| Description | Date | Identifier | |
| Comparative table of different front wheel brake schemes. | 29th Apr 1924 | Box 182 \ M20 \ M20.2 img033 | |
| Schematic diagram of a four-wheel braking system, showing linkages and calculations. | 24th Jun 1925 | Box 182 \ M20 \ M20.2 img034 | |
| Schematic of a servo-assisted braking system with force calculations. | 31th Oct 1924 | Box 182 \ M20 \ M20.2 img035 | |
| Schematic diagram of a four-wheel brake servo system with force calculations. | 31th Oct 1924 | Box 182 \ M20 \ M20.2 img036 | |
| EAC engine over-run vibrations, detailing tests conducted with longer connecting rods. | 3rd May 1924 | Box 182 \ M20 \ M20.2 img037 | |
| Four-wheel brake issues and a fatigue fracture of a cross steering tube. | 1st May 1924 | Box 182 \ M20 \ M20.2 img038 | |
| Secret memorandum on testing a car's servo-assisted brakes with a new reduction scheme and comparing it to the Hispano system. | 9th May 1924 | Box 182 \ M20 \ M20.2 img039 | |
| Bench test results for Ni-Fe (Nickel-Iron) and Alklum alkaline batteries. | 15th May 1924 | Box 182 \ M20 \ M20.2 img040 | |
| The effects of unequal front braking and pivot lean on the steering of a 40/50 HP car. | 15th May 1924 | Box 182 \ M20 \ M20.2 img041 | |
| The effect of braking on steering, comparing a car with and without a torque arm fitted. | 15th May 1924 | Box 182 \ M20 \ M20.2 img042 | |
| Steering tendency effect caused by braking and front axle/spring configuration. | 15th May 1924 | Box 182 \ M20 \ M20.2 img043 | |
| Steering spring loads to correct for diving and compromise between steering wobbles, springiness, and road shocks. | 1st May 1924 | Box 182 \ M20 \ M20.2 img044 | |
| The bench tests of a Scintilla Magneto Type AN-6-A. | 19th May 1924 | Box 182 \ M20 \ M20.2 img045 | |
| Further figures taken in connection with twists of the front axle, comparing results from cars with the heaviest and lightest type springs. | 17th May 1924 | Box 182 \ M20 \ M20.2 img046 | |
| The measurement of front axle twist due to braking. | 17th May 1924 | Box 182 \ M20 \ M20.2 img047 | |
| Torque multiplication and distribution ratios for a brake linkage scheme. | 19th May 1924 | Box 182 \ M20 \ M20.2 img048 | |
| The problems and disadvantages of using floating bushes for steering pivots. | 21th May 1924 | Box 182 \ M20 \ M20.2 img049 | |
| Four-wheel brakes, discussing braking balance and performance on greasy roads. | 1st May 1924 | Box 182 \ M20 \ M20.2 img050 | |
| The dangers of wheel locking and the challenges of achieving equal braking. | 20th Mar 1924 | Box 182 \ M20 \ M20.2 img051 | |
| Note on the considerable variation in braking performance between different cars. | 21th May 1924 | Box 182 \ M20 \ M20.2 img052 | |
| 10,000-mile test in France, detailing issues with a Barker open-touring body. | 1st May 1924 | Box 182 \ M20 \ M20.2 img053 | |
| The considerable variation in braking performance between different cars. | 21th May 1924 | Box 182 \ M20 \ M20.2 img054 | |
| Complaints and suggested improvements following a 10,000 miles test in France. | 23th May 1924 | Box 182 \ M20 \ M20.3 img001 | |
| Complaint regarding the hood being liftable from its pegs, with sheared pins and loose sockets. | 23th May 1924 | Box 182 \ M20 \ M20.3 img002 | |
| The fitting of a spring to the E.A.C. clutch between the crankshaft and universal joint. | 23th May 1924 | Box 182 \ M20 \ M20.3 img003 | |
| The adopted scheme of brakes and servo operation. | 24th May 1924 | Box 182 \ M20 \ M20.3 img004 | |
| Front braking, comparing a servo system to ordinary brakes and detailing adjustment difficulties. | 24th May 1924 | Box 182 \ M20 \ M20.3 img005 | |
| Performance and specifications of a Scintilla magneto for the E.A.C.2 engine. | 26th May 1924 | Box 182 \ M20 \ M20.3 img006 | |
| Comparing the slow-speed sparking characteristics of different magneto models. | 26th May 1924 | Box 182 \ M20 \ M20.3 img007 | |
| Preliminary tests of an EAC fixed choke type carburetter. | 12th Jul 1923 | Box 182 \ M20 \ M20.3 img008 | |
| Continuation page of a report on experiments with a Knave carburetter, needle valves, and a vaporiser. | 29th May 1924 | Box 182 \ M20 \ M20.3 img009 | |
| Performance data comparison for E.A.C. and Knave fixed choke carburettors, with a diagram showing an alteration to an air valve deflector. | 29th May 1924 | Box 182 \ M20 \ M20.3 img010 | |
| Tests to prevent brake jaggers. | 1st Jun 1924 | Box 182 \ M20 \ M20.3 img011 | |
| Axle jaggering and twist under various conditions of frictional resistance. | 2nd Jun 1924 | Box 182 \ M20 \ M20.3 img013 | |
| Adopted braking scheme and its modifications. | 4th Jun 1924 | Box 182 \ M20 \ M20.3 img014 | |
| Issues with brake servo noise, vibration, and heavy steering. | 4th Jun 1924 | Box 182 \ M20 \ M20.3 img015 | |
| Diagram and table detailing the servo multiplication of torque for a braking system. | 4th Jun 1934 | Box 182 \ M20 \ M20.3 img017 | |
| 'Rectaskid' anti-skid and springing improvement fittings. | 11th Jun 1924 | Box 182 \ M20 \ M20.3 img018 | |
| Page fragment discussing a limitation on cars due to ineffective brakes. | 19th Jun 1924 | Box 182 \ M20 \ M20.3 img021 | |
| Issues with the brake scheme, focusing on pedal pressure and a chronic complaint. | 19th Jun 1924 | Box 182 \ M20 \ M20.3 img029 | |
| Policy revision for the Universal Gearbox due to a decision about Phantom III cars. | 8th Nov 1937 | Box 182 \ M21 img001 | |
| Piston modifications, including increasing skirt length and using spring pressure to reduce engine noise. | 24th Sep 1919 | Box 182 \ M21 img002 | |
| Rushed inspection report on a Fiat car, model X4133. | 25th May 1922 | Box 182 \ M21 img003 | |
| Typed note outlining shortcomings related to springing, carburation, and chassis size. | 27th Dec 1922 | Box 182 \ M21 img004 | |
| Goshawk I chassis, comparing its flexible engine suspension to other models, and urging for consistent compression ratios. | 27th Dec 1922 | Box 182 \ M21 img005 | |
| Query regarding payment for petrol and a new inner tube for a Hawk-Northcliffe chassis spare wheel. | 16th Dec 1922 | Box 182 \ M21 img006 | |
| Solutions to the warping of the Goshawk II clutch plate. | 7th Sep 1921 | Box 182 \ M21 img007 | |
| Directive on the progress of experimental work, halting work on 'Vulture' or 'Buzzard' to prioritize parts for a finished engine or chassis. | 1st Apr 1921 | Box 182 \ M21 img008 | |
| With diagrams showing six different designs for a plate, featuring variations in materials, slots, and corrugated centers. | 8th Sep 1921 | Box 182 \ M21 img009 | |
| Letter agreeing to contribute to a presentation for Mr. Basil Johnson. | 14th Dec 1928 | Box 182 \ M21 img010 | |
| Feedback on the design of a battery lead and terminal, with a suggested modification to aid soldering. | 1st Jul 1919 | Box 182 \ M21 img011 | |
| Purpose and potential issues of a small vent hole in an R.R.C.H. carburettor. | 28th Jun 1917 | Box 182 \ M21 img012 | |
| Reliability and testing of Watford magnetos based on a report from the Air Board. | 1st May 1917 | Box 182 \ M21 img013 | |
| Performance of engines in aircraft, focusing on power, weight, and propeller compatibility. | 30th Jul 1917 | Box 182 \ M21 img014 | |
| Aircraft engine performance, climbing capabilities, and comparisons with German equipment. | 1st Jul 1917 | Box 182 \ M21 img015 | |
| From 'R.' complaining about the unsuitably heavy Maythorn limousine body on a 20HP chassis. | 1st Sep 1925 | Box 182 \ M21 img016 | |
| Poor state of a 'top heavy' car body and recommending its modification or disposal. | 26th Aug 1925 | Box 182 \ M21 img017 | |
| Weekly comparison of 20 HP chassis orders for the financial years 1922-1923 and 1923-1924. | 24th Jan 1924 | Box 182 \ M21 img018 | |
| Weekly comparison of 40/50 HP chassis orders received between the 1922-1923 and 1923-1924 financial years. | 19th Jan 1924 | Box 182 \ M21 img019 | |
| Typed summary of establishment charges per chassis from 1921 to 1923. | 27th Jul 1923 | Box 182 \ M21 img020 | |
| Costings sheet for accessories for a 'Goshawk' open body vehicle, showing two price columns. | 17th Sep 1922 | Box 182 \ M21 img021 | |
| Outlining the assumptions used to calculate anticipated bank balances. | 4th Oct 1912 | Box 182 \ M21 img022 | |
| Departmental memo discussing the ergonomics and safety of pedal placement, considering drivers of different heights and emergency situations. | 4th Oct 1912 | Box 182 \ M21 img023 | |
| Noting marks on the dashboard caused by drivers' toes. | 30th Apr 1912 | Box 182 \ M21 img024 | |
| Explaining the company's unfavorable cash position due to chassis orders, production delays, and slow government payments. | 18th Jan 1923 | Box 182 \ M21 img025 | |
| Summary of chassis deliveries, sales, and orders for the period of May 19 to July 14, 1925. | 21th Jul 1925 | Box 182 \ M21 img026 | |
| Weekly comparison of car orders for 1922 and 1923, broken down by model. | 19th Nov 1919 | Box 182 \ M21 img027 | |
| Price comparison of the Goshawk model against works cost and a schedule of competitive cars. | 19th Sep 1922 | Box 182 \ M21 img028 | |
| Comparative table of specifications and prices for the 40/50 model against its competitors. | 19th Sep 1922 | Box 182 \ M21 img029 | |
| Price comparison document for the Goshawk model against competitor vehicles. | 19th Sep 1922 | Box 182 \ M21 img030 | |
| Comparison table of the 40/50 model against its competitors. | 19th Sep 1922 | Box 182 \ M21 img031 | |
| Engine heat issues in the front footwells and proposing solutions like insulated foot boxes and isolating the engine chamber. | 19th Sep 1922 | Box 182 \ M21 img032 | |
| Instructions for side door height, floor matting, and footboards for each chassis. | 17th Feb 1922 | Box 182 \ M21 img033 | |
| The dispatch of two Front Wheel Nail Catchers supplied by Messrs. Ferranti Ltd. | 17th Feb 1922 | Box 182 \ M21 img034 | |
| Present chassis design and the number of shutters on car bonnets. | 21th Jul 1924 | Box 182 \ M21 img035 | |
| Performance of wire wheels versus wooden wheels, citing articles, tests, and customer feedback. | 24th Nov 1911 | Box 182 \ M21 img036 | |
| Wire wheels, customer queries, and considerations for cars exported to India. | 24th May 1924 | Box 182 \ M21 img037 | |
| Memo with a diagram proposing a modification for scuttle dash isolation on the 40/50 model. | 24th May 1924 | Box 182 \ M21 img038 | |
| Query regarding deeper rubber washers between the dash and scuttle for the 40/50 & EACII/III chassis. | 9th Feb 1922 | Box 182 \ M21 img039 | |
| Letter from Hollinwood regarding fittings for front-wheel Nail Catchers to be trialled. | 9th Feb 1922 | Box 182 \ M21 img040 | |
| Letter with hand-drawn sketches concerning the correct fitment of carburettor gaskets to prevent vibration issues. | 28th Jun 1928 | Box 182 \ M21 img041 | |
| Short handwritten note to Mr. Johnson regarding a letter from Mr. Bolton. | 12th Jan 1912 | Box 182 \ M21 img042 | |
| Departmental memo concerning the ventilation of a front seat. | 12th Jan 1912 | Box 182 \ M21 img043 | |
| Inquiry to M.S. Napier regarding a patented ventilation system for front seats seen at the Olympia Show. | 9th Jan 1912 | Box 182 \ M21 img044 | |
| Letter from D. Napier & Son clarifying they only supplied the chassis for a car at the Olympia Show, suggesting the bodywork was by Mulliner. | 11th Jan 1912 | Box 182 \ M21 img045 | |
| Departmental memo discussing a report from the Bombay depot about the suitability of wooden versus wire road wheels. | 2nd Sep 1912 | Box 182 \ M21 img046 | |
| Letter from coachbuilder Mulliner regarding a patented dashboard arrangement separating the dashboard from the chassis. | 5th Feb 1912 | Box 182 \ M21 img047 | |
| Proposal to use a flexible strip of leather to connect the bodywork to the dashboard to mitigate movement from the chassis. | 6th Feb 1912 | Box 182 \ M21 img048 | |
| Letter to Messrs Mulliner regarding separate dash boards and Arthur Macdonald's patent. | 6th Feb 1912 | Box 182 \ M21 img049 | |
| Letter requesting patent information for a body and chassis dash arrangement to avoid infringement. | 6th Feb 1912 | Box 182 \ M21 img050 | |
| Letter from S.F. Edge, Limited, providing patent numbers for an insulated body and a spring hinge. | 7th Feb 1912 | Box 182 \ M21 img051 | |
| Request regarding cast aluminium ventilators for the scuttle of London Edinburgh type cars. | 1st Aug 1912 | Box 182 \ M21 img052 | |
| Departmental memo regarding an attached memorandum about Lord Dunraven's car, number 1420. | 25th Oct 1912 | Box 182 \ M21 img053 | |
| Instruction memo discussing the testing and positioning of dash ventilators to prevent warm air entry. | 7th Nov 1912 | Box 182 \ M21 img054 | |
| Rubbing or drawing of a company nameplate. | 8th Feb 1971 | Box 182 \ M21 img055 | |
| Enquiry from a collector in Australia about a maker's plate found on a derelict railway vehicle in Jordan. | 8th Feb 1971 | Box 182 \ M21 img056 | |
| Inquiry requesting information about a vehicle plate, specifically its type and production date. | 23th Jun 1922 | Box 182 \ M21 img057 | |
| Modifications to the frame to accommodate the battery on a Standard 40/50 armoured car. | 23th Jun 1922 | Box 182 \ M21 img058 | |
| Negative impacts of using larger diameter wheels on armoured car chassis. | 8th Oct 1920 | Box 182 \ M21 img059 | |
| Confirmation of a telegram to Mr Basil Johnson regarding a government order and manufacturing strategy. | 12th Oct 1920 | Box 182 \ M21 img060 | |
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