| Description | Date | Identifier | |
| Letter from Coopers Mechanical Joints Limited enclosing a book about cylinder head gaskets. | 20th Apr 1938 | Box 132 \ 4 scan0135 | |
| Letter discussing a draft paper on cylinder wear and a proposed methodology for testing materials. | 16th May 1938 | Box 132 \ 4 scan0136 | |
| Expense of re-boring cylinders and suggesting alternative solutions. | 8th Jun 1938 | Box 132 \ 4 scan0137 | |
| Letter to Richard Klinger Ltd. discussing gasket comparison results, ordering a supply, and cost considerations. | 9th Jun 1938 | Box 132 \ 4 scan0138 | |
| Letter to R. Klinger Ltd. regarding quotations for rocker cover and cylinder head joints. | 9th Jun 1938 | Box 132 \ 4 scan0139 | |
| Letter from Richard Klinger Ltd. regarding the supply of Sump Rocker Cover Joints using Klinger-Black material. | 14th Jun 1938 | Box 132 \ 4 scan0140 | |
| Letter from Richard Klinger Ltd. regarding a quotation for cylinder head gaskets to drawing EW.1014. | 16th Jun 1938 | Box 132 \ 4 scan0141 | |
| Letter to Richard Klinger Ltd. regarding quotations and samples for gaskets and joints. | 22th Jun 1938 | Box 132 \ 4 scan0142 | |
| Letter from Super Oil Seals & Gaskets Ltd. following up on a sales visit and offering to supply samples of Steelbestos material for testing. | 23th Jun 1938 | Box 132 \ 4 scan0143 | |
| Letter from Richard Klinger Ltd. confirming a quotation for cylinder head gaskets and advising on the dispatch of samples. | 23th Jun 1938 | Box 132 \ 4 scan0144 | |
| Letter to W. Helmore of Cambridge Engineering Laboratory discussing corrosion, cylinder bore wear and sending drawings of loose liners for testing. | 29th Jun 1938 | Box 132 \ 4 scan0145 | |
| Letter to a supplier, Richard Klinger Ltd., urgently requesting the despatch of 12 cylinder head gaskets. | 5th Jul 1938 | Box 132 \ 4 scan0146 | |
| Modifications to the cylinder head for increased push rod clearance on Wraith III and Bentley 111 models. | 2nd Jul 1938 | Box 132 \ 4 scan0147 | |
| Problem of cylinder bore wear in engines, particularly Bentleys. | 6th Jul 1938 | Box 132 \ 4 scan0148 | |
| Causes of cylinder bore wear and the need for further testing on a new cylinder material. | 6th Jul 1938 | Box 132 \ 4 scan0149 | |
| Letter from Richard Klinger Ltd concerning a potential quality issue with an order of gaskets and the dispatch of a replacement batch. | 6th Jul 1938 | Box 132 \ 4 scan0150 | |
| Returning incorrect cylinder head gaskets and receiving correct ones from Richard Klinger Ltd. | 8th Jul 1938 | Box 132 \ 4 scan0151 | |
| Requesting an alteration to a drawing for a cylinder head water jacket modification. | 21th Jul 1938 | Box 132 \ 4 scan0152 | |
| Letter discussing full-scale cylinder bore wear tests and the potential solution of chromium-plated bores. | 2nd Aug 1938 | Box 132 \ 4 scan0153 | |
| Questioning the necessity of a requested modification for a cylinder head to facilitate moulding. | 5th Aug 1938 | Box 132 \ 4 scan0154 | |
| Letter discussing chromium plating as a promising method for engine bore treatment and referencing work by Rover. | 8th Aug 1938 | Box 132 \ 4 scan0155 | |
| Research on alloy cast iron cylinder bore wear, comparing sand and centrifugally cast materials. | 9th Aug 1938 | Box 132 \ 4 scan0156 | |
| Comparison of different metal alloys for use in cylinder blocks and liners. | 9th Aug 1938 | Box 132 \ 4 scan0157 | |
| Comparison of materials and production costs for cylinder liners and cylinder blocks. | 9th Aug 1938 | Box 132 \ 4 scan0158 | |
| Problem of cylinder bore wear and proposing investigations into new materials for liners or integral block castings. | 10th Aug 1938 | Box 132 \ 4 scan0159 | |
| Order for two dozen 'Neuprene' bushes with specific dimensions. | 11th Aug 1938 | Box 132 \ 4 scan0160 | |
| Production, machining, and identification stamping of cylinder liners for Wraith units. | 16th Aug 1938 | Box 132 \ 4 scan0161 | |
| Cylinder material tests for the Wraith, requesting sample rings for an engineering laboratory. | 19th Aug 1938 | Box 132 \ 4 scan0162 | |
| Proposing an accelerated test method on a friction rig to evaluate materials for cylinder bore wear. | 19th Aug 1938 | Box 132 \ 4 scan0163 | |
| Letter to supplier Richard Klinger Ltd. regarding a weakness in cylinder head gaskets and requesting a modified design. | 24th Aug 1938 | Box 132 \ 4 scan0164 | |
| Letter from Richard Klinger Ltd regarding the supply of twelve cylinder head gaskets. | 26th Aug 1938 | Box 132 \ 4 scan0165 | |
| The last chassis produced with chilled bores and the material of the cylinder iron. | 27th May 1938 | Box 132 \ 4 scan0166 | |
| Official order for 12 modified cylinder head gaskets. | 30th Aug 1938 | Box 132 \ 4 scan0167 | |
| Proposed modifications to the Wraith III and Bentley III cylinder block to assist the foundry. | 1st Sep 1938 | Box 132 \ 4 scan0168 | |
| Casting of water jackets and the potential deletion of tie-bars for certain models. | 1st Sep 1938 | Box 132 \ 4 scan0169 | |
| Proposed modifications to the Wraith cylinder block to facilitate casting and reduce factory costs. | 7th Sep 1938 | Box 132 \ 4 scan0170 | |
| To the Iron Foundry requesting cast samples for cylinder material friction tests. | 7th Sep 1938 | Box 132 \ 4 scan0171 | |
| Letter to Richard Klinger Ltd. about performance issues with Klingerit washers and requesting alternative material suggestions. | 9th Sep 1938 | Box 132 \ 4 scan0172 | |
| Research into alloy cast iron cylinder bore wear, detailing new liner compositions and requesting hardness tests. | 9th Sep 1938 | Box 132 \ 4 scan0173 | |
| Letter from a supplier discussing a problem with flaking washers and suggesting a new material. | 12th Sep 1938 | Box 132 \ 4 scan0174 | |
| Testing of nickel molybdenum and nickel chrome molybdenum alloys to address cylinder head seat cracking and cylinder bore wear. | 6th Oct 1938 | Box 132 \ 4 scan0175 | |
| Casting of cylinder heads and blocks in special alloys for trial on Wraith and Bentley cars. | 12th Oct 1938 | Box 132 \ 4 scan0176 | |
| Modifications to the coring of cylinder blocks for the Wraith model, proposing experimental testing before standardisation. | 21th Oct 1938 | Box 132 \ 4 scan0177 | |
| Requesting analysis of two cylinder heads that showed different results during valve seat cracking tests. | 26th Oct 1938 | Box 132 \ 4 scan0178 | |
| Dispatch request for 9 sample rings of cylinder material to Squadron Leader Helmore in Cambridge. | 28th Oct 1938 | Box 132 \ 4 scan0179 | |
| Letter from the Experimental Department regarding the dispatch of nine rings from cylinder liners for corrosion testing. | 28th Oct 1938 | Box 132 \ 4 scan0180 | |
| Letter from the Engineering Laboratory in Cambridge proposing a testing procedure for the corrosion resistance of nine cylinder liner samples. | 7th Nov 1938 | Box 132 \ 4 scan0181 | |
| Page two of a letter from the Engineering Laboratory, Cambridge, regarding a new Y alloy rotor cast and a report for the A.R.C. | 7th Nov 1938 | Box 132 \ 4 scan0182 | |
| Letter to Wing Comndr. Helmore suggesting the use of O2 to accelerate tests and to get a new Y alloy rotor made locally. | 11th Nov 1938 | Box 132 \ 4 scan0183 | |
| Order for Klingerit cylinder head gaskets and a quotation for production quantities. | 22th Nov 1938 | Box 132 \ 4 scan0184 | |
| Letter from Richard Klinger Ltd. discussing changing the hole dimensions for joints to overcome production difficulties. | 1st Dec 1938 | Box 132 \ 4 scan0185 | |
| Production implementation of the Klingerit 1000 cylinder head gasket. | 7th Dec 1938 | Box 132 \ 4 scan0186 | |
| Request to modify the B.60 & B.80 Klingerit cylinder head joints by increasing hole sizes and adding extra holes. | 7th Dec 1938 | Box 132 \ 4 scan0187 | |
| Confirming instructions to Rd. Klinger Ltd. to proceed with Cylinder Head Gaskets. | 20th Dec 1938 | Box 132 \ 4 scan0188 | |
| Standardisation of a Klingerit cylinder head joint for the 'C' series Wraith. | 21th Dec 1938 | Box 132 \ 4 scan0189 | |
| Outlining the testing procedure for comparing Delco and Rolls-Royce distributors. | 4th Jan 1939 | Box 132 \ 4 scan0190 | |
| Letter to the British Piston Ring Co. regarding the withdrawal of pressed-in exhaust valve seats from an experimental engine. | 12th Jan 1939 | Box 132 \ 4 scan0191 | |
| Alteration to the cylinder head gasket drawing EW.1933. | 13th Jan 1939 | Box 132 \ 4 scan0192 | |
| Letter from Richard Klinger Ltd. discussing issues and proposed modifications for cylinder head gaskets. | 19th Jan 1939 | Box 132 \ 4 scan0193 | |
| Copy of a letter from Wilmot Breeden Ltd. concerning the dimensions and suitability of Oscillith bushes. | 24th Jan 1939 | Box 132 \ 4 scan0194 | |
| Unsuitability of newly supplied gaskets for existing cylinder block castings, necessitating a re-order of the old type joint. | 2nd Feb 1939 | Box 132 \ 4 scan0195 | |
| Letter to a supplier regarding the unsatisfactory performance of special gaskets on a single-cylinder test unit. | 10th Feb 1939 | Box 132 \ 4 scan0196 | |
| Recommending the adoption of 'Klinger Black' rocker cover joints for the Phantom III due to superior performance and lower cost. | 11th Feb 1939 | Box 132 \ 4 scan0197 | |
| Letter from Richard Klinger Ltd. acknowledging a letter and arranging a visit from Mr. Horton. | 17th Feb 1939 | Box 132 \ 4 scan0198 | |
| Urgent internal memo to order 3-ply Corrujoint gaskets from The Southwark Manufacturing Co., Ltd. | 18th Feb 1939 | Box 132 \ 4 scan0199 | |
| Letter from the Experimental Department following up on corrosion and wear tests being conducted by the Engineering Laboratory in Cambridge. | 21th Feb 1939 | Box 132 \ 4 scan0200 | |
| Electric furnace produced 'Nickel Chrome Molybdenum' cylinder liners sent to the Experimental Department. | 29th Apr 1939 | Box 132 \ 4 scan0201 | |
| Authorisation for an order to Ley's Malleable Castings Co., Ltd. for electric furnace produced Nickel Chrome Molybdenum cylinder liners. | 4th May 1939 | Box 132 \ 4 scan0202 | |
| Request to place an official order with Messrs. Ley's Malleable Castings for an electric furnace melt and casting work. | 4th May 1939 | Box 132 \ 4 scan0203 | |
| Instructions for fitting special cylinder blocks with short liner inserts to cars WXA.1 and WXA.2. | 12th May 1939 | Box 132 \ 4 scan0204 | |
| Follow-up letter to the Cambridge Engineering Laboratory regarding the testing of sample rings of cylinder material. | 17th May 1939 | Box 132 \ 4 scan0205 | |
| Letter from the Engineering Laboratory in Cambridge regarding the completion of 360-hour cylinder corrosion tests. | 24th May 1939 | Box 132 \ 4 scan0206 | |
| Letter to Commander W. Helmore concerning Cylinder Corrosion Tests. | 31th May 1939 | Box 132 \ 4 scan0207 | |
| Requesting the production of six new cylinder liner castings in Rhosphor Chrome to replace a lost batch. | 7th Jun 1939 | Box 132 \ 4 scan0208 | |
| Letter from the Engineering Laboratory in Cambridge to W.A. Robotham regarding cylinder corrosion tests. | 19th Jun 1939 | Box 132 \ 4 scan0209 | |
| Report from Cambridge University Engineering Laboratory on experiments into the corrosive wear of cylinder steels over 360 hours. | 28th Oct 1938 | Box 132 \ 4 scan0210 | |
| Test report for a fluid wear apparatus, detailing the weight loss of a ring specimen over several days. | 20th Feb 1939 | Box 132 \ 4 scan0211 | |
| Test results from a fluid wear apparatus on a specimen ring, measuring weight loss over time. | 4th Mar 1939 | Box 132 \ 4 scan0212 | |
| Letter discussing a report on corrosion tests, cylinder bore wear, and a proposed meeting in Cambridge. | 24th Jun 1939 | Box 132 \ 4 scan0213 | |
| Telegram from Helmore to W. A. Robotham arranging a meeting at the engineering laboratory. | 26th Jul 1939 | Box 132 \ 4 scan0214 | |
| To Mr. Aspley regarding a trial of chromium plating on second-hand cylinder blocks. | 29th Jun 1939 | Box 132 \ 4 scan0215 | |
| Letter to Commander W. Helmore regarding a recent visit and the potential provision of a loose liner engine. | 29th Jun 1939 | Box 132 \ 4 scan0216 | |
| Letter from the Cambridge Engineering Laboratory regarding engine testing, material treatments, and a proposed meeting. | 5th Jul 1939 | Box 132 \ 4 scan0217 | |
| Letter to Wing Commander Helmore acknowledging his letter and advising of a delayed response from Mr. Robotham. | 6th Jul 1939 | Box 132 \ 4 scan0218 | |
| Urgent memo requesting the immediate order of 3 ply Corrujoint Gaskets. | 12th Jul 1939 | Box 132 \ 4 scan0219 | |
| Letter from Enwood Steel Products Ltd. proposing a meeting to discuss Loded Iron Cylinder Liners. | 1st Aug 1939 | Box 132 \ 4 scan0220 | |
| Letter to Mr. J.W. Newton of Enwood Steel Products Ltd. postponing a meeting date. | 2nd Aug 1939 | Box 132 \ 4 scan0221 | |
| Proposal to trial Olive joints on gallery pipes as a cost-saving replacement for brazed joints. | 2nd Aug 1939 | Box 132 \ 4 scan0222 | |
| Instructing that equipment for chromium plating cylinder blocks not be scrapped and be kept for use after the conclusion of hostilities. | 18th Sep 1939 | Box 132 \ 4 scan0223 | |
| The investigation and redesign of high power cylinder heads to improve performance. | 12th Oct 1939 | Box 132 \ 4 scan0224 | |
| Comparison of modifications and performance characteristics of various cylinder head designs. | 12th Oct 1939 | Box 132 \ 4 scan0225 | |
| Development and testing of the EXS.1383 cylinder head through various modifications. | 12th Oct 1939 | Box 132 \ 4 scan0226 | |
| Blueprint showing three modifications to a component, detailing changes to recesses, throat, and a turbulent lip. | 26th May 1939 | Box 132 \ 4 scan0227 | |
| Graph comparing the performance of different B.60 cylinder head configurations and ignition advance. | 26th May 1939 | Box 132 \ 4 scan0228 | |
| Performance comparison graph for a B.60 No. 3 unit 6-cylinder head. | 26th May 1939 | Box 132 \ 4 scan0229 | |
| Performance graph comparing different cylinder head and exhaust system configurations for a B.60 No.3 unit. | 25th Oct 1939 | Box 132 \ 4 scan0230 | |
| Revival and development of a flat 12-cylinder engine for commercial vehicles and rail-cars. | 25th Oct 1939 | Box 132 \ 4 scan0231 | |
| Short chromium plating some cylinder bores to compare wear against normal cast iron. | 23th Jan 1940 | Box 132 \ 4 scan0232 | |
| Issues and recommended procedures for chromium plating car cylinder bores. | 22th Jan 1940 | Box 132 \ 4 scan0233 | |
| New drawing for a Cylinder Head with a 3 1/2' bore and a 6.5 to 1 compression ratio. | 6th Feb 1940 | Box 132 \ 4 scan0234 | |
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