| Description | Date | Identifier | |
| Graph of Indicated Horse Power and other performance metrics for the 3 1/2 Litre Bentley engine. | 28th Nov 1934 | Box 133 \ 1 scan0206 | |
| Graph showing the Indicated and Brake Powers for a 4¼ Litre Bentley engine. | 7th Apr 1937 | Box 133 \ 1 scan0207 | |
| Graph comparing motoring losses for a 4¼ Litre Bentley engine with a standard block versus one with chromium-plated bores. | 7th Apr 1937 | Box 133 \ 1 scan0208 | |
| Graph plotting the mechanical efficiency versus RPM for a 3½ Litre Bentley engine. | 27th Jan 1934 | Box 133 \ 1 scan0209 | |
| Graph of mechanical efficiency versus RPM for a 4¼ Litre Bentley engine. | 13th Apr 1937 | Box 133 \ 1 scan0210 | |
| Graph showing a motoring loss analysis for a 3 1/2 Litre Bentley engine, plotting lost mean effective pressure against RPM. | 4th Jun 1937 | Box 133 \ 1 scan0211 | |
| Graph showing motoring loss analysis (LMEP vs RPM) for a 4 1/4 Litre Bentley engine with various components removed. | 4th Jun 1937 | Box 133 \ 1 scan0212 | |
| Graph of a motoring loss analysis showing lost horsepower versus RPM for a 3 1/2 Litre Bentley engine. | 17th May 1936 | Box 133 \ 1 scan0213 | |
| Graph showing a motoring loss analysis of a 4¼ Litre Bentley engine, plotting lost horsepower against RPM as various components are removed. | 5th Apr 1937 | Box 133 \ 1 scan0214 | |
| Graph plotting a motoring loss analysis (L.M.E.P. vs R.P.M.) of various engine components for a 3 1/2 Litre Bentley. | 5th Apr 1937 | Box 133 \ 1 scan0215 | |
| Graph detailing the motoring loss analysis and lost Mean Effective Pressure (MEP) of various components for a 4 1/4 Litre Bentley engine. | 28th Jan 1937 | Box 133 \ 1 scan0216 | |
| Graph showing motoring loss analysis and percentage losses of components for a 3 1/2 Litre Bentley engine. | 28th Jan 1937 | Box 133 \ 1 scan0217 | |
| Blueprint graph of a motoring loss analysis for a 4 1/4 Litre Bentley engine, showing percentage loss of components against RPM. | 20th May 1937 | Box 133 \ 1 scan0218 | |
| Letter to Coventry Climax Engines requesting information on the relative costs, weights, cylinder wear and oil consumption of O.H.I. versus O.H.V. type engines. | 20th May 1937 | Box 133 \ 1 scan0219 | |
| Requesting a change of the silencing system on the No. 2c Bentley S/C Unit test bed. | 25th May 1937 | Box 133 \ 1 scan0220 | |
| Build schedule and handover of a Valve Gear Rig to the millwrights. | 25th May 1937 | Box 133 \ 1 scan0221 | |
| Work schedule for the Chassis S/C Unit, detailing power checks, parts fitting and engine allocation. | 22th May 1937 | Box 133 \ 1 scan0222 | |
| Instructing the stripping of test bed No.2c to build a new valve gear rig. | 27th May 1937 | Box 133 \ 1 scan0223 | |
| Return of a borrowed B.T.H. motor and a suggested temporary setup. | 29th May 1937 | Box 133 \ 1 scan0224 | |
| Progress memo regarding the Chassis S/C Unit, including running times, urgent jobs, and parts status. | 1st Jun 1937 | Box 133 \ 1 scan0225 | |
| Request to order metering jets and spare glass gauge tubes for an Amel Mark IX flowmeter. | 3rd Jun 1937 | Box 133 \ 1 scan0226 | |
| Requesting urgent spare parts for High Power Units and providing an update on a chassis unit and valve gear rig. | 8th Jun 1937 | Box 133 \ 1 scan0227 | |
| Return of an Amal Flow meter (Mark IX) for checking new jets. | 11th Jun 1937 | Box 133 \ 1 scan0228 | |
| Work schedule for the S/C Chassis Unit, detailing component modifications and subsequent tests. | 15th Jun 1937 | Box 133 \ 1 scan0229 | |
| Request to order 7 lbs of mercury for use on the test beds. | 17th Jun 1937 | Box 133 \ 1 scan0230 | |
| Letter to Dr. J.C. Morrison of Glasgow University seeking advice on reducing power loss in engine silencing systems. | 17th Jun 1937 | Box 133 \ 1 scan0231 | |
| Page 2 of a letter to Dr. J.C. Morrison posing questions about engine power loss, exhaust, and testing methods. | 17th Jun 1937 | Box 133 \ 1 scan0232 | |
| Work schedule for an S/C Chassis Unit, detailing modifications, tests, and required spare parts. | 22th Jun 1937 | Box 133 \ 1 scan0233 | |
| The production of two covers for a Phantom III oil cooler for use on the No.2.C. Bed. | 25th Jun 1937 | Box 133 \ 1 scan0234 | |
| Letter to H.R. Ricardo confirming an offer to co-relate single cylinder work with full-scale engines. | 23th Jun 1937 | Box 133 \ 1 scan0235 | |
| Work report for a supercharged chassis unit detailing running times, planned tasks, and required spares. | 29th Jun 1937 | Box 133 \ 1 scan0236 | |
| Letter from Ricardo & Co. to W. A. Robotham arranging a meeting regarding Air Ministry research. | 26th Jun 1937 | Box 133 \ 1 scan0237 | |
| Letter to O. Thornycroft of Ricardo & Co. arranging for an assistant to visit Shoreham. | 2nd Jul 1937 | Box 133 \ 1 scan0238 | |
| Telegram received by telephone arranging a visit for an assistant. | 5th Jul 1937 | Box 133 \ 1 scan0239 | |
| Notification confirming a representative's visit to Thornycroft in Shoreham-by-Sea. | 5th Jul 1937 | Box 133 \ 1 scan0240 | |
| Post Office telegram arranging a visit for an assistant from Thornycroft. | 5th Jul 1917 | Box 133 \ 1 scan0241 | |
| Request to machine an inclined valve high power head and create a new gasket to achieve a specific compression ratio. | 6th Jul 1937 | Box 133 \ 1 scan0242 | |
| Work plan for testing and modifying an S/C chassis unit's engine components. | 6th Jul 1937 | Box 133 \ 1 scan0243 | |
| Request to clear up the faces of two tappets from a Chassis S/C Unit and have them fescolised. | 9th Jul 1937 | Box 133 \ 1 scan0244 | |
| Letter from James Watt Engineering Laboratories discussing proposed research into reducing power losses and consulting fees. | 9th Jul 1937 | Box 133 \ 1 scan0245 | |
| Proposal for experimental work to measure engine pressure variations to identify the cause of power loss. | 9th Jul 1937 | Box 133 \ 1 scan0246 | |
| Letter from John C. Morrison proposing a meeting in Derby to discuss a research project. | 28th Jun 1937 | Box 133 \ 1 scan0247 | |
| Letter from a patent agent proposing a collaboration with a university expert on exhaust manifolds. | 28th Jun 1937 | Box 133 \ 1 scan0248 | |
| Arrangements for Dr. Morrison's visit to Derby, prompted by Mr. Park of Park Ward's. | 2nd Jul 1937 | Box 133 \ 1 scan0249 | |
| Letter to Dr. J.C. Morrison discussing the use of consulting engineers versus in-house development. | 15th Jul 1937 | Box 133 \ 1 scan0250 | |
| Letter discussing power loss due to engine silencing requirements and arranging a potential visit to Derby. | 15th Jul 1937 | Box 133 \ 1 scan0251 | |
| Letter to Messrs. Cruikshank & Fairweather discussing losses in exhaust systems and performance standards. | 16th Jul 1937 | Box 133 \ 1 scan0252 | |
| Criticising Mr. Douglas Fairweather's assessment of Glasgow University Students' capacity regarding an exhaust system problem. | 16th Jul 1937 | Box 133 \ 1 scan0253 | |
| Flame movement and pressure development in gasoline engines. | 21th Jul 1937 | Box 133 \ 1 scan0254 | |
| Analysis of combustion roughness, flame propagation, and spark advance in engines. | 21th Jul 1937 | Box 133 \ 1 scan0255 | |
| The problem of flame velocity in relation to pressure and combustion. | 21th Jul 1937 | Box 133 \ 1 scan0256 | |
| The relationship between pressure and volume of combustion products, referencing Janeway's theory and adiabatic expansion. | 21th Jul 1927 | Box 133 \ 1 scan0257 | |
| Page discussing the effect of volume distribution on the position of maximum flame velocity, referencing several figures. | 21th Jul 1937 | Box 133 \ 1 scan0258 | |
| Analysis of flame velocity and pressure rise in relation to ignition position for smooth combustion. | 21th Jul 1937 | Box 133 \ 1 scan0259 | |
| Pressure-time curves and flame propagation for designing smooth combustion chambers. | 21th Jul 1937 | Box 133 \ 1 scan0260 | |
| Page describing the method for constructing a pressure-time diagram from a volume distribution curve. | 21th Jul 1937 | Box 133 \ 1 scan0261 | |
| Proposal to revive a single cylinder engine test unit for chassis engine development. | 17th May 1933 | Box 133 \ 2 scan0001 | |
| Sending blueprints for a Single Cylinder Test Unit for car engine development. | 17th Oct 1933 | Box 133 \ 2 scan0002 | |
| Accompanying drawings for a Single Cylinder Unit, detailing the contact breaker, driving discs, and camshafts. | 22th Nov 1933 | Box 133 \ 2 scan0003 | |
| Accompanying diagrams related to a Single Cylinder Test Unit. | 5th Dec 1933 | Box 133 \ 2 scan0004 | |
| Drawing LeC.3739, showing an experimental head for a single cylinder test unit which is being covered by a patent specification. | 16th Dec 1933 | Box 133 \ 2 scan0005 | |
| Material choice for the crankcase of a single-cylinder engine test unit. | 13th Feb 1934 | Box 133 \ 2 scan0006 | |
| Urgent request to supply a short cross rail and fit a Farnborough Indicator to the Kestrel Single Cylinder No. 2 Bed. | 5th Mar 1934 | Box 133 \ 2 scan0007 | |
| Test report on a 20/25 single-cylinder unit detailing performance, lubrication issues, and adjustable valve controls. | 21th Mar 1934 | Box 133 \ 2 scan0008 | |
| Oil leakage problems and outlining future engine testing work. | 21th Mar 1934 | Box 133 \ 2 scan0009 | |
| Performance graph for a 20/25 single cylinder engine. | 20th Mar 1934 | Box 133 \ 2 scan0010 | |
| Justifying the use of roller bearings over plain bearings in a 20/25 HP single cylinder unit. | 27th Mar 1934 | Box 133 \ 2 scan0011 | |
| Questioning the use of a non-standard roller bearing crankshaft in a 20/25 single cylinder test unit. | 26th Mar 1934 | Box 133 \ 2 scan0012 | |
| New inlet valve rocker for a Ramp Head single cylinder car engine test bed unit. | 9th Apr 1934 | Box 133 \ 2 scan0013 | |
| Modifications to a ramp head single cylinder car engine test unit. | 17th Apr 1934 | Box 133 \ 2 scan0014 | |
| Testing modified valves and valve sizes on a Ramp Head Single Cylinder Car Engine test unit. | 17th Apr 1934 | Box 133 \ 2 scan0015 | |
| Letter to Rudge Whitworth Motor Cycle Co. proposing a meeting to exchange engine performance data. | 11th May 1934 | Box 133 \ 2 scan0016 | |
| Letter to Norton Motor Cycle Co. Ltd. about purchasing a 500 c.c. single-cylinder racing engine for test purposes. | 19th May 1934 | Box 133 \ 2 scan0017 | |
| Letter from Norton Motors Ltd. regarding a meeting to discuss balancing equipment. | 23th May 1934 | Box 133 \ 2 scan0018 | |
| Letter to Norton Motors Ltd. arranging a works visit for a Mr. Skinner. | 24th May 1934 | Box 133 \ 2 scan0019 | |
| Letter from Rudge-Whitworth Limited regarding a 500 c.c. racing engine, with drawings and a cost estimate. | 28th May 1934 | Box 133 \ 2 scan0020 | |
| Second page of a continued letter to Rudge-Whitworth Ltd. regarding an engine order. | 29th May 1934 | Box 133 \ 2 scan0021 | |
| Proposal to purchase a Rudge-Whitworth motorcycle engine to research 4-valve cylinder heads. | 29th May 1934 | Box 133 \ 2 scan0022 | |
| Letter to Rudge-Whitworth Ltd. requesting a drawing of a test bed coupling and confirmation of a brake type. | 31th May 1934 | Box 133 \ 2 scan0023 | |
| Short memo authorising the ordering of a unit with a covering order due to an approximate price. | 31th May 1934 | Box 133 \ 2 scan0024 | |
| Proposal to purchase a Rudge-Whitworth motorcycle engine for single-cylinder research work. | 29th May 1934 | Box 133 \ 2 scan0025 | |
| Letter to Norton Motors Ltd. concerning the purchase of one of their motorcycle engines. | 7th Jun 1934 | Box 133 \ 2 scan0026 | |
| Letter from Norton Motors Ltd. regarding the purchase of one of their motorcycle engines and arranging a meeting. | 8th Jun 1934 | Box 133 \ 2 scan0027 | |
| Letter to Messrs. Norton Motors Ltd. confirming a visit on the 12th inst. | 9th Jun 1934 | Box 133 \ 2 scan0028 | |
| Letter to H.R. Ricardo regarding 4-litre Bentley cylinder head development and single-cylinder engine research. | 11th Jun 1934 | Box 133 \ 2 scan0029 | |
| Letter from Harry R. Ricardo of Ricardo & Co. to W. A. Robotham regarding the scheduling of a meeting. | 13th Jun 1934 | Box 133 \ 2 scan0030 | |
| Letter to H.R. Ricardo of Ricardo & Co. Engineers, confirming a visit. | 14th Jun 1934 | Box 133 \ 2 scan0031 | |
| Letter from Ricardo & Co., Engineers confirming a meeting with W. A. Robotham. | 18th Jun 1934 | Box 133 \ 2 scan0032 | |
| Letter from Norton Motors Ltd. confirming an agreement to supply a racing engine for experimental purposes. | 13th Jun 1934 | Box 133 \ 2 scan0033 | |
| Letter from Norton Motors Ltd. discussing engine development, experimental engines, and potential collaboration. | 13th Jun 1934 | Box 133 \ 2 scan0034 | |
| Page 3 of a letter from Norton Motors regarding a proposed collaboration on an engine. | 13th Jun 1934 | Box 133 \ 2 scan0035 | |
| Letter to Norton Motors Ltd. concerning the purchase of an engine and the limited information that can be shared from subsequent tests. | 19th Jun 1934 | Box 133 \ 2 scan0036 | |
| Letter outlining terms for a potential engine supply, covering publicity restrictions, payment, and a proposed meeting. | 19th Jun 1934 | Box 133 \ 2 scan0037 | |
| Letter from Norton Motors Ltd. regarding the loan of an engine for testing. | 21th Jun 1934 | Box 133 \ 2 scan0038 | |
| Letter to Norton Motors Ltd. arranging a meeting with their technical representatives. | 22th Jun 1934 | Box 133 \ 2 scan0039 | |
| Letter to H.R. Ricardo of Ricardo & Co. discussing a recent visit, exchanging a paper for review, and requesting prints. | 28th Jun 1934 | Box 133 \ 2 scan0040 | |
| Letter to Crossley Motors regarding a visit to discuss a side valve exhaust overhead inlet cylinder head. | 28th Jun 1934 | Box 133 \ 2 scan0041 | |
| Letter to H.R. Ricardo sending a copy of Janeway's paper for his opinion following a recent visit. | 28th Jun 1934 | Box 133 \ 2 scan0042 | |
| Letter from Crossley Motors Ltd acknowledging a previous letter and explaining a delay in response. | 2nd Jul 1934 | Box 133 \ 2 scan0043 | |
| Letter from Crossley Motors arranging a visit to discuss the Ricardo type combustion head. | 3rd Jul 1934 | Box 133 \ 2 scan0044 | |
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