| Description | Date | Identifier | |
| Alterations to the Phantom III Gearbox components, specifically the actuating sleeves and reverse rocking shaft bearing. | 28th Jan 1937 | Box 94 \ 2 scan0167 | |
| Dynamometer testing of a gearbox with Cadillac gears, focusing on heat generation and temperature limits. | 6th Feb 1937 | Box 94 \ 2 scan0168 | |
| Graph plotting P3 gearbox temperatures over time, comparing Cadillac gears with R.R. gears at full throttle. | 11th Feb 1937 | Box 94 \ 2 scan0169 | |
| Requesting a confirmatory test on the silence of an overdrive gearbox for car 37-EX. | 11th Feb 1937 | Box 94 \ 2 scan0170 | |
| Recommending the use of unlapped synchromesh cones for Phantom III gearboxes to save fitting time. | 11th Feb 1937 | Box 94 \ 2 scan0171 | |
| Performance of an experimental Phantom III Overdrive Gearbox and proposed design modifications. | 11th Feb 1937 | Box 94 \ 2 scan0172 | |
| Blueprint detailing the specifications, gear layout, and ratios for the P3 Overdrive gearbox. | 11th Feb 1937 | Box 94 \ 2 scan0173 | |
| Proposal to change the cutting method for radial slots in the helical wheels of the Phantom III gearbox. | 11th Feb 1937 | Box 94 \ 2 scan0174 | |
| Recommendations for producing slightly convex synchro mesh cones. | 15th Feb 1937 | Box 94 \ 2 scan0175 | |
| Investigation into slack on indirect gears for Phantom III gearboxes. | 9th Feb 1937 | Box 94 \ 2 scan0176 | |
| Note detailing the fitting of a set of soft gears into a gearbox, listing the part numbers. | 7th Jan 1937 | Box 94 \ 2 scan0177 | |
| Proposal to change the material for P.3 gearbox gears to reduce scrap and assembly time. | 16th Feb 1937 | Box 94 \ 2 scan0178 | |
| Proposal to change materials for Phantom III Gear Box Gears to achieve cost savings. | 16th Feb 1937 | Box 94 \ 2 scan0179 | |
| Proposed cost-saving modifications to the Phantom III gearbox, including the deletion of a lubricating scoop. | 19th Feb 1937 | Box 94 \ 2 scan0180 | |
| Despatch of gearbox and timing gears to Ford Motor Co. for hardening treatment. | 23th Feb 1937 | Box 94 \ 2 scan0181 | |
| Depot sheet concerning the rectification of drive groans in the Phantom III drive gearbox by fitting a propeller shaft damper. | 3rd Mar 1937 | Box 94 \ 2 scan0182 | |
| Specification memorandum for the Phantom III Over-drive Gearbox. | 3rd Mar 1937 | Box 94 \ 2 scan0183 | |
| Letter from a bearing manufacturer concerning issues with Bentley Pinion Bearings. | 9th Mar 1937 | Box 94 \ 2 scan0184 | |
| Letter regarding a gearbox job, enclosing sketches of two alternative schemes for consideration. | 9th Mar 1937 | Box 94 \ 2 scan0185 | |
| Hand-drawn sketches showing cross-sections of bearings or mechanical housings. | 10th Mar 1937 | Box 94 \ 2 scan0186 | |
| Modifying a Phantom III gearbox concertina and a Bentley rear axle crown wheel. | 10th Mar 1937 | Box 94 \ 2 scan0187 | |
| Dynamometer test results for a Phantom III gearbox with strengthened Cadillac gears and a Schatz bearing. | 11th Mar 1937 | Box 94 \ 2 scan0188 | |
| Letter to a bearing supplier regarding gearbox ball bearing arrangements and the supply of steering rollers. | 11th Mar 1937 | Box 94 \ 2 scan0189 | |
| The testing of a concertina coupling on a Phantom III gearbox to investigate 3rd gear disengagement issues. | 15th Mar 1937 | Box 94 \ 2 scan0190 | |
| Urgent request to order four different bearings from Ransome & Marles for a Phantom III Gearbox. | 18th Mar 1937 | Box 94 \ 2 scan0191 | |
| Request to fit cyanide-hardened Phantom III gearbox gears into Box No.4-HS, with a change to the fit of the third-speed pinion bushes. | 18th Mar 1937 | Box 94 \ 2 scan0192 | |
| Letter requesting the urgent delivery of a set of bearings to reduce gearbox slack for a car undergoing French tests. | 18th Mar 1937 | Box 94 \ 2 scan0193 | |
| Milling a flat on the engine support bracket for a Phantom III to create extra clearance. | 22th Mar 1937 | Box 94 \ 2 scan0194 | |
| Overdrive tests conducted at Brooklands race track. | 25th Mar 1937 | Box 94 \ 2 scan0195 | |
| Non-urgent modifications to the Phantom III gearbox constant mesh wheel. | 25th Mar 1937 | Box 94 \ 2 scan0196 | |
| Query regarding the design of the gear change lever centralising spring for the Phantom III Gearbox. | 2nd Apr 1937 | Box 94 \ 2 scan0197 | |
| Use of unhardened teeth on the Phantom III gearbox 1st motion shaft pinion to avoid difficulties. | 5th Apr 1937 | Box 94 \ 2 scan0198 | |
| Modification to reduce gearbox chunking by fitting a new stay between the gearbox and the engine. | 6th Apr 1937 | Box 94 \ 2 scan0199 | |
| Requesting an examination of a car's gearbox due to issues with the top gear sticking in mesh or jumping out. | 8th Apr 1937 | Box 94 \ 2 scan0200 | |
| From Rm/Gry to HPS confirming the supply of a marked-up L.O.P. for a new overdrive gearbox. | 12th Apr 1937 | Box 94 \ 2 scan0201 | |
| Improvements to the Phantom III gearbox, including comparisons to the Wraith model and potential design changes. | 13th Apr 1937 | Box 94 \ 2 scan0202 | |
| Letter to Ransome & Marles Bearing Co. Ltd. requesting an expedited delivery of four special bearings for French tests. | 15th Apr 1937 | Box 94 \ 2 scan0203 | |
| Premature wear of a gearbox engine stay on a 35-EX Phantom III after 2,000 miles. | 15th Apr 1937 | Box 94 \ 2 scan0204 | |
| Modifying the centralising spring on the Phantom III change speed mechanism. | 16th Apr 1937 | Box 94 \ 2 scan0205 | |
| On the satisfactory test results of Phantom III synchro-mesh cones. | 16th Apr 1937 | Box 94 \ 2 scan0206 | |
| The use of unlapped synchro-mesh cones in Phantom III gearboxes. | 16th Apr 1937 | Box 94 \ 2 scan0207 | |
| Interim report on measured and suggested maximum errors for Phantom Gear Box contact mesh gears. | 16th Apr 1937 | Box 94 \ 2 scan0208 | |
| Issues with gear teeth finishing, dimensional control, and resulting noise. | 16th Apr 1937 | Box 94 \ 2 scan0209 | |
| Proposal for modifications to the Phantom III gearbox stay joint due to wear found on a 10,000-mile test. | 19th Apr 1937 | Box 94 \ 2 scan0210 | |
| Alteration to the manufacturing process of Phantom III gearboxes, specifically using unlapped cones. | 20th Apr 1937 | Box 94 \ 2 scan0211 | |
| Micro-examination report detailing hardness tests and failures of cyanide-hardened gears from a Phantom III gearbox. | 20th Apr 1937 | Box 94 \ 2 scan0212 | |
| Magnified photograph (X10) of a metal component showing surface detail and wear. | 11th Aug 1936 | Box 94 \ 2 scan0213 | |
| Laboratory photomicrograph showing a material's microstructure at 150x magnification. | 11th Aug 1936 | Box 94 \ 2 scan0214 | |
| Experiments on the Phantom III gearbox to determine the cause of unsatisfactory gear changes. | 22th Apr 1937 | Box 94 \ 2 scan0215 | |
| Page 2 of a memorandum regarding the fitting of parts to experimental cars 35-EX and 33-EX. | 29th Apr 1937 | Box 94 \ 2 scan0216 | |
| Letter to The Hoffman Manufacturing Co.,Ltd., proposing the replacement of a gearbox bush with a caged roller bearing. | 29th Apr 1937 | Box 94 \ 2 scan0217 | |
| Acknowledgment of an enquiry from Hoffmann Manufacturing Co. Ltd. | 30th Apr 1937 | Box 94 \ 2 scan0218 | |
| Missing rivets from a Hub Bearing on a 35-EX Phantom III vehicle. | 25th Apr 1937 | Box 94 \ 2 scan0219 | |
| Suggestion for further dynamometer testing on hardened steel bushes in the Phantom III gearbox. | 1st May 1937 | Box 94 \ 2 scan0220 | |
| Cover note attaching a letter from Hoffmann Manufacturing Co. regarding a failed bearing on a test rig. | 4th May 1937 | Box 94 \ 2 scan0221 | |
| Letter from Hoffmann Manufacturing regarding an inspection of a Bevel Pinion Combined Thrust & Journal Race bearing. | 30th Apr 1937 | Box 94 \ 2 scan0222 | |
| Page 2 of a letter from Hoffmann Manufacturing discussing a tested bearing with a cracked outer race. | 6th May 1937 | Box 94 \ 2 scan0223 | |
| Requesting the dismantling, examination, and crack testing of a gearbox and rear axle from the 30-EX project after dynamometer testing. | 6th May 1937 | Box 94 \ 2 scan0224 | |
| The replacement of bronze bushes with hardened steel bushes in the 4.050 Centres Over Drive Gearbox. | 6th May 1937 | Box 94 \ 2 scan0225 | |
| Letter to The Hoffmann Manufacturing Co. Ltd. requesting two sets of parts for an experimental gearbox. | 6th May 1937 | Box 94 \ 2 scan0226 | |
| Letter from The Hoffmann Manufacturing Co. Ltd. regarding a bearing drawing and proposing a standard part. | 5th May 1937 | Box 94 \ 2 scan0227 | |
| Instructions for the assembly of Gearbox No.7.HS with specific shafts and drawings. | 7th May 1937 | Box 94 \ 2 scan0228 | |
| Technical memorandum discussing the design and stress testing of the Phantom III gearbox. | 10th May 1937 | Box 94 \ 2 scan0229 | |
| Test notes and data tables on rear gearbox clutch effort at various speeds. | 11th May 1937 | Box 94 \ 2 scan0230 | |
| Phantom III gearbox lubrication test. | 11th May 1937 | Box 94 \ 2 scan0231 | |
| Letter from Hoffmann Manufacturing Co. confirming an order for 2 Cages and Rollers of R.120 Roller Journal Bearings. | 13th May 1937 | Box 94 \ 2 scan0232 | |
| Specifications for rebuilding a 4.H.S. gearbox. | 14th May 1937 | Box 94 \ 2 scan0233 | |
| Letter from Ransome & Marles Bearing Co. regarding the completion date for a bearing order. | 20th Apr 1937 | Box 94 \ 2 scan0234 | |
| Listing bearing specifications and receipt dates for a Phantom III Overdrive Gearbox. | 29th Apr 1937 | Box 94 \ 2 scan0235 | |
| Requesting gearbox and rear axle repairs for car 29-EX for use at Brooklands. | 21th May 1937 | Box 94 \ 2 scan0236 | |
| Letter to Ransome & Marles Bearing Co. regarding particulars of ball bearings and arranging for test samples. | 26th May 1937 | Box 94 \ 2 scan0237 | |
| Dispatch request for a GearBox Stay assembly and its component parts for fitment to a Phantom III Chassis. | 26th May 1937 | Box 94 \ 2 scan0238 | |
| Experimental application of a Buick-type synchromesh to the 2nd speed of a Phantom III gearbox. | 29th May 1937 | Box 94 \ 2 scan0239 | |
| Availability of Gearbox Engine Stay - Phantom III sets and reminding Depots. | 2nd Jun 1937 | Box 94 \ 2 scan0240 | |
| Instruction to immediately put into production a new, shorter selector spring for the gearbox change speed mechanism. | 7th Jun 1937 | Box 94 \ 2 scan0241 | |
| Despatch of a gearbox oil sample to the Vacuum Oil Co. Ltd. | 8th Jun 1937 | Box 94 \ 2 scan0242 | |
| The production and testing of soft splined gears for the Phantom III chassis. | 8th Jun 1937 | Box 94 \ 2 scan0243 | |
| Production change for the selector spring on the Phantom III gearbox change speed mechanism. | 9th Jun 1937 | Box 94 \ 2 scan0244 | |
| The proposal to strip a P.3. gearbox with soft splined gears for inspection. | 11th Jun 1937 | Box 94 \ 2 scan0245 | |
| The failure of a 4.H.S. gearbox and requesting its rebuild with a list of required new parts. | 11th Jun 1937 | Box 94 \ 2 scan0246 | |
| Supply of Gearbox Engine Stay parts, requisition delays, and a potential drilling error. | 16th Jun 1937 | Box 94 \ 2 scan0247 | |
| Requesting parts for two more overdrive gearboxes for use in experimental cars. | 18th Jun 1937 | Box 94 \ 2 scan0248 | |
| Spigot bush clearance on a Phantom III gearbox. | 23th Jun 1937 | Box 94 \ 2 scan0249 | |
| Requesting the measurement of end play and wear examination on a gearbox removed from car 37-EX. | 24th Jun 1937 | Box 94 \ 2 scan0250 | |
| Request to modify an HS gearbox to test the tooth loading of a new universal gearbox. | 25th Jun 1937 | Box 94 \ 2 scan0251 | |
| Brief letter to F.O. Hickling of Ransome & Marles Bearing Co. requesting a phone call. | 30th Jun 1937 | Box 94 \ 2 scan0252 | |
| The required rebuild of a 4.HS gearbox using Cadillac gears and other specified parts. | 30th Jun 1937 | Box 94 \ 2 scan0253 | |
| Letter from Ransome & Marles Bearing Co. Ltd. regarding a quotation and delivery schedule for gearbox bearings. | 1st Jul 1937 | Box 94 \ 2 scan0254 | |
| Quotation from Ransome & Marles Bearing Co. Ltd. for various types of bearings. | 1st Jul 1937 | Box 94 \ 2 scan0255 | |
| Letter from Ransome & Marles Bearing Co. Ltd. confirming a telephone order for two sets of experimental gear box bearings. | 1st Jul 1937 | Box 94 \ 2 scan0256 | |
| Covering order for various bearings from Messrs Ransome & Marles. | 1st Jul 1937 | Box 94 \ 2 scan0257 | |
| Summary of results from Phantom III Gearbox Dynamometer Testing. | 2nd Jul 1937 | Box 94 \ 2 scan0258 | |
| Progress report on gearbox testing, detailing issues with gears, lubrication, and plans for further trials. | 2nd Jul 1937 | Box 94 \ 2 scan0259 | |
| Letter from Ransome & Marles Bearing Co. confirming two sets of experimental gearbox bearings have been put in hand. | 6th Jul 1937 | Box 94 \ 2 scan0260 | |
| Letter to Messrs Ransome & Marles Bearing Co. Ltd confirming an official order has been sent. | 7th Jul 1937 | Box 94 \ 2 scan0261 | |
| PH.III gearbox, discussing cars at coachbuilders and a modification to the spigot bush to prevent seizure. | 15th Jul 1937 | Box 94 \ 2 scan0262 | |
| Loose gearbox engine stay on a Phantom III and a request for a fix. | 15th Jul 1937 | Box 94 \ 2 scan0263 | |
| The introduction of an overdrive gearbox pending testing on the 32-EX model in France. | 15th Jul 1937 | Box 94 \ 2 scan0264 | |
| Seizure of a spigot bearing bush in the gearbox and suggesting altered drawing clearances. | 16th Jul 1937 | Box 94 \ 2 scan0265 | |
| Urgent introduction of the Phantom III over-drive gearbox. | 16th Jul 1937 | Box 94 \ 2 scan0266 | |
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