| Description | Date | Identifier | |
| Modifications for a 25HP radiator to achieve a deeper appearance, including a scale drawing. | 23th Dec 1930 | West Wittering \ V \ October1930-February1931 Scan166 | |
| Testing the force required to operate radiator shutters, diagnosing friction issues, and proposing design geometry changes. | 24th Dec 1929 | West Wittering \ V \ October1930-February1931 Scan167 | |
| Proposal for a 4-shoe brake system adapted for the front brakes of the Phantom II. | 24th Dec 1930 | West Wittering \ V \ October1930-February1931 Scan168 | |
| Design change to the filter in hydraulic shock dampers. | 24th Dec 1930 | West Wittering \ V \ October1930-February1931 Scan169 | |
| Future design possibilities for the 20/25HP model, including engine enlargement and weight reduction. | 24th Dec 1930 | West Wittering \ V \ October1930-February1931 Scan170 | |
| Comparative table of various chassis specifications and a memo regarding weight reduction and increasing engine capacity. | 18th Dec 1930 | West Wittering \ V \ October1930-February1931 Scan171 | |
| Potential engine modifications to increase length, bore, and capacity. | 18th Dec 1930 | West Wittering \ V \ October1930-February1931 Scan172 | |
| Comparison of various car models based on their 'Displacement Per Ton' metric, with handwritten annotations. | 18th Dec 1930 | West Wittering \ V \ October1930-February1931 Scan173 | |
| The pros and cons of drawing intake air from the crankchamber for twin type carburetters. | 26th Dec 1930 | West Wittering \ V \ October1930-February1931 Scan174 | |
| On American car production experience, with notes on improving acceleration and steering. | 26th Dec 1930 | West Wittering \ V \ October1930-February1931 Scan175 | |
| Merits and technical details of increasing the engine size of the 25HP model. | 27th Dec 1930 | West Wittering \ V \ October1930-February1931 Scan176 | |
| Letter discussing the strategy of mass production with quality, with comparisons to Ford and American competitors. | 2nd Jan 1931 | West Wittering \ V \ October1930-February1931 Scan177 | |
| Engine specifications and chassis design for a 25HP car model. | 2nd Jan 1931 | West Wittering \ V \ October1930-February1931 Scan178 | |
| Proposed engine modifications, their impact on weight and cost, and torque reaction issues with the 18-EX model. | 5th Jan 1931 | West Wittering \ V \ October1930-February1931 Scan179 | |
| Design issues with a revised luggage grid, specifically regarding number plate placement and ground clearance. | 5th Jan 1931 | West Wittering \ V \ October1930-February1931 Scan180 | |
| Patent situation and design considerations for double-acting shock dampers. | 6th Jan 1931 | West Wittering \ V \ October1930-February1931 Scan181 | |
| Technical memorandum discussing damper design, including slack removal, lubrication, and specific design considerations. | 6th Jan 1931 | West Wittering \ V \ October1930-February1931 Scan182 | |
| Dynamo output issues and proposing a voltage control vibrator as a solution. | 6th Jan 1931 | West Wittering \ V \ October1930-February1931 Scan183 | |
| Dynamo output, battery charging, and potential failure schemes for a vibrator. | 6th Jan 1931 | West Wittering \ V \ October1930-February1931 Scan184 | |
| Difficulties and strategy for the American car trade, including the introduction of a new 12-cylinder engine. | 6th Jan 1931 | West Wittering \ V \ October1930-February1931 Scan185 | |
| Comparing two design schemes (3193 and 1413) for a universal dashboard. | 18th Jan 1934 | West Wittering \ V \ October1930-February1931 Scan186 | |
| Preliminary specification document for a 28HP chassis. | 1st Jan 1931 | West Wittering \ V \ October1930-February1931 Scan187 | |
| Design suggestions and cost-saving measures for a new chassis, including the L.H. 28HP model. | 1st Jan 1931 | West Wittering \ V \ October1930-February1931 Scan188 | |
| Page discussing the maintenance of production flow for right and left-hand chassis. | 9th Jan 1931 | West Wittering \ V \ October1930-February1931 Scan189 | |
| Suggestion to replace 60 watt headlamp bulbs with 48 watt bulbs to better manage battery discharge and to standardize all bulbs used in the chassis. | 9th Jan 1931 | West Wittering \ V \ October1930-February1931 Scan190 | |
| Modifications to a two-charge electrical system for a car. | 10th Jan 1931 | West Wittering \ V \ October1930-February1931 Scan191 | |
| P. 2 piston being too short and proposing trials for a modified, longer version. | 10th Jan 1931 | West Wittering \ V \ October1930-February1931 Scan192 | |
| Feasibility of machining a 3.4 bore cylinder on existing 25HP centres for a 28HP cylinder block. | 10th Jan 1931 | West Wittering \ V \ October1930-February1931 Scan193 | |
| Failure of a 25HP exhaust manifold and potential design improvements. | 10th Jan 1931 | West Wittering \ V \ October1930-February1931 Scan194 | |
| Modifications and material trials for a double piston shock damper design. | 10th Jan 1931 | West Wittering \ V \ October1930-February1931 Scan195 | |
| Proposed modifications to a piston for an epicyclic 3rd-speed gearbox with revised vacuum control. | 10th Jan 1931 | West Wittering \ V \ October1930-February1931 Scan196 | |
| Design and production problems, discussing the need for more economical production to compete with the USA. | 10th Jan 1931 | West Wittering \ V \ October1930-February1931 Scan197 | |
| The conclusion of a report thanking Mr. Hives and recommending strengthening the purely technical staff. | 11th Jan 1931 | West Wittering \ V \ October1930-February1931 Scan198 | |
| Design specifications for the 25HP model, covering the back axle, gearbox, and radiator. | 11th Jan 1931 | West Wittering \ V \ October1930-February1931 Scan199 | |
| Improvements for thermostatically controlled radiator shutters to manage water temperature and improve carburation. | 1st Jan 1931 | West Wittering \ V \ October1930-February1931 Scan200 | |
| Methods for interior car heating, preferring hot water over exhaust systems. | 11th Jan 1931 | West Wittering \ V \ October1930-February1931 Scan201 | |
| Connecting rod length for the Improved 25HP engine, analysing vibration and comparing ratios. | 11th Jan 1931 | West Wittering \ V \ October1930-February1931 Scan202 | |
| Engine connecting rod lengths and ratios for different engine types. | 13th Jan 1931 | West Wittering \ V \ October1930-February1931 Scan203 | |
| The preliminary general arrangement for a 28HP engine, detailing modifications and design particulars. | 13th Jan 1931 | West Wittering \ V \ October1930-February1931 Scan204 | |
| Re-design of the engine mounting for the improved 25HP chassis. | 13th Jan 1931 | West Wittering \ V \ October1930-February1931 Scan205 | |
| Requesting modifications to the Phantom 2's thermo-operated shutters and radiator tank. | 1st Jan 1930 | West Wittering \ V \ October1930-February1931 Scan206 | |
| Causes of ignition coil failure and potential design improvements. | 15th Jan 1931 | West Wittering \ V \ October1930-February1931 Scan207 | |
| Comparison of ignition coil insulation with American counterparts, discussing potential improvements through methods like vacuum impregnation and oil filling. | 15th Jan 1931 | West Wittering \ V \ October1930-February1931 Scan208 | |
| Proposed modification to the design of hydraulic shock dampers, focusing on the piston and side links. | 15th Jan 1931 | West Wittering \ V \ October1930-February1931 Scan209 | |
| Hand-drawn sketch of a mechanical assembly with design notes. | 15th Jan 1931 | West Wittering \ V \ October1930-February1931 Scan210 | |
| Strategy for patent renewals, favoring numerous inexpensive, defensive patents. | 15th Jan 1931 | West Wittering \ V \ October1930-February1931 Scan211 | |
| Design of the Japan 3 crankshaft damper and spring drive. | 15th Jan 1931 | West Wittering \ V \ October1930-February1931 Scan212 | |
| With a diagram proposing modifications to the front engine suspension for the 'Japan 3' model. | 15th Jan 1931 | West Wittering \ V \ October1930-February1931 Scan213 | |
| Proposed modifications to the rear axle, bearings, and brake gear due to an increase in engine power. | 16th Jan 1931 | West Wittering \ V \ October1930-February1931 Scan214 | |
| Query regarding the replacement of a roller bearing with a ball bearing on a gearbox reverse shaft. | 16th Jan 1931 | West Wittering \ V \ October1930-February1931 Scan215 | |
| Advantages and disadvantages of long versus short connecting rods in 25HP and 45HP car engines. | 16th Jan 1931 | West Wittering \ V \ October1930-February1931 Scan216 | |
| Responding to Mr. Elliott, discussing the relationship between the rod length to crank radius ratio and its effects on engine forces and flywheel inertia. | 4th Jun 1934 | West Wittering \ V \ October1930-February1931 Scan217 | |
| Flywheel vibrations at high speeds and proposed solutions involving stiffer shafts or double bearings. | 4th Jun 1934 | West Wittering \ V \ October1930-February1931 Scan218 | |
| Pros and cons of magneto ignition versus battery ignition systems. | 17th Jan 1931 | West Wittering \ V \ October1930-February1931 Scan219 | |
| Approval of a dashboard drawing. | 7th Jan 1931 | West Wittering \ V \ October1930-February1931 Scan220 | |
| Value of magneto reserve ignition and proposing a switch to a double battery system. | 17th Jan 1931 | West Wittering \ V \ October1930-February1931 Scan221 | |
| Request from America for silver instrument dials instead of black ones. | 19th Jan 1931 | West Wittering \ V \ October1930-February1931 Scan222 | |
| Dispatch of a replacement print showing a horizontal section of a Japan 3 cylinder head. | 19th Jan 1931 | West Wittering \ V \ October1930-February1931 Scan223 | |
| Longer experimental pistons for the P.2 engine, with reference to accompanying illustrations. | 20th Jan 1931 | West Wittering \ V \ October1930-February1931 Scan224 | |
| Torque reaction vibrations at low speeds and an engine firing in the silencer on a 45HP car. | 20th Jan 1931 | West Wittering \ V \ October1930-February1931 Scan225 | |
| The Japan 3 cylinder head, discussing starting torque and compression ratio. | 20th Jan 1931 | West Wittering \ V \ October1930-February1931 Scan226 | |
| Proposal to use a right-hand drive engine in a left-hand drive 'Japan 3' chassis. | 20th Jan 1931 | West Wittering \ V \ October1930-February1931 Scan227 | |
| Design improvements for the 'Japan Engine', focusing on crankshafts, vibration, engine torque arms, and radiator mounting. | 21th Jan 1931 | West Wittering \ V \ October1930-February1931 Scan228 | |
| Design sketch for a starter handle shaft and a confirmation of a telegram regarding design simplification. | 21th Jan 1931 | West Wittering \ V \ October1930-February1931 Scan229 | |
| Suitability of an American-style folding arm luggage carrier for European customers and comparing market requirements. | 22th Jan 1931 | West Wittering \ V \ October1930-February1931 Scan230 | |
| Design and location of a toolbox, customer objections, and its proposed contents. | 22th Jan 1931 | West Wittering \ V \ October1930-February1931 Scan231 | |
| Confirmation of a telegram suggesting tests on China crankshafts with different pin diameters. | 22th Jan 1931 | West Wittering \ V \ October1930-February1931 Scan232 | |
| Design revisions for the 'Japan 3' engine scheme, including shaft diameters and cylinder skirts. | 22th Jan 1931 | West Wittering \ V \ October1930-February1931 Scan233 | |
| Preferred arrangement of battery cells based on width, referencing a National Accumulator catalogue. | 23th Jan 1931 | West Wittering \ V \ October1930-February1931 Scan234 | |
| More cost-effective and higher capacity battery for the Japan 3 model. | 23th Jan 1931 | West Wittering \ V \ October1930-February1931 Scan235 | |
| Magneto ignition issues, coil insulation, and spark plug gap settings for 25HP and 45HP cars. | 23th Jan 1931 | West Wittering \ V \ October1930-February1931 Scan236 | |
| Design and modifications for a petrol tank for the 'Japan 3' project. | 23th Jan 1931 | West Wittering \ V \ October1930-February1931 Scan237 | |
| Alternative reverse gear designs for the Japan 3 gearbox. | 23th Jan 1931 | West Wittering \ V \ October1930-February1931 Scan238 | |
| Hand-drawn schematic of a gearbox design with annotations. | 24th Jan 1931 | West Wittering \ V \ October1930-February1931 Scan239 | |
| Design modifications for torque arms, engine suspension, and gears. | 24th Jan 1931 | West Wittering \ V \ October1930-February1931 Scan240 | |
| Referencing a print of a Japan crankshaft with a pinion formed solid with the shaft. | 24th Jan 1931 | West Wittering \ V \ October1930-February1931 Scan241 | |
| Potential design simplifications and improvements for the Japan 3 engine. | 25th Jan 1931 | West Wittering \ V \ October1930-February1931 Scan242 | |
| Design proposals for an eccentrically engaged reverse gear mechanism, with sketches. | 25th Jan 1931 | West Wittering \ V \ October1930-February1931 Scan243 | |
| Potential gearbox design modifications, including a simplified diagram of a gear layout. | 25th Jan 1931 | West Wittering \ V \ October1930-February1931 Scan244 | |
| Sketch of a 'Swinging Reverse' mechanism, labelled as Sketch 1. | 25th Jan 1931 | West Wittering \ V \ October1930-February1931 Scan245 | |
| Urgent final recommendation sketch for a shaft and pinion assembly. | 26th Jan 1931 | West Wittering \ V \ October1930-February1931 Scan246 | |
| Designs for crankshaft pinion timing gears and a proposed modification to an existing 25HP engine to cure flywheel vibration. | 26th Jan 1931 | West Wittering \ V \ October1930-February1931 Scan247 | |
| Comparison of four different designs for a journal and flywheel flange. | 27th Jan 1931 | West Wittering \ V \ October1930-February1931 Scan248 | |
| Sending an experimental double rear crank bearing for testing on a 20/25 engine. | 27th Jan 1931 | West Wittering \ V \ October1930-February1931 Scan249 | |
| Cover note for a blueprint detailing a proposed arrangement of units for both right and left-hand chassis. | 27th Jan 1931 | West Wittering \ V \ October1930-February1931 Scan250 | |
| Chassis modifications and drawings for the Continental Touring 20/25 model. | 27th Jan 1931 | West Wittering \ V \ October1930-February1931 Scan251 | |
| Proposed rear road springs for the 20/25 HP Continental Touring Chassis. | 28th Jan 1931 | West Wittering \ V \ October1930-February1931 Scan252 | |
| Failure of a low inertia slipper wheel (crankshaft damper disc) and suggesting design improvements to strengthen it. | 28th Jan 1931 | West Wittering \ V \ October1930-February1931 Scan253 | |
| Design proposals and challenges for the Japan 3 engine components, including the crankshaft, flywheel, and gear arrangements. | 28th Jan 1931 | West Wittering \ V \ October1930-February1931 Scan254 | |
| Design notes and sketches for various mechanical components, including a nose support and crankshaft assembly. | 27th Oct 1937 | West Wittering \ V \ October1930-February1931 Scan255 | |
| Modifying the crankcase oil filler to be larger, allowing oil to be poured directly from a can. | 26th Jan 1931 | West Wittering \ V \ October1930-February1931 Scan256 | |
| Scheme 3025 for the Phantom II exhaust system, reverting to an original design for holding down bolts. | 28th Jan 1930 | West Wittering \ V \ October1930-February1931 Scan257 | |
| Cost-saving modifications to the spring anchorages for the Japan 3 model. | 29th Jan 1931 | West Wittering \ V \ October1930-February1931 Scan258 | |
| Phantom II exhaust system and a new design for the aluminium silencer cutout. | 29th Jan 1930 | West Wittering \ V \ October1930-February1931 Scan259 | |
| Design choices for the Japan 3 engine, including ignition, governors, and connecting rod lengths. | 29th Jan 1931 | West Wittering \ V \ October1930-February1931 Scan260 | |
| Summary of a letter discussing engine design schemes, vibrations, and a proposal for a new, larger capacity engine as a response to competitors. | 29th Jan 1931 | West Wittering \ V \ October1930-February1931 Scan261 | |
| Engine and flywheel vibration issues in various car designs. | 7th Nov 1925 | West Wittering \ V \ October1930-February1931 Scan262 | |
| Engine balance, crankshaft stresses, high revolutions, and steering issues. | 29th Jan 1931 | West Wittering \ V \ October1930-February1931 Scan263 | |
| On the Japan 3 engine design, comparing 6-cylinder and 12-cylinder options. | 29th Jan 1931 | West Wittering \ V \ October1930-February1931 Scan264 | |
| Potential modifications to the front end of a vehicle frame for 'Japan 3'. | 29th Jan 1931 | West Wittering \ V \ October1930-February1931 Scan265 | |
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