| Description | Date | Identifier | |
| Technical memo discussing improvements to a universal joint design, comparing it to the Spicer joint. | 8th Oct 1921 | Box 66 \ 4 scan0300 | |
| Development strategy for the Goshawk and Seagull chassis, with notes on universal joints. | 7th Feb 1923 | Box 66 \ 4 scan0301 | |
| Tests conducted to find a method for retaining oil in the 40/50 HP Universal Joint. | 3rd Mar 1923 | Box 66 \ 4 scan0302 | |
| Improvement to the oil retaining qualities of the Universal Joint. | 9th Mar 1923 | Box 66 \ 4 scan0303 | |
| Standardisation sheet for removing end threads from piece no. 3233.A. | 9th Mar 1923 | Box 66 \ 4 scan0304 | |
| Standardisation document for removing the end threads from piece no. 3233.A on chassis parts. | 12th Feb 1923 | Box 66 \ 4 scan0305 | |
| Standardisation sheet for removing the end threads from piece number 3233.A. | 9th Mar 1923 | Box 66 \ 4 scan0306 | |
| The lubrication of the universal joint at the back of the gearbox. | 30th Oct 1923 | Box 66 \ 4 scan0307 | |
| Joint lubrication, comparing oil versus grease for the American market. | 30th Oct 1923 | Box 66 \ 4 scan0308 | |
| Signature and approval process for standardisation sheet X.3324, an oil guard for a universal joint. | 27th Nov 1923 | Box 66 \ 4 scan0309 | |
| Standardisation of an oil guard for the universal joint to prevent oil leaks. | 30th Oct 1923 | Box 66 \ 4 scan0310 | |
| History and proposed design modifications for the lubricator on the rear universal joint. | 20th Jun 1924 | Box 66 \ 4 scan0311 | |
| Telegram requesting a clutch universal joint be sent with a car. | 1st Jul 1926 | Box 66 \ 4 scan0312 | |
| Proposals for lightening the propeller shaft and testing various bearings on the Phantom model. | 8th Oct 1927 | Box 66 \ 4 scan0313 | |
| Despatch note for a Universal Joint sent to Rolls-Royce of America Inc. in Springfield, Mass. | 14th Nov 1927 | Box 66 \ 4 scan0314 | |
| Modification to the centralised chassis lubrication system. | 17th May 1928 | Box 66 \ 4 scan0315 | |
| Letter concerning excessive wear in 40/50 spheres and the need for a modification to improve lubrication. | 7th Nov 1928 | Box 66 \ 4 scan0316 | |
| Excessive wear on 40/50 spheres and requesting a faulty universal joint be returned to Derby for analysis. | 1st Nov 1928 | Box 66 \ 4 scan0317 | |
| Follow-up request for comments regarding excessive wear in 40/50 HP Spheres. | 26th Nov 1928 | Box 66 \ 4 scan0318 | |
| Excessive wear and oil leakage on 40/50 spheres, recommending a paraffin test to diagnose the issue. | 28th Nov 1928 | Box 66 \ 4 scan0319 | |
| On the arrangement and testing of universal joints for the 40/50 HP and 20 HP propeller shafts. | 7th Dec 1928 | Box 66 \ 4 scan0320 | |
| Recommendation for propeller shaft lubrication intervals for 20 HP and 40/50 HP chassis. | 14th Aug 1929 | Box 66 \ 4 scan0321 | |
| Proposed increase in vehicle track width for Colonial cars and its impact on various components. | 12th May 1925 | Box 66 \ 4 scan0322 | |
| Rear axle ratios and their effect on the performance of the 'New Phantom' car. | 28th Jul 1925 | Box 66 \ 4 scan0323 | |
| Request to alter the Phantom rear axle track to 57' to match the front track. | 23th Sep 1925 | Box 66 \ 4 scan0324 | |
| Response from the Production Test Department regarding experience with 14-tooth axles on a New Phantom Chassis. | 14th Oct 1925 | Box 66 \ 4 scan0325 | |
| The preference for 15-tooth axles over 14-tooth axles for the 29-LC chassis based on performance and body weight. | 14th Oct 1925 | Box 66 \ 4 scan0326 | |
| Customer dissatisfaction with the New Phantom's performance and considering experiments with 14-tooth axles. | 16th Nov 1925 | Box 66 \ 4 scan0327 | |
| Removal of ribs on Phantom brake drums as part of a weight-reducing campaign. | 8th Nov 1925 | Box 66 \ 4 scan0328 | |
| Phantom axle ratios and their effects on performance characteristics like engine noise, consumption, and hill climbing ability. | 23th Nov 1925 | Box 66 \ 4 scan0329 | |
| The rear axle track width for the New Phantom model. | 14th Dec 1925 | Box 66 \ 4 scan0330 | |
| Page discussing the effects of axle ratios on speed, fuel consumption, and engine temperature. | 11th Nov 1925 | Box 66 \ 4 scan0331 | |
| Testing of back axle controls for the Phantom model, specifically the EAC.1 and EAC.7. | 27th Feb 1926 | Box 66 \ 4 scan0332 | |
| The use of a 14-tooth axle and exhaust popping on the New Phantom. | 17th Mar 1926 | Box 66 \ 4 scan0333 | |
| Letter to Mr. Howledge seeking Mr. Royce's opinion on issues with 14-tooth axles and exhaust popping on Phantom models. | 17th Mar 1926 | Box 66 \ 4 scan0334 | |
| Letter discussing a popping sound in the exhaust and suggesting the matter be presented to Mr. Royce. | 17th Mar 1926 | Box 66 \ 4 scan0335 | |
| Letter from Rolls-Royce of America requesting a change in axle gear ratio for Phantom chassis shipped to the US. | 10th Feb 1926 | Box 66 \ 4 scan0336 | |
| Two memorandums discussing axle ratios for Phantom Chassis intended for the American market. | 2nd Mar 1926 | Box 66 \ 4 scan0337 | |
| Internal memorandum discussing axle ratio tests for the Phantom chassis intended for the American market. | 2nd Mar 1926 | Box 66 \ 4 scan0338 | |
| Defects of front axle control and considering alternative designs. | 18th Apr 1926 | Box 66 \ 4 scan0339 | |
| Issues and advantages of different back axle controls and universal joints. | 21th Apr 1926 | Box 66 \ 4 scan0340 | |
| Seeking an opinion on supplying 14-tooth axles for Phantom models to meet customer demand. | 27th Apr 1926 | Box 66 \ 4 scan0341 | |
| Seeking agreement on the standard fitting of 14-tooth axles for New Phantom cars. | 13th Apr 1926 | Box 66 \ 4 scan0342 | |
| Reluctant approval for the use of a 14 tooth axle on the Phantom model. | 21th Apr 1926 | Box 66 \ 4 scan0343 | |
| Pros and cons of fitting a 14-tooth axle to Phantom cars, suggesting weight reduction as an alternative. | 28th Apr 1926 | Box 66 \ 4 scan0344 | |
| Phantom back axle ratio, recommending the 14-tooth axle for better performance. | 10th Jun 1926 | Box 66 \ 4 scan0345 | |
| Query regarding the effects of fitting 14-tooth axles to Phantom cars and a request for previous test data. | 25th Jun 1926 | Box 66 \ 4 scan0346 | |
| Cancelling work on rear axle schemes 2140, 2149 & 2150, to be replaced by new schemes 2232 & 2234. | 19th Aug 1926 | Box 66 \ 4 scan0347 | |
| Letter discussing oil leakage issues from rear axle differentials and gearboxes, with proposed solutions. | 29th Nov 1926 | Box 66 \ 4 scan0348 | |
| Letter inquiring about the cause of oil leaks from rear axles. | 2nd Dec 1926 | Box 66 \ 4 scan0349 | |
| Modifications for the 20 HP model, focusing on body weight, back axle ratios, and engine improvements. | 3rd Dec 1926 | Box 66 \ 4 scan0350 | |
| Note regarding a lightweight 20 HP chassis and modifications to the vertical louvres and front axle control. | 28th Jan 1927 | Box 66 \ 4 scan0351 | |
| The disappointing performance of a 40/50 HP model with a low axle ratio, suggesting a pinion modification. | 28th Jan 1927 | Box 66 \ 4 scan0352 | |
| Two methods for adding permanent packing to the back axle. | 6th Apr 1927 | Box 66 \ 4 scan0353 | |
| Rear axle ratio, instructing for an 18 tooth Gleason pinion to be fitted to 10-EX. | 25th Apr 1927 | Box 66 \ 4 scan0354 | |
| Epidemic of complaints regarding premature wear on rear axle components in New Phantom chassis. | 15th Mar 1927 | Box 66 \ 4 scan0355 | |
| Complaints of rear axle 'periods' versus noise from worn ball bearings. | 20th Sep 1927 | Box 66 \ 4 scan0356 | |
| Rejecting a proposal for a duralumin rear axle brake bracket as too expensive and suggesting an alternative. | 6th Oct 1927 | Box 66 \ 4 scan0357 | |
| Implementation of improvements for the Sports Phantom and the next 10,000 miles car. | 8th Oct 1927 | Box 66 \ 4 scan0358 | |
| Drawings for the adaptation of centralised lubrication on the rear axle and modifications for new brake components. | 13th Oct 1927 | Box 66 \ 4 scan0359 | |
| Design and thickness of a solid torque tube. | 8th Oct 1927 | Box 66 \ 4 scan0360 | |
| Standardization of axle ratios for the 40/50 HP model to improve acceleration in response to increasing traffic density. | 14th Nov 1927 | Box 66 \ 4 scan0361 | |
| Potential introduction of a 14-tooth axle for Phantom cars, weighing its advantages against potential issues. | 25th Nov 1927 | Box 66 \ 4 scan0362 | |
| Proposal to fit a 14-tooth axle to Phantom cars for improved acceleration. | 28th Nov 1927 | Box 66 \ 4 scan0363 | |
| Phantom back axle ratio, comparing 14-tooth and 15-tooth axles for different markets and driving conditions. | 10th Jun 1926 | Box 66 \ 4 scan0364 | |
| Introduction and production viability of 14-tooth axles versus 15-tooth axles. | 1st Dec 1927 | Box 66 \ 4 scan0365 | |
| Standardising 14-tooth axles for chassis ordered for Australia. | 12th Dec 1927 | Box 66 \ 4 scan0366 | |
| Standardisation of a 14/52 axle ratio for chassis parts. | 28th Nov 1927 | Box 66 \ 4 scan0367 | |
| Outlining recommendations for different axle ratios based on car weight and market. | 9th Jan 1928 | Box 66 \ 4 scan0368 | |
| Acceleration curves and the effect of a 14-tooth axle on engine performance. | 19th Mar 1928 | Box 66 \ 4 scan0369 | |
| Recommending the 14-tooth axle as the all-round standard over the 15-tooth axle. | 9th Sep 1928 | Box 66 \ 4 scan0370 | |
| Recommendation to fit a 14-tooth axle to a car for South Africa to counteract power loss from high altitude. | 2nd Nov 1928 | Box 66 \ 4 scan0371 | |
| Confirmation to fit a 14-tooth axle to Chassis No. 34-WR for the South African Trials. | 3rd Nov 1928 | Box 66 \ 4 scan0372 | |
| Instruction regarding a regrouped instrument board, changing from cream to black dials with white figures. | 4th Apr 1929 | Box 66 \ 4 scan0373 | |
| Instruction to line the narrow hand brake on the 40/50 rear axle with Ferodo Bonded Asbestos. | 11th Mar 1930 | Box 66 \ 4 scan0374 | |
| Confirming the dispatch of curves of axle movements, taken from a Phantom 1 vehicle. | 25th Nov 1931 | Box 66 \ 4 scan0375 | |
| Graphs of rear axle motion experiments on a Phantom 98 N.K. over various road surfaces and damping settings. | 29th Oct 1928 | Box 66 \ 4 scan0376 | |
| Graph sheet from rear axle motion experiments on a Phantom 98 N.K. | 25th Nov 1931 | Box 66 \ 4 scan0377 | |
| Query and response regarding the acceleration performance and pull-up distances of a 6.EX type car. | 28th Aug 1923 | Box 66 \ 5 scan0001 | |
| Acceleration and braking tests for the 6-EX car. | 29th Aug 1923 | Box 66 \ 5 scan0002 | |
| 4-wheel brakes and front axle control, detailing rig and road test results. | 1st Mar 1925 | Box 66 \ 5 scan0003 | |
| Graph plotting the average coefficient of friction and temperature of Ferodo bonded asbestos lining over a one-hour period. | 17th Apr 1925 | Box 66 \ 5 scan0004 | |
| The causes and characteristics of squeaking brakes on the 20 HP model. | 17th Apr 1925 | Box 66 \ 5 scan0005 | |
| Causes and potential cures for brake squeaking on various models. | 7th Apr 1925 | Box 66 \ 5 scan0006 | |
| Investigating permanent cures for squeaking brakes, including consultations with Ferodo and testing dampers. | 17th Apr 1925 | Box 66 \ 5 scan0007 | |
| Various methods tested to reduce brake squeaking. | 17th Apr 1925 | Box 66 \ 5 scan0008 | |
| Attempt to reduce brake squeak by using a strip of Ferodo. | 1st Apr 1925 | Box 66 \ 5 scan0009 | |
| Standardisation report for a lightened front brake cam operating shaft to reduce wear on bushes. | 23th Apr 1925 | Box 66 \ 5 scan0010 | |
| Questioning why a suggested adjustable end for the 'V' Series front wheel brake pull rod was never adopted. | 6th May 1925 | Box 66 \ 5 scan0011 | |
| Decision between two different schemes for 'V' series front wheel brakes. | 20th May 1925 | Box 66 \ 5 scan0012 | |
| 4-wheel brake distribution and comparing braking figures for different configurations. | 25th May 1925 | Box 66 \ 5 scan0013 | |
| Servo braking efficiency and its distribution in relation to vehicle weight. | 10th Jun 1925 | Box 66 \ 5 scan0014 | |
| Secret memorandum detailing modifications for front brake adjustment and servo system calculations. | 10th Jun 1925 | Box 66 \ 5 scan0015 | |
| The second page of a typed memorandum discussing the need to urge a rapid move once a decision is made. | 21th Jul 1925 | Box 66 \ 5 scan0016 | |
| Experimental cover for brake drums to prevent mud and stone ingress, referencing a complaint from Patiala. | 21th Jul 1925 | Box 66 \ 5 scan0017 | |
| Proposed design and material for a rear brake cover on the 40/50 HP chassis. | 22th Jul 1925 | Box 66 \ 5 scan0018 | |
| Customer complaints of a squawking noise from the rear brake drum due to small stones, proposing two experimental solutions. | 1st Aug 1925 | Box 66 \ 5 scan0019 | |
| Complaints of squeaking brakes on 40/50 and 20-HP cars, proposing a modification and cancelling previous instructions. | 13th Aug 1925 | Box 66 \ 5 scan0020 | |
| The effects of four-wheel braking and front axle rigidity on car control and steering safety. | 7th Sep 1925 | Box 66 \ 5 scan0021 | |
| Calculations and findings on steering moments and car behavior during turning and braking. | 12th Jun 1925 | Box 66 \ 5 scan0022 | |
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