| Description | Date | Identifier | |
| Tabulating the results of road spring failure tests. | 3rd Jul 1925 | Box 106 \ 1 scan0048 | |
| The failure of a rear spring and sheared safety dogs on vehicle 9-G-111 during a 10,000 miles test. | 29th Aug 1925 | Box 106 \ 1 scan0049 | |
| Broken N.S.R. spring on Chassis 9-G-111. | 27th Aug 1925 | Box 106 \ 1 scan0050 | |
| Failures of 20 HP road springs observed during a 10,000-mile test in France. | 14th Sep 1925 | Box 106 \ 1 scan0051 | |
| Diagram illustrating front spring leaf failures, showing examples of cracks and average fracture positions during tests in France. | 12th Jan 1925 | Box 106 \ 1 scan0052 | |
| Quality of front springs for the Phantom and 20 HP models and suggesting improvements. | 23th Sep 1925 | Box 106 \ 1 scan0053 | |
| Testing of Lemoine springs on the 20 HP car. | 26th Sep 1925 | Box 106 \ 1 scan0054 | |
| Procurement and testing of Lemoine springs for the 20 HP 'India' chassis. | 1st Sep 1925 | Box 106 \ 1 scan0055 | |
| Revised design for India front springs, proposed by Mr. Royce to increase their lifespan. | 22th Oct 1925 | Box 106 \ 1 scan0056 | |
| Supply and testing of 20 HP chassis front springs. | 12th Jan 1926 | Box 106 \ 1 scan0057 | |
| Comparing the suspension springing characteristics and deflection of various car models. | 22th Jan 1926 | Box 106 \ 1 scan0058 | |
| Report comparing customer complaints about springing on the 40/50 HP and 20 HP models. | 22th Jan 1926 | Box 106 \ 1 scan0059 | |
| Vehicle frame flexibility, springing issues, passenger comfort, and proposed testing methods. | 22th Jan 1926 | Box 106 \ 1 scan0060 | |
| Typed memorandum comparing the car's springing to that of a Lancia Lambda. | 22th Jan 1926 | Box 106 \ 1 scan0061 | |
| Comparison of springing, weight distribution, and allowances for the 20 HP and 40/50 HP models. | 22th Jan 1926 | Box 106 \ 1 scan0062 | |
| Spare wheel weights, weight distribution, and spring modifications for 20 HP and 40/50 HP models. | 22th Jan 1926 | Box 106 \ 1 scan0063 | |
| Calculation sheet for spring loads on the 7-EX Phantom Car, specified for running in France. | 22th Jan 1926 | Box 106 \ 1 scan0064 | |
| Comparison of rear spring deflection and buffer clearance between the 20 HP and 40/50 HP models. | 22th Jan 1926 | Box 106 \ 1 scan0065 | |
| Springing load calculations and specifications for the New Phantom and 20 HP models. | 25th Jan 1926 | Box 106 \ 1 scan0066 | |
| Technical comparison of rear spring and suspension characteristics between the New Phantom and the 20 HP R-R models, relative to a 20 HP Lanchester. | 27th Jan 1926 | Box 106 \ 1 scan0067 | |
| Comparative analysis of suspension systems for the New Phantom and 20 HP models, discussing damping, springs, and rolling. | 23th Feb 1926 | Box 106 \ 1 scan0068 | |
| Letter discussing tests and contradictory reports on Phantom springing between the UK and US offices. | 23th Feb 1926 | Box 106 \ 1 scan0069 | |
| Technical letter discussing vehicle springing, road shocks, and ride quality comparisons between different models. | 26th Feb 1926 | Box 106 \ 1 scan0070 | |
| Alternative design for the front end of rear springs, comparing it to the 20 HP model. | 26th Feb 1926 | Box 106 \ 1 scan0071 | |
| Phantom's ride comfort in the rear seats compared to the Silver Ghost, with suggestions for improvement. | 18th Mar 1926 | Box 106 \ 1 scan0072 | |
| Technical memorandum discussing improvements to vehicle suspension, including hydraulic shock dampers, tyres, and springs. | 9th Mar 1926 | Box 106 \ 1 scan0073 | |
| Suspension and balance differences between the Silver Ghost, 20 HP, and New Phantom chassis. | 9th Mar 1926 | Box 106 \ 1 scan0074 | |
| Complaints about the Phantom model's springing, specifically a bouncing issue for rear passengers. | 22th Mar 1926 | Box 106 \ 1 scan0075 | |
| Tyre pressure tests and their effect on riding complaints for Phantom and Silver Ghost models. | 30th Mar 1926 | Box 106 \ 1 scan0076 | |
| Front springs, rebound leaves, and shock damper schemes. | 30th Mar 1926 | Box 106 \ 1 scan0077 | |
| Clarifying misunderstandings regarding suspension, tyres, and shock dampers for RR cars. | 31th Mar 1926 | Box 106 \ 1 scan0078 | |
| Technical discussion on vehicle suspension, damping, steering, and wheel/tyre performance. | 31th Mar 1926 | Box 106 \ 1 scan0079 | |
| Vehicle steering, springing, and tyre performance issues and potential improvements. | 10th Apr 1926 | Box 106 \ 1 scan0080 | |
| Outlining proposed suspension experiments and modifications for the 20 HP, Phantom, and Silver Ghost models. | 10th Apr 1926 | Box 106 \ 1 scan0081 | |
| Crude method for comparing the riding qualities and suspension of cars. | 20th Apr 1926 | Box 106 \ 1 scan0082 | |
| Technical analysis of vehicle suspension components and their effect on riding comfort. | 20th Apr 1926 | Box 106 \ 1 scan0083 | |
| Report page detailing tests on vehicle suspension, centre of gravity, and weight distribution. | 20th Apr 1926 | Box 106 \ 1 scan0084 | |
| Test comparing ride comfort between a 20 HP car and a New Phantom using water displacement. | 20th Apr 1926 | Box 106 \ 1 scan0085 | |
| Front spring deflection and its effect on riding comfort and high-speed stability. | 22th Apr 1926 | Box 106 \ 1 scan0086 | |
| Inadequate rear suspension for French roads, recommending hydraulic shock dampers. | 22th Apr 1926 | Box 106 \ 1 scan0087 | |
| Calculated centre of percussion for the New Phantom and 20HP suspension. | 26th Apr 1926 | Box 106 \ 1 scan0088 | |
| Confirming a telegram and discussing modifications to a servo braking system, comparing it with Hispano and 40/50 HP models. | 15th May 1926 | Box 106 \ 1 scan0089 | |
| Technical memorandum discussing gear design, splines, and a damping segment. | 15th May 1926 | Box 106 \ 1 scan0090 | |
| Technical report discussing friction dampers and front spring issues, including camber and rubber buffers. | 15th May 1926 | Box 106 \ 1 scan0091 | |
| Potential improvements to braking and suspension systems. | 30th Jul 1926 | Box 106 \ 1 scan0092 | |
| Sending a 20 HP car fitted with the latest steering, axle, and dampers. | 30th Jul 1926 | Box 106 \ 1 scan0093 | |
| The fitting of hydraulic shock dampers to a 20 HP car and a Phantom car, detailing their availability. | 7th Aug 1926 | Box 106 \ 1 scan0094 | |
| Road test results and spring adjustments for Sir John Latta's car, chassis GCK-52. | 1st Aug 1926 | Box 106 \ 1 scan0095 | |
| Comparing the riding quality and oscillation of a Silver Ghost and a Phantom. | 11th Oct 1926 | Box 106 \ 1 scan0096 | |
| Vehicle suspension dynamics, comparing oscillation and pitching speeds of different car models. | 11th Oct 1926 | Box 106 \ 1 scan0097 | |
| Vehicle suspension dynamics, focusing on pitching speeds, oscillations, and spring performance. | 11th Oct 1926 | Box 106 \ 1 scan0098 | |
| Investigations into spring stiffness, riding comfort, and oscillation characteristics. | 20th Dec 1926 | Box 106 \ 1 scan0099 | |
| Ineffective hydraulic dampers on car 9-G-111 and the supply of new springs to improve performance. | 20th Dec 1926 | Box 106 \ 1 scan0100 | |
| Superiority of a simple rivetted on clip road spring design over more costly schemes for the 40/50 & 20 HP chassis. | 5th Apr 1927 | Box 106 \ 1 scan0101 | |
| Specification and stock sheet for front and rear springs used on 20 HP models. | 1st May 1927 | Box 106 \ 1 scan0102 | |
| Specification and usage table for 20 HP Springs. | 21th May 1927 | Box 106 \ 1 scan0103 | |
| Design of riveted-on road spring clips for the 40/50 and 20 HP models. | 5th Mar 1927 | Box 106 \ 1 scan0104 | |
| Five proposals for improving the riding qualities of the 40/50 and 20 HP car models. | 9th Jul 1927 | Box 106 \ 1 scan0105 | |
| Confirming the return of a front spring and shock damper for chassis 10-G-111 to the Experimental Department. | 8th Aug 1927 | Box 106 \ 1 scan0106 | |
| Standardisation document for Road Spring Plate Clips to improve design and reduce cost. | 7th Sep 1927 | Box 106 \ 1 scan0107 | |
| Form for the standardization of chassis parts, including details on fitting, testing, and costs. | 3rd Oct 1927 | Box 106 \ 1 scan0108 | |
| Standardisation of chassis parts, specifically regarding the material for front road springs. | 3rd Oct 1927 | Box 106 \ 1 scan0109 | |
| Internal order memo for two experimental 20-HP Chassis rear springs with an altered camber. | 6th Oct 1927 | Box 106 \ 1 scan0110 | |
| Instructions to remove the front spring packing on the 20-HP 'M' Series chassis and bolt the spring directly to the axle pad. | 1st Nov 1927 | Box 106 \ 1 scan0111 | |
| Instructions for lowering the chassis of 20 HP and Phantom models by reducing packing and modifying springs. | 17th Nov 1927 | Box 106 \ 1 scan0112 | |
| Road test report on 20 HP suspension modifications, noting a tendency to pitch at high speeds. | 21th Nov 1927 | Box 106 \ 1 scan0113 | |
| Suspension dynamics and the ratio K²/ab to avoid pitching in various car models including the Phantom and 20 HP. | 1st Dec 1927 | Box 106 \ 1 scan0114 | |
| Continued discussion on car suspension, mentioning the Lancia, Phantom, and the benefits of a short engine. | 14th Dec 1927 | Box 106 \ 1 scan0115 | |
| The rear spring front anchorage for the 'India 3' project, including details on a new forging. | 14th Dec 1927 | Box 106 \ 1 scan0116 | |
| Results of fitting stiffer springs to a 20 HP car for a customer. | 23th Dec 1927 | Box 106 \ 1 scan0117 | |
| Suspension design, damping, and weight distribution for 20 HP and 40/50 HP models. | 14th Jan 1928 | Box 106 \ 1 scan0118 | |
| Need to increase front buffer clearance and improve vehicle damping. | 10th Mar 1928 | Box 106 \ 1 scan0119 | |
| Spring ratings and definitions, with calculations for cantilever springs and a request for Australian specifications. | 10th Mar 1928 | Box 106 \ 1 scan0120 | |
| Potential improvements to the central oiling connection for the back axle, suggesting a simpler design. | 14th Apr 1928 | Box 106 \ 1 scan0121 | |
| Road spring specifications and orders for India and EAC models. | 15th May 1928 | Box 106 \ 1 scan0122 | |
| Modifications to the rear springs, shackle, and dumb iron for the 'India 3' project. | 22th May 1928 | Box 106 \ 1 scan0123 | |
| The adaptation of the front springs' rear anchorage for centralised lubrication. | 22th May 1928 | Box 106 \ 1 scan0124 | |
| Order request to Messrs. Firths for eight pairs of road springs of varying weights for the INDIA III project. | 28th Jun 1928 | Box 106 \ 1 scan0125 | |
| Riding qualities of the Phantom and 20 HP models, focusing on low-pressure tyres and road spring characteristics. | 20th Jul 1928 | Box 106 \ 1 scan0126 | |
| Technical memo discussing improvements to vehicle suspension, specifically the use of more flexible springs and hydraulic shock dampers. | 23th Jul 1923 | Box 106 \ 1 scan0127 | |
| Requesting a report on improving vehicle riding qualities by investigating tyres, springs, and shock dampers. | 23th Jul 1923 | Box 106 \ 1 scan0128 | |
| Springing specifications for the Phantom car, including buffer clearance and spring stiffness. | 24th Jul 1928 | Box 106 \ 1 scan0129 | |
| Numerous complaints and replacements due to spring breakages on Phantom and other HP models. | 23th Jul 1928 | Box 106 \ 1 scan0130 | |
| Analysis of springing issues on the 20 HP car, comparing different spring setups and road conditions. | 23th Jul 1928 | Box 106 \ 1 scan0131 | |
| Internal discussion on suspension issues and potential improvements for the Phantom & 40/50 HP models. | 27th Jul 1928 | Box 106 \ 1 scan0132 | |
| Springing tests, complaints of high-speed instability, and low-speed jolting on the Phantom model. | 27th Jul 1928 | Box 106 \ 1 scan0133 | |
| Pros and cons of different road spring designs and manufacturing processes. | 1st Aug 1928 | Box 106 \ 1 scan0134 | |
| Comparison of the quality and cost of Firth springs versus Lemoine and American springs. | 16th Aug 1928 | Box 106 \ 1 scan0135 | |
| Specifying the correct road spring weights for car 12-G-4 and noting the currently fitted incorrect springs. | 16th Aug 1928 | Box 106 \ 1 scan0136 | |
| Requesting the measurement of maximum buffer deflection on 20 HP and 40/50 HP models during a 10,000-mile test in France. | 23th Aug 1928 | Box 106 \ 1 scan0137 | |
| Suggesting sending specific front and rear springs for chassis GYL-25 and discussing a related order. | 27th Aug 1928 | Box 106 \ 1 scan0138 | |
| Providing guidance and qualifications for car springing charts across different models. | 27th Aug 1928 | Box 106 \ 1 scan0139 | |
| Front springs for British versus Continental conditions. | 27th Aug 1928 | Box 106 \ 1 scan0140 | |
| Blueprint graph showing spring poundage selection for 20 HP front and rear axles based on vehicle weight. | 23th Aug 1928 | Box 106 \ 1 scan0141 | |
| Spring chart for the Phantom 'V' Series to F2B models, relating rear and front axle weights to spring poundage. | 23th Aug 1928 | Box 106 \ 1 scan0142 | |
| Retention of a 20 HP car (10-G-3) for comparative springing tests. | 20th Sep 1928 | Box 106 \ 1 scan0143 | |
| Issues with vehicle springing, ride comfort, and weight distribution. | 1st Oct 1928 | Box 106 \ 1 scan0144 | |
| Manufacturing process and design of road springs, including finishing and stamping. | 20th Oct 1928 | Box 106 \ 1 scan0145 | |
| Modifications to the front springs, steering tube, and axle for the India 4 model. | 1st Nov 1928 | Box 106 \ 1 scan0146 | |
| Ordering various poundage road springs for cars designated for the Indian market. | 5th Dec 1928 | Box 106 \ 1 scan0147 | |
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