| Description | Date | Identifier | |
| Need to lighten union connections for stock to match the design used for aero work. | 28th Dec 1926 | Box 66a \ 3 scan0184 | |
| Recommending the adoption of spherical unions as an improvement over the current standard. | 29th Dec 1926 | Box 66a \ 3 scan0185 | |
| Introduction of new spherical shape unions versus continuing with standard cone unions for the D.2. Series. | 3rd Jan 1927 | Box 66a \ 3 scan0186 | |
| The design and standardization of pipe unions, discussing materials and thread pitches. | 9th Jan 1927 | Box 66a \ 3 scan0187 | |
| Standardisation of chassis parts, specifically union connections, to improve design. | 20th Dec 1926 | Box 66a \ 3 scan0188 | |
| Standardisation sheet with remarks regarding the production and approval of union connections. | 10th Feb 1927 | Box 66a \ 3 scan0189 | |
| Preliminary lightening of the Phantom engine's waterpipe, flywheel, and clutch, alongside improvements to the induction system. | 10th Feb 1927 | Box 66a \ 3 scan0190 | |
| Design changes to the petrol tank, including the deletion of the incoming filter and alterations to the sump and outgoing filter. | 11th Jun 1925 | Box 66a \ 3 scan0191 | |
| Design choices for the 'V' series oil sump cover and drain plug. | 4th Mar 1925 | Box 66a \ 3 scan0192 | |
| Need for better petrol filtration and proposing a new specification for future tanks. | 20th Aug 1925 | Box 66a \ 3 scan0193 | |
| Specifications and issues with fuel filter gauzes in carburettors. | 1st Aug 1925 | Box 66a \ 3 scan0194 | |
| The taper of the low-speed needle and the mesh of filters on the New Phantom and Goshawk carburetters. | 1st Aug 1925 | Box 66a \ 3 scan0195 | |
| Fault and proposed improvements for the E.A.C. carburetter filter stud and washer. | 24th Aug 1925 | Box 66a \ 3 scan0196 | |
| Changing the filters in the back tank and carburetters to fine mesh to solve choked jets. | 25th Aug 1925 | Box 66a \ 3 scan0197 | |
| Design and troubleshooting of coarse and fine filters in relation to carburettor and choked jets. | 1st Aug 1925 | Box 66a \ 3 scan0198 | |
| Petrol filters for 20 HP and 40/50 HP models, discussing mesh changes and issues with foreign matter. | 25th Sep 1924 | Box 66a \ 3 scan0199 | |
| Various petrol filtration setups on Silver Ghost, 20 HP, and E.A.C. models. | 27th Aug 1925 | Box 66a \ 3 scan0200 | |
| Internal memorandum discussing the use of monel metal gauze in petrol filters. | 1st Sep 1925 | Box 66a \ 3 scan0201 | |
| Changing the stud material from Delta Metal to Stainless Steel for the E.A.C. carburetter filter. | 1st Sep 1925 | Box 66a \ 3 scan0202 | |
| Six modifications to the New Phantom petrol tank, based on feedback from the Sales department. | 9th Sep 1925 | Box 66a \ 3 scan0203 | |
| Instructions and considerations for Phantom and Goshawk petrol filters. | 29th Sep 1925 | Box 66a \ 3 scan0204 | |
| Improving filter arrangements from those used in the Silver Ghost. | 15th Feb 1926 | Box 66a \ 3 scan0205 | |
| Suggesting design improvements for petrol fillers and gauges. | 15th Feb 1926 | Box 66a \ 3 scan0206 | |
| Using soft aluminum washers instead of fibre ones for spherical unions. | 8th Mar 1926 | Box 66a \ 3 scan0207 | |
| Choking of 20 HP petrol filters and proposing new improved filter systems. | 3rd Jun 1926 | Box 66a \ 3 scan0208 | |
| Standardization of spherical type unions and a potential material revision from gunmetal to steel. | 6th Jun 1925 | Box 66a \ 3 scan0209 | |
| Revised design, materials, and testing of spherical seated unions. | 19th Dec 1925 | Box 66a \ 3 scan0210 | |
| Suggestion from Melbourne to change the position of the petrol tank filler due to filling issues with Bowsers. | 29th Nov 1928 | Box 66a \ 3 scan0211 | |
| Design improvements and issues with 40/50 water pumps. | 9th Jan 1928 | Box 66a \ 3 scan0212 | |
| Use of soft aluminium washers in place of fibre washers for revised spherical unions. | 8th Mar 1926 | Box 66a \ 3 scan0213 | |
| Oil loss from a New Phantom Engine due to a loose oil pipe clip during testing, proposing potential solutions. | 16th Aug 1926 | Box 66a \ 3 scan0214 | |
| Oil loss from a New Phantom Engine caused by a loose oil pipe clip. | 17th Aug 1926 | Box 66a \ 3 scan0215 | |
| Mr. Royce's approval of spherical seated unions and raising a query about the spigotting of the metal washer. | 12th Jan 1927 | Box 66a \ 3 scan0216 | |
| Fuel delivery issue with the new Phantom petrol tank filter and the proposed modification. | 31th Jan 1927 | Box 66a \ 3 scan0217 | |
| Petrol filter modifications and their impact on Autovac delivery performance, including tabulated test results. | 31th Jan 1927 | Box 66a \ 3 scan0218 | |
| Specifications for cork seating and petrol piping related to an Autovac system, with associated diagrams. | 8th Oct 1927 | Box 66a \ 3 scan0219 | |
| Dispatch of a drawing for the Sports Phantom oil strainer. | 8th Oct 1927 | Box 66a \ 3 scan0220 | |
| Modifications to the oil relief unit, gallery pipe, and crankchamber, referencing drawing Lec. 2483. | 9th Nov 1927 | Box 66a \ 3 scan0221 | |
| The oil gallery pipe for the EAC.10 Sports Phantom, specifying sweating instead of brazing. | 16th Nov 1927 | Box 66a \ 3 scan0222 | |
| Misleading oil relief valve pressures for the 40/50 chassis, suggesting revised figures for drawings. | 12th Jun 1925 | Box 66a \ 4 scan0001 | |
| Pressure discrepancies for the 40/50HP Chassis oil relief valve. | 24th Sep 1925 | Box 66a \ 4 scan0002 | |
| The difficulties of dismantling the oil relief valve on the Phantom model. | 27th Jan 1926 | Box 66a \ 4 scan0003 | |
| Proposal to use stainless steel valves and seats to prevent oil pressure failures caused by foreign matter. | 13th Feb 1926 | Box 66a \ 4 scan0004 | |
| Oil relief valve sticking issues and potential design solutions for Phantom & Goshawk models. | 13th Feb 1926 | Box 66a \ 4 scan0005 | |
| Removal of a relief valve on the Phantom and the design of new guideless replacement valves. | 20th Feb 1926 | Box 66a \ 4 scan0006 | |
| Design of oil relief valves and the challenges with bow spring flexibility and stress. | 3rd Mar 1926 | Box 66a \ 4 scan0007 | |
| Bow spring design options for a pump casing and the accessibility of a valve. | 13th Mar 1926 | Box 66a \ 4 scan0008 | |
| Sticking oil pressure relief valves for the Phantom engine. | 13th Mar 1926 | Box 66a \ 4 scan0009 | |
| Phantom Oil Pressure Relief Valve, confirming the dispatch of associated blueprints. | 18th Mar 1926 | Box 66a \ 4 scan0010 | |
| Delayed fitting of a new oil relief valve for the 20 HP and Phantom models. | 20th Mar 1926 | Box 66a \ 4 scan0011 | |
| Proceeding with the detailing of improvements for Phantom & Goshawk oil relief valves. | 23th Mar 1926 | Box 66a \ 4 scan0012 | |
| Technical memo discussing the design of Phantom oil relief valves, proposing a three-valve system for extra security. | 24th Mar 1926 | Box 66a \ 4 scan0013 | |
| Comparing two blueprint schemes for Phantom oil relief valves, outlining their respective disadvantages. | 20th Apr 1926 | Box 66a \ 4 scan0014 | |
| Instruction to hold work on the Phantom Oil Relief Valves design to incorporate alterations for accessibility and crankcase compatibility. | 11th Jun 1926 | Box 66a \ 4 scan0015 | |
| Revision to the Phantom oil relief valve and requesting tests on an experimental unit. | 26th Jun 1926 | Box 66a \ 4 scan0016 | |
| Oil pressure figures for Phantom relief valves. | 29th Jun 1926 | Box 66a \ 4 scan0017 | |
| Corrections and alterations to a bow spring control model for a relief valve. | 19th Jul 1926 | Box 66a \ 4 scan0018 | |
| The bow spring type of control for a relief valve. | 22th Jul 1926 | Box 66a \ 4 scan0019 | |
| Modifications to a bow spring control model for a relief valve. | 24th Jul 1926 | Box 66a \ 4 scan0020 | |
| Standardisation of an oil relief valve to improve reliability. | 22th Sep 1926 | Box 66a \ 4 scan0021 | |
| Oil pressure inconsistencies in 40/50 Oil Relief Valves. | 17th Nov 1926 | Box 66a \ 4 scan0022 | |
| Oil pressure specifications and operation for Phantom oil relief valves. | 22th Nov 1926 | Box 66a \ 4 scan0023 | |
| Continuation of a note explaining a calculation for main oil pressure. | 22th Nov 1926 | Box 66a \ 4 scan0024 | |
| The testing of a 20 HP oil relief valve which is chattering and vibrating. | 30th Nov 1926 | Box 66a \ 4 scan0025 | |
| Testing a 20 HP pump to eliminate chattering by modifying the low-pressure oil connection to mimic the Phantom pump's design. | 1st Jan 1927 | Box 66a \ 4 scan0026 | |
| The specifications for springs in a Phantom oil relief valve. | 1st Jan 1927 | Box 66a \ 4 scan0027 | |
| Alterations to the springs in Phantom relief valves due to incorrect ratings and their effect on oil pressure. | 1st Jun 1927 | Box 66a \ 4 scan0028 | |
| Three comparative graphs showing oil pressure versus engine revolutions for a Phantom new type relief valve. | 1st Jul 1927 | Box 66a \ 4 scan0029 | |
| The Phantom Relief Valve and the suitability of a new batch of bow spring material. | 1st Jul 1927 | Box 66a \ 4 scan0030 | |
| Drawing Lec. 2483 concerning the oil relief unit, gallery pipe, and a revised crankchamber design. | 9th Nov 1927 | Box 66a \ 4 scan0031 | |
| Alterations to the Phantom Oil Relief Valve. | 19th Nov 1927 | Box 66a \ 4 scan0032 | |
| 23' fan fouling the throttle governor housing and a proposal to reduce its diameter to 22'. | 14th Jan 1925 | Box 66a \ 4 scan0033 | |
| Results of bench experiments conducted on EAC radiator fans. | 20th Mar 1925 | Box 66a \ 4 scan0034 | |
| Development, performance testing, and design modifications of various experimental fans. | 20th Mar 1925 | Box 66a \ 4 scan0035 | |
| Experiments and modifications on various fan designs to achieve a low power-thrust curve. | 20th Mar 1925 | Box 66a \ 4 scan0036 | |
| Continued report on experiments to optimize engine fan blade performance and efficiency. | 20th Mar 1925 | Box 66a \ 4 scan0037 | |
| Engine fan speed ratios, belt drive optimization, and proposals for road experiments. | 20th Mar 1925 | Box 66a \ 4 scan0038 | |
| Suggestion to standardize an experimental improvement on a fan drive ratio. | 18th Mar 1925 | Box 66a \ 4 scan0039 | |
| Graph comparing the performance of various standard and experimental engine cooling fans, plotting speed and power against axial thrust. | 18th Mar 1925 | Box 66a \ 4 scan0040 | |
| Graph comparing the thrust and power performance of various fan designs against fan speed. | 19th Mar 1925 | Box 66a \ 4 scan0041 | |
| V-belt contact points, experimental fan speed ratios, and an order for 300 chassis. | 23th Mar 1925 | Box 66a \ 4 scan0042 | |
| And recommending new experimental ratios for Kestrel Airscrew Carrier (EAC) Fans. | 24th Mar 1925 | Box 66a \ 4 scan0043 | |
| The failure of original EAC 4-bladed sheetmetal fans. | 1st Apr 1925 | Box 66a \ 4 scan0044 | |
| Request to produce an experimental fan set with alternative higher speed ratios based on Mr Clarke's request. | 2nd Apr 1935 | Box 66a \ 4 scan0045 | |
| Requesting the production of one set of a fan blade and flange, accompanied by blueprints. | 24th Apr 1925 | Box 66a \ 4 scan0046 | |
| Broken E.A.C. fan belt that failed during engine testing. | 1st May 1925 | Box 66a \ 4 scan0047 | |
| Precautions to ensure fans and fan belts on the new 'Phantom' chassis are balanced and run smoothly. | 4th Jun 1925 | Box 66a \ 4 scan0048 | |
| Engine overheating, discussing fan and cowl design. | 17th Jul 1925 | Box 66a \ 4 scan0049 | |
| Continued report on radiator efficiency tests, comparing airflow at different vehicle speeds. | 9th May 1927 | Box 66a \ 4 scan0050 | |
| Experiments with the Phantom's radiator fan and shutter control design. | 9th May 1927 | Box 66a \ 4 scan0051 | |
| Black finish on a control quadrant, suggesting re-engraving the lettering to show as German Silver. | 23th Jun 1919 | Box 66a \ 4 scan0052 | |
| List of assembled parts and their corresponding numbers for chassis 1.E.X. | 1st Jun 1919 | Box 66a \ 4 scan0053 | |
| Oil leak from the Magneto Control Tube on a 40/50 chassis and a request to investigate a fix. | 2nd Jul 1919 | Box 66a \ 4 scan0054 | |
| Inquiry about the lubrication requirements and potential under-oiling of the control sphere on a 40/50 chassis. | 2nd Jul 1919 | Box 66a \ 4 scan0055 | |
| Solution for oil leaks from the magneto control on the 40/50 chassis. | 28th Jul 1919 | Box 66a \ 4 scan0056 | |
| Oil leakage from the magneto control tube on the 40/50 chassis. | 31th Jul 1919 | Box 66a \ 4 scan0057 | |
| Lubrication of the Control Sphere on a 40/50 HP chassis. | 25th Oct 1918 | Box 66a \ 4 scan0058 | |
| Adjustment of the control connection between the throttle and the governor. | 16th Apr 1921 | Box 66a \ 4 scan0059 | |
| Car's fuel consumption performance and mixture control operation. | 20th Jun 1921 | Box 66a \ 4 scan0060 | |
| Letter from Rolls-Royce of America requesting prints for the alteration to the lubrication of the Axle Control Sphere. | 4th Aug 1921 | Box 66a \ 4 scan0061 | |
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