| Description | Date | Identifier | |
| Design alteration for the rear anchorage of the front spring to accommodate a drip plug for the centralised chassis lubrication system. | 17th May 1928 | Box 16 \ 7 Scan065 | |
| Sending a new spring damped pendulum lever and other design improvements for the SS. Phantom model. | 7th May 1928 | Box 16 \ 7 Scan066 | |
| Recommendations to improve the high-speed performance of the 40/50 suspension system. | 19th May 1928 | Box 16 \ 7 Scan067 | |
| Page of notes on supplementing damping with Hartfords and adjusting steering pivot lean. | 21th May 1928 | Box 16 \ 7 Scan068 | |
| Suspension spring deflection, buffer clearance, and camber for models EAC.7 and EAC.10. | 21th May 1928 | Box 16 \ 7 Scan069 | |
| Excessive rear wing clearance on the 14-EX car, creating a misleading appearance. | 23th May 1928 | Box 16 \ 7 Scan070 | |
| Frame heights for EAC.10 and questioning buffer clearances for springs. | 31th May 1928 | Box 16 \ 7 Scan071 | |
| Blueprint comparing the frame heights for three different 40/50 chassis models. | 31th May 1928 | Box 16 \ 7 Scan072 | |
| Print room stamp from the Derby facility. | 31th May 1928 | Box 16 \ 7 Scan073 | |
| The testing and performance of cadmium-plated road springs. | 26th Jun 1928 | Box 16 \ 7 Scan074 | |
| Laboratory report detailing the hardness test results for broken spring plates. | 4th Jul 1928 | Box 16 \ 7 Scan075 | |
| Typed internal memo providing feedback and criticisms on various car models and their performance. | 9th Jul 1928 | Box 16 \ 7 Scan076 | |
| Riding qualities of the Phantom and 20 HP models, focusing on tyres and road springs. | 20th Jul 1928 | Box 16 \ 7 Scan077 | |
| Improving vehicle ride quality by adjusting flexible springs and hydraulic shock dampers. | 24th Jul 1928 | Box 16 \ 7 Scan078 | |
| The correct road spring specifications for the 17-EX car and sourcing logistics. | 24th Jul 1928 | Box 16 \ 7 Scan079 | |
| Recommendation for using 25% stiffer springs on heavily sprung cars for specific conditions. | 26th Jul 1928 | Box 16 \ 7 Scan080 | |
| Customer complaints and tests related to vehicle springing, specifically for the Phantom and 20 HP models. | 27th Jul 1928 | Box 16 \ 7 Scan081 | |
| Commenting on the design and manufacturing of road springs, comparing different types. | 14th Aug 1928 | Box 16 \ 7 Scan082 | |
| Comparing the quality and cost of Firth springs versus Lemoine and American springs. | 20th Aug 1928 | Box 16 \ 7 Scan083 | |
| Query about the arrival of stiffer rear road springs for the 12-EX and 17-EX models. | 20th Aug 1928 | Box 16 \ 7 Scan084 | |
| Concerns regarding a new design for 40/50 rear road springs and centrepoint lubrication. | 3rd Mar 1928 | Box 16 \ 7 Scan085 | |
| Requesting data on suspension buffer deflection during a 10,000-mile test of 20 HP and 40/50 HP models. | 23th Aug 1928 | Box 16 \ 7 Scan086 | |
| Test results for buffer penetration and wheel arch clearance for different tyre sizes. | 1st Aug 1928 | Box 16 \ 7 Scan087 | |
| New type rear springs be cadmium plated before fitting. | 8th Aug 1928 | Box 16 \ 7 Scan088 | |
| New scheme for rear spring lubrication, requesting a pair of standard springs to be cadmium plated. | 27th Aug 1928 | Box 16 \ 7 Scan089 | |
| Car springing guidelines and qualifications for various car models. | 27th Aug 1928 | Box 16 \ 7 Scan090 | |
| Continued page discussing front spring specifications and recommendations for different driving conditions. | 27th Aug 1928 | Box 16 \ 7 Scan091 | |
| Two graphs showing spring poundage against axle weight for 20 HP rear and front springs. | 30th Aug 1928 | Box 16 \ 7 Scan092 | |
| Blank document page marked with a 'Print Room' receiving stamp. | 30th Aug 1928 | Box 16 \ 7 Scan093 | |
| Spring chart for Phantom 'V' series to F2B, detailing spring poundage against front and rear axle weight. | 23th Aug 1928 | Box 16 \ 7 Scan094 | |
| Blank page with a 'Print Room' stamp from Derby. | 30th Aug 1928 | Box 16 \ 7 Scan095 | |
| Notice about altering the front axle inclination for the Phantom 'G2A' series chassis and onwards. | 28th Aug 1928 | Box 16 \ 7 Scan096 | |
| Request to inspect the plating on one cadmium-plated front spring and to measure the internal friction of another. | 5th Sep 1928 | Box 16 \ 7 Scan097 | |
| The buffer clearance for new 25% stiffer rear springs. | 6th Sep 1928 | Box 16 \ 7 Scan098 | |
| Specification sheet comparing front and rear road springs for 'Sports' and 'Chassis' models. | 6th Sep 1928 | Box 16 \ 7 Scan099 | |
| Buffer clearance specifications for different car springs and driving conditions. | 1st Sep 1928 | Box 16 \ 7 Scan100 | |
| The arrangement of the 'SS' front rubber buffer. | 12th Sep 1923 | Box 16 \ 7 Scan101 | |
| The provision of a sliding pad for Phantom rear springs. | 13th Sep 1928 | Box 16 \ 7 Scan102 | |
| Explaining discrepancies between two suspension tests for the 40/50 model. | 17th Sep 1928 | Box 16 \ 7 Scan103 | |
| Changes to the rear springs and fittings for the 12-EX & Phantom models under scheme H 2709. | 21th Sep 1928 | Box 16 \ 7 Scan104 | |
| Requesting confirmation that part N.sch.2709 is fitted to a 12-EX car to enable standard rear springs to be fitted. | 21th Sep 1928 | Box 16 \ 7 Scan105 | |
| Recommendation for ordering 1400, 1300 and 1200 lbs rear springs for the 18-EX model. | 24th Sep 1928 | Box 16 \ 7 Scan106 | |
| Instruction to fit 1500 lbs. 6-leaf 25% stiffer springs from car 12-EX to car 17-EX. | 25th Sep 1928 | Box 16 \ 7 Scan107 | |
| Request to cadmium plate and re-fit the 1600 lbs rear springs for the 10-EX car. | 25th Sep 1928 | Box 16 \ 7 Scan108 | |
| Recommendation to order 'SS' front road springs of 1050, 1100 and 1150 lbs. | 26th Sep 1928 | Box 16 \ 7 Scan109 | |
| Vehicle springing, ride comfort, weight distribution, and tyre selection for various car models. | 1st Oct 1928 | Box 16 \ 7 Scan110 | |
| Design of road spring plates, comparing square ends to pointed ends and cantilever to semi-elliptic springs. | 10th Feb 1928 | Box 16 \ 7 Scan111 | |
| Standardisation of cadmium plating on road springs and modifications for leaf bedding. | 1st Oct 1928 | Box 16 \ 7 Scan112 | |
| Requesting a 40/50 rear engine rubber mounting foot for testing and a change of front springs on the 8-EX car. | 17th Oct 1928 | Box 16 \ 7 Scan113 | |
| Impact of rear body length and weight distribution on car riding qualities. | 20th Oct 1928 | Box 16 \ 7 Scan114 | |
| Manufacturing process and design of road springs. | 20th Oct 1928 | Box 16 \ 7 Scan115 | |
| Recommending 1500 lbs. rear springs be made available for 'SS' bodies due to the addition of subframes. | 31th Oct 1928 | Box 16 \ 7 Scan116 | |
| Persistent squeaks from the front road springs and proposing design alterations. | 1st Dec 1928 | Box 16 \ 7 Scan117 | |
| Diagram illustrating the lubrication of a flexible cable spring. | 30th Nov 1928 | Box 16 \ 7 Scan118 | |
| Blueprint detailing the rear anchorage assembly for a front spring. | 30th Nov 1928 | Box 16 \ 7 Scan119 | |
| Internal memorandum confirming previous results on car springing. | 6th Dec 1928 | Box 16 \ 7 Scan120 | |
| Request to obtain 12 top plates for 'SS' front springs to replace broken ones from the bump rig. | 6th Dec 1928 | Box 16 \ 7 Scan121 | |
| Short internal memo confirming agreement with a report regarding springing. | 7th Dec 1928 | Box 16 \ 7 Scan122 | |
| Instruction to order 12 top plates for S.S. front springs to replace breakages occurring on the bumping rig. | 7th Dec 1928 | Box 16 \ 7 Scan123 | |
| Specifying the correct front and rear springs for models 14-G-1V and 19-EX, including a note on cadmium plating. | 10th Dec 1928 | Box 16 \ 7 Scan124 | |
| Order for 'SS' springs of various weights. | 10th Dec 1928 | Box 16 \ 7 Scan125 | |
| Potential improvements for the 'SS' model's spring lubrication system. | 11th Dec 1928 | Box 16 \ 7 Scan126 | |
| Technical memorandum discussing experiments and methods for improving the lubrication of 'SS' front springs. | 20th Dec 1928 | Box 16 \ 7 Scan127 | |
| Continued note on the beneficial effect of radius rod action on the spring during front brake application. | 13th Dec 1928 | Box 16 \ 7 Scan128 | |
| Confirming that the 'SS' spring lubrication will be the next job for the first chassis. | 13th Dec 1928 | Box 16 \ 7 Scan129 | |
| Length of the 'SS' chassis, comparing it to competitors and suggesting design improvements. | 26th Dec 1928 | Box 16 \ 7 Scan130 | |
| Chassis design, dimensions, and comparisons with the Phantom model. | 21th Dec 1928 | Box 16 \ 7 Scan131 | |
| Continued page of a typed letter or memorandum discussing a particular subject. | 1st Jan 1929 | Box 16 \ 7 Scan132 | |
| Explaining the difference in stress range and life between front and rear road springs. | 1st Jan 1929 | Box 16 \ 7 Scan133 | |
| The 'SS' bumper chassis testing on the bumping rig, discussing front spring life and new hydraulic shock dampers. | 1st Jan 1929 | Box 16 \ 7 Scan134 | |
| Analysis of failures during a 200-hour bumping rig test on an 'SS' chassis. | 1st Jan 1929 | Box 16 \ 7 Scan135 | |
| Test report logging the operational lives and failure times of various components like levers, shafts, and casings. | 1st Jan 1929 | Box 16 \ 7 Scan136 | |
| Testing of rear shock absorbers, including conditions and failures over time. | 1st Jan 1929 | Box 16 \ 7 Scan137 | |
| Log of spring testing, detailing life, running conditions, and failure points. | 11th Jan 1925 | Box 16 \ 7 Scan138 | |
| Drawing and failure analysis of a rear shock absorber piston which broke after 45 minutes of running. | 11th Jan 1925 | Box 16 \ 7 Scan139 | |
| Blueprint diagram of an Axle Control Damper Casing, noting a failure point from a test run. | 11th Jan 1928 | Box 16 \ 7 Scan140 | |
| Blueprint showing a fracture on a front spring clip after a timed test run. | 11th Jan 1929 | Box 16 \ 7 Scan141 | |
| Diagram showing the failure points of a bracket on a steering column after a timed run. | 11th Jan 1929 | Box 16 \ 7 Scan142 | |
| Specifying the standard poundages for 'SS' road springs and a special type for light cars. | 21th Jan 1929 | Box 16 \ 7 Scan143 | |
| Suggestion for a centralised spring lubrication system and recommending it be patented. | 23th Jan 1929 | Box 16 \ 7 Scan144 | |
| Specifying the required weight for 'SS' road springs for maximum type bodies. | 29th Jan 1929 | Box 16 \ 7 Scan145 | |
| Design of the rear spring front anchorage, referencing a drawing and questioning differences compared to front springs. | 1st Jan 1929 | Box 16 \ 7 Scan146 | |
| Testing procedures for lubricated road springs on the 20-EX model. | 30th Jan 1929 | Box 16 \ 7 Scan147 | |
| Blueprint diagram for a spring lubrication system. | 30th Jan 1929 | Box 16 \ 7 Scan148 | |
| Almost entirely illegible document featuring only a purple ink stamp. | 30th Jan 1929 | Box 16 \ 7 Scan149 | |
| Secret internal memorandum discussing issues with front spring anchorage, lubrication, and pendulum lever wear. | 30th Jan 1929 | Box 16 \ 7 Scan150 | |
| Communication discussing issues with pipe joints and suggestions for protecting overflow pipes from mud. | 25th Jan 1929 | Box 16 \ 7 Scan151 | |
| Internal memorandum regarding 'SS' Spring Lubrication experiments and instructing parts for a car going to France. | 1st Feb 1928 | Box 16 \ 7 Scan152 | |
| Lubrication test for 'SS' road springs, proposing a 10,000-mile trial on a vehicle. | 1st Feb 1929 | Box 16 \ 7 Scan153 | |
| The poundage specifications for J.2. Series road springs. | 6th Feb 1929 | Box 16 \ 7 Scan154 | |
| Modified allocation of S.S. springs to be sent to Messrs. Firths. | 8th Feb 1929 | Box 16 \ 7 Scan155 | |
| Table of weights for front and rear road springs for a Super-Sports model. | 19th Feb 1929 | Box 16 \ 7 Scan156 | |
| Elimination of special springing provisions for the Continent and Australia. | 19th Feb 1929 | Box 16 \ 7 Scan157 | |
| Springing poundages for the 'SS' and 20 HP models. | 22th Feb 1929 | Box 16 \ 7 Scan158 | |
| Modifications to the lubrication of spring gaiters on the Phantom model. | 2nd Mar 1929 | Box 16 \ 7 Scan159 | |
| Interpreting a telegram regarding feedback on a car's performance, detailing required modifications to springs, dampers, and other components. | 22th Mar 1929 | Box 16 \ 7 Scan160 | |
| Phantom road spring lubrication issues and a proposed solution using an Enots gun. | 26th Mar 1929 | Box 16 \ 7 Scan161 | |
| Manufacturing and supply of S.S. springs for the first 50 SS chassis. | 9th Apr 1929 | Box 16 \ 7 Scan162 | |
| The 'S.S' model's rear spring clip fouling the subframe and a proposed solution. | 9th Apr 1929 | Box 16 \ 7 Scan163 | |
| Lubrication system for road springs. | 9th Apr 1929 | Box 16 \ 7 Scan164 | |
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