 11th Mar 1939 | Box 142 \ 4 scan0117 | |
| Comparison of Ley's 'Black Heart' malleable iron castings against British Standards Institution specifications. | 25th Jan 1940 | Box 142 \ 4 scan0118 | |
| Meeting notes regarding the chassis programme and foundry work for engine castings. | 25th Jan 1940 | Box 142 \ 4 scan0119 | |
| Production of six and eight-cylinder engines and the management of experimental chassis patterns. | 25th Jan 1940 | Box 142 \ 4 scan0120 | |
| Use of magnesium for casting various car parts, including induction pipes, rocker covers, and axle centre casings. | 6th Feb 1940 | Box 142 \ 4 scan0121 | |
| Status report on various dies manufactured for use on Bentley 5, indicating their suitability for production. | 13th Feb 1940 | Box 142 \ 4 scan0122 | |
| Castings from patterns RE.107 and RE.112, and a preliminary experiment for part D.13256/1. | 19th Jul 1941 | Box 142 \ 4 scan0123 | |
| Internal request to order three test castings in Electron Metal from Sterling Metals Ltd. | 9th Sep 1925 | Box 142 \ 4 scan0124 | |
| Attaching a pamphlet on machining Electron Metal and noting the production of test pieces. | 19th Sep 1925 | Box 142 \ 4 scan0125 | |
| Guide to the machining of Electron metal, covering turning, milling, drilling, and grinding operations. | 19th Sep 1925 | Box 142 \ 4 scan0126 | |
| Instructions for fine finishing and handling the flammability of Elektron metal swarf. | 19th Sep 1925 | Box 142 \ 4 scan0127 | |
| The fire risk and proper handling of metal turnings and filings. | 22th Apr 1926 | Box 142 \ 4 scan0128 | |
| Issue of noisy tappets in Phantom engines and tests on different push rod materials. | 22th Apr 1926 | Box 142 \ 4 scan0129 | |
| Table comparing valve clearance changes for various materials at 80°C, with associated test notes. | 7th Jul 1926 | Box 142 \ 4 scan0130 | |
| Recommending the use of lead bronze ('Kelmit') and stainless steel ('Staybrite') to prevent parts from seizing and rusting. | 7th Jul 1926 | Box 142 \ 4 scan0131 | |
| Material advancements for chassis components, drawn from a chemical engineering publication. | 20th Dec 1927 | Box 142 \ 4 scan0132 | |
| Automobile finishes, synthetic resins like Bakelite, and coated textiles for roofing. | 20th Dec 1927 | Box 142 \ 4 scan0133 | |
| Different types of plating materials and fuel anti-knock properties. | 17th Dec 1927 | Box 142 \ 4 scan0134 | |
| The development and types of automotive oils, antifreeze, spark plugs, and batteries. | 17th Dec 1927 | Box 142 \ 4 scan0135 | |
| Abrasives and grinding methods, covering material types, wheel developments, and lubricants. | 10th Dec 1926 | Box 142 \ 4 scan0136 | |
| Visit from Major Sturrock of Rootes Ltd. to discuss the supply of white metal and bronze. | 10th Dec 1926 | Box 142 \ 4 scan0137 | |
| Review of published work on Nickel and Nickel Chromium in Cast Iron. | 10th Dec 1926 | Box 142 \ 4 scan0138 | |
| Author's biography and information about the Bureau of Information-on Nickel. | 1st Oct 1927 | Box 142 \ 4 scan0139 | |
| Review of published work on Nickel and Nickel-Chromium in Cast Iron, including a detailed bibliography. | 1st Oct 1927 | Box 142 \ 4 scan0140 | |
| Technical paper discussing the influence of nickel on the properties of cast iron and its various alloys. | 25th May 1928 | Box 142 \ 4 scan0141 | |
| Metal spraying process for rust prevention and parts restoration by Alumino-Thermic and Metal Sprayers Ltd. | 25th May 1928 | Box 142 \ 4 scan0142 | |
| Process of spraying metal for protection on components like exhaust systems, silencer snouts, and battery boxes. | 3rd Jul 1928 | Box 142 \ 4 scan0143 | |
| Performance, casting difficulties, and potential uses of Mr. Hall's Light Alloy. | 20th Aug 1928 | Box 142 \ 4 scan0144 | |
| Properties and potential applications of zinc die castings for smaller car parts. | 21th Oct 1932 | Box 142 \ 4 scan0145 | |
| Visit to Messrs. Fescol to discuss chromium deposition processes for engine parts. | 14th Jun 1935 | Box 142 \ 4 scan0146 | |
| The submission of Stellite samples from Thos. Firth & John Brown for engine testing. | 17th Apr 1935 | Box 142 \ 4 scan0147 | |
| Proposal to use chromium and nickel plating on aluminium pistons and cylinder blocks to dispense with steel liners. | 23th Sep 1935 | Box 142 \ 4 scan0148 | |
| Data sheet detailing the mechanical properties and applications of Firth-Vickers steels. | 25th Oct 1935 | Box 142 \ 4 scan0149 | |
| Inquiry to The Midland Motor Cylinder Co. Ltd. regarding the material 'Chromidium' for brake drums. | 16th Jan 1936 | Box 142 \ 4 scan0150 | |
| Letter to The Northern Aluminium Co. Ltd. inquiring about the properties of their 'Lo-Ex' Piston aluminium alloy. | 14th Jan 1936 | Box 142 \ 4 scan0151 | |
| Inquiry to Harold Andrews Grinding Co. Ltd. for technical data on a Nickel-Copper-Chromium alloy for use as a brake drum liner. | 14th Jan 1936 | Box 142 \ 4 scan0152 | |
| Letter from Northern Aluminium Company providing a graph showing the tensile strength and physical properties of 'Lo-Ex' piston alloy. | 17th Jan 1936 | Box 142 \ 4 scan0153 | |
| Material properties sheet for No. 132 'LO-EX' Aluminium Alloy, detailing expansion coefficient and Brinell hardness. | 17th Jan 1936 | Box 142 \ 4 scan0154 | |
| Graph showing the tensile strength of LO-EX Alloy at elevated temperatures. | 21th Jan 1936 | Box 142 \ 4 scan0155 | |
| Letter from Midland Motor Cylinder Co Ltd providing material specifications for 'CHROMIDIUM' Iron. | 21th Jan 1936 | Box 142 \ 4 scan0156 | |
| Letter from The Midland Motor Cylinder Co. Ltd. regarding the particulars of 'CHROMIDIUM' Iron. | 21th Jan 1936 | Box 142 \ 4 scan0157 | |
| Covering letter regarding a pending photomicrograph for Whitfield, Lake & Elliott. | 29th Jan 1936 | Box 142 \ 4 scan0158 | |
| Letter to Messrs. Lake & Elliot concerning photomicrographs and the quality of 'Millenite' cast-iron. | 30th Jan 1936 | Box 142 \ 4 scan0159 | |
| Replacement alloy for sand castings with bearing surfaces, detailing its superior properties. | 30th Jan 1936 | Box 142 \ 4 scan0160 | |
| Letter arranging a meeting and enclosing a photomicrograph of an iron specimen for a braking surface. | 3rd Feb 1936 | Box 142 \ 4 scan0161 | |
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