| Description | Date | Identifier | |
| Test log for a rear axle on a bumper test, detailing component failures and replacements. | 28th Jun 1920 | Box 80 \ 2 scan0295 | |
| Rear axle bumper test results and subsequent Brinell tests on various leaf springs. | 14th Jun 1920 | Box 80 \ 2 scan0296 | |
| Continuation of Brinell hardness test results for various spring leaves under different loads. | 19th Jul 1917 | Box 80 \ 2 scan0297 | |
| The testing of chassis springs without nibs and slots, noting their breakage is not solely related to a low Brinell figure. | 23th Jun 1920 | Box 80 \ 2 scan0298 | |
| Brinell hardness tests conducted on various chassis springs. | 19th Jul 1917 | Box 80 \ 2 scan0299 | |
| The Brinell hardness test results for a chassis spring. | 28th Jun 1920 | Box 80 \ 2 scan0300 | |
| List of experimental parts fitted to the 6.EX Car in response to a telegram. | 28th Jun 1920 | Box 80 \ 2 scan0301 | |
| Bumper test report detailing failures over time and subsequent Brinell hardness tests on a broken spring. | 1st Jul 1920 | Box 80 \ 2 scan0302 | |
| Letter to T. Firth & Sons discussing the removal of 'nib and slot' features and the required finish on road springs. | 2nd Jul 1920 | Box 80 \ 2 scan0303 | |
| Design of solid spring eyes, lubrication, and future improvements. | 1st Jul 1920 | Box 80 \ 2 scan0304 | |
| Extract detailing feedback on chassis components including springs, steering, body, and floorboards. | 17th Jul 1920 | Box 80 \ 2 scan0305 | |
| Request from Mr. Royce to modify the road springs on chassis 6.EX with Ferodo to fix poor ride quality and lack of damping. | 22th Jul 1920 | Box 80 \ 2 scan0306 | |
| Rear bumper test report detailing daily spring failures and Brinell hardness results of the leaves. | 24th Jul 1920 | Box 80 \ 2 scan0307 | |
| Test report detailing the results of a bumper and Brinell test on a spring. | 24th Mar 1920 | Box 80 \ 2 scan0308 | |
| Log sheet detailing a bumper test, recording failures and replacements of springs and shock absorbers. | 29th Jul 1920 | Box 80 \ 2 scan0309 | |
| Test report for Spring F.363, detailing results of timed endurance testing on its six leaves. | 28th Jul 1920 | Box 80 \ 2 scan0310 | |
| Test report on a spring, detailing its condition and Brinell hardness after a timed run. | 2nd Aug 1920 | Box 80 \ 2 scan0311 | |
| Springing of a 40/50 chassis, comparing split leaf and solid leaf springs and the effect of tyre pressures. | 30th Jul 1920 | Box 80 \ 2 scan0312 | |
| Road testing Dunlop tyres and the effects of pressure on ride comfort and grip. | 30th Jul 1920 | Box 80 \ 2 scan0313 | |
| Comparative strength and performance tests on three types of rear springs. | 31th Jul 1920 | Box 80 \ 2 scan0314 | |
| The performance and design of rear leaf springs, comparing pre-war types with current models and materials. | 31th Jul 1920 | Box 80 \ 2 scan0315 | |
| Continued discussion on experimenting with improved rear springs for cars with known faults. | 31th Jul 1920 | Box 80 \ 2 scan0316 | |
| Test report comparing the durability of pre-war, modified, and standard rear springs on a bumping rig. | 19th Feb 1920 | Box 80 \ 2 scan0317 | |
| Test results for two six-leaf springs detailing Brinell hardness, run times, and wear patterns. | 9th Aug 1920 | Box 80 \ 2 scan0318 | |
| Order for road springs for the American branch, highlighting potential delays and design considerations. | 1st Aug 1920 | Box 80 \ 2 scan0319 | |
| Test report for a nine-leaf parallel spring, detailing Brinell hardness and damage after a time run. | 18th Aug 1920 | Box 80 \ 2 scan0320 | |
| Test report for a 9-leaf parallel spring, detailing Brinell hardness and crack analysis after a timed run. | 19th Aug 1920 | Box 80 \ 2 scan0321 | |
| Cause and potential remedies for squeaking springs. | 9th Sep 1920 | Box 80 \ 2 scan0322 | |
| Continued memo discussing spring lubrication, noise issues, and potential solutions. | 3rd Sep 1920 | Box 80 \ 2 scan0323 | |
| Testing Ferodo interleaving material on springs and its effect on axle dithering and shock absorbers. | 7th Sep 1920 | Box 80 \ 2 scan0324 | |
| Testing methods for leaf type springs, comparing greasing versus interleaving material. | 7th Sep 1920 | Box 80 \ 2 scan0325 | |
| Design of a new type of rear spring, including clips and spring eye types. | 30th Apr 1920 | Box 80 \ 2 scan0326 | |
| Continued discussion on spring clip design and performance under various loads. | 30th Apr 1920 | Box 80 \ 2 scan0327 | |
| Analysis of different clip suggestions for spring plates and the reasons for plate breakage. | 1st Apr 1920 | Box 80 \ 2 scan0328 | |
| Modifying springs for the 2000th chassis, with reference to Mr. Woodhead's remarks. | 30th Apr 1920 | Box 80 \ 2 scan0329 | |
| Technical note discussing design considerations and proposed modifications for rear road springs. | 6th May 1920 | Box 80 \ 2 scan0330 | |
| Modifications to forgings, rear road springs, and front shock absorber anchorages. | 18th May 1920 | Box 80 \ 2 scan0331 | |
| The production and supply status of various rear springs from supplier Jonas Woodhead & Sons Ltd. | 1st Jun 1920 | Box 80 \ 2 scan0332 | |
| Report from Jonas Woodhead & Sons Ltd. on the material position for manufacturing laminated rear springs. | 7th Jun 1920 | Box 80 \ 2 scan0333 | |
| Visit to supplier Jonas Woodhead & Sons Ltd. concerning front and rear spring requirements and design. | 14th Jun 1920 | Box 80 \ 2 scan0334 | |
| Workload for testing and repairing rear springs, proposing a third party handles some of the work. | 18th Jun 1920 | Box 80 \ 2 scan0335 | |
| Design and experimental production of new rear road springs with thinner leaves. | 18th Jun 1920 | Box 80 \ 2 scan0336 | |
| Design and trial of two different types of spring clips. | 15th Jun 1920 | Box 80 \ 2 scan0337 | |
| Upcoming visit from Mr. Alfred Woodhead of Jonas Woodhead & Sons Ltd. to discuss rear and front spring designs. | 18th Jun 1920 | Box 80 \ 2 scan0338 | |
| Preliminary report on the investigation of rear road springs, detailing findings on plate thickness, stress points, and leaf breakage. | 30th Jun 1920 | Box 80 \ 2 scan0339 | |
| Methods for calculating spring plate thickness and ordering new sample sets for comparison. | 30th Jun 1920 | Box 80 \ 2 scan0340 | |
| Design of rear road springs, comparing pre-war parabolic end types with newer square end designs. | 11th Aug 1920 | Box 80 \ 2 scan0341 | |
| Particulars of different leaf spring designs for testing and experimentation. | 16th Aug 1920 | Box 80 \ 2 scan0342 | |
| Change in specification for chassis front springs, specifically regarding the use of flat plates and square-edge steel. | 27th Nov 1920 | Box 80 \ 2 scan0343 | |
| Side movement and twisting of rear springs on a test chassis. | 16th Mar 1921 | Box 80 \ 2 scan0344 | |
| The addition of clips to pre-war rear road springs with parabolic leaf ends to counteract plate movement. | 16th Mar 1921 | Box 80 \ 2 scan0345 | |
| Side movement and twisting of rear spring leaves on a chassis. | 16th Mar 1921 | Box 80 \ 2 scan0346 | |
| Requesting the production of 24 new roller plates for rear springs due to issues with the current parts. | 6th Oct 1920 | Box 80 \ 2 scan0347 | |
| Ordering and fitting different roller plates for rear springs to resolve a chassis knock. | 13th Oct 1920 | Box 80 \ 2 scan0348 | |
| Suggesting a trial modification to rear axle spring fittings to eliminate a knocking sound. | 1st Nov 1920 | Box 80 \ 2 scan0349 | |
| Spring shackle clearance and the use of sheet nickel silver for radiators. | 11th Nov 1920 | Box 80 \ 2 scan0350 | |
| Customer complaints of a knocking sound caused by play in the rear springs. | 23th Nov 1920 | Box 80 \ 2 scan0351 | |
| Modification of the wearing plate on 40/50 model rear springs to accommodate thin leaves. | 27th Nov 1920 | Box 80 \ 2 scan0352 | |
| Suggested improved roller plate for rear axle spring supports to fix a knocking issue. | 30th Nov 1920 | Box 80 \ 2 scan0353 | |
| Production and standardisation of an improved roller plate for rear axle spring supports. | 1st Dec 1920 | Box 80 \ 2 scan0354 | |
| Directive regarding an improved wearing plate for rear springs to address issues with sideways wear on the roller. | 9th Dec 1920 | Box 80 \ 2 scan0355 | |
| Customer complaints of spring knocking and a suggested improved plate for rear axle spring supports. | 9th Dec 1920 | Box 80 \ 2 scan0356 | |
| Customer complaints of a knocking sound from rear springs and the solution of fitting wearing plates. | 9th Dec 1920 | Box 80 \ 2 scan0357 | |
| Cover letter for a standardisation sheet regarding bearing plates for rear springs. | 11th Dec 1928 | Box 80 \ 2 scan0358 | |
| Standardisation sheet for wearing plates for rear springs, requesting costs be entered urgently. | 11th Dec 1920 | Box 80 \ 2 scan0359 | |
| Modifications to the wearing plate on the rear spring. | 13th Dec 1920 | Box 80 \ 2 scan0360 | |
| Modifications to the wearing plate on the rear spring. | 13th Dec 1920 | Box 80 \ 2 scan0361 | |
| Standardisation sheet for a wearing plate on a rear spring. | 15th Dec 1920 | Box 80 \ 2 scan0362 | |
| Requesting review and signature for a standardisation sheet on rear springs and wearing plates. | 17th Dec 1920 | Box 80 \ 2 scan0363 | |
| Producing experimental parts for an improved roller plate on thin leaf type rear road springs for the 40/50 chassis. | 17th Dec 1920 | Box 80 \ 2 scan0364 | |
| Internal query about the testing, fitting, and historical performance of rear spring wearing plates. | 21th Dec 1920 | Box 80 \ 2 scan0365 | |
| Use and modification of wearing plates on rear leaf springs. | 22th Dec 1920 | Box 80 \ 2 scan0366 | |
| Chasing a signature for a standardisation sheet concerning modified wearing plates for rear springs. | 1st Mar 1921 | Box 80 \ 2 scan0367 | |
| Serious customer complaints about a knocking noise from the rear axle rollers and the proposed solution of fitting wearing plates. | 1st Mar 1921 | Box 80 \ 2 scan0368 | |
| Knock on cars caused by rear springs on axle rollers and the consideration of fitting wearing plates. | 3rd Mar 1921 | Box 80 \ 2 scan0369 | |
| The re-use of wider wearing plates for rear springs and the urgent need for a standardisation sheet. | 8th Mar 1921 | Box 80 \ 2 scan0370 | |
| Approval process for the standardisation sheet for wear plates for rear springs. | 7th Mar 1921 | Box 80 \ 2 scan0371 | |
| Standardisation of rear spring wearing plates to overcome knocking between the spring and roller. | 11th Dec 1920 | Box 80 \ 2 scan0372 | |
| Routing note regarding a document sent for reference, returned by mistake, and subsequently filed. | 11th Dec 1920 | Box 80 \ 2 scan0373 | |
| Standardisation of wearing plates fitted between the rear springs and rollers to overcome knocking. | 11th Dec 1920 | Box 80 \ 2 scan0374 | |
| Inter-office correspondence regarding the material change for wearing plates on rear springs. | 20th Apr 1921 | Box 80 \ 2 scan0375 | |
| Policy for fitting wearing plates to rear springs on 'O' series cars. | 20th May 1921 | Box 80 \ 2 scan0376 | |
| Letter from the American branch to London regarding customer complaints about noises from rear springs. | 3rd May 1921 | Box 80 \ 2 scan0377 | |
| Customer complaint letter regarding a 1921 vehicle and its various faults. | 30th Apr 1921 | Box 80 \ 2 scan0378 | |
| Instruction note comparing two design schemes (F4118 and F4119) for a new front anchorage for rear springs. | 24th Oct 1913 | Box 80 \ 3 scan0001 | |
| Comparison of two rear spring fitting designs, favouring the design from blueprint F.4119 over the U-section design from F.4118. | 31th Oct 1913 | Box 80 \ 3 scan0002 | |
| Proposed design improvements to a frame, including links, studs, and cross-members, with feedback on specific blueprints. | 31th Oct 1913 | Box 80 \ 3 scan0003 | |
| Note describing a better construction for a removable link and a castellated nut. | 31th Oct 1913 | Box 80 \ 3 scan0004 | |
| Instruction memo to Mr. Royce regarding a revised scheme for the front anchorage of rear springs, including stress calculations and a small diagram. | 12th Nov 1913 | Box 80 \ 3 scan0005 | |
| Internal instruction memo discussing the manufacturing difficulty of drop forging a U-shaped design for the front anchorage of rear springs. | 19th Nov 1913 | Box 80 \ 3 scan0006 | |
| Instruction to Mr Wormald to dispatch an accompanying instruction to Mr Royce. | 19th Nov 1913 | Box 80 \ 3 scan0007 | |
| Instructions to plug and re-drill holes in a spring suspension bracket. | 10th Feb 1914 | Box 80 \ 3 scan0008 | |
| Referencing general arrangement drawing F4200 for the front anchorage of rear springs. | 16th Feb 1914 | Box 80 \ 3 scan0009 | |
| The fitting and dynamometer testing of a new bracket for the front end of the rear springs. | 17th Feb 1914 | Box 80 \ 3 scan0010 | |
| Anchorage of rear springs, halting the fitting of new brackets until a new device is tested. | 17th Feb 1914 | Box 80 \ 3 scan0011 | |
| Instruction to provide Mr Matthews with a bare frame fitted with front and rear springs. | 17th Feb 1914 | Box 80 \ 3 scan0012 | |
| Weakness of the rear spring fixing and proposing reinforcements. | 19th Feb 1914 | Box 80 \ 3 scan0013 | |
| Instructions for preparing a chassis with axles and spring anchorage for testing purposes. | 20th Feb 1914 | Box 80 \ 3 scan0014 | |
| 'slurring test' for a rear spring bracket and its impact on implementing other vehicle improvements. | 23th Feb 1914 | Box 80 \ 3 scan0015 | |
| Bumping test of the rear of a chassis to test the forward frame brackets of the rear springs. | 25th Feb 1914 | Box 80 \ 3 scan0016 | |
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