| Description | Date | Identifier | |
| Graphs showing test results for a worm gear in a steering box using various oils at different temperatures. | 23th Sep 1927 | Box 67 \ 4 scan0379 | |
| Performance graph for '720 Worm Motorine C' plotting force against load on the nut. | 23th Sep 1927 | Box 67 \ 4 scan0380 | |
| Summary of tests on the lubrication of the worm and nut of steering using different oils. | 17th Aug 1927 | Box 67 \ 4 scan0381 | |
| Performance and bodywork issues on a Blue Sports Car, chassis 10-EX. | 18th Aug 1927 | Box 67 \ 4 scan0382 | |
| Steering friction and 'joggles' in the 10-EX model compared to other vehicles. | 19th Aug 1927 | Box 67 \ 4 scan0383 | |
| Further tests carried out on steering systems and lubrication oils. | 1st Aug 1927 | Box 67 \ 4 scan0384 | |
| Summary of tests on the lubrication of worm and nut steering using different oils, with efficiency ratings. | 1st Aug 1927 | Box 67 \ 4 scan0385 | |
| Graph of viscosity curves for steering box oils, plotting temperature against time of efflux. | 29th Aug 1927 | Box 67 \ 4 scan0386 | |
| Steering box experiments and the superiority of Price's Amber Gear oil over other lubricating oils. | 29th Aug 1927 | Box 67 \ 4 scan0387 | |
| Scheme for a shorter pendulum lever for the Phantom steering to aid parking. | 1st Sep 1927 | Box 67 \ 4 scan0388 | |
| Comparing the lubricating properties of Castrol 'XL', 'R', and Amber Gear oils for the steering nut and worm. | 8th Sep 1927 | Box 67 \ 4 scan0389 | |
| Proposed revision to the centralised chassis lubrication system pipe on the steering pendulum lever. | 23th Sep 1927 | Box 67 \ 4 scan0390 | |
| Car development topics including suspension 'pitching', steering mechanisms, and a new turbulent aluminium head. | 30th Sep 1927 | Box 67 \ 4 scan0391 | |
| Specific features and modifications for the Sports series Phantom EAC.14. | 13th Oct 1927 | Box 67 \ 4 scan0392 | |
| The successful testing of steering worms without oil holes or grooves, recommending the modification be standardized. | 17th Oct 1927 | Box 67 \ 4 scan0393 | |
| Improvement to steering worms by removing oil holes and grooves. | 19th Oct 1927 | Box 67 \ 4 scan0394 | |
| Recommendations for steering and suspension adjustments on Capt. Kruse's car. | 11th Nov 1927 | Box 67 \ 4 scan0395 | |
| Request to obtain 2000 lbs. rating springs for a sports car to suit schedule N. sch. 2258. | 11th Nov 1927 | Box 67 \ 4 scan0396 | |
| Trial and negative assessment of a return spring in the steering column. | 11th Nov 1927 | Box 67 \ 4 scan0397 | |
| Agreeing to abandon a friction scheme in the steering column and proposing new experiments. | 9th Nov 1927 | Box 67 \ 4 scan0398 | |
| Manufacturing limits and setup of springs within a 40/50 side steering tube. | 9th Nov 1927 | Box 67 \ 4 scan0399 | |
| Experimental test results for S.S. Tube Joints, schemes N.Sch 2258 and 2301, showing a cross-section diagram and three load vs movement graphs. | 8th Nov 1927 | Box 67 \ 4 scan0400 | |
| Request to manufacture various parts with specific dimensions for tests on a 40/50 side steering tube. | 10th Nov 1927 | Box 67 \ 4 scan0401 | |
| Continuation of 'Scheme C' detailing spring ratings, washer thickness, and assembly instructions. | 11th Nov 1927 | Box 67 \ 4 scan0402 | |
| Request for full particulars of road tests regarding the deletion of oil holes and grooves in steering worms. | 11th Nov 1927 | Box 67 \ 4 scan0403 | |
| Suggesting a change in the spring rating for the side steering tube to reduce the number of different parts. | 11th Nov 1927 | Box 67 \ 4 scan0404 | |
| The decision to remove oil holes and grooves from steering worms, returning to the original design. | 14th Nov 1927 | Box 67 \ 4 scan0405 | |
| Standardisation of chassis parts by deleting oil holes and grooves in steering worms to reduce cost. | 20th Oct 1927 | Box 67 \ 4 scan0406 | |
| Form indicating a new chassis part will be introduced only after existing stock is depleted, with no associated costs for scrap or tooling. | 21th Nov 1927 | Box 67 \ 4 scan0407 | |
| Request to make a set of parts from an attached sketch for car 10-EX, detailing dashboard modifications. | 21th Nov 1927 | Box 67 \ 4 scan0408 | |
| Modification to the gear lever for 'C' steering on the 40/50 HP Phantom model. | 25th Nov 1927 | Box 67 \ 4 scan0409 | |
| Instructing the creation of a shorter nut for a .900 lead worm for experimental comparison. | 12th Dec 1927 | Box 67 \ 4 scan0410 | |
| Six recommendations for coachbuilders to improve the riding qualities and steering of Phantom chassis. | 23th Dec 1927 | Box 67 \ 4 scan0411 | |
| Steering defects in American cars and a company that rectifies them to reduce tyre wear. | 28th Dec 1927 | Box 67 \ 4 scan0412 | |
| Letter to Geoffrey Summers regarding issues with Marles steering and ongoing experiments for improvement. | 28th Dec 1927 | Box 67 \ 4 scan0413 | |
| Arranging to test a worm and nut on the 8-EX car. | 30th Dec 1927 | Box 67 \ 4 scan0414 | |
| Potential improvements to the steering and front spring arrangement. | 19th Feb 1924 | Box 67a \ 1 scan0001 | |
| Page 2 of a memo concluding the discussion on a suggested modification. | 20th May 1924 | Box 67a \ 1 scan0002 | |
| Spring deflection and pivot inclination during front wheel braking experiments. | 20th May 1924 | Box 67a \ 1 scan0003 | |
| Analysis of car springing criticism and proposed solutions for improved ride comfort. | 12th Jul 1924 | Box 67a \ 1 scan0004 | |
| Vehicle complaints, focusing on suspension, engine, and brake performance for model 46-PK. | 15th Jul 1924 | Box 67a \ 1 scan0005 | |
| The test drive and comparison of suspension performance on various car models. | 15th Jul 1924 | Box 67a \ 1 scan0006 | |
| Car spring stiffness for French versus British roads and the logistics of demonstration cars. | 15th Jul 1924 | Box 67a \ 1 scan0007 | |
| Unsatisfactory springing issues and testing on car 46-PK. | 16th Jul 1924 | Box 67a \ 1 scan0008 | |
| 'nip' and friction measurements for the road springs of a 46-PK open touring car. | 19th Aug 1924 | Box 67a \ 1 scan0009 | |
| Testing of stiffer springs and the effect of front axle weight on car ride quality. | 18th Jul 1924 | Box 67a \ 1 scan0010 | |
| Specification sheet for spring No. F.2441, showing data for a 9-leaf and a 10-leaf variant. | 18th Jul 1924 | Box 67a \ 1 scan0011 | |
| Graph and data table showing the deflection test results for an off-side road spring. | 18th Jul 1924 | Box 67a \ 1 scan0012 | |
| Deflection test chart and data table for a near-side road spring, model 46PK. | 9th Sep 1924 | Box 67a \ 1 scan0013 | |
| Design and stiffness of front springs for experimental cars in France. | 9th Sep 1924 | Box 67a \ 1 scan0014 | |
| Improvements to spring and axle design, including clip quantity, central bolt size, and stiffness. | 11th Sep 1924 | Box 67a \ 1 scan0015 | |
| Secret memo discussing issues with Firths' springs and recommending new spring specifications. | 11th Sep 1924 | Box 67a \ 1 scan0016 | |
| Secret memo detailing modifications made to front springs, referencing a new scheme and layout. | 17th Sep 1924 | Box 67a \ 1 scan0017 | |
| Buffer clearance in relation to fitting stiffer springs, following a suggestion by Mr. Royce. | 8th Oct 1924 | Box 67a \ 1 scan0018 | |
| Results of a check on front springs, with measurements for camber and buffer clearance before and after testing. | 12th Nov 1924 | Box 67a \ 1 scan0019 | |
| Authorisation and production of new 45' springs with supplier Messrs Firths. | 5th Jan 1925 | Box 67a \ 1 scan0020 | |
| Redesign and production of 45-inch springs by the company Firths. | 26th Jan 1925 | Box 67a \ 1 scan0021 | |
| Secret memo from BJ to Hs questioning an unauthorized change to the car's rear springing. | 22th Jul 1924 | Box 67a \ 1 scan0022 | |
| Outlining a parts ordering policy for spring modifications on the 'V' series to accommodate a new subframe. | 17th Feb 1925 | Box 67a \ 1 scan0023 | |
| Performance and potential improvements for Series 'V' front springs. | 3rd Apr 1925 | Box 67a \ 1 scan0024 | |
| Secret memo regarding the unsatisfactory 8,000-mile life of 'V' Series front springs, recommending testing of experimental sets in France. | 1st Apr 1925 | Box 67a \ 1 scan0025 | |
| Specification sheet for a bumper test on a 'V' series chassis, detailing existing and new parts. | 7th Apr 1925 | Box 67a \ 1 scan0026 | |
| Test report page detailing conditions and a summary of component failures. | 7th Apr 1925 | Box 67a \ 1 scan0027 | |
| Summary table detailing spring failures with reference numbers, positions, and material properties. | 7th Apr 1925 | Box 67a \ 1 scan0028 | |
| Notes on durability testing of various vehicle components including wheels, suspension, brackets and stays. | 25th Feb 1925 | Box 67a \ 1 scan0029 | |
| Wheel and frame component performance, detailing failures in springs and cross members. | 25th Feb 1925 | Box 67a \ 1 scan0030 | |
| Potential chassis improvements for a future car, including issues with exhaust, overheating, suspension, and steering. | 15th Apr 1925 | Box 67a \ 1 scan0031 | |
| Front spring life after a 10,000-mile test on a 'V' series car in France. | 13th May 1925 | Box 67a \ 1 scan0032 | |
| Copy of a telegram with instructions for modifying front springs for the India market. | 15th May 1925 | Box 67a \ 1 scan0033 | |
| The effects of 'Normal' and 'Loaded' conditions on a 'V' series car's suspension and clearance. | 16th May 1925 | Box 67a \ 1 scan0034 | |
| Comparing the steering system of a Hispano car with in-house designs and discussing potential improvements. | 29th Jun 1925 | Box 67a \ 1 scan0035 | |
| Advancements and considerations for steering systems and wheel dynamics. | 13th Jul 1925 | Box 67a \ 1 scan0036 | |
| Requesting the detailed measurement and analysis of springs from an American car, comparing them to existing designs. | 13th Jul 1925 | Box 67a \ 1 scan0037 | |
| Lubrication issue with the rear anchorage of the front springs on Mr. Royce's 'V' Series car. | 21th Jul 1925 | Box 67a \ 1 scan0038 | |
| Implementation of a new scheme for oiling a shackle pin in an anchor bracket for a 40/50 HP model. | 7th Aug 1925 | Box 67a \ 1 scan0039 | |
| Issues with the front springs for the Phantom and 20 HP models, suggesting potential improvements and comparisons. | 23th Sep 1925 | Box 67a \ 1 scan0040 | |
| Investigating high-speed steering wobbles by modifying leaf springs. | 23th Oct 1925 | Box 67a \ 1 scan0041 | |
| Bumper test for front springs on a Phantom chassis. | 24th Nov 1925 | Box 67a \ 1 scan0042 | |
| Time comparison memo for a process with and without interleaving material. | 17th Dec 1925 | Box 67a \ 1 scan0043 | |
| Inconsistent results from bumper tests of front springs for the 'New Phantom' chassis. | 17th Dec 1925 | Box 67a \ 1 scan0044 | |
| Letter from supplier Thos. Firth & Sons Ltd. regarding variability in test results for 40/50 HP front springs. | 16th Dec 1925 | Box 67a \ 1 scan0045 | |
| Inquiry from the Experimental Department about customer complaints regarding vehicle springing. | 21th Dec 1925 | Box 67a \ 1 scan0046 | |
| Internal memorandum responding to two questions regarding vehicle springing. | 22th Dec 1925 | Box 67a \ 1 scan0047 | |
| Issues and calculations related to vehicle rear springing. | 31th Dec 1925 | Box 67a \ 1 scan0048 | |
| Analysis of spring stress, safety margins, and potential for breakage in different vehicle models. | 31th Dec 1925 | Box 67a \ 1 scan0049 | |
| Comparison of chassis and suspension characteristics between the 40/50 HP and 20 HP models, focusing on the causes of roughness. | 31th Dec 1925 | Box 67a \ 1 scan0050 | |
| Issues and variations with the rear springing of the New Phantom 40/50 HP model. | 5th Jan 1926 | Box 67a \ 1 scan0051 | |
| Car spring performance, loading, and ride quality for various models. | 5th Jan 1926 | Box 67a \ 1 scan0052 | |
| Guidelines on calculating vehicle load based on car type, seating, and luggage. | 5th Jan 1926 | Box 67a \ 1 scan0053 | |
| Phantom model springing, discussing stiffness, rating calculations, and manufacturing limits. | 6th Jan 1926 | Box 67a \ 1 scan0054 | |
| Classification of springs based on poundage tolerances and defending departmental practices. | 6th Jan 1926 | Box 67a \ 1 scan0055 | |
| Car springing, periodicity calculations, and passenger comfort for different car models. | 6th Jan 1926 | Box 67a \ 1 scan0056 | |
| Design challenges of leaf springs to accommodate a wide variety of customer loads and body types. | 6th Jan 1926 | Box 67a \ 1 scan0057 | |
| Vehicle performance issues under full load and incorrect weight estimates. | 6th Jan 1926 | Box 67a \ 1 scan0058 | |
| Steering wobble and springing issues, with differing opinions, on the 11-EX car. | 19th Jan 1926 | Box 67a \ 1 scan0059 | |
| Confirming the correct weight ratings for the rear springs on an Experimental Phantom Car. | 22th Jan 1926 | Box 67a \ 1 scan0060 | |
| Replacement and comparison of rear springing for various car models. | 22th Jan 1926 | Box 67a \ 1 scan0061 | |
| Comparison of springing issues and customer complaints between the 40/50 HP and 20 HP models. | 22th Jan 1926 | Box 67a \ 1 scan0062 | |
| Analysis of car frame flexibility and its effect on passenger comfort, proposing further testing. | 22th Jan 1926 | Box 67a \ 1 scan0063 | |
| Typed memorandum page discussing car suspension, criticising it as the worst feature and comparing it unfavourably to the Lancia Lambda's. | 22th Jan 1926 | Box 67a \ 1 scan0064 | |
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