| Description | Date | Identifier | |
| Design of the Phantom spare wheel carrier at the rear. | 20th Oct 1927 | West Wittering \ R \ October1927-December1927 Scan048 | |
| Proposing future car model developments, including upgrades for the 20HP and a new 40/120HP. | 1st Oct 1927 | West Wittering \ R \ October1927-December1927 Scan049 | |
| Sending a drawing for Sports Phantom valve springs. | 1st Oct 1927 | West Wittering \ R \ October1927-December1927 Scan050 | |
| Design and supply of a new rear wheel carrier for the Phantom model. | 22th Oct 1927 | West Wittering \ R \ October1927-December1927 Scan051 | |
| Friction on the steering column and improving the geometry for the 20HP model. | 22th Oct 1927 | West Wittering \ R \ October1927-December1927 Scan052 | |
| Improved clutch design adapted for a new crankcase and discussing related components. | 22th Oct 1927 | West Wittering \ R \ October1927-December1927 Scan053 | |
| Correspondence regarding the procurement of two sets of improved dipping headlamps from Messrs Lucas & Co. Ltd. | 22th Oct 1927 | West Wittering \ R \ October1927-December1927 Scan054 | |
| Modifications to the India S. crankshaft for the final Sports Phantom model. | 22th Oct 1927 | West Wittering \ R \ October1927-December1927 Scan055 | |
| New single downtake pipe, exhaust system, and a new slipper flywheel. | 24th Oct 1927 | West Wittering \ R \ October1927-December1927 Scan056 | |
| Letter discussing the principles of lubrication, comparing the merits of different oils and greases, and methods of application. | 24th Oct 1927 | West Wittering \ R \ October1927-December1927 Scan057 | |
| Lubrication methods for crane work and other slow-moving car parts, signed by F. H. Royce. | 24th Oct 1927 | West Wittering \ R \ October1927-December1927 Scan058 | |
| The lightening of a flywheel section for a clutch. | 24th Oct 1927 | West Wittering \ R \ October1927-December1927 Scan059 | |
| Scheme for dowelling the cylinder blocks on the sports chassis engine. | 24th Oct 1927 | West Wittering \ R \ October1927-December1927 Scan060 | |
| Drawing for wheel arch clearance on the Phantom sports chassis. | 25th Oct 1927 | West Wittering \ R \ October1927-December1927 Scan061 | |
| The installation of framed instruments in trial cars for propaganda purposes. | 27th Oct 1927 | West Wittering \ R \ October1927-December1927 Scan062 | |
| Principle of drip plug selection for the centralised chassis lubrication system. | 27th Oct 1927 | West Wittering \ R \ October1927-December1927 Scan063 | |
| Colour scheme, modifications, and pre-delivery inspection of car 14-EX. | 27th Oct 1927 | West Wittering \ R \ October1927-December1927 Scan064 | |
| New schedule for a rear wheel carrier and potential manufacturing materials. | 27th Oct 1927 | West Wittering \ R \ October1927-December1927 Scan065 | |
| Simplifying modifications to the Phantom engine to avoid delays in lowering the chassis. | 28th Oct 1927 | West Wittering \ R \ October1927-December1927 Scan066 | |
| Dispatch of document LeC. 2478, detailing a vacuum pump for petrol feed and wheel-case. | 28th Oct 1927 | West Wittering \ R \ October1927-December1927 Scan067 | |
| Sending schematics for dipping headlamps and informing Messrs Lucas of a slight alteration to the ball end fitting. | 29th Oct 1927 | West Wittering \ R \ October1927-December1927 Scan068 | |
| Provisional British patent suggestions for two different carburetter designs. | 29th Oct 1927 | West Wittering \ R \ October1927-December1927 Scan069 | |
| Modifications to a petrol tank, friction shock damper, and exhaust pipe. | 29th Oct 1927 | West Wittering \ R \ October1927-December1927 Scan070 | |
| Confidential memo on chassis problems regarding acceleration for passing and potential engine improvements. | 31th Oct 1927 | West Wittering \ R \ October1927-December1927 Scan071 | |
| Comparing the tyre removal characteristics of Michelin and Dunlop wheels. | 31th Oct 1927 | West Wittering \ R \ October1927-December1927 Scan072 | |
| Modifications to the brake lever, rear spring, and instruments for the first two Sports Cars. | 31th Oct 1927 | West Wittering \ R \ October1927-December1927 Scan073 | |
| Suggestions for the car for Le Canadel and dealing with 14-EX. | 11th Nov 1927 | West Wittering \ R \ October1927-December1927 Scan074 | |
| Design change note regarding the spare wheel, making a sheet aluminium cover redundant. | 1st Nov 1927 | West Wittering \ R \ October1927-December1927 Scan075 | |
| Design for a rear number plate and tail lamp for a sports car. | 4th Nov 1927 | West Wittering \ R \ October1927-December1927 Scan076 | |
| Axle weights, universal joints, and other chassis components. | 11th Apr 1927 | West Wittering \ R \ October1927-December1927 Scan077 | |
| Drawing for the rear light and numberplate of a Sports car, and a request for lamp-holders. | 5th Nov 1927 | West Wittering \ R \ October1927-December1927 Scan078 | |
| Standardising scrubbing tungsten points and a new spring system for the battery ignition contact maker. | 11th Aug 1927 | West Wittering \ R \ October1927-December1927 Scan079 | |
| Drawing LeC. 2483, detailing modifications to the crankchamber, oil relief unit and gallery pipe. | 9th Nov 1927 | West Wittering \ R \ October1927-December1927 Scan080 | |
| Abandoning a friction scheme in the steering column and proceeding with new experiments. | 9th Nov 1927 | West Wittering \ R \ October1927-December1927 Scan081 | |
| Use and heat treatment of Molybdenum Steel for valve springs. | 10th Nov 1927 | West Wittering \ R \ October1927-December1927 Scan082 | |
| Locating the drive for the revolution counter on the dynamo shaft. | 11th Nov 1927 | West Wittering \ R \ October1927-December1927 Scan083 | |
| 20HP case for Mr. Geoffrey Smith, committing to an outline after the Sports car work is complete. | 11th Nov 1927 | West Wittering \ R \ October1927-December1927 Scan084 | |
| Car springing specifications, axle penetration limits, and target body weight. | 11th Nov 1927 | West Wittering \ R \ October1927-December1927 Scan085 | |
| The process for joining a Sports Phantom oil gallery pipe, favouring sweating over brazing. | 16th Nov 1927 | West Wittering \ R \ October1927-December1927 Scan086 | |
| Responding to three raised points regarding a torque reaction damper rod and countershaft mounting. | 16th Nov 1927 | West Wittering \ R \ October1927-December1927 Scan087 | |
| Proposing an alternative mechanical linkage design using a countershaft and cantilever fixing, with a sketch. | 16th Nov 1927 | West Wittering \ R \ October1927-December1927 Scan088 | |
| Design modifications to the Sports Phantom main bearing caps, requesting original drawings or models. | 16th Nov 1927 | West Wittering \ R \ October1927-December1927 Scan089 | |
| The engine suspension design for the Sports Phantom model, including mounting and detachment procedures. | 16th Nov 1927 | West Wittering \ R \ October1927-December1927 Scan090 | |
| Phantom oil relief valve, instructing to avoid alterations until EAC. 10 is standardised. | 19th Nov 1927 | West Wittering \ R \ October1927-December1927 Scan091 | |
| Standardisation of sheet steel wing stays for mounting headlamps. | 21th Nov 1927 | West Wittering \ R \ October1927-December1927 Scan092 | |
| List of features to be incorporated into a Production Phantom chassis for a 10,000 miles test in France. | 21th Nov 1927 | West Wittering \ R \ October1927-December1927 Scan093 | |
| Page 2 of a numbered list detailing vehicle modifications and improvements. | 21th Nov 1927 | West Wittering \ R \ October1927-December1927 Scan094 | |
| List of 20 features and modifications to be incorporated into the 'India 3' chassis for a 10,000-mile test in France. | 21th Nov 1927 | West Wittering \ R \ October1927-December1927 Scan095 | |
| Numbered list of engine component specifications and updates, page 2. | 22th Nov 1927 | West Wittering \ R \ October1927-December1927 Scan096 | |
| Application of a new rubber rear engine suspension system for EAC.14. | 22th Nov 1927 | West Wittering \ R \ October1927-December1927 Scan097 | |
| Specifications for features to be incorporated into the Production Phantom and Sports Chassis following a 10,000-mile test. | 22th Nov 1927 | West Wittering \ R \ October1927-December1927 Scan098 | |
| Piston design and trials for Phantom and Sports Car models. | 23th Nov 1927 | West Wittering \ R \ October1927-December1927 Scan099 | |
| Requesting a design modification for the placement of wiring connectors for headlamps and wing lamps. | 23th Nov 1927 | West Wittering \ R \ October1927-December1927 Scan100 | |
| Concluding that Molybdenum steel is a safer choice for high-duty components like springs due to its advantages and lack of brittleness. | 24th Nov 1927 | West Wittering \ R \ October1927-December1927 Scan101 | |
| Design and sourcing of worm gears for a new servo drive, comparing potential manufacturers and gear tooth profiles. | 24th Nov 1927 | West Wittering \ R \ October1927-December1927 Scan102 | |
| Requesting the construction of a half-size model of an 'X' shaped frame cross member for torsional stiffness testing. | 25th Nov 1927 | West Wittering \ R \ October1927-December1927 Scan103 | |
| New schemes for the gearbox and clutch casing, noting modifications required and changes to the servo position. | 25th Nov 1927 | West Wittering \ R \ October1927-December1927 Scan104 | |
| Revisions to the crankshaft and connecting rods for models EAC 10 and 14. | 25th Nov 1927 | West Wittering \ R \ October1927-December1927 Scan105 | |
| Confirming the dispatch of drawings for 'Y' metal pistons for EAC. 10 and 14. | 28th Nov 1927 | West Wittering \ R \ October1927-December1927 Scan106 | |
| Improvements to battery ignition systems, specifically tungsten contacts, distributor materials, and porcelain ignition plugs. | 28th Nov 1927 | West Wittering \ R \ October1927-December1927 Scan107 | |
| Design and material for a piston stiffener to prevent engine rattling. | 28th Nov 1927 | West Wittering \ R \ October1927-December1927 Scan108 | |
| Series of proposed engine modifications for the Phantom model to increase power output. | 28th Nov 1927 | West Wittering \ R \ October1927-December1927 Scan109 | |
| The need to encourage lower, lighter, and less wide bodies on 20HP and 40/50 cars to improve performance. | 28th Nov 1927 | West Wittering \ R \ October1927-December1927 Scan110 | |
| Improvements to battery ignition systems and plugs, questioning the quality of English porcelain plugs compared to Champion's. | 28th Nov 1927 | West Wittering \ R \ October1927-December1927 Scan111 | |
| Potential weight reduction on a 20HP chassis by modifying the flywheel, clutch, and engine head. | 28th Nov 1927 | West Wittering \ R \ October1927-December1927 Scan112 | |
| Use of diecast pistons for production Phantom chassis and 'Y' metal pistons for sports models. | 29th Nov 1927 | West Wittering \ R \ October1927-December1927 Scan113 | |
| Provisional patent for a new carburetter design with a diagram. | 30th Nov 1927 | West Wittering \ R \ October1927-December1927 Scan114 | |
| Alternative design for a cast aluminium piston with 'H' webs, including manufacturing suitability. | 30th Nov 1927 | West Wittering \ R \ October1927-December1927 Scan115 | |
| Speedometer drive gear ratio for the EAC.10 gearbox, comparing a sample Smith drive to the provided schematics. | 1st Dec 1927 | West Wittering \ R \ October1927-December1927 Scan116 | |
| Pros and cons of implementing freewheels on cars. | 1st Dec 1927 | West Wittering \ R \ October1927-December1927 Scan117 | |
| Centralised chassis lubrication system, specifically for the front axle control damper and its drip plug. | 1st Dec 1927 | West Wittering \ R \ October1927-December1927 Scan118 | |
| Approving the use of a 7.5' pendulum lever on car EAC. 7, detailing the resulting steering ratio and the intention to standardise it after testing. | 12th Dec 1927 | West Wittering \ R \ October1927-December1927 Scan119 | |
| Casting in aluminium and bronze, focusing on strong and light alloys for components like crankchambers. | 1st Dec 1927 | West Wittering \ R \ October1927-December1927 Scan120 | |
| Suitability and testing of Bosch magnetos for 6-cylinder and 20HP models. | 12th Dec 1927 | West Wittering \ R \ October1927-December1927 Scan121 | |
| Rejection of a dipping headlamp scheme in favour of a heavier, less handy alternative from Barker's. | 2nd Dec 1927 | West Wittering \ R \ October1927-December1927 Scan122 | |
| Suitability and testing of Bosch magnetos for 6-cylinder and 20HP engines. | 12th Dec 1927 | West Wittering \ R \ October1927-December1927 Scan123 | |
| Internal memorandum discussing the tendency for a sequence starter motor to jam and proposing design changes. | 12th Dec 1927 | West Wittering \ R \ October1927-December1927 Scan124 | |
| The design and advantages of a new magnetic switch and starter system compared to other systems. | 2nd Dec 1927 | West Wittering \ R \ October1927-December1927 Scan125 | |
| Trial and patenting of an automatic charge control switch. | 2nd Dec 1927 | West Wittering \ R \ October1927-December1927 Scan126 | |
| Schemes for an 'X' shaped cross member for the 20HP car and related modifications. | 12th Mar 1927 | West Wittering \ R \ October1927-December1927 Scan127 | |
| Requirement for car bodies for 10,000-mile tests on 20HP and 40/50 chassis. | 3rd Dec 1927 | West Wittering \ R \ October1927-December1927 Scan128 | |
| Aluminium bronze for metal mould gravity castings. | 5th Dec 1927 | West Wittering \ R \ October1927-December1927 Scan129 | |
| From 'R' regarding a preference for a valve steel design from DES. 749. | 5th Dec 1927 | West Wittering \ R \ October1927-December1927 Scan130 | |
| Unfinished scheme dealing with the further development of a Phantom direct drive starter motor with push engagement. | 5th Dec 1927 | West Wittering \ R \ October1927-December1927 Scan131 | |
| Arrangement of the front brake differential and clutch operating shaft, and related design modifications. | 7th Dec 1927 | West Wittering \ R \ October1927-December1927 Scan132 | |
| Cracked 'Y' metal pistons and the potential alteration of stiffener designs. | 8th Dec 1927 | West Wittering \ R \ October1927-December1927 Scan133 | |
| Decision not to add vanes to the umbrella rotor for the battery ignition system. | 8th Dec 1927 | West Wittering \ R \ October1927-December1927 Scan134 | |
| Querying the purpose of a second small filler on the EAC.7 gearbox. | 9th Dec 1927 | West Wittering \ R \ October1927-December1927 Scan135 | |
| Pros and cons of different lubricating oils, including compound vs mineral and paraffin vs asphaltum bases. | 9th Dec 1927 | West Wittering \ R \ October1927-December1927 Scan136 | |
| Query about the properties of liquid paraffin as a potential special lubricator for magnetos. | 12th Sep 1927 | West Wittering \ R \ October1927-December1927 Scan137 | |
| The development of battery ignition, discussing contacts, distributors, coil design, and alternative systems. | 12th Sep 1927 | West Wittering \ R \ October1927-December1927 Scan138 | |
| Alternative methods for lubricating a piston pin and little end bush, proposing drilling holes for experimental sets. | 9th Dec 1927 | West Wittering \ R \ October1927-December1927 Scan139 | |
| Modifications to the 20HP crankshaft and connecting rod. | 10th Dec 1927 | West Wittering \ R \ October1927-December1927 Scan140 | |
| Modifications to a cross web piston design, specifically web weight and piston pin lubrication. | 13th Dec 1927 | West Wittering \ R \ October1927-December1927 Scan141 | |
| The rear spring front anchorage for the 'India 3' model, referencing a new forging. | 14th Dec 1927 | West Wittering \ R \ October1927-December1927 Scan142 | |
| Provision of a countershaft for dipping head light control, including modifications to the bell crank and engine foot. | 14th Dec 1927 | West Wittering \ R \ October1927-December1927 Scan143 | |
| Blueprint of the first rough drawing for a new chassis carburetter. | 17th Dec 1927 | West Wittering \ R \ October1927-December1927 Scan144 | |
| Sending drawings LeCs. 2491 & 2497 for an oil sump filter and oil level indicator, requesting they be checked for alterations. | 17th Dec 1927 | West Wittering \ R \ October1927-December1927 Scan145 | |
| The dispatch of schematics for an India 3 model brake linkage layout. | 20th Dec 1927 | West Wittering \ R \ October1927-December1927 Scan146 | |
| Dynamo drive options, suggesting the serrated drive as a temporary solution due to time constraints. | 24th Jan 1928 | West Wittering \ R \ October1927-December1927 Scan147 | |
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