| Description | Date | Identifier | |
| 'jaggering' issue when braking, comparing torque tube and parallel axle control systems, and suggesting a driving technique to mitigate it. | 9th Mar 1920 | Box 80 \ 2 scan0095 | |
| Forwarding a copy of another memo and photographs regarding 3X Springs. | 3rd Mar 1920 | Box 80 \ 2 scan0096 | |
| Photographic evidence from a road test concerning 3X springs, focusing on braking, skidding, and bumping at 55 MPH. | 6th Aug 1919 | Box 80 \ 2 scan0097 | |
| Record of bump test measurements taken at speeds of 55 MPH and approximately 50 MPH. | 1st Mar 1920 | Box 80 \ 2 scan0098 | |
| Necessity of greasing thick leaf rear springs to prevent squeaking. | 1st Mar 1920 | Box 80 \ 2 scan0099 | |
| Letter discussing the difficulty of greasing rear springs and suggesting improved tools for the task. | 11th Mar 1920 | Box 80 \ 2 scan0100 | |
| The procedure for greasing springs and the inadequacy of the supplied toolkit. | 15th Mar 1920 | Box 80 \ 2 scan0101 | |
| Requesting information on a broken leaf spring for car 26CW. | 16th Mar 1920 | Box 80 \ 2 scan0102 | |
| Broken thick leaf rear spring on a car in Spain, including a telegram and analysis of bump test failures. | 16th Mar 1920 | Box 80 \ 2 scan0103 | |
| Bumping test results, identifying the rear springs as the weakest component and the steel material as unsatisfactory. | 16th Mar 1920 | Box 80 \ 2 scan0104 | |
| Failures of rear springs during a bump test. | 16th Mar 1920 | Box 80 \ 2 scan0105 | |
| Cover memo from C.J. distributing a memorandum from Mr. Royce regarding the chassis. | 8th Mar 1920 | Box 80 \ 2 scan0106 | |
| Responding to criticism about chassis design, clarifying it is not a racing machine and discussing weight distribution. | 16th Mar 1920 | Box 80 \ 2 scan0107 | |
| Extract listing four urgent design issues (slipper drive, steering, piston knocks, dynamo noise) that cause production delays. | 26th Mar 1920 | Box 80 \ 2 scan0108 | |
| Extracts from a report on chassis No. 713, detailing springing maintenance, mileage, and fuel consumption records. | 7th Apr 1920 | Box 80 \ 2 scan0109 | |
| Bumping rig tests of split rear springs fitted with extra clips to see if their life could be increased. | 12th Apr 1920 | Box 80 \ 2 scan0110 | |
| The unreliability of present rear springs, recommending a return to the pre-war design and to stop new orders for America. | 12th Apr 1920 | Box 80 \ 2 scan0111 | |
| Potential experiments and improvements to the steering system, referencing Mr. Horlick's feedback. | 12th Apr 1920 | Box 80 \ 2 scan0112 | |
| List of instructions for adjusting the front axle, springs, and steering components. | 12th Apr 1920 | Box 80 \ 2 scan0113 | |
| Issues with rear springs breaking and the need to revert to a pre-war spring design. | 13th Apr 1920 | Box 80 \ 2 scan0114 | |
| New design for rear springs to be made with thinned ends and Ferodo strips to prevent wear and squeaking. | 14th Apr 1920 | Box 80 \ 2 scan0115 | |
| From CJ to Hs enquiring about the testing procedures for rear springs. | 14th Apr 1920 | Box 80 \ 2 scan0116 | |
| The unsatisfactory nature of current rear springs and the policy for supplying spares. | 14th Apr 1920 | Box 80 \ 2 scan0117 | |
| Specifications for special rear springs for the Open Trials Car 19-LW. | 17th Apr 1920 | Box 80 \ 2 scan0118 | |
| Letter regarding a spring squeaking issue on the 19-LW Open Trials Car and arrangements for its repair. | 17th Apr 1920 | Box 80 \ 2 scan0119 | |
| Manufacturing defects found in road springs. | 19th Apr 1920 | Box 80 \ 2 scan0120 | |
| Modifications to springs and clips to prevent plates from turning. | 19th Apr 1920 | Box 80 \ 2 scan0121 | |
| Different designs of road springs for testing. | 19th Apr 1920 | Box 80 \ 2 scan0122 | |
| Proposal to revert to a pre-war type of rear spring for the chassis, and the plan to approach the supplier, Messrs. Woodheads. | 21th Apr 1920 | Box 80 \ 2 scan0123 | |
| Design of rear springs, condemning the split leaf concept and suggesting a return to older practices. | 21th Apr 1920 | Box 80 \ 2 scan0124 | |
| Technical note advising on modifications to leaf springs to prevent failure during rough Continental service. | 21th Apr 1920 | Box 80 \ 2 scan0125 | |
| Complaints about an Open Trials Car, including rear spring issues and a rough engine. | 21th Apr 1920 | Box 80 \ 2 scan0126 | |
| Quality of chassis rear springs and the intention to work with Messrs Woodhead on an improvement. | 26th Apr 1920 | Box 80 \ 2 scan0127 | |
| Test report for a rear bumper, detailing spring failures and Brinell hardness testing of leaves. | 24th Jul 1920 | Box 80 \ 2 scan0128 | |
| Continuation of a bumper test, showing Brinell hardness test results for the leaves of a spring. | 29th Apr 1920 | Box 80 \ 2 scan0129 | |
| Letter to Messrs. Jonas Woodhead & Sons Ltd. confirming decisions about modifications to rear springs. | 29th Apr 1920 | Box 80 \ 2 scan0130 | |
| Modifications to front and rear spring plates, including curvature, grinding and assembly methods. | 29th Apr 1920 | Box 80 \ 2 scan0131 | |
| Leaf spring design modifications, clips, and supply arrangements for production chassis. | 29th Apr 1920 | Box 80 \ 2 scan0132 | |
| Correspondence regarding an offer from Mr Alfred Woodhead to produce 400 pairs of rear spring main plates with solid eyes. | 29th Apr 1920 | Box 80 \ 2 scan0133 | |
| Testing Ferodo bedding between the leaves of road springs. | 28th Apr 1920 | Box 80 \ 2 scan0134 | |
| Requesting clarification on instructions regarding alterations and issues with rear springs. | 28th Apr 1920 | Box 80 \ 2 scan0135 | |
| Broken spring roller from Mr. Gibbs' Car 35.LW for investigation. | 29th Apr 1920 | Box 80 \ 2 scan0136 | |
| Design of new rear springs and a meeting with the supplier, Mr Woodhead. | 30th Apr 1920 | Box 80 \ 2 scan0137 | |
| Technical report discussing the performance of a spring clip and suggesting design modifications. | 1st Apr 1920 | Box 80 \ 2 scan0138 | |
| Spring plate modifications, clips, and reasons for breakages, with suggestions for improvements. | 30th Apr 1920 | Box 80 \ 2 scan0139 | |
| The issue of front springs and preparing a drawing. | 30th Apr 1920 | Box 80 \ 2 scan0140 | |
| Proposed new rear spring designs ('N' Scheme 333) and manufacturing discussions. | 3rd May 1920 | Box 80 \ 2 scan0141 | |
| Technical analysis of spring plate and clip design, discussing forces, wear, and potential improvements. | 3rd May 1920 | Box 80 \ 2 scan0142 | |
| The design of spring clips and plates to resist sideways forces. | 1st May 1920 | Box 80 \ 2 scan0143 | |
| Design and implementation of spring clips for a chassis. | 3rd May 1920 | Box 80 \ 2 scan0144 | |
| Fitting shock absorbers and non-split rear springs to the American Trials Car chassis, 22-LW. | 4th May 1920 | Box 80 \ 2 scan0145 | |
| Design improvements for rear road springs, focusing on plates and clips. | 6th May 1920 | Box 80 \ 2 scan0146 | |
| Announcing that new forged chassis rear springs, with pegs and slots deleted, are now available from the Stores. | 8th May 1920 | Box 80 \ 2 scan0147 | |
| Letter about unsafe alterations made to a car chassis and deciding on the necessary action. | 11th May 1920 | Box 80 \ 2 scan0148 | |
| Letter from an Engineer and Carriage Builder detailing modifications made to chassis, including replacing bronze trunnions with steel ones. | 4th May 1920 | Box 80 \ 2 scan0149 | |
| Page 2 of a letter discussing fitting new bodies to chassis, conversions, and the suitability of cantilever springs. | 4th May 1920 | Box 80 \ 2 scan0150 | |
| The concluding page of a letter signed by J.J. Gill. | 4th May 1920 | Box 80 \ 2 scan0151 | |
| Telephone conversation about the delivery of chassis rear springs. | 5th May 1920 | Box 80 \ 2 scan0152 | |
| Proposal to fit heavier springs to Australian chassis. | 17th May 1920 | Box 80 \ 2 scan0153 | |
| Suggesting T.H. Gill acquire certain fittings for them to be tested on the bump test. | 17th May 1920 | Box 80 \ 2 scan0154 | |
| Forgings, rear road springs, and front shock absorber anchorage for the 40/50 HP chassis. | 18th May 1920 | Box 80 \ 2 scan0155 | |
| Issues and potential modifications for chassis rear springs, including squeaking. | 20th May 1920 | Box 80 \ 2 scan0156 | |
| Reporting on the bumping rig test of road springs received from Messrs. Woodhead. | 21th May 1920 | Box 80 \ 2 scan0157 | |
| Confirmation of a telegram sent to Messrs Jonas Woodhead regarding a new spring design and production. | 21th May 1920 | Box 80 \ 2 scan0158 | |
| Follow-up memo regarding the supply of non-split type rear springs for PN's trials car 19-LW. | 27th May 1920 | Box 80 \ 2 scan0159 | |
| Recommendation to modify the rear springs to increase clearance for the shock absorbers. | 28th May 1920 | Box 80 \ 2 scan0160 | |
| Rear leaf spring design, friction, and the fitting of a luggage grid. | 31th May 1920 | Box 80 \ 2 scan0161 | |
| Use of Ferodo and alternative materials like sheet brass to prevent seizure. | 31th May 1920 | Box 80 \ 2 scan0162 | |
| Log sheet detailing the results of a bumper test on a chassis, tracking hours run and component failures. | 2nd Jun 1920 | Box 80 \ 2 scan0163 | |
| Complaints of chassis rattles caused by excessive end play in spring shackles and supports. | 1st Jun 1920 | Box 80 \ 2 scan0164 | |
| The breakage of a front spring on a Demonstration Class Car after 35,000 miles. | 5th Jun 1923 | Box 80 \ 2 scan0165 | |
| The testing of different types of rear springs and an analysis of fractures observed on a bumping rig. | 1st Jun 1920 | Box 80 \ 2 scan0166 | |
| Continued technical note regarding stress on plates which break. | 10th Jun 1920 | Box 80 \ 2 scan0167 | |
| Mathematical investigation into rear road spring failures and design improvements. | 11th Jun 1920 | Box 80 \ 2 scan0168 | |
| Incorrectly manufactured chassis rear springs and requesting a new order to fix a squeaking issue. | 14th Jun 1920 | Box 80 \ 2 scan0169 | |
| Suggestions for re-lubricating chassis rear spring interleaving material using graphite. | 16th Jun 1920 | Box 80 \ 2 scan0170 | |
| Performance and potential improvements of shock dampers. | 22th Jun 1920 | Box 80 \ 2 scan0171 | |
| Test report detailing the results of a bumper and 12-leaf spring durability trial, including Brinell hardness tests on the broken spring. | 1st Jul 1920 | Box 80 \ 2 scan0172 | |
| Chassis failures during a bump test after switching from split springs to solid leaf springs. | 28th Jun 1920 | Box 80 \ 2 scan0173 | |
| Investigation into the design and performance of rear road springs, noting issues with plate thickness and stress distribution. | 30th Jun 1920 | Box 80 \ 2 scan0174 | |
| Continuation of a report on the analysis of leaf spring characteristics and performance. | 30th Jun 1920 | Box 80 \ 2 scan0175 | |
| Letter to T. Firth & Sons, Ltd. regarding the design specifications and finish of road springs. | 2nd Jul 1920 | Box 80 \ 2 scan0176 | |
| From F.H. Royce discussing the design of spring eyes, lubrication, and bushes. | 2nd Jul 1920 | Box 80 \ 2 scan0177 | |
| Continued list of notes and feedback on various vehicle components including steering, axle, suspension, body, and floorboards. | 17th Jul 1920 | Box 80 \ 2 scan0178 | |
| Potential modifications to suspension springs, including split leaves and under-axle mounting. | 21th Jul 1920 | Box 80 \ 2 scan0179 | |
| Log from a Bumper Test detailing failures of spring and shock absorber components. | 7th Aug 1920 | Box 80 \ 2 scan0180 | |
| Test report on a leaf spring's durability, noting material hardness and failure points over time. | 30th Jul 1920 | Box 80 \ 2 scan0181 | |
| Test report for Spring F.363, detailing Brinell hardness and run time results for 6 leaves. | 2nd Aug 1920 | Box 80 \ 2 scan0182 | |
| Recommendation to use pre-war rear springs for American chassis due to their durability and superior performance on rough roads. | 30th Jul 1920 | Box 80 \ 2 scan0183 | |
| Ride comfort differences between split leaf and solid leaf springs on a 40/50 chassis. | 30th Jul 1920 | Box 80 \ 2 scan0184 | |
| Straight-sided Dunlop tyres discussing issues with high pressure, ride comfort, and road handling. | 30th Jul 1920 | Box 80 \ 2 scan0185 | |
| Reporting on comparative tests of various rear spring designs. | 31th Jul 1920 | Box 80 \ 2 scan0186 | |
| Rear leaf spring design, bump testing, and the use of Ferodo interleaving material to prevent squeaking. | 31th Jul 1920 | Box 80 \ 2 scan0187 | |
| Continued discussion on fitting rear springs with known faults, while awaiting better experimental results. | 31th Jul 1920 | Box 80 \ 2 scan0188 | |
| Test results from a bumping rig comparing different types of rear springs based on hours run until fracture. | 19th Feb 1920 | Box 80 \ 2 scan0189 | |
| Test report on two SPRING F.363 leaf springs, detailing wear, cracks, and breakages after a time run. | 19th Feb 1920 | Box 80 \ 2 scan0190 | |
| The proposal to modify chassis front springs by removing nibs and slots. | 8th Aug 1920 | Box 80 \ 2 scan0191 | |
| Inspection report detailing the condition of a 9-leaf spring after a test run, including specifications and test results. | 18th Aug 1920 | Box 80 \ 2 scan0192 | |
| Test report for a 9-leaf parallel spring, detailing cracks and breaks after a runtime test. | 19th Aug 1920 | Box 80 \ 2 scan0193 | |
| Directive to stop ordering the current packing for rear spring centre bracket F.6779 and to replace it with aluminium packing. | 19th Aug 1920 | Box 80 \ 2 scan0194 | |
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