| Description | Date | Identifier | |
| Modifications to the New Phantom magneto and an issue with flick start ignition. | 25th Aug 1925 | West Wittering \ N \ 2July1925-September1925 Scan51 | |
| Broken bolt on a 20 HP Slipper Flywheel following a failure in France, detailing the probable cause and the proposed solution. | 25th Aug 1925 | West Wittering \ N \ 2July1925-September1925 Scan52 | |
| Testing a modified steering system for the 20 HP model to prevent wobbles and road shocks. | 25th Aug 1925 | West Wittering \ N \ 2July1925-September1925 Scan53 | |
| Modifications to New Phantom connecting rods and a camshaft bearing oil leak. | 25th Aug 1925 | West Wittering \ N \ 2July1925-September1925 Scan54 | |
| Testing an axle with vertical steering pivots to resolve steering wobbles. | 25th Aug 1925 | West Wittering \ N \ 2July1925-September1925 Scan55 | |
| The performance of the Goshawk III gearbox and clutch. | 8th Aug 1925 | West Wittering \ N \ 2July1925-September1925 Scan56 | |
| Change to fine mesh filters for 20HP & 40HP models due to choked jets. | 25th Aug 1925 | West Wittering \ N \ 2July1925-September1925 Scan57 | |
| Issues with coarse carburetter filters, proposing finer duplex filters and alternative jet designs to prevent choked jets. | 26th Aug 1925 | West Wittering \ N \ 2July1925-September1925 Scan58 | |
| Layout, geometry, and modifications for a hydraulic damper on a front axle. | 26th Aug 1925 | West Wittering \ N \ 2July1925-September1925 Scan59 | |
| Fix for an oil leak at the rear end of EAC and 20HP engines. | 27th Aug 1925 | West Wittering \ N \ 2July1925-September1925 Scan60 | |
| Drawing for Eagle XVI balance weights, noting the dimensions are provisional. | 29th Aug 1925 | West Wittering \ N \ 2July1925-September1925 Scan61 | |
| On the disapproval of a scheme for balance weights on wire wheels, noting Mr. Royce's preference. | 29th Aug 1925 | West Wittering \ N \ 2July1925-September1925 Scan62 | |
| Drawing No. LeC. 2131 and an alteration to the Goshawk slipper flywheel dowels. | 31th Aug 1925 | West Wittering \ N \ 2July1925-September1925 Scan63 | |
| The four-wheel brake cam and servo performance on the Goshawk III. | 1st Sep 1925 | West Wittering \ N \ 2July1925-September1925 Scan64 | |
| Carburetter and induction modifications for the 20.HP car to increase power. | 1st Sep 1925 | West Wittering \ N \ 2July1925-September1925 Scan65 | |
| Using 160 mesh monel metal gauze in petrol filters and potential issues with the vacuum feed on 20HP and EAC models. | 9th Sep 1925 | West Wittering \ N \ 2July1925-September1925 Scan66 | |
| Test results of a boosted Eagle engine and its comparison with the Curtiss and new Falcon X engines. | 1st Sep 1925 | West Wittering \ N \ 2July1925-September1925 Scan67 | |
| Requesting an investigation into the best practices for fitting inserted valve seats for air-cooled engines. | 1st Sep 1925 | West Wittering \ N \ 2July1925-September1925 Scan68 | |
| Steering component specifications, including worm lead and pendulum lever, and the impact on self-centring. | 2nd Sep 1925 | West Wittering \ N \ 2July1925-September1925 Scan69 | |
| Telegram inquiring about 'gyrostatic wobble' in relation to wheel speed and suggesting a meeting to discuss the issue. | 4th Sep 1925 | West Wittering \ N \ 2July1925-September1925 Scan70 | |
| Post Office Telegraph form with a short handwritten message arranging a meeting time. | 25th Sep 1925 | West Wittering \ N \ 2July1925-September1925 Scan71 | |
| Proposal to modify the exhaust heating system on the New Phantom to improve circulation by rearranging pipes, thereby eliminating a valve. | 1st Sep 1925 | West Wittering \ N \ 2July1925-September1925 Scan72 | |
| Optimal pivot distance for a new front axle design to improve steering and reduce weight. | 9th Sep 1925 | West Wittering \ N \ 2July1925-September1925 Scan73 | |
| Arranging for the testing of a set of Houdaille hydraulic shock absorbers. | 1st Sep 1925 | West Wittering \ N \ 2July1925-September1925 Scan74 | |
| Request for samples of suitable hydraulic shock dampers, such as the 'Derihon' and 'Wilson', for evaluation by Mr. Royce. | 9th May 1925 | West Wittering \ N \ 2July1925-September1925 Scan75 | |
| Modifications for the New Phantom petrol tank. | 5th Sep 1925 | West Wittering \ N \ 2July1925-September1925 Scan76 | |
| Use of larger .312 bolts for the 20HP starting handle support following reports of slackening. | 7th Sep 1925 | West Wittering \ N \ 2July1925-September1925 Scan77 | |
| Internal memorandum discussing the design, patent implications, and experimental nature of a new hydraulic shock damper for the Phantom model. | 11th Sep 1925 | West Wittering \ N \ 2July1925-September1925 Scan78 | |
| Two alternative designs for an exhaust cutout intended for the Indian market. | 11th Sep 1925 | West Wittering \ N \ 2July1925-September1925 Scan79 | |
| Investigating high-speed wheel wobbles and proposals for experiments to understand and eliminate the phenomenon. | 14th Sep 1925 | West Wittering \ N \ 2July1925-September1925 Scan80 | |
| Mitigating wheel wobble and tramping speed through design and testing. | 11th Aug 1920 | West Wittering \ N \ 2July1925-September1925 Scan81 | |
| Telegram from Royce regarding weight reduction for axle, brake, hub, and wheel components. | 14th Sep 1925 | West Wittering \ N \ 2July1925-September1925 Scan82 | |
| Modifications for the New Phantom radiator support, suggesting case-hardening or whitemetalling. | 15th Sep 1925 | West Wittering \ N \ 2July1925-September1925 Scan83 | |
| Internal memorandum from R. to H.S. requesting modifications to the Goshawk I chassis, including fitting smaller wheels. | 15th Sep 1925 | West Wittering \ N \ 2July1925-September1925 Scan84 | |
| Proposing the inclusion of exhaust analysis in engine testing to check distribution. | 15th Sep 1925 | West Wittering \ N \ 2July1925-September1925 Scan85 | |
| Alternative metals for H.T. distributors and comparing insulation to Bosch components. | 15th Sep 1925 | West Wittering \ N \ 2July1925-September1925 Scan86 | |
| Instructions from Mr. Royce on modifying a badly worn Phantom radiator pivot and sphere. | 16th Sep 1925 | West Wittering \ N \ 2July1925-September1925 Scan87 | |
| Querying the comparative weights of front axle hubs for the New Phantom model. | 19th Sep 1925 | West Wittering \ N \ 2July1925-September1925 Scan88 | |
| Requesting proposals for improving the control of the front axle on the Goshawk I car. | 21th Sep 1925 | West Wittering \ N \ 2July1925-September1925 Scan89 | |
| Letter from 'R' to Mr. Rowledge discussing design improvements for the 'Eagle' XX aero engine. | 22th Sep 1924 | West Wittering \ N \ 2July1925-September1925 Scan90 | |
| Developments on Eagle IX carburettors, piston trouble, Goshawk tyres, and E.A.C.E. engine performance. | 23th Sep 1925 | West Wittering \ N \ 2July1925-September1925 Scan91 | |
| Specifications for speed models, specifically that they should be short chassis, and instructions for wing improvements. | 23th Sep 1925 | West Wittering \ N \ 2July1925-September1925 Scan92 | |
| List of six agreed-upon modifications for a 'Next 10,000 Miles Phantom' car. | 23th Sep 1925 | West Wittering \ N \ 2July1925-September1925 Scan93 | |
| The setup and future testing of various shock dampers. | 23th Sep 1925 | West Wittering \ N \ 2July1925-September1925 Scan94 | |
| Request to change the bonnet handles on chassis 7-EX from sheet metal to cast nickel silver. | 23th Sep 1925 | West Wittering \ N \ 2July1925-September1925 Scan95 | |
| Requesting the Phantom rear axle track be widened to 57 inches to match the front track. | 23th Sep 1925 | West Wittering \ N \ 2July1925-September1925 Scan96 | |
| Design improvements for the 20HP steering system to reduce low-speed wobble. | 23th Sep 1925 | West Wittering \ N \ 2July1925-September1925 Scan97 | |
| Letter to coachbuilders Barker & Co. regarding modifications to a 20HP chassis, including windscreen, steering, and wheel arches. | 25th Sep 1925 | West Wittering \ N \ 2July1925-September1925 Scan98 | |
| Spring setup in the cross steering tube to fix high-speed wobbles in the Phantom model. | 25th Sep 1925 | West Wittering \ N \ 2July1925-September1925 Scan99 | |
| List of proposed modifications for the Phantom front axle. | 25th Sep 1925 | West Wittering \ N \ 2July1925-September1925 Scan100 | |
| Modifications to a Phantom car being sent to France. | 26th Sep 1925 | West Wittering \ N \ 2July1925-September1925 Scan101 | |
| Issues and potential solutions for autovac tanks, including suggestions from Mr. Royce. | 28th Sep 1925 | West Wittering \ N \ 2July1925-September1925 Scan102 | |
| Aero engine programme, including progress on the Falcon X and Eagle XVI engines. | 1st Sep 1925 | West Wittering \ N \ 2July1925-September1925 Scan103 | |
| Missing parts and a critical oversight in the assembly of a Silver Rogue engine. | 29th Sep 1937 | West Wittering \ N \ 2July1925-September1925 Scan104 | |
| List of twelve specified modifications for the next Phantom model for France. | 9th Sep 1925 | West Wittering \ N \ 2July1925-September1925 Scan105 | |
| Design and requirements for petrol filters on Phantom and Goshawk models. | 29th Sep 1925 | West Wittering \ N \ 2July1925-September1925 Scan106 | |
| Page 2 of a document describing a duplex outgoing filter system with a 2-gallon reserve. | 29th Sep 1925 | West Wittering \ N \ 2July1925-September1925 Scan107 | |
| Decision to abandon the separate compartment scheme for the rear petrol tank in favour of two different length suction pipes. | 29th Sep 1925 | West Wittering \ N \ 2July1925-September1925 Scan108 | |
| Design and manufacturing process for bonnet louvres, including a cross-sectional diagram. | 29th Sep 1925 | West Wittering \ N \ 2July1925-September1925 Scan109 | |
| Letter detailing the dispatch of original design schemes and drawings for the Falcon X engine. | 9th Sep 1925 | West Wittering \ N \ 2July1925-September1925 Scan110 | |
| Performance issues and corrective actions for a 78-Goshawk III car. | 30th Sep 1925 | West Wittering \ N \ 2July1925-September1925 Scan111 | |
| Letter to the Air Ministry detailing the technical requirements for a double spark 8-cylinder magneto for the Eagle XVI engine. | 30th Sep 1925 | West Wittering \ N \ 2July1925-September1925 Scan112 | |
| Letter from F. H. Royce discussing potential modifications and reliability issues of magnetos for Eagle XVI, Packard, and Falcon X engines. | 8th Oct 1917 | West Wittering \ N \ 2July1925-September1925 Scan113 | |
| Investigating an audible 'knock' on Phantom chassis, suspected to be caused by inflexible pistons. | 5th Oct 1925 | West Wittering \ N \ 2October1925-December1925 Scan0 | |
| The investigation of piston knocks. | 12th Jun 1925 | West Wittering \ N \ 2October1925-December1925 Scan1 | |
| Investigating the cause of piston knock and testing different piston designs. | 12th Jun 1925 | West Wittering \ N \ 2October1925-December1925 Scan2 | |
| Tests on piston clearance and splitting pistons to reduce noise and optimize skirt flexibility. | 1st Oct 1925 | West Wittering \ N \ 2October1925-December1925 Scan3 | |
| Blueprint showing the grinding dimensions for experimental E.A.C. pistons. | 9th Oct 1928 | West Wittering \ N \ 2October1925-December1925 Scan4 | |
| How out-of-truth tyres, particularly low-pressure balloon types, cause steering wobbles. | 12th Jun 1925 | West Wittering \ N \ 2October1925-December1925 Scan5 | |
| Page advising on tyre management to address car wobble, specifically for high-pressure tyres. | 6th Oct 1925 | West Wittering \ N \ 2October1925-December1925 Scan6 | |
| High-speed steering wobble tests with different tyre types. | 6th Oct 1925 | West Wittering \ N \ 2October1925-December1925 Scan7 | |
| Tests investigating wheel wobble, comparing different tyre and spring arrangements. | 12th Jun 1925 | West Wittering \ N \ 2October1925-December1925 Scan8 | |
| Comparison between two different types of tyre treads with technical specifications. | 20th Oct 1925 | West Wittering \ N \ 2October1925-December1925 Scan9 | |
| Diagrammatic study of balloon tyre contact patches under various test conditions and setups. | 12th Jun 1925 | West Wittering \ N \ 2October1925-December1925 Scan10 | |
| Tests conducted to mitigate high-speed steering wobbles. | 9th Oct 1925 | West Wittering \ N \ 2October1925-December1925 Scan11 | |
| Endurance testing of a hydraulic device and investigating steering tube geometry to reduce wobbling. | 12th Jun 1925 | West Wittering \ N \ 2October1925-December1925 Scan12 | |
| Issues with the 'Phantom' gearbox where 1st and 2nd speeds disengage under power. | 1st Oct 1925 | West Wittering \ N \ 2October1925-December1925 Scan13 | |
| Investigating flexibility in the servo operating mechanism to resolve 'jagger' issues on 'India' (X5370) and Phantom models. | 1st Oct 1925 | West Wittering \ N \ 2October1925-December1925 Scan14 | |
| High-speed wobbles and wheel shimmy, comparing internal findings with a translated paper from Michelin. | 1st Oct 1925 | West Wittering \ N \ 2October1925-December1925 Scan15 | |
| Page 2 of an experimental report discussing findings on vehicle wobbles, including tyre pressures and track width. | 12th Jun 1925 | West Wittering \ N \ 2October1925-December1925 Scan16 | |
| Cover note regarding a report on high-speed steering wobbles and the circulation of its French translation. | 10th Oct 1925 | West Wittering \ N \ 2October1925-December1925 Scan17 | |
| High speed wobbles and Michelin's investigations into the phenomenon. | 1st Oct 1925 | West Wittering \ N \ 2October1925-December1925 Scan18 | |
| Page 2, detailing findings on vehicle wobble, track width, and tyre pressures. | 10th Oct 1925 | West Wittering \ N \ 2October1925-December1925 Scan19 | |
| Piston troubles and the need for a modified design for the 'Phantom'. | 12th Oct 1925 | West Wittering \ N \ 2October1925-December1925 Scan20 | |
| Piston knocks, detailing the theory that a flexible piston skirt is required for silent operation across various temperatures. | 12th Jun 1925 | West Wittering \ N \ 2October1925-December1925 Scan21 | |
| Testing standard pistons with modified skirt splits. | 12th Jun 1925 | West Wittering \ N \ 2October1925-December1925 Scan22 | |
| Piston modifications to improve skirt flexibility and reduce engine knocking. | 1st Oct 1925 | West Wittering \ N \ 2October1925-December1925 Scan23 | |
| The B.H.B. self-adjusting piston as used on the Bentley during a 24-hour record. | 12th Jun 1925 | West Wittering \ N \ 2October1925-December1925 Scan24 | |
| Composite and split-skirt piston designs for engines. | 10th Oct 1925 | West Wittering \ N \ 2October1925-December1925 Scan25 | |
| Blueprint drawing of a composite aluminium piston design. | 12th Oct 1925 | West Wittering \ N \ 2October1925-December1925 Scan26 | |
| Blueprint drawing of a Silver Ghost piston that was trialled in 1915. | 18th Dec 1925 | West Wittering \ N \ 2October1925-December1925 Scan27 | |
| Blank pages with hole punches, possibly a divider or back sheet. | 8th Dec 1925 | West Wittering \ N \ 2October1925-December1925 Scan28 | |
| Delay in the Phantom car's 10,000-mile test due to difficulties producing duralumin brake carrier plates. | 10th Oct 1925 | West Wittering \ N \ 2October1925-December1925 Scan29 | |
| The performance of a Phantom car at Brooklands. | 30th Jul 1925 | West Wittering \ N \ 2October1925-December1925 Scan30 | |
| Performance tests, comparing the acceleration and top speed of a New Phantom against a Silver Ghost. | 12th Jun 1925 | West Wittering \ N \ 2October1925-December1925 Scan31 | |
| Comparing the performance of the Phantom and Silver Ghost models. | 12th Jun 1925 | West Wittering \ N \ 2October1925-December1925 Scan32 | |
| Blank document with two punch holes. | 12th Oct 1925 | West Wittering \ N \ 2October1925-December1925 Scan33 | |
| Outlining the fundamental points for judging car performance. | 12th Oct 1925 | West Wittering \ N \ 2October1925-December1925 Scan34 | |
| Vehicle acceleration concerning car weight, engine power, and axle ratio, illustrated with graphs. | 12th Jun 1925 | West Wittering \ N \ 2October1925-December1925 Scan35 | |
| Factors affecting vehicle performance, including tractive resistance, carburation, and flywheel inertia. | 12th Jun 1925 | West Wittering \ N \ 2October1925-December1925 Scan36 | |
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