| Description | Date | Identifier | |
| Comparative tests with different grades of petrol to determine difference in 'loading up' at low speed. | 25th Oct 1923 | West Wittering \ K \ October1923 Scan88 | |
| Performance comparison of 20 HP cars using various brands of petrol, detailing hill climb and level speed test results. | 1st Oct 1923 | West Wittering \ K \ October1923 Scan89 | |
| The standardisation of torque reaction vibration dampers for 40/50 HP and 20 HP models. | 27th Oct 1923 | West Wittering \ K \ October1923 Scan90 | |
| The E.A. C.1 engine, detailing fuel distribution issues and camshaft comparisons. | 29th Oct 1923 | West Wittering \ K \ October1923 Scan91 | |
| Graph showing power output and consumption for an engine with a KNAVE carburettor, including a valve timing diagram and test conditions. | 24th Oct 1923 | West Wittering \ K \ October1923 Scan92 | |
| Proposed semi-earthed electrical system for Goshawk units. | 29th Oct 1923 | West Wittering \ K \ October1923 Scan93 | |
| Wiring diagram of a vehicle's electrical system featuring a dynamo, switchbox, ammeter, battery, and various lamps. | 28th Oct 1924 | West Wittering \ K \ October1923 Scan94 | |
| Capacity-temperature tests of 20 HP battery ignition condensers. | 29th Oct 1923 | West Wittering \ K \ October1923 Scan95 | |
| Report page detailing the testing of condenser capacity and leakage at various temperatures. | 29th Oct 1923 | West Wittering \ K \ October1923 Scan96 | |
| Temperature testing procedures and observations for different groups of condensers. | 29th Oct 1923 | West Wittering \ K \ October1923 Scan97 | |
| Performance and stability tests of various condensers under different conditions. | 29th Oct 1923 | West Wittering \ K \ October1923 Scan98 | |
| The performance and temperature-related capacity variations of various condensers. | 29th Oct 1923 | West Wittering \ K \ October1923 Scan99 | |
| Analysis of condenser temperature-capacity curves under varying thermal conditions. | 29th Oct 1923 | West Wittering \ K \ October1923 Scan100 | |
| Technical analysis of condenser capacity changes due to temperature cycles. | 29th Oct 1923 | West Wittering \ K \ October1923 Scan101 | |
| Production difficulties and testing of condenser capacities, leakage, and temperature variation. | 29th Oct 1923 | West Wittering \ K \ October1923 Scan102 | |
| Graph showing the variation of capacity with temperature for paper condensers. | 29th Oct 1923 | West Wittering \ K \ October1923 Scan103 | |
| Graph showing the variation of capacity with temperature for different paper condensers. | 29th Oct 1923 | West Wittering \ K \ October1923 Scan104 | |
| Graph showing the variation of capacity with temperature for different paper condensers. | 29th Oct 1923 | West Wittering \ K \ October1923 Scan105 | |
| Graph showing the variation of capacity with temperature for different types of paper condensers. | 12th Jul 1923 | West Wittering \ K \ October1923 Scan106 | |
| The lubrication of the universal joint at the back of the gearbox. | 12th Jul 1923 | West Wittering \ K \ October1923 Scan107 | |
| Joint lubrication, comparing oil versus grease and considering conditions for American customers. | 30th Oct 1923 | West Wittering \ K \ October1923 Scan108 | |
| Chassis load distribution for experiments on Goshawk tie-bars. | 1st Oct 1923 | West Wittering \ K \ October1923 Scan109 | |
| Confirmation of a telegram regarding the revision of commutator LeC.1735. | 2nd Oct 1923 | West Wittering \ K \ October1923 Scan110 | |
| Engine mounting experiments, including a new two-arm mounting scheme and damper placement. | 3rd Oct 1923 | West Wittering \ K \ October1923 Scan111 | |
| Engine vibration reduction through a trussed or stiffened frame and alternative engine mounting. | 3rd Oct 1923 | West Wittering \ K \ October1923 Scan112 | |
| Memo discussing engine vibrations, potential improvements with trussed frames, and travel arrangements. | 3rd Oct 1923 | West Wittering \ K \ October1923 Scan113 | |
| Secret memo from 'R' suggesting engine testing procedures and preparations for chassis fitting. | 3rd Oct 1923 | West Wittering \ K \ October1923 Scan114 | |
| Memo discussing the BAC engine, its testing, and installation on a chassis. | 3rd Oct 1923 | West Wittering \ K \ October1923 Scan115 | |
| Engine vibration issues, proposed frame improvements, and logistical arrangements for car transport. | 3rd Oct 1923 | West Wittering \ K \ October1923 Scan116 | |
| Body rattles and frame stiffness, detailing defects found in Goshawk body brackets on 40/50 and Goshawk frames. | 12th Oct 1923 | West Wittering \ K \ October1923 Scan117 | |
| Technical report discussing solutions for frame twisting and body rattles by proposing revised brackets and additional cross members. | 12th Oct 1923 | West Wittering \ K \ October1923 Scan118 | |
| The design of sheet metal body stiffeners, cross members, and body brackets. | 1st Oct 1923 | West Wittering \ K \ October1923 Scan119 | |
| Unexpected deflection curves in Goshawk tie-bars and requesting further testing. | 10th Dec 1923 | West Wittering \ K \ October1923 Scan120 | |
| Secret internal memo detailing the decision to retain double brakes and adopt a semi-servo system for new gearboxes. | 13th Oct 1923 | West Wittering \ K \ October1923 Scan121 | |
| Development of an in-house dipping headlight mechanism for the 20 HP model. | 13th Oct 1923 | West Wittering \ K \ October1923 Scan122 | |
| Secret memo regarding two gear ratios needed for the E.A.C. back axle. | 13th Oct 1923 | West Wittering \ K \ October1923 Scan123 | |
| Design schemes for E. A. C. ignition wiring and 40/50 chassis modifications for torque reaction dampers and front wheel brakes. | 13th Oct 1923 | West Wittering \ K \ October1923 Scan124 | |
| Modifications to the Goshawk frame, including new brackets, improved cross members, and trussing. | 13th Oct 1923 | West Wittering \ K \ October1923 Scan125 | |
| Modifications to the EAC gearbox, engine support, and valve tappets. | 1st Oct 1923 | West Wittering \ K \ October1923 Scan126 | |
| Secret memo detailing the specifications for the windings of the X.9620 starter motor. | 1st Oct 1923 | West Wittering \ K \ October1923 Scan127 | |
| Comparing the engine mounting and performance of a Marmon chassis with the Goshawk model. | 16th Oct 1923 | West Wittering \ K \ October1923 Scan128 | |
| Objections and improvements to a scheme for fitting a magneto to a 20 HP car. | 16th Oct 1923 | West Wittering \ K \ October1923 Scan129 | |
| Examination of a wooden model for universal joints and potential modifications. | 16th Oct 1923 | West Wittering \ K \ October1923 Scan130 | |
| Gearbox design for the Goshawk model to accommodate side levers and four-wheel brakes. | 16th Oct 1923 | West Wittering \ K \ October1923 Scan131 | |
| Confirming Mr. Royce's agreement to adopt a one-piece forging for the fan drive pivot and spindle. | 16th Oct 1923 | West Wittering \ K \ October1923 Scan132 | |
| Technical memorandum discussing the stress calculations for bolts with forced-on collars. | 1st Oct 1923 | West Wittering \ K \ October1923 Scan133 | |
| The design for accessibility and maintenance of the E.A.C. and Goshawk engines. | 17th Oct 1923 | West Wittering \ K \ October1923 Scan134 | |
| Proposed design changes to the back axle, gearbox, and engine. | 17th Oct 1923 | West Wittering \ K \ October1923 Scan135 | |
| Proposing an automatic ignition advance mechanism using a governor and hydraulic pressure. | 18th Oct 1923 | West Wittering \ K \ October1923 Scan136 | |
| Very poor assessment of a competitor's Isotta-Fraschini car, listing numerous faults. | 18th Oct 1923 | West Wittering \ K \ October1923 Scan137 | |
| Proposing an automatic, governor-controlled ignition advance mechanism. | 18th Oct 1923 | West Wittering \ K \ October1923 Scan138 | |
| Memo regarding chassis modifications, parts finishing and delivery schedule for an Allweather car. | 18th Oct 1923 | West Wittering \ K \ October1923 Scan139 | |
| Secret memo detailing chassis modifications to fit a new engine, including lengthening front springs and repositioning the radiator. | 19th Oct 1923 | West Wittering \ K \ October1923 Scan140 | |
| Modifications to fan draught, matrix size, and front spring stiffness due to front-wheel brakes. | 19th Oct 1923 | West Wittering \ K \ October1923 Scan141 | |
| Suggestion to standardise experiments on body parts related to the chassis, involving coachbuilders in the process. | 19th Oct 1923 | West Wittering \ K \ October1923 Scan142 | |
| Proposed improvements to Goshawk II body brackets, requesting a trial of the new design. | 22th Oct 1923 | West Wittering \ K \ October1923 Scan143 | |
| Telegram from Royce rejecting a suggestion for a forward running brake and providing alternative instructions for a pull lever system. | 22th Oct 1925 | West Wittering \ K \ October1923 Scan144 | |
| Telegram regarding suggestions for cancelling bodies and a method for applying brakes. | 22th Oct 1923 | West Wittering \ K \ October1923 Scan145 | |
| Telegram received by telephone with handwritten instructions about pulleys, levers and rods. | 23th May 1923 | West Wittering \ K \ October1923 Scan146 | |
| Telegram received by telephone with instructions to modify a suspension spring system. | 23th May 1923 | West Wittering \ K \ October1923 Scan147 | |
| Telegram message received by telephone regarding the positioning of vertical axle rods. | 23th May 1923 | West Wittering \ K \ October1923 Scan148 | |
| Responding to a report on front wheel brakes and outlining policy adjustments. | 23th Oct 1923 | West Wittering \ K \ October1923 Scan149 | |
| Revised scheme for 20 HP body stiffeners, including design modifications and coordination with coachbuilders. | 10th Oct 1923 | West Wittering \ K \ October1923 Scan150 | |
| Technical memorandum discussing issues and proposed solutions for front wheel brake judder, known as 'jaggers'. | 23th Oct 1923 | West Wittering \ K \ October1923 Scan151 | |
| Improvements and issues with brake systems and steering wobble. | 11th Aug 1920 | West Wittering \ K \ October1923 Scan152 | |
| Confirmation of a telegram detailing instructions to fix issues described as 'Jaggers' and 'Wobbles'. | 24th Oct 1923 | West Wittering \ K \ October1923 Scan153 | |
| Design of front wheel brakes, including the use of radius rods and shock dampers. | 1st Oct 1923 | West Wittering \ K \ October1923 Scan154 | |
| Damping, the use of aluminium for brake drums, and the effects of front brakes on steering. | 24th Oct 1923 | West Wittering \ K \ October1923 Scan155 | |
| American alterations, including consent from Mr. Royce for a simplified method of locking a screwed bush in the gearbox. | 24th Oct 1923 | West Wittering \ K \ October1923 Scan156 | |
| Modified wiring scheme for the Goshawk 11 standby ignition. | 25th Oct 1923 | West Wittering \ K \ October1923 Scan157 | |
| Telegram from Royce regarding a proposal by Bailey to modify a brake servo by splitting the bronze outer sphere. | 26th Oct 1923 | West Wittering \ K \ October1923 Scan158 | |
| Telegram confirming proposed modifications and tests for the brake servo system. | 26th Oct 1923 | West Wittering \ K \ October1923 Scan159 | |
| From DA to HS regarding the inspection and potential purchase of a Hispano car for testing. | 29th Oct 1923 | West Wittering \ K \ October1923 Scan160 | |
| Questioning the Sales Conference's decision to drop the idea of luminous instrument dials and asking to continue experimental work. | 30th Oct 1923 | West Wittering \ K \ October1923 Scan161 | |
| The noise and power effects of a swan neck connection on a rear silencer. | 1st Sep 1923 | West Wittering \ K \ September1923 Scan0 | |
| The expansion of Goshawk 11 exhaust valves to determine required tappet clearance. | 1st Sep 1923 | West Wittering \ K \ September1923 Scan1 | |
| The expansion characteristics and performance of different engine valve types. | 12th Jul 1923 | West Wittering \ K \ September1923 Scan2 | |
| Recommendation to modify the valve design to 45° angle seats and to send samples for review. | 1st Sep 1923 | West Wittering \ K \ September1923 Scan3 | |
| Blank page with punch holes. | 14th Sep 1923 | West Wittering \ K \ September1923 Scan4 | |
| Comparing the sparking performance of ignition coils in cases made from various materials. | 3rd Sep 1923 | West Wittering \ K \ September1923 Scan5 | |
| Temperature tests performed on ignition coils housed in cases made of different materials. | 1st Sep 1923 | West Wittering \ K \ September1923 Scan6 | |
| Test report on a coil connected to six graduated spark gaps, measuring performance over time. | 21th Sep 1923 | West Wittering \ K \ September1923 Scan7 | |
| Test report on the maximum regular sparking gap of different coil types during a heating-up process. | 28th Sep 1923 | West Wittering \ K \ September1923 Scan8 | |
| The temperatures of the dynamo, ignition coil, and condenser, measured using temperature-indicating sentinels. | 4th Sep 1923 | West Wittering \ K \ September1923 Scan9 | |
| The Coshawk Bendix Drive, comparing its performance with the Bijur drive on a Trials Car and a 20 HP production car. | 1st Sep 1923 | West Wittering \ K \ September1923 Scan10 | |
| Comparing the performance of a Bijur clutch with a cork washer clutch under various conditions. | 12th Jul 1923 | West Wittering \ K \ September1923 Scan11 | |
| Receipt and experimental testing of P & R batteries for the Goshawk car. | 5th Sep 1923 | West Wittering \ K \ September1923 Scan12 | |
| Order for six-compartment moulded cell cases from Messrs. Peto & Radford for the 40HII model. | 1st Sep 1923 | West Wittering \ K \ September1923 Scan13 | |
| The comparison of different engine oils for power and consumption. | 1st Sep 1923 | West Wittering \ K \ September1923 Scan14 | |
| Graphs comparing the performance of different oils in a 6-cylinder Eagle engine, showing power curves, oil consumption, and oil pressures. | 6th Sep 1923 | West Wittering \ K \ September1923 Scan15 | |
| Methods to prevent water loss from the radiator due to boiling. | 6th Sep 1923 | West Wittering \ K \ September1923 Scan16 | |
| Tests conducted to prevent water loss from the radiator due to boiling. | 12th Jul 1923 | West Wittering \ K \ September1923 Scan17 | |
| Radiator modifications to measure and reduce steam and water loss. | 12th Jul 1923 | West Wittering \ K \ September1923 Scan18 | |
| Test report detailing the results of radiator overflow tests under various conditions. | 12th Jul 1923 | West Wittering \ K \ September1923 Scan19 | |
| Table of test results logging water loss from a cooling system under various conditions. | 6th Sep 1923 | West Wittering \ K \ September1923 Scan20 | |
| Heat losses to the jacket water of a 40/50 engine, and the factors influencing them. | 6th Sep 1923 | West Wittering \ K \ September1923 Scan21 | |
| For Test 6, comparing clean and carbonised engines by measuring heat loss to the jacket water. | 6th Sep 1923 | West Wittering \ K \ September1923 Scan22 | |
| Engine heat flow, summarising test results for minimising loss through cooling water. | 12th Jul 1923 | West Wittering \ K \ September1923 Scan23 | |
| Test results for a 40/50 HP test engine, showing thermal efficiency, power, and heat balance under high compression. | 12th Jul 1923 | West Wittering \ K \ September1923 Scan24 | |
| Table showing heat distribution as a percentage of initial heat supply at various engine RPMs. | 12th Jul 1923 | West Wittering \ K \ September1923 Scan25 | |
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