| Description | Date | Identifier | |
| Thank you letter to Mr. Robinson of The Associated Equipment Co. Ltd. for his hospitality and information during a works visit. | 1st Mar 1939 | Box 133 \ 3 scan0048 | |
| Thank you letter to O. Thornycroft of Messrs. Ricardo for hospitality and information during a works visit. | 1st Mar 1939 | Box 133 \ 3 scan0049 | |
| The unsuitable installation of a 4-stroke diesel engine at a Technical College, noting severe vibration issues. | 2nd Mar 1939 | Box 133 \ 3 scan0050 | |
| Summary of three different diesel engine cylinder head designs and their respective pros and cons. | 2nd Mar 1939 | Box 133 \ 3 scan0051 | |
| Proposal to concentrate design efforts on single-cylinder units for application to a main engine. | 2nd Mar 1939 | Box 133 \ 3 scan0052 | |
| Performance comparison graph for three different diesel cylinder head types on a six-cylinder engine. | 2nd Apr 1937 | Box 133 \ 3 scan0053 | |
| Visit to Ricardo's to discuss compression ignition (diesel) engines, focusing on the characteristics of direct injection systems. | 3rd Mar 1939 | Box 133 \ 3 scan0054 | |
| Report page detailing the performance characteristics of an Ante-Chamber engine design. | 3rd Mar 1939 | Box 133 \ 3 scan0055 | |
| Engine design, focusing on swirl, volumetric efficiency, and supercharging in diesel engines. | 3rd Mar 1939 | Box 133 \ 3 scan0056 | |
| Review and comparison of fuel injection system designs and components for D.I combustion chambers. | 3rd Mar 1939 | Box 133 \ 3 scan0057 | |
| Pneumatic governors, piston and ring performance, and specifications of a blown Citroen diesel engine. | 3rd Mar 1939 | Box 133 \ 3 scan0058 | |
| The performance and design of various engine types, including two-stroke and diesel units. | 3rd Mar 1939 | Box 133 \ 3 scan0059 | |
| Summary of a second 100-hour contract running test on a 4-stroke diesel engine. | 6th Mar 1939 | Box 133 \ 3 scan0060 | |
| Summary of a 100-hour contract test on a 4-stroke compression ignition engine. | 6th Mar 1939 | Box 133 \ 3 scan0061 | |
| Test report detailing conclusions on fuel nozzles, cylinder performance, and general engine conditions. | 6th Mar 1939 | Box 133 \ 3 scan0062 | |
| Properties of airship diesel oils and subsequent tests on nozzle and piston development. | 6th Mar 1939 | Box 133 \ 3 scan0063 | |
| Comparison and analysis of different fuel injector and nozzle designs, including Bosch and R.A.E. types. | 6th Mar 1939 | Box 133 \ 3 scan0064 | |
| Engine development experiments concerning injectors, injection pumps, air swirl, and volumetric efficiency. | 6th Mar 1939 | Box 133 \ 3 scan0065 | |
| Various engine tests and modifications including injection timing, piston experiments, and cylinder modifications. | 6th Mar 1939 | Box 133 \ 3 scan0066 | |
| Engine power loss issues and various mechanical failures. | 6th Mar 1939 | Box 133 \ 3 scan0067 | |
| Table detailing standard engine performance metrics at various RPMs. | 6th Mar 1939 | Box 133 \ 3 scan0068 | |
| Summary of the running tests on a 4-stroke diesel engine, noting the programme is complete and the unit was changed to a two-stroke. | 8th Mar 1939 | Box 133 \ 3 scan0069 | |
| Summary of final running tests and development on a 4-stroke diesel unit, covering investigations into injector overheating and injection types. | 8th Mar 1939 | Box 133 \ 3 scan0070 | |
| Engine development tests for nozzles, valve sizes, and side injection configurations. | 8th Mar 1939 | Box 133 \ 3 scan0071 | |
| Side injection and combined pump and injector systems, detailing nozzle configurations and performance results. | 8th Mar 1939 | Box 133 \ 3 scan0072 | |
| Proposal to supply the 8-cylinder engine unit for marine purposes due to low sales for private cars. | 23th May 1939 | Box 133 \ 3 scan0073 | |
| Cover memo for an attached letter and sketch regarding a 3-cylinder 2-stroke C.I. engine. | 27th May 1939 | Box 133 \ 3 scan0074 | |
| Letter from Armstrong Whitworth discussing valve timing and characteristics for a 3-cylinder engine. | 25th May 1939 | Box 133 \ 3 scan0075 | |
| Letter discussing masked valves, inlet swirl, and turbulence for a combustion chamber. | 26th Jun 1939 | Box 133 \ 3 scan0076 | |
| Proposal to proceed with an 8-cylinder engine for marine purposes. | 26th Jun 1939 | Box 133 \ 3 scan0077 | |
| Visit from Engineer-Commander Grylls to discuss Admiralty requirements for marine units and gearboxes for Motor Torpedo Boats. | 27th Jun 1939 | Box 133 \ 3 scan0078 | |
| Supply of Marine Merlin and auxiliary engines for Admiralty M.T.B.s and other craft. | 10th Aug 1939 | Box 133 \ 3 scan0079 | |
| Machinery requirements and testing procedures for 1939 Motor Torpedo Boats (M.T.B's). | 10th Aug 1939 | Box 133 \ 3 scan0080 | |
| Procedures for power, silence, vibration, and sea trials for an engine. | 10th Aug 1939 | Box 133 \ 3 scan0081 | |
| Page of miscellaneous trial requirements and component specifications, including for a dynamo and bilge pump. | 10th Aug 1939 | Box 133 \ 3 scan0082 | |
| Auxiliary drive coupling, cruising engine, and gearbox requirements involving the Admiralty. | 11th Aug 1939 | Box 133 \ 3 scan0083 | |
| Internal memorandum discussing the design, auxiliaries, and trials for a marine 8-cylinder power plant. | 11th Aug 1939 | Box 133 \ 3 scan0084 | |
| Letter to Messrs. Modern Wheel Drive Ltd. enclosing blueprints for a motor boat engine to be fitted with a hydraulic coupling. | 14th Aug 1939 | Box 133 \ 3 scan0085 | |
| Performance of nine popular diesel engines for transport. | 14th Aug 1939 | Box 133 \ 3 scan0086 | |
| Comparative table of specifications for various manufacturers' engines. | 15th Sep 1939 | Box 133 \ 3 scan0087 | |
| Viability of using an 8-cylinder engine in Motor Torpedo Boats. | 15th Sep 1939 | Box 133 \ 3 scan0088 | |
| Visit to Vospers regarding their future requirements for 150 HP 8-cylinder engines for marine use in torpedo boats. | 19th Sep 1939 | Box 133 \ 3 scan0089 | |
| Letter to T.C. Worth of Harborough Aircraft Manufacturing Co. regarding a marine engine project, test bed filters, and the Merlin filter. | 29th Sep 1939 | Box 133 \ 3 scan0090 | |
| Requirements for marine engines from the perspective of a yacht owner or skipper. | 10th Jan 1940 | Box 133 \ 3 scan0091 | |
| Recommendations for marine engine auxiliaries, mounting, and gearing. | 10th Jan 1940 | Box 133 \ 3 scan0092 | |
| Charging rates and gearboxes for yacht electrical and propulsion systems. | 10th Jan 1940 | Box 133 \ 3 scan0093 | |
| Containing extracts from a letter discussing the market for marine engines. | 11th Jan 1940 | Box 133 \ 3 scan0094 | |
| Home diesel market, yachtsman preferences, and potential engine sales opportunities. | 11th Jan 1940 | Box 133 \ 3 scan0095 | |
| Competitive petrol marine engines and the requirements for converting engines for marine units. | 15th Jan 1940 | Box 133 \ 3 scan0096 | |
| List of design considerations for a twin-engine installation, including a layout sketch. | 15th Jan 1940 | Box 133 \ 3 scan0097 | |
| List of technical design considerations and requirements for an engine, likely for marine application. | 15th Jan 1940 | Box 133 \ 3 scan0098 | |
| Short note on the Perkins Diesel lorry engine specifications. | 15th Jan 1940 | Box 133 \ 3 scan0099 | |
| Comparison table of various manufacturers' 4-stroke petrol marine engines with their specifications. | 15th Jan 1940 | Box 133 \ 3 scan0100 | |
| Specification table comparing different engine makes such as Penta and Scripps. | 23th Jan 1940 | Box 133 \ 3 scan0101 | |
| Summary of the value of marine engines imported into Great Britain from various countries in 1938 and 1939. | 23th Jan 1940 | Box 133 \ 3 scan0102 | |
| Letter to The Zenith Carburetter Co. Ltd. requesting information on a duplex up-draught carburetter. | 1st Feb 1940 | Box 133 \ 3 scan0103 | |
| Minutes of a conference on a marine unit detailing various action points for component sourcing and development. | 1st Feb 1940 | Box 133 \ 3 scan0104 | |
| List of marine engine components and data wanted from various suppliers in the U.S.A. | 3rd Feb 1940 | Box 133 \ 3 scan0105 | |
| Marine engine development, including discussions with Parsons' Engineering Company about gearboxes and visits to yacht companies. | 3rd Feb 1940 | Box 133 \ 3 scan0106 | |
| Firm's use of American engines in cruisers and the potential for a trial of an English engine. | 5th Feb 1940 | Box 133 \ 3 scan0107 | |
| Letter from Zenith Carburetter Co. Ltd regarding the availability of Stromberg and Solex carburetters. | 5th Feb 1940 | Box 133 \ 3 scan0108 | |
| Letter from Zenith Carburetter Co. regarding the availability of twin updraught carburetters. | 5th Feb 1940 | Box 133 \ 3 scan0109 | |
| Letter regarding a drawing for a 40mm Twin Vertical Solex Carburetter and its maximum choke tube size. | 6th Feb 1940 | Box 133 \ 3 scan0110 | |
| Article detailing the features and specifications of the new R.N. Diesel Engine. | 6th Feb 1940 | Box 133 \ 3 scan0111 | |
| Article with schematics describing the horizontal diesel engines on the Voith-Schneider propelled ferry, 'Abercraig'. | 8th Apr 1940 | Box 133 \ 3 scan0112 | |
| Minutes of a conference discussing the conversion of an 8-cylinder petrol engine for marine use. | 8th Apr 1940 | Box 133 \ 3 scan0113 | |
| List of numbered design considerations and decisions for an engine and its components. | 8th Jan 1940 | Box 133 \ 3 scan0114 | |
| The requirements for a change over switch and an ignition switch. | 8th Jan 1940 | Box 133 \ 3 scan0115 | |
| Request to Mr. Turner of The Zenith Carburetter Co. Ltd. for a Stromberg carburetter model and drawings. | 9th Feb 1940 | Box 133 \ 3 scan0116 | |
| Letter from Zenith Carburetter Co. Ltd regarding the sourcing of a UU-3 carburetter and drawings from America. | 12th Feb 1940 | Box 133 \ 3 scan0117 | |
| Meeting with Walton Yacht Works regarding the supply of 6 & 8 cylinder marine engines for their express cruisers. | 13th Feb 1940 | Box 133 \ 3 scan0118 | |
| Article detailing new Kermath and Fairbanks-Morse marine engines for the 1940 model year. | 1st Jan 1940 | Box 133 \ 3 scan0119 | |
| Page from a publication detailing various marine engines for 1940 from manufacturers including Briggs & Stratton, Chris-Craft, and Scripps. | 1st Jan 1940 | Box 133 \ 3 scan0120 | |
| Article detailing new marine engines from Scripps and Chrysler, presented at the 1940 Motor Boat Show. | 1st Jan 1940 | Box 133 \ 3 scan0121 | |
| Page from a publication reviewing 1940 marine engines from manufacturers Sterling, Gray, Atlas Imperial, and Buda. | 1st Jan 1940 | Box 133 \ 3 scan0122 | |
| Page from a publication detailing various marine engines and their specifications from the 1940 show. | 1st Jan 1940 | Box 133 \ 3 scan0123 | |
| Magazine page detailing various marine engines, including models from Buda, Chrysler, and Chris-Craft, with their specifications and features. | 1st Jan 1940 | Box 133 \ 3 scan0124 | |
| Page from a publication detailing various marine diesel and petrol engines from multiple manufacturers. | 1st Jan 1940 | Box 133 \ 3 scan0125 | |
| Page from a publication detailing new marine diesel engines from various manufacturers for the 1940 Motor Boat Show. | 1st Jan 1940 | Box 133 \ 3 scan0126 | |
| New supercharged diesel engines and marine electric plants from various manufacturers. | 1st Jan 1940 | Box 133 \ 3 scan0127 | |
| New marine engines from Waukesha, Red Wing, and Arnolt, with images and specifications. | 1st Jan 1940 | Box 133 \ 3 scan0128 | |
| Article reviewing new Palmer Diesel engines and Universal Sea-Lion series marine engines. | 1st Jan 1940 | Box 133 \ 3 scan0129 | |
| Showcase of marine auxiliary units and engines from Reiner, Hall-Scott, and Red Wing. | 1st Jan 1940 | Box 133 \ 3 scan0130 | |
| Publication page detailing new marine engines and related products for the 1940 model year. | 1st Jan 1940 | Box 133 \ 3 scan0131 | |
| Parsons Marine Reverse Gears, including lubrication systems, gear sizes, and blueprints for B.60 and B.80 engines. | 16th Feb 1940 | Box 133 \ 3 scan0132 | |
| Listing various print and sheet numbers for the design of an H SIZE GEAR. | 16th Feb 1940 | Box 133 \ 3 scan0133 | |
| Letter from Zenith Carburetter Co. Ltd regarding the availability of a 48mm carburetter. | 29th Feb 1940 | Box 133 \ 3 scan0134 | |
| Enquiry to Zenith Carburetter Co. regarding the availability and forwarding of carburettors. | 1st Mar 1940 | Box 133 \ 3 scan0135 | |
| Letter from The Zenith Carburetter Co. Ltd. regarding the availability of carburettors. | 4th Mar 1940 | Box 133 \ 3 scan0136 | |
| Letter from The Zenith Carburetter Co. about the low demand for a specific vertical carburetter. | 4th Mar 1940 | Box 133 \ 3 scan0137 | |
| Development and market potential of petrol marine engines. | 5th Mar 1940 | Box 133 \ 3 scan0138 | |
| The increased import of American engines due to the war and the opportunity to supply marine units for Admiralty patrol boats. | 5th Mar 1940 | Box 133 \ 3 scan0139 | |
| Letter from The Zenith Carburetter Co. Ltd regarding difficulties sourcing twin updraught carburetters from the USA, likely for a marine engine. | 9th Mar 1940 | Box 133 \ 3 scan0140 | |
| Pricing petrol marine engines to compete against American engines. | 11th Mar 1940 | Box 133 \ 3 scan0141 | |
| Two American pamphlets on diesel engines in relation to projected 2-cycle work. | 12th Mar 1940 | Box 133 \ 3 scan0142 | |
| Creation of a proof booklet with illustrations to justify a recommended procedure. | 14th Mar 1940 | Box 133 \ 3 scan0143 | |
| Admiralty requirements for marine engines, including sump pumps, starter pinions, and belt drives. | 19th Mar 1940 | Box 133 \ 3 scan0144 | |
| Confirming Admiralty requirements for marine engines, discussing sump pumps, starter pinions, and belt drives. | 19th Mar 1940 | Box 133 \ 3 scan0145 | |
| Memo regarding a visit to 'Squash Court' detailing three points for discussion. | 29th Mar 1940 | Box 133 \ 3 scan0146 | |
| Letter from Armstrong Whitworth Securities to E.W. Hives regarding the development of a compression ignition engine. | 29th Mar 1940 | Box 133 \ 3 scan0147 | |
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