| Description | Date | Identifier | |
| Instructions regarding an experiment on new valve seats for a Phantom III chassis cylinder. | 22th Oct 1937 | Box 93 \ 4 scan0127 | |
| Complete set of Phantom III Connecting Rods sent to the Paris Depot for a trials car. | 30th Oct 1937 | Box 93 \ 4 scan0128 | |
| Request to machine Phosphor-Chrome cylinder liners for the Ph.III drawing for fitting in a No.14 unit. | 2nd Nov 1937 | Box 93 \ 4 scan0129 | |
| Note to Mr. Vickers of the Iron Foundry confirming an agreement to supply 16 cylinder liners for the Phantom III. | 10th Nov 1937 | Box 93 \ 4 scan0130 | |
| Requesting the inclusion of an asbestos valve grummet for the Phantom III 4 port cylinder head. | 18th Dec 1937 | Box 93 \ 4 scan0131 | |
| Laboratory results for centrifugally cast Phantom III cylinder liners with a higher phosphorous content. | 7th Feb 1938 | Box 93 \ 4 scan0132 | |
| Laboratory report on the analysis of a cast iron cylinder liner, showing micrographs, chemical composition, and hardness. | 5th Feb 1938 | Box 93 \ 4 scan0133 | |
| Water leaks from the Phantom III cylinder head gasket and proposed solutions. | 12th May 1938 | Box 93 \ 4 scan0134 | |
| Testing of Phantom III cylinder liners made from 'High Phosphorous iron' against standard Sheepbridge liners. | 13th May 1938 | Box 93 \ 4 scan0135 | |
| Production and testing of special Phantom III cylinder liners made from high phosphorous iron. | 30th May 1938 | Box 93 \ 4 scan0136 | |
| The Spectre Camshaft and Valve Springs, detailing changes to the tappet radius and valve lift curves. | 29th Mar 1934 | Box 93 \ 5 scan0001 | |
| Timing and design of the Spectre Camshaft. | 11th Jun 1934 | Box 93 \ 5 scan0002 | |
| Request to manufacture a new camshaft for the Spectre engine with specific modifications to improve slow running. | 11th Jun 1934 | Box 93 \ 5 scan0003 | |
| Note on camshaft toe measurements for the Spectre project, indicating deviations from the drawing are sufficient to cause noise. | 9th Jul 1934 | Box 93 \ 5 scan0004 | |
| Test bed results and manufacturing inaccuracies of a Spectre Camshaft. | 9th Jul 1934 | Box 93 \ 5 scan0005 | |
| Specification sheet for Spectre engine valve timings. | 4th Jul 1934 | Box 93 \ 5 scan0006 | |
| Inlet and exhaust valve lift curve for a Spectre short duration camshaft. | 27th Sep 1934 | Box 93 \ 5 scan0007 | |
| Graph comparing valve overlap with correct timing positions for various engines. | 1st Oct 1934 | Box 93 \ 5 scan0008 | |
| New Spectre camshaft design with negative overlap and specific timing. | 1st Oct 1934 | Box 93 \ 5 scan0009 | |
| Spectre camshaft design, comparing it with Cadillac, Bentley and 20/25 camshafts. | 3rd Oct 1934 | Box 93 \ 5 scan0010 | |
| Graph comparing the Brake Mean Effective Pressure curves for various Cadillac, Bentley, and 20/25 R.R engines. | 13th Feb 1935 | Box 93 \ 5 scan0011 | |
| Performance graph comparing different camshaft configurations for the Spectre engine with an open exhaust and 6:1 compression ratio. | 13th Feb 1935 | Box 93 \ 5 scan0012 | |
| Request for a new Spectre camshaft with two keyways to achieve a more advanced timing. | 9th Feb 1935 | Box 93 \ 5 scan0013 | |
| Specifications for the Spectre engine camshaft, including timing diagram and part numbers. | 2nd Mar 1935 | Box 93 \ 5 scan0014 | |
| Dissatisfaction with the slow running on the Spectre camshaft and the intention to trial a modified version. | 11th Mar 1935 | Box 93 \ 5 scan0015 | |
| Specifications for the Spectre Camshaft, detailing cam forms, angle, and timing. | 11th Mar 1935 | Box 93 \ 5 scan0016 | |
| Data table for the Spectre Cam Form, detailing Cam Lift for Valve Closing at different divisions. | 29th Apr 1935 | Box 93 \ 5 scan0017 | |
| Testing a camshaft on Spectre 2 and requesting another be prepared for unit No.5. | 29th Apr 1935 | Box 93 \ 5 scan0018 | |
| Instructions to fit a camshaft and cylinder heads to Spectre No.5 unit for testing prior to fitting roller tappets. | 15th May 1935 | Box 93 \ 5 scan0019 | |
| Proposed modification to the Spectre engine's valve gear oil circulation system. | 28th May 1935 | Box 93 \ 5 scan0020 | |
| With a drawing, specifying an additional lubrication hole drilling for the Spectre Camshaft. | 30th May 1935 | Box 93 \ 5 scan0021 | |
| Design compromise for the Spectre Camshaft (EX.18044) and its proposed use in experimental cars. | 6th Aug 1935 | Box 93 \ 5 scan0022 | |
| Modifications to a Spectre Camshaft form. | 5th Aug 1935 | Box 93 \ 5 scan0023 | |
| Specifications for the Spectre Camshaft, including cam forms, angle, and timing. | 5th Aug 1935 | Box 93 \ 5 scan0024 | |
| Data table for the Spectre Cam Form, detailing the cam lift for valve closing. | 7th Oct 1935 | Box 93 \ 5 scan0025 | |
| Request to manufacture a modified Phantom III camshaft to reduce valve seating noise. | 7th Oct 1935 | Box 93 \ 5 scan0026 | |
| Cancelling the instruction to make a long closing toe Ph.III camshaft. | 30th Oct 1935 | Box 93 \ 5 scan0027 | |
| Potential cracks in Phantom III marine type connecting rods and a proposed strengthening solution. | 9th Jan 1936 | Box 93 \ 5 scan0028 | |
| Request to manufacture a Phantom III camshaft with long toes to test dispensing with silent tappets. | 11th Jan 1936 | Box 93 \ 5 scan0029 | |
| Instructions for testing and fitting the Rm.44 camshaft, designed to delete the use of silent tappets. | 21th Mar 1936 | Box 93 \ 5 scan0030 | |
| Urgent memo regarding a modified cam form for the Phantom III, and instructions to the Churchill Machine Company. | 9th Oct 1936 | Box 93 \ 5 scan0031 | |
| Letter to Churchill Machine Tool Co. Ltd. requesting a quotation for a master cam to produce an experimental camshaft. | 5th Oct 1936 | Box 93 \ 5 scan0032 | |
| Quotation from Churchill Machine Tool Co+ for a Double Master Cam and Special Index Plate for a Cam Grinding Machine. | 7th Oct 1936 | Box 93 \ 5 scan0033 | |
| Experiment for a Phantom III camshaft with a reduced base circle to lower rubbing velocity. | 14th Oct 1936 | Box 93 \ 5 scan0034 | |
| Modifications to the Phantom III Camshaft and Bottom Tappets to reduce cost and improve design. | 10th Nov 1936 | Box 93 \ 5 scan0035 | |
| Brief note on investigations into valve spring materials, specifically hard-drawn piano wire and carbon steel wire. | 12th Nov 1936 | Box 93 \ 5 scan0036 | |
| Technical memorandum discussing the properties and use of different valve spring materials. | 12th Nov 1936 | Box 93 \ 5 scan0037 | |
| Technical memorandum discussing the production of heat-treatable carbon steel and carbon steel wire for springs. | 19th Nov 1936 | Box 93 \ 5 scan0038 | |
| Modifications to the Phantom III camshaft to improve low-speed M.E.P. | 19th Nov 1936 | Box 93 \ 5 scan0039 | |
| On the investigation of Phantom III roller tappets and the design of a new cam form. | 24th Nov 1936 | Box 93 \ 5 scan0040 | |
| Notice regarding the supply of hardened and tempered valve spring wire from a Swedish manufacturer for experimental tests. | 26th Nov 1936 | Box 93 \ 5 scan0041 | |
| Short duration camshaft with large tappet clearances for the Phantom III engine. | 4th Dec 1936 | Box 93 \ 5 scan0042 | |
| Cracking issues found in camshafts made from low carbon case hardening mild steel (UBAS type) after grinding. | 23th Jul 1937 | Box 93 \ 5 scan0043 | |
| The testing of long toe camshafts with large tappet clearances for Phantom III and Wraith III models. | 23th Apr 1937 | Box 93 \ 5 scan0044 | |
| Enquiry to The Midland Motor Cylinder Co. about the experimental cost for a 12-cylinder engine camshaft casting. | 18th Nov 1937 | Box 93 \ 5 scan0045 | |
| Promotional leaflet and material specification for 'MONIKROM' moulded camshafts by The Midland Motor Cylinder Co. Ltd. | 18th Nov 1937 | Box 93 \ 5 scan0046 | |
| Promotional document detailing the features and benefits of 'MONIKROM' moulded camshafts. | 19th Nov 1937 | Box 93 \ 5 scan0047 | |
| Letter from Midland Motor Cylinder Co Ltd acknowledging an enquiry about a 'Monikrom' material camshaft for a 12-Cylinder Car Engine. | 19th Nov 1937 | Box 93 \ 5 scan0048 | |
| Quotation from The Midland Motor Cylinder Co. Ltd for casting camshafts for a 12-cylinder car engine. | 26th Nov 1937 | Box 93 \ 5 scan0049 | |
| Quotation document from The Midland Motor Cylinder Co. Ltd. outlining the conditions of sale for unmachined castings. | 28th Sep 1936 | Box 93 \ 5 scan0050 | |
| Letter to The Midland Motor Cylinder Co. requesting a price for supplying 200 camshafts. | 27th Nov 1937 | Box 93 \ 5 scan0051 | |
| Quotation letter for camshaft castings from The Midland Motor Cylinder Co. Ltd. | 1st Dec 1937 | Box 93 \ 5 scan0052 | |
| Letter to The Midland Motor Cylinder Co. Ltd. regarding the price of a camshaft. | 2nd Dec 1937 | Box 93 \ 5 scan0053 | |
| Letter from the Midland Motor Cylinder Co. Ltd regarding missing drawings for a 4.5 litre camshaft and clarifying their process for quoting production castings. | 7th Dec 1937 | Box 93 \ 5 scan0054 | |
| Letter from a supplier discussing camshaft pricing, materials, and wear resistance. | 7th Dec 1937 | Box 93 \ 5 scan0055 | |
| Suggested modification to a camshaft, showing a cross-section with dimensions. | 28th Nov 1936 | Box 93 \ 5 scan0056 | |
| Letter to The Midland Motor Cyl. Co. apologising for not sending a camshaft drawing (EB.1085), which is now enclosed, and requesting a quotation. | 9th Dec 1937 | Box 93 \ 5 scan0057 | |
| Letter from the Midland Motor Cylinder Co. Ltd. acknowledging receipt of a camshaft drawing and advising a quotation will follow. | 10th Dec 1937 | Box 93 \ 5 scan0058 | |
| Letter from the Midland Motor Cylinder Co. Ltd. expressing concerns about manufacturing a lightweight camshaft, EB.1085. | 15th Dec 1937 | Box 93 \ 5 scan0059 | |
| Letter from The Midland Motor Cylinder Co. Ltd. regarding a drawing modification. | 15th Dec 1937 | Box 93 \ 5 scan0060 | |
| Letter to The Midland Motor Cylinder Co. Ltd. agreeing to a tapped hole on drawing EB.2746 and requesting a quote for two experimental camshaft castings. | 20th Dec 1937 | Box 93 \ 5 scan0061 | |
| Proceeding with an experiment to test cast iron as a material for cams. | 29th Dec 1937 | Box 93 \ 5 scan0062 | |
| Proposing an experiment to test cast iron as a material for camshafts for the Wraith and Bentley III models. | 29th Dec 1937 | Box 93 \ 5 scan0063 | |
| Quotation from The Midland Motor Cylinder Co. Ltd for experimental camshaft castings and pattern equipment. | 23th Dec 1937 | Box 93 \ 5 scan0064 | |
| Letter to The Midland Motor Cylinder Co. regarding a change of order for experimental camshafts from part EB.1085 to EW.1416. | 31th Dec 1937 | Box 93 \ 5 scan0065 | |
| Letter from a supplier discussing the design and manufacturing of experimental 'Monikrom' camshafts. | 3rd Jan 1938 | Box 93 \ 5 scan0066 | |
| Letter from The Midland Motor Cylinder Co. Ltd. regarding proceeding with pattern equipment and requesting a drawing. | 3rd Jan 1938 | Box 93 \ 5 scan0067 | |
| Letter to The Midland Motor Cyl. Co. regarding the manufacture of experimental camshafts. | 5th Jan 1938 | Box 93 \ 5 scan0068 | |
| Letter from Midland Motor Cylinder Co Ltd regarding the proposed cast form of an experimental 'Monikrom' camshaft. | 14th Jan 1938 | Box 93 \ 5 scan0069 | |
| Casting drawing of a camshaft, detailing the cam profile and machining allowances. | 12th Jan 1938 | Box 93 \ 5 scan0070 | |
| Letter to a supplier confirming machining allowances and inquiring about tappet material specifications. | 17th Jan 1938 | Box 93 \ 5 scan0071 | |
| Letter from The Midland Motor Cylinder Co. Ltd. regarding tappet materials suitable for use with Monikrom camshafts. | 20th Jan 1938 | Box 93 \ 5 scan0072 | |
| Letter from a supplier confirming the dispatch of three sample cast iron camshafts for inspection. | 11th Feb 1938 | Box 93 \ 5 scan0073 | |
| Follow-up letter from The Midland Motor Cylinder Co Ltd regarding a report on sample camshafts. | 22th Mar 1938 | Box 93 \ 5 scan0074 | |
| Letter to The Midland Motor Cylinder Co. regarding 3 sample camshafts made from 'Monikrom' material. | 23th Mar 1938 | Box 93 \ 5 scan0075 | |
| Policy document regarding the replacement of worn Phantom III camshafts with automatic tappets. | 24th Mar 1938 | Box 93 \ 5 scan0076 | |
| Letter to The Midland Motor Cylinder Co. regarding the testing of Monikrom camshafts and a new cast material for camwheels. | 24th May 1938 | Box 93 \ 5 scan0077 | |
| Letter from a supplier discussing the suitability of 'Monikrom' material for camshafts and gear wheels. | 26th May 1938 | Box 93 \ 5 scan0078 | |
| Letter to The Midland Motor Cylinder Co. regarding quotes for a cam wheel, camshaft, and pattern alteration. | 30th May 1938 | Box 93 \ 5 scan0079 | |
| Letter from Midland Motor Cylinder Co. Ltd. regarding a price quotation for Cam Wheel and Camshaft castings. | 31th May 1938 | Box 93 \ 5 scan0080 | |
| Testing 'Monikrome' cast iron camshafts for potential cost savings and improved performance. | 16th Jun 1938 | Box 93 \ 5 scan0081 | |
| Design drawing for a camshaft showing dimensions and cam positions. | 25th May 1938 | Box 93 \ 5 scan0082 | |
| Investigation design drawing for a camshaft gearwheel. | 17th Jun 1930 | Box 93 \ 5 scan0083 | |
| Agreement to produce in-house castings for 'Monikrome' camshafts and gears. | 25th Jun 1938 | Box 93 \ 5 scan0084 | |
| Instructing Walker to make patterns for a monichrome camwheel and camshaft. | 27th Jun 1938 | Box 93 \ 5 scan0085 | |
| Urging the completion of two experimental Monikrome camshafts and camwheels. | 7th Jul 1938 | Box 93 \ 5 scan0086 | |
| The heavy expenditure on replacing Tappets and Camshafts on Phantom III cars and requesting a test car for experimental solutions. | 21th Apr 1939 | Box 93 \ 5 scan0087 | |
| Offering a damaged Phantom III (chassis 6-AZ-124) for experiments with hydraulic tappets. | 24th Apr 1939 | Box 93 \ 5 scan0088 | |
| Work on Phantom III tappets and camshafts after accident repairs. | 26th Apr 1939 | Box 93 \ 5 scan0089 | |
| 'Spectre' engine's big end construction, comparing it with American designs. | 11th May 1933 | Box 93 \ 5 scan0090 | |
| | | | |
