| Description | Date | Identifier | |
| Feasibility of meeting War Office requirements for an armoured car chassis, focusing on radiator capacity and performance tests. | 1st Aug 1921 | Box 180 \ M1 \ 6 img007 | |
| Suitability of a chassis for armoured car use, comparing it with commercial alternatives and addressing performance concerns. | 27th Aug 1921 | Box 180 \ M1 \ 6 img008 | |
| Experimental modification to improve the cooling system of a 40/50 HP armoured car. | 1st Aug 1921 | Box 180 \ M1 \ 6 img009 | |
| Modifications to the cooling system of the 40/50 Armoured Cars to address water loss. | 6th Dec 1921 | Box 180 \ M1 \ 6 img010 | |
| Continued discussion on the negative effects of lower water circulation speed and how contaminated water can cause priming. | 6th Dec 1921 | Box 180 \ M1 \ 6 img011 | |
| Suitability of a C.A.V. starter for a 30 HP 1906/7 chassis, number 60508. | 1st Aug 1921 | Box 180 \ M1 \ 6 img012 | |
| From 'R.' to 'HM.' discussing costs from C.A.V. and responsibility for a modification. | 9th Aug 1921 | Box 180 \ M1 \ 6 img013 | |
| Issues with sourcing materials such as thin paper and low hysteresis steel for condensers. | 21th Nov 1921 | Box 180 \ M1 \ 6 img014 | |
| The performance test of Melin tungsten contact points after a 390-hour run. | 19th Sep 1921 | Box 180 \ M1 \ 6 img015 | |
| The production plan for six experimental Goshawk 11 chassis. | 12th Sep 1921 | Box 180 \ M1 \ 6 img016 | |
| Policy for ordering materials for the Goshawk 11 chassis. | 14th Oct 1931 | Box 180 \ M1 \ 6 img017 | |
| Production and testing strategy for the Goshawk 11 car. | 14th Oct 1921 | Box 180 \ M1 \ 6 img018 | |
| Inter-departmental cooperation for the development and testing of a new small car, the Goshawk. | 14th Oct 1921 | Box 180 \ M1 \ 6 img019 | |
| Customer complaints regarding the springing of the 40/50 HP chassis, comparing thick and thin leaf springs. | 10th Nov 1921 | Box 180 \ M1 \ 6 img020 | |
| Vehicle springing issues, tyre pressure effects, and achieving ideal friction through lubrication and dampers. | 7th Oct 1921 | Box 180 \ M1 \ 6 img021 | |
| The challenges and considerations of fitting shock absorbers, including component modifications and customer feedback. | 7th Oct 1921 | Box 180 \ M1 \ 6 img022 | |
| Leaf spring friction, potential complaints, and solutions such as dampers, lubrication, or changing spring types. | 7th Oct 1921 | Box 180 \ M1 \ 6 img023 | |
| Cover note for a letter from the representative in India about the running of cars fitted only with battery ignition. | 6th Oct 1921 | Box 180 \ M1 \ 6 img024 | |
| Letter from the Delhi Service Depot outlining the reasons for prejudice against battery ignition cars in India. | 15th Sep 1921 | Box 180 \ M1 \ 6 img025 | |
| The impracticality of battery-only ignition systems due to a lack of charging facilities in 'Native States'. | 15th Sep 1921 | Box 180 \ M1 \ 6 img026 | |
| Modifications to fit a magneto on the Goshawk II engine by altering the starter motor position. | 1st Nov 1921 | Box 180 \ M1 \ 6 img027 | |
| Telegram from Royce to Hives regarding a meeting to discuss U.S.A. matters and the Goshawk engine. | 15th Jul 1930 | Box 180 \ M1 \ 6 img028 | |
| From Rs. to HS. arranging a meeting with Mr. Royce at West Wittering regarding 'Goshawk II'. | 18th Nov 1921 | Box 180 \ M1 \ 6 img029 | |
| Bump test failures of the Goshawk II chassis, with a comparison to the standard 40/50 HP chassis. | 15th Dec 1921 | Box 180 \ M1 \ 6 img030 | |
| Potential front spring failures on the Goshawk car, urging modifications before production. | 15th Dec 1921 | Box 180 \ M1 \ 6 img031 | |
| Log of breakages and remarks from a bump test on a Tomahawk chassis front. | 15th Dec 1921 | Box 180 \ M1 \ 6 img032 | |
| Test report on a front bumper chassis, detailing special fittings and a log of failures over time. | 15th Dec 1921 | Box 180 \ M1 \ 6 img033 | |
| Log of a running test on the rear of a 40/50 chassis, detailing failures over 100 hours. | 15th Dec 1921 | Box 180 \ M1 \ 6 img034 | |
| The performance of oilless bushes on a Marmon Car and a recommendation for their use on the 40/50 HP model. | 2nd Aug 1921 | Box 180 \ M1 \ 7 img001 | |
| The dismantling and analysis of a Marmon car crankshaft and bearings. | 1st Sep 1921 | Box 180 \ M1 \ 7 img002 | |
| Pin dimensions, Brinell hardness tests, and chemical analysis results. | 1st Sep 1921 | Box 180 \ M1 \ 7 img003 | |
| Extract from the Marmon Car Instruction Book detailing the function of the electrical circuit breaker. | 10th Dec 1920 | Box 180 \ M1 \ 7 img004 | |
| Analysis of a double circuit breaker from a Marmon car for use in a chassis electrical system. | 3rd Dec 1921 | Box 180 \ M1 \ 7 img005 | |
| Continuation page of a report on electrical circuit protection arrangements as an alternative to fuses. | 3rd Dec 1921 | Box 180 \ M1 \ 7 img006 | |
| Analysis of a circuit breaker and dynamo system under fault conditions, page 3. | 13th Dec 1921 | Box 180 \ M1 \ 7 img007 | |
| The examination and particulars of a 6-volt Marmon Delco Dynamo. | 28th Sep 1921 | Box 180 \ M1 \ 7 img008 | |
| Page 2 of a report detailing the performance and physical specifications of an electrical machine. | 28th Sep 1921 | Box 180 \ M1 \ 7 img009 | |
| Graph of ampere-output speed curves for a Delco Dynamo from a Marmon Car. | 19th Oct 1921 | Box 180 \ M1 \ 7 img010 | |
| The compression ratio and detonation issues of an Essex car engine. | 19th Oct 1921 | Box 180 \ M1 \ 7 img011 | |
| Comparison of a 15 HP Lorraine-Dietrich with the 'Goshawk II', listing its shortcomings. | 23th Nov 1921 | Box 180 \ M1 \ 7 img012 | |
| Recommendation to adopt the new Lucas Cut-out as standard based on its reliability and performance. | 7th Jul 1921 | Box 180 \ M1 \ 8 img001 | |
| Recommendation for the adoption of a new cut-out and further development with Lucas's. | 4th Jul 1921 | Box 180 \ M1 \ 8 img002 | |
| Unsatisfactory output of the Lucas Dynamo for the 40/50 chassis, comparing cutting-in speeds with different axle ratios. | 7th Jul 1921 | Box 180 \ M1 \ 8 img003 | |
| Axle ratios and their impact on dynamo cutting-in speeds for the 40/50 chassis. | 1st Jul 1921 | Box 180 \ M1 \ 8 img004 | |
| Dissatisfaction with the Lucas Company's electrical equipment and future contract terms. | 8th Jul 1921 | Box 180 \ M1 \ 8 img005 | |
| Reliability issues with dynamo, cut-out, and fuse components. | 1st Jul 1921 | Box 180 \ M1 \ 8 img006 | |
| Successfully resolving and standardising issues regarding Exide battery reliability and dynamo belt tension. | 1st Jul 1921 | Box 180 \ M1 \ 8 img007 | |
| Further notes discussing the unreliability of Lucas electrical equipment, dynamos, and potential replacement options. | 2nd Jul 1921 | Box 180 \ M1 \ 8 img008 | |
| Reliability of fuses and fuse holders, and questioning a committee decision. | 1st Jul 1921 | Box 180 \ M1 \ 8 img009 | |
| Difficulties and proposed design changes for petrol tank fittings in response to U.S.A. complaints. | 14th Jul 1921 | Box 180 \ M1 \ 8 img010 | |
| Letter discussing vacuum feed systems and a hot spot induction system for low-grade gasoline. | 1st Jul 1921 | Box 180 \ M1 \ 8 img011 | |
| Methods of heating the carburettor and throttle, including using exhaust gases and the implications for using alcohol as fuel. | 1st Jul 1921 | Box 180 \ M1 \ 8 img012 | |
| Starter carburettor, speedometer drive, chassis weight, and battery ignition. | 12th Jul 1921 | Box 180 \ M1 \ 8 img013 | |
| Comparison of platinum-iridium versus tungsten for use in contact points. | 1st Jul 1921 | Box 180 \ M1 \ 8 img014 | |
| Requesting a test of G.11 and Neptune induction pipes against the Dorris scheme on a 40/50 engine. | 15th Dec 1921 | Box 180 \ M1 \ 9 img001 | |
| Unsuitability of the Bendix pinion for the Neptune Electric Starter and proposing an alternative design. | 15th Dec 1921 | Box 180 \ M1 \ 9 img002 | |
| Modification of a 40/50 HP chassis engine for marine applications, to be named 'Neptune'. | 1st Oct 1921 | Box 180 \ M1 \ 9 img003 | |
| Listing drawings for the 'Goshawk II' and 'Swallow' designs being prepared for an upcoming meeting. | 8th Nov 1921 | Box 180 \ M1 \ 9 img004 | |
| Listing drawings related to the 'Swallow' Gear Box and Clutch. | 1st Nov 1921 | Box 180 \ M1 \ 9 img005 | |
| Drawings for the 'Swallow' Gear Box and Declutching Gear. | 1st Nov 1921 | Box 180 \ M1 \ 9 img006 | |
| Proposed visit and a plan to modify the 40/50 engine for a smaller G.11-based chassis. | 13th Dec 1921 | Box 180 \ M1 \ 9 img007 | |
| Query regarding driving a magneto through a dynamo for the G.11 Swallow and Neptune engines, requesting an experiment on gearing backlash. | 15th Dec 1921 | Box 180 \ M1 \ 9 img008 | |
| Shift of taxation from the car to petrol, smaller engine bores, and the 12/14 HP model. | 1st Oct 1921 | Box 180 \ M1 \ 9 img009 | |
| Study and proposal for modifying the 40/50 HP engine to an OHV configuration, using existing stock parts. | 1st Oct 1921 | Box 180 \ M1 \ 9 img010 | |
| Requesting valve samples to test if they can be resized for a 40/50 HP engine altered to have overhead valves. | 3rd Oct 1921 | Box 180 \ M1 \ 9 img011 | |
| The Essex cylinder head gasket and its relation to the 'Swallow' engine design. | 23th Sep 1921 | Box 180 \ M1 \ 9 img012 | |
| Proposal for a crankshaft for a new 14 HP six-cylinder engine, seeking feedback on the similar Marmon crankshaft design. | 29th Aug 1921 | Box 180 \ M1 \ 9 img013 | |
| Design specifications for a new small six-cylinder engine, referred to as the 'Third Line Model'. | 26th Oct 1921 | Box 180 \ M1 \ 9 img014 | |
| Comparing the development of a six-cylinder engine against a four-cylinder version, outlining costs, design choices, and simplifications. | 1st Aug 1921 | Box 180 \ M1 \ 9 img015 | |
| Proposal for an earthed electrical system for the small 14 HP model, referencing the 'Goshawk II' system. | 1st Aug 1921 | Box 180 \ M1 \ 9 img016 | |
| Request to test a fan belt drive for the 'Goshawk II' engine, detailing its specifications and mentioning a new 14 HP model. | 11th Aug 1921 | Box 180 \ M1 \ 9 img017 | |
| Proposed design modifications for the 'Swallow' model, including wheelbase, body, and mechanical changes. | 3rd Sep 1921 | Box 180 \ M1 \ 9 img018 | |
| Design considerations for a new car model, including ignition, size, and weight comparisons. | 9th Mar 1921 | Box 180 \ M1 \ 9 img019 | |
| Problem of water loss from the radiator during hill climbing and potential solutions. | 9th Sep 1921 | Box 180 \ M1 \ 9 img020 | |
| Policy for building the Goshawk I engine, comparing it to the Vulture and Goshawk II. | 11th Jun 1921 | Box 180 \ M1 \ 9 img021 | |
| Transition from the 'Goshawk II' to a new 40 HP chassis and managing material orders for the 40/50 HP model. | 14th Jun 1930 | Box 180 \ M1 \ 9 img022 | |
| From 'R.' to 'WD.' concerning the procedure for keeping production output six months ahead. | 10th Jun 1921 | Box 180 \ M1 \ 9 img023 | |
| Proposed rig for analyzing crankshaft torque and stress. | 22th Jul 1918 | Box 180 \ M2 \ M2.1 img001 | |
| Oil pressure application for piston and crankshaft tests, and pump modifications. | 22th Jul 1918 | Box 180 \ M2 \ M2.1 img002 | |
| From 'E' to 'DA' requesting to proceed with an experimental test apparatus as per Mr. Royce's wishes. | 22th Jul 1918 | Box 180 \ M2 \ M2.1 img003 | |
| Hand-drawn plan of an oil pump and piston assembly for reverse torque. | 22th Jul 1918 | Box 180 \ M2 \ M2.1 img004 | |
| Pictorial and schematic diagrams of the Condor battery ignition system. | 25th Jun 1918 | Box 180 \ M2 \ M2.1 img005 | |
| Design sketch of a Condor engine connecting rod with handwritten notes. | 24th Mar 1918 | Box 180 \ M2 \ M2.1 img006 | |
| Design considerations for a two-cylinder experimental 'V' Condor engine. | 24th Mar 1918 | Box 180 \ M2 \ M2.1 img007 | |
| Design requirements for a new 'V' engine, referencing Condor, Falcon, and Eagle designs. | 22th Jan 1918 | Box 180 \ M2 \ M2.1 img008 | |
| Heavy engine breathing, crankcase vacuum, and options for piston testing. | 1st Mar 1927 | Box 180 \ M2 \ M2.1 img009 | |
| Letter discussing the performance of a trembler coil and requesting a specific small model for testing. | 12th Mar 1918 | Box 180 \ M2 \ M2.1 img010 | |
| Letter to Count Carlos de Salamanca regarding fuel substitutes for petrol. | 29th Jan 1918 | Box 180 \ M2 \ M2.1 img011 | |
| Letter to Count Carlos de Salamanca regarding fuel alternatives, lubrication, and engine testing procedures. | 29th Jan 1918 | Box 180 \ M2 \ M2.1 img012 | |
| Note on the elastic mounting design for the 'Eagle' engine's electrical starting gear. | 26th Jan 1918 | Box 180 \ M2 \ M2.1 img013 | |
| Requesting the Experimental Department test the 'Eagle' Electrical Starting Gear for engine vibration effects. | 24th Jan 1918 | Box 180 \ M2 \ M2.1 img014 | |
| Formalization of production methods, suggesting roles for Mr. Hives and Mr. Willis. | 4th Jan 1918 | Box 180 \ M2 \ M2.1 img015 | |
| Methods of production and fitting for engine bearings and brasses, advocating for high precision machining to ensure interchangeability. | 4th Jan 1918 | Box 180 \ M2 \ M2.1 img016 | |
| Clarifying a misunderstanding about production methods and the importance of collaborating with specialists. | 25th Jan 1918 | Box 180 \ M2 \ M2.1 img017 | |
| Methods of production, ending with a personal clarification. | 25th Jan 1918 | Box 180 \ M2 \ M2.1 img018 | |
| Requesting the maker and analytical details of 'Quick Step' steel for valves. | 12th Jan 1918 | Box 180 \ M2 \ M2.1 img019 | |
| Recent visit to West Wittering and stressing the value of in-person meetings over correspondence. | 25th Feb 1918 | Box 180 \ M2 \ M2.1 img020 | |
| Suggesting a document be sent to the Technical Director of the Air Ministry for the attention of Lieut. Col. Barrington. | 12th Sep 1918 | Box 180 \ M2 \ M2.1 img021 | |
| Request for taps and drills required to service an office anthracite stove. | 12th Sep 1918 | Box 180 \ M2 \ M2.1 img022 | |
| Responding to a previously received suggestion on how to compare the Goshawk engine. | 18th May 1922 | Box 180 \ M2 \ M2.1 img023 | |
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