| Description | Date | Identifier | |
| List of parts and specifications for a Servo system. | 7th Jun 1935 | Box 94 \ 1 scan0139 | |
| The Spectre I car, detailing the fitting of a new gearbox and rectifying an issue with the hand brake cross rope. | 12th Jun 1935 | Box 94 \ 1 scan0140 | |
| Correcting a previous specification for Spectre gearboxes. | 12th Jun 1935 | Box 94 \ 1 scan0141 | |
| New rubber support design for the Spectre Gearbox to reduce cost. | 13th Jun 1935 | Box 94 \ 1 scan0142 | |
| Secret memo proposing a modification to the Spectre Gearbox to save weight and cost. | 15th Jun 1935 | Box 94 \ 1 scan0143 | |
| Proposed modifications to the Spectre Gearbox to save weight and cost. | 15th Jun 1935 | Box 94 \ 1 scan0144 | |
| Secret memorandum requesting a reduction in the strength of the gear lever centralising spring for the Spectre Gearbox. | 18th Jun 1935 | Box 94 \ 1 scan0145 | |
| Requesting a reduction in the strength of the gear lever centralising spring for the Spectre gearbox. | 18th Jun 1935 | Box 94 \ 1 scan0146 | |
| Secret memorandum regarding modifications to the change gear lever for the Spectre Gearbox. | 22th Jun 1935 | Box 94 \ 1 scan0147 | |
| Modification of the change gear lever for the Spectre Gearbox. | 22th Jun 1935 | Box 94 \ 1 scan0148 | |
| Page of handwritten calculations determining the gradient climbing ability for a Spectre model. | 1st Jul 1935 | Box 94 \ 1 scan0149 | |
| Gearbox relay and options for managing an unsynchronised first speed on the Spectre model. | 5th Jul 1935 | Box 94 \ 1 scan0150 | |
| Technical memo discussing the implications of a 3-speed gearbox, synchromesh, and reverse gear design. | 5th Jul 1935 | Box 94 \ 1 scan0151 | |
| The technical merits of using vacuum versus oil for a pre-selection gearbox system. | 5th Dec 1934 | Box 94 \ 1 scan0152 | |
| Performance graph comparing standard 4-speed and proposed 3-speed gear ratios for a Spectre vehicle. | 5th Dec 1934 | Box 94 \ 1 scan0153 | |
| Secret memorandum discussing a fault with the Spectre Gearbox interlock pin and proposed modifications. | 6th Jul 1935 | Box 94 \ 1 scan0154 | |
| Interlock pin issue with the Spectre Gearbox and proposing a modification. | 6th Jul 1935 | Box 94 \ 1 scan0155 | |
| Request to build a steel coupling for a Spectre gearbox to measure bending movement from misalignment. | 12th Jul 1935 | Box 94 \ 1 scan0156 | |
| Oil drag tests for the Spectre Gearbox 1-HS, comparing its performance to the 4-HS model. | 17th Jul 1935 | Box 94 \ 1 scan0157 | |
| Graph showing results of two performance tests on a Spectre Gear Box. | 11th Jul 1935 | Box 94 \ 1 scan0158 | |
| Oil drag test results for the Spectre 1HS gearbox, detailing power loss and torque measurements. | 11th Jul 1935 | Box 94 \ 1 scan0159 | |
| Oil loss prevention and lubrication issues in the Spectre gearbox. | 18th Jul 1935 | Box 94 \ 1 scan0160 | |
| Solutions for seizing shaft bushes in the Spectre Gearbox and requesting parts for experiments. | 6th Aug 1935 | Box 94 \ 1 scan0161 | |
| Defending the design of the Spectre Gearbox's synchromesh mechanism against criticism. | 10th Aug 1935 | Box 94 \ 1 scan0162 | |
| Modifications to be made to the Spectre II gearbox following a 10,000-mile test. | 12th Aug 1935 | Box 94 \ 1 scan0163 | |
| Secret memorandum discussing modifications to the Spectre Gearbox to prevent oil leaks. | 14th Aug 1935 | Box 94 \ 1 scan0164 | |
| Seizing issues and the design of the Spectre Gearbox compared to standard models. | 10th Aug 1935 | Box 94 \ 1 scan0165 | |
| With a sketch requesting further tests on the oil pumping capacity of screw threads. | 15th Aug 1935 | Box 94 \ 1 scan0166 | |
| New, stronger gearbox stay with flexible ends for the Spectre Gearbox. | 16th Aug 1935 | Box 94 \ 1 scan0167 | |
| Request to remove specific parts from a Spectre gearbox for rig tests. | 17th Aug 1935 | Box 94 \ 1 scan0168 | |
| Confirming modifications to be incorporated into the Spectre II Gearbox. | 17th Aug 1935 | Box 94 \ 1 scan0169 | |
| Requesting modifications to the Spectre Rig Gearbox. | 19th Aug 1935 | Box 94 \ 1 scan0170 | |
| Request to fit Scheme I of G. 83203 for a gearbox silence test on a Spectre I car. | 19th Aug 1935 | Box 94 \ 1 scan0171 | |
| Proposing a modification to the Spectre gearbox by increasing the synchromesh cam angle. | 20th Aug 1935 | Box 94 \ 1 scan0172 | |
| Secret memo regarding modifications to the Spectre Gearbox for improved oil distribution and lubrication. | 21th Aug 1935 | Box 94 \ 1 scan0173 | |
| Modifications to the Spectre gearbox synchromesh and mounting. | 22th Aug 1935 | Box 94 \ 1 scan0174 | |
| Secret memorandum regarding an updated synchromesh cam for the Spectre Gearbox. | 23th Aug 1935 | Box 94 \ 1 scan0175 | |
| Incorrectly positioned drain hole on the Spectre II gearbox and the required modification. | 26th Aug 1935 | Box 94 \ 1 scan0176 | |
| List of modifications to be made to the Spectre Rig Gearbox. | 26th Aug 1935 | Box 94 \ 1 scan0177 | |
| Oil drainage solutions for the Spectre Gearbox. | 28th Aug 1935 | Box 94 \ 1 scan0178 | |
| Designs for temporary supports and suspension for the Spectre Gearbox. | 2nd Sep 1935 | Box 94 \ 1 scan0179 | |
| Requesting an increase to the synchromesh angles for the Spectre Gearbox. | 2nd Sep 1935 | Box 94 \ 1 scan0180 | |
| Experiment on a temporary suspension for the Spectre Gearbox to improve silence. | 3rd Sep 1935 | Box 94 \ 1 scan0181 | |
| Potential improvements to the Spectre Gearbox by testing a new isolated change-speed mechanism. | 3rd Sep 1935 | Box 94 \ 1 scan0182 | |
| Temporary single point mounting for the Spectre Gearbox. | 4th Sep 1935 | Box 94 \ 1 scan0183 | |
| Requesting trials for a set of higher 1st speed gears for the Spectre Gearbox. | 5th Sep 1935 | Box 94 \ 1 scan0184 | |
| Secret memo regarding a temporary single point mounting for the Spectre Gearbox. | 6th Sep 1935 | Box 94 \ 1 scan0185 | |
| Incorrect second-speed synchromesh plunger springs fitted to production gearboxes and a request to fit the correct parts. | 12th Sep 1935 | Box 94 \ 1 scan0186 | |
| Required alterations to the gearbox of a Spectre 2-S-1 vehicle to reduce noise. | 12th Sep 1935 | Box 94 \ 1 scan0187 | |
| Confirming the requirement for a second set of Cadillac gears for the Spectre project. | 12th Sep 1935 | Box 94 \ 1 scan0188 | |
| Spectre Gearbox transmission knocks, proposing a reduction in gear and keyway clearances. | 13th Sep 1935 | Box 94 \ 1 scan0189 | |
| Need for intensive testing on the bearings of the Spectre Gearbox due to the use of 45° angle coarse gears. | 14th Sep 1935 | Box 94 \ 1 scan0190 | |
| Listing 14 specific modifications required for a spare 'Spectre' gearbox. | 17th Sep 1935 | Box 94 \ 1 scan0191 | |
| List of notes on modifications for gear lever centralising springs and servo components. | 17th Sep 1935 | Box 94 \ 1 scan0192 | |
| Clarifying a misunderstanding between departments regarding the correct spring part number for gearboxes. | 17th Sep 1935 | Box 94 \ 1 scan0193 | |
| Confirmation of instructions to modify the Phantom III side levers, specifically shortening the hand brake lever knob and adjusting the gear lever position. | 17th Sep 1935 | Box 94 \ 1 scan0194 | |
| Secret memo detailing modifications to the Phantom III gear lever for improved driver leg clearance. | 18th Sep 1935 | Box 94 \ 1 scan0195 | |
| Request to measure the load required to move the S.M. sleeves on a Spectre III gearbox during dismantling. | 18th Sep 1935 | Box 94 \ 1 scan0196 | |
| Progress report on W. Bell's work, detailing delays in testing the Spectre gearbox. | 19th Sep 1935 | Box 94 \ 1 scan0197 | |
| Investigation into a 'chunking' issue with a Spectre Gearbox by dismantling and measuring for wear. | 20th Sep 1935 | Box 94 \ 1 scan0198 | |
| Experimental rear crossmember for the Phantom III gearbox to damp vibrations. | 25th Sep 1935 | Box 94 \ 1 scan0199 | |
| Failed gearbox stay on the Phantom III and its replacement. | 25th Sep 1935 | Box 94 \ 1 scan0200 | |
| Improving gear silence in the Spectre gearbox by acquiring new research and testing equipment. | 1st Oct 1935 | Box 94 \ 1 scan0201 | |
| Investigation into gearbox noise amplification on the Phantom III and proposed experiments to solve it. | 2nd Oct 1935 | Box 94 \ 1 scan0202 | |
| Proposed experiments and investigations into gearbox mounting and frame rigidity. | 2nd Oct 1935 | Box 94 \ 1 scan0203 | |
| Instructions for modifications to the gearbox for Spectre 1-S-1. | 7th Oct 1935 | Box 94 \ 1 scan0204 | |
| Instruction regarding the use of wide synchromesh cones for the Phantom III gearbox. | 1st Oct 1935 | Box 94 \ 1 scan0205 | |
| 'chunking in the drive' issue on a Spectre, proposing tests with modified propeller shafts. | 10th Oct 1935 | Box 94 \ 1 scan0206 | |
| Gear face coefficient of friction tests to determine required end load on gearbox shafts. | 10th Oct 1935 | Box 94 \ 1 scan0207 | |
| Test report on washer surface torque and coefficient of friction under various conditions. | 10th Oct 1935 | Box 94 \ 1 scan0208 | |
| Typed document discussing the initial and final torque required for movement and the lubricant used. | 10th Oct 1935 | Box 94 \ 1 scan0209 | |
| 'chunking' issue in the drive for the 'Spectre' model, proposing a heavier flywheel. | 10th Oct 1935 | Box 94 \ 1 scan0210 | |
| Drawing of a Spectre Flywheel with increased inertia. | 10th Oct 1936 | Box 94 \ 1 scan0211 | |
| Request to detail pieces for a dash pot under scheme Hs.2187 to address 'Chunking in Drive' on the Phantom III. | 10th Oct 1935 | Box 94 \ 1 scan0212 | |
| The examination and modification of a Spectre Rig Gearbox following a seizure test. | 11th Oct 1935 | Box 94 \ 1 scan0213 | |
| Requesting a modification to the Spectre Rig Gearbox for oil feeding. | 17th Oct 1935 | Box 94 \ 1 scan0214 | |
| Design changes to the Phantom III Gearbox Synchromesh Pieces. | 17th Oct 1935 | Box 94 \ 1 scan0215 | |
| Experiment for gear bush lubrication in the Phantom III Gearbox. | 17th Oct 1935 | Box 94 \ 1 scan0216 | |
| List of tests carried out to resolve drive to overrun transmission chunking noise. | 18th Oct 1935 | Box 94 \ 1 scan0217 | |
| Test report detailing modifications and results for gear performance on various vehicles. | 18th Oct 1935 | Box 94 \ 1 scan0218 | |
| Test report detailing issues with clutch splines, axle backlash, and gearbox slack on car model 30-EX. | 18th Oct 1935 | Box 94 \ 1 scan0219 | |
| Modified fixing for the 3rd speed cone in the Phantom III gearbox. | 28th Oct 1935 | Box 94 \ 1 scan0220 | |
| Experimental modification to the Phantom III gearbox 2nd speed pieces to facilitate engagement. | 29th Oct 1935 | Box 94 \ 1 scan0221 | |
| Requesting modifications to a Ph.III Rig Gearbox to increase the oil supply. | 31th Oct 1935 | Box 94 \ 1 scan0222 | |
| Hand-drawn modification sketch showing two views of a mechanical part. | 31th Oct 1935 | Box 94 \ 1 scan0223 | |
| Experiments to resolve a 'clunking' issue in the Phantom III transmission. | 2nd Nov 1936 | Box 94 \ 1 scan0224 | |
| Tabulated report of test results for modifications to gearboxes and related components on various car models. | 2nd Nov 1935 | Box 94 \ 1 scan0225 | |
| Test log sheet detailing results for various car component configurations and adjustments. | 2nd Nov 1935 | Box 94 \ 1 scan0226 | |
| Test report detailing various modifications and their resulting effects on different car models. | 2nd Nov 1935 | Box 94 \ 1 scan0227 | |
| Summary table of test modifications and their results for the 30-MX and Buick models. | 2nd Nov 1935 | Box 94 \ 1 scan0228 | |
| 'chunking' issue, requesting a modified sliding member for a Spectre I to test a solution. | 4th Nov 1935 | Box 94 \ 1 scan0229 | |
| Modifications to the Gearbox Front Suspension for the Phantom III model. | 7th Nov 1935 | Box 94 \ 1 scan0230 | |
| Experimental oil feed scoop for the 3rd speed and spigot bushes. | 8th Nov 1935 | Box 94 \ 1 scan0231 | |
| Lubrication methods for the Phantom III gearbox, comparing a gear pump with a trough and scoop system. | 12th Nov 1935 | Box 94 \ 1 scan0232 | |
| Modifications to the Phantom III gearbox concerning the taper mounting for the constant mesh pinion. | 12th Nov 1935 | Box 94 \ 1 scan0233 | |
| Modifications to the Phantom III gearbox and propeller shaft coupling. | 12th Nov 1935 | Box 94 \ 1 scan0234 | |
| Unsatisfactory gear changes in the Phantom III gearbox and outlining proposed tests on the synchromesh cones. | 13th Nov 1935 | Box 94 \ 1 scan0235 | |
| Request to investigate and fit a more flexible coupling for the Spectre gearbox to reduce chunking. | 14th Nov 1935 | Box 94 \ 1 scan0236 | |
| Request regarding a new torsional coupling to address a 'Chunking' issue on the Spectre model. | 18th Nov 1935 | Box 94 \ 1 scan0237 | |
| Instruction to modify the oil feed scoop on the Phantom III Rig Gearbox to reduce oil supply. | 22th Nov 1935 | Box 94 \ 1 scan0238 | |
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