| Description | Date | Identifier | |
| Comparison of the advantages of hairpin type valve springs versus helical type springs. | 30th Mar 1939 | Box 158 \ 5 scan0030 | |
| The despatch of a valve spring sample for inspection. | 20th Apr 1939 | Box 158 \ 5 scan0031 | |
| Letter concerning the dispatch of a sample shot blasted valve spring. | 20th Apr 1939 | Box 158 \ 5 scan0032 | |
| Article detailing the characteristics and operation of magnetically actuated spray valves for fuel injection systems. | 22th Apr 1939 | Box 158 \ 5 scan0033 | |
| The facilities and research projects at the N.Y.U. Aero Laboratories, including its wind tunnel and towing basin. | 22th Apr 1939 | Box 158 \ 5 scan0034 | |
| Technical article detailing the design and operation of an actuated fuel injection valve and its associated systems. | 22th Apr 1939 | Box 158 \ 5 scan0035 | |
| Technical analysis of the electrical circuit for a magnetic injection valve, with related graphs and equations. | 22th Apr 1939 | Box 158 \ 5 scan0036 | |
| Analysis of a magnetic injection valve, including oscillograms of current and voltage. | 22th Apr 1939 | Box 158 \ 5 scan0037 | |
| Comparison of spray development from a magnetically actuated valve and a jerk-pump system. | 22th Apr 1939 | Box 158 \ 5 scan0038 | |
| Study on the performance and injection delay of a magnetic injection valve using three-dimensional graphs. | 22th Apr 1939 | Box 158 \ 5 scan0039 | |
| Page from a journal discussing magnetic injection valves and a new concealed hinge design for auto bodies. | 22th Apr 1939 | Box 158 \ 5 scan0040 | |
| The design and urgent testing of coolant jets for the exhaust valve seats on Wraith III and Bentley III models. | 26th Apr 1939 | Box 158 \ 5 scan0041 | |
| Tests to prevent oil leakage down valve stems using Neoprene sealing washers. | 15th May 1939 | Box 158 \ 5 scan0042 | |
| Alternative materials for a part and proposing that sealing washers be fitted to inlet valves only. | 15th May 1939 | Box 158 \ 5 scan0043 | |
| Proposed scheme to prevent oil from leaking down valve stems using a dome-shaped, soft aluminium washer. | 31th May 1939 | Box 158 \ 5 scan0044 | |
| Implementation of a new sealing washer feature for valve springs on various engine units. | 9th Jun 1939 | Box 158 \ 5 scan0045 | |
| Letter from The Tempered Spring Co. Ltd. regarding the supply of valve springs, noting a slight deviation from the specified drawings. | 27th Jul 1939 | Box 158 \ 5 scan0046 | |
| Trial of cheaper exhaust valves, their material composition, and a comparison with existing parts for B.60 & B.80 engines. | 12th Aug 1939 | Box 158 \ 5 scan0047 | |
| Performance and satisfactory testing of inlet valves produced by Motor Components Ltd. | 1st Sep 1939 | Box 158 \ 5 scan0048 | |
| The use of electrically upset intake valves and extruded exhaust valves for high power engine units. | 1st Sep 1939 | Box 158 \ 5 scan0049 | |
| Requesting 2 blueprints each for inner and outer valve spring drawings for the Experimental Garage. | 13th Jan 1940 | Box 158 \ 5 scan0050 | |
| Valve spring materials, testing procedures, and manufacturing processes for the Vulture engine. | 23th Jan 1940 | Box 158 \ 5 scan0051 | |
| Work-hardening, carbon steel wire, and the benefits of shot blasting to prevent decarburisation. | 23th Jan 1940 | Box 158 \ 5 scan0052 | |
| Cost comparison for different types of valve springs. | 24th Jan 1940 | Box 158 \ 5 scan0053 | |
| Reliability of valve springs after changing the material from Chrome Vanadium to Carbon Wire. | 24th Jan 1940 | Box 158 \ 5 scan0054 | |
| Letter from a consulting engineer enclosing a provisional patent specification and drawing. | 25th Jan 1940 | Box 158 \ 5 scan0055 | |
| Blueprint for a Buckley self-adjusting tappet. | 30th Jan 1940 | Box 158 \ 5 scan0056 | |
| Technical memorandum comparing the performance of Swedish carbon steel and Chrome Vanadium valve spring wire. | 30th Jan 1940 | Box 158 \ 5 scan0057 | |
| Failures and experiences with Swedish carbon steel wire in car and aero engine components. | 30th Jan 1940 | Box 158 \ 5 scan0058 | |
| Follow-up letter from A.B. Buckley regarding a provisional specification and blueprint for a self-adjusting tappet. | 8th Feb 1940 | Box 158 \ 5 scan0059 | |
| Letter to a consulting engineer regarding self-adjusting tappet work and research facilities. | 12th Feb 1940 | Box 158 \ 5 scan0060 | |
| Provisional specification detailing the defects of self-adjusting hydraulic tappets. | 1st Jan 1940 | Box 158 \ 5 scan0061 | |
| Weights of valve mechanism parts and load/stress data for inner and outer springs. | 15th Mar 1940 | Box 158 \ 5 scan0062 | |
| Camshaft EB.4105, valve lift specifications, and related drawings PD.281 and PD.223. | 15th Mar 1940 | Box 158 \ 5 scan0063 | |
| Blueprint showing a cross-section of an engine valve train assembly, including the camshaft, rocker arm, and cylinder head. | 25th Apr 1940 | Box 158 \ 5 scan0064 | |
| Notes from a visit to Cadillac discussing their shutters, radiator caps, and Morse chains. | 25th Apr 1940 | Box 158 \ 5 scan0065 | |
| Summary of observations on American car manufacturer's engine components and balancing techniques. | 25th Apr 1940 | Box 158 \ 5 scan0066 | |
| Report comparing bore wear and oil consumption between standard, nickel chroma, and porous iron bores. | 25th Apr 1940 | Box 158 \ 5 scan0067 | |
| Engine component wear and material selection, referencing Cadillac and Ford. | 25th Apr 1940 | Box 158 \ 5 scan0068 | |
| On competitor engine components, specifically Moraine Products bearings and 10 m/m spark plugs. | 25th Apr 1940 | Box 158 \ 5 scan0069 | |
| Ignition troubles, improvements in A.C. insulator materials, and spark plug developments. | 25th Apr 1940 | Box 158 \ 5 scan0070 | |
| Providing an estimated operational temperature range for a valve spring. | 9th May 1940 | Box 158 \ 5 scan0071 | |
| Suggestion to ascertain the temperature of valve springs during flight due to their cost and unreliability. | 13th May 1940 | Box 158 \ 5 scan0072 | |
| Letter from consulting engineer A.B. Buckley regarding research and experimental data for a Buckley Tappet Adjuster. | 26th Jul 1940 | Box 158 \ 5 scan0073 | |
| Letter detailing the performance characteristics and reliability of an automatic valve adjuster based on test results. | 30th Sep 1940 | Box 158 \ 5 scan0074 | |
| Confirming completion of instructions for a rationalised valve gear without grommets for the B.60 Ripplet. | 30th Sep 1940 | Box 158 \ 5 scan0075 | |
| Brochure cover for Zero-Lash Hydraulic Valve Lifters from Automotive Products Company Ltd. | 9th Oct 1940 | Box 158 \ 5 scan0076 | |
| Letter from Automotive Products Company Ltd regarding the testing, manufacturing, and pricing of ZERO-LASH Hydraulic Tappets. | 9th Oct 1940 | Box 158 \ 5 scan0077 | |
| Returning a leaflet on hydraulic tappets. | 11th Oct 1940 | Box 158 \ 5 scan0078 | |
| Letter to Leyland Motors regarding hydraulic tappets and a 12-cylinder crankshaft. | 4th Nov 1940 | Box 158 \ 5 scan0079 | |
| Letter discussing engine torsional vibrations and crankshaft performance in 6 and 12-cylinder engines. | 4th Nov 1940 | Box 158 \ 5 scan0080 | |
| Extract detailing the testing and performance of self-adjusting tappets for the Hs.1210 engine. | 25th Apr 1934 | Box 158 \ 5 scan0081 | |
| Ongoing tests on self-adjusting tappets, oil drainage, and different plunger types. | 4th Nov 1940 | Box 158 \ 5 scan0082 | |
| Previous work on hydraulic tappets, Leyland's interest, and potential patenting. | 4th Nov 1940 | Box 158 \ 5 scan0083 | |
| Promising hydraulic tappet design, its proposed road testing, and comparison with the Cadillac design. | 25th Apr 1934 | Box 158 \ 5 scan0084 | |
| Issues and proposed improvements for Ph.II self-adjusting direct-acting hydraulic tappets, focusing on air lock problems. | 25th Apr 1934 | Box 158 \ 5 scan0085 | |
| Technical report on the performance and testing of self-adjusting tappets and related valve train components. | 25th Apr 1934 | Box 158 \ 5 scan0086 | |
| The investigation and testing of different tappet arrangements for the Phantom engine. | 25th Apr 1934 | Box 158 \ 5 scan0087 | |
| Blueprint diagram for Moon-Auto Adjusting Tappets, Phantom II (Scheme 2). | 16th Nov 1933 | Box 158 \ 5 scan0088 | |
| Schematic for a Modu auto-adjusting tappet for the Phantom II, scheme 3. | 16th Nov 1933 | Box 158 \ 5 scan0089 | |
| Blueprint for a modification to auto-adjusting tappets for the Phantom II, Scheme 1. | 18th Apr 1934 | Box 158 \ 5 scan0090 | |
| Blueprint of a self-adjusting tappet for Bentley and 25HP models. | 18th Apr 1934 | Box 158 \ 5 scan0091 | |
| Specifying that 45% of the hollow headed valves should be filled with sodium. | 5th Nov 1940 | Box 158 \ 5 scan0092 | |
| That hollow headed valves should be 45% filled with sodium. | 5th Nov 1940 | Box 158 \ 5 scan0093 | |
| Letter to Vauxhall Motors regarding production capacity for lead bronze bearings. | 5th Nov 1940 | Box 158 \ 5 scan0094 | |
| Letter from Vauxhall Motors regarding sodium amounts for valves and sourcing engine bearings. | 28th Oct 1940 | Box 158 \ 5 scan0095 | |
| Letter to Motor Components (Brm.) Ltd. requesting production of a dozen exhaust valves. | 12th Nov 1940 | Box 158 \ 5 scan0096 | |
| Requesting design modifications and drawings for Merlin engine connecting rods, a hydraulic tappet, and a die-cast piston. | 13th Nov 1940 | Box 158 \ 5 scan0097 | |
| Letter to Rotol Airscrews Ltd. inquiring about the status and configuration of a previously supplied Phantom II engine. | 19th Nov 1940 | Box 158 \ 5 scan0098 | |
| Letter from the Experimental Department inquiring about the status of valve forgings sent for machining. | 20th Nov 1940 | Box 158 \ 5 scan0099 | |
| Analysis of masked inlet valve timings and camshaft configurations to improve engine idling performance. | 13th Nov 1940 | Box 158 \ 5 scan0100 | |
| Increase of seat width and phasing cams to improve idling. | 13th Nov 1940 | Box 158 \ 5 scan0101 | |
| Letter from a supplier regarding valves damaged during an air raid. | 26th Nov 1940 | Box 158 \ 5 scan0102 | |
| Letter responding to a suggestion for a rotary valve, comparing it to existing poppet valves. | 30th Dec 1940 | Box 158 \ 5 scan0103 | |
| Letter with suggestions for improving engine valve design and materials. | 25th Dec 1940 | Box 158 \ 5 scan0104 | |
| Letter discussing case hardening steel and the effects of different fuels like Benzol and Ethyl on engine valves. | 25th Dec 1940 | Box 158 \ 5 scan0105 | |
| Hand-drawn sketches illustrating engine inlet and exhaust valve mechanisms. | 25th Dec 1940 | Box 158 \ 5 scan0106 | |
| To Miss Taylor requesting a record adjustment due to a pricing error on an invoice for machined exhaust valves. | 27th Feb 1941 | Box 158 \ 5 scan0107 | |
| Standard 8 valve timing specifications for inlet and exhaust valves, and valve springs. | 13th Mar 1941 | Box 158 \ 5 scan0108 | |
| Querying calculations for Merlin inlet valve acceleration, valve bounce, and the necessity of chromium plating for rockers on Merlin and Kestrel engines. | 25th May 1941 | Box 158 \ 5 scan0109 | |
| Report discussing the causes and potential solutions for valve spring surge in different engine configurations. | 5th Jul 1941 | Box 158 \ 5 scan0110 | |
| Letter regarding patent ventilators and forwarding a photograph of Lichfield Cathedral. | 22th Feb 1938 | Box 158 \ 6 scan0001 | |
| Promotional leaflet for the 'M.M.' Draughtless Ventilator, detailing its features, benefits, and expert reviews. | 22th Feb 1938 | Box 158 \ 6 scan0002 | |
| Letter to C. H. Gardner suggesting a trial of a new patented draughtless ventilation system for Mr. W. A. Robotham. | 22th Feb 1938 | Box 158 \ 6 scan0003 | |
| Letter to Messrs. Mead, Mc.Lean & Co. Ltd. enclosing a blueprint for an O.S. front door. | 15th Mar 1938 | Box 158 \ 6 scan0004 | |
| Letter providing maximum width measurements of a car body to Messrs. Mead Mc. Lean & Co. Ltd. | 16th Mar 1938 | Box 158 \ 6 scan0005 | |
| Request to despatch four pieces of safety glass with wooden templates to Messrs. Mead Mc.Lean & Co.Ltd. | 4th Apr 1938 | Box 158 \ 6 scan0006 | |
| Letter confirming the dispatch of safety glass cut to templates to Messrs. Mead Mc. Lean & Co. Ltd. | 4th Apr 1938 | Box 158 \ 6 scan0007 | |
| Letter chasing the delivery of ventilators and urgently requesting a second set for testing on a car body. | 21th Apr 1938 | Box 158 \ 6 scan0008 | |
| Letter to Messrs. Mead Mc.Lean & Co. Ltd. regarding blueprints and wooden patterns for ventilators. | 25th Apr 1938 | Box 158 \ 6 scan0009 | |
| Letter to a supplier requesting the urgent supply of diffuse strips to complete testing on fitted ventilators. | 29th Apr 1938 | Box 158 \ 6 scan0010 | |
| Dispatch of 4 pieces of safety glass to Messrs. Mead Mc. Lean & Co. Ltd. | 4th May 1938 | Box 158 \ 6 scan0011 | |
| Letter to Messrs. Mead Mc. Lean & Co.Ltd. arranging for a representative to test the first set of ventilators. | 7th May 1938 | Box 158 \ 6 scan0012 | |
| Letter to Messrs. Mead Mc.Lean & Co. Ltd. regarding wind noise from ventilators and arranging a demonstration. | 19th May 1938 | Box 158 \ 6 scan0013 | |
| Potential fume entry and drowsiness caused by Mead ventilators in a 25/30 car. | 9th Jun 1938 | Box 158 \ 6 scan0014 | |
| Head ventilation tests measuring temperatures in response to a query about fumes entering the car body. | 14th Jun 1938 | Box 158 \ 6 scan0015 | |
| Analysis of engine heat versus fumes noticed when driving with the front windows down. | 14th Jun 1938 | Box 158 \ 6 scan0016 | |
| Requesting the fitment of a 'No-draught' ventilation scheme on B.III. | 2nd Aug 1938 | Box 158 \ 6 scan0017 | |
| Correspondence to Mead McLean & Co. Ltd. regarding a Bentley O.S. front door blueprint and draught ventilators. | 8th Aug 1938 | Box 158 \ 6 scan0018 | |
| Letter from Mead McLean & Co Ltd regarding an order for 'M.M' Patent Draughtless Ventilators. | 9th Aug 1938 | Box 158 \ 6 scan0019 | |
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