| Description | Date | Identifier | |
| 10,000-mile test report on the performance of vehicle components AI & IV. | 14th Dec 1934 | Box 5a \ 4 04-page176 | |
| Condition report on various vehicle components including connecting rods, clutch, engine mounting, gearbox, servo motor, and propeller shaft. | 14th Dec 1934 | Box 5a \ 4 04-page177 | |
| Technical report on the performance and condition of various car components including the carburettor, exhaust, steering, and engine parts. | 14th Dec 1934 | Box 5a \ 4 04-page178 | |
| Inspection report detailing the condition and faults of various vehicle components after mileage. | 14th Dec 1934 | Box 5a \ 4 04-page179 | |
| Test report detailing the performance and failures of various vehicle components. | 14th Dec 1934 | Box 5a \ 4 04-page180 | |
| Performance and failures of various vehicle components including the dynamo, battery, bodywork, and windscreen wiper. | 14th Dec 1934 | Box 5a \ 4 04-page181 | |
| Report page detailing lubrication, a dismantled front engine mounting, car weight, and tyre mileage. | 14th Dec 1934 | Box 5a \ 4 04-page182 | |
| The performance and condition of D.W.S. lightened type jacks. | 15th Dec 1934 | Box 5a \ 4 04-page183 | |
| Technical memo detailing issues with a carburettor, silencer, dampers, and progress on a 10,000-mile test. | 15th Dec 1934 | Box 5a \ 4 04-page184 | |
| Typed letter discussing vehicle performance observations and requesting further tests. | 18th Dec 1934 | Box 5a \ 4 04-page185 | |
| Examination of lead bronze bearings and proposing the standardization of a larger oil pump modification. | 17th Dec 1934 | Box 5a \ 4 04-page186 | |
| Christmas holiday arrangements for staff and the temporary storage of vehicle 21-G.IV. | 17th Dec 1934 | Box 5a \ 4 04-page187 | |
| Invoice from The British Tyre and Rubber Co. Ltd. for a sheet of rubber, confirming it may be paid for. | 18th Dec 1934 | Box 5a \ 4 04-page188 | |
| Issues with inserting the starting handle due to rubber engine mountings and a solution for engine movement under torque. | 18th Dec 1934 | Box 5a \ 4 04-page189 | |
| Correcting a lap speed figure in a daily report. | 16th Dec 1934 | Box 5a \ 4 04-page190 | |
| Difficulty engaging the starting handle on the 20/25 10,000 miles car. | 19th Dec 1934 | Box 5a \ 4 04-page191 | |
| Letter reporting the cause of a starting handle engagement issue on engine 21 G IV and its temporary fix. | 10th Dec 1934 | Box 5a \ 4 04-page192 | |
| Blueprint of the off-side tube profile, indicating the front bearing and bending point. | 10th Dec 1934 | Box 5a \ 4 04-page193 | |
| Blueprint detailing the underside of an engine support tube. | 19th Dec 1934 | Box 5a \ 4 04-page194 | |
| Engine oil pressure tests and a fix for oil loss from a rear bearing. | 19th Dec 1934 | Box 5a \ 4 04-page195 | |
| Crankcase pressure tests and ignition timing adjustments. | 19th Dec 1934 | Box 5a \ 4 04-page196 | |
| Technical drawing of a friction damper mounted on a cylinder head. | 15th Dec 1934 | Box 5a \ 4 04-page197 | |
| Photograph showing the condition of main bearings from vehicle 21GIV after 10,000 miles in France. | 15th Dec 1934 | Box 5a \ 4 04-page198 | |
| Photograph showing the condition of main bearings after 10,000 miles in France. | 15th Dec 1934 | Box 5a \ 4 04-page199 | |
| Photograph of lead bronze connecting rod bearings after a 10,000-mile test in France. | 15th Dec 1934 | Box 5a \ 4 04-page200 | |
| Photograph showing lead bronze connecting rod bearings after 10,000 miles. | 15th Dec 1934 | Box 5a \ 4 04-page201 | |
| Difficulty with the starting handle on a 20/25 model and improvements to the suspension tubes. | 22th Dec 1934 | Box 5a \ 4 04-page202 | |
| Car repairs and part fittings in Chateauraux, France. | 30th Dec 1934 | Box 5a \ 4 04-page203 | |
| Typed memo about fitting piston rings and torque reaction dampers, and waiting for the Paris Depot to reopen to get bushes fitted. | 31th Dec 1936 | Box 5a \ 4 04-page204 | |
| Letter to G.W. Hancock regarding a report of clutch slip on a 20/25 model. | 1st Jan 1935 | Box 5a \ 4 04-page205 | |
| Clarifying car roughness issues, speedometer accuracy, and requesting the return of a spare servo. | 1st Jan 1935 | Box 5a \ 4 04-page206 | |
| Telegram received by telephone reporting the inability to source a high compression cylinder head. | 3rd Jan 1935 | Box 5a \ 4 04-page207 | |
| Correspondence arranging a trial of a Cadillac with a modified 20/25 carburetter and new K.L.G. spark plugs in France. | 4th Jan 1935 | Box 5a \ 4 04-page208 | |
| Change of material for a breaking wheelcase stud on a 20/25 HP chassis. | 4th Jan 1935 | Box 5a \ 4 04-page209 | |
| Failure of a drilled stud on the wheelcase and a dynamo charge issue. | 5th Jan 1935 | Box 5a \ 4 04-page210 | |
| Responding to a query about clutch slipping, detailing the circumstances of the issue. | 6th Jan 1935 | Box 5a \ 4 04-page211 | |
| Return of a crinkly plate servo and clarifying speedometer readings against checked distances. | 6th Jan 1935 | Box 5a \ 4 04-page212 | |
| Confirming the receipt and fitting of 8 KLG sparking plugs type KI/859. | 11th Jan 1935 | Box 5a \ 4 04-page213 | |
| The trial and comparison of a Cadillac and a 21-G-IV car in France. | 14th Jan 1925 | Box 5a \ 4 04-page214 | |
| Report comparing Cadillac vehicle performance, particularly its steering and suspension, against Rolls-Royce models. | 14th Jan 1936 | Box 5a \ 4 04-page215 | |
| Comparison of coachbuilding methods, noting the use of steel in French and American bodies. | 14th Jan 1935 | Box 5a \ 4 04-page216 | |
| Repairing a broken exhaust pipe and experimenting with an auxiliary breather to reduce oil consumption. | 14th Jan 1935 | Box 5a \ 4 04-page217 | |
| Issuing a Standardisation Sheet for the 25 HP Servo, covering torsional connections, spring rings, bearings, cams and linings. | 15th Jan 1935 | Box 5a \ 4 04-page218 | |
| Letter detailing arrangements for a comparative test of a Cadillac against a 20/25 model, and the associated logistics. | 16th Jan 1935 | Box 5a \ 4 04-page219 | |
| Arrangements for tests in France of a Cadillac and a 21-G-IV by London Coachbuilders. | 16th Jan 1935 | Box 5a \ 4 04-page220 | |
| Urgent memo arranging a visit for coachbuilders to France to test a Cadillac and car 21-0-4. | 14th Jan 1935 | Box 5a \ 4 04-page221 | |
| The poor test results of S.4947 linings compared to VM.30, leading to the discontinuation of testing. | 15th Jan 1935 | Box 5a \ 4 04-page222 | |
| Tests in France on Cadillac & 21-G-IV cars by London Coachbuilders. | 19th Jan 1935 | Box 5a \ 4 04-page223 | |
| Letter to coachbuilder Park Ward & Co. Ltd. discussing chassis stiffness, coachwork rigidity, and steel panelling. | 2nd Feb 1935 | Box 5a \ 4 04-page224 | |
| Recommending a modification to the windscreen wiper motor mounting following successful tests in France. | 4th Feb 1935 | Box 5a \ 4 04-page225 | |
| Testing of a 20/25 car in London traffic and the fitting of a new steering ratio. | 6th Feb 1935 | Box 5a \ 4 04-page226 | |
| Dispatching a car for clutch tests in London traffic. | 13th Feb 1935 | Box 5a \ 4 04-page227 | |
| 18,000-mile engine wear report on vehicle 21-G-IV, detailing issues with bearings and valves. | 27th Feb 1935 | Box 5a \ 4 04-page228 | |
| Performance and condition of engine pistons, engine mountings, and the flywheel/clutch assembly. | 27th Feb 1935 | Box 5a \ 4 04-page229 | |
| The performance of the gearbox, servo motor mechanism, and propellor shaft. | 27th Feb 1935 | Box 5a \ 4 04-page230 | |
| Performance and faults of various engine and chassis components. | 27th Feb 1935 | Box 5a \ 4 04-page231 | |
| The performance of exhaust fittings, steering gear, and front axle controls. | 27th Feb 1935 | Box 5a \ 4 04-page232 | |
| The performance and condition of hydraulic dampers, governor control, rear axle, and rear brakes. | 27th Feb 1938 | Box 5a \ 4 04-page233 | |
| Technical report detailing issues with the front axle, brakes, radiator, bonnet, and wheel carriers. | 27th Feb 1935 | Box 5a \ 4 04-page234 | |
| The performance and issues with tyre jacks, ignition systems, spark plugs, and electrical petrol pumps. | 27th Feb 1935 | Box 5a \ 4 04-page235 | |
| The performance and failures of various electrical components, detailing a dynamo failure and issues with a diaphragm. | 27th Feb 1935 | Box 5a \ 4 04-page236 | |
| Issues with battery fittings, extensive bodywork faults, and windscreen wiper motor failure. | 27th Feb 1935 | Box 5a \ 4 04-page237 | |
| Record of the car's complete weight and the engine oil used. | 27th Feb 1935 | Box 5a \ 4 04-page238 | |
| Notification regarding a delay in completing drawings for the Isolated Change Speed Lever for the 15,000 miles trials car, 20/25 HP chassis. | 16th May 1935 | Box 5a \ 4 04-page239 | |
| The fitting of a new Borg and Beck clutch to vehicle or chassis 21-G-IV. | 20th Feb 1936 | Box 5a \ 4 04-page240 | |
| General tests on cars 21-G-IV and 22-G-V, including issues with chassis condition and a sticking accelerator pump. | 29th Jan 1936 | Box 5a \ 4 04-page241 | |
| Engine starting, carburation, and idling issues for car 21-0-IV. | 29th Jan 1936 | Box 5a \ 4 04-page242 | |
| Report page detailing observations on engine performance, vibration, and fuel/oil consumption for test cars. | 29th Jan 1936 | Box 5a \ 4 04-page243 | |
| The performance of the clutch, steering, and gearbox after extensive road testing in London. | 29th Jan 1936 | Box 5a \ 4 04-page244 | |
| The performance of the car's springing and braking systems during testing. | 29th Jan 1936 | Box 5a \ 4 04-page245 | |
| Power curve graph comparing the performance of the R.R. Steam Cooling System against a Standard Water Cooling system. | 10th Feb 1926 | Box 5a \ 5 05-page001 | |
| From 'R' requesting an estimate of expected power gains for a 20 HP engine following proposed modifications. | 1st Nov 1926 | Box 5a \ 5 05-page002 | |
| Requesting better M.E.P. (Mean Effective Pressure) and suitable valve springs for 20 HP and 40/50 engines. | 11th Nov 1926 | Box 5a \ 5 05-page003 | |
| Two acceleration graphs, one comparing a Rolls Royce Phantom to a Bentley, the other comparing high vs low axle ratios. | 11th Nov 1926 | Box 5a \ 5 05-page004 | |
| Two graphs comparing the acceleration performance of various open touring car models and engine configurations. | 1st Dec 1926 | Box 5a \ 5 05-page005 | |
| Performance improvements of a 20 HP car after modifications to its compression ratio, exhaust, and carburation. | 1st Dec 1926 | Box 5a \ 5 05-page006 | |
| Performance graphs showing acceleration and velocity for a 20 HP car under various configurations. | 30th Mar 1927 | Box 5a \ 5 05-page007 | |
| Performance test results of a Lorraine-Dietrich engine on a test bench. | 30th Mar 1927 | Box 5a \ 5 05-page008 | |
| The characteristics and performance of a six-cylinder engine, comparing it to the Coshawk, 20 HP, and Hispano models. | 30th Mar 1927 | Box 5a \ 5 05-page009 | |
| Zenith triple diffuser carburettors and their performance, including a diagram of the induction system. | 30th Mar 1927 | Box 5a \ 5 05-page010 | |
| Description of the 'offset' or 'desaxe' cylinder arrangement and the valve gear design. | 30th Mar 1927 | Box 5a \ 5 05-page011 | |
| Comparison of valve lift diagrams and gas velocity performance between the Lorraine and Goshawk engines. | 30th Mar 1927 | Box 5a \ 5 05-page012 | |
| Comparison of mechanical efficiency and ignition systems between Lorraine, Goshawk, Hispano, and Phantom engines. | 30th Mar 1927 | Box 5a \ 5 05-page013 | |
| Engine performance, detonation, and cylinder head design, including a sketch of an inlet valve. | 30th Mar 1927 | Box 5a \ 5 05-page014 | |
| Computed power curves for a 20 HP engine, comparing performance factors with a Lorraine engine and detailing valve and crankshaft observations. | 30th Mar 1927 | Box 5a \ 5 05-page015 | |
| Summary of engine performance, vibration characteristics, and a comparison with a 20 HP model. | 30th Mar 1927 | Box 5a \ 5 05-page016 | |
| Crankshaft 'master period' and experiments on a 20 HP engine. | 18th Aug 1922 | Box 5a \ 5 05-page017 | |
| Diagram comparing the exhaust valve lift of a Lorraine-Dietrich engine with a 20 HP engine. | 18th Aug 1922 | Box 5a \ 5 05-page018 | |
| Diagram comparing the inlet valve lift of a Lorraine-Dietrich engine against a 20 HP R.R. engine. | 18th Mar 1927 | Box 5a \ 5 05-page019 | |
| Graph of mechanical efficiency and compression pressure curves for a Lorraine-Dietrich engine, with a comparison to a 20 HP R.R. engine. | 21th Mar 1927 | Box 5a \ 5 05-page020 | |
| Graph comparing the power per unit cubic capacity and petrol consumption of a Lorraine-Dietrich engine against a 20 HP R.R. engine. | 16th Mar 1927 | Box 5a \ 5 05-page021 | |
| Power curve graph for a Lorraine-Dietrich engine, plotting Brake Horse Power and Brake Mean Effective Pressure against engine RPM. | 28th Mar 1927 | Box 5a \ 5 05-page022 | |
| Graph comparing depression in the induction pipe versus engine RPM for a Lorraine-Dietrich engine and a 20HP R.R. engine. | 21th Mar 1927 | Box 5a \ 5 05-page023 | |
| Graph plotting necessary ignition advance against engine RPM for Lorraine and Lister Phantom engines. | 17th Mar 1927 | Box 5a \ 5 05-page024 | |
| Performance curves for a Lorraine-Dietrich engine, showing gas velocity past valves. | 25th Mar 1927 | Box 5a \ 5 05-page025 | |
| Comparison graph of Indicated Horse Power and Indicated Mean Effective Pressure curves for a Lorraine-Dietrich and a 20 HP engine. | 25th Mar 1927 | Box 5a \ 5 05-page026 | |
| Graph showing the inlet valve lift and piston displacement curve for a Lorraine-Dietrich engine. | 22th Mar 1927 | Box 5a \ 5 05-page027 | |
| Graph showing the inlet valve lift and piston displacement curve for a 20 HP engine. | 28th May 1922 | Box 5a \ 5 05-page028 | |
| Graph of horse power vs RPM required to rotate a Lorraine-Dietrich engine. | 29th Mar 1911 | Box 5a \ 5 05-page029 | |
| Valve springs rating chart for the Lorraine-Dietrich engine. | 29th Mar 1927 | Box 5a \ 5 05-page030 | |
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