| Description | Date | Identifier | |
| The second page of a letter from Ferodo Limited's Chief Engineer, inviting the recipient to witness a test run. | 10th Jan 1917 | West Wittering \ J \ February1923 Scan56 | |
| Test results for Ferodo bonded asbestos plate clutch linings. | 29th Jan 1923 | West Wittering \ J \ February1923 Scan57 | |
| Testing of miniature Bosch sparking plugs on a Goshawk-11 engine for sooting issues. | 22th Feb 1923 | West Wittering \ J \ February1923 Scan58 | |
| The spare wheel carrier bolt for 20 HP cars working loose and requiring a locking mechanism. | 22th Feb 1923 | West Wittering \ J \ February1923 Scan59 | |
| Discussion with Mr. Royce regarding the necessity and choice of a magneto ignition system for the Goshawk engine. | 23th Feb 1923 | West Wittering \ J \ February1923 Scan60 | |
| Choice of magneto ignition for the 20 HP car, comparing the E.O.6 magneto with a new automatic advance version. | 12th Feb 1923 | West Wittering \ J \ February1923 Scan61 | |
| Performance of a new steering system, focusing on its lack of self-centering. | 1st Jan 1923 | West Wittering \ J \ January1923 Scan0 | |
| Analysis of steering column friction, road shock, and wobbles, comparing a Goshawk-11 with radius rods to standard cars. | 1st Jan 1923 | West Wittering \ J \ January1923 Scan1 | |
| The test results of a 20 HP engine fitted with a large crankshaft, comparing it to the standard engine. | 1st Jan 1923 | West Wittering \ J \ January1923 Scan2 | |
| Comparing the pistons and compression ratios of the Hawk-Northcliffe and 40/50 HP models. | 1st Jan 1923 | West Wittering \ J \ January1923 Scan3 | |
| Experiments on the Goshawk ignition system using dry cell batteries from German Army stores. | 1st Jan 1923 | West Wittering \ J \ January1923 Scan4 | |
| The performance and limitations of dry cell batteries used for engine ignition. | 1st Jan 1923 | West Wittering \ J \ January1923 Scan5 | |
| Cell activation times and the issue of extra weight. | 1st Jan 1923 | West Wittering \ J \ January1923 Scan6 | |
| Electrical test results for a post-war R. Bosch electrical system's dynamo performance. | 3rd Jan 1923 | West Wittering \ J \ January1923 Scan7 | |
| Comparison of ampere output and voltage performance curves for a Bosch dynamo unit under hot and cold conditions. | 18th Jan 1923 | West Wittering \ J \ January1923 Scan8 | |
| Performance characteristics of a dynamo unit showing voltage drops at various speeds and loads with a corresponding graph. | 19th Jan 1923 | West Wittering \ J \ January1923 Scan9 | |
| Trickle charging tests on a battery at various loads and rotational speeds. | 1st Jan 1923 | West Wittering \ J \ January1923 Scan10 | |
| Data tables showing the resultant current on a battery based on amperage load and engine RPM. | 3rd Jan 1923 | West Wittering \ J \ January1923 Scan11 | |
| The performance and experimental work of a dynamo unit, including observed defects and noise levels. | 3rd Jan 1923 | West Wittering \ J \ January1923 Scan12 | |
| Continued report correcting previous findings on the starter motor's solenoid and auxiliary coil operation. | 3rd Jan 1923 | West Wittering \ J \ January1923 Scan13 | |
| Operation and inspection of a starter motor scheme. | 2nd Nov 1925 | West Wittering \ J \ January1923 Scan14 | |
| Graph showing the open circuit volt-speed characteristics for a Post-War R. Bosch Dynamo, with and without regulator control. | 2nd Nov 1925 | West Wittering \ J \ January1923 Scan15 | |
| Problems with the latest spare wheel carrier for the 20 HP chassis and recommending a return to the original design. | 8th Jan 1923 | West Wittering \ J \ January1923 Scan16 | |
| Sales request to conceal bolt heads on the 20 HP radiator shutters. | 4th Feb 1940 | West Wittering \ J \ January1923 Scan17 | |
| Comparison of the 40/50 HP steering system against the Delage steering system. | 10th Jan 1923 | West Wittering \ J \ January1923 Scan18 | |
| Comparison of steering characteristics and road shock transmission between a 40/50 HP model and a Delage car. | 1st Jan 1923 | West Wittering \ J \ January1923 Scan19 | |
| Steering effort tests comparing a 40/50 model with a Delage car under various conditions. | 12th Jan 1925 | West Wittering \ J \ January1923 Scan20 | |
| Tests conducted to understand the cause and period of steering wobbles. | 12th Jan 1925 | West Wittering \ J \ January1923 Scan21 | |
| Various tests conducted to understand the cause and effect of steering 'wobbles'. | 12th Jan 1925 | West Wittering \ J \ January1923 Scan22 | |
| Tests on vehicle 'wobbles', examining the effects of tyre pressure, tyre type, and weight distribution. | 12th Jan 1925 | West Wittering \ J \ January1923 Scan23 | |
| Analysis of chassis and steering wobble, discussing causes, testing methods, and reduction techniques such as adding friction. | 12th Jan 1925 | West Wittering \ J \ January1923 Scan24 | |
| Experiments and conclusions on vehicle steering wobble. | 1st Jan 1923 | West Wittering \ J \ January1923 Scan25 | |
| Requesting suggestions for replacing split pins in gudgeon pin set screws due to them breaking and falling into the crankcase. | 1st Jan 1923 | West Wittering \ J \ January1923 Scan26 | |
| Ignition plug performance, pre-ignition issues, and potential solutions for Goshawk and aero engines. | 19th Jan 1923 | West Wittering \ J \ January1923 Scan27 | |
| From Hs. to R. regarding a delay in completing a car due to noisy gearing on a new starter drive. | 19th Jan 1923 | West Wittering \ J \ January1923 Scan28 | |
| The coefficient of expansion and availability of Monel Metal tubes. | 22th Jan 1923 | West Wittering \ J \ January1923 Scan29 | |
| Letter from G & J. Weir Ltd. regarding the properties and availability of Monel Metal tubes. | 18th Jan 1923 | West Wittering \ J \ January1923 Scan30 | |
| The solid steering nut for the 40/50 model, proposing it for new steering types. | 22th Jan 1923 | West Wittering \ J \ January1923 Scan31 | |
| The Goshawk dynamo's output performance, including experimental curves and comparisons with other machines. | 23th Jan 1923 | West Wittering \ J \ January1923 Scan32 | |
| Experiments to optimise a machine's output, focusing on field winding and control brush positioning, and comparing it to a Bosch dynamo. | 23th Jan 1923 | West Wittering \ J \ January1923 Scan33 | |
| Comparison of specifications and performance characteristics for Bosch and R.R. machines. | 23th Nov 1923 | West Wittering \ J \ January1923 Scan34 | |
| Graph of open-circuit volt-speed curves for the Goshawk dynamo under cold and hot conditions. | 23th Nov 1923 | West Wittering \ J \ January1923 Scan35 | |
| Performance graph comparing the current output curves of Goshawk and Bosch dynamos at various speeds and temperatures. | 11th Jan 1933 | West Wittering \ J \ January1923 Scan36 | |
| Experiments with an improved Goshawk ignition coil, detailing its construction and materials. | 23th Jan 1923 | West Wittering \ J \ January1923 Scan37 | |
| Technical memorandum discussing modifications to a coil, including a new case moulding and reduced primary inductance. | 29th Jan 1923 | West Wittering \ J \ January1923 Scan38 | |
| The failure of Goshawk 11 universal joints due to insufficient lubrication and a proposal for an oil pump. | 29th Jan 1923 | West Wittering \ J \ January1923 Scan39 | |
| Page discussing the weakness of an open propeller shaft requiring hand-lubrication for its joints. | 29th Jan 1923 | West Wittering \ J \ January1923 Scan40 | |
| Testing of a front axle with brakes for the 'Stork' and 'Heron' chassis. | 29th Jan 1923 | West Wittering \ J \ January1923 Scan41 | |
| Clutch slipping in a Bijur starter drive due to suspected oil contamination. | 29th Jan 1923 | West Wittering \ J \ January1923 Scan42 | |
| Steering performance and recommending design changes for the Goshawk 11. | 30th Jan 1923 | West Wittering \ J \ January1923 Scan43 | |
| Machining and comparative strength tests of various insulating materials. | 1st Jan 1923 | West Wittering \ J \ January1923 Scan44 | |
| Comparative loading and high voltage breakdown tests on Stabalite and Beldalite materials. | 30th Jan 1923 | West Wittering \ J \ January1923 Scan45 | |
| The electrical breakdown voltage tests of various insulating materials. | 9th Jan 1923 | West Wittering \ J \ January1923 Scan46 | |
| Analysis of canvas impregnated and fibre core specimens, noting low breakdown voltage results. | 30th Jan 1923 | West Wittering \ J \ January1923 Scan47 | |
| Unauthorized deviation from standard procedure for piston ring stops and demanding an inquiry. | 8th Nov 1923 | West Wittering \ J \ January1923 Scan48 | |
| Drawing No. LeC 1666 for revised driving and damping springs for the Goshawk 11 spring drive. | 8th Jan 1928 | West Wittering \ J \ January1923 Scan49 | |
| The design of the Goshawk ignition coil, awaiting test results for a new larger version before proceeding. | 6th Jan 1923 | West Wittering \ J \ January1923 Scan50 | |
| The supply of open touring and closed bodies for 'Stork' and 'Heron' chassis. | 8th Jan 1923 | West Wittering \ J \ January1923 Scan51 | |
| Arrangement of oil holes and spring pressure for a magneto coupling in response to a criticism. | 9th Mar 1938 | West Wittering \ J \ January1923 Scan52 | |
| Proposal by Mr. Royce for damping the Hawk-Northcliffe & Seagull power unit using flexible arms and friction discs. | 9th Jan 1923 | West Wittering \ J \ January1923 Scan53 | |
| Ignition plug availability and proposing a new auxiliary locked switch design for the 40/50 and Goshawk models. | 10th Jan 1923 | West Wittering \ J \ January1923 Scan54 | |
| Design and effectiveness of radiator louvres for the Goshawk and 40/50 models. | 10th Jan 1923 | West Wittering \ J \ January1923 Scan55 | |
| Potential design modifications to a dynamo, specifically the yoke section and magnetic flux. | 10th Jan 1923 | West Wittering \ J \ January1923 Scan56 | |
| Standardization of straight teeth and ground gears for the Goshawk Gearbox. | 10th Jan 1923 | West Wittering \ J \ January1923 Scan57 | |
| Proposal for a light speed body for use with 'Stork' & 'Heron', detailing door, spare wheel, and battery placement. | 10th Jan 1923 | West Wittering \ J \ January1923 Scan58 | |
| Car's noisy gears, proposing to sell it before the arrival of new 'Stork', 'Heron', and 'Seagull' models. | 10th Jan 1923 | West Wittering \ J \ January1923 Scan59 | |
| Reporting a stuck air valve on a Goshawk carburettor and requesting it be made more free. | 10th Jan 1923 | West Wittering \ J \ January1923 Scan60 | |
| Design of the 'Seagull' cylinder head, valve rocker gear, and compression ratios. | 11th Jan 1928 | West Wittering \ J \ January1923 Scan61 | |
| Specifications for the combustion head, valve push rods, and rocker mechanism. | 12th Jan 1923 | West Wittering \ J \ January1923 Scan62 | |
| Requesting remarks and feedback on the solid steering nut used on the Goshawk 11. | 12th Jan 1923 | West Wittering \ J \ January1923 Scan63 | |
| Inclination of steering pivots and spring tables for 'Stork', 'Heron', and 'Goshawk' models. | 13th Jan 1923 | West Wittering \ J \ January1923 Scan64 | |
| Query requesting specifications and comparative test results for the Delage steering system. | 11th Aug 1920 | West Wittering \ J \ January1923 Scan65 | |
| Cold weather trials and the cause of a broken engine part due to stress fatigue. | 13th Jan 1923 | West Wittering \ J \ January1923 Scan66 | |
| Proposing an 'Arctic chamber' for cold weather testing after a 20 HP chassis cracked. | 1st Jan 1923 | West Wittering \ J \ January1923 Scan67 | |
| Difficulties of fitting various instruments to the instrument board. | 13th Jan 1923 | West Wittering \ J \ January1923 Scan68 | |
| Proposed sports touring body for the 'Stork' and 'Heron' chassis, reference X4113. | 13th Jan 1923 | West Wittering \ J \ January1923 Scan69 | |
| Car body finish, colour specifications, wheel types, and coordination with different coachbuilders. | 13th Jan 1923 | West Wittering \ J \ January1923 Scan70 | |
| Specification for a three-position ignition switch for the 40/50 and 20.HP models. | 13th Jan 1923 | West Wittering \ J \ January1923 Scan71 | |
| Redesign of the 'Seagull' steering box to a worm and worm-wheel system. | 16th Jan 1923 | West Wittering \ J \ January1923 Scan72 | |
| Sending drawing Lec 1670 for a 'Seagull' Spring Drive & Slipper Flywheel and requesting a blueprint. | 16th Jan 1923 | West Wittering \ J \ January1923 Scan73 | |
| Causes of steering wobbles and proposing a test for a potential solution. | 11th Aug 1920 | West Wittering \ J \ January1923 Scan74 | |
| Benefits and implementation of thermostatically controlled louvres on a No.5 Goshawk car. | 16th Jan 1923 | West Wittering \ J \ January1923 Scan75 | |
| Page 2 of a document describing the process for filling, sealing, and testing thermostat units, and preventing water system corrosion. | 11th Aug 1920 | West Wittering \ J \ January1923 Scan76 | |
| Letter from F. H. Royce to Mr. Ricardo discussing the testing of a compound oil in a lighting engine and a 20 HP car. | 16th Jan 1923 | West Wittering \ J \ January1923 Scan77 | |
| Policy for experimental cars, including the 'Heron', 'Seagull', and improvements to the 40/50 model. | 17th Jan 1923 | West Wittering \ J \ January1923 Scan78 | |
| Progression of the 'Heron' and 'Seagull' projects, and the fitting of front wheel brakes to the 40/50 chassis. | 17th Jan 1923 | West Wittering \ J \ January1923 Scan79 | |
| Updates on the design and manufacture of a speed touring body for 'Seagull' or 'Heron' models. | 18th Jan 1923 | West Wittering \ J \ January1923 Scan80 | |
| Modifications to the 'Seagull' valve rocker components and associated drawings. | 19th Jan 1923 | West Wittering \ J \ January1923 Scan81 | |
| Cover note for drawing No. Lec 1671, regarding calculations for the exact lift of a Seagull valve rocker. | 19th Jan 1923 | West Wittering \ J \ January1923 Scan82 | |
| Modified connecting rod for the Goshawk 11 steering column. | 19th Jan 1923 | West Wittering \ J \ January1923 Scan83 | |
| Engine overheating on the 40/50 & Goshawk models, with proposed solutions and a note on corrosion. | 19th Jan 1923 | West Wittering \ J \ January1923 Scan84 | |
| Strategy for modifying the 40/50 model versus abandoning the Heron and developing the Seagull. | 19th Jan 1923 | West Wittering \ J \ January1923 Scan85 | |
| Design of a scraper ring in relation to engine overoiling. | 22th Jan 1923 | West Wittering \ J \ January1923 Scan86 | |
| Difficulties of fitting chassis instruments from the back and recommending alterations. | 19th Jan 1923 | West Wittering \ J \ January1923 Scan87 | |
| Decision to revert to side-position change speed levers for the Goshawk chassis, discontinuing the central change system. | 19th Jan 1923 | West Wittering \ J \ January1923 Scan88 | |
| Ignition plug performance, pre-ignition issues, and potential design improvements. | 19th Jan 1923 | West Wittering \ J \ January1923 Scan89 | |
| Implementation of a double ignition system and a new 3-position switch for Goshawk models. | 19th Jan 1923 | West Wittering \ J \ January1923 Scan90 | |
| Coil case design, coil positioning, and wiring for improved reliability. | 19th Jan 1923 | West Wittering \ J \ January1923 Scan91 | |
| Production engineer's visit discussing body vibrations, booming sounds, and construction materials for the Goshawk chassis. | 19th Jan 1923 | West Wittering \ J \ January1923 Scan92 | |
| Attachment of the dashboard to the scuttle and comparing the design to Daimler's. | 19th Jan 1923 | West Wittering \ J \ January1923 Scan93 | |
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