| Description | Date | Identifier | |
| Trial run of a new Hispano Suiza car, comparing its engine and brake performance against a 1923 model. | 9th Nov 1923 | West Wittering \ K \ November1923 Scan23 | |
| Road test report on a car's braking, steering, and suspension, recommending the purchase of a second-hand Hispano. | 9th Nov 1923 | West Wittering \ K \ November1923 Scan24 | |
| The violent braking and good turning circle of a Hispano car. | 1st Nov 1923 | West Wittering \ K \ November1923 Scan25 | |
| The braking performance of a 40/50 HP chassis, detailing issues with the front brakes and modifications to the servo system. | 1st Nov 1923 | West Wittering \ K \ November1923 Scan26 | |
| Modifications to the 4-wheel servo brake system to improve braking balance. | 12th Jul 1923 | West Wittering \ K \ November1923 Scan27 | |
| Noting that the car steers to the right upon braking due to an imbalance in the front brakes. | 12th Nov 1923 | West Wittering \ K \ November1923 Scan28 | |
| Failed rear axle pinion on an Isotta Fraschini car during final road tests. | 13th Nov 1923 | West Wittering \ K \ November1923 Scan29 | |
| Comparing the 20 HP Lanchester and 20 HP Sunbeam cars after a recent motor show. | 1st Nov 1923 | West Wittering \ K \ November1923 Scan30 | |
| Comparing the 20 HP Lanchester and 20 HP Sunbeam cars following test drives at a motor show. | 13th Nov 1923 | West Wittering \ K \ November1923 Scan31 | |
| Performance and technical report on the 20 HP Sunbeam Car. | 12th Nov 1923 | West Wittering \ K \ November1923 Scan32 | |
| Continuation of a report with comments on a three-speed gearbox and suspension performance. | 12th Nov 1923 | West Wittering \ K \ November1923 Scan33 | |
| Performance and comparison report on the 20 HP Lanchester car. | 12th Nov 1923 | West Wittering \ K \ November1923 Scan34 | |
| Test report on a demonstration car, evaluating its steering, gearbox, suspension, and brakes. | 13th Nov 1923 | West Wittering \ K \ November1923 Scan35 | |
| Comparative test report on the Goshawk Dynamo Brush Gear. | 13th Nov 1923 | West Wittering \ K \ November1923 Scan36 | |
| Instructions regarding the testing and performance of modified commutator brushes for Goshawk dynamos. | 13th Nov 1923 | West Wittering \ K \ November1923 Scan37 | |
| Instructions detailing observations on commutator brush wear and discolouration after two test runs. | 6th Nov 1918 | West Wittering \ K \ November1923 Scan38 | |
| Test report on a 20 HP rear axle pinion failure following dynamometer testing. | 13th Nov 1923 | West Wittering \ K \ November1923 Scan39 | |
| The investigation on the E.A.C-1 Engine. | 14th Nov 1923 | West Wittering \ K \ November1923 Scan40 | |
| Comparing the thermal efficiencies and heat distribution of an E.A.C-1 engine and a standard 40/50 RR engine. | 12th Jul 1923 | West Wittering \ K \ November1923 Scan41 | |
| Data sheet detailing the heat distribution and thermal efficiency of an E.A.C-1 engine with a Knave carburetter and standard induction system. | 12th Jul 1923 | West Wittering \ K \ November1923 Scan42 | |
| Data tables showing heat distribution expressed as a percentage of heat supplied at different RPMs for two engine models. | 12th Jul 1923 | West Wittering \ K \ November1923 Scan43 | |
| Comparison of efficiencies for the STD 40/50 RR and E.A.C-1 configurations, including data on thermal efficiency and valve timing. | 12th Jul 1923 | West Wittering \ K \ November1923 Scan44 | |
| Energy diagram for a 40-50 engine with a compression ratio of 3.9, plotting energy distribution against RPM. | 14th Nov 1923 | West Wittering \ K \ November1923 Scan45 | |
| Improvements made to the Goshawk dynamos, detailing changes to brushes, springs and the commutator. | 14th Nov 1923 | West Wittering \ K \ November1923 Scan46 | |
| The performance and characteristics of different generator brushes. | 14th Nov 1923 | West Wittering \ K \ November1923 Scan47 | |
| Page 3 of an experimental report discussing improvements in commutation and experiments on noise in dynamos. | 14th Nov 1923 | West Wittering \ K \ November1923 Scan48 | |
| Testing 4-wheel brakes and rectifying 'jagger' issues. | 14th Nov 1923 | West Wittering \ K \ November1923 Scan49 | |
| Use of finer gauge fuses for the field circuit on Goshawk and E.A.C. chassis. | 14th Nov 1923 | West Wittering \ K \ November1923 Scan50 | |
| 30-hour running test on a 20 HP rear axle and proposing an extension to 50 hours. | 14th Nov 1923 | West Wittering \ K \ November1923 Scan51 | |
| Test report on a 20 HP rear axle pinion failure after 34 hours of running at maximum torque. | 15th Nov 1923 | West Wittering \ K \ November1923 Scan52 | |
| Inconsistent 4-wheel braking system, where the epicyclic distribution device was found to be locking up. | 12th Jul 1923 | West Wittering \ K \ November1923 Scan53 | |
| E.A.C-1 engine investigations into the draining boiler and hot-spot. | 16th Nov 1923 | West Wittering \ K \ November1923 Scan54 | |
| The E.A.C-1 induction system and experiments on the hot-spot. | 14th Nov 1923 | West Wittering \ K \ November1923 Scan55 | |
| Engine performance, focusing on fuel distribution and the R.A.C. hot-spot. | 16th Nov 1923 | West Wittering \ K \ November1923 Scan56 | |
| The results of testing different types of hot-spots, including a comparison between cast iron and aluminium. | 12th Jul 1923 | West Wittering \ K \ November1923 Scan57 | |
| Summarizing tests on an aluminium hot spot's efficiency compared to cast iron. | 16th Nov 1923 | West Wittering \ K \ November1923 Scan58 | |
| Reporting the failure of an E.A.C. Pendulum Lever during a bumping test and recommending a design review. | 17th Nov 1923 | West Wittering \ K \ November1923 Scan59 | |
| Results of an investigation into an Exide 6XNS battery for the Goshawk Electrical System. | 20th Nov 1923 | West Wittering \ K \ November1923 Scan60 | |
| Continued memo regarding the return of a battery to the Repair Department and the futility of inspecting its elements. | 20th Nov 1923 | West Wittering \ K \ November1923 Scan61 | |
| Summarizing a test on the Goshawk dynamo brush gear, concluding increased spring pressure leads to excessive wear. | 11th Nov 1923 | West Wittering \ K \ November1923 Scan62 | |
| Test report on Goshawk Z dynamo brushes with increased spring pressure. | 20th Nov 1923 | West Wittering \ K \ November1923 Scan63 | |
| Instruction sheet detailing brush wear and spring pressure measurements. | 6th Nov 1918 | West Wittering \ K \ November1923 Scan64 | |
| Calculations for front wheel brake torque and weight transfer during deceleration. | 22th Nov 1923 | West Wittering \ K \ November1923 Scan65 | |
| Page calculating torque on front wheels and its effect on steering pivots and springs. | 22th Nov 1923 | West Wittering \ K \ November1923 Scan66 | |
| Calculations for the change in weight fraction on the rear wheels of a car during deceleration. | 12th Jul 1923 | West Wittering \ K \ November1923 Scan67 | |
| Two graphs plotting deflection against torque for a single steering pivot. | 23th Nov 1923 | West Wittering \ K \ November1923 Scan68 | |
| Performance issues of the E.A.C. dynamo compared to the Goshawk machine, particularly regarding magnetic reluctance. | 23th Nov 1923 | West Wittering \ K \ November1923 Scan69 | |
| Note about the decision not to issue machine performance curves due to late cutting in. | 23th Nov 1923 | West Wittering \ K \ November1923 Scan70 | |
| Comparison of estimated and observed Goshawk quantities for a shunt machine operating at the cutting-in point. | 23th Nov 1923 | West Wittering \ K \ November1923 Scan71 | |
| Comparison of estimated and observed quantities for an E.A.C. Dynamo operating on the cutting in point as a shunt machine. | 23th Nov 1923 | West Wittering \ K \ November1923 Scan72 | |
| Modifications to floating fulcrum type four-wheel brakes. | 23th Nov 1923 | West Wittering \ K \ November1923 Scan73 | |
| The performance and noise issues of a post-war Bosch dynamo with a combined regulator and cutout. | 23th Nov 1923 | West Wittering \ K \ November1923 Scan74 | |
| The cause of humming and vibration felt on the chassis floorboards. | 23th Nov 1923 | West Wittering \ K \ November1923 Scan75 | |
| Test results comparing the durability of an air hardened steel pinion with a case hardened one for a 20 HP rear axle. | 1st Nov 1923 | West Wittering \ K \ November1923 Scan76 | |
| Tests conducted on the E.A. C-1 Engine. | 26th Nov 1923 | West Wittering \ K \ November1923 Scan77 | |
| The failure of umbrella valves on the E.A. C.1 engine. | 26th Nov 1923 | West Wittering \ K \ November1923 Scan78 | |
| Inadequate valve heat flow and torsional fractures in E.A.C. valve springs. | 26th Nov 1923 | West Wittering \ K \ November1923 Scan79 | |
| Bump tests conducted on a 40/50 chassis equipped with 4-wheel brakes. | 26th Nov 1923 | West Wittering \ K \ November1923 Scan80 | |
| Log from a bump test on a 40/50 HP model, detailing component failures and replacements over time. | 26th Nov 1923 | West Wittering \ K \ November1923 Scan81 | |
| Log of component failures, detailing running times, piece numbers, and particulars of the breakages. | 26th Nov 1923 | West Wittering \ K \ November1923 Scan82 | |
| Requesting feedback on a luggage grid fitted to car 5-G-11, noting concerns about the back rail fixing. | 27th Nov 1923 | West Wittering \ K \ November1923 Scan83 | |
| The particulars of brakes on a Hispano car. | 29th Nov 1923 | West Wittering \ K \ November1923 Scan84 | |
| Graphs plotting axle movement against load for a Hispano axle in two different positions. | 29th Nov 1923 | West Wittering \ K \ November1923 Scan85 | |
| Schematic diagram of the Hispano front wheel brake linkage. | 29th Nov 1923 | West Wittering \ K \ November1923 Scan86 | |
| Technical drawing of the Hispano rear brake operation mechanism. | 29th Nov 1923 | West Wittering \ K \ November1923 Scan87 | |
| Dimensioned drawing of a Hispano brake shoe. | 25th Jun 1927 | West Wittering \ K \ November1923 Scan88 | |
| Design drawing for a silent front drum brake assembly. | 25th Jun 1927 | West Wittering \ K \ November1923 Scan89 | |
| Testing front brakes with a floating fulcrum following alterations. | 29th Nov 1923 | West Wittering \ K \ November1923 Scan90 | |
| Internal secret memo detailing verbal instructions from Mr. Royce for modifications to the 40/50 car's braking system. | 5th Nov 1923 | West Wittering \ K \ November1923 Scan91 | |
| Proposal for modifications to front brakes, including new shoe designs, servos, and patented schemes for relieving brakes when cornering. | 6th Nov 1923 | West Wittering \ K \ November1923 Scan92 | |
| Letter discussing modifications to brake and axle designs, referencing the Goshawk and 40/50 models. | 6th Nov 1923 | West Wittering \ K \ November1923 Scan93 | |
| Progress report on brake systems, servos, and the state of design for four-wheel brake chassis modifications. | 6th Nov 1923 | West Wittering \ K \ November1923 Scan94 | |
| Status report table for various automotive components across different experimental chassis codes (EAC). | 6th Nov 1923 | West Wittering \ K \ November1923 Scan95 | |
| Status table tracking modifications and parts for models EAC.111, EAC.11, and EAC.1. | 1st Nov 1923 | West Wittering \ K \ November1923 Scan96 | |
| Coachwork modifications required for converting 40/50 and Goshawk models to a four-wheel brake system. | 1st Nov 1923 | West Wittering \ K \ November1923 Scan97 | |
| Three proposed improvements to strengthen the Goshawk bevel pinion following a breakage. | 12th Nov 1923 | West Wittering \ K \ November1923 Scan99 | |
| Historical and proposed design improvements for coils, focusing on casing materials and manufacturing processes. | 12th Nov 1923 | West Wittering \ K \ November1923 Scan100 | |
| Wiring schemes, arguing for a complete earth system for the 40/50 Goshawk model. | 1st Nov 1923 | West Wittering \ K \ November1923 Scan101 | |
| Development of the Goshawk Dynamo, with suggestions on brush materials and design improvements. | 12th Nov 1923 | West Wittering \ K \ November1923 Scan102 | |
| Difficulties of developing an automatic release for front wheel brakes for use when cornering. | 12th Nov 1923 | West Wittering \ K \ November1923 Scan103 | |
| Wear issues and proposed design changes for the Goshawk oil pump. | 11th Dec 1923 | West Wittering \ K \ November1923 Scan104 | |
| Requesting car weight and road friction data for a Hispano-Suiza to analyze pedal pressures. | 13th Nov 1923 | West Wittering \ K \ November1923 Scan105 | |
| Confirmation of a telegram from Royce to Rowledge & Hives regarding testing for brake or control issues. | 14th Nov 1923 | West Wittering \ K \ November1923 Scan106 | |
| Telegram from Royce suggesting modifications to a drum and lapping shoes to address 'jaggers'. | 15th Nov 1923 | West Wittering \ K \ November1923 Scan107 | |
| Two telegrams sent regarding issues and solutions for 'jaggering' four-wheel brakes. | 11th Nov 1923 | West Wittering \ K \ November1923 Scan108 | |
| List of points discussing improvements and design considerations for a vehicle's braking and suspension system. | 12th Jul 1923 | West Wittering \ K \ November1923 Scan109 | |
| The need for a new brake shoe scheme to compensate for front axle flexibility and maintain reputation. | 17th Nov 1923 | West Wittering \ K \ November1923 Scan110 | |
| Stating the decision to not use fine fuses because they are too delicate and prone to failure. | 17th Nov 1923 | West Wittering \ K \ November1923 Scan111 | |
| Requesting improvements to be made to the 20.HP rear axle. | 17th Nov 1923 | West Wittering \ K \ November1923 Scan112 | |
| Average pedal pressure exerted during maximum braking, comparing estimates with data from Isotta. | 17th Nov 1923 | West Wittering \ K \ November1923 Scan113 | |
| Questioning why improvements from the 6.EX model are not being fitted to the present 40/50 car. | 21th Nov 1923 | West Wittering \ K \ November1923 Scan114 | |
| Recommendation to improve cold weather performance on a 40/50 chassis by fitting radiator louvres and cancelling the thermostat. | 21th Nov 1923 | West Wittering \ K \ November1923 Scan115 | |
| Brake system defects, spring stiffness issues, and a new front axle control scheme. | 21th Nov 1923 | West Wittering \ K \ November1923 Scan116 | |
| Comparing a Hispano car to their own, noting its pros and cons as a competitor. | 21th Nov 1923 | West Wittering \ K \ November1923 Scan117 | |
| Required modifications to the Goshawk 11 chassis to improve rigidity and create more body space. | 21th Nov 1923 | West Wittering \ K \ November1923 Scan118 | |
| Proposed modifications for a four-wheel brake system on a 40/50 model. | 22th Nov 1923 | West Wittering \ K \ November1923 Scan119 | |
| The underframe and stiffeners for an experimental landaulette body on chassis No. 668. | 22th Nov 1923 | West Wittering \ K \ November1923 Scan120 | |
| Modifications to the pressure distributing gear for 40/50 four-wheel brakes. | 22th Nov 1923 | West Wittering \ K \ November1923 Scan121 | |
| Engine speed as the cause of broken induction pipes and suggesting aluminium pistons for cars with piston ring issues. | 22th Nov 1923 | West Wittering \ K \ November1923 Scan122 | |
| Conditions for proceeding with a 4-speed gearbox design, while arguing against its necessity and criticizing the Sales department. | 23th Nov 1923 | West Wittering \ K \ November1923 Scan123 | |
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