| Description | Date | Identifier | |
| Trouble with the Phantom III gearbox rear nut locking mechanism. | 3rd Aug 1937 | Box 94 \ 2 scan0267 | |
| Instruction memo to the Fitting Shop regarding the inspection of a gearbox and testing of a rear axle. | 3rd Aug 1937 | Box 94 \ 2 scan0268 | |
| Loose Gearbox-Engine Stay on a 32-EX Phantom III. | 4th Aug 1937 | Box 94 \ 2 scan0269 | |
| Letter to Ransome & Marles Bearing Co. regarding the progress of an order for gearbox bearings and axle rig testing. | 5th Aug 1937 | Box 94 \ 2 scan0270 | |
| Instruction to bring the over-drive gearbox into production for the Phantom III chassis from the 101st 'D' series chassis. | 5th Aug 1937 | Box 94 \ 2 scan0271 | |
| Looseness and movement of a gearbox-engine stay on a Phantom III. | 9th Aug 1937 | Box 94 \ 2 scan0272 | |
| Cover memo for a report on Phantom III gears produced by The Fellows Gear Shaper Co. of America. | 10th Aug 1937 | Box 94 \ 2 scan0273 | |
| Test report on a gearbox with American-produced gears (PH.111), detailing noise issues and potential improvements. | 9th Aug 1937 | Box 94 \ 2 scan0274 | |
| Analysis of gear eccentricity, spacing error, and tooth form performance. | 9th Aug 1937 | Box 94 \ 2 scan0275 | |
| Production methods and heat treatment for manufacturing gear blanks. | 9th Aug 1937 | Box 94 \ 2 scan0276 | |
| Heat treatment and hardness testing process for a gear component. | 9th Aug 1937 | Box 94 \ 2 scan0277 | |
| Loose gearbox drain plug on a Phantom III vehicle. | 17th Aug 1937 | Box 94 \ 2 scan0278 | |
| Standardisation of screw threaded synchromesh cones for top, third, and second speed. | 10th Jul 1937 | Box 94 \ 2 scan0279 | |
| Proposal and cost estimate for standardising the Sorbo thrust washer for the Phantom III 'E' Series. | 10th Jan 1931 | Box 94 \ 2 scan0280 | |
| Modification to a gearbox part after a preliminary test failure. | 2nd Sep 1937 | Box 94 \ 2 scan0281 | |
| Confirming a conversation to obtain two types of Hoffman bearings with steel instead of bronze cages. | 11th Sep 1937 | Box 94 \ 2 scan0282 | |
| Arranging for a bottle of oil from an experimental gearbox to be forwarded to C.C. Wakefield & Co. Ltd. | 13th Sep 1937 | Box 94 \ 2 scan0283 | |
| Rebuilding and testing of a Phase III flexible engine coupling for experimental cars. | 20th Sep 1937 | Box 94 \ 2 scan0284 | |
| Letter returning a faulty double-row gearbox bearing for reconditioning due to noise and dirt contamination. | 22th Sep 1937 | Box 94 \ 2 scan0285 | |
| Letter from Ransome & Marles Bearing Co. regarding the polishing of a double row ball bearing and tests on gear lubricant. | 24th Sep 1937 | Box 94 \ 2 scan0286 | |
| Letter from a bearing supplier detailing test results and proposing a change to bearing pre-load specifications. | 24th Sep 1937 | Box 94 \ 2 scan0287 | |
| The unsuccessful trial of a U.S.A.-made gearbox due to excessive noise. | 28th Sep 1937 | Box 94 \ 2 scan0288 | |
| Letter to Messrs Ransome & Marles Ltd. concerning an order for 6 bearings for a larger pinion bearing. | 28th Sep 1937 | Box 94 \ 2 scan0289 | |
| Official order be sent for the supply of bearings with a specific preload. | 28th Sep 1937 | Box 94 \ 2 scan0290 | |
| Stripping a gearbox to investigate the wearing properties of USA-produced gears for the Phantom III. | 1st Oct 1937 | Box 94 \ 2 scan0291 | |
| Standardisation report for a stay between the gearbox and engine on the Phantom III, designed to reduce chunking. | 31th Aug 1937 | Box 94 \ 2 scan0292 | |
| Intimation of a modification to the stay between the gearbox and engine to reduce machining costs. | 11th Oct 1926 | Box 94 \ 2 scan0293 | |
| Advice note from Ransome & Marles Bearing Co. Ltd for the dispatch of a double purpose bearing. | 19th Oct 1937 | Box 94 \ 2 scan0294 | |
| Confirmation memo to fit No. 17 overdrive box into chassis 37-EX. | 21th Oct 1937 | Box 94 \ 2 scan0295 | |
| Letter accompanying examples of three types of bearing failures sent to Ransome & Marles Bearing Co., Ltd. | 21th Oct 1937 | Box 94 \ 2 scan0296 | |
| The test results for the PH.III flexible engine coupling and its performance benefits. | 21th Oct 1937 | Box 94 \ 2 scan0297 | |
| The introduction of the Overdrive Gearbox for the Phantom 111, detailing testing and scrap costs. | 25th Oct 1937 | Box 94 \ 2 scan0298 | |
| Introduction and cost implications of the Overdrive Gearbox for the Phantom III chassis. | 25th Oct 1937 | Box 94 \ 2 scan0299 | |
| Confirming the overdrive gearbox on Phantom III experimental cars is fouling the body cross member. | 16th Nov 1937 | Box 94 \ 2 scan0300 | |
| Standardisation report on replacing baffle washers on the servo drive shaft with plain washers. | 18th Oct 1937 | Box 94 \ 2 scan0301 | |
| Note confirming nil extra tool cost for a change to be introduced on the 101st Chassis in the 'D' series. | 18th Oct 1937 | Box 94 \ 2 scan0302 | |
| Alterations to gearbox arrangements for specific car models. | 10th Dec 1937 | Box 94 \ 2 scan0303 | |
| The decision to use chilled cast phosphor bronze for the bushes in the Phantom III and Bentley overdrive gearboxes. | 1st Jan 1937 | Box 94 \ 2 scan0304 | |
| Requesting an experiment on a gearbox to test for wear on 3rd speed bushes with an adequate oil supply. | 4th Jan 1938 | Box 94 \ 2 scan0305 | |
| The replacement of steel bushes in the gearbox of car 37-EX. | 6th Jan 1938 | Box 94 \ 2 scan0306 | |
| Introduction and experimental production of the Overdrive Gearbox for the Phantom III. | 10th Jan 1938 | Box 94 \ 2 scan0307 | |
| Instruction to revert to bronze bushes on PH.III overdrive gearboxes. | 13th Jan 1937 | Box 94 \ 2 scan0308 | |
| Letter to Messrs. Ransome & Marles regarding issues with audible roughness in bearings for the Phantom gearbox. | 19th Jan 1938 | Box 94 \ 2 scan0309 | |
| Letter from Ransome & Marles Bearing Co. regarding gearbox bearings and other matters. | 25th Jan 1938 | Box 94 \ 2 scan0310 | |
| Letter from Ransome & Marles Bearing Co. to S.H. Grylls regarding inflation. | 25th Jan 1938 | Box 94 \ 2 scan0311 | |
| Visit from Mr. Pilkington, Chief Engineer of Leylands, discussing synchromesh gearboxes, fuel pumps, oil engines, and brakes. | 25th Jan 1938 | Box 94 \ 2 scan0312 | |
| Reconditioning of four ball bearings for a Phantom III gearbox. | 2nd Mar 1938 | Box 94 \ 2 scan0313 | |
| Letter from Ransome & Marles Bearing Co. Ltd. regarding the dispatch of four serviced bearings. | 8th Mar 1938 | Box 94 \ 2 scan0314 | |
| Advice note from Ransome & Marles Bearing Co. Ltd regarding bearings returned after cleaning and polishing. | 8th Mar 1938 | Box 94 \ 2 scan0315 | |
| Parts list for the Phantom III automatic clutch brake, gearbox, and engine coupling. | 16th Mar 1938 | Box 94 \ 2 scan0316 | |
| Parts list with quantities for an experiment, issued on verbal instructions. | 16th Mar 1938 | Box 94 \ 2 scan0317 | |
| Comments on complaints received during the assembly of the first production Overdrive Gearbox for the Phantom III. | 11th May 1938 | Box 94 \ 2 scan0318 | |
| Complaints, reasons, and explanations for gearbox component issues. | 11th May 1938 | Box 94 \ 2 scan0319 | |
| Complaint report regarding a Phantom III gearbox, discussing crashing teeth and incorrectly machined or sized cones. | 16th May 1938 | Box 94 \ 2 scan0320 | |
| Production hold-up on the Phantom III chassis, requiring a redesign of the gearbox undershield for models with Overdrive. | 31th May 1938 | Box 94 \ 2 scan0321 | |
| Oversight by the Drawing Office regarding space requirements for the Phantom III overdrive box undershield. | 2nd Jun 1938 | Box 94 \ 2 scan0322 | |
| Unfinished experimental design for a vacuum gear shift device on the Phantom III chassis. | 6th Oct 1938 | Box 94 \ 2 scan0323 | |
| Unfinished experimental design for mounting an Evans Vacuum Gear Shift device on the Phantom 111 chassis. | 6th Oct 1938 | Box 94 \ 2 scan0324 | |
| Requesting the purchase of two cup leathers for an experimental air cylinder. | 4th Jan 1939 | Box 94 \ 2 scan0325 | |
| Modification of a vacuum gear change cylinder for the 35.EX model to reduce noisy operation. | 4th Jan 1939 | Box 94 \ 2 scan0326 | |
| Drawing of a liner to reduce the bore of a vacuum gear change cylinder. | 4th Nov 1939 | Box 94 \ 2 scan0327 | |
| Confirmation request for cooling tests to be conducted on the Vulture radiator. | 28th May 1934 | Box 94 \ 3 scan0001 | |
| The flexible centre mounting for the Spectre's radiator and wing assembly. | 5th Jun 1934 | Box 94 \ 3 scan0002 | |
| Modifications and development work on the Spectre bonnet and radiator. | 13th Sep 1934 | Box 94 \ 3 scan0003 | |
| Blueprint for the 'Spectre' model radiator mascot, featuring the 'Kneeling Lady' design. | 14th Sep 1934 | Box 94 \ 3 scan0004 | |
| Attached sketch of the Spectre radiator with a forward-swept grille. | 13th Sep 1934 | Box 94 \ 3 scan0005 | |
| Alteration to the Spectre radiator matrix detail drawing E.85830. | 9th Oct 1934 | Box 94 \ 3 scan0006 | |
| Table of revised weights and specifications for various radiator matrices. | 25th Mar 1935 | Box 94 \ 3 scan0007 | |
| Table of revised matrix weights for various car models and types. | 16th Apr 1935 | Box 94 \ 3 scan0008 | |
| Redesign of the Spectre radiator and seeking views on the shell material. | 13th May 1935 | Box 94 \ 3 scan0009 | |
| Proposed improvements to the Spectre Radiator, including thermostatically operated shutters, an anti-spill valve, and a vacuum prevention valve. | 13th May 1935 | Box 94 \ 3 scan0010 | |
| Secret memo detailing design changes for the Spectre radiator, including associated drawing numbers. | 17th Jun 1935 | Box 94 \ 3 scan0011 | |
| Secret memo regarding drawing LeC.4567 showing the top water pipes for the Spectre project. | 21th Jun 1935 | Box 94 \ 3 scan0012 | |
| Spectre radiator and development of the Large Bore 20/25 engine. | 24th Jul 1935 | Box 94 \ 3 scan0013 | |
| Rattling issue with radiator shutters on Spectre & 20/25 models and a proposal to test a spring-loaded design. | 16th Aug 1935 | Box 94 \ 3 scan0014 | |
| Modified stop for the Spectre radiator shell bolts to prevent bending. | 20th Aug 1935 | Box 94 \ 3 scan0015 | |
| Letter to John Marston Ltd. regarding an order for a radiator matrix and discussing radiator tests. | 3rd Sep 1935 | Box 94 \ 3 scan0016 | |
| Request to order one Mark VI Radiator Matrix from Messrs. John Marston, referencing drawing E.87003. | 3rd Sep 1935 | Box 94 \ 3 scan0017 | |
| Malfunctioning steam valve on the Phantom III radiator, referencing a modified design. | 18th Sep 1935 | Box 94 \ 3 scan0018 | |
| Testing and modification of a diaphragm for the Spectre II radiator pressure release valve. | 18th Sep 1935 | Box 94 \ 3 scan0019 | |
| Modifications and new drawings for the Spectre Chassis radiator and fittings, specifically the steam valve. | 24th Sep 1935 | Box 94 \ 3 scan0020 | |
| Alteration notice for a steam chamber, changing the internal bore angle. | 24th Sep 1935 | Box 94 \ 3 scan0021 | |
| Anti-splash baffles for the Phantom III radiator top fork to prevent leakage. | 9th Oct 1935 | Box 94 \ 3 scan0022 | |
| Challenges with the Spectre model's cooling system, including pump, radiator, and fan limitations. | 15th Oct 1935 | Box 94 \ 3 scan0023 | |
| To RHC regarding the redesign of the Phantom III radiator steam valves, proposing a new scheme using parts from a 'Camel' type valve. | 15th Nov 1935 | Box 94 \ 3 scan0024 | |
| Testing baffles in a Ph.III radiator top tank to reduce water loss and proposing a new scheme. | 19th Nov 1935 | Box 94 \ 3 scan0025 | |
| Mock-up for a Phantom III radiator grille, with vertical slats similar to a Packard, for appearance and airflow testing. | 27th Nov 1935 | Box 94 \ 3 scan0026 | |
| Modifications to the Spectre III radiator steam release diaphragm and nozzles. | 12th Dec 1935 | Box 94 \ 3 scan0027 | |
| Request for a 'Camel' type diaphragm for the Phantom III Radiator Steam valves. | 12th Dec 1935 | Box 94 \ 3 scan0028 | |
| The addition of spreader pipes to the Phantom III radiator top tank. | 17th Dec 1935 | Box 94 \ 3 scan0029 | |
| Instructions to test new schemes for preventing water loss on Phantom III radiators. | 18th Dec 1935 | Box 94 \ 3 scan0030 | |
| Leakages in Ph.III Radiator Steam valve diaphragms and requesting a new build. | 31th Dec 1935 | Box 94 \ 3 scan0031 | |
| Use and testing of enamel paint for a radiator matrix. | 4th Jan 1936 | Box 94 \ 3 scan0032 | |
| Sample of Matt Black Cellulose Enamel for use on radiator matrices. | 23th Dec 1935 | Box 94 \ 3 scan0033 | |
| Two experimental schemes for improving a Phantom III steam valve. | 1st Jan 1936 | Box 94 \ 3 scan0034 | |
| The No.3 design for a Phantom III Radiator Steam Valve. | 23th Jan 1936 | Box 94 \ 3 scan0035 | |
| Requesting an order for a bellows assembly for an experiment on a Phantom III steam valve radiator. | 3rd Feb 1936 | Box 94 \ 3 scan0036 | |
| Laboratory report on the analysis of a deposit from a Phantom lll Radiator. | 15th Feb 1936 | Box 94 \ 3 scan0037 | |
| Suitability, manufacturing, and failings of a steam valve for Phantom III production. | 21th Feb 1936 | Box 94 \ 3 scan0038 | |
| Proposing a rig test to solve persistent water loss issues from Phantom III radiators. | 24th Feb 1936 | Box 94 \ 3 scan0039 | |
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