| Description | Date | Identifier | |
| To Mr Spinney requesting a scheme for a 16-gallon petrol tank. | 24th Aug 1912 | Box 80 \ 1 scan0293 | |
| Instructions to modify an extra petrol tank for car 2074 due to excessive frame swing from undersized axle seatings. | 4th Oct 1912 | Box 80 \ 1 scan0294 | |
| Instructions to alter the tank on car 1811 and to improve the axle seals. | 4th Oct 1912 | Box 80 \ 1 scan0295 | |
| Typed letter discussing Mr Spinney's report on issues with extra petrol tanks and spring side swing. | 16th Nov 1912 | Box 80 \ 1 scan0296 | |
| Letter from the Experimental Department requesting particulars of a device designed to prevent petrol theft. | 14th Jan 1927 | Box 80 \ 1 scan0297 | |
| Mrs. D. Leverson's petrol tank device and arranging a follow-up. | 17th Jan 1927 | Box 80 \ 1 scan0298 | |
| The required weights on the rear tyres for a long chassis to normalize spring camber and bring rubber buffers into contact. | 8th Jul 1911 | Box 80 \ 2 scan0001 | |
| Comparative analysis of spring and chassis weights for different car makes. | 8th Apr 1913 | Box 80 \ 2 scan0002 | |
| Technical comparison of spring flexibility and specifications for Rolls-Royce, Lanchester, and Delaunay Belleville cars. | 8th Apr 1913 | Box 80 \ 2 scan0003 | |
| Comparative analysis of rear spring specifications for Rolls-Royce, Lanchester, and Delaunay Belleville vehicles. | 8th Apr 1913 | Box 80 \ 2 scan0004 | |
| Continued note on taking readings from Lanchester rear springs and the importance of correct rigging. | 8th Apr 1913 | Box 80 \ 2 scan0005 | |
| Design modifications to the rear spring anchorage to reduce weight and stress. | 24th Mar 1914 | Box 80 \ 2 scan0006 | |
| From R. to J. discussing the design and stresses of spring plates. | 24th Mar 1914 | Box 80 \ 2 scan0007 | |
| Selection and potential modifications of a hydraulic spring tester. | 2nd Jun 1914 | Box 80 \ 2 scan0008 | |
| Required measurement specifications for a Hydraulic Spring Tester. | 2nd Jun 1914 | Box 80 \ 2 scan0009 | |
| Extract report on the poor road-holding capabilities and springing of chassis No 7-CA. | 9th Sep 1916 | Box 80 \ 2 scan0010 | |
| Expressing a dislike for large road wheels, citing them as a disadvantage to the chassis. | 3rd Oct 1916 | Box 80 \ 2 scan0011 | |
| List of specifications for a post-war chassis, covering engine components and a detailed proposal for a new rear axle and suspension. | 3rd Oct 1916 | Box 80 \ 2 scan0012 | |
| Axle and suspension testing, and an investigation into a broken brake strap. | 3rd Oct 1916 | Box 80 \ 2 scan0013 | |
| Front and rear axle setup, steering stability, and shock dampers on a post-war chassis. | 3rd Oct 1916 | Box 80 \ 2 scan0014 | |
| Suspension characteristics, spring friction, and experimenting with Truffault pattern shock absorbers. | 3rd Oct 1916 | Box 80 \ 2 scan0015 | |
| The readiness of special springs for fitting to Commander Briggs' car, 64-LB. | 4th Dec 1916 | Box 80 \ 2 scan0016 | |
| The fitting of special cantilever springs to Commander Briggs' car. | 23th Sep 1916 | Box 80 \ 2 scan0017 | |
| Note discussing the design of road springs for the 40/50 HP chassis. | 1st Feb 1928 | Box 80 \ 2 scan0018 | |
| Extract detailing the design of the road springs for the 45/50 HP Chassis. | 30th Jun 1919 | Box 80 \ 2 scan0019 | |
| Experiments on a new trial chassis, focusing on the positioning and lubrication of springs. | 30th Jun 1919 | Box 80 \ 2 scan0020 | |
| Assembly report for Chassis 1. E.X., detailing the components and part numbers used. | 30th Jun 1919 | Box 80 \ 2 scan0021 | |
| Road test report on Chassis 1.E.X. after a 1000-mile run, focusing on springing and handling. | 28th Jul 1919 | Box 80 \ 2 scan0022 | |
| Road test report on chassis performance, handling, tyres and electrical equipment. | 28th Jul 1919 | Box 80 \ 2 scan0023 | |
| Chassis care, lubrication practices, and observations from a 1000-mile road test. | 28th Jul 1919 | Box 80 \ 2 scan0024 | |
| Failure report on a steering box rocking lever and a front spring during chassis bumping rig tests, including a metallurgical analysis. | 11th Aug 1919 | Box 80 \ 2 scan0025 | |
| Metallurgical analysis report on a fractured road spring. | 11th Aug 1919 | Box 80 \ 2 scan0026 | |
| The setup and results of a 40/50 chassis bumping test. | 18th Aug 1919 | Box 80 \ 2 scan0027 | |
| Component failures, their operational time before failure, and associated remarks or analysis. | 13th Jun 1919 | Box 80 \ 2 scan0028 | |
| Query regarding a spring sample not meeting the load specified on the drawing. | 1st Sep 1919 | Box 80 \ 2 scan0029 | |
| Requesting a piece of a fractured leaf from a broken front spring to take up with a supplier named Woodheads. | 6th Sep 1919 | Box 80 \ 2 scan0030 | |
| Return of a broken front road spring for replacement. | 30th Oct 1919 | Box 80 \ 2 scan0031 | |
| Additional detail for an experimental front road spring bush on the 40/50 chassis. | 10th Nov 1919 | Box 80 \ 2 scan0032 | |
| Rear springs, noting a squeaking issue with new thick-leaf springs and discussing lubrication, friction, and the use of leather covers. | 13th Nov 1919 | Box 80 \ 2 scan0033 | |
| Source of squeaking in rear springs and considering the trial of leather gaiters. | 17th Nov 1919 | Box 80 \ 2 scan0034 | |
| 40/50 chassis bumping test detailing the failure of a side member and a steering rocking lever. | 24th Nov 1919 | Box 80 \ 2 scan0035 | |
| Component failures and hours run during bumping tests with 2' bumps at 60º and a drum speed of 105 per minute. | 27th Nov 1919 | Box 80 \ 2 scan0036 | |
| Customer's car handling issues at high speed due to weak springs and proposing a demonstration to diagnose the problem. | 22th Jan 1920 | Box 80 \ 2 scan0037 | |
| Comparative steering tests on a 40/50 chassis, focusing on split versus solid leaf springs and new shock absorbers. | 26th Nov 1920 | Box 80 \ 2 scan0038 | |
| Telegram confirmation regarding a steering complaint attributed to the side flexibility of rear springs. | 26th Jan 1920 | Box 80 \ 2 scan0039 | |
| Steering difficulty caused by rear spring flexibility and proposing tests. | 26th Jan 1920 | Box 80 \ 2 scan0040 | |
| Typed memorandum with a hand-drawn diagram illustrating a modification to steering pivots and a side steering tube with set up springs. | 26th Jan 1920 | Box 80 \ 2 scan0041 | |
| Investigating complaints of faulty steering on the covered trials car 1.LW. | 26th Jan 1920 | Box 80 \ 2 scan0042 | |
| Unstable steering tests, particularly when driving on tram lines, and proposed changes to the rear springs. | 26th Jan 1920 | Box 80 \ 2 scan0043 | |
| Confirming the handover of a rough sketch of parts for a spring side deflection experiment. | 26th Jan 1920 | Box 80 \ 2 scan0044 | |
| Steering characteristics at high speeds, considering rear springs, body type, and weight distribution. | 27th Jan 1920 | Box 80 \ 2 scan0045 | |
| Handling characteristics of a racing car, focusing on suspension, steering, and solutions for wobbles. | 27th Jan 1920 | Box 80 \ 2 scan0046 | |
| Continued discussion on proposed modifications to the vehicle's suspension and steering system. | 27th Jan 1920 | Box 80 \ 2 scan0047 | |
| Letter regarding a failure of a shock absorber lever and the dispatch of replacement parts. | 28th Jan 1920 | Box 80 \ 2 scan0048 | |
| Instructions for testing shock absorbers and rear springs following a component failure. | 6th Aug 1919 | Box 80 \ 2 scan0049 | |
| Typed letter discussing car testing progress, mileage targets, piston knocks, and a comparison with another vehicle. | 6th Aug 1919 | Box 80 \ 2 scan0050 | |
| Comparative test results for springs with split leaves versus solid springs. | 30th Jan 1920 | Box 80 \ 2 scan0051 | |
| Internal memorandum detailing experiments on a bump test rig to investigate steering complaints related to rear leaf springs. | 31th Jan 1920 | Box 80 \ 2 scan0052 | |
| Spring and axle testing, comparing solid versus split springs and their effect on vehicle road holding. | 31th Jan 1920 | Box 80 \ 2 scan0053 | |
| Results of bump tests on split springs, noting violent bouncing at high speeds and the challenges of road testing due to weather. | 31th Jan 1920 | Box 80 \ 2 scan0054 | |
| The testing of solid and split springs, detailing a failure on the bumping rig and issues with squeaking. | 3rd Feb 1920 | Box 80 \ 2 scan0055 | |
| Chassis testing, detailing the effects of spring material and greasing on vehicle rolling and swaying. | 13th Feb 1920 | Box 80 \ 2 scan0056 | |
| The urgent and difficult situation with the manufacture and supply of rear springs. | 5th Feb 1920 | Box 80 \ 2 scan0057 | |
| Comparison of split versus unsplit leaf springs for different driving conditions. | 1st Nov 1920 | Box 80 \ 2 scan0058 | |
| Performance differences between split and solid leaf springs and the decision on which to standardize. | 26th Apr 1917 | Box 80 \ 2 scan0059 | |
| Page stating the need for instructions from Mr. Royce and Mr. Johnson to proceed with necessary tests. | 5th Feb 1919 | Box 80 \ 2 scan0060 | |
| Copy of a telegram discussing the manufacturing situation and supply of split versus unsplit rear springs. | 5th Feb 1919 | Box 80 \ 2 scan0061 | |
| Instructions from Mr. Royce regarding rear road springs and shock absorber experiments. | 6th Feb 1920 | Box 80 \ 2 scan0062 | |
| Copy of a telegram from Mr. Royce regarding rear springs and shock dampers. | 6th Feb 1920 | Box 80 \ 2 scan0063 | |
| Telegram from Mr. Johnson instructing a rigorous road test for rear springs on a landaulet. | 9th Feb 1920 | Box 80 \ 2 scan0064 | |
| The compromise between road-holding and comfort regarding split and unsplit rear springs. | 9th Feb 1920 | Box 80 \ 2 scan0065 | |
| The comparison tests and experimental findings between split and solid springs. | 9th Feb 1920 | Box 80 \ 2 scan0066 | |
| Car handling issues with split springs, leading to poor steering, rolling, and swaying. | 9th Feb 1920 | Box 80 \ 2 scan0067 | |
| Adjustments and performance observations for the 1.EX car, noting improvements in slow running and issues with steering on muddy roads. | 9th Feb 1920 | Box 80 \ 2 scan0068 | |
| Log of bumper spring test results, detailing breakages, test durations, and dates. | 15th Apr 1920 | Box 80 \ 2 scan0069 | |
| Transcribing a telegram from Mr. Royce regarding a steering complaint attributed to rear spring flexibility. | 2nd Feb 1920 | Box 80 \ 2 scan0070 | |
| Containing a telegram from Mr. Royce about the use of solid rear road springs. | 2nd Feb 1920 | Box 80 \ 2 scan0071 | |
| The failure of three split rear springs during testing on a bumping rig. | 16th Feb 1920 | Box 80 \ 2 scan0072 | |
| Continued discussion on implementing clips on split leaf springs to prevent breakages and reduce lateral flexibility. | 16th Feb 1920 | Box 80 \ 2 scan0073 | |
| From Mr. Royce about replacing solid eyes with rolled eyes for the rear springs of the 40/50 HP chassis. | 17th Feb 1920 | Box 80 \ 2 scan0074 | |
| Telegram transcript detailing test results and complaints about springs and shock absorbers on Mr. Salamanca's car. | 17th Feb 1920 | Box 80 \ 2 scan0075 | |
| Correct procedure for testing back springs on fully loaded Landaulette cars. | 17th Feb 1920 | Box 80 \ 2 scan0076 | |
| Steering and road holding issues, with proposed solutions related to springs and shock dampers. | 20th Feb 1920 | Box 80 \ 2 scan0077 | |
| Steering satisfaction, attributing issues to the absence of shock dampers and tyre design rather than split rear springs. | 20th Feb 1920 | Box 80 \ 2 scan0078 | |
| Car's condition and performance, noting issues with split springs after running 3,000 miles. | 20th Feb 1920 | Box 80 \ 2 scan0079 | |
| Steering and springing tests conducted on a 40/50 chassis, investigating instability issues. | 20th Feb 1920 | Box 80 \ 2 scan0080 | |
| Steering complaints and the effects of different tyre types and suspension setups on vehicle handling. | 20th Feb 1920 | Box 80 \ 2 scan0081 | |
| Steering issues, comparing split vs solid springs and the effects of greasing and tyre types. | 20th Feb 1920 | Box 80 \ 2 scan0082 | |
| Strengthening of rear springs and recommendations for weight adjustments on different car bodies. | 23th Feb 1920 | Box 80 \ 2 scan0083 | |
| Excellent steering and riding of a chassis when fitted with a light Labourdette body. | 23th Feb 1920 | Box 80 \ 2 scan0084 | |
| Strengthening of rear springs and weight adjustments for different car body types. | 23th Feb 1920 | Box 80 \ 2 scan0085 | |
| The procedure for implementing stronger rear springs, awaiting a standardisation sheet. | 25th Feb 1920 | Box 80 \ 2 scan0086 | |
| Laboratory report on a fractured car spring, attributing the failure to incorrect heat treatment. | 28th Feb 1920 | Box 80 \ 2 scan0087 | |
| History and proposal for using solid eyes on rear springs, with suggestions for alternative designs. | 1st Mar 1920 | Box 80 \ 2 scan0088 | |
| Continued discussion on the advantages of converting split springs to unsplit springs for existing cars. | 1st Mar 1920 | Box 80 \ 2 scan0089 | |
| Excessive wear on rear spring contact plates to rollers on test cars. | 3rd Mar 1920 | Box 80 \ 2 scan0090 | |
| List of proposed modifications for the trials car for the American Company. | 4th Mar 1920 | Box 80 \ 2 scan0091 | |
| Proposed change to the rear leaf spring design, from ends bent over to ends tapered in thickness. | 5th Mar 1920 | Box 80 \ 2 scan0092 | |
| Internal memorandum on spring design, discussing issues with friction, squeaking, and reverting to older manufacturing practices. | 5th Mar 1920 | Box 80 \ 2 scan0093 | |
| 'jaggering' effect during braking on chassis 3X and its relation to the clutch operation. | 9th Mar 1920 | Box 80 \ 2 scan0094 | |
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