| Description | Date | Identifier | |
| Laboratory analysis comparing the chemical composition of an American spring and a Woodhead's spring. | 10th Dec 1920 | West Wittering \ G \ August1921 Scan11 | |
| Letter regarding a new 'hot spot' induction pipe design using a butterfly valve to improve heating. | 1st Aug 1921 | West Wittering \ G \ August1921 Scan12 | |
| Letter detailing design improvements for a 40/50 HP rear tank, proposing a new lighter construction and fittings. | 1st Aug 1921 | West Wittering \ G \ August1921 Scan13 | |
| The design and sourcing of 40/50 HP hand-operated louvres. | 1st Aug 1921 | West Wittering \ G \ August1921 Scan14 | |
| The Delco combined lighting and ignition switch, noting potential design flaws and reliability issues. | 1st Aug 1921 | West Wittering \ G \ August1921 Scan15 | |
| Modifications to the 'Goshawk II' flywheel casing. | 1st Aug 1921 | West Wittering \ G \ August1921 Scan16 | |
| The design and drawing Lec.1436 for the 'Goshawk II' dynamo. | 1st Aug 1921 | West Wittering \ G \ August1921 Scan17 | |
| Declining interest in the cold moulded insulation materials Thermoplax and Pyroplax. | 15th Aug 1921 | West Wittering \ G \ August1921 Scan18 | |
| Sending drawings for 'Goshawk' dashboard and footboard brackets. | 1st Aug 1921 | West Wittering \ G \ August1921 Scan19 | |
| Suggestion for a method to expand tubes in the 'Goshawk II' cylinder block, approved by Mr. Royce. | 1st Aug 1921 | West Wittering \ G \ August1921 Scan20 | |
| With a sketch detailing a modification to the Goshawk II cylinder head for oil drainage. | 28th Aug 1921 | West Wittering \ G \ August1921 Scan21 | |
| The dynamo and starter motor for the 'Goshawk II'. | 24th Aug 1921 | West Wittering \ G \ August1921 Scan22 | |
| Requesting an order be placed with the Lucas Company for a dynamo and starter motor for the 'Goshawk II'. | 15th Aug 1921 | West Wittering \ G \ August1921 Scan23 | |
| The chief features of the non-trembler battery ignition system for the 'Goshawk II' engine. | 1st Aug 1921 | West Wittering \ G \ August1921 Scan24 | |
| Special features of an ignition system, including a trailing edge rotor to prevent engine back-firing. | 1st Aug 1921 | West Wittering \ G \ August1921 Scan25 | |
| Performance of different battery makes and proposing continued tests on the Peto & Radford battery. | 30th Aug 1921 | West Wittering \ G \ August1921 Scan26 | |
| Continued list of three desirable characteristics for an electrical storage component. | 1st Aug 1921 | West Wittering \ G \ August1921 Scan27 | |
| Requesting the standardisation of an improved rocker shaft for the 40/50 HP steering box. | 31th Aug 1921 | West Wittering \ G \ August1921 Scan28 | |
| Mr. Royce's decision on approved suppliers for dynamos and motors, cancelling an enquiry with Messrs. Brolt. | 30th Sep 1921 | West Wittering \ G \ August1921 Scan29 | |
| Requesting the standardisation of the X.4373 radiator support bracket. | 5th Sep 1921 | West Wittering \ G \ August1921 Scan30 | |
| Spark test report on the carbonization of Elo and Bakelite materials compared to ebonite. | 4th Aug 1921 | West Wittering \ G \ August1921 Scan31 | |
| Cover memo for an assistant's report on spark test experiments on 'ELO' and 'BAKELITE'. | 5th Aug 1921 | West Wittering \ G \ August1921 Scan32 | |
| Criticisms of the Goshawk 11 engine, specifically addressing a seizing clutch trunnion sleeve during testing. | 1st Aug 1921 | West Wittering \ G \ August1921 Scan33 | |
| Issues found during tests on the spring drive, a retaining bolt, and induction/exhaust pipes. | 1st Aug 1921 | West Wittering \ G \ August1921 Scan34 | |
| Oil pump noise, engine suspension vibrations during testing, and carburettor flow issues. | 1st Mar 1921 | West Wittering \ G \ August1921 Scan35 | |
| Carburetter flooding issues, jet adjustments, lever grip, and the oil level indicator. | 11th Aug 1920 | West Wittering \ G \ August1921 Scan36 | |
| Suggested improvements for oil measurement markings, oil filter accessibility, and flywheel inspection cover design. | 1st Aug 1921 | West Wittering \ G \ August1921 Scan37 | |
| Recommendations for improving cover detachment and standardising plugs in cylinders and gearboxes. | 1st Aug 1921 | West Wittering \ G \ August1921 Scan38 | |
| Outlining criticisms and proposed changes for the 'Goshawk 11' oil pump and valve push rods. | 1st Aug 1921 | West Wittering \ G \ August1921 Scan39 | |
| Fire risk associated with the steering column switch. | 1st Aug 1921 | West Wittering \ G \ August1921 Scan40 | |
| Proposed and inexpensive vent for the 40/50 chassis crankcase. | 1st Aug 1921 | West Wittering \ G \ August1921 Scan41 | |
| Test results for a starter motor on a car with a 3-speed gearbox under cold, warm, and hot conditions. | 11th Aug 1930 | West Wittering \ G \ August1921 Scan42 | |
| Comparative test results for a motor with and without an epicyclic gear, and with varying numbers of brushes. | 11th Aug 1920 | West Wittering \ G \ August1921 Scan43 | |
| Receipt, inspection, and potential use of cold moulded insulation samples named Thermoplax and Pyroplax. | 10th Aug 1921 | West Wittering \ G \ August1921 Scan44 | |
| Continued page of a letter concerning an enquiry to the Igranic Electrical Co. for raw materials. | 10th Aug 1921 | West Wittering \ G \ August1921 Scan45 | |
| Vibration test report for a standard Exide battery, including charge and discharge data. | 12th Aug 1921 | West Wittering \ G \ August1921 Scan46 | |
| Results of a battery vibration test and the subsequent examination of the cells. | 13th Aug 1921 | West Wittering \ G \ August1921 Scan47 | |
| Battery cell failures, comparing the effects of mechanical vibration and incorrect electrical treatment. | 12th Aug 1921 | West Wittering \ G \ August1921 Scan48 | |
| The condition and performance testing of battery cells. | 12th Aug 1921 | West Wittering \ G \ August1921 Scan49 | |
| Battery plate deterioration due to cycles of overcharging and discharge, with plans for further vibration and electrical tests. | 12th Aug 1921 | West Wittering \ G \ August1921 Scan50 | |
| Performance report on two Peto & Radford batteries, No.14 and No.40, detailing their on-road and bench test results. | 12th Aug 1921 | West Wittering \ G \ August1921 Scan51 | |
| Comparison of car batteries, including Peto & Radford and C.A.V-Willard, based on performance, efficiency, and weight. | 12th Aug 1921 | West Wittering \ G \ August1921 Scan52 | |
| Comparison of C.A.V-Willard, U.S.A. Willard, and Exide batteries, discussing weight, capacity, efficiency, and lifespan. | 12th Aug 1921 | West Wittering \ G \ August1921 Scan53 | |
| Bent side steering rod on car 4.EX, concluding the pendulum lever does not need strengthening. | 15th Aug 1921 | West Wittering \ G \ August1921 Scan54 | |
| Experiments and further tests of tungsten contact points. | 16th Aug 1921 | West Wittering \ G \ August1921 Scan55 | |
| Potential causes for roller rusting, suggesting oscillatory discharges and sparking from induced high-frequency oscillations. | 16th Aug 1921 | West Wittering \ G \ August1921 Scan56 | |
| Further tests of two sets of tungsten contact points supplied by the Fansteel Co. | 18th Aug 1921 | West Wittering \ G \ August1921 Scan57 | |
| Results of a 180-hour test on tungsten contacts, noting misfiring, metal transfer, and rust. | 11th Aug 1920 | West Wittering \ G \ August1921 Scan58 | |
| Engineering memo detailing observations and proposed modifications for the Goshawk 11 engine. | 17th Aug 1921 | West Wittering \ G \ August1921 Scan59 | |
| Testing, cost, and potential local sourcing of extruded copper tubes for radiators. | 1st Aug 1921 | West Wittering \ G \ August1921 Scan60 | |
| Letter regarding a list of complaints for the Goshawk 11 engine, detailing issues with parts and recommending changes. | 1st Aug 1921 | West Wittering \ G \ August1921 Scan61 | |
| List of complaints and suggested improvements for various vehicle components. | 11th Feb 1930 | West Wittering \ G \ August1921 Scan62 | |
| List of complaints and requested modifications for various automotive components. | 11th Aug 1930 | West Wittering \ G \ August1921 Scan63 | |
| Recommending the standardisation of a radiator support bracket after successful testing. | 1st Aug 1921 | West Wittering \ G \ August1921 Scan64 | |
| Performance estimate comparing a Goshawk II motor applied to a Goshawk I engine with a different reduction ratio. | 30th Aug 1921 | West Wittering \ G \ August1921 Scan65 | |
| Lubricators, comparing the Benton & Stone system favourably against the Alemite and other schemes. | 21th Jul 1921 | West Wittering \ G \ July1921 Scan0 | |
| Cost reduction and standardization of lubricators for the Goshawk 11 and 40/50 chassis. | 1st Jul 1921 | West Wittering \ G \ July1921 Scan1 | |
| Armature winding specifications for a Rotax AT.12 dynamo. | 12th Jul 1921 | West Wittering \ G \ July1921 Scan3 | |
| Continuation memo cancelling a previous note regarding the winding of a dynamo armature due to an error. | 12th Jul 1921 | West Wittering \ G \ July1921 Scan4 | |
| The provision of spare fuse holders and a comparison between the R.R. and Lucas types. | 15th Jul 1921 | West Wittering \ G \ July1921 Scan6 | |
| Improvement to the fuse holder and clip scheme for customers. | 15th Jul 1921 | West Wittering \ G \ July1921 Scan7 | |
| Comparing the design and quality of ignition and lighting switches from various manufacturers. | 18th Jul 1921 | West Wittering \ G \ July1921 Scan8 | |
| Cancellation of a switch's dimming position for side lamps and requesting the return of a Delco switch. | 18th Jul 1921 | West Wittering \ G \ July1921 Scan9 | |
| Comparing a Bosch switch with Delco and Westinghouse alternatives. | 19th Jul 1921 | West Wittering \ G \ July1921 Scan10 | |
| Starting capabilities of a U.S.A. Bosch Battery Ignition system on a 4.EX Car. | 19th Jul 1921 | West Wittering \ G \ July1921 Scan11 | |
| Modifications to the 40/50 HP chassis hot spot throttle. | 3rd Jul 1921 | West Wittering \ G \ July1921 Scan12 | |
| Letter detailing modifications to a carburettor's float feed and jet to facilitate starting with poor fuel in cold weather. | 1st Jul 1921 | West Wittering \ G \ July1921 Scan13 | |
| Sourcing and production of Bakelite moulds for coil cases. | 1st Jul 1921 | West Wittering \ G \ July1921 Scan14 | |
| Internal memorandum discussing the U.S.A. Bosch Battery Ignition system for the 40/50 chassis. | 6th Jul 1921 | West Wittering \ G \ July1921 Scan15 | |
| Technical discussion on the pros and cons of battery ignition systems and a comparison of ignition timings. | 1st Jul 1921 | West Wittering \ G \ July1921 Scan16 | |
| The testing and performance of a heated induction pipe on the 4.EX car. | 6th Jul 1921 | West Wittering \ G \ July1921 Scan18 | |
| Cable correspondence discussing the implementation of a heated induction pipe and a proposed alternative. | 7th Jul 1921 | West Wittering \ G \ July1921 Scan20 | |
| Replies from the Experimental Department regarding items for the 40/50 Springfield cars for America. | 6th Jul 1921 | West Wittering \ G \ July1921 Scan21 | |
| Drawing Lec.1418 for the 40/50 HP chassis hot spot throttle and starting carburettor. | 7th Jul 1921 | West Wittering \ G \ July1921 Scan23 | |
| Dispatch of drawing Lec.1393 for the 'Buzzard' radiator and suspension to the Derby facility. | 1st Jul 1921 | West Wittering \ G \ July1921 Scan24 | |
| Design revisions for the 'Goshawk II' spare wheel carrier, petrol tank, and filler cap. | 21th Jul 1921 | West Wittering \ G \ July1921 Scan25 | |
| Modifications to the 40/50 HP starter motors. | 14th Jul 1921 | West Wittering \ G \ July1921 Scan26 | |
| Revised designs for the Goshawk II small ball joint for controls. | 14th Jul 1921 | West Wittering \ G \ July1921 Scan27 | |
| Referencing drawings for the 'Goshawk II' starting motor and its field coils. | 1st Jul 1921 | West Wittering \ G \ July1921 Scan28 | |
| Examination and design flaws of a Rotax dynamo. | 19th Jul 1921 | West Wittering \ G \ July1921 Scan29 | |
| The design and performance of the ballast resistance carrier for the 'Goshawk II' battery ignition system. | 21th Jul 1921 | West Wittering \ G \ July1921 Scan30 | |
| Sending drawings Lec.1430/1 for the 'Goshawk II' starter motor brush spring and housing modification. | 6th Sep 1934 | West Wittering \ G \ July1921 Scan31 | |
| The redesigned ignition governor for the Goshawk II engine, referencing drawing Lec.1432. | 4th Aug 1921 | West Wittering \ G \ July1921 Scan32 | |
| Agreeing to Mr. Hives' suggestion to add a fifth groove and ring to pistons on post-war cars. | 22th Jul 1921 | West Wittering \ G \ July1921 Scan33 | |
| Information and drawings for the starting carburettor control on the 40/50 HP chassis. | 4th Aug 1921 | West Wittering \ G \ July1921 Scan34 | |
| The placement of a component between the clock and switch-box for easy driver access. | 1st Jul 1921 | West Wittering \ G \ July1921 Scan35 | |
| Managing chassis alterations and supplying new parts to the Springfield factory. | 1st Jul 1921 | West Wittering \ G \ July1921 Scan36 | |
| Assessment of various vehicle components including thermostats, springs, wiring, and gear systems. | 22th Jul 1921 | West Wittering \ G \ July1921 Scan37 | |
| Recommending the Delco electrical system from a Marmon car for adoption, and comparing it to a Bosch switch. | 1st Jul 1921 | West Wittering \ G \ July1921 Scan38 | |
| The adoption of a Delco switchbox and buzzer, and its implications for the distributing board and fuses. | 1st Jul 1921 | West Wittering \ G \ July1921 Scan39 | |
| Correspondence regarding the design of the Goshawk II bonnet, top radiator support, and dashboard, mentioning drawings and undecided elements. | 1st Jun 1921 | West Wittering \ G \ June1921 Scan0 | |
| The sourcing of high conductivity metal rods for switch contacts and connections. | 1st Jun 1921 | West Wittering \ G \ June1921 Scan1 | |
| Design of the Goshawk II battery ignition, suggesting an ebonite band to prevent carbon tracking on bakelite mouldings. | 4th Jun 1927 | West Wittering \ G \ June1921 Scan2 | |
| Instructions for modifications to a governor tower and rotor assembly for an ignition system. | 1st May 1921 | West Wittering \ G \ June1921 Scan3 | |
| Confirming the decision to suspend all work on the 3rd model (15 HP) Swallow. | 6th Jun 1921 | West Wittering \ G \ June1921 Scan4 | |
| Telegram instructing to standardise dynamo and motor carcase diameters and to cease work on all other sizes. | 7th Jun 1921 | West Wittering \ G \ June1921 Scan5 | |
| U.S.A. customer complaints, attributing issues to low-grade fuel and proposing vehicle modifications. | 8th Jun 1921 | West Wittering \ G \ June1921 Scan7 | |
| Engine performance issues with low-grade fuel, low temperatures in the U.S.A., and potential carburettor and induction system modifications. | 8th Jun 1921 | West Wittering \ G \ June1921 Scan8 | |
| Engine starting issues, fuel quality, carburettor design, and the use of a choker. | 8th Jun 1921 | West Wittering \ G \ June1921 Scan9 | |
| Engine design modifications, starter motors, and transmission knocking caused by leaf springs. | 8th Jun 1921 | West Wittering \ G \ June1921 Scan10 | |
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