| Description | Date | Identifier | |
| New method for lubricating the off-side bearing of the clutch operating shaft. | 16th Jul 1926 | West Wittering \ P \ July1926-September1926 Scan030 | |
| Scheme for bronze bushes in the cast iron exhaust cutout nozzle for the Phantom model. | 16th Jul 1926 | West Wittering \ P \ July1926-September1926 Scan031 | |
| Adaptation of the forward support bracket for rear hydraulic shock dampers. | 16th Jul 1926 | West Wittering \ P \ July1926-September1926 Scan032 | |
| Proposed wings, drawings, and axle modifications for a Sports Phantom 10-EX. | 17th Jul 1926 | West Wittering \ P \ July1926-September1926 Scan033 | |
| Suitability of rubber component dimensions for hydraulic shock dampers. | 17th Jul 1926 | West Wittering \ P \ July1926-September1926 Scan034 | |
| Proposal for stiffening the front scuttle armature with a cast dash, to be tested on vehicle 12-EX. | 17th Jul 1926 | West Wittering \ P \ July1926-September1926 Scan035 | |
| Requesting deflection measurements on Phantom and 20HP frames to analyse body distortion. | 19th Jul 1926 | West Wittering \ P \ July1926-September1926 Scan036 | |
| Correction and alteration of a bow spring type control model for a relief valve. | 19th Jul 1926 | West Wittering \ P \ July1926-September1926 Scan037 | |
| Agreement to test 2000 lb springs inside the steering tube for the Phantom model. | 22th Jul 1926 | West Wittering \ P \ July1926-September1926 Scan038 | |
| Test drive report on the experimental car 12-EX, detailing steering, engine, and vibration issues. | 22th Jul 1926 | West Wittering \ P \ July1926-September1926 Scan039 | |
| Petrol gauge issues on the 12-EX, covering weak washers and a request for a new dial design. | 22th Jul 1926 | West Wittering \ P \ July1926-September1926 Scan040 | |
| Efficiency of scavenger pumps by reducing their speed and altering their dimensions. | 22th Jul 1926 | West Wittering \ P \ July1926-September1926 Scan041 | |
| Requesting a diagram of the brake leverages to investigate an issue with excessive leverage. | 22th Jul 1926 | West Wittering \ P \ July1926-September1926 Scan042 | |
| Reminding to try the wheel balancing scheme shewn on N. scheme 2048, to avoid the appearance of three masses. | 22th Jul 1926 | West Wittering \ P \ July1926-September1926 Scan043 | |
| Proposal from Mr. Royce to use Kelmet metal bushes to prevent squeaking on the Phantom clutch. | 22th Jul 1926 | West Wittering \ P \ July1926-September1926 Scan044 | |
| Internal memorandum regarding a comparison of headlamps, recommending Carl Zeiss over the current Lucas lamps. | 23th Jul 1926 | West Wittering \ P \ July1926-September1926 Scan045 | |
| Confidential memo about a cost-sharing proposal with Hoopers for two experimental car bodies. | 23th Jul 1926 | West Wittering \ P \ July1926-September1926 Scan046 | |
| New balance weight scheme for 20HP and 40/50 steel artillery wheels. | 23th Jul 1926 | West Wittering \ P \ July1926-September1926 Scan047 | |
| Modifications for fitting hydraulic shock dampers on the rear of an EAC 7 chassis. | 23th Jul 1926 | West Wittering \ P \ July1926-September1926 Scan048 | |
| Modifications to the rear brake operating gear and frame gussets to allow for the fitting of hydraulic shock dampers. | 23th Jul 1926 | West Wittering \ P \ July1926-September1926 Scan049 | |
| Modifications to the rear brake camshaft and toggle gear. | 23th Jul 1926 | West Wittering \ P \ July1926-September1926 Scan050 | |
| Modification to the rear supports of the Phantom & EAC.8 subframes, referencing schemes 2241 and 2239. | 23th Jul 1926 | West Wittering \ P \ July1926-September1926 Scan051 | |
| Print showing a potential middle support for a subframe and a modification to the front support. | 23th Jul 1926 | West Wittering \ P \ July1926-September1926 Scan052 | |
| Modification to the frame cross members to resolve a fouling issue with the rear spring front anchorage. | 23th Jul 1926 | West Wittering \ P \ July1926-September1926 Scan053 | |
| Mr. Royce's desire to expedite the Goshawk I starter gear due to issues with the Phantom starter. | 23th Jul 1926 | West Wittering \ P \ July1926-September1926 Scan054 | |
| Design flaw in a model of a bow spring type control for a relief valve. | 24th Jul 1926 | West Wittering \ P \ July1926-September1926 Scan055 | |
| Alterations to the Phantom exhaust pipe and silencer to resolve expansion issues. | 24th Jul 1926 | West Wittering \ P \ July1926-September1926 Scan056 | |
| Request for the results of experiments with the steel spring in the servo operating gear for the Phantom and 20HP models. | 12th Aug 1926 | West Wittering \ P \ July1926-September1926 Scan057 | |
| Mr. Royce's interest in investigating new front axle designs, referencing Lancia and Sizaire. | 13th Aug 1926 | West Wittering \ P \ July1926-September1926 Scan058 | |
| From R. to EFC. investigating a failure to engage with a sequence starter motor. | 13th Aug 1926 | West Wittering \ P \ July1926-September1926 Scan059 | |
| Schemes for a new framed instrument patch, including details on various instruments and dial aesthetics. | 13th Aug 1926 | West Wittering \ P \ July1926-September1926 Scan060 | |
| Acquisition of a 20HP Lorraine car for competitive analysis. | 13th Aug 1926 | West Wittering \ P \ July1926-September1926 Scan061 | |
| Test drive report providing feedback on a High Compression 20HP car, listing five specific items for alteration. | 13th Aug 1926 | West Wittering \ P \ July1926-September1926 Scan062 | |
| Outlining scheme 2215 for mounting steel artillery wheels on the Phantom model with a new axle. | 14th Aug 1926 | West Wittering \ P \ July1926-September1926 Scan063 | |
| From R. to EFC. querying the progress of electrical experiments on coils, points, and condensers. | 16th Aug 1926 | West Wittering \ P \ July1926-September1926 Scan064 | |
| Experiment observing valve rotation and oscillation in Phantom and 20HP engines to investigate valve seat erosion. | 18th Aug 1926 | West Wittering \ P \ July1926-September1926 Scan065 | |
| 'Phantom Steering', attributing the cause to balloon tyres and proposing hydraulic damping as a solution. | 18th Aug 1926 | West Wittering \ P \ July1926-September1926 Scan066 | |
| Determination of the optimal induction pipe ramming length for high M.E.P. | 19th Aug 1926 | West Wittering \ P \ July1926-September1926 Scan067 | |
| Causes of pre-ignition and valve erosion, and proposing a test. | 19th Aug 1926 | West Wittering \ P \ July1926-September1926 Scan068 | |
| Valve erosion in a Curtiss engine and suggesting methods to investigate the cause. | 19th Aug 1926 | West Wittering \ P \ July1926-September1926 Scan069 | |
| Valve movement, its causes like spring action, and proposals to prevent valve rotation. | 19th Aug 1926 | West Wittering \ P \ July1926-September1926 Scan070 | |
| Steering troubles and the proposed addition of friction to the pivots. | 20th Aug 1926 | West Wittering \ P \ July1926-September1926 Scan071 | |
| Steering performance, wobbles, and potential improvements for the 12-EX model. | 20th Aug 1926 | West Wittering \ P \ July1926-September1926 Scan072 | |
| Outlining the parts and modifications required to complete a chassis and improve its riding qualities. | 20th Aug 1926 | West Wittering \ P \ July1926-September1926 Scan073 | |
| The practice of pegging pipe unions in aluminium castings and Mr Royce's agreement to omit them. | 23th Aug 1926 | West Wittering \ P \ July1926-September1926 Scan074 | |
| Mr. Royce's disapproval of a Phantom steering scheme and the next task of designing a spring. | 26th Aug 1926 | West Wittering \ P \ July1926-September1926 Scan075 | |
| The arrangement of extra friction in the pivots of the new Phantom front axle. | 27th Aug 1926 | West Wittering \ P \ July1926-September1926 Scan076 | |
| Modifying the 20HP front axle pivot friction scheme, referencing the Phantom model. | 27th Aug 1926 | West Wittering \ P \ July1926-September1926 Scan077 | |
| Scheme 2256, detailing modifications to the servo stop and brake linkage system. | 27th Aug 1926 | West Wittering \ P \ July1926-September1926 Scan078 | |
| Modification to the Phantom servo brake gear to prevent fouling of the balancing lever. | 27th Aug 1926 | West Wittering \ P \ July1926-September1926 Scan079 | |
| Alterations to the mounting of the rear brake differentials and related components. | 27th Aug 1926 | West Wittering \ P \ July1926-September1926 Scan080 | |
| Five detailed proposals for improving vehicle steering, concluding that the current slow steering setup is best for safety. | 27th Aug 1926 | West Wittering \ P \ July1926-September1926 Scan081 | |
| Requesting updates on various experimental coachwork projects to arrange a programme with coachbuilders. | 28th Aug 1926 | West Wittering \ P \ July1926-September1926 Scan082 | |
| Potential engine modifications for the Phantom model, focusing on induction pipes, carburettors, and compression ratios. | 30th Aug 1926 | West Wittering \ P \ July1926-September1926 Scan083 | |
| Authorisation to obtain and fit Carl Zeiss headlamps to a 10-EX Phantom-Barker sports car. | 30th Aug 1926 | West Wittering \ P \ July1926-September1926 Scan084 | |
| Long-awaited production of a lighter Phantom engine with aluminium cylinders. | 31th Aug 1926 | West Wittering \ P \ July1926-September1926 Scan085 | |
| Modifications and experiments for a sequence starter mechanism, focusing on spiral angles and spring drives. | 1st Sep 1926 | West Wittering \ P \ July1926-September1926 Scan086 | |
| Page two of a memo detailing modifications to a starter motor arrangement to resolve engagement and positioning issues. | 2nd Sep 1926 | West Wittering \ P \ July1926-September1926 Scan087 | |
| Design critique and proposal for a valve seat driver and withdraw tool. | 2nd Sep 1926 | West Wittering \ P \ July1926-September1926 Scan088 | |
| List of modifications for the Sports Phantom 10 EX chassis. | 3rd Sep 1926 | West Wittering \ P \ July1926-September1926 Scan089 | |
| Specification of coachwork modifications for a Barker 'CJ' Sports Phantom on chassis IO.EX. | 4th Sep 1926 | West Wittering \ P \ July1926-September1926 Scan090 | |
| Design and trial of a new triangulated steering column stay for the 20HP model. | 4th Sep 1926 | West Wittering \ P \ July1926-September1926 Scan091 | |
| Steering and low-pressure tyre improvements and related complaints for Phantom and Goshawk models. | 3rd Sep 1926 | West Wittering \ P \ July1926-September1926 Scan092 | |
| Recommending the use of low-pressure tyres for Phantom & Goshawk chassis, detailing the advantages and disadvantages. | 3rd Sep 1926 | West Wittering \ P \ July1926-September1926 Scan093 | |
| Manufacturing methods for special light pistons for the Phantom, comparing sand casting and forging of magnesium alloy. | 3rd Sep 1926 | West Wittering \ P \ July1926-September1926 Scan094 | |
| Revised design for side steering tube springs to increase movement and provide a double rating. | 1st Sep 1926 | West Wittering \ P \ July1926-September1926 Scan095 | |
| Supply and mounting arrangements for wings, valances, and other body parts for a new chassis scheme. | 3rd Sep 1926 | West Wittering \ P \ July1926-September1926 Scan096 | |
| Strengthening of stepirons based on recent complaints and new schemes. | 3rd Sep 1926 | West Wittering \ P \ July1926-September1926 Scan097 | |
| Practicality of bends in a 3rd cross member tube to accommodate tip-up seats. | 3rd Sep 1926 | West Wittering \ P \ July1926-September1926 Scan098 | |
| Modifications to a front shock damper and rubber buffer for scheme 2262. | 19th Sep 1926 | West Wittering \ P \ July1926-September1926 Scan099 | |
| Proposed reduction of the Phantom and 20HP steering ratios by altering the worm gear. | 9th Sep 1926 | West Wittering \ P \ July1926-September1926 Scan100 | |
| Proposed trial of a slower pitch worm gear for the Phantom steering system to address customer complaints. | 4th Sep 1926 | West Wittering \ P \ July1926-September1926 Scan101 | |
| Excessive force required for the India cutout spring and suggesting weaker alternatives. | 4th Sep 1926 | West Wittering \ P \ July1926-September1926 Scan102 | |
| Modifications to the carburetter mixture control levers on the Phantom model to prevent fouling by the bonnet lock. | 9th Sep 1926 | West Wittering \ P \ July1926-September1926 Scan103 | |
| Three materials for pistons, their associated designs, and an issue with piston pin fixing. | 9th Sep 1926 | West Wittering \ P \ July1926-September1926 Scan104 | |
| Listing required modifications for chassis 7-EX. | 13th Sep 1926 | West Wittering \ P \ July1926-September1926 Scan105 | |
| Engine issue of 'popping back' on the Phantom model, diagnosing it as explosions in the silencer. | 13th Sep 1926 | West Wittering \ P \ July1926-September1926 Scan106 | |
| New scheme for a 20HP battery frame stay support, referencing scheme N. 2271. | 15th Sep 1926 | West Wittering \ P \ July1926-September1926 Scan107 | |
| Scheme for mounting a battery in the frame, including details on battery suppliers and electrical connections. | 15th Sep 1926 | West Wittering \ P \ July1926-September1926 Scan108 | |
| Modification to the sheet metal arm of the torque re-action dampers. | 15th Sep 1926 | West Wittering \ P \ July1926-September1926 Scan109 | |
| Modifications to a Phantom pedestal piston made from forged magnesium. | 16th Sep 1926 | West Wittering \ P \ July1926-September1926 Scan110 | |
| From R. to EFC. discussing ignition issues with platinum points at different engine speeds. | 18th Sep 1926 | West Wittering \ P \ July1926-September1926 Scan111 | |
| Adjustments for the Phantom magneto and battery ignition systems, along with a proposed fix for a sticking throttle. | 20th Sep 1926 | West Wittering \ P \ July1926-September1926 Scan112 | |
| Oversight in rear brake cable alignment and the proposed solution. | 21th Sep 1926 | West Wittering \ P \ July1926-September1926 Scan113 | |
| The development of a sequence starter. | 21th Sep 1926 | West Wittering \ P \ July1926-September1926 Scan114 | |
| Directive for the design of hydraulic dampers for steering with an adjustable spring-loaded by-pass valve. | 22th Sep 1926 | West Wittering \ P \ July1926-September1926 Scan115 | |
| Operation and design scheme for a sequence starter unit, including a diagram. | 22th Sep 1926 | West Wittering \ P \ July1926-September1926 Scan116 | |
| Request for investigation and test data on the end pull of a starter motor armature. | 23th Sep 1926 | West Wittering \ P \ July1926-September1926 Scan117 | |
| Ignition timing issues, detonation, and other suggested modifications for the Phantom 10-EX experimental car. | 23th Sep 1926 | West Wittering \ P \ July1926-September1926 Scan118 | |
| New scheme for the Phantom Sequence Starter, referencing drawing LeC. 2298 and patent modifications. | 24th Sep 1926 | West Wittering \ P \ July1926-September1926 Scan119 | |
| Effect of an out-of-centre point on front axle braking and the need for experimentation. | 27th Sep 1926 | West Wittering \ P \ July1926-September1926 Scan120 | |
| Requesting a car with good weather protection for use at 'WW', discussing chassis and model requirements. | 24th Sep 1926 | West Wittering \ P \ July1926-September1926 Scan121 | |
| Stiffening a car's scuttle to prevent jellying and noise when new splashers are fitted. | 25th Sep 1926 | West Wittering \ P \ July1926-September1926 Scan122 | |
| Use of aluminium bronze for valve seats and methods for their installation. | 27th Sep 1926 | West Wittering \ P \ July1926-September1926 Scan123 | |
| Information regarding the properties and use of aluminium bronze for inserted valve seats. | 27th Sep 1926 | West Wittering \ P \ July1926-September1926 Scan124 | |
| Technical note on the performance of the F.10 cross web piston, regarding its cooling and oil control. | 27th Sep 1926 | West Wittering \ P \ July1926-September1926 Scan125 | |
| Solution for hot pistons, proposing a test of a wet liner. | 27th Sep 1926 | West Wittering \ P \ July1926-September1926 Scan126 | |
| Test results for a sequence starter, focusing on armature pull and current characteristics of different windings. | 1st Oct 1926 | West Wittering \ P \ October1926-November1926 Scan001 | |
| Amperage, turns, and frictional effects in a motor winding. | 1st Oct 1925 | West Wittering \ P \ October1926-November1926 Scan002 | |
| Electrical functionality and modifications to the Phantom Sequence Starter No.2 scheme. | 1st Oct 1926 | West Wittering \ P \ October1926-November1926 Scan004 | |
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