| Description | Date | Identifier | |
| Log sheet detailing a battery's second charge cycle, weight, and performance test results. | 22th Nov 1923 | Box 48 \ 3 Scan322 | |
| Test report detailing battery cell densities and charge characteristics. | 22th Nov 1923 | Box 48 \ 3 Scan323 | |
| Report page on the fifth charge equivalent, detailing current, hours, and ampere-hours, with a note on measurement difficulties. | 18th Jan 1924 | Box 48 \ 3 Scan324 | |
| Performance and testing status of various car batteries. | 18th Jan 1924 | Box 48 \ 3 Scan325 | |
| The unsuitability and failure of a 'Fors' battery from Messrs. Calender during testing. | 8th Feb 1924 | Box 48 \ 3 Scan326 | |
| Service and performance log for battery number 108. | 13th Feb 1924 | Box 48 \ 3 Scan327 | |
| The return of a 'FORS' Battery to its makers (Callender) and the cessation of further tests. | 11th Feb 1924 | Box 48 \ 3 Scan328 | |
| Returning a 'Fors' battery, noting it is filled with water for transit purposes. | 2nd Feb 1924 | Box 48 \ 3 Scan329 | |
| To Mr. Clarke regarding the dispatch of a battery to the Erith Battery Company. | 14th Feb 1924 | Box 48 \ 3 Scan330 | |
| Letter from an engineering merchant regarding a failed accumulator and a request for it to be returned for investigation. | 13th Feb 1924 | Box 48 \ 3 Scan331 | |
| Report on the X.4218 Fors Battery for the Erith Battery Co. | 19th Feb 1924 | Box 48 \ 3 Scan332 | |
| Test report on the capacity and performance of a Fors battery. | 19th Feb 1924 | Box 48 \ 3 Scan333 | |
| Experimental use and failure of a battery, deeming it unsuitable for its purpose. | 28th Aug 1923 | Box 48 \ 3 Scan334 | |
| Summary notes on a Fors Type 12-3404 12-volt battery. | 28th Aug 1923 | Box 48 \ 3 Scan335 | |
| Instructions regarding the grouping and connection of battery cells and terminals. | 5th Dec 1922 | Box 48 \ 3 Scan336 | |
| Instructions detailing the design of vents and elements for a component. | 5th Dec 1922 | Box 48 \ 3 Scan337 | |
| Instructions detailing the construction and mounting of a vehicle battery. | 5th Dec 1922 | Box 48 \ 3 Scan338 | |
| Graph plotting electrical measurements including amperes, ampere-hours, and ohms for a circuit test. | 22th Nov 1923 | Box 48 \ 3 Scan339 | |
| Graph plotting electrical test results over time with calculated values. | 30th Nov 1923 | Box 48 \ 3 Scan340 | |
| With instructions regarding the carburetter, petrol feed, and induction pipe for the Goshawk chassis. | 10th Feb 1920 | Box 48 \ 4 Scan001 | |
| Various schemes for fitting induction pipes to the Goshawk engine. | 16th Sep 1920 | Box 48 \ 4 Scan002 | |
| Enclosing two blueprints for scheme 574, showing an arrangement of the Goshawk carburetter and induction pipe. | 25th Oct 1920 | Box 48 \ 4 Scan003 | |
| Drawing LeC 1327 for the carburetter and induction pipe flanges of the 'Kite' engine. | 19th Feb 1920 | Box 48 \ 4 Scan004 | |
| The distribution of two blueprints for the 'KITE' chassis. | 3rd Jan 1921 | Box 48 \ 4 Scan005 | |
| Extract detailing design updates for the Goshawk II engine, including the detachable head, induction pipe, and auxiliary drives. | 18th Jan 1921 | Box 48 \ 4 Scan006 | |
| Drawing Lec.1333 for the Goshawk 11 - 3/21 Gear Box and its assembly. | 2nd Feb 1921 | Box 48 \ 4 Scan007 | |
| Suggested assembly order for the 3/21 Goshawk 11 gearbox. | 31th Jan 1921 | Box 48 \ 4 Scan008 | |
| Numbered list of assembly instructions, page 2, for a mechanical component. | 31th Jan 1921 | Box 48 \ 4 Scan009 | |
| Modifications to the Goshawk 11 induction and exhaust pipes. | 27th Sep 1921 | Box 48 \ 4 Scan010 | |
| Considerable trouble with porous induction and exhaust pipes on the Goshawk 11. | 27th Sep 1921 | Box 48 \ 4 Scan011 | |
| Blueprints for Goshawk 11 cylinder inlet pipes and part replacements. | 30th Sep 1921 | Box 48 \ 4 Scan012 | |
| Investigation into a roaring noise from the Goshawk 11 induction system. | 10th Oct 1921 | Box 48 \ 4 Scan013 | |
| Modified induction pipe design for the Goshawk 11 engine to solve hot spot issues. | 6th Oct 1931 | Box 48 \ 4 Scan014 | |
| Telegram discussing the reduction of Goshawk engine roar. | 13th Oct 1932 | Box 48 \ 4 Scan015 | |
| Two design schemes for overcoming a hot spot issue on the Goshawk 11 induction pipe. | 10th Oct 1921 | Box 48 \ 4 Scan016 | |
| Telegram confirmation regarding reducing engine roar on the Goshawk model by fitting a silencer. | 7th Oct 1921 | Box 48 \ 4 Scan017 | |
| Investigation into the cause of a roar in the Goshawk 11 induction system by comparing it with the Goshawk 1. | 10th Oct 1921 | Box 48 \ 4 Scan018 | |
| Confirmation of a telegram regarding a testing suggestion for a double port alteration. | 12th Oct 1921 | Box 48 \ 4 Scan019 | |
| Investigation into the cause of 'Induction Roar' and tests to reduce it by altering valve design. | 13th Oct 1921 | Box 48 \ 4 Scan020 | |
| Altering the shape of the double inlet and exhaust ports on the Goshawk 11 cylinder head to reduce noise. | 13th Oct 1921 | Box 48 \ 4 Scan021 | |
| Goshawk engine induction roar and starter motor pinion issues. | 14th Oct 1921 | Box 48 \ 4 Scan022 | |
| Confirmation of a telegram from Royce to Hives regarding a meeting and a comparison of the Goshawk and Marmon. | 1st Nov 1921 | Box 48 \ 4 Scan023 | |
| Confirmation of a telegram telephoned to Chichester regarding engine and chassis modifications. | 3rd Nov 1921 | Box 48 \ 4 Scan024 | |
| Reducing engine roar on the Goshawk and a broken supporting tube. | 4th Nov 1921 | Box 48 \ 4 Scan025 | |
| Confirmation of a telegram regarding engine roar and suggested exhaust modifications. | 4th Nov 1921 | Box 48 \ 4 Scan026 | |
| Modifications to the Goshawk 11 induction and exhaust pipe. | 19th Nov 1921 | Box 48 \ 4 Scan027 | |
| Requesting comparative testing of induction pipes for Goshawk 11 and Neptune engines using a paraffin fuel mix. | 15th Dec 1921 | Box 48 \ 4 Scan028 | |
| Comparison of the Goshawk and Dorris schemes for self-draining induction pipes. | 16th Dec 1921 | Box 48 \ 4 Scan029 | |
| Testing of a 40/50 model, including a cold start with a paraffin mixture. | 16th Dec 1921 | Box 48 \ 4 Scan030 | |
| The limitations of the 40/50 collector and vaporiser system and the need for an improved induction system. | 30th Dec 1921 | Box 48 \ 4 Scan031 | |
| Modifications to the Goshawk 11 engine's induction and exhaust pipes. | 18th Mar 1922 | Box 48 \ 4 Scan032 | |
| Design changes and sending advance blueprints for the Goshawk radiator, fan, and cowling. | 28th Jun 1922 | Box 48 \ 4 Scan033 | |
| Continued letter discussing alterations to the cylinder block and the status of official blueprints. | 4th Jul 1924 | Box 48 \ 4 Scan034 | |
| Exhaust and induction tests for a 20 HP engine, focusing on performance, economy, and heat modifications. | 4th Jul 1924 | Box 48 \ 4 Scan035 | |
| Instructions for completing the installation of the Goshawk-1 induction pipes, exhaust pipes, and carburetter system. | 25th Jul 1922 | Box 48 \ 4 Scan036 | |
| Carburetter and dynamo starter motor arrangements for Goshawk-11 and 40/50 patterns. | 26th Jul 1922 | Box 48 \ 4 Scan037 | |
| Tests conducted on Goshawk induction pipes regarding petrol distribution and engine faults. | 26th Jul 1922 | Box 48 \ 4 Scan038 | |
| Carburettor performance tests with various fuels and heating methods on Goshawk and 40/50 HP models. | 26th Jul 1922 | Box 48 \ 4 Scan039 | |
| Carburetter testing, diagnosing engine hesitation and weakness related to the air valve position and petrol supply from the high-speed jet. | 2nd Feb 1923 | Box 48 \ 4 Scan040 | |
| On the successful testing of a new induction pipe design and a proposal for further experiments on the Marmon engine. | 2nd Feb 1923 | Box 48 \ 4 Scan041 | |
| Testing aluminium washers for induction and exhaust pipes on a 20 HP chassis. | 30th May 1924 | Box 48 \ 4 Scan042 | |
| Tests and proposed modifications to the 20 HP engine's exhaust and induction systems. | 7th Apr 1924 | Box 48 \ 4 Scan043 | |
| Query and suggestion regarding a cost-saving modification to the 20 HP chassis induction system. | 9th Dec 1924 | Box 48 \ 4 Scan044 | |
| Modifications to the Goshawk engine valve gear arrangement. | 10th Feb 1920 | Box 48 \ 4 Scan045 | |
| Modifications to the camshaft casing and valve springs to allow the engine to run at 4,000 rpm. | 10th Feb 1920 | Box 48 \ 4 Scan046 | |
| Parts fitted to a 'Goshawk' engine for testing. | 20th Sep 1920 | Box 48 \ 4 Scan047 | |
| Test results for exhaust valve clearance and tappet noise on the Goshawk engine. | 28th Sep 1920 | Box 48 \ 4 Scan048 | |
| Proportions and performance data for 'Goshawk 11' valve springs. | 25th Jan 1921 | Box 48 \ 4 Scan049 | |
| Modifications to the Coshawk 11 valve gear spring washer. | 17th Oct 1921 | Box 48 \ 4 Scan050 | |
| Directive regarding the non-use of castellated nuts for the cylinder head and valve gear. | 21th Oct 1921 | Box 48 \ 4 Scan051 | |
| Telegram suggesting modifications to an engine to reduce speed roar, such as increasing valve spring strength. | 3rd Nov 1921 | Box 48 \ 4 Scan052 | |
| Telegram received by telephone with instructions for vehicle modifications. | 8th May 1921 | Box 48 \ 4 Scan053 | |
| Requesting information on experimental Goshawk engine valve timing and clearances to decide on alterations for Goshawk II. | 30th Dec 1921 | Box 48 \ 4 Scan054 | |
| Using double valve springs and a modified valve gear cover nut for the Goshawk 11 engine to test high speed vibration. | 11th Feb 1922 | Box 48 \ 4 Scan055 | |
| Stronger valve tappet springs for the Goshawk 11 engine, including an experimental spring and a proposal for standardization. | 16th Feb 1922 | Box 48 \ 4 Scan056 | |
| Request for dynamometer figures and valve timing data for the Goshawk 11 engine, for comparison against other car engines. | 4th Mar 1922 | Box 48 \ 4 Scan057 | |
| Proposal to try a larger, lightened .625' roller on the Goshawk 11 valve rockers to solve issues with flats forming. | 28th Apr 1922 | Box 48 \ 4 Scan058 | |
| Issue of flates forming on Goshawk II valve rockers and a proposal to use a larger roller. | 28th Apr 1922 | Box 48 \ 4 Scan059 | |
| Alterations to cure oil leaks from Goshawk 11 valve gear covers. | 9th May 1922 | Box 48 \ 4 Scan060 | |
| Investigating and resolving oil leaks from Goshawk 11 engine valve gear covers. | 9th May 1922 | Box 48 \ 4 Scan061 | |
| Query seeking more particulars about a No.9 sticking valve on a 6-Goshawk-11 engine. | 12th May 1922 | Box 48 \ 4 Scan062 | |
| Issues with flats forming on Goshawk 11 engine rocker rollers and potential solutions. | 19th May 1922 | Box 48 \ 4 Scan063 | |
| The practical arrangement and degree of slack for rollers in a bore. | 30th May 1922 | Box 48 \ 4 Scan064 | |
| Goshawk 11 outlet water pipe with three connections and the associated drawing. | 30th May 1922 | Box 48 \ 4 Scan065 | |
| Causes of valve troubles, wear, and material changes in post-war cars. | 6th Jun 1922 | Box 48 \ 4 Scan066 | |
| Investigation into causes of increased valve wear, including faulty springs and fuel quality, and the testing of lubrication methods. | 1st Jun 1922 | Box 48 \ 4 Scan067 | |
| Lubricating worn valve guides and a proposal for standardization of replaceable guides. | 1st Jun 1922 | Box 48 \ 4 Scan068 | |
| The poor quality of parts and spanners for the No. 4 Goshawk-11 tappets. | 2nd Jun 1922 | Box 48 \ 4 Scan069 | |
| Modification to the Goshawk 11 cylinder head to prevent cracking when running without water. | 13th Jun 1932 | Box 48 \ 4 Scan070 | |
| Failure of Goshawk rocker rollers during testing and recommending their discontinuation. | 19th Jun 1922 | Box 48 \ 4 Scan071 | |
| Potential design improvements for Goshawk tappet rollers to avoid flats. | 16th Jun 1922 | Box 48 \ 4 Scan072 | |
| Design and potential strengthening of a Goshawk valve gear rocker spindle. | 20th Jun 1922 | Box 48 \ 4 Scan073 | |
| Cancelling rollers on Goshawk engine valves and replacing them with new case-hardened rockers with curved ends. | 21th Jun 1922 | Box 48 \ 4 Scan074 | |
| The design of the Goshawk valve rocker lever without a roller. | 5th Jul 1922 | Box 48 \ 4 Scan075 | |
| On a suggested design by Mr. Royce for quieter Goshawk valve rockers using oil cushioning. | 19th Jul 1922 | Box 48 \ 4 Scan076 | |
| Comparison of valve, port, and cam specifications for Goshawk I and 11 engines. | 26th Oct 1922 | Box 48 \ 4 Scan077 | |
| Goshawk 11 engine with a burnt exhaust valve and reduced power, possibly due to incorrect valve timing. | 27th Nov 1922 | Box 48 \ 4 Scan078 | |
| Instruction to despatch a burnt Goshawk exhaust valve for Mr. Royce's examination. | 12th Dec 1922 | Box 48 \ 4 Scan079 | |
| Cause of a burnt exhaust valve in a Goshawk engine and suggesting a radiator modification to act as a boiling water warning. | 12th Dec 1922 | Box 48 \ 4 Scan080 | |
| Telegram received by telephone regarding production delays, design modifications, and material requirements. | 18th Dec 1922 | Box 48 \ 4 Scan081 | |
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