| Description | Date | Identifier | |
| Test report detailing the performance and issues with various engine components. | 17th Mar 1928 | Box 12 \ 3 X704-0103 | |
| Test report on the condition and performance of various vehicle components. | 17th Mar 1928 | Box 12 \ 3 X704-0104 | |
| Continued report on component performance including a filter, magneto, ignition, oil valve, pump, fan, and clutch. | 17th Mar 1928 | Box 12 \ 3 X704-0105 | |
| Performance and condition report of various vehicle components after testing. | 17th Mar 1928 | Box 12 \ 3 X704-0106 | |
| Test report detailing observations on brake linings, axles, springs, and the petrol tank. | 17th Mar 1928 | Box 12 \ 3 X704-0107 | |
| Loose spare wheel carrier, cracked dashbrackets, and significant steering column issues requiring modifications. | 17th Mar 1928 | Box 12 \ 3 X704-0108 | |
| Test report detailing adjustments and performance of steering, hydraulic dampers, and ignition components. | 17th Mar 1928 | Box 12 \ 3 X704-0109 | |
| The performance of various electrical components including the distribution board, charge control switch, dynamo, and lighting system. | 17th Mar 1928 | Box 12 \ 3 X704-0110 | |
| Faults found in the battery, scuttle damper, and various bodywork components. | 17th Mar 1928 | Box 12 \ 3 X704-0111 | |
| Test report detailing issues with a vehicle's bodywork, including windscreen, hood, locks, and seating. | 19th Mar 1928 | Box 12 \ 3 X704-0112 | |
| Dispatch of parts to Jarvis, a delay due to a visit, and the effectiveness of Barker vs. Hooper car wings. | 19th Mar 1928 | Box 12 \ 3 X704-0113 | |
| Letter discussing three different proposed car body designs for a new 'SS' chassis, covering sports and cabriolet types. | 23th Mar 1928 | Box 12 \ 3 X704-0114 | |
| Future vehicle improvements including rubber body mountings, headlight schemes, and instrument grouping. | 27th Mar 1928 | Box 12 \ 3 X704-0115 | |
| Replacement of weak forward body support springs. | 27th Mar 1928 | Box 12 \ 3 X704-0116 | |
| Performance and structural issues of a sports car body after testing and a crash. | 29th Mar 1928 | Box 12 \ 3 X704-0117 | |
| From Ev. to Hs. regarding the design and production plan for bodies for the E.A.C.IO. and India 3 chassis. | 13th Apr 1928 | Box 12 \ 3 X704-0118 | |
| Instruction sheet to issue a number for laying various joints on a carburettor air valve suction chamber. | 29th Aug 1913 | Box 12 \ 4 04-page01 | |
| Requesting tests on special washers for a suction chamber to prevent seizing due to moisture absorption. | 10th Sep 1913 | Box 12 \ 4 04-page02 | |
| To Mr Hives regarding testing of new materials for suction chamber washers due to swelling issues. | 10th Sep 1913 | Box 12 \ 4 04-page03 | |
| Internal instruction to the Order Department to manufacture various types of washers. | 10th Sep 1913 | Box 12 \ 4 04-page04 | |
| Departmental memo regarding the availability of C.A. washers for a shock absorber experiment, with subsequent handwritten queries and clarifications. | 29th Sep 1913 | Box 12 \ 4 04-page05 | |
| Expressing frustration with the Drawing Office over a 12-month delay on a suction chamber job. | 19th Jan 1914 | Box 12 \ 4 04-page06 | |
| Chasing an overdue report on an experiment with special material washers for a carburettor suction chamber joint. | 19th Feb 1914 | Box 12 \ 4 04-page07 | |
| Request for a report on alternative suction chamber washers with a handwritten response questioning the need for a change. | 19th Feb 1914 | Box 12 \ 4 04-page08 | |
| Departmental memo about issues with suction chamber washers becoming tight on carburettors and proposed experiments. | 23th Feb 1914 | Box 12 \ 4 04-page09 | |
| Departmental memo discussing the necessity of a washer for the suction chamber and air valve assembly. | 23th Feb 1914 | Box 12 \ 4 04-page10 | |
| Note about suction chambers swelling due to moisture, making them difficult to remove without causing damage. | 26th Feb 1914 | Box 12 \ 4 04-page11 | |
| Second application memo to Mr Hives requesting a report on special joint washers for a carburetter. | 11th Mar 1914 | Box 12 \ 4 04-page12 | |
| With a received date stamp. | 13th Mar 1914 | Box 12 \ 4 04-page13 | |
| Testing different washer materials, such as lead, copper and asbestos, for air valves. | 13th Mar 1914 | Box 12 \ 4 04-page14 | |
| Suggestion to improve the air valve with a wire locking ring to prevent it from causing running issues. | 13th Mar 1914 | Box 12 \ 4 04-page15 | |
| Internal memorandum concerning an experiment on air valve washers that swell from mixture absorption, causing removal difficulties. | 13th Mar 1914 | Box 12 \ 4 04-page16 | |
| Use of fibre washers versus ebonite washers for air valves. | 1st Apr 1914 | Box 12 \ 4 04-page17 | |
| Extract concerning a 10,000-mile engine final test on an ebonite suction chamber washer. | 18th May 1914 | Box 12 \ 4 04-page18 | |
| Record of a suction chamber washer fitted to chassis 58NA. | 26th May 1914 | Box 12 \ 4 04-page19 | |
| Request for final reports on a list of experiments to be delivered without fail. | 27th Jul 1914 | Box 12 \ 4 04-page20 | |
| Instruction memo regarding suction chamber washers and the completion of an order. | 28th Jul 1914 | Box 12 \ 4 04-page21 | |
| The trial of ebonite washers as a replacement for fibre ones under an air valve. | 28th Jul 1914 | Box 12 \ 4 04-page22 | |
| Testing of different materials for suction chamber washers. | 29th Jul 1914 | Box 12 \ 4 04-page23 | |
| Blank divider page with the number 706 written at the top. | 1st Sep 1913 | Box 12 \ 4 04-page24 | |
| Instruction sheet regarding the need for an experimental number for light connecting rods. | 1st Sep 1913 | Box 12 \ 4 04-page25 | |
| Confirming verbal instruction for milling H-sections on con-rods. | 30th Jul 1913 | Box 12 \ 4 04-page26 | |
| Instructions and queries regarding experimental work on chassis 2100E, involving axles, brakes, connecting rods, and pistons. | 12th Nov 1913 | Box 12 \ 4 04-page27 | |
| Continuing work on light connecting rods for testing patented light steel pistons. | 14th Nov 1913 | Box 12 \ 4 04-page28 | |
| Instruction from Mr. Royce to test and complete light connecting rods made of white metal instead of brasses. | 18th Nov 1913 | Box 12 \ 4 04-page29 | |
| Note detailing that Light Connecting Rods were fitted to chassis 2100 E. | 24th Nov 1913 | Box 12 \ 4 04-page30 | |
| Production status of seven light connecting rods without brasses. | 30th Dec 1913 | Box 12 \ 4 04-page31 | |
| Replying to E3/P 30.12.13, stating that Light Connecting Rods are in hand and a specimen will be sent to Mr Royce. | 2nd Jan 1914 | Box 12 \ 4 04-page32 | |
| Light connecting rod sent as a specimen, noting an incorrect milling. | 14th Jan 1914 | Box 12 \ 4 04-page33 | |
| Instructions regarding a connecting rod for Mr. Royce, noting a milling defect. | 14th Jan 1914 | Box 12 \ 4 04-page34 | |
| Testing connecting rods with novel steel pistons, which was stopped due to an electric dynamometer fault. | 6th Mar 1914 | Box 12 \ 4 04-page35 | |
| Connecting rod failure during engine testing and proposing further stress tests. | 7th Mar 1914 | Box 12 \ 4 04-page36 | |
| Urgent internal request for a connecting rod for chassis 2100E, delayed due to a missing drawing. | 10th Mar 1914 | Box 12 \ 4 04-page37 | |
| Overheating issues with novel steel pistons where solder melted on the oil pipe during a bench test. | 11th Mar 1914 | Box 12 \ 4 04-page38 | |
| Instructions to dispatch a connecting rod for urgent copper plating. | 23th Mar 1914 | Box 12 \ 4 04-page39 | |
| Notification that Connecting Rod E.3486 has been copper-plated at the large end and is available from the Stores. | 7th Apr 1914 | Box 12 \ 4 04-page40 | |
| Record of a connecting rod replacement fitted to car 2100R. | 9th Apr 1914 | Box 12 \ 4 04-page41 | |
| Technical drawing illustrating axle torsional movement and its effect on brake pedal travel. | 26th Jan 1926 | Box 12 \ 5 05-page001 | |
| Suggestions for double rear brake schemes and camshaft arrangements. | 26th Jan 1926 | Box 12 \ 5 05-page002 | |
| Outlining design points and improvements for rear brakes on a Phantom model. | 2nd Mar 1926 | Box 12 \ 5 05-page003 | |
| Design schemes for a supporting pin and drum, with references to sketches. | 8th Feb 1926 | Box 12 \ 5 05-page004 | |
| Design improvements for a rear brake system. | 8th Feb 1926 | Box 12 \ 5 05-page005 | |
| The design of double rear brakes, incorporating initial suggestions and awaiting further remarks before proceeding with detailing. | 11th Mar 1926 | Box 12 \ 5 05-page006 | |
| Mr. Royce's instruction to fit the first EAC.7 model with existing New Phantom double rear brakes. | 11th Mar 1926 | Box 12 \ 5 05-page007 | |
| The collection and fitting of new Dunlop rear hubs for a 10,000-mile trial. | 11th Jun 1926 | Box 12 \ 5 05-page008 | |
| Modifications to rear brake operating gear and frame gussets for the fitment of hydraulic shock dampers. | 23th Jul 1926 | Box 12 \ 5 05-page009 | |
| Modifications to the EAC-7 rear brakes, including the camshaft, toggle gear, and a new method of cutting cams. | 23th Jul 1926 | Box 12 \ 5 05-page010 | |
| Alterations to the rear brake differential mounting and related components like the servo pull and hand brake lever. | 27th Aug 1926 | Box 12 \ 5 05-page011 | |
| Modifications for the servo stop and brake linkage arrangement. | 27th Aug 1926 | Box 12 \ 5 05-page012 | |
| Modifications to the Phantom servo brake gear to prevent the balancing lever pin fouling the suspension link. | 27th Aug 1926 | Box 12 \ 5 05-page013 | |
| Oversight regarding the alignment of rear brake cables and the accompanying solution. | 21th Sep 1926 | Box 12 \ 5 05-page014 | |
| Issue of squeaking front brakes on cars fitted with a new lightened axle. | 21th Sep 1926 | Box 12 \ 5 05-page015 | |
| Modifications to the servo linkage and hand brake lever assembly. | 2nd Oct 1926 | Box 12 \ 5 05-page016 | |
| Summary of tests carried out on front wheel brakes fitted on model 12-EX to overcome squeaks. | 20th Oct 1926 | Box 12 \ 5 05-page017 | |
| Brake squeaking, suggesting a damping arrangement fitted to the drums as a solution. | 20th Oct 1926 | Box 12 \ 5 05-page018 | |
| Proposal for a scheme to fit dampers to front brake drums on a new lightened axle to eliminate squeaking. | 20th Oct 1926 | Box 12 \ 5 05-page019 | |
| Investigation into why new, lighter front brakes fitted to axle G.74294 are more prone to squeaking. | 25th Oct 1926 | Box 12 \ 5 05-page020 | |
| Summary of tests carried out to overcome squeaks from front brakes fitted to the 12-EX model. | 25th Oct 1926 | Box 12 \ 5 05-page021 | |
| Proposal to modify clearances on Phantom front brakes to reduce side movement and prevent rattle. | 27th Oct 1926 | Box 12 \ 5 05-page022 | |
| Solutions for squeaking brakes on the 40/50 HP model, and the resulting problem of 'axle jaggers'. | 23th Nov 1926 | Box 12 \ 5 05-page023 | |
| Corrections and suggestions for the brake operation on the EAC-7 chassis. | 16th Dec 1926 | Box 12 \ 5 05-page024 | |
| Investigation into lost brake pedal movement during braking on the EAC-V11 model. | 28th Jan 1927 | Box 12 \ 5 05-page025 | |
| Analysis of lost pedal movement in the rear axle brake linkage, including a data table and diagram. | 28th Jan 1927 | Box 12 \ 5 05-page026 | |
| Test report comparing pedal travel loss in the rear axle linkage for the 40/50 HP and EAC.V11 models. | 28th Apr 1930 | Box 12 \ 5 05-page027 | |
| Analysis of the EAC.VII axle's flexibility, twist under braking torque, and lost movement due to elasticity. | 28th Apr 1930 | Box 12 \ 5 05-page028 | |
| Test results and design considerations for front wheel brake torsional pull-off springs. | 31th Jan 1927 | Box 12 \ 5 05-page029 | |
| Unsatisfactory friction arrangement on the EAC.V11 servo linkage, noting an underperforming spring. | 24th Feb 1927 | Box 12 \ 5 05-page030 | |
| Braking performance, axle behaviour, road hopping, and the need for improved damping. | 12th Mar 1927 | Box 12 \ 5 05-page031 | |
| Tests conducted on the EAC.V11 braking system to improve rigidity and address rear axle instability during rapid stops. | 7th Mar 1927 | Box 12 \ 5 05-page032 | |
| Friction and load characteristics of the EAC.7 servo linkage. | 21th Mar 1927 | Box 12 \ 5 05-page033 | |
| Suggestions to reduce sponginess and improve the EAC.7 brakes. | 25th Mar 1927 | Box 12 \ 5 05-page034 | |
| Complaint of insufficient friction in the servo linkage by supplying a new square wire spring. | 4th Apr 1927 | Box 12 \ 5 05-page035 | |
| Modifications to the brake camshafts to improve stiffness and reduce weight. | 5th May 1927 | Box 12 \ 5 05-page036 | |
| Stiffening camshafts to reduce sponginess in the rear brakes for the EAC.7 model. | 5th Mar 1927 | Box 12 \ 5 05-page037 | |
| Modification to address sponginess in the EAC.7 rear brakes. | 9th May 1927 | Box 12 \ 5 05-page038 | |
| Seeking criticism on a proposed modification for all-metal covers for brake actuating shafts. | 25th Aug 1927 | Box 12 \ 5 05-page039 | |
| Recommending the standardisation of a metal dust cover for Phantom rear brake actuating shafts. | 27th Aug 1927 | Box 12 \ 5 05-page040 | |
| The sending of two new rear brake pull off springs with reduced power. | 12th Sep 1927 | Box 12 \ 5 05-page041 | |
| The revised rear brake gear for the Phantom Sports car models X.8360 and X.7360. | 8th Oct 1927 | Box 12 \ 5 05-page042 | |
| Dispatch of drawings for the clutch pit, front brake differential, and operating shaft. | 7th Dec 1927 | Box 12 \ 5 05-page043 | |
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