| Description | Date | Identifier | |
| Letter to Luvax Ltd. regarding tests on their NP.3 shock absorbers for the 25 HP car. | 11th Aug 1931 | Box 28 \ 1 Scan261 | |
| Analysis of shock absorber performance issues under different loads, temperatures, and oil viscosity. | 11th Aug 1931 | Box 28 \ 1 Scan262 | |
| The performance and faults of Luvax Ltd. shock absorbers, including analysis of oil viscosity and leakage. | 11th Aug 1931 | Box 28 \ 1 Scan263 | |
| Letter to Luvax Ltd. discussing the performance and test results of a shock absorber, referencing specific diagrams. | 8th Jul 1931 | Box 28 \ 1 Scan264 | |
| Blueprint detailing dimensions and calculations for a Luvax Damper Type M.P.III. | 8th Jul 1931 | Box 28 \ 1 Scan265 | |
| Series of indicator diagrams for a Luvan M.Phantom III under various load and temperature conditions. | 11th Aug 1931 | Box 28 \ 1 Scan266 | |
| Blank document page with a purple date stamp from the Derby office. | 11th Aug 1931 | Box 28 \ 1 Scan267 | |
| Series of six graphs comparing Luxan M.P. III high and low pressure performance under various load and oil conditions. | 8th Jul 1931 | Box 28 \ 1 Scan268 | |
| Stamped blank page, likely a divider or the back of a document. | 11th Aug 1931 | Box 28 \ 1 Scan269 | |
| Four performance graphs for the LuvaX M.Phantom II component under various test conditions. | 8th Jul 1931 | Box 28 \ 1 Scan270 | |
| Four graphs comparing 'LUNAR L.C.' low and high pressure tests under different load, stroke, and temperature conditions. | 13th Jul 1931 | Box 28 \ 1 Scan271 | |
| Blank document page with a Print Room stamp. | 11th Aug 1931 | Box 28 \ 1 Scan272 | |
| Four indicator diagrams for a 'Lulax LC' component under different pressure and temperature conditions. | 13th Jul 1931 | Box 28 \ 1 Scan273 | |
| Blank document page with a purple archival date stamp. | 1st Aug 1981 | Box 28 \ 1 Scan274 | |
| Letter from Joseph Lucas Limited regarding a proposed meeting date with a representative. | 21th Aug 1931 | Box 28 \ 1 Scan275 | |
| Letter to Joseph Lucas Ltd. rescheduling a meeting with their representative. | 22th Aug 1931 | Box 28 \ 1 Scan276 | |
| Comparison of the manufacturing and design differences between 'Delco' and 'HS/Rm' type split damper pistons. | 31th Aug 1931 | Box 28 \ 1 Scan277 | |
| Comparison of manufacturing operation sequences for 'Delco' and 'HS/Rm' type pistons. | 15th Oct 1931 | Box 28 \ 1 Scan278 | |
| Blueprint detailing the probable manufacturing operations for a 'Delco' Damper Piston. | 15th Oct 1931 | Box 28 \ 1 Scan279 | |
| Requesting the procurement of 5 gallons of Lovejoy oil and a cost comparison for its use in shock absorbers. | 21th Sep 1931 | Box 28 \ 1 Scan280 | |
| Letter from Joseph Lucas Limited arranging a meeting to discuss Shock Absorbers. | 22th Sep 1931 | Box 28 \ 1 Scan281 | |
| Letter to Messrs. J. Lucas Ltd. regarding a meeting to discuss shock absorbers. | 24th Sep 1931 | Box 28 \ 1 Scan282 | |
| The respective costs of Air Compressor Oil and 'Lovejoy' Oil. | 30th Sep 1931 | Box 28 \ 1 Scan283 | |
| General arrangement of Marles Steering Gear R7 Type RH. | 29th Jul 1930 | Box 28 \ 2 Scan001 | |
| Blueprint showing the layout of a right-hand 'Q' gear assembly and its connection points. | 1st Oct 1932 | Box 28 \ 2 Scan002 | |
| Various steering gear systems and their respective advantages and disadvantages. | 10th Jul 1925 | Box 28 \ 2 Scan003 | |
| Steering system alternatives, modifications, and testing of different worm pitches. | 17th Jul 1925 | Box 28 \ 2 Scan004 | |
| The experimental fitting of a Marles steering gear to a New Phantom chassis. | 8th Jul 1925 | Box 28 \ 2 Scan005 | |
| Requesting that the Marle steering gear be made suitable for 'D' steering. | 1st Jul 1925 | Box 28 \ 2 Scan006 | |
| Arrangements for a new Phantom special steering column of the Marles type. | 1st Sep 1925 | Box 28 \ 2 Scan007 | |
| Comparative test report on Marles steering versus the new Phantom steering. | 2nd Feb 1926 | Box 28 \ 2 Scan008 | |
| Performance comparison of Marles steering against other steering systems, focusing on ratio and efficiency. | 2nd Feb 1926 | Box 28 \ 2 Scan009 | |
| Comparison of the effort required for 'Good EAC. Steering' versus 'Marles Steering'. | 2nd Feb 1926 | Box 28 \ 2 Scan010 | |
| Graph and data table comparing the ratio of movement of the steering wheel to the pendulum lever for the New Phantom and Marles steering systems. | 3rd Mar 1926 | Box 28 \ 2 Scan011 | |
| Request for clarification regarding a reference to lubricated and unlubricated readings for Marles Steering. | 3rd Mar 1926 | Box 28 \ 2 Scan012 | |
| Clarifying figures from a report on lubricated vs. un-lubricated tests for Marles and Phantom steerings. | 9th Mar 1926 | Box 28 \ 2 Scan013 | |
| Letter from Adamant Engineering Company regarding the performance of their Marles Steering Gear during a world record attempt. | 29th Apr 1926 | Box 28 \ 2 Scan014 | |
| Letter from HPG. Brakenridge & Co., representatives for 'Marles' Steering Gear, requesting feedback on a supplied trial set. | 16th Aug 1926 | Box 28 \ 2 Scan015 | |
| Letter to Messrs. HPG. Brakenridge & Co. regarding the experimental Marles Steering Gear. | 23th Aug 1926 | Box 28 \ 2 Scan016 | |
| Requesting tests on a Marles steering system for the 98-NK car. | 26th Oct 1927 | Box 28 \ 2 Scan017 | |
| Request to manufacture and fit a steering column support for a Marles steering column on chassis 98-NK. | 15th Nov 1927 | Box 28 \ 2 Scan018 | |
| Requirements for carrying out steering experiments on a test vehicle. | 22th Jul 1932 | Box 28 \ 2 Scan019 | |
| Inquiry to the Adamant Engineering Co. Ltd. regarding improvements and comparisons of their Marles steering box. | 22th Jul 1932 | Box 28 \ 2 Scan020 | |
| Letter from Adamant Engineering Company regarding modifications to the Marles Steering Gear. | 25th Jul 1932 | Box 28 \ 2 Scan021 | |
| Letter from Adamant Engineering Company regarding the testing of steering gear and a comparison with American types. | 25th Jul 1932 | Box 28 \ 2 Scan022 | |
| Letter to Adamant Engineering Co., Ltd. regarding modifications and pricing for steering improvements. | 27th Jul 1932 | Box 28 \ 2 Scan023 | |
| Letter from HPG. Brakenridge & Co., representatives for Adamant Engineering, requesting an appointment. | 28th Jul 1932 | Box 28 \ 2 Scan024 | |
| Letter to HPG. Brakenridge & Co. arranging a meeting about experiments on a P.2 car's Marles steering gear. | 30th Jul 1932 | Box 28 \ 2 Scan025 | |
| Letter from Adamant Engineering Company regarding a proposal for modifying a Marles Steering Gear. | 3rd Aug 1932 | Box 28 \ 2 Scan026 | |
| Letter from Adamant Engineering Company Limited regarding the supply and design of steering gears. | 3rd Aug 1932 | Box 28 \ 2 Scan027 | |
| Letter from HPG. Brakenridge & Co. arranging a visit to the works. | 3rd Aug 1932 | Box 28 \ 2 Scan028 | |
| Letter from Adamant Engineering Company regarding a cancelled visit to test Marles Steering on a P2 car. | 9th Aug 1932 | Box 28 \ 2 Scan029 | |
| Letter from HPG. Brakenridge & Co. discussing a potential meeting, which may no longer be necessary. | 10th Aug 1932 | Box 28 \ 2 Scan030 | |
| Letter discussing availability for service related to a trip to Derby. | 10th Aug 1932 | Box 28 \ 2 Scan031 | |
| Letter to Adamant Engineering Co. comparing their Marles steering system with Rolls-Royce's own, focusing on reversibility and road shock. | 10th Aug 1932 | Box 28 \ 2 Scan032 | |
| Letter to Mr. HPG. Brakenridge proposing a meeting to discuss production. | 11th Aug 1932 | Box 28 \ 2 Scan033 | |
| Letter from Adamant Engineering Company discussing the characteristics of Marles steering gear, specifically regarding road shocks and irreversibility. | 11th Aug 1932 | Box 28 \ 2 Scan034 | |
| Letter discussing steering gear ratios, roller bearings, and the Marles-Weller Steering Gear. | 11th Aug 1932 | Box 28 \ 2 Scan035 | |
| Continued letter discussing Marles and Marles-Weller steering gears and their application in various vehicles. | 11th Aug 1932 | Box 28 \ 2 Scan036 | |
| Letter from Adamant Engineering Company Limited concluding a proposal to supply sample gears for testing. | 11th Aug 1932 | Box 28 \ 2 Scan037 | |
| Letter to The Adamant Engineering Co. Ltd. discussing the merits and inefficiencies of American versus Marles steering systems. | 12th Aug 1932 | Box 28 \ 2 Scan038 | |
| Letter to Adamant Engineering requesting performance figures and a cost for Marles-Weller steering gears. | 15th Aug 1932 | Box 28 \ 2 Scan039 | |
| Letter from Adamant Engineering Company acknowledging receipt of a letter and promising a full reply. | 15th Aug 1932 | Box 28 \ 2 Scan040 | |
| Letter from Adamant Engineering discussing the design and characteristics of steering gears, particularly road reaction and self-centring. | 17th Aug 1932 | Box 28 \ 2 Scan041 | |
| Letter discussing the complexities of steering design, comparing Marles Steering to others, and noting its performance. | 17th Aug 1932 | Box 28 \ 2 Scan042 | |
| Letter from Adamant Engineering Company Limited detailing prices for different steering gear models. | 17th Aug 1932 | Box 28 \ 2 Scan043 | |
| Letter to Adamant Engineering Co. Ltd. requesting efficiency figures for a Marles Weller type steering box. | 18th Aug 1932 | Box 28 \ 2 Scan044 | |
| Letter from Adamant Engineering Company regarding tests conducted on steering gears. | 30th Aug 1932 | Box 28 \ 2 Scan045 | |
| Letter from Adamant Engineering Company Limited discussing gear efficiency testing procedures and the supply of custom cams. | 30th Aug 1932 | Box 28 \ 2 Scan046 | |
| Letter from Adamant Engineering Company containing a table of test results for steering gears. | 30th Aug 1932 | Box 28 \ 2 Scan047 | |
| Graph of steering and castoring efficiency for a Marles-Weller Type O Standard gear. | 30th Aug 1932 | Box 28 \ 2 Scan048 | |
| Blueprint detailing an impact test for a steering gear component. | 25th May 1927 | Box 28 \ 2 Scan049 | |
| Letter to Adamant Engineering Co. Ltd. discussing steering gear comparisons with General Motors and requesting test results. | 9th Sep 1932 | Box 28 \ 2 Scan050 | |
| Letter to The Adamant Engineering Co. about testing a Marles steering gear against their own steering column. | 13th Sep 1932 | Box 28 \ 2 Scan051 | |
| Letter from Adamant Engineering Company regarding the supply of Marles-Weller steering gears and a request for drawings. | 13th Sep 1932 | Box 28 \ 2 Scan052 | |
| Points requiring attention when adapting a Marles steering box to a 'C' type chassis. | 23th Sep 1932 | Box 28 \ 2 Scan053 | |
| Letter to Adamant Engineering Co. about fitting a steering box to a Phantom car. | 24th Sep 1932 | Box 28 \ 2 Scan054 | |
| Letter from Adamant Engineering Co. discussing steering box compatibility issues. | 24th Sep 1932 | Box 28 \ 2 Scan055 | |
| The concluding page of a letter addressed to Adamant Engineering Co. | 27th Sep 1932 | Box 28 \ 2 Scan056 | |
| Letter from Adamant Engineering Company regarding the difficulty of fitting a standard Marles Steering gear and arranging a meeting to resolve it. | 27th Sep 1932 | Box 28 \ 2 Scan057 | |
| Blueprint for a right-hand cam with 3 1/4 turns. | 26th Aug 1930 | Box 28 \ 2 Scan058 | |
| Blueprint drawing for a Rocker Shaft. | 10th Dec 1924 | Box 28 \ 2 Scan059 | |
| Blueprint drawing for a Cam. | 8th Dec 1926 | Box 28 \ 2 Scan060 | |
| Technical drawing of a Rocker Shaft R7 Type RH. | 30th Jun 1930 | Box 28 \ 2 Scan061 | |
| Letter from Adamant Engineering Company regarding the supply and design modifications for a Marles steering gear. | 1st Oct 1932 | Box 28 \ 2 Scan062 | |
| Letter from Adamant Engineering discussing gear design proposals, required dimensions, a potential fouling issue, and enclosed blueprints. | 1st Oct 1932 | Box 28 \ 2 Scan063 | |
| Graph showing curves for helix angles, pitch, and gear ratio for Marles-Weller gears. | 1st Mar 1932 | Box 28 \ 2 Scan064 | |
| Graph showing gear ratios for O and Q Marles-Weller gears at various rocker shaft positions. | 5th May 1934 | Box 28 \ 2 Scan065 | |
| Feasibility of fitting a Marles steering system to a Phantom II car. | 3rd Oct 1932 | Box 28 \ 2 Scan066 | |
| Requesting drawing MGA.20100 with marked dimensions for a D-type steering column on car 58-GN. | 3rd Oct 1932 | Box 28 \ 2 Scan067 | |
| Feasibility and proposed modifications for fitting a Marles steering box to a Phantom II car. | 3rd Oct 1932 | Box 28 \ 2 Scan068 | |
| Request for drawing MGA.20100 with dimensions for the steering column on car 58-GN. | 4th Oct 1932 | Box 28 \ 2 Scan069 | |
| Letter to The Adamant Engineering Co. Ltd. discussing the suitability of a steering box, carburetter foul, and steering tube dimensions. | 4th Oct 1932 | Box 28 \ 2 Scan070 | |
| Page 2 of a letter to The Adamant Engineering Co. Ltd. regarding a central steering tube, steering box, and print MGA.20100. | 5th Oct 1932 | Box 28 \ 2 Scan071 | |
| Letter from Adamant Engineering Company regarding steering gear modifications and specifications. | 5th Oct 1932 | Box 28 \ 2 Scan072 | |
| Letter from Adamant Engineering Company Limited regarding an enclosed drawing and gear manufacture. | 5th Oct 1932 | Box 28 \ 2 Scan073 | |
| The fitting of a Marles Weller steering system to SG's car. | 6th Oct 1932 | Box 28 \ 2 Scan074 | |
| Letter to Adamant Engineering Co Ltd regarding a comparison of Cadillac and Marles Weller steering gear wear. | 10th Oct 1932 | Box 28 \ 2 Scan075 | |
| Letter from Adamant Engineering Company discussing Cadillac steering and the adjustment of Marles-Weller steering gears. | 12th Oct 1932 | Box 28 \ 2 Scan076 | |
| Letter from Adamant Engineering Company Limited discussing wear on gears and ball races. | 12th Oct 1932 | Box 28 \ 2 Scan077 | |
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