| Description | Date | Identifier | |
| Water pump fabric drive and engine water leaks from cylinders. | 8th Apr 1931 | Morton \ M19 img058 | |
| Trial run of a Buick car fitted with a synchro mesh gear device. | 21th Apr 1931 | Morton \ M19 img059 | |
| Comparing a 6-cylinder Buick's crankcase ventilation system to their own, highlighting its effectiveness in preventing oil smells. | 22th Apr 1931 | Morton \ M19 img060 | |
| Investigations into various easy change gear systems, including Voisin, Graham Paige, and Buick synchromesh. | 2nd May 1931 | Morton \ M19 img061 | |
| Comparing the Kismet '31 Tyre Tester to the Schrader gauge and recommending it for standardisation. | 4th May 1931 | Morton \ M19 img062 | |
| Referencing a sketch and description of Voisin gear found in a 1930 Paris Show report. | 5th May 1931 | Morton \ M19 img063 | |
| Petrol pump with a fabric diaphragm, comparing it to a similar A.C. pump. | 5th May 1931 | Morton \ M19 img064 | |
| The function of carburettor float chambers during fast cornering and tilt. | 7th May 1931 | Morton \ M19 img065 | |
| Carburetter design, including diffuser flooding, accelerating pumps, and future development for supercharged aero engines. | 7th May 1931 | Morton \ M19 img066 | |
| Reviewing the position of road springs and the effects of fitting low-rating springs on riding quality, steering, and braking. | 13th May 1931 | Morton \ M19 img067 | |
| The maximum stress in spring leaves and a summary of spring standardisation for the 25 HP and 40/50 models. | 13th May 1931 | Morton \ M19 img068 | |
| Investigation and proposed solution for Phantom rear brake groans. | 19th May 1931 | Morton \ M19 img069 | |
| Radiator tests conducted at Brooklands, comparing hexagonal and square tube designs for efficiency and resistance. | 19th May 1931 | Morton \ M19 img070 | |
| Comparison of radiator and bonnet efficiencies, including weight, ventilation, and cost considerations. | 19th May 1931 | Morton \ M19 img071 | |
| Radiator efficiency improvements and the requirement for a wind tunnel for further testing. | 19th May 1931 | Morton \ M19 img072 | |
| Report on Delco Shock Absorbers, shimmy shackles, and synchro mesh gearboxes. | 21th May 1931 | Morton \ M19 img073 | |
| Tests on various valve lifts and camshafts for 25 HP and 40/50 engines. | 22th May 1931 | Morton \ M19 img074 | |
| The effect of balance weights on flywheel wobble in Phantom II and 25 HP models. | 23th May 1931 | Morton \ M19 img075 | |
| Flywheel balance weight testing and its effect on flywheel wobble. | 23th May 1931 | Morton \ M19 img076 | |
| Customer complaints about overheating and recommending changes to radiator tube design. | 28th May 1931 | Morton \ M19 img077 | |
| Query on American engine design, gearboxes, and manufacturing methods. | 29th May 1931 | Morton \ M19 img078 | |
| Development and testing of a double valve for hydraulic shock absorbers. | 1st Jun 1931 | Morton \ M19 img079 | |
| Schematic diagram of a Double Piston Damper with various valve configurations and component details. | 1st Jun 1931 | Morton \ M19 img080 | |
| Investigation into the cause and rectification of noise from a double piston damper. | 1st Jun 1931 | Morton \ M19 img081 | |
| Test report on diagnosing and rectifying a noise issue in a valve through various modifications. | 1st Jun 1931 | Morton \ M19 img082 | |
| Test report on high pressure valve performance, noise, and modifications including different springs, designs, and valve lifts. | 19th May 1931 | Morton \ M19 img083 | |
| Tests conducted on valve and damper springs, including modifications to reduce noise and improve performance. | 19th May 1931 | Morton \ M19 img084 | |
| Standardisation of P.2 & 25 HP exhaust tail pipes. | 2nd Jun 1931 | Morton \ M19 img085 | |
| Road test performance comparison of a Humber Snipe Fabric saloon against an average 20/25 HP model, covering hill climbs and acceleration. | 2nd Jun 1931 | Morton \ M19 img086 | |
| Performance and handling evaluation report of a vehicle, covering speed, engine, suspension, braking, and gearbox. | 2nd Jun 1931 | Morton \ M19 img087 | |
| Engine mounting modifications to reduce 'booming' on the 40/50 model. | 4th Dec 1930 | Morton \ M19 img088 | |
| Engine boom issues in 40/50 & 25 HP models, detailing tests on balanced crankshafts and flywheels. | 15th Dec 1930 | Morton \ M19 img089 | |
| Review of brake shoe design and lining areas for 40/50 and 25 HP models, with a comparison to competitor vehicles. | 16th Dec 1930 | Morton \ M19 img090 | |
| Table of dimensions for servo-operated brakes across various models. | 4th Dec 1930 | Morton \ M19 img091 | |
| Table of particulars for servo-operated brakes across various car models. | 4th Dec 1930 | Morton \ M19 img092 | |
| Problem of 'booming' in car bodies and the collaborative efforts to resolve it. | 23th Dec 1930 | Morton \ M19 img093 | |
| Preliminary test report on a new twin choke carburettor for the Phantom II model, detailing performance and issues. | 24th Dec 1930 | Morton \ M19 img094 | |
| Engine vibrations, flywheel boom, and connecting rod length tests on 40/50 engines. | 9th Jan 1931 | Morton \ M19 img095 | |
| Standardisation of Chassis Parts document for Adjustable Pedal Stems, P.11. | 18th Oct 1930 | Morton \ M19 img096 | |
| Standardisation of parts form detailing costs for new jigs and tools, and tracking approvals. | 27th Oct 1930 | Morton \ M19 img097 | |
| Forwarding a note from Mx, asking how to proceed with testing an increased bearing area. | 14th Jan 1931 | Morton \ M19 img098 | |
| Complaints about the Phantom II piston and proposing an increase in its length for improved performance. | 5th Jan 1931 | Morton \ M19 img099 | |
| The difficulties of starting the Phantom II on magneto ignition, recommending a switch to a twin battery system. | 14th Jan 1931 | Morton \ M19 img100 | |
| Comparison of magneto and battery ignition systems, detailing the difficulties of starting a Phantom II with a magneto. | 14th Jan 1931 | Morton \ M19 img101 | |
| Warning about potential dynamo damage when the car battery is run down or disconnected. | 14th Jan 1931 | Morton \ M19 img102 | |
| Standardisation of chassis parts concerning the alteration of the Phantom II exhaust system to the 20/25 scheme. | 11th Dec 1930 | Morton \ M19 img103 | |
| Form for the standardization of chassis parts. | 11th Dec 1930 | Morton \ M19 img104 | |
| The failure of a Phantom II low inertia slipper wheel during testing. | 21th Jan 1931 | Morton \ M19 img105 | |
| Blueprint of a P.II. Low Inertia Crankshaft Damper. | 26th Aug 1930 | Morton \ M19 img106 | |
| Standardisation of an oil drain plug in the side of the engine case. | 26th Aug 1930 | Morton \ M19 img107 | |
| Standardisation form detailing the cost and schedule for fitting a new part to a chassis. | 20th Jan 1930 | Morton \ M19 img108 | |
| Continued tests and modifications to the Phantom II twin choke carburettors. | 28th Jan 1931 | Morton \ M19 img109 | |
| The successful initial testing and adjustment of a new aero carburetter scheme. | 27th Jan 1931 | Morton \ M19 img110 | |
| Performance graph comparing twin carburettor systems with a standard P1 carburettor and induction system. | 1st Jul 1931 | Morton \ M19 img111 | |
| Tests of lower rating front and rear road springs for the Phantom II car. | 7th Feb 1931 | Morton \ M19 img112 | |
| Vehicle suspension testing, detailing modifications to springs and the use of weights to improve ride comfort and reduce frame jellying. | 7th Feb 1931 | Morton \ M19 img113 | |
| Suspension tests addressing body distortion, frame distortion, and the effects of shock absorbers and springs. | 9th Feb 1931 | Morton \ M19 img114 | |
| Customer complaints about vibrations and booms in Phantom II and 25 HP models. | 9th Feb 1931 | Morton \ M19 img115 | |
| Tests on engine mountings, clutch components, and torque reaction dampers to mitigate car booming and vibrations. | 9th Feb 1931 | Morton \ M19 img116 | |
| Engine vibration issues, flywheel wobble, and potential cures on 25 HP and other models. | 9th Feb 1931 | Morton \ M19 img117 | |
| Arranging wind tunnel tests on radiators with Boulton & Paull to address a complaint of boiling. | 14th Feb 1931 | Morton \ M19 img118 | |
| Testing and troubleshooting of 'booms and vibrations' on Phantom II cars, including modifications to engine mountings. | 23th Feb 1931 | Morton \ M19 img119 | |
| Troubleshooting frame jellying and vibration issues using different engine mounting schemes. | 23th Feb 1931 | Morton \ M19 img120 | |
| The performance and modifications of left-hand drive cars, including engine compression ratios and delivery schedules. | 23th Feb 1931 | Morton \ M19 img121 | |
| Downdraught carburettor tests for the Phantom II. | 26th Feb 1931 | Morton \ M19 img122 | |
| Comparing downdraught and standard carburettors and discussing power curve improvements via better distribution. | 26th Feb 1931 | Morton \ M19 img123 | |
| The initial tests of Maybach dogs on the 14-EX vehicle, detailing issues with gear engagement. | 26th Feb 1931 | Morton \ M19 img124 | |
| Transmission jerks and crashes during gear changes. | 26th Feb 1931 | Morton \ M19 img125 | |
| Troubleshooting gearbox engagement issues, focusing on dog face angles and the preselector mechanism. | 26th Feb 1931 | Morton \ M19 img126 | |
| Required alterations to the 40/50 and 25 HP gearboxes, referencing Dr. Maybach's designs. | 2nd Mar 1931 | Morton \ M19 img127 | |
| Cross-section diagram and gear ratio table for a Maybach transmission for large vehicles. | 2nd Mar 1931 | Morton \ M19 img128 | |
| Discussion with Dr. Maybach concerning the design and operation of Maybach-type dog gearboxes. | 2nd Mar 1931 | Morton \ M19 img129 | |
| Continued report on Maybach gearbox and clutch systems, including diagrams. | 2nd Mar 1931 | Morton \ M19 img130 | |
| The preparation and modifications of car 27-EX for a visit to Le Canadel. | 3rd Mar 1931 | Morton \ M19 img131 | |
| Development of a 12-cylinder car and the decision to build their own engine. | 4th Mar 1931 | Morton \ M19 img132 | |
| Tests to investigate the cause of a 'boom' and vibration in the Phantom II model. | 1st Nov 1931 | Morton \ M19 img133 | |
| Tests to diagnose and resolve a 'boom' or vibration issue on Phantom I and Phantom II models. | 11th Mar 1931 | Morton \ M19 img134 | |
| Investigation into 'body boom' issues on a Phantom II car, comparing crankshaft and balance weight configurations. | 31th Mar 1931 | Morton \ M19 img135 | |
| Preliminary tests of an Epicyclic Easy Change Gearbox with a vacuum controlled twin top change gear. | 31th Mar 1931 | Morton \ M19 img136 | |
| Gearbox issues, focusing on noise, complexity, and gear modifications. | 31th Mar 1931 | Morton \ M19 img137 | |
| Analysis of gearbox noise and gear change issues, particularly concerning Maybach dogs and epicyclic gears. | 31th Mar 1931 | Morton \ M19 img138 | |
| Proposed measures to address excessive 'jellying' and body boom issues by testing modifications to engine feet, springs, and tyres. | 2nd Apr 1931 | Morton \ M19 img139 | |
| Analysis of vehicle booming, radiator movement, and front end shake, with proposed solutions including a diamond engine mounting. | 2nd Apr 1931 | Morton \ M19 img140 | |
| Methods to reduce frame 'jellying' by modifying engine mounts and frame stiffness. | 2nd Apr 1931 | Morton \ M19 img141 | |
| Noise issue with the Maybach jaws on a gearbox with an epicyclic third speed. | 2nd Apr 1931 | Morton \ M19 img142 | |
| The road tests of a Phantom II twin choke carburetter fitted to car 22-EX. | 2nd Apr 1931 | Morton \ M19 img143 | |
| Road tests of a twin carburetter, detailing fuel metering adjustments and performance on hill climbs. | 2nd Apr 1931 | Morton \ M19 img144 | |
| Progress report on carburettor and silencer testing, including notes on fuel consumption and ongoing development. | 2nd Apr 1931 | Morton \ M19 img145 | |
| Investigation into carburetter flooding and fuel starvation issues on a Phantom II during cornering. | 17th Apr 1931 | Morton \ M19 img146 | |
| Technical memorandum discussing carburettor float design and fuel level compensation for the R. engine and Phantom II. | 17th Apr 1931 | Morton \ M19 img147 | |
| Diagram showing a fuel level issue in a P.II. Twin Choke Carburetter when tilted. | 17th Apr 1931 | Morton \ M19 img148 | |
| Comparative performance tests between a Continental Phantom II and two Bentley models. | 17th Apr 1931 | Morton \ M19 img149 | |
| Performance comparison report of cars 26-EX and 27-EX against various Bentley and Maybach models. | 18th Apr 1931 | Morton \ M19 img150 | |
| Production tests and investigations into 'booming' complaints on Phantom II cars. | 18th Apr 1931 | Morton \ M19 img151 | |
| Investigation into the cause of a 'boom' or vibration in Phantom II cars at specific engine speeds. | 18th Apr 1931 | Morton \ M19 img152 | |
| Analysis of vibration and 'boom' resonance frequency in Phantom II cars, investigating potential causes and cures. | 18th Apr 1931 | Morton \ M19 img153 | |
| Customer complaints about booming noises and proposed modifications to the rear engine test and column support. | 18th Apr 1931 | Morton \ M19 img154 | |
| Test report on Phantom II rear axle rebound movement and springing. | 20th Apr 1931 | Morton \ M19 img155 | |
| Graph showing the effect of adjustable leak on Delco Lovejoy shock dampers on rear axle movement at various speeds. | 20th Apr 1931 | Morton \ M19 img156 | |
| Graph showing the effect of drilled valves on maximum rear axle movement over a level crossing. | 20th Apr 1931 | Morton \ M19 img157 | |
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