| Description | Date | Identifier | |
| Replying to suggestions for a 10,000-mile test, discussing engine mounting options and the proposal to send a car to France. | 28th May 1931 | Box 182 \ M19 img182 | |
| Solution to cure groans from the Phantom II rear brakes by coupling the hand and foot brakes. | 29th May 1931 | Box 182 \ M19 img183 | |
| Frame distortion tests, focusing on torsional stiffness, front end jellying, and the effect of engine mounting. | 29th May 1931 | Box 182 \ M19 img184 | |
| Test report comparing car frame deflection, damping, and engine mounting to investigate and reduce 'jellying' vibration. | 29th May 1931 | Box 182 \ M19 img185 | |
| Engine power outputs, camshafts, and carburettors for the P.II, 25 HP, and Phantom models. | 30th Sep 1931 | Box 182 \ M19 img186 | |
| Experiments comparing different Phantom II engine mounting configurations to reduce torque and vibration. | 2nd Jun 1931 | Box 182 \ M19 img187 | |
| Experiments for increasing horsepower on a P.2 engine. | 3rd Jun 1931 | Box 182 \ M19 img188 | |
| Power-increasing experiments involving modifications to carburetters and camshafts. | 3rd Jun 1931 | Box 182 \ M19 img189 | |
| Engine power output results from different carburetter configurations. | 3rd Jun 1931 | Box 182 \ M19 img190 | |
| Higher geared axle ratio tests carried out at Brooklands on two sales trials cars. | 4th Jun 1931 | Box 182 \ M19 img191 | |
| Car performance tests, comparing timed laps, axle ratios, and aerodynamic features. | 4th Jun 1931 | Box 182 \ M19 img192 | |
| Conclusion that the 12 X 41 axle would not improve the standard production Continental type car. | 4th Jun 1931 | Box 182 \ M19 img193 | |
| Horsepower required for a Phantom II to achieve 100 M.P.H. and comparing engine performance with a Bentley. | 8th Jun 1931 | Box 182 \ M19 img194 | |
| Feasibility and design considerations for a 6:1 compression ratio on the Phantom II engine. | 1st Jun 1931 | Box 182 \ M19 img195 | |
| Camshaft experiments for the Phantom II engine, detailing results of varying tappet clearance and duration. | 12th Jun 1931 | Box 182 \ M19 img196 | |
| Technical memorandum discussing the effects of exhaust cams, valves, and carburetters on engine performance. | 12th Jun 1931 | Box 182 \ M19 img197 | |
| Camshaft adjustments to achieve 200 B.HP, with a comparison to an 8-litre Bentley engine. | 13th Apr 1931 | Box 182 \ M19 img198 | |
| Power loss in the Phantom II engine's exhaust system and the effect of the silencer at high speeds. | 13th Apr 1931 | Box 182 \ M19 img199 | |
| Graph showing power tests (BHP vs RPM) on a PII unit, comparing an open exhaust to a standard silencer system. | 4th Jun 1931 | Box 182 \ M19 img200 | |
| Test results for 40/50 camshafts, focusing on timing adjustments and large diameter inlet valves. | 17th Jun 1931 | Box 182 \ M19 img201 | |
| Technical discussion on exhaust valve timing, camshaft design, and valve lift, including a comparison with American cars. | 17th Jun 1931 | Box 182 \ M19 img202 | |
| Graph comparing engine performance (BHP and BMEP vs RPM) for different valve timing configurations found by experiment. | 17th Jun 1931 | Box 182 \ M19 img203 | |
| Performance graph comparing large versus small valves, detailing BHP and BMEP against RPM for an engine with a 4.9 compression ratio. | 17th Jun 1931 | Box 182 \ M19 img204 | |
| Blueprint showing desirable and alternative camshaft timings for the 40/50 model. | 18th Jun 1931 | Box 182 \ M19 img205 | |
| Tests conducted to ascertain and eliminate bonnet movement and knocks on un-made roads. | 18th Jun 1931 | Box 182 \ M19 img206 | |
| The high-speed performance testing of a Phantom II car at Brooklands, which resulted in a broken crankshaft. | 13th Jul 1931 | Box 182 \ M19 img207 | |
| Diagrams measuring bonnet movement in thousandths of an inch for different engine and radiator mounting configurations under chassis torsion. | 19th Jun 1924 | Box 182 \ M19 img208 | |
| Engine and component troubles including crankshaft breakage, vibrations, and poor running. | 10th Jul 1931 | Box 182 \ M19 img209 | |
| Performance test graph for car 27EX at Brooklands, showing top gear acceleration against time. | 10th Jul 1931 | Box 182 \ M19 img210 | |
| Confirming no alterations have been made to the Phantom II cylinder head combustion chamber. | 18th Jul 1931 | Box 182 \ M19 img211 | |
| 10,000-mile test of shock absorbers, detailing faults with the replenishing ball valve. | 24th Jul 1931 | Box 182 \ M19 img212 | |
| High power camshaft Phantom II tests, comparing performance and valve timing diagrams with the 'China' 25 HP engine. | 8th Aug 1931 | Box 182 \ M19 img213 | |
| Engine tests comparing valve lift and camshaft designs for power efficiency. | 6th Aug 1931 | Box 182 \ M19 img214 | |
| Tabulated list of valve opening specifications for various engine types. | 5th Aug 1931 | Box 182 \ M19 img215 | |
| West Wittering 120° camshaft for the P.2 engine and comparisons with other camshafts. | 5th Aug 1931 | Box 182 \ M19 img216 | |
| Knocking sound from the front of a car, traced to the reaction dampers and requesting an increase to the friction area. | 1st Aug 1931 | Box 182 \ M19 img217 | |
| The development of an air intake silencer for the Phantom II twin choke carburettor. | 2nd Aug 1931 | Box 182 \ M19 img218 | |
| Tests carried out to understand and reduce persistent steering joggling on Phantom II cars. | 31th Aug 1931 | Box 182 \ M19 img219 | |
| Page 2 of a report detailing comparative road tests on steering, suspension, and vehicle stability. | 31th Aug 1931 | Box 182 \ M19 img220 | |
| Vehicle suspension and steering component testing, including damping, shackles, and tyres. | 31th Aug 1931 | Box 182 \ M19 img221 | |
| Spring eye movement during braking and road tests, with plans for fitting a new flexible shackle. | 31th Aug 1931 | Box 182 \ M19 img222 | |
| Tests conducted to investigate the cause of persistent joggling in Phantom II car steering. | 31th Aug 1931 | Box 182 \ M19 img223 | |
| Blueprint for a device called a Steering 'Snatchmeter'. | 31th Aug 1931 | Box 182 \ M19 img224 | |
| Graphical analysis of the maximum movement of a flexible shackle spring eye under different road and driving conditions. | 31th Aug 1931 | Box 182 \ M19 img225 | |
| Investigation into crankcase cracks on two test bed engines and proposing solutions. | 31th Aug 1931 | Box 182 \ M19 img226 | |
| Experimental work on improving car cooling systems, focusing on radiator tube designs. | 2nd Sep 1931 | Box 182 \ M19 img227 | |
| Engine boiling issues in various car models and potential improvements using different tube types. | 2nd Sep 1931 | Box 182 \ M19 img228 | |
| Tests for Phantom II twin carburettors, detailing flooding issues caused by fitting new round type floats and proposing solutions. | 17th Sep 1931 | Box 182 \ M19 img229 | |
| Adjustments and modifications to carburetters for improved slow running performance. | 7th Sep 1931 | Box 182 \ M19 img230 | |
| Technical memo detailing adjustments and performance of variable valves and diffusers for carburettors. | 7th Sep 1931 | Box 182 \ M19 img231 | |
| Schematic diagram for a slow running system on a twin-choke carburettor. | 26th Feb 1921 | Box 182 \ M19 img232 | |
| Analysis of tests on the Phantom II engine to obtain the best power output with the W.W. 114° shaft. | 8th Sep 1931 | Box 182 \ M19 img233 | |
| Effects of valve size, camshaft timing, and carburettor settings on engine power output. | 1st Aug 1931 | Box 182 \ M19 img234 | |
| Performance graph comparing various carburettor and induction system configurations. | 20th Jan 1931 | Box 182 \ M19 img235 | |
| Performance graph comparing large and small valves, plotting Brake Horsepower (BHP) and Brake Mean Effective Pressure (BMEP) against engine RPM. | 20th Aug 1931 | Box 182 \ M19 img236 | |
| Graph comparing engine performance (B.HP and B.M.E.P. vs R.P.M.) for different high lift rockers, valve lifts, and carburetors. | 5th Aug 1931 | Box 182 \ M19 img237 | |
| Graph comparing engine performance based on different valve lift specifications and timing. | 5th Aug 1931 | Box 182 \ M19 img238 | |
| Graph showing the effect of increased valve lift on engine performance at various RPMs. | 5th Aug 1931 | Box 182 \ M19 img239 | |
| Graph comparing engine performance curves (BHP and BMEP vs RPM) for three different inlet valve timing configurations. | 5th Aug 1931 | Box 182 \ M19 img240 | |
| Graph comparing engine performance based on different valve sizes and camshaft timings. | 5th Aug 1931 | Box 182 \ M19 img241 | |
| Performance graph showing the effect of increased valve lift on a standard camshaft and cylinder head. | 5th Aug 1931 | Box 182 \ M19 img242 | |
| Blueprint of an inlet valve with a 30° seat and small diameter. | 19th Sep 1931 | Box 182 \ M19 img243 | |
| The results of P.2 cooling tests concerning under-bonnet air pressure. | 19th Sep 1931 | Box 182 \ M19 img244 | |
| Blueprints for 5/1 and 5¼/1 compression ratio heads and their performance. | 22th Sep 1931 | Box 182 \ M19 img245 | |
| Cooling tests comparing different radiator matrix tubes and the effect of ventilation. | 30th Sep 1931 | Box 182 \ M19 img246 | |
| High temperatures recorded under the floorboards near the pedals, emphasizing the need for improved ventilation. | 30th Sep 1931 | Box 182 \ M19 img247 | |
| Test results on the Phantom II engine's power output in relation to choke size, depression, and camshaft performance. | 2nd Oct 1931 | Box 182 \ M19 img248 | |
| Carburettor performance, comparing expanding versus fixed jet types and their effect on power output and engine flexibility. | 2nd Oct 1931 | Box 182 \ M19 img249 | |
| Power output curves and track testing for the unit fitted to the 27-EX 'Model' Continental car. | 5th Oct 1931 | Box 182 \ M19 img250 | |
| Curve showing power loss in the P.2 exhaust system and concerns for customers with the Continental type. | 9th Oct 1931 | Box 182 \ M19 img251 | |
| Fitting of experimental modified exhaust manifolds on a Phantom 1 engine and a car owned by Mr. Dubonnet. | 6th Oct 1931 | Box 182 \ M19 img252 | |
| Issues with a 25-EX model fitted with an A.C. Petrol Pump, including flooding, misfiring and boiling. | 3rd Oct 1931 | Box 182 \ M19 img253 | |
| Experiments and modifications on a Phantom II petrol pump compared to an A.C. pump. | 3rd Oct 1931 | Box 182 \ M19 img254 | |
| Performance tests of a car with modified engine parts at Brooklands track. | 5th Oct 1931 | Box 182 \ M19 img255 | |
| Proposal to adopt modifications for flip-flap shutters as standard on the 22-EX model's rivetless bonnet. | 19th Oct 1931 | Box 182 \ M19 img256 | |
| The dimensions and clearances of bonnet shutters, including adjustments for paintwork. | 21th Oct 1931 | Box 182 \ M19 img257 | |
| The Talbot 90 car, detailing its specifications and performance characteristics from the Olympia Motor Show. | 26th Oct 1931 | Box 182 \ M19 img258 | |
| Performance and specification review of several car models, including the Talbot 75 and 18/80 M.G. Mark II. | 26th Oct 1931 | Box 182 \ M19 img259 | |
| Road performance report on a 2.5-litre car and specifications for a Hispano Suiza 12-cylinder engine. | 26th Oct 1931 | Box 182 \ M19 img260 | |
| Vehicle performance report detailing chassis modifications, silence, vibration, and acceleration. | 26th Oct 1931 | Box 182 \ M19 img261 | |
| Review of competitor vehicles, Hispano and Chrysler, detailing brakes, suspension, and engine mounting. | 26th Oct 1931 | Box 182 \ M19 img262 | |
| Specifications for an inlet manifold, compression ratio, balance weights, and other vehicle components. | 26th Oct 1931 | Box 182 \ M19 img263 | |
| Observations on competitor designs for radiator mounting, induction pipes, carburetters, and engine mounting. | 26th Oct 1931 | Box 182 \ M19 img264 | |
| Brief non-technical precis of competitor cars tried. | 26th Oct 1931 | Box 182 \ M19 img265 | |
| Summary of impressions from a motor show, comparing British and American cars and outlining competitive strategy. | 26th Oct 1931 | Box 182 \ M19 img266 | |
| Comparison of power output between a Claudel carburetor and a single jet expanding S.U. carburetor. | 28th Oct 1931 | Box 182 \ M19 img267 | |
| The effects of adjusting valve timing and clearance on engine performance. | 28th Oct 1931 | Box 182 \ M19 img268 | |
| Performance comparison graphs for different S.U. and Claudel carburetor and induction pipe configurations. | 29th Oct 1931 | Box 182 \ M19 img269 | |
| The results of a rough test on masked inlet valves. | 29th Oct 1931 | Box 182 \ M19 img270 | |
| Graph comparing the performance of a 108° masked camshaft against a 114° unmasked camshaft with high lift rockers. | 29th Oct 1931 | Box 182 \ M19 img271 | |
| Performance comparison graph for 112° masked and 114° unmasked camshafts. | 29th Oct 1931 | Box 182 \ M19 img272 | |
| Graph plotting engine performance curves showing losses to the exhaust system for a PH. II short type engine. | 1st Nov 1931 | Box 182 \ M19 img273 | |
| Mechanical failures identified during high-speed running of the Phantom II engine. | 1st Nov 1931 | Box 182 \ M19 img274 | |
| Blueprint illustrating a crack in a cylinder head near the valve assembly. | 2nd Nov 1936 | Box 182 \ M19 img275 | |
| Test report on a Phantom II synchro-mesh gearbox with a heavier driven clutch member. | 12th Nov 1931 | Box 182 \ M19 img276 | |
| Blueprint detailing the design features of a mechanical component. | 12th Nov 1931 | Box 182 \ M19 img277 | |
| Blueprint showing a cross-sectional view of a mechanical shock absorber or damper assembly. | 12th Nov 1931 | Box 182 \ M19 img278 | |
| Schematic drawing of a mechanical component, possibly a pump, with internal mechanisms. | 12th Nov 1931 | Box 182 \ M19 img279 | |
| Graph showing the output speed performance of various dynamos at a constant operating voltage. | 4th Feb 1931 | Box 182 \ M19 img280 | |
| Blueprint showing output speed performance curves for various dynamos at 80°C. | 4th Feb 1931 | Box 182 \ M19 img281 | |
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