| Description | Date | Identifier | |
| Troubleshooting a valve noise issue through various modifications and tests involving hole sizes, springs, and oil flow. | 1st Jun 1931 | Box 182 \ M19 img082 | |
| Tests on various valve and spring configurations to reduce noise and rationalize pressure diagrams. | 1st Jun 1931 | Box 182 \ M19 img083 | |
| Test report on the performance of various spring and valve configurations for a damper assembly. | 2nd Jun 1931 | Box 182 \ M19 img084 | |
| Standardisation of extended exhaust tailpipes for P.2 & 25 HP models. | 2nd Jun 1931 | Box 182 \ M19 img085 | |
| Road test report on a Humber Snipe Fabric Saloon comparing its performance against a 20/25 HP model. | 2nd Jun 1931 | Box 182 \ M19 img086 | |
| Performance and handling report on a Humber car, comparing its components and road manners to a Rolls-Royce 20/25 HP model. | 2nd Jun 1931 | Box 182 \ M19 img087 | |
| Engine mounting improvements to reduce 'booming' on the 40/50 model and requesting a production-ready design. | 4th Dec 1930 | Box 182 \ M19 img088 | |
| Tests on chassis 24-EX with a balanced crankshaft and new engine mountings to resolve engine booming issues. | 16th Dec 1930 | Box 182 \ M19 img089 | |
| Brake shoe design and comparing brake lining areas with competitor vehicles. | 16th Dec 1930 | Box 182 \ M19 img090 | |
| Table detailing the dimensions of servo-operated front and rear brakes for various car models. | 4th Dec 1931 | Box 182 \ M19 img091 | |
| Table of specifications for servo-operated front and rear brakes on various car models. | 4th Dec 1931 | Box 182 \ M19 img092 | |
| Investigation into a vehicle body 'booming' noise issue and the division of responsibility. | 23th Dec 1930 | Box 182 \ M19 img093 | |
| Preliminary test results for a new twin choke carburetter on a Phantom II. | 24th Dec 1930 | Box 182 \ M19 img094 | |
| Engine vibrations ('boom') in the 40/50 engine and the effects of modifying connecting rod length. | 9th Jan 1931 | Box 182 \ M19 img095 | |
| Standardisation document for adjustable pedal stems, P.11. | 18th Oct 1930 | Box 182 \ M19 img096 | |
| Introduction of a new part, including chassis fitting information and associated costs. | 23th Dec 1920 | Box 182 \ M19 img097 | |
| Forwarding a note from MX and asking for instructions on how to test an item with more bearing area. | 14th Jan 1931 | Box 182 \ M19 img098 | |
| Phantom II piston complaints and proposing an increase in piston length. | 5th Jan 1931 | Box 182 \ M19 img099 | |
| Difficulties with the Phantom II magneto and battery ignition system, recommending a switch to twin battery ignition. | 14th Jan 1931 | Box 182 \ M19 img100 | |
| Technical argument against magneto ignition on the Phantom II, focusing on starting difficulties. | 14th Jan 1931 | Box 182 \ M19 img101 | |
| Notice about the risks of damage to the dynamo if the battery is run down or disconnected. | 14th Jan 1931 | Box 182 \ M19 img102 | |
| Standardisation report for altering the Phantom II exhaust system to the 20/25 scheme. | 11th Dec 1930 | Box 182 \ M19 img103 | |
| Standardisation form for a Phantom II chassis part, including costs and approval routing. | 28th Nov 1938 | Box 182 \ M19 img104 | |
| Failure of a P.II. Low Inertia Slipper Wheel during critical speed testing on a crankshaft. | 21th Jan 1931 | Box 182 \ M19 img105 | |
| Blueprint showing two views of a P.II. Low Inertia Crankshaft Damper. | 26th Aug 1930 | Box 182 \ M19 img106 | |
| Standardisation of an oil drain plug in the side of the engine case. | 26th Aug 1930 | Box 182 \ M19 img107 | |
| Standardisation of parts form detailing the introduction of a new part to a chassis series, associated costs, and approvals. | 20th Feb 1920 | Box 182 \ M19 img108 | |
| Ongoing tests and modifications for the Phantom II twin-choke carburettors. | 28th Jan 1931 | Box 182 \ M19 img109 | |
| Progress report on applying an aero carburettor scheme to a 'Downdraught' carburettor and subsequent testing. | 27th Jan 1931 | Box 182 \ M19 img110 | |
| Performance graph comparing twin carburetors with a standard P1 carburetor and induction system. | 30th Jan 1931 | Box 182 \ M19 img111 | |
| Tests carried out on the springing of the Phantom II model. | 7th Feb 1931 | Box 182 \ M19 img112 | |
| Spring modifications and ride comfort tests on various experimental cars. | 7th Feb 1931 | Box 182 \ M19 img113 | |
| Suspension tests concerning frame distortion, weight distribution, and shock absorbers on 20-EX and 20/25 HP models. | 9th Feb 1931 | Box 182 \ M19 img114 | |
| Customer complaints about vibrations and booms in Phantom II and 25 HP models. | 9th Feb 1931 | Box 182 \ M19 img115 | |
| Tests and findings on engine and chassis vibrations, including torque reaction and booming noises. | 1st Feb 1931 | Box 182 \ M19 img116 | |
| Diagnosing and curing engine vibrations in various car models, including the 25 HP. | 9th Feb 1931 | Box 182 \ M19 img117 | |
| Arrangements for wind tunnel testing of radiators with Messrs. Boulton & Paull to address boiling issues. | 14th Feb 1931 | Box 182 \ M19 img118 | |
| Investigations into 'booms and vibrations' on the Phantom II, including engine mounting tests and body swapping. | 23th Feb 1931 | Box 182 \ M19 img119 | |
| Chassis issues, frame jellying, engine mounting solutions, and known faults in cars destined for America. | 23th Feb 1931 | Box 182 \ M19 img120 | |
| Test results and issues for left-hand drive cars and the despatch of Phantom II models. | 23th Feb 1931 | Box 182 \ M19 img121 | |
| Downdraught carburetter tests on the Phantom II. | 26th Feb 1931 | Box 182 \ M19 img122 | |
| Power curve comparisons between downdraught and standard carburetters, focusing on distribution and induction systems. | 26th Feb 1931 | Box 182 \ M19 img123 | |
| Test report on the performance of Maybach dogs on the 14-EX chassis, detailing issues with gear engagement. | 26th Feb 1931 | Box 182 \ M19 img124 | |
| Analysis of transmission jerks and crashes during various gear change scenarios. | 26th Feb 1931 | Box 182 \ M19 img125 | |
| Gearbox engagement issues, specifically 'clicking' and 'klonking', and proposed modifications. | 26th Feb 1931 | Box 182 \ M19 img126 | |
| Required alterations to the 40/50 and 25 HP easy change silent gearboxes, based on information from Dr. Maybach. | 2nd Mar 1931 | Box 182 \ M19 img127 | |
| Cross-section diagram and gear ratio table for a Maybach transmission for large vehicles. | 2nd Mar 1931 | Box 182 \ M19 img128 | |
| Discussion with Dr. Maybach in Berlin regarding the design and operation of the Maybach dog clutch system. | 2nd Mar 1931 | Box 182 \ M19 img129 | |
| Technical discussion and diagrams of Maybach gearbox changes and operation. | 2nd Mar 1931 | Box 182 \ M19 img130 | |
| Preparation and modification of car 27-EX for a visit to Le Canadel. | 3rd Mar 1931 | Box 182 \ M19 img131 | |
| Development of a 12-cylinder car, competitor analysis, and the decision to build their own engine. | 4th Mar 1931 | Box 182 \ M19 img132 | |
| Internal memorandum detailing tests to diagnose the cause of a 'boom' or vibration in the Phantom II model. | 1st Nov 1931 | Box 182 \ M19 img133 | |
| Diagnosing 'boom' and resonance issues by comparing different vehicle configurations and components. | 11th Mar 1931 | Box 182 \ M19 img134 | |
| Investigating 'boom' and vibration issues on a Phantom II car, 27-EX. | 31th Mar 1931 | Box 182 \ M19 img135 | |
| Preliminary test report on an epicyclic easy change gearbox with a vacuum controlled twin top change gear. | 31th Mar 1931 | Box 182 \ M19 img136 | |
| Drawbacks of a gearbox, including a 'clonk' noise, a complicated gear change mechanism, and notes on grinding gears. | 31th Mar 1931 | Box 182 \ M19 img137 | |
| Gearbox noise and issues with gear changes, specifically concerning the epicyclic third and Maybach dogs. | 31th Mar 1931 | Box 182 \ M19 img138 | |
| Experimental tests investigating 'jelly'ing' and body booms, comparing different engine mounting, spring, and tyre configurations. | 2nd Apr 1931 | Box 182 \ M19 img139 | |
| Analysis of vehicle booming, radiator movement, and torque reaction issues, summarising findings and proposing solutions. | 2nd Apr 1931 | Box 182 \ M19 img140 | |
| Investigations into engine mounting feet and frame stiffness to reduce 'jellying' or vibration. | 2nd Apr 1931 | Box 182 \ M19 img141 | |
| Distressing noise in a gearbox with an epicyclic third speed, caused by the angle of the Maybach jaws. | 2nd Apr 1931 | Box 182 \ M19 img142 | |
| Road tests of a twin-choke carburetter on a Phantom II car. | 2nd Apr 1931 | Box 182 \ M19 img143 | |
| Carburettor road tests, detailing metering issues, fuel starvation problems, and performance improvements. | 2nd Apr 1931 | Box 182 \ M19 img144 | |
| Carburettor performance, noise levels, fuel distribution, and consumption. | 2nd Apr 1931 | Box 182 \ M19 img145 | |
| Investigation into flooding and fuel starvation issues with the Phantom II Twin Choke Carburetters during cornering. | 17th Apr 1931 | Box 182 \ M19 img146 | |
| Carburetter fuel level behaviour under tilt in R. engines and Phantom IIs, proposing tests and solutions. | 17th Apr 1931 | Box 182 \ M19 img147 | |
| Diagram illustrating a fault with the float chamber buoyancy in a Phantom II Twin Choke Carburetter at an incline. | 17th Apr 1931 | Box 182 \ M19 img148 | |
| Comparative performance test report between Rolls-Royce PII Continental models and Bentley 6.5 & 8 Litre cars. | 17th Apr 1931 | Box 182 \ M19 img149 | |
| Performance comparison report between various Bentley and experimental car models. | 18th Mar 1931 | Box 182 \ M19 img150 | |
| Investigations into a 'booming' noise complaint on Phantom II cars. | 18th Mar 1931 | Box 182 \ M19 img151 | |
| Investigation into the cause of an engine 'boom' in Phantom II cars at 2200 r.p.m. | 18th Apr 1931 | Box 182 \ M19 img152 | |
| Investigation into the cause and potential cures for a resonance 'boom' vibration in Phantom II cars. | 18th Apr 1931 | Box 182 \ M19 img153 | |
| Customer complaints about 'booms' by modifying the rear engine support. | 18th Apr 1931 | Box 182 \ M19 img154 | |
| Tests of Phantom II rear springing and rear axle movement under various road conditions with different dampers. | 20th Apr 1931 | Box 182 \ M19 img155 | |
| Graph showing the effect of adjustable leak on rear axle movement on a 25 EX car. | 20th Apr 1931 | Box 182 \ M19 img156 | |
| Graph showing the effect of drilled valves on maximum rear axle movement during a level crossing test. | 20th Apr 1931 | Box 182 \ M19 img157 | |
| Graph showing the effect of drilled valves on rear axle movement over a hump-backed bridge. | 21th Apr 1931 | Box 182 \ M19 img158 | |
| Phantom II radiator tests comparing square, standard, and two types of American tubes. | 21th Apr 1931 | Box 182 \ M19 img159 | |
| Page 2 of a report discussing the efficiency of a more costly tube shape, with further tests pending. | 21th Apr 1931 | Box 182 \ M19 img160 | |
| Comparative table of radiator tube types and their critical air temperature performance under different ventilation conditions. | 27th Mar 1930 | Box 182 \ M19 img161 | |
| Manufacturing and testing instructions for a 'Matrix Tube', detailing annealing and pressure testing procedures. | 27th Mar 1930 | Box 182 \ M19 img162 | |
| Brake inefficiency tests on Phantom cars, comparing different brake drum and shoe configurations. | 5th May 1931 | Box 182 \ M19 img163 | |
| Brake drum tests and a proposed solution for a customer's brake efficiency complaint. | 5th May 1931 | Box 182 \ M19 img164 | |
| Testing and modifying the slow-running scheme for twin-choke carburettors. | 5th May 1931 | Box 182 \ M19 img165 | |
| Carburetter performance, comparing various mixture metering schemes and suggesting improvements for adjustment. | 15th May 1931 | Box 182 \ M19 img166 | |
| Examination of the slow running, starting, and accelerator pump schemes of a Zenith double choke carburetter. | 5th May 1931 | Box 182 \ M19 img167 | |
| Function of a piston, accelerator pump, slow running unit, and Zenith float. | 15th May 1931 | Box 182 \ M19 img168 | |
| Diagram showing a cross-section of a Phantom II Twin Choke Carburettor. | 15th May 1931 | Box 182 \ M19 img169 | |
| Blueprint detailing a modification for slow running on Phantom II twin choke carburettors. | 15th May 1931 | Box 182 \ M19 img170 | |
| Schematic diagram of a Zenith slow running carburettor system. | 14th May 1936 | Box 182 \ M19 img171 | |
| Development and testing of balance weights for 25 HP and Phantom II crankshafts. | 16th May 1931 | Box 182 \ M19 img172 | |
| Crankshaft balance weights and critical speeds for the 25 HP and Phantom 11 engines. | 16th May 1931 | Box 182 \ M19 img173 | |
| Table comparing car boiling temperatures at various speeds with different bonnet ventilation configurations. | 16th May 1931 | Box 182 \ M19 img174 | |
| Test report comparing the boiling temperatures of different radiator matrix types at various speeds. | 20th May 1931 | Box 182 \ M19 img175 | |
| Proposal for a 10,000-mile test of a Phantom II in France to evaluate engine mounting solutions for reducing 'booms'. | 20th May 1931 | Box 182 \ M19 img176 | |
| Planned modifications to a car's engine, fuel system, radiator, brakes, and suspension. | 20th May 1931 | Box 182 \ M19 img177 | |
| List of proposed updates and tests for various vehicle components including springs, dynamo, starter motor, and exhaust. | 1st May 1931 | Box 182 \ M19 img178 | |
| Potential improvements to the appearance of the lower controls on the 27-EX car. | 20th May 1931 | Box 182 \ M19 img179 | |
| Present and alternative rear axle ratios for the Phantom II and 25 HP models. | 20th May 1931 | Box 182 \ M19 img180 | |
| Power output tests and potential improvements for the Continental Phantom II engine. | 23th May 1931 | Box 182 \ M19 img181 | |
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