| Description | Date | Identifier | |
| Performance and wear issues of spring shackles, comparing C.H.N.S. bushes to bronze. | 6th Dec 1922 | Box 54 \ 3 Scan094 | |
| Note about changing the material for front and rear spring fittings from Mild Steel to Ubas for the 40/50HP Chassis. | 28th Dec 1922 | Box 54 \ 3 Scan095 | |
| Results from testing Delage springs and correcting the pitch angle on a worm gear. | 26th Jan 1923 | Box 54 \ 3 Scan096 | |
| From Mr. Royce requesting information and tests on road springs to understand the effects of torsion and side bending. | 27th Jan 1923 | Box 54 \ 3 Scan097 | |
| Technical memorandum discussing the correction and bushing of holes in leaf springs to prevent wear. | 29th Jan 1923 | Box 54 \ 3 Scan098 | |
| Importance of spring alignment to prevent wear and breakage. | 7th Mar 1923 | Box 54 \ 3 Scan099 | |
| Standardisation of a light pressed cover for the central bearing of a rear spring. | 7th Mar 1923 | Box 54 \ 3 Scan100 | |
| Complaint from Springfield regarding knocking in the 40/50 Chassis rear spring roller plates and proposing a reduction of the side clearance limit. | 9th Mar 1923 | Box 54 \ 3 Scan101 | |
| Standardisation of a light pressed cover on the central bearing of the rear spring. | 28th Feb 1923 | Box 54 \ 3 Scan102 | |
| The results of a spring torsion and distortion test. | 17th Mar 1923 | Box 54 \ 3 Scan103 | |
| Data log of a torsion test on a spring, recording torque versus torsion angle. | 17th Mar 1923 | Box 54 \ 3 Scan104 | |
| Spring lateral distortion test report, showing load, angle, and height measurements in a table, with a diagram of the spring. | 24th May 1923 | Box 54 \ 3 Scan105 | |
| Suggestion for fixing the lubricator for the rear spring roller. | 24th May 1923 | Box 54 \ 3 Scan106 | |
| Recommendation to change thick leaf springs to thin ones for cars to be used in Canada due to the risk of breakage. | 9th Sep 1923 | Box 54 \ 3 Scan107 | |
| Increasing the strength of front and rear springs to prevent breakages. | 15th Nov 1923 | Box 54 \ 3 Scan108 | |
| Brake and front suspension issues, and a proposed new scheme for axle control. | 21th Nov 1923 | Box 54 \ 3 Scan109 | |
| Front road springs and steering gear, including breakages and potential modifications. | 30th Nov 1923 | Box 54 \ 3 Scan110 | |
| Potential causes and solutions for front road spring breakages. | 1st Jan 1924 | Box 54 \ 3 Scan111 | |
| Continued note discussing the merits of balloon tyres versus larger wheels. | 25th Jan 1924 | Box 54 \ 3 Scan112 | |
| Policy on changing thick leaf springs to an improved thin leaf type. | 25th Jan 1924 | Box 54 \ 3 Scan113 | |
| The policy for changing thick leaf springs to the thin leaf type in response to customer complaints about squeaking. | 30th Jan 1924 | Box 54 \ 3 Scan114 | |
| The disadvantages of using stiffer front springs on ride quality. | 27th Feb 1924 | Box 54 \ 3 Scan115 | |
| Note on customer acceptance of ride comfort following the addition of front brakes. | 1st Mar 1924 | Box 54 \ 3 Scan116 | |
| Responding to queries about spring standardisation, detailing modifications for front brakes and usage in different countries. | 1st Mar 1924 | Box 54 \ 3 Scan117 | |
| Standardisation of road springs for 40/50 HP and 20 HP models to suit bad roads abroad. | 22th Jan 1924 | Box 54 \ 3 Scan118 | |
| Diagram and table detailing suspension bump clearance measurements. | 7th Mar 1924 | Box 54 \ 3 Scan119 | |
| Bumping test of front springs and rear anchorage, detailing failures of the springs and the frame. | 1st Mar 1924 | Box 54 \ 3 Scan120 | |
| Experimental testing of front axle control systems, proposing a design using semi-elliptic springs and radius rods. | 29th May 1924 | Box 54 \ 3 Scan121 | |
| Telegram received by telephone regarding a car trial and a percentage reduction. | 18th Apr 1924 | Box 54 \ 3 Scan122 | |
| From ROY to Hs. about forwarding a set of Axle Springs to The Dunlop Rubber Co. Ltd. | 18th Jul 1924 | Box 54 \ 3 Scan123 | |
| The internal friction and damping characteristics of Firths and Woodheads road springs. | 8th Jul 1924 | Box 54 \ 3 Scan124 | |
| Requesting load figures for a set of Axle Springs being sent to the Dunlop Company for fitment. | 23th Jul 1924 | Box 54 \ 3 Scan125 | |
| Vehicle spring stiffness and its effect on ride quality for different car bodies. | 1st Aug 1924 | Box 54 \ 3 Scan126 | |
| Stiffness and increased friction in rear springs of the EAC.11 speed model car. | 1st Aug 1924 | Box 54 \ 3 Scan127 | |
| The torsion of deflection of standard, 12½% and 25% type front road springs. | 19th Aug 1924 | Box 54 \ 3 Scan128 | |
| Torsion and oscillation tests conducted on front road springs. | 19th Aug 1924 | Box 54 \ 3 Scan129 | |
| Test report on the torsional deflection of front road springs, detailing the springs used for the tests. | 19th Aug 1924 | Box 54 \ 3 Scan130 | |
| Data table showing torque and pull forces applied to springs at various degrees of twist. | 19th Aug 1924 | Box 54 \ 3 Scan131 | |
| Measurement of friction and nip in road springs for the 46-PK open touring car. | 19th Aug 1924 | Box 54 \ 3 Scan132 | |
| Specification sheet for spring draw on 9-leaf and 10-leaf springs. | 19th Aug 1924 | Box 54 \ 3 Scan133 | |
| Graph showing the load versus deflection test results for an off-side road spring, model 46PK. | 19th Aug 1924 | Box 54 \ 3 Scan134 | |
| Deflection test chart for a near side road spring, model 46PK. | 9th Sep 1924 | Box 54 \ 3 Scan135 | |
| Secret internal memo discussing responsibility for a spring failure and clarifying the roles of the Experimental and Drawing Office departments. | 9th Sep 1924 | Box 54 \ 3 Scan136 | |
| Page 2 of a memo discussing responsibility, efficiency and departmental capability. | 1st Sep 1924 | Box 54 \ 3 Scan137 | |
| Road spring failures and performance during tests in France. | 1st Sep 1924 | Box 54 \ 3 Scan138 | |
| The life and failure rates of various car springs during road and bump tests. | 5th Sep 1924 | Box 54 \ 3 Scan139 | |
| Approximate lifespan of front road springs, suggesting replacement after 50,000 kilometres. | 10th Sep 1924 | Box 54 \ 3 Scan140 | |
| Ordering, design alterations, and required poundages of front springs for Demonstration and Trials cars. | 17th Sep 1924 | Box 54 \ 3 Scan141 | |
| The allocation of 100 pairs of springs and specifications for the top plate. | 17th Sep 1924 | Box 54 \ 3 Scan142 | |
| Chemical analysis report for six road springs marked 1, 2, 3, 4, 5, and 6. | 9th Sep 1924 | Box 54 \ 3 Scan143 | |
| Urgent request for various road springs for experimental and 'Olympia' trials cars. | 9th Sep 1924 | Box 54 \ 3 Scan144 | |
| Requesting fatigue tests on broken spring plates from two different suppliers to determine the best range to resist fatigue. | 25th Sep 1924 | Box 54 \ 3 Scan145 | |
| Query regarding leftover springs following a spring change-over on chassis 18 NK. | 25th Sep 1924 | Box 54 \ 3 Scan146 | |
| The collection of springs for chassis 18-NK. | 26th Sep 1924 | Box 54 \ 3 Scan147 | |
| Defining the new type of front springing and poundages for the 40/50 HP chassis. | 3rd Oct 1924 | Box 54 \ 3 Scan148 | |
| Calculations and fitting procedures for front springs on various car models. | 3rd Oct 1924 | Box 54 \ 3 Scan149 | |
| Specifications for varying spring stiffness and buffers on cars for different countries. | 3rd Oct 1924 | Box 54 \ 3 Scan150 | |
| The Experimental Department's feedback regarding a buffer's effect on ride comfort. | 3rd Oct 1924 | Box 54 \ 3 Scan151 | |
| Querying the correct buffer clearance to be used for different spring types. | 10th Oct 1924 | Box 54 \ 3 Scan152 | |
| Standardisation of front springs for the 40/50 HP chassis. | 6th Oct 1924 | Box 54 \ 3 Scan153 | |
| Secret memorandum regarding the testing of different stiffness car springs in France. | 6th Oct 1924 | Box 54 \ 3 Scan154 | |
| From the Experimental Department seeking instructions on which springs to fit to cars 9-PK and 98-NK for testing in France. | 10th Oct 1924 | Box 54 \ 3 Scan155 | |
| Standardisation of 40/50 HP road springs and fittings. | 10th Oct 1924 | Box 54 \ 3 Scan156 | |
| Standardisation of chassis parts for front springs, brackets, and shackles to suit front wheel brakes. | 12th May 1924 | Box 54 \ 3 Scan157 | |
| Fitting stiffer springs to Press Demonstration cars and future plans for car 48-PK. | 10th Oct 1924 | Box 54 \ 3 Scan158 | |
| Testing road springs in France, comparing different stiffness levels and makes. | 9th Oct 1924 | Box 54 \ 3 Scan159 | |
| Bump tests on road springs and proposing a new apparatus for continuous bending tests. | 10th Oct 1924 | Box 54 \ 3 Scan160 | |
| Testing and comparison of Firth and Woodhead front springs. | 16th Oct 1924 | Box 54 \ 3 Scan161 | |
| Telegram received by telephone enquiring about the current status of front spring testing. | 17th Oct 1924 | Box 54 \ 3 Scan162 | |
| Telegram received by telephone from Johnson regarding production, tests, and vehicle specifications. | 23th Aug 1925 | Box 54 \ 3 Scan163 | |
| Query regarding the collection of springs for Chassis 18 NK. | 20th Oct 1924 | Box 54 \ 3 Scan164 | |
| Breakage of front road springs and proposing design modifications to improve their lifespan. | 21th Oct 1924 | Box 54 \ 3 Scan165 | |
| Complaint about cars bumping on rubber buffers and the design considerations for front spring clearance. | 20th Nov 1924 | Box 54 \ 3 Scan166 | |
| Comparison of buffer clearance between the 40/50 HP and EAC.111 car models. | 20th Nov 1924 | Box 54 \ 3 Scan167 | |
| Comparison of buffer clearance specifications for the standard 40/50 HP chassis and the EAC.111 chassis. | 20th Nov 1924 | Box 54 \ 3 Scan168 | |
| Hand-drawn sketch with calculations showing the buffer clearance for a 40/50 HP chassis. | 20th Nov 1924 | Box 54 \ 3 Scan169 | |
| Testing different types of car springs to address squeaking issues. | 29th Dec 1924 | Box 54 \ 3 Scan170 | |
| Recommendation for Woodheads springs fitted with 'Alf's Button' with specified poundages. | 31th Dec 1924 | Box 54 \ 3 Scan171 | |
| Request to pack up and return experimental parts and springs for chassis 18-NK from Cricklewood to Derby. | 1st Jan 1925 | Box 54 \ 3 Scan172 | |
| The collection or return of springs for chassis 80 NK. | 2nd Jan 1925 | Box 54 \ 3 Scan173 | |
| Querying the return of 6 Road Springs to settle an amount of credit. | 22th Jan 1925 | Box 54 \ 3 Scan174 | |
| Experimental springs for chassis 18-NK, clarifying their status and value as scrap. | 28th Jan 1925 | Box 54 \ 3 Scan175 | |
| Comparing the suspension and ride comfort of the Phantom and pre-front brake Silver Ghost models. | 1st Apr 1926 | Box 54 \ 3 Scan176 | |
| Internal order for Ferodo spring interleaving material for front and rear springs. | 27th Apr 1925 | Box 54 \ 3 Scan177 | |
| Internal query about past experiments with under-slung semi-elliptic springs versus the cantilever suspension system on the 40/50-HP model. | 12th Jun 1925 | Box 54 \ 3 Scan178 | |
| Confidential memo on the intention to change from cantilever to under-slung semi-elliptic springs for the 40/50 model. | 15th Jun 1925 | Box 54 \ 3 Scan179 | |
| The unsatisfactory progress of Dunlop Company's experiments with interleaving axle springs. | 6th Jul 1925 | Box 54 \ 3 Scan180 | |
| Springing demonstration to investigate suspension complaints and ride quality on the Phantom model. | 26th Mar 1926 | Box 54 \ 3 Scan181 | |
| Tests on shock dampers and tyre pressures to address a riding complaint in various car models. | 13th Apr 1926 | Box 54 \ 3 Scan182 | |
| From D.A. to H.s. discussing the results of suspension tests comparing a pre 'U' series Silver Ghost with a New Phantom. | 13th Apr 1926 | Box 54 \ 3 Scan183 | |
| Phantom suspension tests, concluding that spring friction is the primary cause of jolting. | 15th Apr 1926 | Box 54 \ 3 Scan184 | |
| The effect of fitting front wheel brakes on the springing and ride quality of the Phantom and Silver Ghost models. | 15th Apr 1926 | Box 54 \ 3 Scan185 | |
| Internal memorandum discussing springing complaints and ride comfort on the Silver Ghost, Phantom, and 20 HP models. | 10th Aug 1926 | Box 54 \ 3 Scan186 | |
| Comparison between reversed leaf springs on Lancias and rebound leaf springs on Bentleys, discussing friction, life, and performance. | 10th Aug 1926 | Box 54 \ 3 Scan187 | |
| Graph showing deflection versus total spring load for Lancia 3-leaf reversed leaf springs. | 10th Aug 1926 | Box 54 \ 3 Scan188 | |
| Graph plotting compression vs total load for a Woodhead Special Spring D, detailing loading and unloading performance. | 28th Feb 1927 | Box 54 \ 3 Scan189 | |
| Investigation into buffer clearance and performance issues with 20% stiffer rear springs for Continentally sprung cars. | 28th Feb 1927 | Box 54 \ 3 Scan190 | |
| Technical memo discussing the negative impacts of fitting stiffer springs to cars, noting the risk of broken frames and worsened ride quality. | 1st Mar 1927 | Box 54 \ 3 Scan191 | |
| Comparing different types of steel used for road spring materials by various suppliers. | 1st Mar 1927 | Box 54 \ 3 Scan192 | |
| Specification chart for Silico Manganese steel from Jonas Woodhead & Sons Ltd. | 2nd Mar 1927 | Box 54 \ 3 Scan193 | |
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