| Description | Date | Identifier | |
| Rudge-Whitworth wire wheels and bevel pinions for the 20 HP series. | 3rd Jun 1924 | Box 75 \ 1 scan0297 | |
| Table of engine RPM versus MPH for different gears, based on an actual tyre diameter under load. | 5th Jun 1924 | Box 75 \ 1 scan0298 | |
| Design completion of a 4-speed side lever servo drive and gearbox for the Goshawk project. | 27th Jun 1924 | Box 75 \ 1 scan0299 | |
| Development and comparison of 3-speed and 4-speed gearboxes for the Goshawk II chassis. | 19th Aug 1924 | Box 75 \ 1 scan0300 | |
| Gear box ratios for the Goshawk II (3 speed) and Goshawk III (4 speed) models. | 9th Dec 1924 | Box 75 \ 1 scan0301 | |
| Design, performance, and required modifications for the Goshawk 4-speed gearbox. | 1st Dec 1924 | Box 75 \ 1 scan0302 | |
| The performance and gear ratios of a 4-speed gearbox with a right-hand change fitted to a 20 HP car. | 12th Dec 1924 | Box 75 \ 1 scan0303 | |
| Graph of road speed against engine RPM for Goshawk II & III gear ratios. | 15th Dec 1924 | Box 75 \ 1 scan0304 | |
| Table of gear ratios and road speeds for the Goshawk II and III models. | 13th Dec 1924 | Box 75 \ 1 scan0305 | |
| Recommending car 7-G-11 with a 4-speed gearbox for use at 'WW' pending completion of front wheel brakes. | 13th Dec 1924 | Box 75 \ 1 scan0306 | |
| Technical document detailing the chassis gear ratios, engine RPM, and dynamo revs for the Goshawk II & III models. | 12th Feb 1925 | Box 75 \ 1 scan0307 | |
| Specification sheet detailing the gear box ratios for the Goshawk II and Goshawk III models. | 12th Feb 1925 | Box 75 \ 1 scan0308 | |
| Proposal to test gearbox ventilation by drilling a hole in a 20 HP car to address reported oil leaks. | 1st Oct 1925 | Box 75 \ 1 scan0309 | |
| The endurance and strength test of gears in a 20 HP gearbox. | 7th Nov 1928 | Box 75 \ 1 scan0310 | |
| Modifications and prints for the Goshawk II Gear Box. | 17th Mar 1921 | Box 75 \ 1 scan0311 | |
| The material specification for the Goshawk gearbox second motion shaft. | 1st Mar 1921 | Box 75 \ 1 scan0312 | |
| Modifications to the 20 HP second motion shafts, specifically regarding undercutting splines and part numbers. | 3rd Mar 1925 | Box 75 \ 1 scan0313 | |
| Altering piece numbers for Goshawk 11 ground gears for gearbox X.4543. | 29th Aug 1922 | Box 75 \ 1 scan0314 | |
| Blue prints for the grinding of gears for the Goshawk II gearbox. | 4th Aug 1922 | Box 75 \ 1 scan0315 | |
| Proposal and list of drawing numbers for Goshawk II gearbox gears requiring grinding. | 24th Aug 1922 | Box 75 \ 1 scan0316 | |
| Recommending the standardisation of the Goshawk gearbox. | 10th Jan 1933 | Box 75 \ 1 scan0317 | |
| Decision between spiral continuous gears and ground continuous gears for the Goshawk model. | 2nd Feb 1923 | Box 75 \ 1 scan0318 | |
| Circulating standardisation sheet X.4543 regarding the use of ground gears in place of helical gears for continuous gears in the gearbox. | 9th Mar 1923 | Box 75 \ 1 scan0319 | |
| Standardisation of chassis parts, proposing ground gears in place of helical gears in the gearbox to improve silence. | 28th Feb 1923 | Box 75 \ 1 scan0320 | |
| Standardisation of chassis parts by replacing helical with ground gears for continuous gears in the gearbox. | 28th Feb 1923 | Box 75 \ 1 scan0321 | |
| Proposal to test 40/50 and 20HP ground bevel gears for quietness in a standard body car. | 30th Oct 1923 | Box 75 \ 1 scan0322 | |
| The process of instructing the Drawing and Order Offices regarding ground gears. | 17th Dec 1923 | Box 75 \ 1 scan0323 | |
| Request for blueprints and standard parts for an Oil Level Indicator experiment on the 40/50 Chassis. | 26th Nov 1921 | Box 75 \ 2 scan0001 | |
| Return of two oil pressure gauges mounted on a teak board. | 18th Aug 1922 | Box 75 \ 2 scan0002 | |
| Unsatisfactory oil level arrangement on the 40/50 HP model and the development of a new indicator. | 12th Dec 1922 | Box 75 \ 2 scan0003 | |
| Communication regarding a blueprint for a proposed oil level indicator on the 40/50 chassis. | 12th Dec 1922 | Box 75 \ 2 scan0004 | |
| Note on the unsatisfactory performance of the side oil tank in cold weather. | 16th Dec 1922 | Box 75 \ 2 scan0005 | |
| Design of an oil level indicator for the 40/50 chassis, with input from Mr. Royce. | 16th Dec 1922 | Box 75 \ 2 scan0006 | |
| Adoption of a filler plug and oil level gauge for gearboxes. | 12th Jan 1923 | Box 75 \ 2 scan0007 | |
| New scheme for the oil level indicator, superseding a previous one. | 7th Feb 1923 | Box 75 \ 2 scan0008 | |
| Sample oil gauge submitted for testing and potential business from United Brassfounders & Engineers Ltd. | 24th Apr 1923 | Box 75 \ 2 scan0009 | |
| The standardisation of an oil level indicator and its effect on the wheel carrier for the 40/50 model. | 17th May 1923 | Box 75 \ 2 scan0010 | |
| £248 cost to scrap material for an oil level indicator and arranging a meeting in Derby. | 6th Jun 1923 | Box 75 \ 2 scan0011 | |
| Cover note requesting a reply regarding the standardisation of an oil level indicator. | 7th Jun 1923 | Box 75 \ 2 scan0012 | |
| The standardisation of the oil level indicator, cost implications, and using up old stock. | 21th Jun 1923 | Box 75 \ 2 scan0013 | |
| Standardisation of an oil level indicator for the engine, replacing the side oil tank. | 23th May 1923 | Box 75 \ 2 scan0014 | |
| Standardisation sheet for an oil level indicator on the 40/50 chassis, discussing costs and material scrap. | 4th Jun 1923 | Box 75 \ 2 scan0015 | |
| Personal letter from Mr. Olley to Mr. Hives discussing the standardization of an oil level indicator. | 23th Jun 1923 | Box 75 \ 2 scan0016 | |
| Application of an E.A.C. oil level indicator to the standard 40/50 model. | 7th Jul 1923 | Box 75 \ 2 scan0017 | |
| Mr. Royce's dissatisfaction with the oil level indicator design for chassis 6.EX. | 12th Jul 1923 | Box 75 \ 2 scan0018 | |
| Application of an E.A.C. Oil Level Indicator to the 40/50 HP model. | 14th Jul 1923 | Box 75 \ 2 scan0019 | |
| The drawing for a 40/50 oil level indicator and how it can be fitted to an existing crankcase. | 27th Jul 1923 | Box 75 \ 2 scan0020 | |
| Forwarding a letter from Springfield concerning the topic of Oil Level and Drain Cocks. | 22th Aug 1923 | Box 75 \ 2 scan0021 | |
| Letter outlining objections to a new oil level indicator design proposed for use in America. | 14th Aug 1925 | Box 75 \ 2 scan0022 | |
| Suggested changes to an oil level and draining scheme, comparing it with American practices. | 14th Aug 1925 | Box 75 \ 2 scan0023 | |
| Engine sump drainage plugs and filter cleaning intervals. | 3rd Aug 1914 | Box 75 \ 2 scan0024 | |
| Diagrams of an oil level cock and a large drain plug with a sump for collecting dirt. | 3rd Aug 1914 | Box 75 \ 2 scan0025 | |
| Revised drawing for the 40/50 oil level indicator to make it self-balancing and fit more crankcase bolts. | 11th Sep 1923 | Box 75 \ 2 scan0026 | |
| Explaining the preference for using a gauge over a cock to inspect engine oil levels. | 29th Sep 1923 | Box 75 \ 2 scan0027 | |
| Unreliability of the Goshawk 11 petrol level indicator and recommending a re-design. | 15th Sep 1921 | Box 75 \ 2 scan0028 | |
| Proposal for a simple float-type petrol level gauge for the Goshawk chassis, operated by a bevel gear. | 1st Jan 1922 | Box 75 \ 2 scan0029 | |
| Proposed petrol level indicator for the Goshawk 11. | 13th Jan 1922 | Box 75 \ 2 scan0030 | |
| Progress and urgency of fitting a petrol level indicator for the Goshawk 11. | 17th Jan 1922 | Box 75 \ 2 scan0031 | |
| Robustness and potential replacement of Goshawk 11 instrument board oil pressure gauges. | 4th Apr 1933 | Box 75 \ 2 scan0032 | |
| Extract from a Sales Conference discussing petrol tank provisions and indicators for the Goshawk model. | 25th Jul 1922 | Box 75 \ 2 scan0033 | |
| Design and fitting of a petrol level indicator for the Goshawk model. | 27th Jul 1922 | Box 75 \ 2 scan0034 | |
| Units of measurement (gallons vs. litres) on petrol gauges for the Goshawk II and 40/50 HP chassis. | 30th Nov 1922 | Box 75 \ 2 scan0035 | |
| Experimental oil level indicator and a suggested magneto drive scheme. | 12th Dec 1922 | Box 75 \ 2 scan0036 | |
| The suitability of petrol gauges fitted to 20-HP Goshawk chassis. | 7th Feb 1923 | Box 75 \ 2 scan0037 | |
| Design flaws and suggested improvements for a petrol level indicator on the Goshawk engine. | 1st May 1923 | Box 75 \ 2 scan0038 | |
| Design and approval of a Goshawk 11 petrol level indicator dial. | 9th May 1923 | Box 75 \ 2 scan0039 | |
| Suggestions for the finish of the Petrol Level Indicator Glass for the 'Goshawk 11' project. | 11th May 1923 | Box 75 \ 2 scan0040 | |
| Requesting an update on fitting a reserve petrol tank to the Goshawk and 40/50 HP models. | 25th Jul 1923 | Box 75 \ 2 scan0041 | |
| To Mr. Max Pemberton regarding a fault with petrol gauge fibre washers and their replacement with cork washers. | 11th Sep 1923 | Box 75 \ 2 scan0042 | |
| The standardisation of the Goshawk petrol level indicator on the 20 HP model. | 13th Sep 1923 | Box 75 \ 2 scan0043 | |
| Fitting an untested petrol level indicator to the Goshawk-II engine, arguing against skipping the 10,000-mile trial. | 14th Sep 1923 | Box 75 \ 2 scan0044 | |
| Confirming a car fitted with a 2-level tank device will be sent to Conduit Street for review. | 20th Sep 1923 | Box 75 \ 2 scan0045 | |
| Sending a 20 HP car to London to examine and to obtain details of competitor radiators. | 22th Sep 1923 | Box 75 \ 2 scan0046 | |
| Advising of a 20 HP car fitted with a 2-level petrol tank device being sent to Conduit Street. | 24th Sep 1923 | Box 75 \ 2 scan0047 | |
| Telegram concerning a two-level tank device and the whereabouts of 'R.' for the week. | 25th Sep 1923 | Box 75 \ 2 scan0048 | |
| Standardisation of the petrol level indicator to improve appearance and design. | 30th Oct 1923 | Box 75 \ 2 scan0049 | |
| Feedback on the reserve petrol tank tap placement and its proposed implementation. | 19th Dec 1923 | Box 75 \ 2 scan0050 | |
| Telegauge petrol level indicator for a 20-HP chassis, suggesting its use on an experimental car despite Mr. Royce's disapproval. | 28th Aug 1924 | Box 75 \ 2 scan0051 | |
| Design and development of a petrol gauge for the car's fuel tank. | 28th Jan 1920 | Box 75 \ 2 scan0052 | |
| Alternative petrol gauge designs, including those from Sims and Weymann, and considering solutions for accuracy and visibility issues. | 3rd Feb 1920 | Box 75 \ 2 scan0053 | |
| The design and feasibility of a small, thick glass window for a gauge, mentioning a ball cock scheme. | 3rd Feb 1920 | Box 75 \ 2 scan0054 | |
| Different design schemes for a petrol level indicator. | 3rd Aug 1920 | Box 75 \ 2 scan0055 | |
| Continued discussion on float indicator designs for fuel tanks, mentioning an alternative scheme. | 1st Aug 1920 | Box 75 \ 2 scan0056 | |
| And comparing different designs for a petrol gauge, including 'bull eye', bevel geared, and magnetic schemes. | 10th Aug 1920 | Box 75 \ 2 scan0057 | |
| Testing of a glass bezel and the comparative hardness of English and French plate-glass. | 10th Aug 1920 | Box 75 \ 2 scan0058 | |
| Query from Mr. Royce regarding a faulty petrol level indicator on the 40/50 HP model, suggesting the cause may be large apertures in the tank baffles. | 17th Mar 1921 | Box 75 \ 2 scan0059 | |
| Letter discussing the design and placement of a petrol filler and gauge for a luggage carrier, addressing difficulties and proposing solutions. | 28th Jan 1920 | Box 75 \ 2 scan0060 | |
| Modification of the carburettor feed chamber to incorporate a filter for a new back tank on American cars. | 28th Jan 1920 | Box 75 \ 2 scan0061 | |
| Sketch and improvements for a reserve fuel device in a petrol tank. | 1st Jan 1920 | Box 75 \ 2 scan0062 | |
| Diagrammatic drawing and explanation of a reserve fuel device. | 30th Jan 1920 | Box 75 \ 2 scan0063 | |
| Design modifications for the strainer, vent pipe, and reserve fuel supply for the 40/50 HP chassis petrol tank. | 3rd Feb 1920 | Box 75 \ 2 scan0064 | |
| Proposed modifications for a trials car intended for the American company. | 4th Mar 1920 | Box 75 \ 2 scan0065 | |
| The design of a chassis petrol tank, highlighting issues with the current test model. | 29th Jun 1920 | Box 75 \ 2 scan0066 | |
| The urgent adoption of a special petrol tank with specific features for the American market. | 29th Jun 1930 | Box 75 \ 2 scan0067 | |
| Providing remarks on various components and systems for car 6.EX. | 30th Jun 1920 | Box 75 \ 2 scan0068 | |
| Copy of a cable regarding the standardisation of petrol tanks and updates on shock absorbers and spring experiments. | 1st Jul 1920 | Box 75 \ 2 scan0069 | |
| Extract regarding proposed modifications to a petrol tank's level indicator and reserve compartment. | 23th Jul 1920 | Box 75 \ 2 scan0070 | |
| Modifications to petrol gauges and reserve devices, suggesting a double level device and improvements to jointing washers. | 31th Jul 1920 | Box 75 \ 2 scan0071 | |
| Design considerations for a fuel tank, including a double level device and a petrol level indicator. | 31th Jul 1920 | Box 75 \ 2 scan0072 | |
| Suggestions for a modified petrol tank level indicator to meet French Octroi regulations. | 3rd Aug 1920 | Box 75 \ 2 scan0073 | |
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