| Description | Date | Identifier | |
| The correct types of lamp bulbs for the New Phantom, 20 HP, and Silver Ghost models. | 9th Dec 1925 | Box 71 \ 2 scan0009 | |
| The exchange of large side lamp bulbs for a smaller preferred type. | 15th Dec 1925 | Box 71 \ 2 scan0010 | |
| Letter regarding the return and replacement of incorrectly supplied side lamp bulbs. | 15th Dec 1925 | Box 71 \ 2 scan0011 | |
| Lighting system on the New Phantom Car in America. | 30th Dec 1925 | Box 71 \ 2 scan0012 | |
| Letter regarding the high voltage output of the New Phantom's generator and its incompatibility with standard 12-volt light bulbs. | 11th Dec 1925 | Box 71 \ 2 scan0013 | |
| Difficulties with the 12-volt generator and lamp bulbs on the New Phantom car in America. | 31th Dec 1925 | Box 71 \ 2 scan0014 | |
| Technical discussion on vehicle electrical system voltage, battery charging rates, and lamp longevity on the Phantom generator. | 31th Dec 1925 | Box 71 \ 2 scan0015 | |
| Technical note on battery E.M.F. and charging characteristics. | 31th Dec 1925 | Box 71 \ 2 scan0016 | |
| Requesting agreement to supply information about the New Phantom Car's 12 Volt Generator to America. | 7th Jan 1926 | Box 71 \ 2 scan0017 | |
| Cause of side lamps burning out, attributing the issue to faulty bulbs from the manufacturer. | 23th Apr 1926 | Box 71 \ 2 scan0018 | |
| Investigation into the cause of side lamps burning out, concluding the fault lay with the lamp bulbs, not the dynamos. | 23th Apr 1926 | Box 71 \ 2 scan0019 | |
| Confirming receipt of lamps in relation to Chassis No. 11-EX. | 30th Jun 1926 | Box 71 \ 2 scan0020 | |
| Insufficiency of the lamps on the 10->EX car and the need for a suitable replacement. | 19th Jul 1926 | Box 71 \ 2 scan0021 | |
| Alternative headlamp options to Lucas, specifically the Carl Zeiss lamp, for the 10-EX model. | 23th Jul 1926 | Box 71 \ 2 scan0022 | |
| New headlamp design by Messrs. Lucas, requesting ideas on size and shape. | 26th Aug 1926 | Box 71 \ 2 scan0023 | |
| Letter to J. Lucas Ltd. giving feedback and specifications for a new headlamp design. | 30th Aug 1926 | Box 71 \ 2 scan0024 | |
| Short memo confirming arrangements to fit head lamp brackets. | 30th Dec 1926 | Box 71 \ 2 scan0025 | |
| The supply of Zeiss headlamps and related parts for the 10-EX model. | 2nd Jan 1927 | Box 71 \ 2 scan0026 | |
| Extract memo discussing the brightness of side lights and suggesting a reduction in current for parking. | 11th Oct 1927 | Box 71 \ 2 scan0027 | |
| Sending a design for a rear number plate and tail lamp to coachbuilders and requesting more lamp holders. | 4th Nov 1927 | Box 71 \ 2 scan0028 | |
| Returning a new sample Lucas lamp for a decision on its retention or modification. | 10th Nov 1927 | Box 71 \ 2 scan0029 | |
| Insufficient dynamo output for 20HP and 40/50 models, with proposed solutions. | 13th Mar 1928 | Box 71 \ 2 scan0030 | |
| 9000-mile test of an experimental auto charge control switch and lighting system on a Phantom chassis with a sports body. | 17th Mar 1928 | Box 71 \ 2 scan0031 | |
| Note specifying the lamps fitted to a chassis ready for delivery from the Test Dept. | 30th Apr 1928 | Box 71 \ 2 scan0032 | |
| Current taken by side lamps and a recommendation for a specific low wattage bulb. | 4th May 1928 | Box 71 \ 2 scan0033 | |
| Replacement of 9-watt side lamp bulbs with ones that take less current. | 7th May 1928 | Box 71 \ 2 scan0034 | |
| Standardization of side lamp bulbs to a lower capacity model at Mr. Royce's request. | 9th May 1928 | Box 71 \ 2 scan0035 | |
| Issues with fitting a special Lucas R.160.S. lamp to the Phantom model. | 7th Jun 1929 | Box 71 \ 2 scan0036 | |
| The positioning and brackets for Phantom headlamps. | 30th Jul 1928 | Box 71 \ 2 scan0037 | |
| Request for a report on two sample headlamps referred to in an attached letter from Philips Lamps Ltd. | 5th Mar 1929 | Box 71 \ 2 scan0038 | |
| Returning incorrect lamp bulbs which were not the bifocal type as requested. | 3rd Mar 1929 | Box 71 \ 2 scan0039 | |
| Issues with overlapping orders and the supply of obsolete lamps for cars. | 22th Apr 1929 | Box 71 \ 2 scan0040 | |
| Proposal to trial a new Lucas centre lamp as a replacement for the Stephan Grebel model on Phantom cars. | 23th May 1929 | Box 71 \ 2 scan0041 | |
| Blueprint and production of a modified Centre Lamp Bracket stay with increased thickness. | 21th Sep 1929 | Box 71 \ 2 scan0042 | |
| Request to produce two modified centre lamp stays for a 40/50 chassis for comparison with the standard bracket. | 24th Sep 1929 | Box 71 \ 2 scan0043 | |
| Testing of new type steel artillery wheels for the 40/50 HP chassis. | 30th Dec 1924 | Box 71 \ 2 scan0044 | |
| Investigating the causes of high-speed steering wobbles. | 12th Jun 1925 | Box 71 \ 2 scan0045 | |
| Investigating the causes of wheel wobble, focusing on tyre imbalance and deflection. | 12th Jun 1925 | Box 71 \ 2 scan0046 | |
| Investigations into high-speed wheel wobble using a Phantom car. | 15th Sep 1925 | Box 71 \ 2 scan0047 | |
| The causes and contributing factors of tyre wobble, such as damping, tread pattern and road surface conditions. | 15th Sep 1925 | Box 71 \ 2 scan0048 | |
| Weight reduction efforts on the Phantom chassis. | 29th Sep 1925 | Box 71 \ 2 scan0049 | |
| Technical memorandum detailing modifications to pistons, steering, axles, dampers, and magnetos. | 14th May 1926 | Box 71 \ 2 scan0050 | |
| Internal discussion on vehicle design choices, features, and cost implications for future models. | 14th May 1926 | Box 71 \ 2 scan0051 | |
| Continued document outlining future hopes for manufacturing improvements and cost savings on chassis. | 10th Jan 1927 | Box 71 \ 2 scan0052 | |
| Proposing a reduction in the width of standard wire wheels for the Phantom model. | 10th Jan 1927 | Box 71 \ 2 scan0053 | |
| Drawing showing the wheel arch clearance for the Phantom sports chassis. | 25th Oct 1927 | Box 71 \ 2 scan0054 | |
| From 'R.' questioning why the company does not use smaller road wheels on its cars. | 14th May 1928 | Box 71 \ 2 scan0055 | |
| Steering improvements, wheel shimmy, side steering tube springs, and new adjustable dampers. | 4th Aug 1928 | Box 71 \ 2 scan0056 | |
| Letter discussing the shimmy effect, moment of inertia, and specifications for 20-inch wheels and tires. | 17th Sep 1928 | Box 71 \ 2 scan0057 | |
| List of weights and specifications for different types of tires and wheels. | 17th Sep 1928 | Box 71 \ 2 scan0058 | |
| Comparison of the power output at the road wheels for the Phantom and S.S. cars. | 22th Aug 1929 | Box 71 \ 2 scan0059 | |
| Confirming the standardisation of the 20-inch rim and 'Fort' type tyre for the L.2. series. | 1st Feb 1930 | Box 71 \ 2 scan0060 | |
| Decision on wheel and tyre specifications for the L.2B series vehicles. | 4th Feb 1930 | Box 71 \ 2 scan0061 | |
| Requesting an alteration to six wheels to increase the vehicle's track. | 14th Feb 1930 | Box 71 \ 2 scan0062 | |
| Accompanying a blueprint for a new wheel, G.78339, for the 40/50 HP Chassis. | 21th Feb 1930 | Box 71 \ 2 scan0063 | |
| Secret memorandum on the design and high-speed testing of balloon tyres for the E.A.C.11 model. | 17th Oct 1924 | Box 71 \ 2 scan0064 | |
| Note detailing a reduction in tyre section for the wheels and tyres of the 20 HP car. | 18th Sep 1925 | Box 71 \ 2 scan0065 | |
| The causes of high-speed steering wobbles. | 18th Sep 1925 | Box 71 \ 2 scan0066 | |
| Tests and observations on wheel wobble. | 12th Jun 1925 | Box 71 \ 2 scan0067 | |
| The effects of wheel toe settings on vehicle wobble. | 18th Sep 1925 | Box 71 \ 2 scan0068 | |
| The mechanics of a self-exciting, high-speed wheel wobble. | 18th Sep 1925 | Box 71 \ 2 scan0069 | |
| Analysing high-speed wheel wobble, gyroscopic couple, and potential solutions. | 12th Jun 1925 | Box 71 \ 2 scan0070 | |
| The performance of rear springing and tyres for the 7-EX car, with recommendations for semi-balloon tyres and hydraulic shock dampers. | 1st Feb 1926 | Box 71 \ 2 scan0071 | |
| Technical memo discussing potential improvements for the Phantom model's rear springs, shock dampers, and tyres. | 15th Mar 1926 | Box 71 \ 2 scan0072 | |
| Improvements to vehicle ride quality through adjustments to tyres, cushions, shock dampers, and springs. | 19th Mar 1926 | Box 71 \ 2 scan0073 | |
| Unsatisfactory ride quality in the rear seats of a Phantom model, with suggestions for modifications to springs, dampers, and tyres. | 19th Mar 1926 | Box 71 \ 2 scan0074 | |
| Proposing the adoption of larger, lower-pressure tyres to improve ride comfort and compete with other manufacturers. | 24th Mar 1926 | Box 71 \ 2 scan0075 | |
| Car suspension, tyres, and shock dampers. | 31th Mar 1926 | Box 71 \ 2 scan0076 | |
| Vehicle suspension, tyre performance, and handling characteristics for various models. | 31th Mar 1926 | Box 71 \ 2 scan0077 | |
| Steering, tyre, shock absorber, and suspension design. | 1st Apr 1926 | Box 71 \ 2 scan0078 | |
| High speed steering wobbles experienced on car 7-EX with medium pressure tyres. | 1st Apr 1926 | Box 71 \ 2 scan0079 | |
| Technical memo detailing modifications and test results for various vehicle components including pistons, steering, axles, and magnetos. | 14th May 1926 | Box 71 \ 2 scan0080 | |
| Design choices for chassis components, balancing cost against performance and market requirements. | 14th May 1926 | Box 71 \ 2 scan0081 | |
| Hopes for future improvements and cost savings related to chassis design and production. | 29th May 1926 | Box 71 \ 2 scan0082 | |
| Test results and recommendations for Phantom model improvements regarding tyres, steering, and suspension. | 29th May 1926 | Box 71 \ 2 scan0083 | |
| Advantages and disadvantages of offering low pressure tyres for Phantom & Goshawk chassis. | 9th Mar 1926 | Box 71 \ 2 scan0084 | |
| Instruction arranging for the collection of tyres and wheels from Lillie Hall. | 28th Oct 1926 | Box 71 \ 2 scan0085 | |
| Tyre recommendations for a high-speed chassis, advising high-pressure tyres. | 1st Jan 1927 | Box 71 \ 2 scan0086 | |
| Introduction and performance of new silent tread tyres. | 9th Oct 1928 | Box 71 \ 2 scan0087 | |
| The standardisation of 20' rims and 'Fort' type tyres for the L.2. Series. | 2nd Mar 1930 | Box 71 \ 2 scan0088 | |
| The decision on wheel and tyre specifications for the L.2B series. | 4th Feb 1930 | Box 71 \ 2 scan0089 | |
| Increasing the tyre balance weights for the 40/50 car to match the 20 HP standard. | 22th Feb 1930 | Box 71 \ 2 scan0090 | |
| Comparison of vehicle weights and braking performance for 40/50 HP cars and a Hispano Suiza. | 15th Nov 1923 | Box 71 \ 2 scan0091 | |
| Secret memorandum discussing potential improvements for an engine and chassis across eight points. | 10th Mar 1924 | Box 71 \ 2 scan0092 | |
| Improvements for silencers, clutches, and brakes, alongside a motivational call to action. | 1st Jun 1924 | Box 71 \ 2 scan0093 | |
| Secret memo from Mr. Royce regarding the weight of the crankcase and a request to investigate reducing its wall thickness. | 1st Jun 1924 | Box 71 \ 2 scan0094 | |
| The weights of the components for an EAC.11 radiator. | 20th Mar 1924 | Box 71 \ 2 scan0095 | |
| Spring deflection and ground clearance for 'V' Series EAC cars under 'normal' and 'loaded' conditions. | 16th May 1925 | Box 71 \ 2 scan0096 | |
| Querying the comparative weights of Dunlop and Rudge-Whitworth front axle hubs for the New Phantom model. | 9th Sep 1925 | Box 71 \ 2 scan0097 | |
| Progress of weight reduction on the Phantom chassis. | 29th Sep 1925 | Box 71 \ 2 scan0098 | |
| Weight-saving campaign for the New Phantom, comparing performance with Bentley and Hispano models. | 13th Oct 1925 | Box 71 \ 2 scan0099 | |
| Weight reduction for the 'Phantom' model, comparing long and short chassis types. | 15th Oct 1925 | Box 71 \ 2 scan0100 | |
| Use of duralumin rockers and bearing caps to reduce weight on the 'Phantom' model. | 15th Oct 1925 | Box 71 \ 2 scan0101 | |
| Requesting a comparison of weights for the 20 HP axle and the 40/50 HP rear brake unit against other specified parts. | 28th Oct 1925 | Box 71 \ 2 scan0102 | |
| Weights of the EAC cylinder block and head. | 10th Nov 1925 | Box 71 \ 2 scan0103 | |
| Weights of the EAC cylinder block and head. | 10th Nov 1925 | Box 71 \ 2 scan0104 | |
| Weight-reducing campaign for Phantom brake drums, suggesting the deletion of ribs. | 8th Nov 1925 | Box 71 \ 2 scan0105 | |
| From Mr. Royce detailing proposals for reducing the weight of the Phantom engine. | 11th Nov 1925 | Box 71 \ 2 scan0106 | |
| List of proposed alterations and simplifications for an engine's crankcase, studs, and valve gear cover. | 11th Nov 1925 | Box 71 \ 2 scan0107 | |
| With a sketch discussing design modifications for an aluminium head, crankcase, and valve tappet rods. | 1st Dec 1925 | Box 71 \ 2 scan0108 | |
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