| Description | Date | Identifier | |
| Graph showing the ignition advance that causes audible detonation at constant speed and full load, comparing standard and long duration cams. | 15th Aug 1919 | Box 66a \ 2 scan0228 | |
| Graph comparing the performance (B.HP vs R.P.M.) of a standard and an experimental camshaft on a Standard Phantom engine. | 15th Aug 1919 | Box 66a \ 2 scan0229 | |
| Proposal for using rollerless tappets and a new cam form for the Sports Phantom model. | 17th Sep 1927 | Box 66a \ 2 scan0230 | |
| Performance comparison report between standard and long duration camshafts, detailing hill climb and acceleration tests. | 20th Oct 1927 | Box 66a \ 2 scan0231 | |
| Material choice and design for camshaft bearings. | 9th Mar 1928 | Box 66a \ 2 scan0232 | |
| Request to use standard rocker covers instead of thin wall types on aluminium heads to reduce tappet noise. | 1st Apr 1928 | Box 66a \ 2 scan0233 | |
| Confirming a verbal request to use standard rocker covers over thin-wall types due to increased tappet noise. | 1st Apr 1928 | Box 66a \ 2 scan0234 | |
| Phantom rocker brackets, recommending a return to all-steel versions due to uneven expansion issues. | 12th Jul 1928 | Box 66a \ 2 scan0235 | |
| Material change for Phantom engine rocker shaft brackets due to thermal expansion issues. | 12th Jul 1928 | Box 66a \ 2 scan0236 | |
| Material change for valve rocker brackets on the Phantom engine. | 13th Jul 1928 | Box 66a \ 2 scan0237 | |
| Diagnosing and curing an elusive squeak or note in the engine, caused by the oil pump gears. | 30th Oct 1928 | Box 66a \ 2 scan0238 | |
| Depot sheet recommendation concerning tappet adjustment for Phantom F.2.B. series engines with aluminium cylinder heads. | 1st Nov 1928 | Box 66a \ 2 scan0239 | |
| Standardisation of a Phantom Rocker Cover to prevent it from working loose and to create an oil-tight joint. | 25th Sep 1928 | Box 66a \ 2 scan0240 | |
| Fitting of a new part to an H series chassis, including the test date and associated costs. | 28th Jan 1929 | Box 66a \ 2 scan0241 | |
| Practical considerations for camshaft design, including valve lift, floating speed, and valve lift curves. | 20th Dec 1928 | Box 66a \ 2 scan0242 | |
| Harmonic camshafts, valve spring forces, and modifications to reduce valve gear clatter. | 29th Dec 1928 | Box 66a \ 2 scan0243 | |
| Suggestion to simplify mathematical expressions for cam lift using sinusoidal functions. | 29th Dec 1928 | Box 66a \ 2 scan0244 | |
| Blueprint for a combustion chamber model, detailing various sections and spark plug positioning. | 21th May 1935 | Box 66a \ 3 scan0001 | |
| Drawing LeC.1990 which details a revised magneto coupling with a friction cone adjustment. | 2nd Jul 1924 | Box 66a \ 3 scan0002 | |
| Requesting suggestions for the shape and size of a mirror for viewing contact breaker points on the 40/50 model. | 18th Aug 1924 | Box 66a \ 3 scan0003 | |
| Proposal to adapt a friction drum type of adjustment for the magneto coupling on the EAG.2. | 13th Jan 1925 | Box 66a \ 3 scan0004 | |
| Revised magneto coupling designs and Mr. Royce's preferences. | 28th Jan 1925 | Box 66a \ 3 scan0005 | |
| Blue-print for a taper Magneto Drive and the progress on a set of Undershields. | 26th Feb 1925 | Box 66a \ 3 scan0006 | |
| Secret document detailing proposed modifications to improve the oil retaining device on a dynamo drive. | 3rd Mar 1925 | Box 66a \ 3 scan0007 | |
| Recommendation to try a specific scheme with a particular nut due to its sensitivity to end location. | 3rd Mar 1925 | Box 66a \ 3 scan0008 | |
| Secret memo regarding a drawing for a Dynamo Drive Oil Retainer. | 4th Mar 1925 | Box 66a \ 3 scan0009 | |
| Modification to the dynamo drive to cure a rattle, referencing drawing LeC.2028. | 17th Mar 1925 | Box 66a \ 3 scan0010 | |
| Secret memo discussing design modifications for an anti-rattle dynamo drive. | 1st Apr 1925 | Box 66a \ 3 scan0011 | |
| Secret memo regarding the design of the Dynamo Drive carrier shaft spring. | 15th Apr 1925 | Box 66a \ 3 scan0012 | |
| Alteration document for a modified Hardy fabric coupling used for dynamo and magneto drives on aero engines. | 24th Sep 1926 | Box 66a \ 3 scan0013 | |
| Magneto drive slip and camshaft drive failure, with proposed solutions. | 16th Oct 1926 | Box 66a \ 3 scan0014 | |
| Requesting the creation of parts for engine mountings and a test rig adaptor, with a query about sourcing different fabric discs. | 3rd Oct 1926 | Box 66a \ 3 scan0015 | |
| To Mr. Hancock regarding the Dynamo Drive - Damping Brake. | 25th May 1927 | Box 66a \ 3 scan0016 | |
| Lubrication issue with the Phantom ignition control countershaft lever. | 31th May 1927 | Box 66a \ 3 scan0017 | |
| Sports Phantom magneto bracket, noting a change in tilt angle. | 13th Oct 1927 | Box 66a \ 3 scan0018 | |
| Design options for the dynamo drive due to pressure of work. | 21th Jan 1928 | Box 66a \ 3 scan0019 | |
| Positioning of the EAC.10 Magneto Drive in relation to the Phantom model. | 2nd Feb 1923 | Box 66a \ 3 scan0020 | |
| Page 2 of a memo regarding a spring and ball thrust mechanism used to manage water leakage. | 2nd Feb 1923 | Box 66a \ 3 scan0021 | |
| Sales brochure for the Maybach 12 Cylinder Type Zeppelin, with a list of branch offices and agencies. | 2nd Feb 1923 | Box 66a \ 3 scan0022 | |
| Specification page for the Maybach 12 Type Zeppelin car detailing its springs, brakes, instruments, and body styles. | 2nd Feb 1923 | Box 66a \ 3 scan0023 | |
| Promotional brochure for the Maybach 12 Type Zeppelin car, detailing its features and specifications. | 14th Jun 1924 | Box 66a \ 3 scan0024 | |
| New design scheme for a throttle governor after a previous version was cancelled. | 14th Jun 1924 | Box 66a \ 3 scan0025 | |
| Of a throttle governor scheme and the required alterations. | 6th Jun 1924 | Box 66a \ 3 scan0026 | |
| Test on engine throttle movement and the resulting horsepower at various RPMs. | 26th Jun 1924 | Box 66a \ 3 scan0027 | |
| Alterations to engine controls for the addition of a throttle governor, referencing specific drawings and requesting a new spring. | 30th Jun 1924 | Box 66a \ 3 scan0028 | |
| Alterations for the addition of a throttle governor carburetter, referencing drawing No.LeC.1888. | 1st Jul 1924 | Box 66a \ 3 scan0029 | |
| Requesting a critique of a report on the EAC Throttle Governor and its comparison to the 40/50 HP model. | 1st Jan 1925 | Box 66a \ 3 scan0030 | |
| Comparison of the functioning of the EAC and 40/50 HP throttle governors. | 1st Jan 1925 | Box 66a \ 3 scan0031 | |
| Mathematical analysis of the behavior of 40/50 & EAC governors. | 1st Jan 1925 | Box 66a \ 3 scan0032 | |
| Comparison of the EAC and 40/50 throttle governors, detailing their respective pull, movement, and performance characteristics. | 1st Jan 1925 | Box 66a \ 3 scan0033 | |
| Comparison of governor sensitivity and the mechanics of springs required for adjustment. | 1st Jan 1925 | Box 66a \ 3 scan0034 | |
| The inconsistency of the governor's performance at reasonable road speeds. | 1st Jan 1925 | Box 66a \ 3 scan0035 | |
| Technical note on the tendencies and performance of the 40/50 type governor throttle. | 1st Jan 1925 | Box 66a \ 3 scan0036 | |
| Recommendations for alterations to the EAC throttle governor, including diagrams. | 1st Jan 1925 | Box 66a \ 3 scan0037 | |
| Secret memo discussing the design of the throttle governor for the EAC model, comparing it to the 40/50 chassis. | 1st Jan 1925 | Box 66a \ 3 scan0038 | |
| Data sheet with graphs showing performance characteristics of the E.A.C. Throttle Governor. | 23th Jan 1925 | Box 66a \ 3 scan0039 | |
| Trial and implementation of a direct governor control butterfly throttle. | 29th Jan 1925 | Box 66a \ 3 scan0040 | |
| Analysing issues with the EAC throttle governor's heavy hand control. | 9th Feb 1925 | Box 66a \ 3 scan0041 | |
| The mechanics of a throttle controlling spring, butterfly throttle, and governor control. | 11th Feb 1925 | Box 66a \ 3 scan0042 | |
| Specifying the requirements for a torsional spring for a throttle governor. | 11th Feb 1925 | Box 66a \ 3 scan0043 | |
| Graph comparing new and existing throttle governor cams based on angular movement and throttle opening. | 13th Jan 1944 | Box 66a \ 3 scan0044 | |
| New design for the throttle governor and requesting valve opening information. | 2nd Feb 1925 | Box 66a \ 3 scan0045 | |
| Secret memo detailing a modification to the E.A.C. Adjustable Throttle Lever, referencing drawing LsC.2011. | 3rd Mar 1925 | Box 66a \ 3 scan0046 | |
| Requesting the design of a new butterfly throttle closing spring. | 16th Mar 1925 | Box 66a \ 3 scan0047 | |
| Modification to a throttle governor, focusing on the selection of a spring with a different load rating. | 20th Mar 1925 | Box 66a \ 3 scan0048 | |
| Secret memo discussing modifications and issues with a throttle governor control system. | 23th Mar 1925 | Box 66a \ 3 scan0049 | |
| Secret memo discussing the design and testing of a throttle governor control. | 26th Mar 1925 | Box 66a \ 3 scan0050 | |
| Issues with the throttle governor return spring and an anti-rattling device. | 28th Mar 1925 | Box 66a \ 3 scan0051 | |
| Secret memo from E. to Hs. discussing modifications to the throttle governor spring and generator drive. | 30th Mar 1925 | Box 66a \ 3 scan0052 | |
| Error in placing a spring for the throttle camshaft, requesting a modified spring be fitted and tested. | 30th Mar 1925 | Box 66a \ 3 scan0053 | |
| Blueprint scheme for a return spring on a throttle governor. | 30th Mar 1925 | Box 66a \ 3 scan0054 | |
| Proposed modification to the 'V' Series accelerator control to address wear issues and ensure full throttle movement. | 4th Mar 1925 | Box 66a \ 3 scan0055 | |
| Tests and alterations made to an E.A.C. throttle governor to improve its performance. | 21th Apr 1925 | Box 66a \ 3 scan0056 | |
| Butterfly throttle load issues at low speeds and potential solutions involving control levers. | 21th Apr 1925 | Box 66a \ 3 scan0057 | |
| Investigating high-speed lag, attributing it to camshaft friction and proposing solutions like ball bearings. | 21th Apr 1925 | Box 66a \ 3 scan0058 | |
| Throttle governor road tests. | 21th Apr 1925 | Box 66a \ 3 scan0059 | |
| Graph comparing the performance of a new throttle governor cam against an existing one (L.E.C. 1889). | 13th Jan 1924 | Box 66a \ 3 scan0060 | |
| Comparison of two throttle governor control lever arrangements to reduce the load on the hand control. | 18th Apr 1925 | Box 66a \ 3 scan0061 | |
| Graphs detailing performance data for the E.A.C. Throttle Governor. | 1st Jan 1925 | Box 66a \ 3 scan0062 | |
| Design and analysis of a modified throttle control spring for a 20 HP engine, including diagrams and performance graphs. | 20th Apr 1925 | Box 66a \ 3 scan0063 | |
| The improvement from using ball bearings on the throttle governor control shaft. | 1st Apr 1925 | Box 66a \ 3 scan0064 | |
| Investigations into the EAC throttle governor, detailing improvements from fitting ball bearings to the camshaft. | 1st Apr 1925 | Box 66a \ 3 scan0065 | |
| Secret memo regarding the throttle governor, discussing friction in ball bearings and comparing accelerator pedal travel across different car models. | 27th Apr 1925 | Box 66a \ 3 scan0066 | |
| Instructions for setting the throttle governor for EAC throttles using a specific device. | 28th Apr 1925 | Box 66a \ 3 scan0067 | |
| Blueprint detailing an arm for setting the E.A.C. throttle with specific assembly instructions. | 30th Apr 1925 | Box 66a \ 3 scan0068 | |
| Instruction sheet for setting the control rod from the governor. | 30th Apr 1925 | Box 66a \ 3 scan0069 | |
| Instructions for setting the F.A.C. throttle governor operating roller using a spirit level. | 30th Apr 1925 | Box 66a \ 3 scan0070 | |
| Sending instructions and a device for setting the throttle governor. | 28th Apr 1925 | Box 66a \ 3 scan0071 | |
| Instructions for setting the E.A.C. throttle governor operating roller. | 30th Apr 1925 | Box 66a \ 3 scan0072 | |
| Instructions for setting the control rod from the governor. | 10th Apr 1925 | Box 66a \ 3 scan0073 | |
| Blueprint of an arm for setting the E.A.C. throttle in the correct position relative to a roller. | 30th Apr 1925 | Box 66a \ 3 scan0074 | |
| Graph comparing throttle governor performance for the 40/50 model with three different camshaft schemes. | 29th Apr 1925 | Box 66a \ 3 scan0075 | |
| Secret memo regarding a 'V' Series Throttle Governor design incorporating Skefco ball bearings. | 29th Apr 1925 | Box 66a \ 3 scan0076 | |
| Secret memo regarding two alternative designs for a throttle governor control mechanism. | 29th Apr 1925 | Box 66a \ 3 scan0077 | |
| Device for setting the throttle governor and a suggestion for testing oil relays. | 1st May 1925 | Box 66a \ 3 scan0078 | |
| Authorisation sheet for a modification to the R.A.C. Throttle Governor. | 4th May 1925 | Box 66a \ 3 scan0079 | |
| Note confirming receipt of C.J.'s consent for Authorisation Sheet No.2 regarding the E.A.C. Throttle Governor. | 7th May 1925 | Box 66a \ 3 scan0080 | |
| Governor control levers coming loose on two cars, with a proposal to increase the bolt size. | 1st Jul 1925 | Box 66a \ 3 scan0081 | |
| Investigation into explosions in the silencer of the Phantom model, comparing it to the Silver Ghost. | 8th Aug 1926 | Box 66a \ 3 scan0082 | |
| Throttle bearing friction and comparing engine explosions in Hispano and Lancia cars. | 8th Aug 1926 | Box 66a \ 3 scan0083 | |
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