| Description | Date | Identifier | |
| Recommendation to adopt a new jack from Tangye for the 20 HP chassis, as the previous supplier, Michelin, has ceased production. | 31th Jan 1929 | Box 52 \ 4 Scan013 | |
| Feedback and modification suggestions for a Tangye Jack intended for the 20 HP Chassis. | 6th Feb 1929 | Box 52 \ 4 Scan014 | |
| Feedback and proposed modifications for a Tangye Jack for the 20 HP Chassis. | 6th Feb 1929 | Box 52 \ 4 Scan015 | |
| Sales feedback and proposed modifications for a 20 HP Tangye jack. | 7th Feb 1929 | Box 52 \ 4 Scan016 | |
| Design preferences for a jack's joint and handle, prioritizing production due to urgency. | 14th Feb 1929 | Box 52 \ 4 Scan017 | |
| Inquiry regarding the introduction date of a modified Tangye Jack for the 20 HP Chassis. | 14th Feb 1929 | Box 52 \ 4 Scan018 | |
| Query regarding the introduction date for the Tangye Jack for the 20 HP Chassis. | 14th Feb 1929 | Box 52 \ 4 Scan019 | |
| Letter forwarding a quotation from Messrs. Tangyes for a wheel jack for the 20-HP chassis. | 18th Feb 1929 | Box 52 \ 4 Scan020 | |
| The design specifications for a jack handle, comparing various options and making a recommendation for an order. | 18th Feb 1929 | Box 52 \ 4 Scan021 | |
| Requesting the return of a sample Tangye jack for a 20 HP car for demonstration purposes. | 21th Feb 1929 | Box 52 \ 4 Scan022 | |
| Return of a sample Tangye jack for a 20 HP car. | 25th Feb 1929 | Box 52 \ 4 Scan023 | |
| Standardisation document for replacing the Michelin jack with a British-made 'Tangye' jack for the 20 HP model. | 20th Feb 1929 | Box 52 \ 4 Scan024 | |
| The sourcing of a new jack for the 20 HP chassis from Tangye. | 31th Jan 1929 | Box 52 \ 4 Scan025 | |
| Comparison between a new Tangye jack and the existing Dunlop jack for the 40/50 HP chassis. | 1st May 1929 | Box 52 \ 4 Scan026 | |
| Suggested improvements to a car jack and proposing its standardisation to replace the Dunlop jack. | 23th May 1929 | Box 52 \ 4 Scan027 | |
| Agreeing to adopt the Tangye Jack for the 40/50 HP chassis to replace the Dunlop jack. | 23th May 1929 | Box 52 \ 4 Scan028 | |
| Inquiry regarding the standardisation of the Tangye jack for the 40/50 HP chassis. | 4th Jun 1929 | Box 52 \ 4 Scan029 | |
| Supply and cost of jacks for the 40/50 HP Chassis from supplier Tangye. | 31th Jul 1929 | Box 52 \ 4 Scan030 | |
| Inability of Tangye to supply a suitable jack, leading to the continued use of the Dunlop jack. | 23th Aug 1929 | Box 52 \ 4 Scan031 | |
| The poor quality of production Tangye Jacks for the 20 HP chassis compared to the approved sample. | 3rd Oct 1929 | Box 52 \ 4 Scan032 | |
| History of sourcing and subsequent quality issues with wheel jacks for the 20 HP cars. | 31th Oct 1929 | Box 52 \ 4 Scan033 | |
| Recommendation to cease ordering Tangye jacks and instead use a modified, less expensive Dunlop jack for 20 HP and Phantom II cars. | 30th Oct 1929 | Box 52 \ 4 Scan034 | |
| Sample of a modified Tangye Jack, querying its cadmium plating. | 30th Oct 1929 | Box 52 \ 4 Scan035 | |
| Sample Tangye Jack with a cadmium plated tube. | 6th Nov 1929 | Box 52 \ 4 Scan036 | |
| Questioning the delivery of a second sample Tangye Jack. | 1st Nov 1929 | Box 52 \ 4 Scan037 | |
| Sample Jack design, materials, and testing, received from Tangyes. | 2nd Sep 1930 | Box 52 \ 4 Scan038 | |
| Testing a jack made by Tangyes, including conditions and material requirements. | 22th Sep 1930 | Box 52 \ 4 Scan039 | |
| Test report and commentary on a car jack manufactured by Tangyes. | 9th Oct 1930 | Box 52 \ 4 Scan040 | |
| Dispatch of two Tangye Jacks for testing and design checking. | 12th Feb 1931 | Box 52 \ 4 Scan041 | |
| Test report on a Tangye double lift screw jack, detailing dimensions, weight, and test results. | 4th Mar 1931 | Box 52 \ 4 Scan042 | |
| Assessment of a large screw jack and a hydraulic jack, finding the hydraulic jack unsuitable due to its dimensions and oil leaks. | 4th Mar 1931 | Box 52 \ 4 Scan043 | |
| Blueprint for two half-size model crankshafts for experimental comparison. | 10th Oct 1933 | Box 52 \ 4 Scan044 | |
| Internal memorandum discussing the concept of 100% balance in four-bearing versus seven-bearing crankshafts. | 21th Nov 1933 | Box 52 \ 4 Scan045 | |
| Data table listing the balance and out-of-balance measurements for centre and end units. | 21th Nov 1933 | Box 52 \ 4 Scan046 | |
| Blueprint of a multi-throw crankshaft with various dimensional annotations. | 21th Nov 1933 | Box 52 \ 4 Scan047 | |
| The torque reversal test performed on model cranks DEB.2070 A & B. | 21th Feb 1934 | Box 52 \ 4 Scan048 | |
| Joggling test results for Model Cranks, design 2070 A & B, including a diagram of a typical fracture. | 10th Feb 1934 | Box 52 \ 4 Scan049 | |
| Letter from a supplier detailing the testing procedures for four 6-volt starter batteries. | 25th May 1929 | Box 52 \ 4 Scan050 | |
| Routine treatment report for a car lighting and starting battery, detailing charge and discharge cycles. | 3rd Jun 1929 | Box 52 \ 4 Scan051 | |
| Test report detailing the second charge cycle data and readings for a 6-cell battery. | 3rd Jun 1929 | Box 52 \ 4 Scan052 | |
| Log sheet detailing battery cell performance, charge data, and temperature readings. | 3rd Jun 1929 | Box 52 \ 4 Scan053 | |
| Battery charging and performance test log with cell-by-cell readings. | 25th May 1929 | Box 52 \ 4 Scan054 | |
| Missing correspondence concerning Ediswan batteries, referencing a letter about an arrangement to send four starter batteries. | 25th May 1929 | Box 52 \ 4 Scan055 | |
| Test report on an Ediswan Battery (221) after 10 months of bench life testing. | 3rd Apr 1930 | Box 52 \ 4 Scan056 | |
| Requesting the return of a dry and unused Ediswan battery to the Edison Swan Electric Co. | 22th May 1930 | Box 52 \ 4 Scan057 | |
| Experimental record sheet for an Ediswan XSB SS 7-3-4 battery. | 23th Jul 1930 | Box 52 \ 4 Scan058 | |
| Experimental record sheet for an Ediswan XSB 557-1-2 battery. | 13th Aug 1930 | Box 52 \ 4 Scan059 | |
| Battery discharge test chart for an Ediswan XSB 557-1-2 battery. | 20th Jun 1929 | Box 52 \ 4 Scan060 | |
| Chart recording of an electrical test measuring ampere-hour performance over time. | 28th Jun 1929 | Box 52 \ 4 Scan061 | |
| Performance test chart for Ediswan 6-volt units. | 2nd Apr 1930 | Box 52 \ 4 Scan062 | |
| Letter to The Edison Swan Electric Co. Ltd. regarding specifications for 20/25 and 40/50 HP chassis batteries. | 5th Jun 1931 | Box 52 \ 4 Scan063 | |
| Letter from The Edison Swan Electric Company acknowledging receipt of a letter regarding specifications for two batteries. | 8th Jun 1931 | Box 52 \ 4 Scan064 | |
| Information and a trial of a car fitted with a Salerni Coupling. | 4th Apr 1929 | Box 52 \ 4 Scan065 | |
| Potential testing and anticipated performance of a Salerni coupling. | 6th Apr 1929 | Box 52 \ 4 Scan066 | |
| From 'DA' to 'HS' requesting a demonstration of the Salerni coupling. | 27th Mar 1929 | Box 52 \ 4 Scan067 | |
| Outlining an idea for an easy-change device for gearboxes. | 14th Apr 1929 | Box 52 \ 4 Scan068 | |
| The performance and qualifications of a Salerni coupling fitted to a 7 HP Fiat. | 17th Apr 1929 | Box 52 \ 4 Scan069 | |
| Continued document discussing the drawback of a heavy clutch pedal. | 30th May 1929 | Box 52 \ 4 Scan070 | |
| Urgent experiment with a Salerni coupling for the 14-EX model. | 30th May 1929 | Box 52 \ 4 Scan071 | |
| 'The Gearbox Problem' and potential solutions for creating a quieter and more easily changed gear. | 3rd Jun 1929 | Box 52 \ 4 Scan072 | |
| Operational issues of the Salerni Coupling and proposing design modifications. | 3rd Jun 1929 | Box 52 \ 4 Scan073 | |
| Potential gearbox and clutch designs, including the Salerni coupling. | 6th Jun 1929 | Box 52 \ 4 Scan074 | |
| Modifications to the brake linkage and servo for the Salerni coupling on EAC.7. | 6th Jun 1929 | Box 52 \ 4 Scan075 | |
| New scheme for a silent 3rd speed gearbox using a single and double helical arrangement. | 2nd Jun 1929 | Box 52 \ 4 Scan076 | |
| Correction to a scheme for an experimental Salerni coupling on an EAC.7. gearbox. | 8th Jun 1929 | Box 52 \ 4 Scan077 | |
| Comparing an Isotta Fraschini to a Rolls Royce car and discussing a coincidental epicyclic gearbox design. | 1st Mar 1930 | Box 52 \ 4 Scan078 | |
| Typed letter discussing Mr. Salerni's visits, a potential patent conflict over gear arrangement, and a proposed working agreement. | 13th Jan 1930 | Box 52 \ 4 Scan079 | |
| From 'R.' regarding the development of a silent, easy-to-change 4-speed gearbox using a Salerni coupling. | 13th Jan 1930 | Box 52 \ 4 Scan080 | |
| Salerni coupling, discussing the control rod, load capacity, and proposed modifications. | 3rd Mar 1930 | Box 52 \ 4 Scan081 | |
| Progress on the Salerni coupling for the EAC.7 gearbox. | 7th May 1930 | Box 52 \ 4 Scan082 | |
| The progress of an experiment fitting a Salerni coupling to the 14-EX chassis for gearbox development. | 23th Aug 1930 | Box 52 \ 4 Scan083 | |
| Company's present position on various change-gear technologies and their potential adoption. | 1st Nov 1930 | Box 52 \ 4 Scan084 | |
| Various gearbox designs, including overspeed, Panhard, freewheel, and epicyclic systems. | 1st Nov 1930 | Box 52 \ 4 Scan085 | |
| Progress report on the design of a new 3-speed gearbox with semi-silent, pre-selection easy change features. | 11th Nov 1930 | Box 52 \ 4 Scan086 | |
| Difficulties experienced while testing the Salerni Coupling. | 11th Nov 1930 | Box 52 \ 4 Scan087 | |
| Brief review of the operation of the Salerni coupling on RAC. 7. | 11th Nov 1930 | Box 52 \ 4 Scan088 | |
| Instructions and analysis of gear engagement and clutch operation for a Salerni gearbox. | 11th Nov 1930 | Box 52 \ 4 Scan089 | |
| Issues with gear engagement, the Salerni coupling, cone brake, and a torsion spring. | 11th Nov 1930 | Box 52 \ 4 Scan090 | |
| Blueprint diagram of a Salerni Coupling in the free-wheeling position. | 13th Nov 1930 | Box 52 \ 4 Scan091 | |
| Description of the operation of the Salerni lever mechanism. | 13th Nov 1930 | Box 52 \ 4 Scan092 | |
| Two diagrams illustrating the freewheeling and engaged positions of a simplified Salooni operating mechanism on EAC 7. | 15th Nov 1930 | Box 52 \ 4 Scan093 | |
| Issues and potential experimental use of the Salerni coupling on a 40/50 model. | 15th Nov 1930 | Box 52 \ 4 Scan094 | |
| Instruction about ensuring no load on the clutch rod when the coupling is engaged. | 17th Nov 1930 | Box 52 \ 4 Scan095 | |
| Request to insert packing pieces and reduce torque on the springs for a Salerni coupling on a 14-Ex model. | 17th Nov 1930 | Box 52 \ 4 Scan096 | |
| Experiments to be carried out on the Salerni coupling for the EAC.7. | 18th Nov 1930 | Box 52 \ 4 Scan097 | |
| Issues with change gear mechanisms, specifically Maybach jaws, and proposing alternative solutions. | 3rd Mar 1931 | Box 52 \ 4 Scan098 | |
| The proposal to carry two spare wheels on the rear of a Phantom II for the Prince of Wales. | 15th Nov 1929 | Box 52 \ 4 Scan099 | |
| The proposal to carry two spare wheels on a Phantom II car for the Prince of Wales. | 20th Nov 1929 | Box 52 \ 4 Scan100 | |
| Weight distribution at the rear of cars, specifically regarding spare wheel placement for H.R.H. The Prince of Wales. | 26th Nov 1929 | Box 52 \ 4 Scan101 | |
| Required improvements and concerns for car 115-WJ, belonging to the Prince of Wales. | 12th Dec 1929 | Box 52 \ 4 Scan102 | |
| Faults on a car's bonnet, radiator, shock absorbers, springing and steering, including a special mascot for the Prince of Wales. | 12th Dec 1929 | Box 52 \ 4 Scan103 | |
| Letter to H.M. Hobson Ltd. regarding failures on K. S. Petrol Gauges, including one on the Prince of Wales' car. | 18th Jan 1930 | Box 52 \ 4 Scan104 | |
| Proposal to increase luggage box size and its impact on weight distribution and steering. | 13th Jan 1930 | Box 52 \ 4 Scan105 | |
| Car test and a steering question related to the Prince of Wales' car. | 10th Jan 1930 | Box 52 \ 4 Scan106 | |
| Modifications to the Prince of Wales' car, concerning the fitting of two rear wheels and its effect on steering. | 9th Jan 1930 | Box 52 \ 4 Scan107 | |
| Failure of a Hobson K.S. Telegauge on chassis 115-WJ, belonging to the Prince of Wales. | 22th Jan 1930 | Box 52 \ 4 Scan108 | |
| Letter concerning the return of a faulty telegauge head from the Prince of Wales' car for inspection due to a suspected leak. | 22th Jan 1930 | Box 52 \ 4 Scan109 | |
| The despatch of one Telegauge Head to Messrs H.M. Hobson for inspection. | 22th Jan 1930 | Box 52 \ 4 Scan110 | |
| Confirming the repair and dispatch of the dashboard unit from the Prince of Wales' car. | 7th Feb 1930 | Box 52 \ 4 Scan111 | |
| Alterations and performance testing of car 115-WJ, belonging to the Prince of Wales. | 26th Apr 1930 | Box 52 \ 4 Scan112 | |
| | | | |
