| Description | Date | Identifier | |
| Unsatisfactory performance of the servo unless fitted with a spring thrust collar and issues with brake bedding. | 29th Apr 1927 | Box 67 \ 1 scan0064 | |
| Testing and poundage requirements for a 'Phantom' servo swinging link with a spring-loaded friction device. | 4th May 1927 | Box 67 \ 1 scan0065 | |
| Front brake snatch due to variation in the condition of brake linings on F.W.B. axles. | 10th May 1927 | Box 67 \ 1 scan0066 | |
| Technical memorandum responding to remarks about a braking system, explaining its operation and modifications. | 31th Oct 1927 | Box 67 \ 1 scan0067 | |
| Technical memorandum discussing a difficulty with the 40/50 HP servo and front equaliser shaft, including diagrams of lever movements. | 2nd Feb 1927 | Box 67 \ 1 scan0068 | |
| Fault analysis on front brake snatching and thumps, proposing a modification to the T-piece linkage. | 2nd Feb 1927 | Box 67 \ 1 scan0069 | |
| Diagram with notes explaining the operation of a 40/50 swinging link for the braking system. | 29th Nov 1927 | Box 67 \ 1 scan0070 | |
| The handover of a brake patent matter to an individual familiar with American patents. | 29th Nov 1927 | Box 67 \ 1 scan0071 | |
| Calculation of the torque required on the 40/50 servo gears for a limousine car. | 14th Dec 1927 | Box 67 \ 1 scan0072 | |
| Scheme for fitting a friction device to servo pendulum links. | 27th Aug 1928 | Box 67 \ 1 scan0073 | |
| Examining a modified swinging arm for a Phantom, recommending a test fit on a car before approval. | 30th Aug 1928 | Box 67 \ 1 scan0074 | |
| Response to a Mr. Speid's query about the servo mechanical brake system. | 31th Oct 1928 | Box 67 \ 1 scan0075 | |
| Letter requesting information on servo braking systems for a paper to be read to the I.A.E. | 28th Oct 1928 | Box 67 \ 1 scan0076 | |
| Letter declining to provide details on experimental servo mechanisms and explaining issues with oil pump servos. | 2nd Nov 1928 | Box 67 \ 1 scan0077 | |
| Standardisation of a friction device on the servo swinging arm for the Phantom model to resolve customer complaints of thumping. | 20th Sep 1928 | Box 67 \ 1 scan0078 | |
| Quantity of Bracket F.3730 needed for the E.A.C.II military order chassis. | 31th Oct 1923 | Box 67 \ 1 scan0079 | |
| Use of spring washers on frame fittings and Grover washers for the back axle. | 4th Jul 1924 | Box 67 \ 1 scan0080 | |
| Querying whether future chassis production with a new engine will incorporate the updated bonnet and frame design shown in drawings by West Wittering. | 1st Aug 1924 | Box 67 \ 1 scan0081 | |
| Desirable alterations to the EAC.11 chassis frame and its impact on coachbuilders. | 20th Aug 1924 | Box 67 \ 1 scan0082 | |
| New, stiffer, and raised step iron design, alongside an alternative Sports step iron. | 21th Aug 1924 | Box 67 \ 1 scan0083 | |
| Modifications to the front cross member and radiator suspension. | 1st Sep 1924 | Box 67 \ 1 scan0084 | |
| Fitting a fabric type coupling to an EAC.11 car and a recommendation for a sub-frame scheme. | 13th Oct 1924 | Box 67 \ 1 scan0085 | |
| Page discussing body and engine noises, with recommendations for sub-frame mounting and further experiments on the EAC.11. | 13th Oct 1924 | Box 67 \ 1 scan0086 | |
| Fitting a covered Saloon body to model EAC.11, requiring the design of a sub-frame. | 24th Oct 1924 | Box 67 \ 1 scan0087 | |
| Secret memo regarding the body sub-frame for a 4-door limousine, model EAC.11. | 11th Nov 1924 | Box 67 \ 1 scan0088 | |
| Secret internal memorandum regarding the design and mounting of bodies on subframes. | 11th Nov 1924 | Box 67 \ 1 scan0089 | |
| And comparing different coachbuilt bodies for testing, including a Barker and a Hooper. | 14th Nov 1924 | Box 67 \ 1 scan0090 | |
| Query about the expected readiness of the first supplementary frame for which car bodies are waiting. | 14th Nov 1924 | Box 67 \ 1 scan0091 | |
| Completion of sub-frame designs for a chassis with a wider dashboard and new side levers. | 18th Nov 1924 | Box 67 \ 1 scan0092 | |
| From Hs. to C. regarding the readiness of the first supplementary frame. | 18th Nov 1924 | Box 67 \ 1 scan0093 | |
| Containing the text of a telegram regarding subframe and chassis frame specifications. | 19th Nov 1924 | Box 67 \ 1 scan0094 | |
| Inquiry about the timeline for modifications to the 40/50 chassis frame. | 17th Apr 1912 | Box 67 \ 1 scan0095 | |
| Chassis type for experimental Limousine and Cabriolet bodies to finalize subframe designs. | 17th Nov 1924 | Box 67 \ 1 scan0096 | |
| Technical memo discussing the design and implementation of body sub-frames, floorboards, and scuttle isolation for the 40/50 model. | 22th Nov 1924 | Box 67 \ 1 scan0097 | |
| Page ending a statement about suiting the underframe. | 13th Dec 1924 | Box 67 \ 1 scan0098 | |
| Letter asking for information about fitting a sub-frame to a 'W' series chassis and proposing to test a new Celluluse paint system. | 13th Dec 1924 | Box 67 \ 1 scan0099 | |
| Secret internal memorandum regarding the supply of a sub-frame and chassis to coachbuilders for a special 40/50 model. | 15th Dec 1924 | Box 67 \ 1 scan0100 | |
| Fitting of a body to a supplementary frame, dashboard specifications, and painting arrangements. | 16th Dec 1924 | Box 67 \ 1 scan0101 | |
| Modifications to a 40/50 HP chassis, specifically fitting a wider dashboard and raised radiator for a body subframe. | 17th Dec 1924 | Box 67 \ 1 scan0102 | |
| The preparation and supply of a sub-frame for the EAC to coachbuilders. | 19th Dec 1924 | Box 67 \ 1 scan0103 | |
| The decision not to send a special chassis for a sub-frame for E.A.C. | 22th Dec 1924 | Box 67 \ 1 scan0104 | |
| Design and production of a body sub-frame for the 40/50 HP 'E' Series with coachbuilder Hoopers. | 31th Dec 1924 | Box 67 \ 1 scan0105 | |
| Secret memo regarding the preparation of a sub-frame for an EAC 'W' series chassis. | 31th Dec 1924 | Box 67 \ 1 scan0106 | |
| Secret memo from Hs. to CJ. regarding tests on a new sub-frame for the 'W' series and 20 HP models. | 31th Dec 1924 | Box 67 \ 1 scan0107 | |
| Secret memo discussing the completion and fitting of a 'W' series body subframe. | 1st Jan 1925 | Box 67 \ 1 scan0108 | |
| Logistics of fitting a supplementary frame to a chassis to assist coachbuilders with camouflaging. | 1st Jan 1925 | Box 67 \ 1 scan0109 | |
| Plan for fitting a limousine body from Hoopers using a supplementary frame on a modified chassis. | 21th Dec 1924 | Box 67 \ 1 scan0110 | |
| Over-cooling issues, particularly for doctors, and proposing an experimental exhaust box and new exhaust pipe routing. | 24th Oct 1930 | Box 67 \ 1 scan0111 | |
| Challenges and suggestions for building a 'W' series body on a 40/50 chassis subframe. | 3rd Jan 1925 | Box 67 \ 1 scan0112 | |
| Confirming the despatch of an 'EAC' 'W' series subframe to Messrs. Hoopers. | 7th Jan 1925 | Box 67 \ 1 scan0113 | |
| Secret memo regarding instructions for the Repair Department to fit a higher radiator and bonnet for the 'W' series subframe. | 9th Jan 1925 | Box 67 \ 1 scan0114 | |
| Secret internal memo discussing complaints about a sticking change speed lever on the 'V' series gearbox with subframe. | 21th Jan 1925 | Box 67 \ 1 scan0115 | |
| Secret memo regarding the revised body subframe for the 40/50 model, outlining modifications and requirements for various chassis. | 27th Jan 1925 | Box 67 \ 1 scan0116 | |
| Secret memo regarding the procurement of car bodies from various coachbuilders for underframe experiments. | 2nd Feb 1925 | Box 67 \ 1 scan0117 | |
| Secret memo about the procurement of car bodies and subframes from various suppliers for experimental purposes. | 5th Feb 1925 | Box 67 \ 1 scan0118 | |
| Confirmation of a wire message requesting two subframes for Barkers within fourteen days. | 5th Feb 1925 | Box 67 \ 1 scan0119 | |
| Confirmation of a telegraph requesting two subframes for different chassis types. | 17th Feb 1925 | Box 67 \ 1 scan0120 | |
| Improved design and manufacturing process for a change speed lever shaft. | 17th Feb 1925 | Box 67 \ 1 scan0121 | |
| Binding issue with a change speed lever shaft's bronze bush and proposing a new design using a steel bush. | 7th Feb 1925 | Box 67 \ 1 scan0122 | |
| The progress on subframes for Messrs. Barkers and a delay on car 9-PK awaiting modification instructions. | 2nd Feb 1925 | Box 67 \ 1 scan0123 | |
| Instruction memo for work to be carried out on Chassis 46-PK by Messrs. Sanderson & Holmes Ltd. | 26th Feb 1925 | Box 67 \ 1 scan0124 | |
| Secret internal memo urging progress on new side levers and the construction of a light cabriolet body on a steel underframe. | 3rd Mar 1925 | Box 67 \ 1 scan0125 | |
| Secret memo about mounting Barker and Hooper bodies on chassis 9-PK and planning for future chassis modifications. | 18th Mar 1925 | Box 67 \ 1 scan0126 | |
| Fouling issue encountered when mounting a 'B' steering limousine body on a subframe on chassis 9-PK. | 6th May 1925 | Box 67 \ 1 scan0127 | |
| The temporary cancellation of a 'Duco' finished body due to delays with a subframe experiment. | 11th May 1925 | Box 67 \ 1 scan0128 | |
| Six alterations to the 40/50 Subframe 'W' Series for production suitability. | 13th May 1925 | Box 67 \ 1 scan0129 | |
| Revised forward support for the 40/50 subframe 'W' series. | 13th May 1925 | Box 67 \ 1 scan0130 | |
| Modifications to the side lever mechanism and subframe for the 40/50 HP chassis. | 13th May 1925 | Box 67 \ 1 scan0131 | |
| Authorization sheet discussing a modification to wing fittings to resolve an assembly issue. | 29th May 1925 | Box 67 \ 1 scan0132 | |
| Authorisation sheet for modifying the front wing socket mounting from rivets to bolts on 'V' Series chassis. | 4th Jun 1925 | Box 67 \ 1 scan0133 | |
| Gearbox fault where the lever sticks in neutral and potential modifications to the plunger mechanism. | 6th Jun 1925 | Box 67 \ 1 scan0134 | |
| Stronger springs, improved levers, sub-frame standardization, and gearbox production status. | 10th Jun 1925 | Box 67 \ 1 scan0135 | |
| Responding to questions about manufacturing timelines and material ordering for new parts like side levers and gearcases, pending a 10,000-mile trial. | 10th Jun 1925 | Box 67 \ 1 scan0136 | |
| Car 9-PK modifications, urgent subframe testing for 40/50 & 20.HP models, and plans for a 10,000-mile trial. | 10th Jun 1925 | Box 67 \ 1 scan0137 | |
| Schedule for introducing a new sub-frame and gearbox for the 'X' Series, balancing trial requirements and production timelines. | 15th Jun 1925 | Box 67 \ 1 scan0138 | |
| Authorisation sheet proposing a modification to secure the front mud wing socket with bolts and a locking plate instead of rivets. | 13th Jun 1925 | Box 67 \ 1 scan0139 | |
| Instructions for issuing a locking plate to secure the rear socket for the front mud wings on a 40/50 HP chassis. | 23th Jun 1925 | Box 67 \ 1 scan0140 | |
| Requesting the supply of various instruments for a double enclosed limousine body intended for a New Phantom chassis. | 18th Jul 1925 | Box 67 \ 1 scan0141 | |
| Production delays for subframe bodies at the coachbuilder Barkers. | 26th Aug 1925 | Box 67 \ 1 scan0142 | |
| Progress and logistics of various chassis and body builds with coachbuilder Barkers. | 19th Sep 1925 | Box 67 \ 1 scan0143 | |
| Confirmation of a telegram regarding a hold-up with Barkers on the India subframe, awaiting rubber suspension blocks. | 29th Sep 1925 | Box 67 \ 1 scan0144 | |
| List of modifications for the 'Z' Series and the next car for France, covering steering, axle, brakes, and other components. | 10th Jun 1925 | Box 67 \ 1 scan0145 | |
| List of technical specifications for various vehicle components, including levers, wing stays, headlamps, and shock dampers. | 10th Oct 1925 | Box 67 \ 1 scan0146 | |
| Secret memo from CWB to S/W (Hs) regarding alterations for a 'Phantom' car for a 10,000-mile trial. | 10th Oct 1925 | Box 67 \ 1 scan0147 | |
| Letter from the American branch to the UK branch acknowledging correspondence about a Body Subframe. | 9th Nov 1925 | Box 67 \ 1 scan0148 | |
| Chassis frame stiffness, tie-rod testing, and gearbox design considerations for different models. | 18th Nov 1925 | Box 67 \ 1 scan0149 | |
| Broken front body bolts on an 8-EX car and a failed luggage grid. | 23th Nov 1925 | Box 67 \ 1 scan0150 | |
| Requesting an experiment to modify frame tie-bars according to Mr. Royce's wishes. | 26th Nov 1925 | Box 67 \ 1 scan0151 | |
| Requesting further information on the failure of subframe holding down bolts and mentioning a luggage grid. | 26th Nov 1925 | Box 67 \ 1 scan0152 | |
| Failure of body subframe bolts due to chafing and a proposed modification with a diagram. | 30th Nov 1925 | Box 67 \ 1 scan0153 | |
| Proposed modification to 'AA' Series frame side members for cost-saving purposes. | 2nd Dec 1925 | Box 67 \ 1 scan0154 | |
| Calculations on frame distortion, specifically the twisting of side and cross members, and its potential effect on steering. | 4th Dec 1925 | Box 67 \ 1 scan0155 | |
| The failure of bolts holding the front end of a Phantom subframe. | 8th Dec 1925 | Box 67 \ 1 scan0156 | |
| Blueprint showing a cross-section of a bolted component, with a handwritten note indicating a failure point. | 9th Dec 1925 | Box 67 \ 1 scan0157 | |
| Extract from a Sales Conference minute discussing the necessity of a chassis underframe, referencing the New Phantom and competitors' issues. | 16th Dec 1925 | Box 67 \ 1 scan0158 | |
| Expressing concerns and recommending a cautious approach to adopting a new chassis underframe. | 21th Dec 1925 | Box 67 \ 1 scan0159 | |
| Urgent internal memo regarding the preparation and supply of Phantom car bodies for specific chassis. | 1st Jan 1926 | Box 67 \ 1 scan0160 | |
| Abandonment of the subframe on cantilever sprung cars and focusing on the EAC.7 frame with semi-elliptic springs. | 19th Jan 1926 | Box 67 \ 1 scan0161 | |
| Standardisation of chassis side members with an extension for the luggage grid and joggle moved 1' further back. | 12th Dec 1925 | Box 67 \ 1 scan0162 | |
| Broken off-side chassis frame on an 8-EX car after 14,831 miles. | 1st Jan 1926 | Box 67 \ 1 scan0163 | |
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