| Description | Date | Identifier | |
| Report summarizing preliminary tests on Phantom engine vibrations and friction torque. | 20th Sep 1926 | West Wittering \ P \ 2July1926-September1926 Scan178 | |
| Vibration experiments and damping friction tests on the '20 HP' and 'Phantom' models. | 20th Sep 1926 | West Wittering \ P \ 2July1926-September1926 Scan179 | |
| Engine vibration tests concerning friction torque, damping, and the effect of piston weight and position. | 20th Sep 1926 | West Wittering \ P \ 2July1926-September1926 Scan180 | |
| The investigation of torsional oscillations, piston weights, and the effects of a stiffer crankshaft. | 20th Sep 1926 | West Wittering \ P \ 2July1926-September1926 Scan181 | |
| Crankshaft vibration testing and measuring the torsional rigidity of the Phantom and Silver Ghost models. | 1st Sep 1926 | West Wittering \ P \ 2July1926-September1926 Scan182 | |
| Tests conducted in France for the Phantom's lightened type front axle. | 1st Sep 1926 | West Wittering \ P \ 2July1926-September1926 Scan184 | |
| Summary of tests on a lightened front axle including comparisons, steering friction, tyres, and suspension settings. | 1st Sep 1926 | West Wittering \ P \ 2July1926-September1926 Scan185 | |
| Report comparing a new lightened front axle with a standard axle on various performance characteristics. | 1st Sep 1926 | West Wittering \ P \ 2July1926-September1926 Scan186 | |
| Testing steering friction and axle arrangements to address low-speed wobbles. | 1st Sep 1926 | West Wittering \ P \ 2July1926-September1926 Scan187 | |
| Comparison of steering and ride characteristics using Dunlop 6.75' and Michelin 6.2' tyres at various pressures. | 1st Sep 1926 | West Wittering \ P \ 2July1926-September1926 Scan188 | |
| The performance of different tyre models and the effect of tyre pressure on car control. | 1st Sep 1926 | West Wittering \ P \ 2July1926-September1926 Scan189 | |
| Shock damper settings and their effects on vehicle handling with Michelin 6.2' tyres. | 1st Sep 1926 | West Wittering \ P \ 2July1926-September1926 Scan190 | |
| Test report on steering tube arrangements with various spring ratings and tyres. | 1st Sep 1926 | West Wittering \ P \ 2July1926-September1926 Scan191 | |
| Analysis of front road springs and their effect on wobble and ride characteristics. | 21th Sep 1926 | West Wittering \ P \ 2July1926-September1926 Scan192 | |
| The discontinuation of 6.75' Traction Tread tyres by Dunlop and issues with the new replacement triple stud pattern. | 21th Sep 1926 | West Wittering \ P \ 2July1926-September1926 Scan194 | |
| Tyre supply issues with Dunlop, high-speed wobbles, and plans for improved triple stud tyres. | 21th Sep 1926 | West Wittering \ P \ 2July1926-September1926 Scan195 | |
| Proposed visit to test the 12-EX car and the aluminium Phantom engine. | 21th Sep 1926 | West Wittering \ P \ 2July1926-September1926 Scan196 | |
| Problem of squeaking brakes on cars fitted with a new lightened axle, suggesting dampers as a solution. | 1st Sep 1926 | West Wittering \ P \ 2July1926-September1926 Scan197 | |
| Confirming the despatch of a subframe to Messrs. Hoopers coachbuilders. | 22th Sep 1926 | West Wittering \ P \ 2July1926-September1926 Scan198 | |
| Steering tests and pivot inclination, comparing a new axle with an old axle. | 22th Sep 1926 | West Wittering \ P \ 2July1926-September1926 Scan199 | |
| Tests conducted on a standard axle with vertical king pins and the resulting effects on steering. | 22th Sep 1926 | West Wittering \ P \ 2July1926-September1926 Scan200 | |
| Page from a report discussing steering effort in relation to wheel center and king pin geometry. | 22th Sep 1926 | West Wittering \ P \ 2July1926-September1926 Scan201 | |
| Comparison of steering effort based on transverse pivot inclination for different car series and axle types. | 22th Sep 1926 | West Wittering \ P \ 2July1926-September1926 Scan202 | |
| Comparison of five different axle and pivot arrangements and their effect on steering heaviness. | 22th Sep 1926 | West Wittering \ P \ 2July1926-September1926 Scan203 | |
| The continued use and testing of Dunlop 6.75' traction tread tyres. | 22th Sep 1926 | West Wittering \ P \ 2July1926-September1926 Scan204 | |
| Test report comparing a vertical pivot front axle with a standard axle, focusing on handling characteristics with balloon tyres. | 22th Sep 1926 | West Wittering \ P \ 2July1926-September1926 Scan205 | |
| Analysis of steering geometry, pivot types, and their effects on vehicle handling and stability. | 22th Sep 1926 | West Wittering \ P \ 2July1926-September1926 Scan206 | |
| Steering performance issues, specifically road shocks and wobbles. | 23th Sep 1926 | West Wittering \ P \ 2July1926-September1926 Scan207 | |
| Experiments to determine the torsional deflection curve and rigidity of a Phantom crankshaft. | 23th Sep 1926 | West Wittering \ P \ 2July1926-September1926 Scan208 | |
| Calculation of weight and polar moment of inertia for various engine components. | 23th Sep 1926 | West Wittering \ P \ 2July1926-September1926 Scan209 | |
| Report analyzing engine oscillations and critical crankshaft speed, comparing the Phantom and 20 HP models. | 24th Sep 1926 | West Wittering \ P \ 2July1926-September1926 Scan210 | |
| Road test results of a finer primary coil on a 20 HP chassis. | 24th Sep 1926 | West Wittering \ P \ 2July1926-September1926 Scan212 | |
| Recurring crack in a Phantom engine crankcase during test bench runs. | 24th Sep 1926 | West Wittering \ P \ 2July1926-September1926 Scan213 | |
| Considering a single-block cylinder design to prevent a potential future issue. | 24th Sep 1926 | West Wittering \ P \ 2July1926-September1926 Scan214 | |
| Blueprint diagram illustrating the position of cracks in a Phantom crankcase. | 24th Sep 1926 | West Wittering \ P \ 2July1926-September1926 Scan215 | |
| Mileage test results for Redmanol encased ignition coils. | 25th Sep 1926 | West Wittering \ P \ 2July1926-September1926 Scan217 | |
| Comparative weight analysis of lightened Phantom engine components. | 27th Sep 1926 | West Wittering \ P \ 2July1926-September1926 Scan218 | |
| From EFC to AJS regarding a delay in test results for the X.7650 Sequence Starter. | 29th Sep 1926 | West Wittering \ P \ 2July1926-September1926 Scan219 | |
| Vibration issues and other faults on car 12-EX after 10,000 miles. | 1st Oct 1926 | West Wittering \ P \ 2October1926-December1926 Scan001 | |
| Potential trial of a serrated drive for the Phantom clutch coupling shaft and modifications to the original joint. | 4th Oct 1926 | West Wittering \ P \ 2October1926-December1926 Scan002 | |
| Modifications to the servo linkage and hand brake lever spring. | 2nd Oct 1926 | West Wittering \ P \ 2October1926-December1926 Scan003 | |
| Confirming Mr. Royce's agreement to use nickel steel for the bolts in a double bolt pedestal type piston. | 4th Oct 1926 | West Wittering \ P \ 2October1926-December1926 Scan004 | |
| Methods and challenges of creating reliable studded threads in aluminium. | 5th Oct 1926 | West Wittering \ P \ 2October1926-December1926 Scan005 | |
| Design revision for the Phantom carburetter throttle spindle, changing from ball bearings to roller bearings. | 5th Oct 1926 | West Wittering \ P \ 2October1926-December1926 Scan006 | |
| Design of a rear axle casing with hypoid gears, its assembly, adjustment, and component sourcing. | 6th Oct 1926 | West Wittering \ P \ 2October1926-December1926 Scan007 | |
| Methods to eliminate steering wobbles, including a new patentable idea for a self-righting spring mechanism. | 6th Oct 1926 | West Wittering \ P \ 2October1926-December1926 Scan008 | |
| Scheme 2278 for the 20HP battery-in-frame, its testing, and a query about caulked plugs. | 8th Oct 1926 | West Wittering \ P \ 2October1926-December1926 Scan009 | |
| Purchase of a Sizaire car and outlining potential improvements to front axle design, suspension, and steering. | 8th Oct 1926 | West Wittering \ P \ 2October1926-December1926 Scan010 | |
| Urgent internal memo discussing valve timing adjustments for the Aluminium Phantom engine. | 10th Sep 1926 | West Wittering \ P \ 2October1926-December1926 Scan011 | |
| Causes of gumming pistons, ranking various lubricating oils, and considering piston design. | 11th Oct 1926 | West Wittering \ P \ 2October1926-December1926 Scan012 | |
| Hydraulic damper design to improve steering by increasing the lean of pivot. | 11th Oct 1926 | West Wittering \ P \ 2October1926-December1926 Scan013 | |
| Use of a cast magnesium alloy for the lighter Phantom engine's valve rocker cover. | 13th Oct 1926 | West Wittering \ P \ 2October1926-December1926 Scan014 | |
| Piston leakage and the necessity to test at various pressures, not just various speeds. | 14th Oct 1926 | West Wittering \ P \ 2October1926-December1926 Scan015 | |
| Magneto drive slip and camshaft drive failure, including proposed solutions. | 16th Oct 1926 | West Wittering \ P \ 2October1926-December1926 Scan016 | |
| Proposed shield for 20HP shock dampers and a related modification for the forward shock damper bolt. | 19th Oct 1926 | West Wittering \ P \ 2October1926-December1926 Scan017 | |
| Need to improve vehicle qualities beyond horsepower, focusing on the Phantom & Goshawk models. | 27th Oct 1926 | West Wittering \ P \ 2October1926-December1926 Scan018 | |
| Series of questions regarding the performance characteristics and potential faults of a Lorraine-Dietrich car. | 27th Oct 1926 | West Wittering \ P \ 2October1926-December1926 Scan019 | |
| Comparing the 20HP chassis with competitors seen at a show, suggesting specific steering and suspension improvements. | 27th Oct 1926 | West Wittering \ P \ 2October1926-December1926 Scan020 | |
| Confirming a design suggestion for a Lighter Phantom cylinder head to achieve single flow turbulence. | 28th Oct 1926 | West Wittering \ P \ 2October1926-December1926 Scan021 | |
| Revised luggage grid for the Phantom model. | 28th Oct 1926 | West Wittering \ P \ 2October1926-December1926 Scan022 | |
| Modifications to the hypoid gear rear axle. | 28th Oct 1926 | West Wittering \ P \ 2October1926-December1926 Scan023 | |
| Mr. Royce's wish to test lower gear ratios on the 20HP model, with a proposal for a 5.2 ratio spiral bevel gear. | 29th Oct 1926 | West Wittering \ P \ 2October1926-December1926 Scan024 | |
| Design and specifications for hypoid gears, comparing different ratios and schemes. | 29th Oct 1926 | West Wittering \ P \ 2October1926-December1926 Scan025 | |
| Request for a copy of a mislaid note regarding friction requirements for the ball ends of the steering gear. | 30th Oct 1926 | West Wittering \ P \ 2October1926-December1926 Scan026 | |
| Magnetos, comparing Lucas unfavourably with Watford and Bosch, and recommending the adoption of a Watford non-sleeve type. | 2nd Nov 1926 | West Wittering \ P \ 2October1926-December1926 Scan027 | |
| Suggesting a trial of a new simplified sequence starter for the 20HP model. | 2nd Nov 1926 | West Wittering \ P \ 2October1926-December1926 Scan028 | |
| Suggesting a trial of a simplified sequence starter for the 20HP model. | 2nd Nov 1926 | West Wittering \ P \ 2October1926-December1926 Scan029 | |
| The faults and performance of a competitor's 20HP Lorraine Detreich car. | 2nd Nov 1926 | West Wittering \ P \ 2October1926-December1926 Scan030 | |
| Methods to increase power from a 20HP engine and requesting an estimate on the expected results. | 2nd Nov 1926 | West Wittering \ P \ 2October1926-December1926 Scan031 | |
| Potential steering stiffness from spring-loaded ball joints if not properly lubricated. | 2nd Nov 1926 | West Wittering \ P \ 2October1926-December1926 Scan032 | |
| Improvement of the 20HP radiator by fitting vertical shutters. | 2nd Nov 1926 | West Wittering \ P \ 2October1926-December1926 Scan033 | |
| Two options for the Phantom throttle governor control and issues with silencer explosions. | 2nd Nov 1926 | West Wittering \ P \ 2October1926-December1926 Scan034 | |
| Modifications to the 20HP cast dash to make it suitable for use with a subframe. | 4th Nov 1926 | West Wittering \ P \ 2October1926-December1926 Scan035 | |
| New large diameter petrol tank filler and suspension link alterations for the 20HP car. | 4th Nov 1926 | West Wittering \ P \ 2October1926-December1926 Scan036 | |
| Calculations for steering friction plates and damper ball ends. | 4th Nov 1926 | West Wittering \ P \ 2October1926-December1926 Scan037 | |
| Testing of a 20HP Lorraine Dietrich and a suggestion for a simple accumulator charge indicator. | 5th Nov 1926 | West Wittering \ P \ 2October1926-December1926 Scan038 | |
| Modifications to the new front axle to adjust friction and improve steering. | 5th Nov 1926 | West Wittering \ P \ 2October1926-December1926 Scan039 | |
| Potential improvements to the Phantom steering system, including strengthening a pendulum lever and adding a hydraulic damper. | 6th Nov 1925 | West Wittering \ P \ 2October1926-December1926 Scan040 | |
| New scheme for a reinforced Phantom pendulum lever following a breakage, recommending immediate production. | 6th Nov 1926 | West Wittering \ P \ 2October1926-December1926 Scan041 | |
| Improvements for the Phantom throttle valve, addressing sticking issues, design modifications, and related heating systems. | 6th Nov 1926 | West Wittering \ P \ 2October1926-December1926 Scan042 | |
| Improving Mean Effective Pressure (MEP) for 20HP and 40/50 engines. | 8th Nov 1926 | West Wittering \ P \ 2October1926-December1926 Scan043 | |
| Request for a new 20HP engine cylinder head casting with several design improvements. | 8th Nov 1926 | West Wittering \ P \ 2October1926-December1926 Scan044 | |
| Requesting the setup of splashers in bicycle and Bugatti styles for the 20HP and 40/50 models. | 8th Nov 1926 | West Wittering \ P \ 2October1926-December1926 Scan045 | |
| Short memo querying the location of an engine, clutch, and back axle. | 8th Nov 1926 | West Wittering \ P \ 2October1926-December1926 Scan046 | |
| Modifications for a 20HP engine, specifying a stiffer crankshaft, longer bearings, and up-to-date webs. | 8th Nov 1926 | West Wittering \ P \ 2October1926-December1926 Scan047 | |
| Requesting top gear ratios for the 20HP and 40/50 models to achieve specific maximum speeds without vibration. | 8th Nov 1926 | West Wittering \ P \ 2October1926-December1926 Scan048 | |
| Requirements for a light, narrow, and silent saloon body for the 20HP chassis. | 8th Nov 1926 | West Wittering \ P \ 2October1926-December1926 Scan049 | |
| Suggesting a comparison test between the Lorraine car and a 20HP chassis by swapping their carburetters and induction systems. | 9th Nov 1926 | West Wittering \ P \ 2October1926-December1926 Scan050 | |
| Desired car bodies for the 20HP model and competitor analysis following a visit to the Olympia Motor Show. | 9th Nov 1926 | West Wittering \ P \ 2October1926-December1926 Scan051 | |
| Requesting design information for redesigning a starter motor for the EAC chassis. | 9th Nov 1926 | West Wittering \ P \ 2October1926-December1926 Scan052 | |
| Redesign of a starter motor for an EAC chassis, including gear ratios, torque, and power calculations. | 9th Nov 1926 | West Wittering \ P \ 2October1926-December1926 Scan053 | |
| Inquiry into the detonation characteristics of Anglo-Persian BP petrol and potential anti-knock additives. | 9th Nov 1926 | West Wittering \ P \ 2October1926-December1926 Scan054 | |
| Engine performance improvements through increased MEP and compression ratio, noting limitations from detonation and proposing solutions. | 9th Nov 1926 | West Wittering \ P \ 2October1926-December1926 Scan055 | |
| Design and setup for 20HP & 40/50HP steering buffer springs and ball joints. | 11th Nov 1926 | West Wittering \ P \ 2October1926-December1926 Scan056 | |
| Proposal from 'R' to 'HS' to fit a Lorraine-style carburetter and induction system to the 40/50 lightweight engine. | 11th Nov 1926 | West Wittering \ P \ 2October1926-December1926 Scan057 | |
| Requesting additional data for amps and efficiency for each torque value. | 15th Nov 1926 | West Wittering \ P \ 2October1926-December1926 Scan058 | |
| Trial of a new aluminium head on the vacuum tank, selected by Mr. Royce. | 16th Nov 1926 | West Wittering \ P \ 2October1926-December1926 Scan059 | |
| Suggestions to improve riding and steering qualities by reducing front-end weight on the Phantom model. | 16th Nov 1926 | West Wittering \ P \ 2October1926-December1926 Scan060 | |
| Provision of high gear ratios for 40/50 and 20HP cars. | 16th Nov 1926 | West Wittering \ P \ 2October1926-December1926 Scan061 | |
| Road test of a car with a Barker-Beatonson all-weather body, detailing various performance issues. | 16th Nov 1926 | West Wittering \ P \ 2October1926-December1926 Scan062 | |
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