| Description | Date | Identifier | |
| Arguing for a 3-speed gearbox over a 4-speed gearbox, detailing points for the Directors' meeting. | 23th Nov 1923 | West Wittering \ K \ November1923 Scan124 | |
| Modifications to the spare wheel carrier for the 20HP and 40/50 models. | 23th Nov 1923 | West Wittering \ K \ November1923 Scan125 | |
| Discrepancy between potential and intended torque on front wheel brakes. | 24th Nov 1923 | West Wittering \ K \ November1923 Scan126 | |
| Mr. Royce's recommendation for securing petrol tank stays to allow for frame flexibility. | 24th Nov 1923 | West Wittering \ K \ November1923 Scan127 | |
| Telegram from Royce suggesting an alteration to a floating fulcrum and lever. | 2nd Nov 1925 | West Wittering \ K \ November1923 Scan128 | |
| Suggesting a method to diagnose unnecessary friction in the four-wheel brake mechanism by measuring pull. | 27th Nov 1923 | West Wittering \ K \ November1923 Scan129 | |
| Proposing experimental alterations to the four-wheel brake system. | 27th Nov 1923 | West Wittering \ K \ November1923 Scan130 | |
| Technical memo discussing modifications to the brake shoe design, including 'servo' or jointed shoes. | 11th Aug 1920 | West Wittering \ K \ November1923 Scan131 | |
| Brake testing standards, braking force calculations, and proposed brake shoe designs. | 28th Nov 1923 | West Wittering \ K \ November1923 Scan132 | |
| Steering load and pivot lean on a four-wheel brake chassis following bump tests. | 28th Nov 1923 | West Wittering \ K \ November1923 Scan133 | |
| Front road springs and steering gear, including breakages and flexibility. | 1st Nov 1923 | West Wittering \ K \ November1923 Scan134 | |
| Use of cast iron versus wrought steel for dynamo magnets and the relative cost of laminations. | 30th Nov 1923 | West Wittering \ K \ November1923 Scan135 | |
| Tests to find methods of overcoming torque reaction vibration periods. | 1st Oct 1923 | West Wittering \ K \ October1923 Scan0 | |
| 20 HP engine vibrations, detailing tests and findings related to the use of friction dampers. | 1st Oct 1928 | West Wittering \ K \ October1923 Scan1 | |
| Engine vibration periods and the effectiveness of modifications such as dampers and additional weights. | 12th Jul 1923 | West Wittering \ K \ October1923 Scan2 | |
| Table detailing 12 different engine mounting configurations and their resulting effect on road vibrations. | 12th Jul 1923 | West Wittering \ K \ October1923 Scan3 | |
| Sending someone to complete work on the 5-Goshawk-ll car by fitting friction dampers. | 1st Oct 1923 | West Wittering \ K \ October1923 Scan4 | |
| Outlining engine mounting experiments being conducted on the 20 HP unit. | 1st Oct 1923 | West Wittering \ K \ October1923 Scan5 | |
| Tests on variations of brush bedding in 20 HP Dynamos and the resulting effect on output and heating. | 1st Oct 1923 | West Wittering \ K \ October1923 Scan6 | |
| Machine electrical output based on various brush positions, noting amperage, RPM, and temperature. | 1st Oct 1923 | West Wittering \ K \ October1923 Scan7 | |
| Analysis of dynamo performance and failures, focusing on the effects of brush bedding variation and the design of the 20 HP brush gear. | 1st Oct 1923 | West Wittering \ K \ October1923 Scan8 | |
| The frictional effects and forces affecting the bedding of a brush in its holder and on the commutator. | 1st Oct 1923 | West Wittering \ K \ October1923 Scan9 | |
| Modifying a brush holder by inclining a surface to counteract frictional effects from the commutator. | 1st Oct 1923 | West Wittering \ K \ October1923 Scan10 | |
| Modifications to dynamo brush gear, including slant angle adjustments and overheating issues. | 1st Oct 1923 | West Wittering \ K \ October1923 Scan11 | |
| The selection and testing of fuse wire sizes for a dynamo's field circuit, including test data under cold and hot conditions. | 1st Oct 1923 | West Wittering \ K \ October1923 Scan12 | |
| The design and provisioning of fuses, comparing ready-loaded fuses with spare fuse wire. | 1st Oct 1923 | West Wittering \ K \ October1923 Scan13 | |
| Reducing torque reaction vibration on the 40/50 HP chassis. | 1st Oct 1923 | West Wittering \ K \ October1923 Scan14 | |
| Vibration periods in 40/50 HP cars with different engine suspension setups. | 1st Oct 1923 | West Wittering \ K \ October1923 Scan15 | |
| Suggestion to create a scheme for fitting friction dampers to the 40/50 HP engine mounting. | 1st Oct 1923 | West Wittering \ K \ October1923 Scan16 | |
| Carburettor for an E.A.C. engine. | 1st Oct 1923 | West Wittering \ K \ October1923 Scan17 | |
| The observations of an E.A.C. Carburetter. | 12th Jul 1923 | West Wittering \ K \ October1923 Scan18 | |
| Noise issues and fuel vaporisation within a carburetter. | 2nd Oct 1923 | West Wittering \ K \ October1923 Scan19 | |
| The Goshawk 11 standard indicator diagram, plotting logarithms of absolute pressure and volume. | 12th Jul 1923 | West Wittering \ K \ October1923 Scan20 | |
| Logarithmic pressure-volume indicator diagram showing engine expansion and compression curves. | 1st Oct 1923 | West Wittering \ K \ October1923 Scan21 | |
| Improving low-speed engine power by reducing the camshaft angle from 118° to 110°. | 1st Oct 1923 | West Wittering \ K \ October1923 Scan22 | |
| Camshaft tests for a 20 HP engine. | 31th Oct 1923 | West Wittering \ K \ October1923 Scan23 | |
| Graph showing the percentage increase in BHP over a standard camshaft by using 110° and 108° camshafts. | 21th Sep 1923 | West Wittering \ K \ October1923 Scan24 | |
| Performance graph comparing standard and experimental camshafts for a Goshawk II engine, showing Brake Horsepower (BHP) against Revolutions Per Minute (RPM). | 12th Jul 1923 | West Wittering \ K \ October1923 Scan25 | |
| The E.A.C. engine's condition after 30 hours of running, with notes on adjustments and issues. | 12th Jul 1923 | West Wittering \ K \ October1923 Scan26 | |
| Issues with a countersunk screw, tappet guides, and engine vibration. | 4th Oct 1923 | West Wittering \ K \ October1923 Scan27 | |
| Vibration issue, including a table of horsepower versus revolutions. | 4th Oct 1923 | West Wittering \ K \ October1923 Scan28 | |
| Customer complaints of boiling in 40/50 HP cars when climbing mountain passes. | 1st Oct 1923 | West Wittering \ K \ October1923 Scan29 | |
| Comparing the car cooling systems of various makes with Rolls-Royce models. | 12th Jul 1923 | West Wittering \ K \ October1923 Scan30 | |
| Comparing the matrix dimensions of various car radiators. | 12th Jul 1923 | West Wittering \ K \ October1923 Scan31 | |
| Comparison of the Goshawk 11 and 40/50 HP radiators. | 5th Oct 1923 | West Wittering \ K \ October1923 Scan32 | |
| Comparison table of radiator performance metrics for various cars, ranked by merit. | 5th Oct 1923 | West Wittering \ K \ October1923 Scan33 | |
| Comparison of various car radiators based on litre displacement. | 3rd Oct 1923 | West Wittering \ K \ October1923 Scan34 | |
| Filing system label with printed categories for car models and handwritten/stamped details. | 3rd Oct 1923 | West Wittering \ K \ October1923 Scan35 | |
| The fitting of an improved camshaft to Trials Cars for increased performance. | 1st Oct 1923 | West Wittering \ K \ October1923 Scan36 | |
| Secret internal memo about potential boiling issues with the E.A.C. radiator. | 10th Oct 1923 | West Wittering \ K \ October1923 Scan37 | |
| Comparison of matrix and core surface areas relative to litre displacement. | 1st Oct 1923 | West Wittering \ K \ October1923 Scan38 | |
| Secret report detailing progressive tappet sticking and valve seating issues on an E.A.C. engine. | 1st Oct 1923 | West Wittering \ K \ October1923 Scan39 | |
| Technical assessment of Springfield electrical equipment, including Westinghouse and American Bosch components. | 8th Oct 1923 | West Wittering \ K \ October1923 Scan40 | |
| Fitting a set of front wheel brakes to an axle for a 40/50 chassis to check clearances. | 1st Oct 1923 | West Wittering \ K \ October1923 Scan41 | |
| Measuring frame deflection on a 20 HP frame with a static load. | 10th Oct 1923 | West Wittering \ K \ October1923 Scan42 | |
| Blank, folded sheet of aged paper with punch holes. | 11th Oct 1923 | West Wittering \ K \ October1923 Scan43 | |
| Dispatch of a wooden model for the E.A.C.1 Universal Joint. | 11th Oct 1923 | West Wittering \ K \ October1923 Scan44 | |
| Goshawk-II engine mounting tests, discussing vibration reduction and suspension configurations. | 1st Oct 1923 | West Wittering \ K \ October1923 Scan45 | |
| Test report comparing different engine mounting configurations and their resulting vibrations. | 11th Oct 1923 | West Wittering \ K \ October1923 Scan46 | |
| 10,000-mile test of a 20 HP production chassis, number 79-AO. | 11th Oct 1923 | West Wittering \ K \ October1923 Scan47 | |
| Log of vehicle adjustments and remarks made during a 10,000-mile test. | 11th Oct 1923 | West Wittering \ K \ October1923 Scan48 | |
| Faults and parts replaced during a 10,000 miles test. | 1st Oct 1923 | West Wittering \ K \ October1923 Scan49 | |
| Performance data table for a 20 HP chassis (79-AO) during a 10,000-mile test. | 12th Oct 1923 | West Wittering \ K \ October1923 Scan50 | |
| On experiments proving a Goshawk dynamo fault can be caused by a sticking negative brush. | 12th Oct 1923 | West Wittering \ K \ October1923 Scan51 | |
| Experiment report on the effect of a sticking negative brush on a Goshawk dynamo. | 4th Oct 1923 | West Wittering \ K \ October1923 Scan52 | |
| Test report on the overheating of a Goshawk dynamo, detailing issues with a negative brush and commutator. | 10th Oct 1923 | West Wittering \ K \ October1923 Scan53 | |
| On an E.A.C. engine tappet modification to resolve sticking issues, which destroyed exhaust valves, and a comparison of three carburettors. | 15th Oct 1923 | West Wittering \ K \ October1923 Scan54 | |
| Engine mounting tests for the 2-Goshawk-11 and Marson cars. | 10th Oct 1923 | West Wittering \ K \ October1923 Scan55 | |
| Investigations into the compression diagram of a Goshawk 11 engine. | 17th Oct 1923 | West Wittering \ K \ October1923 Scan56 | |
| G.I. compression diagram chart showing pressure against crank angle. | 17th Oct 1925 | West Wittering \ K \ October1923 Scan57 | |
| Indicator tests performed on a Goshawk-11 engine fitted with a 110° camshaft. | 19th Oct 1923 | West Wittering \ K \ October1923 Scan58 | |
| Petrol consumption, mechanical efficiency, and high piston friction for the Goshawk 11 engine. | 19th Oct 1923 | West Wittering \ K \ October1923 Scan59 | |
| The reliability and efficiency tests conducted on an E.A.C.1 engine. | 19th Oct 1923 | West Wittering \ K \ October1923 Scan60 | |
| The performance and condition of an R.A.E. engine after 148 hours of running. | 19th Oct 1923 | West Wittering \ K \ October1923 Scan61 | |
| Observations during a 32-hour endurance run, focusing on valve failures, valve spring issues, and oil leaks. | 19th Oct 1923 | West Wittering \ K \ October1923 Scan62 | |
| Engine component conditions and issues after an endurance test. | 19th Oct 1923 | West Wittering \ K \ October1923 Scan63 | |
| Oil leak, oil consumption rates, and an issue with the exhaust manifold. | 19th Oct 1923 | West Wittering \ K \ October1923 Scan64 | |
| Wear on the oil pump, distributor drive, and main bearings. | 19th Oct 1923 | West Wittering \ K \ October1923 Scan65 | |
| Summary of test results for Goshawk dynamo brushes made from various materials, comparing them to the standard Le Carbone brushes. | 20th Oct 1923 | West Wittering \ K \ October1923 Scan66 | |
| Road tests on front wheel brakes. | 20th Oct 1923 | West Wittering \ K \ October1923 Scan67 | |
| The effects of backward pivot lean, braking torque, and spring twist on steering performance and wobbles. | 12th Jul 1923 | West Wittering \ K \ October1923 Scan68 | |
| Brake pedal pressure, wrapping action, and the effect of front brakes on steering geometry. | 20th Oct 1923 | West Wittering \ K \ October1923 Scan69 | |
| Front wheel brakes, detailing axle twist under load and the resulting movement. | 12th Jul 1923 | West Wittering \ K \ October1923 Scan70 | |
| Secret memorandum on road test results for front wheel brakes, noting issues with 'jaggers' and torsional effects. | 22th Oct 1923 | West Wittering \ K \ October1923 Scan71 | |
| The comparative tests of Goshawk dynamo brushes in various materials for the 20 HP engine. | 22th Oct 1923 | West Wittering \ K \ October1923 Scan72 | |
| Results of wear tests on Standard 'Z' Le Carbone and ECO Morganite brushes. | 22th Oct 1923 | West Wittering \ K \ October1923 Scan73 | |
| Test report comparing the performance and wear of various types of brushes. | 22th Oct 1923 | West Wittering \ K \ October1923 Scan74 | |
| Performance and wear of various main and control brushes during testing, with a table summarizing the results. | 22th Oct 1923 | West Wittering \ K \ October1923 Scan75 | |
| Report comparing the performance and wear of various types of commutator brushes. | 22th Oct 1923 | West Wittering \ K \ October1923 Scan76 | |
| Proposal and explanation of the E.A.C. semi-earthed chassis electrical system. | 24th Oct 1923 | West Wittering \ K \ October1923 Scan77 | |
| List of points in favour of a suggested electrical system, detailing fuse arrangements and protections. | 24th Oct 1923 | West Wittering \ K \ October1923 Scan78 | |
| The disadvantages of an electrical system, comparing it to the existing Goshawk system. | 24th Oct 1923 | West Wittering \ K \ October1923 Scan79 | |
| Wiring diagram for a semi-earthed electrical system. | 5th Dec 1922 | West Wittering \ K \ October1923 Scan80 | |
| Front wheel brake testing, detailing issues with brake jaggering and attempted modifications. | 12th Jul 1923 | West Wittering \ K \ October1923 Scan81 | |
| The ineffectiveness of 4-wheel brake systems on competitor cars like Isotta and Delage. | 26th Oct 1923 | West Wittering \ K \ October1923 Scan82 | |
| The handling dangers of front-wheel brakes, specifically concerning front-wheel skid during cornering. | 1st Oct 1923 | West Wittering \ K \ October1923 Scan83 | |
| 4-wheel braking systems, skidding, and servo-assisted brakes. | 26th Oct 1923 | West Wittering \ K \ October1923 Scan84 | |
| Road tests on front wheel brakes. | 27th Oct 1923 | West Wittering \ K \ October1923 Scan85 | |
| Braking and steering performance based on different radius rod ball positions. | 12th Jul 1923 | West Wittering \ K \ October1923 Scan86 | |
| The performance differences of a 20 HP engine with various brands of petrol. | 26th Oct 1923 | West Wittering \ K \ October1923 Scan87 | |
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