| Description | Date | Identifier | |
| Modification to the rear end of the 2nd motion shaft on the 40/50 'W' series gearbox. | 3rd Jul 1925 | Box 66 \ 4 scan0200 | |
| Halving the centralising spring load for the change speed lever and modifying the design of locating plungers. | 7th Jul 1925 | Box 66 \ 4 scan0201 | |
| Changes to the gearbox change lever and gate mechanism for chassis LEC.2109. | 7th Sep 1925 | Box 66 \ 4 scan0202 | |
| Improvements for a gearbox, specifically silent direct drive engagement and a roller spigot bearing. | 14th Jul 1925 | Box 66 \ 4 scan0203 | |
| Design of the gearbox change speed mechanism, specifically the plunger and slider, to prevent 'catchiness'. | 14th Jul 1925 | Box 66 \ 4 scan0204 | |
| Modifications to the 'W' series 40/50 gearbox and the servo worm shaft bearing housing. | 14th Jul 1925 | Box 66 \ 4 scan0205 | |
| Cancelled design for a gearbox oil filler and seeking information about a proposed oil level cock. | 14th Jul 1925 | Box 66 \ 4 scan0206 | |
| Proposed modifications to a speedometer drive casing and a change speed lever bracket, referencing blueprint G.51708. | 14th Jul 1925 | Box 66 \ 4 scan0207 | |
| Explaining why the oil level cock was abandoned on the 40/50 gearbox. | 18th Jul 1925 | Box 66 \ 4 scan0208 | |
| Issues with control ball joints coming loose and proposed modifications to drawings and tolerances. | 1st Aug 1925 | Box 66 \ 4 scan0209 | |
| Issue with the 'Phantom' gearbox where pinions work out under power. | 9th Oct 1925 | Box 66 \ 4 scan0210 | |
| Modifications to the New Phantom chassis and their objectives. | 15th Oct 1925 | Box 66 \ 4 scan0211 | |
| Decision to use a 4-speed gearbox over a 3-speed, citing buyer preference and overcoming previous objections. | 19th Oct 1925 | Box 66 \ 4 scan0212 | |
| Fitting of large pitch continuous gears into a new Phantom gearbox to test for humming. | 23th Oct 1925 | Box 66 \ 4 scan0213 | |
| Modifications to a gearbox and a spring to correct a 'shooting out' gear issue. | 28th Oct 1925 | Box 66 \ 4 scan0214 | |
| Frame stiffness, a proposed tie-rod test, and the merits of a separate gearbox design on the 40/50 HP chassis. | 18th Nov 1925 | Box 66 \ 4 scan0215 | |
| Standardisation of 1st and 2nd speed pinions to be made torsionally free to prevent gears working out. | 10th Dec 1925 | Box 66 \ 4 scan0216 | |
| Gearbox issues on the 'New Phantom' model in tropical conditions. | 10th Feb 1926 | Box 66 \ 4 scan0217 | |
| Implementation of new side levers and torsionally free gears on the New Phantom and B.2 chassis. | 23th Feb 1926 | Box 66 \ 4 scan0218 | |
| Provision for friction in the new Phantom link and balance gear. | 1st Mar 1926 | Box 66 \ 4 scan0219 | |
| Provision of friction in the New Phantom swing link and balance gear. | 1st Mar 1926 | Box 66 \ 4 scan0220 | |
| Noise from gear boxes, known as 'Bricks or Nuts'. | 19th Mar 1926 | Box 66 \ 4 scan0221 | |
| Investigation into gear box noises, described as 'bricks in the gear box', believed to be located in the ball bearing. | 23th Mar 1926 | Box 66 \ 4 scan0222 | |
| Development of a lighter clutch and gearbox for the Phantom model, and comparing with the Silver Ghost. | 7th Apr 1926 | Box 66 \ 4 scan0223 | |
| Modifications to a gearbox due to an oversight concerning torsionally free pinions. | 29th Apr 1926 | Box 66 \ 4 scan0224 | |
| Table of 40/50 HP chassis gear ratios, speeds, and engine revolutions. | 1st May 1926 | Box 66 \ 4 scan0225 | |
| Phantom back axle ratio, comparing 14 and 15 tooth axles for different markets. | 10th Jun 1926 | Box 66 \ 4 scan0226 | |
| Provision of high gear ratios for 40/50 HP and 20 HP cars. | 16th Nov 1926 | Box 66 \ 4 scan0227 | |
| Mr. Royce inquiring about the standardisation of a toothed clutch for the Phantom Gearbox. | 13th Dec 1926 | Box 66 \ 4 scan0228 | |
| With a diagram regarding modifications to the plunger notches on the Phantom Gearbox. | 14th Dec 1926 | Box 66 \ 4 scan0229 | |
| Testing and re-instruction of a toothed direct drive motion shaft for Phantom Gear Boxes. | 16th Dec 1926 | Box 66 \ 4 scan0230 | |
| The internal and external toothed direct drive for the Phantom Gearbox. | 20th Dec 1926 | Box 66 \ 4 scan0231 | |
| Standardisation of chassis parts for an improved silent direct drive engagement and roller spigot bearing. | 19th Jan 1927 | Box 66 \ 4 scan0232 | |
| Improved silent direct drive engagement and roller spigot bearing. | 4th Jun 1927 | Box 66 \ 4 scan0233 | |
| Standardising the gearbox oil level and the procedure for checking it to minimise leaks. | 16th Feb 1927 | Box 66 \ 4 scan0234 | |
| Technical memorandum discussing the design and specifications of hypoid gears, including off-set dimensions and gear ratios. | 14th Apr 1927 | Box 66 \ 4 scan0235 | |
| Issues with speedometer drive squares twisting off due to the load from the mechanically driven screen wiper. | 14th May 1927 | Box 66 \ 4 scan0236 | |
| Performance of speed indicators and the design preferences for instrument dials. | 19th Aug 1927 | Box 66 \ 4 scan0237 | |
| Modifications to the speedometer drive for Phantom and India models. | 1st Aug 1927 | Box 66 \ 4 scan0238 | |
| Proposing new gear ratios for a sports car to improve performance. | 22th Sep 1927 | Box 66 \ 4 scan0239 | |
| Adaptation of an improved clutch to an engine with a new crankcase. | 22th Oct 1927 | Box 66 \ 4 scan0240 | |
| Clarifying the gear lever length and position for 40/50 HP 'C' steering Phantoms. | 1st Dec 1927 | Box 66 \ 4 scan0241 | |
| Questioning the unrecorded change in position of the 'C' type gear lever relative to the dash. | 2nd Dec 1927 | Box 66 \ 4 scan0242 | |
| Issues with the New Phantom's sliding gear control, specifically the weak centralizing force of the gear lever. | 6th Dec 1927 | Box 66 \ 4 scan0243 | |
| Standardization history of the 40/50 HP gear lever and 'C' type steering. | 6th Dec 1927 | Box 66 \ 4 scan0244 | |
| Requesting the speedometer drive ratio for an EAC.10 gearbox, with handwritten ratio calculations. | 7th Dec 1927 | Box 66 \ 4 scan0245 | |
| Modified scheme for the New Phantom sliding gear control submitted to the Experimental Department for testing. | 8th Dec 1927 | Box 66 \ 4 scan0246 | |
| Requesting an update on the status of the New Phantom Sliding Gear Control job. | 13th Dec 1927 | Box 66 \ 4 scan0247 | |
| Proposal to reduce the speedometer drive speed by 30%. | 13th Dec 1927 | Box 66 \ 4 scan0248 | |
| Note on the practice of removing gearboxes from the 20 HP chassis without removing the engine. | 23th Jan 1928 | Box 66 \ 4 scan0249 | |
| Specifying the speedometer calibration for the 12-EX chassis. | 22th Mar 1928 | Box 66 \ 4 scan0250 | |
| Letter expressing surprise about the need for new reduction gears for 40/50 HP speedometers. | 18th Jul 1928 | Box 66 \ 4 scan0251 | |
| Modifications to accommodate a new type of speedometer for the 40/50 HP model. | 19th Jul 1928 | Box 66 \ 4 scan0252 | |
| Rattle from the engine gears on the Phantom chassis and a proposed solution. | 27th Jul 1928 | Box 66 \ 4 scan0253 | |
| Standardisation of a small dial speedometer for the 40/50 model, incorporating a new temperature compensating device. | 3rd Sep 1928 | Box 66 \ 4 scan0254 | |
| Implementation of a new part on a chassis, including test date and costs. | 24th Sep 1928 | Box 66 \ 4 scan0255 | |
| Options for improving vehicle acceleration, including supercharging, engine power, and gearbox design. | 7th Nov 1928 | Box 66 \ 4 scan0256 | |
| Proposal for a 4-speed gearbox system using an epicyclic unit to achieve a silent 3rd gear. | 1st May 1929 | Box 66 \ 4 scan0257 | |
| Customer complaint regarding a noise from the transmission, concluding it's a trivial design issue and recommending a visit to explain it. | 1st May 1929 | Box 66 \ 4 scan0258 | |
| Scheme for a silent 3rd speed gearbox for a Phantom, using a single and double helical arrangement. | 2nd Jun 1929 | Box 66 \ 4 scan0259 | |
| Test report on a Phantom 1 gearbox with a continuous helical 3rd speed. | 5th Dec 1929 | Box 66 \ 4 scan0260 | |
| Abandoning side notches in the gear change quadrant for the Northcliffe scheme. | 13th Aug 1924 | Box 66 \ 4 scan0261 | |
| The Northcliffe chassis being dismantled as its parts are being used for engine experiments. | 15th Aug 1924 | Box 66 \ 4 scan0262 | |
| Simplified striking mechanism design. | 15th Mar 1924 | Box 66 \ 4 scan0263 | |
| Secret memo describing the locating plungers for a simplified striking mechanism. | 15th Aug 1924 | Box 66 \ 4 scan0264 | |
| Secret memo regarding drawing N.sch.1832, showing driving seat positions and modifications to the scuttle. | 24th Aug 1924 | Box 66 \ 4 scan0265 | |
| Secret memo from A.J. Stent detailing modifications to gearbox sliders for a chassis. | 16th Aug 1924 | Box 66 \ 4 scan0266 | |
| Requesting a test date for the E.A.C.II gearbox design before proceeding further with development. | 20th Aug 1924 | Box 66 \ 4 scan0267 | |
| Arranging the delivery of a car fitted with a specific change gear mechanism to London. | 21th Aug 1924 | Box 66 \ 4 scan0268 | |
| Short internal memo regarding an arrangement for the change gear mechanism. | 22th Aug 1924 | Box 66 \ 4 scan0269 | |
| Secret memo arranging for a car with a proposed new gear mechanism to be sent for evaluation. | 25th Aug 1924 | Box 66 \ 4 scan0270 | |
| Secret memo detailing design modifications to the change lever shaft for the 'V' EAC series underframe chassis. | 5th Mar 1925 | Box 66 \ 4 scan0271 | |
| Testing new change gear mechanism levers and gate on the 'New Phantom' car. | 22th Jul 1925 | Box 66 \ 4 scan0272 | |
| The new change gear and brake mechanism for the Phantom model, detailing steering configurations for different body types. | 23th Jul 1925 | Box 66 \ 4 scan0273 | |
| Solutions for loose control ball joints in levers, including modifications to drawings and dimensional tolerances. | 1st Aug 1925 | Box 66 \ 4 scan0274 | |
| Query regarding the expected delivery of a 'New Phantom' car with a new type of levers. | 13th Aug 1925 | Box 66 \ 4 scan0275 | |
| Suggestion to fit an aluminium casting to prevent hot air and gases from leaking into the car body through the change speed gate. | 20th Aug 1925 | Box 66 \ 4 scan0276 | |
| Experimental status of new change speed and brake levers for the New Phantom car. | 25th Aug 1925 | Box 66 \ 4 scan0277 | |
| The status of the new levers for the 'New Phantom' and confirming they await testing by Sales before production. | 1st Sep 1925 | Box 66 \ 4 scan0278 | |
| Note apologising for sending a previous document in error and requesting it be passed to Mr. Hives. | 5th Oct 1925 | Box 66 \ 4 scan0279 | |
| Follow-up communication regarding the status of new type levers and an instruction to hold production. | 2nd Oct 1925 | Box 66 \ 4 scan0280 | |
| Fumes entering the car body, particularly through the change speed lever gate. | 14th Oct 1925 | Box 66 \ 4 scan0281 | |
| Supply of a drawing for casing to prevent fumes in car bodies. | 24th Oct 1925 | Box 66 \ 4 scan0282 | |
| Standardisation of the change gear and brake operating mechanism. | 10th Dec 1925 | Box 66 \ 4 scan0283 | |
| Modifications to the change gear and brake operating mechanism. | 19th Jan 1926 | Box 66 \ 4 scan0284 | |
| Trial for a new type of change gear lever mechanism. | 8th Mar 1926 | Box 66 \ 4 scan0285 | |
| Criticizing the design of a gear change speed shaft, complete with a simple diagram. | 1st Feb 1927 | Box 66 \ 4 scan0286 | |
| Failure of a change speed lever shaft on the 7-EX car due to a manufacturing process error. | 2nd Feb 1927 | Box 66 \ 4 scan0287 | |
| From AJS regarding the breakage of a change gear shaft lever connection, attributing it to a design departure. | 11th Feb 1927 | Box 66 \ 4 scan0288 | |
| Notification to Mr. Coverley regarding the receipt of 6 Dust Excluders for a Universal Joint. | 24th Mar 1919 | Box 66 \ 4 scan0289 | |
| Experimental Dust Leather Spring for a 40/50 HP Chassis Universal Joint. | 25th Mar 1919 | Box 66 \ 4 scan0290 | |
| New drawings for the Internal Axle Control Sphere on the 40/50 HP Chassis Universal Joint. | 26th Mar 1919 | Box 66 \ 4 scan0291 | |
| Instruction to introduce new standard drawings for the External Axle Control Sphere on 'J.K.L & M' Chassis. | 26th Mar 1919 | Box 66 \ 4 scan0292 | |
| To Mr. Coverley from EFC confirming receipt of Dust Leathers for a Universal Joint. | 31th Mar 1919 | Box 66 \ 4 scan0293 | |
| To Mr Clark confirming receipt of parts from Messrs Gallenkamp & Co and Messrs Vaughtons Ltd. for experiments. | 9th Apr 1919 | Box 66 \ 4 scan0294 | |
| Requesting blueprints for drawing G.6352, the general arrangement of a universal joint for the 40/50 HP chassis. | 17th Apr 1919 | Box 66 \ 4 scan0295 | |
| Extract detailing the assembly parts and their corresponding S.S. Numbers for RE Chassis 1. E.X. | 30th Jun 1919 | Box 66 \ 4 scan0296 | |
| Chassis lubrication and wear following a thousand-mile test run, focusing on spring squeaks and the universal joint. | 28th Jul 1919 | Box 66 \ 4 scan0297 | |
| Chassis lubrication, bodywork adjustments, and quality issues. | 28th Jul 1919 | Box 66 \ 4 scan0298 | |
| Failures, knocking, and lubrication issues of the universal joint behind the gearbox. | 7th Aug 1920 | Box 66 \ 4 scan0299 | |
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