| Description | Date | Identifier | |
| The condition and failure analysis of batteries, noting the lack of a single weak point. | 24th Mar 1926 | West Wittering \ O \ 2January1926-March1926 Scan188 | |
| Comparison of the general behaviour of P & R RR11-1 and Exide 6-RR5-2 40/50 HP standard batteries. | 17th Mar 1926 | West Wittering \ O \ 2January1926-March1926 Scan189 | |
| Comparison report on the performance and condition of P & R and Exide batteries after testing on various chassis. | 22th Jan 1926 | West Wittering \ O \ 2January1926-March1926 Scan190 | |
| The condition of P & R and Exide battery cells, detailing plate and component wear. | 22th Jan 1926 | West Wittering \ O \ 2January1926-March1926 Scan191 | |
| Battery separator wear, comparing the performance of P & R and Exide batteries. | 22th Jan 1926 | West Wittering \ O \ 2January1926-March1926 Scan192 | |
| Bar chart comparing the mileage performance of EXIDE and P&R components on a chassis before failure. | 22th Jan 1926 | West Wittering \ O \ 2January1926-March1926 Scan193 | |
| The results of testing new diffusers, detailing efficiency, pressure, horsepower and air temperature. | 29th Mar 1926 | West Wittering \ O \ 2January1926-March1926 Scan194 | |
| Customer complaints and proposed modifications for low-speed steering wobbles on the 20 HP model. | 29th Mar 1926 | West Wittering \ O \ 2January1926-March1926 Scan195 | |
| Proposal for a new dashboard stiffener for the New Phantom steering gear. | 1st Apr 1926 | West Wittering \ O \ April1926-June1926 Scan1 | |
| Suggestions for lightening the Phantom engine by substituting materials and altering designs. | 1st Apr 1926 | West Wittering \ O \ April1926-June1926 Scan2 | |
| Blueprints and design considerations for a Lighter Phantom Engine. | 1st Apr 1926 | West Wittering \ O \ April1926-June1926 Scan3 | |
| Scheme to fit hydraulic shock dampers to the 20HP chassis for testing. | 1st Apr 1926 | West Wittering \ O \ April1926-June1926 Scan4 | |
| High-speed steering wobbles observed on vehicle 7-EX with medium pressure tyres. | 2nd Apr 1926 | West Wittering \ O \ April1926-June1926 Scan5 | |
| Design and fitting of a steering column for the 10,000 Miles India Car. | 2nd Apr 1926 | West Wittering \ O \ April1926-June1926 Scan6 | |
| Outlining the urgent priorities for the 'Phantom' weight reduction project. | 2nd Apr 1926 | West Wittering \ O \ April1926-June1926 Scan7 | |
| Positioning and specifications for hydraulic shock dampers on a Phantom rear axle. | 4th Apr 1926 | West Wittering \ O \ April1926-June1926 Scan8 | |
| Sluggishness in the change speed lever of India gearboxes and requesting tests to inform modifications for a new model. | 8th Apr 1926 | West Wittering \ O \ April1926-June1926 Scan9 | |
| Outlining proposals for further suspension experiments on 20HP and Phantom models. | 10th Apr 1926 | West Wittering \ O \ April1926-June1926 Scan10 | |
| Benefits and further improvements for a lighter, higher horsepower Phantom aluminium engine. | 15th Apr 1926 | West Wittering \ O \ April1926-June1926 Scan11 | |
| Note on tyre deflection, the disappointing performance of balloon tyres, and a personal mention of illness. | 26th Apr 1928 | West Wittering \ O \ April1926-June1926 Scan13 | |
| Telegram with instructions for modifying the Phantom's springing and brakes. | 13th Apr 1926 | West Wittering \ O \ April1926-June1926 Scan14 | |
| Results and impressions of suspension tests on a pre-'U' series Silver Ghost and a New Phantom. | 13th Apr 1926 | West Wittering \ O \ April1926-June1926 Scan15 | |
| Modifications to the front anchorage and gusset of rear springs. | 14th Apr 1926 | West Wittering \ O \ April1926-June1926 Scan16 | |
| Shock absorbers and the springing setup for the Phantom model. | 14th Apr 1926 | West Wittering \ O \ April1926-June1926 Scan17 | |
| Road clearance, chassis design, and comparison with competitor vehicles. | 4th Apr 1926 | West Wittering \ O \ April1926-June1926 Scan18 | |
| Controversial appearance of the 'scuttle isolation' gap, requiring Sales department signatures. | 4th Apr 1926 | West Wittering \ O \ April1926-June1926 Scan19 | |
| Material selection for valve push rods on Phantom engines. | 15th Apr 1926 | West Wittering \ O \ April1926-June1926 Scan20 | |
| Modifications to the connecting rods for the lighter Phantom engine. | 15th Apr 1926 | West Wittering \ O \ April1926-June1926 Scan21 | |
| Requesting the return of a 'Double Autovac' model to Mr. Charles H. Bowser. | 15th Apr 1926 | West Wittering \ O \ April1926-June1926 Scan22 | |
| Letter to Charles H. Bowser Esq. regarding the unsuitability of the 'Double Autovac' and the return of the model and patent specification. | 15th Apr 1926 | West Wittering \ O \ April1926-June1926 Scan23 | |
| Posing questions regarding valve seat trouble in cast iron, wrought steel and various engine models. | 16th Apr 1926 | West Wittering \ O \ April1926-June1926 Scan24 | |
| Requesting designs for locking the float chamber lids of two chassis. | 16th Apr 1926 | West Wittering \ O \ April1926-June1926 Scan25 | |
| Steering box design, efficiency, improvements, and a proposed friction-based damping device. | 17th Apr 1925 | West Wittering \ O \ April1926-June1926 Scan26 | |
| Design progress of a lighter gearbox, clutch, and flywheel for the Phantom model. | 17th Apr 1926 | West Wittering \ O \ April1926-June1926 Scan27 | |
| Complaints and proposing solutions for the Phantom suspension system. | 17th Apr 1926 | West Wittering \ O \ April1926-June1926 Scan28 | |
| Clarifying the application of paragraphs to various cars and noting a design change for the spring arrangement. | 19th Feb 1934 | West Wittering \ O \ April1926-June1926 Scan29 | |
| Difficulties and potential solutions for fitting hydraulic shock dampers to the 7-EX model. | 17th Apr 1926 | West Wittering \ O \ April1926-June1926 Scan30 | |
| Outlining proposed improvements to the Phantom Relay Advance mechanism, including a graph of advance versus engine revolutions. | 18th Apr 1926 | West Wittering \ O \ April1926-June1926 Scan31 | |
| The defects of front and back axle control, referencing other manufacturers and proposing a new design. | 18th Apr 1926 | West Wittering \ O \ April1926-June1926 Scan32 | |
| Requirements and improvements for the Phantom's springing and shock dampers. | 18th Apr 1926 | West Wittering \ O \ April1926-June1926 Scan33 | |
| Requesting the return of a Kennedy Road Spring model to Kennedy Bros. | 19th Apr 1926 | West Wittering \ O \ April1926-June1926 Scan34 | |
| Letter to Messrs Kennedy Bros. rejecting a spring model based on their patent as it does not suit requirements. | 19th Apr 1926 | West Wittering \ O \ April1926-June1926 Scan35 | |
| Comparing a revised blueprint (LeC.2232) with an original scheme (LeC.2214) for Phantom Oil Relief Valves. | 20th Apr 1926 | West Wittering \ O \ April1926-June1926 Scan36 | |
| Suspension model demonstrating the 'centre of percussion' and suggesting further tests on the Phantom and 20HP chassis. | 20th Apr 1926 | West Wittering \ O \ April1926-June1926 Scan37 | |
| From 'R.' listing seventeen desired urgent modifications and improvements for a vehicle. | 21th Apr 1926 | West Wittering \ O \ April1926-June1926 Scan38 | |
| Advantages of parallel control for back axles and universal joints to improve transmission flexibility. | 21th Apr 1926 | West Wittering \ O \ April1926-June1926 Scan39 | |
| Secret memorandum regarding the investigation and fitting of hydraulic shock dampers to various chassis. | 21th Apr 1926 | West Wittering \ O \ April1926-June1926 Scan40 | |
| Drawings for a 20HP Oil Pump Relief Valve. | 22th Apr 1926 | West Wittering \ O \ April1926-June1926 Scan41 | |
| Analyzing the failure of a pedestal piston and proposing three design improvements to strengthen it. | 22th Apr 1926 | West Wittering \ O \ April1926-June1926 Scan42 | |
| Modernised guideless oil relief valve for a 20HP chassis. | 22th Apr 1926 | West Wittering \ O \ April1926-June1926 Scan43 | |
| Proposed improvements to the Eagle 16 cylinder head, specifically drawing LeC.2233. | 22th Apr 1926 | West Wittering \ O \ April1926-June1926 Scan44 | |
| 'Servo Jaggers' and the use of a Phantom rubber washer as a necessary fitment on the 20HP model. | 22th Apr 1926 | West Wittering \ O \ April1926-June1926 Scan45 | |
| Suspension issues on a 20HP model after a 10,000-mile test and recommending proprietary hydraulic shock dampers. | 22th Apr 1926 | West Wittering \ O \ April1926-June1926 Scan46 | |
| Progressive development of hydraulic shock dampers, favouring a restricted vent design. | 22th Apr 1926 | West Wittering \ O \ April1926-June1926 Scan47 | |
| Status and required modifications for components of a sequence starter. | 4th Jan 1926 | West Wittering \ O \ January1926-March1926 Scan0 | |
| Experiments to eliminate 'servo jaggers' by modifying springs or the brake counter-shaft. | 1st Jan 1926 | West Wittering \ O \ January1926-March1926 Scan1 | |
| Alterations and improvements for the new Phantom starter motor. | 6th Jan 1926 | West Wittering \ O \ January1926-March1926 Scan2 | |
| Proposing a design change for 20HP chassis connecting rods to use separate bushes. | 7th Jan 1926 | West Wittering \ O \ January1926-March1926 Scan3 | |
| Design changes for a new dashboard vacuum tank, including its capacity, tap type, and the addition of a drain plug. | 8th Jan 1926 | West Wittering \ O \ January1926-March1926 Scan4 | |
| Various proposed layouts and modifications for EAC.7 frame tie-bars. | 8th Jan 1926 | West Wittering \ O \ January1926-March1926 Scan5 | |
| Modifications required to adapt the dashboard for 'C' and 'D' type steerings. | 1st Jan 1926 | West Wittering \ O \ January1926-March1926 Scan6 | |
| Proposed method of mounting the Klaxon horn on a new dashboard. | 8th Jan 1926 | West Wittering \ O \ January1926-March1926 Scan7 | |
| Revised stepped dashboard design, changing from sheet metal to a casting. | 8th Jan 1926 | West Wittering \ O \ January1926-March1926 Scan8 | |
| Seeking an opinion on the Kennedy Bros. proposal for lubricating a leaf spring using brass or gun metal interleaving. | 12th Jan 1926 | West Wittering \ O \ January1926-March1926 Scan9 | |
| Seeking an opinion on the Kennedy method for lubricating a leaf spring. | 12th Jan 1926 | West Wittering \ O \ January1926-March1926 Scan10 | |
| Omission of a subframe for a lighter open-body car on chassis X7830. | 14th Jan 1926 | West Wittering \ O \ January1926-March1926 Scan11 | |
| Proposed modifications and schemes for a rear axle and its braking system, awaiting a decision on the preferred design. | 10th Mar 1926 | West Wittering \ O \ January1926-March1926 Scan12 | |
| Alterations to the automatic starter switch for the New Phantom model. | 18th Jan 1926 | West Wittering \ O \ January1926-March1926 Scan13 | |
| Abandoning the subframe on cantilever sprung cars in favour of the EAC. 7 frame with semi-elliptic springs. | 19th Jan 1926 | West Wittering \ O \ January1926-March1926 Scan14 | |
| Connecting rods for a 20HP engine destined for India, detailing the use of separate liners and mild steel bushes. | 19th Jan 1926 | West Wittering \ O \ January1926-March1926 Scan15 | |
| Design improvements for a Sequence Starter solenoid unit, focusing on the bobbin, casing, and magnet. | 19th Jan 1926 | West Wittering \ O \ January1926-March1926 Scan16 | |
| Design, wiring diagram, and testing of a duplex press button sequence starter switch. | 20th Jan 1926 | West Wittering \ O \ January1926-March1926 Scan17 | |
| New scheme for steering positions to accommodate a steering box with a large worm. | 22th Jan 1926 | West Wittering \ O \ January1926-March1926 Scan18 | |
| Modifications to the 'C' & 'D' type steering column dashboard casting. | 22th Jan 1926 | West Wittering \ O \ January1926-March1926 Scan19 | |
| Alterations to the EAC.8 dashboard to allow for column movement. | 22th Jan 1926 | West Wittering \ O \ January1926-March1926 Scan20 | |
| Complaint about rattling controls in the New Phantom steering column and proposing anti-rattle solutions. | 23th Jan 1926 | West Wittering \ O \ January1926-March1926 Scan21 | |
| Investigation into the engine balance of a 16-cylinder engine using articulated connecting rods. | 23th Jan 1926 | West Wittering \ O \ January1926-March1926 Scan22 | |
| Requesting the testing of piston-type hydraulic shock dampers. | 23th Jan 1926 | West Wittering \ O \ January1926-March1926 Scan23 | |
| Memo about modifications to a connecting rod design for a 20 HP test car. | 23th Jan 1926 | West Wittering \ O \ January1926-March1926 Scan24 | |
| Confirmation of a wire regarding the purchase of a car body for EAC 8. | 26th Jan 1926 | West Wittering \ O \ January1926-March1926 Scan25 | |
| Different schemes for camshaft arrangements in connection with double rear brakes. | 26th Jan 1926 | West Wittering \ O \ January1926-March1926 Scan26 | |
| Two alternative design schemes for a damped pendulum lever, awaiting final approval from Mr. Royce. | 26th Jan 1926 | West Wittering \ O \ January1926-March1926 Scan27 | |
| Modifications for India gearbox and floorboard clearances. | 27th Jan 1926 | West Wittering \ O \ January1926-March1926 Scan28 | |
| Comparative analysis of the spring suspension systems on the 20HP Lanchester, New Phantom, and 20HP models. | 27th Jan 1926 | West Wittering \ O \ January1926-March1926 Scan29 | |
| Continued comparison of suspension systems for the New Phantom and 20HP models, discussing damping and springing. | | West Wittering \ O \ January1926-March1926 Scan30 | |
| List of new parts to be tested on the next 20HP chassis for its 10,000-mile trial. | 29th Jan 1926 | West Wittering \ O \ January1926-March1926 Scan31 | |
| Duplex press button switch for the New Phantom model. | 2nd Feb 1926 | West Wittering \ O \ January1926-March1926 Scan32 | |
| Standardisation of the double arm type spare wheel carrier for production cars. | 2nd Feb 1926 | West Wittering \ O \ January1926-March1926 Scan33 | |
| New scheme for sheet metal wing stays and the mounting of headlamps for model EAC. 8. | 2nd Feb 1926 | West Wittering \ O \ January1926-March1926 Scan34 | |
| Instructing to incorporate a Mechanic's joint in the propeller shaft for EAC. 7. | 3rd Feb 1926 | West Wittering \ O \ January1926-March1926 Scan35 | |
| Proposals for a new rear brake design to be trialled on the Phantom model. | 1st Feb 1926 | West Wittering \ O \ January1926-March1926 Scan36 | |
| Design notes and diagrams for a reeded pressing and a supporting pin using ferrule construction. | 19th Feb 1938 | West Wittering \ O \ January1926-March1926 Scan37 | |
| On rear springing and tyres, recommending semi-balloon tyres and hydraulic shock dampers for improved ride comfort on rough roads. | 4th Feb 1926 | West Wittering \ O \ January1926-March1926 Scan38 | |
| Proposing four different design solutions with sketches for eliminating rattles in Phantom controls. | 4th Feb 1926 | West Wittering \ O \ January1926-March1926 Scan39 | |
| Typed memo from DA to HS confirming receipt of a telegram and arranging a visit to Derby. | 6th Feb 1926 | West Wittering \ O \ January1926-March1926 Scan40 | |
| Design improvements and material suggestions for rear brakes to reduce complexity and weight. | 8th Feb 1930 | West Wittering \ O \ January1926-March1926 Scan41 | |
| Proposal for a self-adjusting brake mechanism using a ratchet wheel to automatically compensate for wear. | 8th Feb 1926 | West Wittering \ O \ January1926-March1926 Scan42 | |
| With sketches discussing improvements to petrol tanks, focusing on air escape during filling and anti-surge measures. | 2nd Aug 1926 | West Wittering \ O \ January1926-March1926 Scan43 | |
| Outlining the value of using an aluminium head and cylinders for the Phantom Engine. | 8th Feb 1926 | West Wittering \ O \ January1926-March1926 Scan44 | |
| From DA to HS regarding the scheduling of a proposed visit to Derby. | 9th Feb 1926 | West Wittering \ O \ January1926-March1926 Scan45 | |
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