| Description | Date | Identifier | |
| Requesting measurements of slacks in a 35-EX gearbox before and after rebuilding. | 23th Nov 1935 | Box 94 \ 1 scan0239 | |
| Oversight in the instruction for Phantom III gearbox selector rod springs. | 25th Nov 1935 | Box 94 \ 1 scan0240 | |
| Instructing the use of selector rod springs G.82221 for all future and existing Phantom III gearboxes. | 29th Nov 1935 | Box 94 \ 1 scan0241 | |
| Requesting preparation of narrow synchromesh cone pieces for the Phantom III Gearbox. | 2nd Dec 1935 | Box 94 \ 1 scan0242 | |
| Modifications for the improved actuation of the reverse catch on the gear lever for all cars. | 2nd Dec 1935 | Box 94 \ 1 scan0243 | |
| Experiments and modifications for the Phantom III Gearbox scoop. | 4th Dec 1935 | Box 94 \ 1 scan0244 | |
| The design for an isolated gear lever for the Phantom III. | 4th Dec 1935 | Box 94 \ 1 scan0245 | |
| Modifications to the gearbox, gear lever, reverse catch, and hand brake lever. | 4th Dec 1935 | Box 94 \ 1 scan0246 | |
| Potential modifications for the Phantom III production gearbox, specifically regarding cones and screw threads. | 4th Dec 1935 | Box 94 \ 1 scan0247 | |
| Letter from Thomson & Taylor regarding transmission backlash noise, referencing information from Hudson. | 5th Dec 1935 | Box 94 \ 1 scan0248 | |
| Letter from the Experimental Department regarding a 12-cylinder car and chassis availability. | 6th Dec 1935 | Box 94 \ 1 scan0249 | |
| Investigating and solving 'chunking in the drive' by using a dashpot in the carburetter. | 6th Dec 1935 | Box 94 \ 1 scan0250 | |
| Short internal memo suggesting a new gearbox for a car. | 6th Dec 1935 | Box 94 \ 1 scan0251 | |
| Requesting the nickel plating of cones and fitting of narrow cones to a Phantom III gearbox from car 33-EX. | 7th Dec 1935 | Box 94 \ 1 scan0252 | |
| Modifications and parts for a Phantom III gearbox, with a handwritten response. | 7th Dec 1935 | Box 94 \ 1 scan0253 | |
| Status report and allocation list for Spectre model gearboxes. | 9th Dec 1935 | Box 94 \ 1 scan0254 | |
| Handover of the Spectre I car for gearbox work and the dismantling of car 31-EX. | 9th Dec 1935 | Box 94 \ 1 scan0255 | |
| Letter from The Harboro' Rubber Co. Ltd regarding rubber buffer samples and durometer readings. | 10th Dec 1935 | Box 94 \ 1 scan0256 | |
| Experimental designs and issues with the Phantom III rear gearbox mounting. | 14th Dec 1935 | Box 94 \ 1 scan0257 | |
| The specifications for a rubber component to handle specific loads. | 14th Dec 1935 | Box 94 \ 1 scan0258 | |
| Requesting production of rubber washers and rings due to incorrect hardness of samples from Harboro Rubber Co. | 17th Dec 1935 | Box 94 \ 1 scan0259 | |
| Reverting to the original rear gearbox rubber mounting for the Phantom III after a newer design failed. | 17th Dec 1935 | Box 94 \ 1 scan0260 | |
| 'chunking' issue in Phantom III gearboxes, highlighting the importance of tight sliding pieces. | 13th Dec 1935 | Box 94 \ 1 scan0261 | |
| Oil feeding scoop for the 3rd speed and spigot bushes of a Ph.III Gearbox. | 11th Dec 1935 | Box 94 \ 1 scan0262 | |
| Tests of an oil scoop for the Ph.III Gearbox. | 13th Dec 1935 | Box 94 \ 1 scan0263 | |
| Conclusion from tests on oil delivery arrangements, identifying arrangement No.2 as the most satisfactory for production. | 13th Dec 1935 | Box 94 \ 1 scan0264 | |
| Blueprint showing modifications to an oil scoop for a PH.III Gearbox. | 13th Dec 1935 | Box 94 \ 1 scan0265 | |
| Test results for a Spectre Gear Box oil feed to the third motion shaft, run in fourth gear. | 29th Oct 1935 | Box 94 \ 1 scan0266 | |
| Test data sheet for the oil feed to the 3rd motion shaft of an I.H.S. Spectre gearbox. | 18th Nov 1935 | Box 94 \ 1 scan0267 | |
| Test results for the Spectre Gear-Box oil feed to the 3rd motion shaft in 4th speed. | 3rd Dec 1935 | Box 94 \ 1 scan0268 | |
| Test report on the Spectre Gearbox oil feed to the 3rd motion shaft, detailing modifications and results using high pressure heavy oil. | 13th Dec 1935 | Box 94 \ 1 scan0269 | |
| Gearbox tests comparing results from horizontal test conditions to expected road conditions. | 13th Dec 1935 | Box 94 \ 1 scan0270 | |
| Graph plotting oil ejected versus oil temperature at various RPMs for a Spectre gear box 3rd motion shaft lubrication test. | 18th Nov 1935 | Box 94 \ 1 scan0271 | |
| Request to manufacture a set of cones for a Ph.III gearbox with four specific design instructions. | 18th Dec 1935 | Box 94 \ 1 scan0272 | |
| Modifications to the Synchromesh Cones for the Phantom III Gearbox. | 18th Dec 1935 | Box 94 \ 1 scan0273 | |
| The fitment of a final lubrication scoop scheme to a Phantom III Rig Gearbox. | 19th Dec 1935 | Box 94 \ 1 scan0274 | |
| Alternative schemes and standardisation for Phantom III Gearbox Mountings. | 19th Dec 1935 | Box 94 \ 1 scan0275 | |
| Testing and selection of a rear gearbox mounting for the Phantom III. | 19th Dec 1935 | Box 94 \ 1 scan0276 | |
| Letter to T.B. Andre & Co. Ltd. regarding issues with a rubber ring part contracting after moulding. | 21th Dec 1935 | Box 94 \ 1 scan0277 | |
| Phantom III Gearbox and urging the progression of the N.Sch.4661 9° cone scheme experiment. | 23th Dec 1935 | Box 94 \ 1 scan0278 | |
| Dispatch note detailing parts being sent to the Harboro' Rubber Co. Ltd. for modification. | 23th Dec 1935 | Box 94 \ 1 scan0279 | |
| Request to issue a purchase order for rubber parts to the Harboro' Rubber Co. Ltd. | 23th Dec 1935 | Box 94 \ 1 scan0280 | |
| Letter to The Harboro' Rubber Co. Ltd. regarding the production of rubber parts using supplied steel components. | 23th Dec 1935 | Box 94 \ 1 scan0281 | |
| Letter from The Harboro' Rubber Co. Ltd regarding the supply of rubber blocks and metal inserts. | 27th Dec 1935 | Box 94 \ 1 scan0282 | |
| Modification to Phantom III gearbox diaphragm retaining bolts to prevent cracking. | 30th Dec 1935 | Box 94 \ 1 scan0283 | |
| Solution for 'chunking' in Ph.III gearboxes by improving the fit of sliding pieces. | 30th Dec 1935 | Box 94 \ 1 scan0284 | |
| Letter from Silentbloc Limited regarding the assembly of a part as per print N.Sch.4531 and the submission of a sample. | 1st Jan 1936 | Box 94 \ 1 scan0285 | |
| Dispatch of Phantom III rear gearbox parts for rubber mounting fitting. | 2nd Jan 1936 | Box 94 \ 1 scan0286 | |
| Despatch of rubber gearbox suspension units to Silent Bloc Ltd for refitting. | 4th Jan 1936 | Box 94 \ 1 scan0287 | |
| Request to send a covering order to Silentbloc Ltd. for rubber parts. | 4th Jan 1936 | Box 94 \ 1 scan0288 | |
| Letter to Silent Bloc Ltd. regarding the properties and testing of rubber parts for vibration reduction. | 4th Jan 1936 | Box 94 \ 1 scan0289 | |
| Instruction to rebuild a gearbox from car 33.EX.-2HS with the crowned Cone scheme. | 6th Jan 1936 | Box 94 \ 1 scan0290 | |
| Specifying the requirements for rebuilding a Ph.III gearbox, No. 4-HS, taken from car 31-EX. | 7th Jan 1936 | Box 94 \ 1 scan0291 | |
| Recommendation to remove the oil drain pipes for the servo bearings on the Ph.III gearbox for production models. | 8th Jan 1936 | Box 94 \ 1 scan0292 | |
| Investigation into the causes and proposed solutions for erratic synchromesh working in the Phantom III Gearbox. | 8th Jan 1936 | Box 94 \ 1 scan0293 | |
| Gearbox design improvements, comparing Vulture and Phantom III synchromesh cones. | 8th Jan 1936 | Box 94 \ 1 scan0294 | |
| Requesting the reproduction of modified Vulture type bronze and steel cones for the Phantom gearbox. | 8th Jan 1936 | Box 94 \ 1 scan0295 | |
| Technical memorandum discussing the design and testing of the Phantom III rear gearbox mounting. | 14th Dec 1935 | Box 94 \ 1 scan0296 | |
| The specifications for a rubber component's length, area, and volume for load-bearing purposes. | 14th Dec 1935 | Box 94 \ 1 scan0297 | |
| Modifications to strengthen the 3rd speed driven gear for the Phantom III gearbox. | 13th Jan 1936 | Box 94 \ 1 scan0298 | |
| Modifications to the Phantom III gearbox's 3rd speed driven gear to strengthen it. | 13th Jan 1936 | Box 94 \ 1 scan0299 | |
| Letter from Silentbloc Limited discussing two bearing suggestions, 'A' and 'B', in response to a drawing. | 13th Jan 1936 | Box 94 \ 1 scan0300 | |
| Blueprint showing two suggestions for a gearbox mounting rear support. | 10th Jan 1936 | Box 94 \ 1 scan0301 | |
| Letter to Silentbloc Ltd. discussing rubber component designs, requesting samples and a cost per unit. | 14th Jan 1936 | Box 94 \ 1 scan0302 | |
| Gearbox jumping out of 2nd gear on chassis 33-EX and requesting a modification. | 14th Jan 1936 | Box 94 \ 1 scan0303 | |
| Payment authorisation for an invoice from the British Tyre & Rubber Co., Ltd. | 15th Jan 1936 | Box 94 \ 1 scan0304 | |
| Modification to the Phantom III gearbox's second speed sliding shaft due to a stiff spring ring. | 16th Jan 1936 | Box 94 \ 1 scan0305 | |
| Letter from Silentbloc Limited discussing deflection test results for their bearings versus a customer's mounting. | 16th Jan 1936 | Box 94 \ 1 scan0306 | |
| Production and specification of coarse pitch gears for the Phantom III chassis gearbox. | 17th Jan 1936 | Box 94 \ 1 scan0307 | |
| Production testing of coarse pitch gears for the Phantom III. | 20th Jan 1936 | Box 94 \ 1 scan0308 | |
| Letter from Silentbloc Limited confirming a meeting with Mr. Leslie to discuss Silentbloc Mountings. | 21th Jan 1936 | Box 94 \ 1 scan0309 | |
| Issues with gearbox No. 3-HS and instructions for its repair. | 22th Jan 1936 | Box 94 \ 1 scan0310 | |
| Request to issue an order to cover rubber buffers received from the British Tyre & Rubber Co., Ltd. | 23th Jan 1936 | Box 94 \ 1 scan0311 | |
| The fitting of a first sample rubber for the Rear Gearbox Mounting on car 32-EX. | 23th Jan 1936 | Box 94 \ 1 scan0312 | |
| Requesting the manufacture of two steel and two bronze cones and reporting issues with a previous design. | 28th Jan 1936 | Box 94 \ 1 scan0313 | |
| Modifications to the Phantom III brake rods and gearbox suspension to resolve a fouling issue. | 28th Jan 1936 | Box 94 \ 1 scan0314 | |
| Proposed modifications to the brake rods and gearbox suspension for the Phantom III to resolve a fouling issue. | 28th Jan 1936 | Box 94 \ 1 scan0315 | |
| Invoice received from The Harboro Rubber Co. Ltd. for rubber blocks that the Stores Department has no record of receiving. | 28th Jan 1936 | Box 94 \ 1 scan0316 | |
| The Phantom III rear gearbox mounting. | 1st Feb 1936 | Box 94 \ 1 scan0317 | |
| Letter to Silentbloc Ltd. concerning the testing of a sample rubber mounting and requesting further units. | 1st Feb 1936 | Box 94 \ 1 scan0318 | |
| To book in 4 rubbers received from The Harboro Rubber Co. Ltd. | 1st Feb 1936 | Box 94 \ 1 scan0319 | |
| Order be issued for 6 Silentbloc gearbox units. | 1st Feb 1936 | Box 94 \ 1 scan0320 | |
| Dispatch request to send one rear rubber gearbox mounting to Messrs Silentbloc Ltd. for inspection. | 1st Feb 1936 | Box 94 \ 1 scan0321 | |
| Letter from Silentbloc Limited discussing load deflection test results and materials for sample mountings. | 3rd Feb 1936 | Box 94 \ 1 scan0322 | |
| Letter to Messrs. Silentbloc Ltd. regarding the material for inner sleeves of gearbox mountings. | 4th Feb 1936 | Box 94 \ 1 scan0323 | |
| To RHC about testing various bronze and hardened cones for the Phantom III Gearbox. | 4th Feb 1936 | Box 94 \ 1 scan0324 | |
| Letter from Silentbloc detailing test results for a sample mounting, showing load vs. deflection. | 6th Feb 1936 | Box 94 \ 1 scan0325 | |
| Test report on a Phantom III gearbox (HS8), focusing on the performance and bedding-in of fine thread synchromesh cones. | 7th Feb 1936 | Box 94 \ 1 scan0326 | |
| Dynamometer testing of a Phantom III gearbox with Cadillac type gears. | 11th Feb 1936 | Box 94 \ 1 scan0327 | |
| Modification to the Phantom III Gearbox Silentbloc Rear Support. | 12th Feb 1936 | Box 94 \ 1 scan0328 | |
| Modification to the Phantom III gearbox Silentbloc rear support, required for immediate production. | 12th Feb 1936 | Box 94 \ 1 scan0329 | |
| The strengthening of synchromesh cones for the Phantom III gearbox. | 12th Feb 1936 | Box 94 \ 1 scan0330 | |
| The strengthening of synchromesh cones for the Phantom III gearbox. | 12th Feb 1936 | Box 94 \ 1 scan0331 | |
| Letter to Silentbloc Ltd. requesting detailed drawings for a rubber component to be put into production. | 13th Feb 1936 | Box 94 \ 1 scan0332 | |
| Cost reduction suggestions for the Phantom III isolated gear lever, proposing material changes for shafts and bearing cages. | 14th Feb 1936 | Box 94 \ 1 scan0333 | |
| Suggesting cost-saving changes for the Phantom III isolated gear lever by using different materials. | 14th Feb 1936 | Box 94 \ 1 scan0334 | |
| Modifications to the Phantom III isolated gear lever. | 14th Feb 1936 | Box 94 \ 1 scan0335 | |
| Modifications to the Phantom III isolated gear lever, including a stop for the ball cage and changes to the lever shaft bore. | 14th Feb 1936 | Box 94 \ 1 scan0336 | |
| Test report on a Phantom III HSG Gearbox after road testing and alterations. | 19th Feb 1936 | Box 94 \ 1 scan0337 | |
| Road test results for a Phantom III HS5 Gearbox after approximately 500 changes. | 19th Feb 1936 | Box 94 \ 1 scan0338 | |
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