| Description | Date | Identifier | |
| Progress log from 1913 detailing development notes and test results for double rear brakes and other vehicle components. | 21th Feb 1913 | Box 182 \ M18 img094 | |
| Log of vehicle test reports, memos, and development notes from 1913-1914. | 25th Apr 1914 | Box 182 \ M18 img095 | |
| Log from 1913-1914 detailing tests, issues, and modifications related to brake and wheel systems. | 22th Sep 1913 | Box 182 \ M18 img096 | |
| Log of communications and test results concerning Dunlop wire wheels and brake systems. | 22th Sep 1913 | Box 182 \ M18 img097 | |
| Chronological log of vehicle issues, complaints, and test results from 1913-1914, focusing on brake performance. | 16th Jun 1914 | Box 182 \ M18 img098 | |
| Logbook page detailing reports and complaints about vehicle brake performance, with associated correspondence and action items from mid-1914. | 16th Jun 1914 | Box 182 \ M18 img099 | |
| Report detailing issues and potential solutions for brake system problems. | 16th Jun 1914 | Box 182 \ M18 img100 | |
| Collection of notes, memos, and telegrams regarding the testing and performance of various brake lining materials. | 16th Jun 1914 | Box 182 \ M18 img101 | |
| Comparing the performance and issues of various brake systems, including DRB and Central. | 16th Jun 1914 | Box 182 \ M18 img102 | |
| Collection of handwritten notes and reports on brake system performance and comparisons. | 28th Jul 1914 | Box 182 \ M18 img103 | |
| Log of engineering notes and communications regarding vehicle issues, tests, and customer feedback. | 28th Jul 1914 | Box 182 \ M18 img104 | |
| Note regarding vehicle performance in muddy conditions. | 18th Jun 1914 | Box 182 \ M18 img105 | |
| Log of handwritten internal communications and decisions regarding brake system development and testing. | 29th Jul 1914 | Box 182 \ M18 img106 | |
| Series of handwritten notes and memos from July and August 1914 detailing brake system development and testing. | 30th Jul 1914 | Box 182 \ M18 img107 | |
| Series of dated notes discussing issues and improvements related to brake systems and rivets. | 30th Jul 1914 | Box 182 \ M18 img108 | |
| Series of internal notes and correspondence from 1914 regarding brake performance, materials, potential upgrades, and customer feedback. | 30th Jul 1914 | Box 182 \ M18 img109 | |
| And replies detailing extensive brake performance tests and material analysis. | 24th Aug 1914 | Box 182 \ M18 img110 | |
| By F.H. Royce discussing improvements to brake design, focusing on materials, rivets, and cooling ribs. | 24th Aug 1914 | Box 182 \ M18 img111 | |
| Log of correspondence and notes on various automotive topics. | 30th Aug 1921 | Box 182 \ M18 img112 | |
| On tests conducted for tappet clearance and noise on the 40/50 standard camshaft. | 24th Nov 1931 | Box 182 \ M19 img001 | |
| Position and performance of electric clocks for cars. | 2nd Dec 1930 | Box 182 \ M19 img002 | |
| The investigation and testing of various electric car clocks, with a view to developing one for the Phantom II chassis. | 16th Dec 1930 | Box 182 \ M19 img003 | |
| Short memo regarding a faulty 'Delco' shock absorber and its replacement. | 16th Dec 1930 | Box 182 \ M19 img004 | |
| Carburettor noise issues and potential solutions for twin carburettor setups. | 20th Dec 1930 | Box 182 \ M19 img005 | |
| Report comparing the performance of a Delco Remy ignition coil with a Lucas coil and the company's own standard. | 24th Dec 1930 | Box 182 \ M19 img006 | |
| Tests conducted on crankshaft dimensions for a 25 HP engine. | 15th Jan 1931 | Box 182 \ M19 img007 | |
| Technical memo discussing the effects of crankshaft pin size and balance weights on bearing loads and critical speed. | 15th Jan 1931 | Box 182 \ M19 img008 | |
| Expressing dissatisfaction with the progress on a compression ignition engine and calling for new designs. | 19th Jan 1931 | Box 182 \ M19 img009 | |
| The characteristics and output performance of Lucas dynamos. | 5th Feb 1931 | Box 182 \ M19 img010 | |
| Comparison between Lucas E.575 dynamos and the company's own make, focusing on winding schemes, switching, and output curves. | 1st Feb 1931 | Box 182 \ M19 img011 | |
| Continued analysis of dynamo output curves, comparing different models and operating conditions. | 1st Feb 1931 | Box 182 \ M19 img012 | |
| Comparison of a Lucas machine's output curve and physical characteristics against a Rolls-Royce 40/50 machine. | 1st Feb 1931 | Box 182 \ M19 img013 | |
| New dashboard-controlled shock absorber design, proposing modifications with 'Delco' features to reduce cost. | 6th Feb 1931 | Box 182 \ M19 img014 | |
| Issues with shock absorbers and proposals for modifications and future designs. | 8th Feb 1931 | Box 182 \ M19 img015 | |
| Shock absorber design, issues, and proposed modifications for the Phantom II model. | 9th Feb 1931 | Box 182 \ M19 img016 | |
| Comparing the efficiency, output, and design of a Lucas dynamo against an in-house model. | 9th Feb 1931 | Box 182 \ M19 img017 | |
| Different types of centralised chassis lubrication systems. | 10th Feb 1931 | Box 182 \ M19 img018 | |
| Outlining a programme for modifying the hydraulic dampers and front axle control on the Phantom II. | 12th Feb 1931 | Box 182 \ M19 img019 | |
| Design and application of dampers for the 25 HP and Phantom II models, including proposals for future horizontal dampers. | 12th Feb 1931 | Box 182 \ M19 img020 | |
| Technical memorandum discussing shock damper design, noise issues, and potential improvements. | 14th Feb 1931 | Box 182 \ M19 img021 | |
| Piston inertia torque and its effect on engine roughness for various engine types. | 17th Feb 1933 | Box 182 \ M19 img022 | |
| Experiments to reduce engine vibration and booms by removing or lightening the flywheel. | 17th Feb 1931 | Box 182 \ M19 img023 | |
| Experiments with different flywheel designs and extra bearings to reduce engine roughness and vibrations. | 17th Feb 1931 | Box 182 \ M19 img024 | |
| Inertia torques and crankshaft stiffness in 6 and 8 cylinder engines. | 17th Feb 1932 | Box 182 \ M19 img025 | |
| Monthly report on customer complaints regarding vibrations, brake inefficiency, and shock damper issues for 25HP and Phantom models. | 18th Mar 1933 | Box 182 \ M19 img026 | |
| Technical report on development and issues with springing, fabric couplings, steering, and clutches. | 1st Feb 1931 | Box 182 \ M19 img027 | |
| Ongoing issues and resolutions for clutch, exhaust, slipper drive, and cooling systems. | 18th Feb 1931 | Box 182 \ M19 img028 | |
| Issues and potential improvements for various vehicle components, including ignition coils, servo, and propeller shaft joints. | 18th Mar 1931 | Box 182 \ M19 img029 | |
| Customer complaints and engineering solutions for various vehicle components including petrol tanks, radiators, and dynamos. | 18th Feb 1931 | Box 182 \ M19 img030 | |
| Failures and subsequent fixes for various automotive components, including the battery box, lubrication system, carburettor, and radiator. | 18th Feb 1931 | Box 182 \ M19 img031 | |
| Status and resolutions for several technical items, including leaks, tubes, wires, and drives. | 18th Feb 1931 | Box 182 \ M19 img032 | |
| The trial of a Maybach car in Berlin, focusing on its 4-speed silent gearbox. | 2nd Mar 1931 | Box 182 \ M19 img033 | |
| Test report evaluating the gearbox, engine performance, steering, and brakes of a vehicle. | 2nd Mar 1931 | Box 182 \ M19 img034 | |
| Summary and recommendation concerning the potential purchase of a Maybach car or gearbox for comparative analysis. | 2nd Mar 1931 | Box 182 \ M19 img035 | |
| Outlining suggestions for improving existing Phantom II rear hydraulic dampers to address service complaints. | 4th Mar 1931 | Box 182 \ M19 img036 | |
| Damper performance, potential complaints, and a production proposal for a new piston design. | 4th Mar 1932 | Box 182 \ M19 img037 | |
| High-speed braking tests and adjustable hydraulic shock absorbers. | 6th Mar 1931 | Box 182 \ M19 img038 | |
| Road tests and design issues of a single-line petrol gauge for the Phantom II. | 9th Mar 1931 | Box 182 \ M19 img039 | |
| Proposal to incorporate a Warner synchronising mechanism into the Japan III gearbox, comparing it to Chrysler and Maybach systems. | 14th Mar 1931 | Box 182 \ M19 img040 | |
| Reproducible gearbox crash, referencing the Maybach change gear vacuum control. | 16th Mar 1931 | Box 182 \ M19 img041 | |
| New Bentley six-cylinder four-litre engine featuring the latest Ricardo patent head. | 19th Mar 1931 | Box 182 \ M19 img042 | |
| Blueprint of a Ricardo Patent Cylinder Head design. | 19th Mar 1931 | Box 182 \ M19 img043 | |
| The causes and reduction of 'booming' in Phantom II and 25 HP cars. | 21th Mar 1931 | Box 182 \ M19 img044 | |
| Report analyzing various engine mounting systems and their associated issues like booming and jellying. | 21th Mar 1931 | Box 182 \ M19 img045 | |
| Technical report comparing chassis features, booming issues, and design differences between Phantom I and Phantom II models. | 21th Mar 1931 | Box 182 \ M19 img046 | |
| Causes and solutions for booming noises in different car body styles. | 21th Mar 1931 | Box 182 \ M19 img047 | |
| List of points discussing vehicle performance, complaints, and component comparisons. | 21th Mar 1931 | Box 182 \ M19 img048 | |
| Summary of experimental tests conducted on power unit, engine mounting, and chassis components. | 21th Mar 1931 | Box 182 \ M19 img049 | |
| Various tests performed to diagnose vibration and booming issues, comparing Phantom I and Phantom II models. | 19th Mar 1931 | Box 182 \ M19 img050 | |
| The testing of a low-cost American gearbox fitted with a spool gear third speed. | 19th Mar 1931 | Box 182 \ M19 img051 | |
| Experiments to improve fuel distribution with a downdraught carburetter. | 2nd Apr 1931 | Box 182 \ M19 img052 | |
| Monthly report reviewing customer complaints about vehicle faults and the status of fixes. | 8th Apr 1931 | Box 182 \ M19 img053 | |
| Status report on various vehicle component issues, modifications, and testing. | 8th Apr 1931 | Box 182 \ M19 img054 | |
| The status of various component issues, including servos, thrust races, telegauges, joints, starter motors, and petrol tank leaks. | 8th Apr 1931 | Box 182 \ M19 img055 | |
| Faults and modifications on various car components like radiators, fan pulleys, oil pumps, and engines. | 8th Apr 1931 | Box 182 \ M19 img056 | |
| Technical report detailing various vehicle faults and the actions taken to resolve them. | 8th Apr 1931 | Box 182 \ M19 img057 | |
| The status of water pump fabric drive shields and engine water leaks from cylinders. | 8th Apr 1931 | Box 182 \ M19 img058 | |
| Trial report on a Buick car fitted with a synchro mesh easy change gearbox. | 21th Apr 1931 | Box 182 \ M19 img059 | |
| Comparing the crankcase ventilation system and resulting oil smell of a 6-cylinder Buick to their own vehicle. | 22th Apr 1931 | Box 182 \ M19 img060 | |
| Research into easy change gear systems, including Voisin magnetic tops, Graham Paige synchro-mesh gearboxes, and Buick components. | 2nd May 1931 | Box 182 \ M19 img061 | |
| Report comparing the Kismet '31 Tyre Tester with the Schrader gauge, recommending it for standardisation. | 4th May 1931 | Box 182 \ M19 img062 | |
| Referencing a sketch and description of a 'Voisin Gear' from a 1930 Paris Show report. | 5th May 1931 | Box 182 \ M19 img063 | |
| Fabric-type petrol pump and comparing it to the A.C. pump manufactured by General Motors. | 5th May 1931 | Box 182 \ M19 img064 | |
| Analysis of carburetter float chambers, comparing different models for performance during fast cornering and potential flooding issues. | 7th May 1931 | Box 182 \ M19 img065 | |
| Carburettor diffuser flooding, the use of accelerating pumps, and future developments for supercharged aero engines. | 7th May 1931 | Box 182 \ M19 img066 | |
| Technical memorandum reviewing the position of road springs and the effects of fitting low-rated springs. | 13th May 1931 | Box 182 \ M19 img067 | |
| The maximum stress in spring leaves and the standardization of springs for 25 HP and 40/50 models. | 13th May 1931 | Box 182 \ M19 img068 | |
| Suggesting a solution for rear foot brake groans on the Phantom model. | 19th May 1931 | Box 182 \ M19 img069 | |
| The results of radiator tests at Brooklands, comparing hexagonal and square tube designs. | 19th May 1931 | Box 182 \ M19 img070 | |
| Technical comparison of radiator and bonnet designs, including hexagon tubes and shuttered versus louvred bonnets. | 19th May 1931 | Box 182 \ M19 img071 | |
| Radiator efficiency improvements and the need for a wind tunnel for further development. | 19th May 1931 | Box 182 \ M19 img072 | |
| Cover letter discussing experiments with the shimmy shackle, attaching a report on Delco Shock Absorbers and the synchro mesh gearbox. | 21th May 1931 | Box 182 \ M19 img073 | |
| Power output, valve lifts and camshaft tests for 25 HP and 40/50 engines. | 22th May 1931 | Box 182 \ M19 img074 | |
| The effect of balance weights on flywheel wobble for the Phantom II and 25 HP models. | 23th May 1931 | Box 182 \ M19 img075 | |
| Flywheel balance weight investigations and further test requirements. | 23th May 1931 | Box 182 \ M19 img076 | |
| Internal memorandum discussing radiator design choices to prevent customer overheating complaints. | 28th May 1931 | Box 182 \ M19 img077 | |
| American engine and gearbox design practices, seeking opinions on multi-cylinder engines, gearboxes, and silent helical gears. | 29th May 1931 | Box 182 \ M19 img078 | |
| The development and testing of a double valve for hydraulic shock absorbers. | 1st Jun 1931 | Box 182 \ M19 img079 | |
| Blueprint detailing designs for a double piston damper and air vent ball valves. | 1st Jun 1931 | Box 182 \ M19 img080 | |
| Investigation and resolution of noise issues in a double piston damper during testing. | 1st Jun 1931 | Box 182 \ M19 img081 | |
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