| Description | Date | Identifier | |
| Gearbox changing, silence, and the potential adoption of a freewheel system. | 15th Jan 1930 | Box 15 \ 5 Scan105 | |
| Technical discussion on gearbox performance, noise, and comparisons with Graham-Paige, Chrysler, and Armstrong-Siddeley models. | 15th Jan 1930 | Box 15 \ 5 Scan106 | |
| Significant oil loss from the Phantom II gearbox compared to the Phantom I. | 16th Jan 1930 | Box 15 \ 5 Scan107 | |
| Excessive oil loss from a Phantom II gearbox. | 17th Jan 1930 | Box 15 \ 5 Scan108 | |
| Comparing calculations on various gearbox types to determine relative noise levels. | 20th Jan 1930 | Box 15 \ 5 Scan109 | |
| 'plucking' issue with the Phantom II gearbox during dynamometer testing. | 10th Feb 1930 | Box 15 \ 5 Scan110 | |
| Gearbox problem, reviewing existing solutions and proposing a new design. | 10th Feb 1930 | Box 15 \ 5 Scan111 | |
| Different transmission control schemes, including clutches, brakes, and freewheeling. | 10th Feb 1930 | Box 15 \ 5 Scan112 | |
| New gearbox design, detailing clutches, speed rings, pawls, and potential patentable claims. | 21th Feb 1930 | Box 15 \ 5 Scan113 | |
| Alternative schemes for altering the direct leverage braking system on S.S. cars. | 21th Feb 1930 | Box 15 \ 5 Scan114 | |
| Technical memorandum discussing problems and preliminary designs for a full epicyclic gearbox. | 12th Apr 1930 | Box 15 \ 5 Scan115 | |
| Investigation into different gear train arrangements to achieve a necessary ratio. | 12th Apr 1930 | Box 15 \ 5 Scan116 | |
| Technical document detailing the design and control of a synchro-mesh gearbox system, including patent applications. | 1st Apr 1930 | Box 15 \ 5 Scan117 | |
| Analysis of braking and gear change mechanisms, including torque calculations and potential control improvements. | 2nd Apr 1930 | Box 15 \ 5 Scan118 | |
| Gearbox and clutch design to address issues during coasting. | 2nd Apr 1930 | Box 15 \ 5 Scan119 | |
| Three gearbox schemes with accompanying blueprint diagrams. | 4th Apr 1930 | Box 15 \ 5 Scan120 | |
| Technical discussion on gearbox and clutch modifications and comparisons. | 4th Apr 1930 | Box 15 \ 5 Scan121 | |
| Investigations into car gear problems and proposing a new scheme. | 29th Apr 1930 | Box 15 \ 5 Scan122 | |
| Gearbox design alternatives, comparing pinion trains, gear ratios, and clutch systems. | 29th Apr 1930 | Box 15 \ 5 Scan123 | |
| The design and control of an epicyclic gearbox, including servo-assisted shifting. | 29th Apr 1930 | Box 15 \ 5 Scan124 | |
| Servos for sequential gear changes and an alternative freewheel sideshaft. | 29th Apr 1930 | Box 15 \ 5 Scan125 | |
| Technical memo discussing improvements to the change gear mechanism using jaw clutches and resilient couplings. | 29th Apr 1930 | Box 15 \ 5 Scan126 | |
| Requesting results on the application of a Salerni coupling to EAC.7 gearboxes. | 7th May 1930 | Box 15 \ 5 Scan127 | |
| Various gearbox design problems and proposed schemes. | 26th May 1930 | Box 15 \ 5 Scan128 | |
| Technical memorandum discussing automatic gear change systems, comparing a proposed design to the Wilson gearbox. | 28th May 1930 | Box 15 \ 5 Scan129 | |
| Plunger springs in the L.H. P.2 gearbox central levers providing insufficient load, with proposals for alteration. | 28th May 1930 | Box 15 \ 5 Scan130 | |
| Condition of Phantom II gearbox gears after dynamometer testing with and without Whitmores compound. | 30th May 1930 | Box 15 \ 5 Scan131 | |
| Failure of a free-wheel system for the third gear and the decision not to apply it to the Phantom car. | 2nd Jun 1930 | Box 15 \ 5 Scan132 | |
| Testing Phantom II gearboxes with Whitmore's and Price's compounds. | 11th Jun 1930 | Box 15 \ 5 Scan133 | |
| The use of Whitmore's and Price's lubricating compounds in Phantom II gearboxes and axles. | 12th Jun 1930 | Box 15 \ 5 Scan134 | |
| Experiment with an easy change gear system using a constant mesh double helical gear. | 2nd Jul 1930 | Box 15 \ 5 Scan135 | |
| The failure of the free-wheel on the 25 HP model and the need for a modified design. | 2nd Jul 1930 | Box 15 \ 5 Scan136 | |
| The unsuitability of a compound in Phantom II gearboxes due to electrolytic action. | 2nd Jul 1930 | Box 15 \ 5 Scan137 | |
| Extract from a report regarding the necessity of the gearbox undershield. | 23th Jul 1930 | Box 15 \ 5 Scan138 | |
| Reminder note about Silent Third Gear and a query regarding the purchase of a Graham Paige vehicle. | 30th Jul 1930 | Box 15 \ 5 Scan139 | |
| Methods to prevent oil leakage from the back of 20/25 HP and 40/50 HP gearboxes. | 20th Aug 1930 | Box 15 \ 5 Scan140 | |
| Drawing of a 3rd motion shaft bearing housing and oil return passage for a 40/50 HP chassis. | 20th Dec 1920 | Box 15 \ 5 Scan141 | |
| Urgent improvements to the gearbox, specifically the 2nd and 3rd gears, for the Phantom engine. | 22th Aug 1930 | Box 15 \ 5 Scan142 | |
| Evaluation of competitor gearboxes from Studebaker and Graham Paige. | 29th Aug 1930 | Box 15 \ 5 Scan143 | |
| Development of a silent third gear, referencing competitor cars and advocating for a simple epicyclic gear scheme. | 1st Sep 1930 | Box 15 \ 5 Scan144 | |
| Summary comparing different change gear schemes, including jaw clutch and epicyclic units, as a basis for future work. | 1st Sep 1930 | Box 15 \ 5 Scan145 | |
| Comparative analysis of spool gear, freewheel & jaw clutch, and synchro-mesh transmission schemes. | 1st Sep 1930 | Box 15 \ 5 Scan146 | |
| Continued page of a report discussing an epicyclic gear design and the associated development work. | 1st Sep 1930 | Box 15 \ 5 Scan147 | |
| Various gearbox schemes for a silent third gear. | 2nd Sep 1930 | Box 15 \ 5 Scan148 | |
| Competitor's car, the Graham Paige, comparing it to the Phantom II and proposing an experiment in engine block casting. | 2nd Sep 1930 | Box 15 \ 5 Scan149 | |
| Oil leakage from the back of 20/25 and 40/50 gearboxes, focusing on oil thrower and drain hole design. | 2nd Sep 1930 | Box 15 \ 5 Scan150 | |
| 'Sg.' to 'Hs.' discussing the development of a silent third gear versus an epicyclic gear. | 8th Sep 1930 | Box 15 \ 5 Scan151 | |
| Problems with the Phantom II Left Hand Chassis, specifically the radiator, thermostat shutters, gearbox, and clutch, following endurance testing. | 1st Sep 1930 | Box 15 \ 5 Scan152 | |
| Technical report on modifications to the clutch, carburetter, and brakes for experimental cars. | 9th Sep 1930 | Box 15 \ 5 Scan153 | |
| Different schemes and trials for a silent third gear system. | 9th Sep 1930 | Box 15 \ 5 Scan154 | |
| Different design schemes and modifications for a gearbox problem. | 1st Oct 1930 | Box 15 \ 5 Scan155 | |
| Technical comparison of various automotive gear and clutch systems. | 2nd Oct 1930 | Box 15 \ 5 Scan156 | |
| Various 'easy change' gearbox schemes following a visit to West Wittering. | 2nd Oct 1930 | Box 15 \ 5 Scan157 | |
| Discussion about a gearbox from the U.S.A. and a plan to fit Maybach type clutches. | 2nd Oct 1930 | Box 15 \ 5 Scan158 | |
| Seeking clarification on various 'easy change' gearbox schemes, referencing the Phantom II and Maybach clutches. | 3rd Oct 1930 | Box 15 \ 5 Scan159 | |
| Proposed epicyclic gear and the fitting of Maybach clutches to the Phantom I gearbox. | 4th Oct 1930 | Box 15 \ 5 Scan160 | |
| Requesting the construction of a specimen epicyclic 3rd speed gear train for testing purposes. | 4th Oct 1930 | Box 15 \ 5 Scan161 | |
| Confirming the dispatch of drawings for a revised epicyclic 3rd speed gearbox for testing purposes. | 13th Oct 1930 | Box 15 \ 5 Scan162 | |
| Revised epicyclic 3rd speed gearbox and associated schematics. | 16th Oct 1930 | Box 15 \ 5 Scan163 | |
| Revised drawing for the epicyclic third gearbox, noting a change in the joint's position. | 25th Oct 1930 | Box 15 \ 5 Scan164 | |
| Modification to jaw clutches for the revised epicyclic third-speed gearbox. | 29th Oct 1930 | Box 15 \ 5 Scan165 | |
| Modification to the 1st speed dogs for the all-epicyclic gearbox. | 29th Oct 1930 | Box 15 \ 5 Scan166 | |
| Revisions to an epicyclic 3rd speed gearbox, focusing on the oil pump and an experimental shaft shaping for lubrication. | 31th Oct 1930 | Box 15 \ 5 Scan167 | |
| Revisions to the epicyclic 3rd speed gearbox, superseding a previous scheme. | 11th Nov 1930 | Box 15 \ 5 Scan168 | |
| Current position and assessment of various change gear technologies. | 3rd Nov 1930 | Box 15 \ 5 Scan169 | |
| Technical discussion on various gearbox schemes and the development of a new gear system. | 3rd Nov 1930 | Box 15 \ 5 Scan170 | |
| Gearbox design, detailing the move from a 2-speed to a 3-speed system with pre-selection. | 4th Nov 1930 | Box 15 \ 5 Scan171 | |
| Modifications and additions for the revised epicyclic 3rd speed gearbox. | 4th Nov 1930 | Box 15 \ 5 Scan172 | |
| Revisions to the Epicyclic 3rd speed gearbox, including details on clutch components and a request to investigate an 8.5' fabric coupling. | 7th Nov 1930 | Box 15 \ 5 Scan173 | |
| Revised epicyclic 3rd speed gearbox and associated modifications. | 7th Nov 1930 | Box 15 \ 5 Scan174 | |
| Revisions to the epicyclic 3rd speed gearbox, affecting the inspection cover and vacuum control cylinder. | 11th Nov 1930 | Box 15 \ 5 Scan175 | |
| Epicyclic third gear schemes for the Phantom II gearbox. | 11th Nov 1930 | Box 15 \ 5 Scan176 | |
| Using an epicyclic gearbox, limiting it to four speeds instead of the possible six. | 11th Nov 1930 | Box 15 \ 5 Scan177 | |
| Proposal to shorten the oil pump on the Epicyclic 3rd Speed Gearbox to allow a rocker shaft to pass. | 12th Nov 1930 | Box 15 \ 5 Scan178 | |
| Proposed assembly procedure for an Epicyclic 3rd speed gearbox. | 12th Nov 1930 | Box 15 \ 5 Scan179 | |
| Development of a quieter epicyclic gearbox, considering helical gears and synchronous mesh systems. | 20th Dec 1930 | Box 15 \ 5 Scan180 | |
| Work on a steering column for a vacuum control pre-selection scheme. | 20th Dec 1930 | Box 15 \ 5 Scan181 | |
| Questioning the change from a roller bearing to a ball bearing on the reverse shaft of a gearbox. | 16th Jan 1931 | Box 15 \ 5 Scan182 | |
| The type of bearing used on the Phantom II gearbox reverse shaft. | 20th Jan 1931 | Box 15 \ 5 Scan183 | |
| Rusting and seizing issues with the change speed mechanism, with a warning about dismantling. | 9th Feb 1931 | Box 15 \ 5 Scan184 | |
| Complaint of rust on the left-hand chassis change speed mechanism and a proposed solution. | 10th Feb 1931 | Box 15 \ 5 Scan185 | |
| Prevention of rust in the change gear mechanism by addressing electrolyte issues and applying protective measures. | 12th Feb 1931 | Box 15 \ 5 Scan186 | |
| The side lever mechanism for the epicyclic 3rd speed gearbox. | 14th Feb 1931 | Box 15 \ 5 Scan187 | |
| The completion status of the epicyclic 3rd speed gearbox and the dispatch of related prints. | 14th Feb 1931 | Box 15 \ 5 Scan188 | |
| Revisions to the steering column controls for the P.2. epicyclic 3rd speed gearbox. | 19th Feb 1931 | Box 15 \ 5 Scan189 | |
| Original schemes for controls of an epicyclic 3rd speed gearbox vacuum cylinder. | 23th Feb 1931 | Box 15 \ 5 Scan190 | |
| Modifications to the 'Maybach dogs' on an epicyclic 3rd speed gearbox to avoid a clicking sound during synchronisation. | 23th Feb 1931 | Box 15 \ 5 Scan191 | |
| Required alterations to the easy change silent gearbox designs for the 40/50 and 25 HP models. | 2nd Mar 1931 | Box 15 \ 5 Scan192 | |
| Modifying Maybach jaws on an epicyclic 3rd speed gearbox after driving experience with 14-EX. | 3rd Mar 1931 | Box 15 \ 5 Scan193 | |
| Progress and design choices for gearboxes, comparing a simple design with Maybach and epicyclic options. | 9th Mar 1931 | Box 15 \ 5 Scan194 | |
| Testing a separate gearbox for the Phantom II by fitting it to the 19-EX car. | 17th Mar 1931 | Box 15 \ 5 Scan195 | |
| Modifications to the epicyclic third-speed gearbox controls regarding the height of the quadrant and lever finger grips. | 30th Mar 1931 | Box 15 \ 5 Scan196 | |
| Preliminary test results on an epicyclic easy change gearbox with a vacuum controlled twin top change gear. | 31th Mar 1931 | Box 15 \ 5 Scan197 | |
| Technical report on gearbox noise and gear change issues, particularly concerning epicyclic third gear and Maybach dogs. | 31th Mar 1931 | Box 15 \ 5 Scan198 | |
| Gearbox issues, including a 'clonk' sound, complicated gear changes, and proposals for gear improvements. | 31th Mar 1931 | Box 15 \ 5 Scan199 | |
| Altering the steering column controls for the epicyclic third-speed gearbox on car 27-EX. | 26th Mar 1931 | Box 15 \ 5 Scan200 | |
| Alteration of the Maybach dogs on the epicyclic gearbox for vehicle 27-EX. | 1st Apr 1931 | Box 15 \ 5 Scan201 | |
| Crash noises and potential modifications for an epicyclic 3rd speed gearbox. | 2nd Apr 1931 | Box 15 \ 5 Scan202 | |
| Challenges and design considerations of a 'double top' epicyclic gearbox scheme. | 4th Mar 1931 | Box 15 \ 5 Scan203 | |
| Typed memo discussing engine and gearbox mechanics, specifically gear changes and corner over-run. | 7th Apr 1931 | Box 15 \ 5 Scan204 | |
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