| Description | Date | Identifier | |
| Blueprint showing the contour of a Woodhead special spring main leaf under torsion and load. | 10th Aug 1926 | Box 42 \ 3 Scan201 | |
| Blank document with a 'Print Room, Derby' receiving stamp. | 10th Aug 1926 | Box 42 \ 3 Scan202 | |
| Graph plotting the results of torsion tests on various front springs, showing angle of rotation against torque. | 10th Aug 1926 | Box 42 \ 3 Scan203 | |
| The reverse side of a document or photograph with a Print Room receipt stamp. | 10th Aug 1926 | Box 42 \ 3 Scan204 | |
| Comparing reversed and rebound leaf springs fitted to Lancia and Bentley vehicles. | 10th Aug 1926 | Box 42 \ 3 Scan205 | |
| Graph showing the relationship between deflection and total spring load for Lancia reversed leaf springs. | 10th Aug 1926 | Box 42 \ 3 Scan206 | |
| Blank document page featuring a red ink date stamp from the Derby office. | 10th Aug 1926 | Box 42 \ 3 Scan207 | |
| Performance graph showing the compression versus load for a Woodhead Special Spring D. | 10th Aug 1926 | Box 42 \ 3 Scan208 | |
| Severely faded document with a red rectangular received stamp. | 10th Aug 1926 | Box 42 \ 3 Scan209 | |
| Design of riveted-on road spring clips for the 40/50 and 20 HP models. | 3rd May 1927 | Box 42 \ 3 Scan210 | |
| Design, testing, and production of riveted spring clips. | 6th May 1927 | Box 42 \ 3 Scan211 | |
| Test results and proposed modifications for a rebound leaf spring. | 13th May 1927 | Box 42 \ 3 Scan212 | |
| The testing of special Woodhead front springs with rubber pads, including bumper test results and weight comparisons. | 24th Jul 1928 | Box 42 \ 3 Scan213 | |
| Spring durability, manufacturing methods, and solutions for squeaking. | 24th Jul 1928 | Box 42 \ 3 Scan214 | |
| Blueprint of a 'Woodhead Special' leaf spring detailing break locations and rubber inserts. | 26th Jul 1928 | Box 42 \ 3 Scan215 | |
| Blank document page with a Print Room stamp. | 26th Jul 1928 | Box 42 \ 3 Scan216 | |
| Letter from Jonas Woodhead & Sons Ltd. regarding the testing of special laminated springs. | 16th Aug 1928 | Box 42 \ 3 Scan217 | |
| Letter to J. Woodhead & Sons Ltd. regarding spring deflection and rebound testing. | 20th Aug 1928 | Box 42 \ 3 Scan218 | |
| Letter from Jonas Woodhead & Sons Ltd. regarding test results for springs with rubber inserts. | 21th Aug 1928 | Box 42 \ 3 Scan219 | |
| Design of road springs, including plate ends, clips, and types like cantilever and semi-elliptic. | 2nd Oct 1928 | Box 42 \ 3 Scan220 | |
| Proposal to return to the Woodhead clip for road springs and an associated design issue. | 10th Oct 1928 | Box 42 \ 3 Scan221 | |
| Receipt of sample 20 HP low rating type Axle Springs from Jonas Woodhead & Sons for testing. | 12th Aug 1932 | Box 42 \ 3 Scan222 | |
| Letter to Jonas Woodhead & Sons regarding the testing of their road springs and issues with lubricant. | 5th Nov 1932 | Box 42 \ 3 Scan223 | |
| Test report comparing Woodhead low rating road springs against standard Firths springs on a 25HP bumper chassis. | 5th Nov 1932 | Box 42 \ 3 Scan224 | |
| Lubricant issues with rear springs and plans for testing new Woodhead springs. | 5th Nov 1932 | Box 42 \ 3 Scan225 | |
| Letter from Jonas Woodhead & Sons about a new design for spring plate ends to aid lubrication and prevent squeaking. | 7th Nov 1932 | Box 42 \ 3 Scan226 | |
| Design and manufacturing specifications for experimental Woodhead springs. | 7th Nov 1932 | Box 42 \ 3 Scan227 | |
| Request to order a set of 4 low rating Peregrine road springs from Messrs Woodhead. | 28th Dec 1932 | Box 42 \ 3 Scan228 | |
| Complaints that Dermatine washers are inferior and a proposal to test a thicker version. | 25th Aug 1919 | Box 42 \ 4 Scan001 | |
| Notice concerning the standardization of thicker Dermative washers for the chassis. | 30th Mar 1920 | Box 42 \ 4 Scan002 | |
| Issues with current spring washers and proposing a new standardised design. | 20th Oct 1920 | Box 42 \ 4 Scan003 | |
| Request for a set of sample washers to be sent to Mr. Royce for inspection. | 20th Oct 1920 | Box 42 \ 4 Scan004 | |
| Failure of 2.BA Grover spring washers and seeking comments on potential solutions. | 15th Dec 1920 | Box 42 \ 4 Scan005 | |
| Standardization of spring washers and the removal of certain standard nut sizes. | 1st Jun 1922 | Box 42 \ 4 Scan006 | |
| Approval and testing of spring washer samples from Messrs. C. R. Smithson & Co. | 29th Jun 1922 | Box 42 \ 4 Scan007 | |
| Letter regarding the dispatch of sample spring washers for testing and standardization. | 14th Jul 1922 | Box 42 \ 4 Scan008 | |
| Ackermite Pivot Washers and the forwarding of contemplated alterations. | 10th Aug 1923 | Box 42 \ 4 Scan009 | |
| Letter discussing the use and performance of a material named Ackermite for pivot washers. | 28th Jul 1925 | Box 42 \ 4 Scan010 | |
| Replacement of fibre washers with aluminium washers. | 3rd Mar 1926 | Box 42 \ 4 Scan011 | |
| Use of aluminium washers in place of fibre washers for drain pipe unions. | 8th Mar 1926 | Box 42 \ 4 Scan012 | |
| Servo jaggers and the use of a rubber washer from the Phantom model on the 20HP model, suggesting a more permanent steel version. | 22th Apr 1926 | Box 42 \ 4 Scan013 | |
| Requesting an urgent experimental trial of petrol-proof rubber washers for a 20-HP chassis petrol tank. | 3rd May 1926 | Box 42 \ 4 Scan014 | |
| Quotation from The Avon India Rubber Co. Ltd. for the supply of washers. | 27th Apr 1926 | Box 42 \ 4 Scan015 | |
| Recommendation to replace cork washers with rubber washers for the petrol level indicator. | 1st Jul 1926 | Box 42 \ 4 Scan016 | |
| Replacement of fibre washers with aluminium washers, specifically for hydraulic shock dampers. | 23th Dec 1926 | Box 42 \ 4 Scan017 | |
| Order for Ferobestos clutch washers for an experimental 20 HP starter motor. | 31th Oct 1927 | Box 42 \ 4 Scan018 | |
| Request to order two cork washers with specified dimensions for the Phantom slipper wheel. | 8th Jun 1928 | Box 42 \ 4 Scan019 | |
| Requesting an increase in the area and hardness of washers for a centralised lubrication system. | 1st Aug 1928 | Box 42 \ 4 Scan020 | |
| Trouble with aluminium washers in the centralized lubrication system causing oil leaks. | 14th Jul 1928 | Box 42 \ 4 Scan021 | |
| Explaining the correct application and function of double tab locking washers on chassis and aero engines. | 7th Sep 1928 | Box 42 \ 4 Scan022 | |
| Design and material of locking washers for propeller boss bolt nuts. | 12th Sep 1928 | Box 42 \ 4 Scan023 | |
| Correcting the word 'ineffective' to 'effective' in a previous communication about tab locking washers. | 13th Sep 1928 | Box 42 \ 4 Scan024 | |
| Recommending modifications to the R engine's oil base fastening and standardizing the use of grover washers for aero work. | 6th Jul 1929 | Box 42 \ 4 Scan025 | |
| Request for the production of eighteen mild steel (M.S.) washers with specified dimensions. | 13th Aug 1929 | Box 42 \ 4 Scan026 | |
| Cover letter for an attached document from R.D.E.2.b. concerning the fitting of restriction washers in aircraft. | 30th Nov 1929 | Box 42 \ 4 Scan027 | |
| Letter from the Air Ministry agreeing to fit restriction washers to 'F' type engines in specific aircraft. | 20th Nov 1929 | Box 42 \ 4 Scan028 | |
| Report from the Marine Aircraft Experimental Establishment on the unsuitability of soft aluminium sparking plug washers. | 1st Dec 1931 | Box 42 \ 4 Scan029 | |
| The corrosion tests of sparking plugs and the use of solid aluminium washers. | 1st Dec 1931 | Box 42 \ 4 Scan030 | |
| Two photographs, Figures 1 and 2, showing different types of metal washers or rings. | 9th Dec 1931 | Box 42 \ 4 Scan031 | |
| Photographic record of aluminium sparking plug washers. | 9th Dec 1931 | Box 42 \ 4 Scan032 | |
| Further tests of solid type aluminium sparking plug washers from the Marine Aircraft Experimental Establishment in Felixstowe. | 1st Apr 1933 | Box 42 \ 4 Scan033 | |
| Page two of a Felixstowe report comparing the performance of aluminium and copper/asbestos washers on engines. | 1st Apr 1933 | Box 42 \ 4 Scan034 | |
| Test report table detailing the performance and condition of plugs in various aircraft and marine engines. | 27th Apr 1927 | Box 42 \ 4 Scan035 | |
| Photograph showing two metal washers or grommets. | 27th Apr 1927 | Box 42 \ 4 Scan036 | |
| Photographic report cover sheet regarding aluminium sparking plug washers. | 12th Apr 1933 | Box 42 \ 4 Scan037 | |
| Standardisation of parts report for a Vellumoid Rocker Cover Washer. | 20th Dec 1933 | Box 42 \ 4 Scan038 | |
| Modifications to the Phantom cylinder head, comparing different combustion head designs and engine types. | 6th Mar 1926 | Box 42 \ 4 Scan039 | |
| Engine combustion turbulence, comparing various cylinder head, piston, and valve designs. | 6th Mar 1926 | Box 42 \ 4 Scan040 | |
| Continued discussion on engine design, focusing on cam grinding, turbulence, and cylinder head configurations. | 1st May 1926 | Box 42 \ 4 Scan041 | |
| Response to a complaint about a Phantom engine firing after being switched off, comparing it to the 40/50 HP Silver Ghost. | 1st May 1926 | Box 42 \ 4 Scan042 | |
| Letter from the University of Bristol's Department of Automobile Engineering asking for information on engine detonation and anti-knock agents. | 3rd Sep 1926 | Box 42 \ 4 Scan043 | |
| Page 2 of a letter to E. W. Hives asking about the effect of engine size on detonation. | 21th Sep 1926 | Box 42 \ 4 Scan044 | |
| Letter to Professor W. Morgan of the University of Bristol regarding enquiries on engine detonation. | 21th Sep 1926 | Box 42 \ 4 Scan045 | |
| Engine detonation concerning compression ratios, fuel mixtures, and ignition. | 21th Sep 1926 | Box 42 \ 4 Scan046 | |
| Analysis of engine detonation related to ignition timing, number of plugs, and cylinder bore size. | 22th Sep 1926 | Box 42 \ 4 Scan047 | |
| Letter from the University of Bristol's Department of Automobile Engineering regarding research into detonation. | 22th Sep 1926 | Box 42 \ 4 Scan048 | |
| Confirming a suggestion to use a single lip on a turbulent Phantom cylinder head for better flow. | 28th Oct 1926 | Box 42 \ 4 Scan049 | |
| Test report on different 'turbulent' type cylinder heads for the lighter Phantom engine to address detonation issues. | 10th Dec 1926 | Box 42 \ 4 Scan050 | |
| Report page discussing engine detonation, turbulence, and ignition tests comparing an original aluminium head with an alternative head on a Phantom engine. | 10th Dec 1926 | Box 42 \ 4 Scan051 | |
| Increasing Mean Effective Pressure (MEP) by testing a new engine head, detailing compression ratios, detonation, and ignition characteristics. | 10th Dec 1926 | Box 42 \ 4 Scan052 | |
| Report page detailing engine timing, detonation reduction, and self-ignition tests. | 10th Dec 1926 | Box 42 \ 4 Scan053 | |
| Engine self-ignition tendencies and experiments conducted with smaller valves. | 10th Dec 1926 | Box 42 \ 4 Scan054 | |
| Summary of test results on the lighter Phantom engine, comparing power output, ignition, and detonation with different valve sizes. | 10th Dec 1926 | Box 42 \ 4 Scan055 | |
| Preparations for road and bench tests on three different types of cylinder heads. | 10th Dec 1926 | Box 42 \ 4 Scan056 | |
| Graph showing Ignition Advance versus Brake Mean Effective Pressure (B.M.E.P.) curves at 1000 RPM. | 11th Dec 1920 | Box 42 \ 4 Scan057 | |
| The reverse of a document showing a 'Print Room' stamp from Derby. | 11th Dec 1920 | Box 42 \ 4 Scan058 | |
| Graph of ignition advance curves for various Phantom engine configurations. | 2nd Dec 1924 | Box 42 \ 4 Scan059 | |
| Graph comparing power output (BHP and BMEP) for an Aluminium Phantom engine with large versus small diameter valves. | 6th Jun 1924 | Box 42 \ 4 Scan060 | |
| Ignition Advance/B.M.E.P. curves for an Aluminium Phantom engine at 1000 RPM. | 11th Dec 1926 | Box 42 \ 4 Scan061 | |
| The reverse of a document with a red ink stamp from the Printing Room. | 11th Dec 1926 | Box 42 \ 4 Scan062 | |
| Blueprint for smaller diameter inlet and exhaust valves for a Lighter Phantom Engine. | 27th Nov 1926 | Box 42 \ 4 Scan063 | |
| Heavily faded and almost entirely illegible typed document with a red ink stamp in the bottom right corner. | 11th Dec 1936 | Box 42 \ 4 Scan064 | |
| Lightening the Phantom engine's waterpipe, flywheel and clutch, and improving the induction system. | 1st Feb 1927 | Box 42 \ 4 Scan065 | |
| Ricardo's remarks on engine roughness caused by high compression and the challenges of altering combustion chamber design. | 24th Feb 1927 | Box 42 \ 4 Scan066 | |
| Piston designs and compression ratios for F engines. | 24th Jun 1927 | Box 42 \ 4 Scan067 | |
| Performance of turbulent cylinder heads and low-speed acceleration, particularly in the Peregrine engine. | 3rd Oct 1932 | Box 42 \ 4 Scan068 | |
| Three graphs comparing the BMEP vs RPM of 'Japan I' and 'Peregrine' engines, with and without detonation, using Shell Mex fuel. | 20th Aug 1919 | Box 42 \ 4 Scan069 | |
| Suggestion for a side petrol filler to address difficulties when a luggage carrier is in use. | 20th Aug 1919 | Box 42 \ 4 Scan070 | |
| Design and positioning of a petrol gauge and filler in relation to a luggage carrier. | 28th Jan 1920 | Box 42 \ 4 Scan071 | |
| Extract discussing a modification to the carburettor's flat feed chamber to incorporate a filter for a new back tank. | 28th Jan 1920 | Box 42 \ 4 Scan072 | |
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