| Description | Date | Identifier | |
| Issues with crankshaft dampers, including 'galloping' knock, and exploring alternative materials like woven cotton and Chrysler's rubber ring design. | 14th Jan 1928 | Box 66 \ 4 scan0100 | |
| Investigating and rectifying a knock in engine 7-LP. | 16th Jan 1928 | Box 66 \ 4 scan0101 | |
| The setting of slipper flywheels and their adjustments. | 16th Jan 1928 | Box 66 \ 4 scan0102 | |
| Materials for crankshaft damper friction surfaces and their effect on engine vibration periods. | 1st Feb 1928 | Box 66 \ 4 scan0103 | |
| The Phantom Slipper Flywheel, referencing document LeC. 2520. | 6th Mar 1928 | Box 66 \ 4 scan0104 | |
| Design, materials, and patenting of a corrugated disc drive for a damper flywheel. | 9th Mar 1928 | Box 66 \ 4 scan0105 | |
| Letter to Rolls Royce of America regarding the potential supply and production difficulty of fabric friction discs for damping flywheels. | 16th Mar 1928 | Box 66 \ 4 scan0106 | |
| Testing a Phantom Slipper Wheel with cotton duck friction rings. | 1st Apr 1930 | Box 66 \ 4 scan0107 | |
| Comparing the performance of different slipper wheel fitters over mileage. | 20th Mar 1928 | Box 66 \ 4 scan0108 | |
| Test results comparing slipper flywheels made of Bakelite versus Cotton Duck to address a 'Galloping Knock' on the Phantom model. | 20th Mar 1928 | Box 66 \ 4 scan0109 | |
| Complaints about a material, difficulty sourcing woven cotton duck, and proposed alterations. | 18th Apr 1928 | Box 66 \ 4 scan0110 | |
| Recommending the adoption of a new spring and loading for Phantom Slipper Flywheels following satisfactory testing. | 16th May 1928 | Box 66 \ 4 scan0111 | |
| Request to order two cork washers with specific dimensions for the Phantom slipper wheel. | 1st Jun 1928 | Box 66 \ 4 scan0112 | |
| Request to lighten a pair of standard Phantom slipper wheels according to an attached sketch. | 27th Jul 1928 | Box 66 \ 4 scan0113 | |
| Drive flexibility from the clutch, engine torque effects, and potential flywheel inertia adjustments. | 25th Oct 1928 | Box 66 \ 4 scan0114 | |
| Cancelling the suggestion for cadmium plating on Phantom clutches due to seizing issues and outlining the new procedures. | 23th Nov 1928 | Box 66 \ 4 scan0115 | |
| Report from Melbourne about difficulties with lubrication points, oil egress, and mud ingress on the New Phantom model. | 4th Dec 1928 | Box 66 \ 4 scan0116 | |
| Responding to a letter, discussing issues with the Phantom clutch and the practice of slipping it. | 24th Mar 1929 | Box 66 \ 4 scan0117 | |
| Customer's (Mrs. Taylor) complaint about a noise in car 37-WR, diagnosing it as a transmission oscillation. | 11th May 1929 | Box 66 \ 4 scan0118 | |
| Secret memo regarding the redesign of an EAU engine's exhaust system to accommodate a sequence starter motor. | 29th Nov 1924 | Box 66 \ 4 scan0119 | |
| Modifications to the fabric engine coupling and epicyclic starter gear for the 'V' Series. | 1st Sep 1925 | Box 66 \ 4 scan0120 | |
| Gear design improvements, including teeth lengthening, shaft strength, and bearing choices. | 19th Mar 1925 | Box 66 \ 4 scan0121 | |
| The testing and standardisation of a new fabric coupling for the 40/50 HP car. | 19th Mar 1925 | Box 66 \ 4 scan0122 | |
| The failure of a fabric coupling on a 98-NK car. | 31th Mar 1925 | Box 66 \ 4 scan0123 | |
| Secret memo discussing the failure of a transmission coupling and potential redesigns. | 31th Mar 1925 | Box 66 \ 4 scan0124 | |
| Secret report on the failure of a fabric coupling on car 98-NK after 10,000 miles, detailing the nature of the fractures and discussing design constraints for a replacement. | 31th Mar 1925 | Box 66 \ 4 scan0125 | |
| Analysis of disc and reinforcing plate specifications and an investigation into a component failure. | 31th Mar 1935 | Box 66 \ 4 scan0126 | |
| Failures of 'Alpe' type disc couplings during dynamometer testing and a proposal for their strengthening. | 31th Mar 1925 | Box 66 \ 4 scan0127 | |
| Secret memo regarding a new, stronger fabric engine coupling disc for 'EAC' and methods for making its ferrules. | 1st Apr 1925 | Box 66 \ 4 scan0128 | |
| Technical note discussing design advantages and modifications for a disc assembly, including plates and gearbox housing clearance. | 1st Mar 1925 | Box 66 \ 4 scan0129 | |
| Current status and options for resolving engine coupling and chassis groan issues. | 3rd Apr 1925 | Box 66 \ 4 scan0130 | |
| Use of rubber blocks and the progress on a new design scheme. | 3rd Apr 1925 | Box 66 \ 4 scan0131 | |
| Decoded telegram regarding chassis coupling and component testing issues. | 6th Apr 1925 | Box 66 \ 4 scan0132 | |
| Strength issues and modifications for a gearbox fabric coupling. | 15th Apr 1925 | Box 66 \ 4 scan0133 | |
| Failure of a fabric engine coupling, attributing it to sharp-edged reinforcing plates. | 17th Apr 1925 | Box 66 \ 4 scan0134 | |
| Design for a new chassis with the gearbox attached directly to the engine. | 20th Apr 1925 | Box 66 \ 4 scan0135 | |
| Secret memo requesting comparative results for different sized fabric couplings on a load reversal test rig. | 22th Apr 1925 | Box 66 \ 4 scan0136 | |
| Despatch of two fabric couplings to Mr. Royce at West Wittering for inspection. | 24th Apr 1925 | Box 66 \ 4 scan0137 | |
| Telegram received by telephone regarding failed fabric couplings. | 24th Apr 1925 | Box 66 \ 4 scan0138 | |
| Multiple disc fabric engine coupling sent for comparison testing. | 27th Apr 1925 | Box 66 \ 4 scan0139 | |
| CJ to Hs inquiring about the progress of trials in France regarding over-oiling and fabric coupling. | 28th Apr 1925 | Box 66 \ 4 scan0140 | |
| Secret memorandum discussing the problem of fabric couplings for 40/50 and EAC models, including testing and alternatives. | 28th Apr 1925 | Box 66 \ 4 scan0141 | |
| Design, testing, and stress calculations for a fabric coupling. | 29th Apr 1925 | Box 66 \ 4 scan0142 | |
| Secret memorandum detailing design changes to a fabric engine coupling. | 29th Apr 1925 | Box 66 \ 4 scan0143 | |
| Fabric coupling tests conducted on a joggling rig. | 29th Apr 1925 | Box 66 \ 4 scan0144 | |
| Preliminary report on fabric coupling tests. | 29th Apr 1925 | Box 66 \ 4 scan0145 | |
| Schematic for a joggling rig designed for Hardy Fabrics, including component details and torque calculations. | 4th May 1925 | Box 66 \ 4 scan0146 | |
| The 5,000-mile test of the 'EAC' fabric coupling, comparing its perfect condition to the previous version's failure. | 4th May 1925 | Box 66 \ 4 scan0147 | |
| From AJS to HS regarding the use of an 'Alpé' disc as an engine coupling on an experimental car. | 4th May 1925 | Box 66 \ 4 scan0148 | |
| Test rig for a fabric coupling, including a reference to drawing LeC.2059. | 5th May 1925 | Box 66 \ 4 scan0149 | |
| The durability and lifespan of a fabric coupling after 15,000 miles. | 4th Jun 1925 | Box 66 \ 4 scan0150 | |
| Requesting information on fabric couplings for comparative testing and design purposes. | 1st Jun 1925 | Box 66 \ 4 scan0151 | |
| The testing of a modified, thickened fabric coupling for EAC. | 1st Jun 1925 | Box 66 \ 4 scan0152 | |
| Status of fabric couplings, confirming no immediate changes and outlining conditions for future testing. | 15th Jun 1925 | Box 66 \ 4 scan0153 | |
| Design of an EAC. 7 engine coupling, using three fabric discs with hollow rivets. | 20th Jul 1925 | Box 66 \ 4 scan0154 | |
| Complaint regarding loose bolts on the New Phantom's fabric couplings. | 3rd Dec 1925 | Box 66 \ 4 scan0155 | |
| Instructions on dealing with slack bolts on New Phantom fabric couplings. | 14th Dec 1925 | Box 66 \ 4 scan0156 | |
| Instructions on the method for dealing with slack bolts on New Phantom fabric couplings. | 14th Dec 1925 | Box 66 \ 4 scan0157 | |
| Clarifying a modification to the Phantom I fabric engine coupling, noting a new design had already been issued. | 30th Sep 1930 | Box 66 \ 4 scan0158 | |
| Clarifying a modification to the Phantom 1 fabric engine coupling to prevent misunderstanding. | 30th Sep 1930 | Box 66 \ 4 scan0159 | |
| Parts list for the assembly of chassis 1. E.X. | 30th Jun 1919 | Box 66 \ 4 scan0160 | |
| Customer complaints and proposed solutions regarding the actuation of the reverse gear mechanism. | 16th Mar 1922 | Box 66 \ 4 scan0161 | |
| Clarifying the development priorities between a new 4-speed gearbox, a four-wheel braking system, and various EAC car models. | 22th Jan 1924 | Box 66 \ 4 scan0162 | |
| Secret memorandum discussing production priorities for EAC.IV and EAC.II components. | 1st Jan 1924 | Box 66 \ 4 scan0163 | |
| Progress report on the design and completion status of projects EAC.2 and the new four-speed gearbox EAC.4. | 25th Jan 1924 | Box 66 \ 4 scan0164 | |
| Design work, progress, and resource allocation for engine, gearbox, and chassis components. | 25th Jan 1924 | Box 66 \ 4 scan0165 | |
| Secret memo regarding the production of model EAC.II and a proposal to relocate the starter motor to the engine. | 14th Apr 1924 | Box 66 \ 4 scan0166 | |
| Secret memorandum discussing Mr. Stent's less costly design scheme for a Reverse Pinion 40/50. | 14th Apr 1924 | Box 66 \ 4 scan0167 | |
| Requesting a report on the cause and prevention of seizing reverse pinions on 40/50 HP models during testing. | 3rd Oct 1924 | Box 66 \ 4 scan0168 | |
| Standardisation report for the reverse pinion in the gearbox. | 25th Sep 1924 | Box 66 \ 4 scan0169 | |
| Testing of a new gearbox and potential compatibility issues with a new engine and clutch. | 12th Nov 1924 | Box 66 \ 4 scan0170 | |
| Secret memorandum about the differences and modifications for the EAC.11 gearbox. | 12th Nov 1924 | Box 66 \ 4 scan0171 | |
| Proposed modification to the steering gear-ratio of the 40/50 HP model to reduce driver effort and prevent wobble. | 25th Nov 1924 | Box 66 \ 4 scan0172 | |
| Secret memo regarding the performance and standardisation of a lower geared steering system. | 26th Nov 1924 | Box 66 \ 4 scan0173 | |
| The recurring issue of the 40/50 HP gear box reverse pinion seizing up. | 30th Dec 1924 | Box 66 \ 4 scan0174 | |
| Remedy for the 40/50 HP chassis reverse pinion seizing up by introducing a floating bush. | 31th Dec 1924 | Box 66 \ 4 scan0175 | |
| Cause of a reverse pinion seizing up on a 40/50 HP chassis. | 1st Jan 1925 | Box 66 \ 4 scan0176 | |
| Modifications to the fabric engine coupling and epicyclic starter gear for the 'V' Series. | 1st Jan 1925 | Box 66 \ 4 scan0177 | |
| Modifications to a gear, shaft, and bearing assembly for increased strength and load capacity. | 19th Jan 1925 | Box 66 \ 4 scan0178 | |
| Secret memo regarding a complaint about 'chatter marks' on a 'V' Series Gearbox shaft. | 19th Jan 1925 | Box 66 \ 4 scan0179 | |
| Complaints about the sticky change speed lever on the 'V' series gearbox. | 21th Jan 1925 | Box 66 \ 4 scan0180 | |
| Secret memo on resolving issues with the 40/50 gearbox by supplying a torsionally free pinion. | 1st Mar 1925 | Box 66 \ 4 scan0181 | |
| Secret memorandum discussing the failure of a transmission coupling and considering potential design solutions. | 25th Mar 1931 | Box 66 \ 4 scan0182 | |
| Design modifications and strength improvements for a gearbox fabric coupling. | 15th Apr 1925 | Box 66 \ 4 scan0183 | |
| Design considerations for gearboxes, specifically regarding sliding pinions, splines, and shafts. | 19th Apr 1925 | Box 66 \ 4 scan0184 | |
| Secret memo discussing further work on a new chassis design, with the gearbox attached directly to the engine. | 20th Apr 1925 | Box 66 \ 4 scan0185 | |
| Sticking gear lever on the 'W' Series gearbox and potential modifications. | 6th Jun 1925 | Box 66 \ 4 scan0186 | |
| The 9-PK mock-up chassis and its original gearbox. | 8th Jun 1925 | Box 66 \ 4 scan0187 | |
| Modifications to the body-frame chassis gearbox and change lever shaft. | 8th Jun 1925 | Box 66 \ 4 scan0188 | |
| Modifications to springs, levers, frames, and gearboxes, and answering questions on production status. | 10th Jun 1925 | Box 66 \ 4 scan0189 | |
| Timeline for introducing new parts like side levers and gearcases following a 10,000-mile trial. | 20th Jun 1925 | Box 66 \ 4 scan0190 | |
| Comparing water boiling experiments between the New Phantom and Silver Ghost models, and radiator design. | 20th Jun 1925 | Box 66 \ 4 scan0191 | |
| Improvements to a chassis, focusing on the strength of the front springs and front wheel brakes. | 20th Jun 1925 | Box 66 \ 4 scan0192 | |
| Gearbox modifications concerning the torsionally free double pinion, splines, and gear teeth. | 20th Jun 1925 | Box 66 \ 4 scan0193 | |
| Clearances for a gate, interlock, and sliding gear mechanism. | 29th Jun 1925 | Box 66 \ 4 scan0194 | |
| Modifications to the 'W' series 40/50 gearbox, specifically regarding a new sliding change lever shaft unit. | 29th Jun 1925 | Box 66 \ 4 scan0195 | |
| Alterations to the 'W' series gearbox based on drawing LeC. 2095. | 1st Jul 1925 | Box 66 \ 4 scan0196 | |
| Sending a 9-PK car chassis to Hoopers after a gearbox correction. | 1st Jul 1925 | Box 66 \ 4 scan0197 | |
| Modification to a W. series 40/50 gearbox for the EAC. 7 front suspension scheme. | 2nd Jul 1925 | Box 66 \ 4 scan0198 | |
| Alterations to a W. series 40/50 gearbox to create a rear suspension scheme. | 2nd Jul 1925 | Box 66 \ 4 scan0199 | |
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