| Description | Date | Identifier | |
| Page discussing the agreement on a vaporiser and the experimental status of an exhaust-heated throttle. | 8th Dec 1921 | Box 31 \ 3 Scan069 | |
| Modifications to the carburetter and throttle for improved engine starting. | 8th Dec 1921 | Box 31 \ 3 Scan070 | |
| Design and performance of self-draining induction pipes, comparing the 'Dorris' scheme to the Goshawk pipe. | 16th Dec 1921 | Box 31 \ 3 Scan071 | |
| Fitting a new starter carburetter to the 6.EX car and the impressive cold-start performance of the latest 40/50 model. | 16th Dec 1921 | Box 31 \ 3 Scan072 | |
| Starting difficulties in cold weather and the feasibility of design alterations. | 3rd Feb 1922 | Box 31 \ 3 Scan073 | |
| Analysis of engine starting issues related to clutch, battery, Bendix drives, and cold weather performance. | 3rd Feb 1922 | Box 31 \ 3 Scan074 | |
| Engine characteristics, starter motor issues, and the development of a post-war 3-speed gearbox. | 3rd Feb 1922 | Box 31 \ 3 Scan075 | |
| Recommendations for engine starting issues in cold weather, focusing on lubrication and battery maintenance. | 10th Dec 1920 | Box 31 \ 3 Scan076 | |
| Technical note on improving engine starting procedures and carburetter design for aero engines. | 10th Dec 1920 | Box 31 \ 3 Scan077 | |
| Difficulty of starting engines from cold, referencing a specific case. | 28th Feb 1929 | Box 31 \ 3 Scan078 | |
| Difficulty of starting the 40/50 model from cold compared to American competitors. | 18th Feb 1929 | Box 31 \ 3 Scan079 | |
| Comparing the ease of starting engines from cold with other car makes, specifically American cars like Chrysler. | 1st Mar 1929 | Box 31 \ 3 Scan080 | |
| Instruction to determine the lubrication frequency for the universal joint behind the gearbox. | 8th Dec 1914 | Box 31 \ 3 Scan081 | |
| Requesting a test to determine the lubrication frequency for universal joints. | 8th Dec 1914 | Box 31 \ 3 Scan082 | |
| Quoting Mr. Royce on instructions for the lubrication of a universal joint. | 29th Jan 1915 | Box 31 \ 3 Scan083 | |
| Lubrication frequency of the universal joint and torque tube sphere. | 15th Apr 1915 | Box 31 \ 3 Scan084 | |
| Recommendation to update the Instruction Book for a joint to run 2000 miles without additional lubrication. | 4th Sep 1919 | Box 31 \ 3 Scan085 | |
| Lubrication interval for the Universal Joint for the instruction book. | 5th May 1915 | Box 31 \ 3 Scan086 | |
| Querying the effectiveness of the lubrication scheme for universal joints. | 7th Jun 1915 | Box 31 \ 3 Scan087 | |
| Requesting a reply regarding Mr. Northey's remarks on the lubrication of universal joints. | 18th Jun 1915 | Box 31 \ 3 Scan088 | |
| Requesting a reply regarding the effectiveness of the current lubrication scheme for universal joints. | 15th Jul 1915 | Box 31 \ 3 Scan089 | |
| History and proposed modifications for the lubricator on the rear universal joint. | 20th Jun 1924 | Box 31 \ 3 Scan090 | |
| Oil leakage from the Goshawk 11 propeller shaft and axle joints, damaging carpets, with a suggested solution. | 1st Jul 1924 | Box 31 \ 3 Scan091 | |
| Oil leakage from the propeller shaft joint and a proposed solution. | 7th Mar 1924 | Box 31 \ 3 Scan092 | |
| On the lubrication weakness of a Phantom Chassis universal joint, proposing revised maintenance intervals. | 10th Aug 1928 | Box 31 \ 3 Scan093 | |
| Lubrication schedule and method for the Phantom chassis universal joint sphere. | 8th Oct 1928 | Box 31 \ 3 Scan094 | |
| Lubrication of the Phantom chassis universal joint and sphere. | 9th Oct 1928 | Box 31 \ 3 Scan095 | |
| The cause of universal joint failures and recommended oiling procedures. | 12th Oct 1928 | Box 31 \ 3 Scan096 | |
| The lubrication of the universal joint on the Phantom chassis. | 12th Oct 1928 | Box 31 \ 3 Scan097 | |
| Trying a stainless steel plug and expressing concerns over the lubrication system for a clutch joint. | 17th Oct 1928 | Box 31 \ 3 Scan098 | |
| Excessive wear on 40/50 spheres and requesting a faulty universal joint for inspection. | 3rd Nov 1928 | Box 31 \ 3 Scan099 | |
| Modifications and lubrication for the serrated universal joint and SS clutch shaft. | 19th Feb 1929 | Box 31 \ 3 Scan100 | |
| Recommended grease for universal joints on 20/25 and 40/50 HP chassis. | 29th May 1934 | Box 31 \ 3 Scan101 | |
| Article from 'Autocar' magazine discussing the British S.U. carburettor, its design, and function. | 15th Oct 1914 | Box 31 \ 4 Scan001 | |
| Inquiry to S.U. Carburetter Co. Ltd. for particulars of a carburetter suitable for a 3-litre engine. | 1st Feb 1922 | Box 31 \ 4 Scan002 | |
| Letter from the S.U. Company regarding the suitability of their carburettors for a 3-litre engine, enclosing a catalogue. | 2nd Feb 1922 | Box 31 \ 4 Scan003 | |
| Brochure for the S.U. Carburetter. | 3rd Mar 1922 | Box 31 \ 4 Scan004 | |
| Letter to S.U. Company Ltd. requesting a type G2 Carburetter for a six-cylinder engine. | 3rd Feb 1922 | Box 31 \ 4 Scan005 | |
| Letter from the S.U. Company regarding the suitability of a carburetter for a 6-cylinder engine. | 4th Feb 1922 | Box 31 \ 4 Scan006 | |
| Letter to S.U. Company Ltd. requesting a specific carburetter for testing, stating the engine's induction pipe diameter. | 6th Feb 1922 | Box 31 \ 4 Scan007 | |
| Letter from S.U. Company Ltd. regarding the specifications and dispatch of a Controllable Jet Type carburetter. | 7th Feb 1922 | Box 31 \ 4 Scan008 | |
| Letter to S.U. Co. Ltd. inquiring about the despatch of carburettors. | 21th Feb 1922 | Box 31 \ 4 Scan009 | |
| Letter from S.U. Carburetter regarding the dispatch of a G3 carburetter and a request to postpone testing due to Mr. Skinner's illness. | 22th Feb 1922 | Box 31 \ 4 Scan010 | |
| Letter from S.U. Company, Ltd. concerning the delivery and testing of a G5 carburetter. | 22th Feb 1922 | Box 31 \ 4 Scan011 | |
| Letter from S.U. Company, Ltd. regarding a postponed works visit by Mr. Skinner due to illness. | 2nd Mar 1922 | Box 31 \ 4 Scan012 | |
| Letter from S.U. Company Ltd. acknowledging a wire regarding the cancellation of a meeting with Mr. Skinner. | 6th Mar 1922 | Box 31 \ 4 Scan013 | |
| Letter to The S.U. Carburetter Co. Ltd. arranging a trial for their carburetter on a car. | 7th Mar 1922 | Box 31 \ 4 Scan014 | |
| Advice note from S.U. Company, Ltd. detailing the despatch of various carburetter needles. | 9th Mar 1922 | Box 31 \ 4 Scan015 | |
| Letter from S.U. Company Ltd. regarding the scheduling of a carburetter test for their representative. | 8th Mar 1922 | Box 31 \ 4 Scan016 | |
| Letter from S.U. Company Ltd. regarding the postponement of carburetter bench tests due to an employee's illness. | 9th Mar 1922 | Box 31 \ 4 Scan017 | |
| Carburation issues on 40/50 cars and proposing a trial of an S.U. carburetter. | 14th Mar 1922 | Box 31 \ 4 Scan018 | |
| Telegram received by telephone regarding carburettors to be collected from Derby station. | 14th Aug 1946 | Box 31 \ 4 Scan019 | |
| Telegram from Johnson to Hives regarding persuading Mr Royce to adapt the S U carburettor. | 15th Mar 1922 | Box 31 \ 4 Scan020 | |
| The poor performance of the 'Goshawk' Limousine and the recommendation to use an S.U. carburetter. | 20th Mar 1922 | Box 31 \ 4 Scan021 | |
| Fitting an S.U. Carburetter to a Goshawk Limousine for further testing. | 21th Mar 1922 | Box 31 \ 4 Scan022 | |
| The poor performance of a 'Goshawk' Limousine and potential improvements from a new carburettor. | 20th Mar 1932 | Box 31 \ 4 Scan023 | |
| Fitting an S.U. Carburetter to a Goshawk Limousine and arranging a performance test. | 21th Mar 1922 | Box 31 \ 4 Scan024 | |
| Post Office telegram message regarding an agreement for an experiment. | 25th Mar 1922 | Box 31 \ 4 Scan025 | |
| Experiments and performance issues with S.U. carburetters on Goshawk-11 cars. | 27th Mar 1922 | Box 31 \ 4 Scan026 | |
| Ongoing car performance issues, carburetter trials, and an investigation into a persistent water loss problem. | 27th Mar 1922 | Box 31 \ 4 Scan027 | |
| Engine cooling, steering shocks, cut-outs, and front shock absorbers for Goshawk and 40/50 models. | 27th Mar 1922 | Box 31 \ 4 Scan028 | |
| Telegram received by telephone regarding the Experimental Department. | 27th Mar 1922 | Box 31 \ 4 Scan029 | |
| Suggestions for Goshawk 11 engine carburation improvements and test feedback. | 2nd Apr 1922 | Box 31 \ 4 Scan030 | |
| Discouraging suggestions on established car designs and emphasizing adherence to existing instructions. | 26th Jul 1922 | Box 31 \ 4 Scan031 | |
| Tests on Goshawk engine induction pipes regarding petrol distribution and performance with inferior fuel. | 26th Jul 1922 | Box 31 \ 4 Scan032 | |
| Carburettor performance tests using various fuels, including paraffin mixtures, on Goshawk and 40/50 HP models. | 26th Jul 1922 | Box 31 \ 4 Scan033 | |
| Test report on carburetter hesitation issues related to the air valve and high-speed jet fuel supply. | 26th Feb 1923 | Box 31 \ 4 Scan034 | |
| Test results for an S.U. Carburetter with standard and heated induction pipes. | 26th Feb 1923 | Box 31 \ 4 Scan035 | |
| Power and jet consumption data table for an S.U. carburetter with an experimental pipe. | 26th Feb 1923 | Box 31 \ 4 Scan036 | |
| The return of S.U. type carburettors to the S.U. Co. | 19th Mar 1923 | Box 31 \ 4 Scan037 | |
| Specification and price list for the H.V. Type Horizontal Controllable S.U. Jet Carburetter. | 1st Oct 1925 | Box 31 \ 4 Scan038 | |
| Informational leaflet on the efficiency and economy of the H.V. Type Horizontal Controllable Jet S.U. Carburetter. | 1st Oct 1925 | Box 31 \ 4 Scan039 | |
| Suggestion to test an improved horizontal S.U. carburetter on the 20 HP model. | 19th Oct 1927 | Box 31 \ 4 Scan040 | |
| Request for particulars of an improved horizontal S.U. carburetter for the 20 HP car. | 21th Oct 1927 | Box 31 \ 4 Scan041 | |
| Inquiry to S.U. Carburetter Co. regarding the suitability and price of their carburetters for a 40/50 HP engine. | 8th Jun 1931 | Box 31 \ 4 Scan042 | |
| Letter from The S.U. Company acknowledging receipt of a letter and promising a detailed reply the following day. | 9th Jun 1931 | Box 31 \ 4 Scan043 | |
| Letter to the S.U. Co. regarding the testing of carburetters and petrol pumps. | 13th Jun 1931 | Box 31 \ 4 Scan044 | |
| Letter from S.U. Company requesting carburetter centre dimensions for 25 and 40 HP cars. | 16th Jun 1931 | Box 31 \ 4 Scan045 | |
| Letter from The S.U. Company regarding a delay in carburettor production due to a foundry flood and supply of a Petrolift. | 16th Jun 1931 | Box 31 \ 4 Scan046 | |
| Letter to the S.U. Carburetter Co. regarding the distance between carburetter centres on induction manifolds. | 17th Jun 1931 | Box 31 \ 4 Scan047 | |
| Request to S.U. Carburetter Co. for a carburettor to test on a 3 1/2 litre engine. | 23th Jun 1931 | Box 31 \ 4 Scan048 | |
| Letter from The S.U. Company regarding the supply of alternative carburetter needles. | 26th Jun 1931 | Box 31 \ 4 Scan049 | |
| Letter to the S.U. Carburetter Co. regarding encouraging test results for four carburetters on a 25 HP car. | 29th Jun 1931 | Box 31 \ 4 Scan050 | |
| Letter from The S.U. Company to W.A. Robotham regarding a satisfactory job and arranging a visit. | 30th Jun 1931 | Box 31 \ 4 Scan051 | |
| Letter from The S.U. Company regarding the supply of two pairs of larger carburetter needles for performance feedback. | 2nd Jul 1931 | Box 31 \ 4 Scan052 | |
| Letter to S.U. Carburetter Co. requesting weaker needles and a range of jets for 40/50 and 25 HP engine testing. | 4th Jul 1931 | Box 31 \ 4 Scan053 | |
| Letter from The S.U. Company regarding the dispatch of weaker and alternative carburetter needles. | 4th Jul 1931 | Box 31 \ 4 Scan054 | |
| Letter to The S.U. Company discussing metering results for a carburetter needle and a richness issue at slow speeds. | 6th Jul 1931 | Box 31 \ 4 Scan055 | |
| Letter from The S.U. Company regarding the enclosure of two carburetter needles, G.I. and G.O., along with their charts. | 8th Jul 1931 | Box 31 \ 4 Scan056 | |
| The receipt of carburettors and associated parts from The S.U. Company. | 9th Jul 1931 | Box 31 \ 4 Scan057 | |
| The modification of S.U. downdraught carburetters. | 14th Jul 1931 | Box 31 \ 4 Scan058 | |
| Letter to the S.U. Carburetter Co. providing a summary of tests on various carburettors for 25 HP and 40/50 models. | 25th Jul 1931 | Box 31 \ 4 Scan059 | |
| Letter discussing issues with an S.U. carburetter, including slow running and noise, and arranging further testing. | 25th Jul 1931 | Box 31 \ 4 Scan060 | |
| Return of a loaned horizontal carburetter to the S.U. Carburetter Co. | 25th Jul 1931 | Box 31 \ 4 Scan061 | |
| Letter from The S.U. Company regarding carburettors for silencing investigations. | 27th Jul 1931 | Box 31 \ 4 Scan062 | |
| Test run report for an S.U. carburettor, type H.V.5, on a 12-GIV chassis. | 4th Aug 1931 | Box 31 \ 4 Scan063 | |
| Carburetter performance tests at Brooklands comparing standard and S.U. carburetters with different bonnet types. | 6th Aug 1931 | Box 31 \ 4 Scan064 | |
| Performance and consumption test results for an S.U. carburetter with strong and weak mixture settings. | 11th Aug 1931 | Box 31 \ 4 Scan065 | |
| Letter from The S.U. Company arranging a visit to discuss silencing and dashpot dampening. | 11th Aug 1931 | Box 31 \ 4 Scan066 | |
| Performance test results for different carburetter and bonnet configurations at Brooklands. | 13th Aug 1931 | Box 31 \ 4 Scan067 | |
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