| Description | Date | Identifier | |
| Arranging for the dispatch of two Solex carburettors to 'Solex' Works in London. | 13th Dec 1937 | Box 121 \ 2 scan0201 | |
| The despatch of one Solex carburetter to Solex Ltd. | 27th Jun 1938 | Box 121 \ 2 scan0202 | |
| Request to acquire and test two Claudel Hobson carburetters on a Mercedes engine. | 3rd Dec 1914 | Box 121 \ 3 scan0001 | |
| Design and material composition of the Claudel Hobson carburetter in comparison to a proprietary water-jacketed design. | 14th Dec 1914 | Box 121 \ 3 scan0002 | |
| Performance of the Claudel Hobson carburetter and awaiting experiments with induction pipes. | 14th Dec 1914 | Box 121 \ 3 scan0003 | |
| Requirements and design of a new carburettor for an engine. | 15th Dec 1914 | Box 121 \ 3 scan0004 | |
| Carburetter design for three-cylinder engines and a request to progress the patterns. | 15th Dec 1914 | Box 121 \ 3 scan0005 | |
| The issues with Claudel carburetters freezing on Renault engines and the requirement for a hot air pipe. | 13th Aug 1914 | Box 121 \ 3 scan0006 | |
| The testing of Claudel, Hobson carburettors on a Mercedes engine as requested by Mr. Royce. | 16th Dec 1914 | Box 121 \ 3 scan0007 | |
| Report comparing a Claudel carburetter against a standard one, detailing performance data and subsequent piston failure. | 12th Jan 1915 | Box 121 \ 3 scan0008 | |
| Returning undersized Sthenos carburettors and arranging a consultation with a Claudel expert. | 8th Dec 1914 | Box 121 \ 3 scan0009 | |
| The suitability of the Claudel Hobson carburetter for car and aero engines. | 15th Jan 1915 | Box 121 \ 3 scan0010 | |
| The invoicing of Claudel Hobson carburetter jets for the Experimental Department. | 20th Jan 1915 | Box 121 \ 3 scan0011 | |
| Terms for obtaining Claudel Hobson carburettors on an approval basis. | 21th Jan 1915 | Box 121 \ 3 scan0012 | |
| Clarifying the subject of a previous sheet concerned 4 carburetter jets. | 22th Jan 1915 | Box 121 \ 3 scan0013 | |
| Inquiring about the suitability of a Claudel Hobson 26 m/m carburetter for the standard car engine. | 5th Feb 1915 | Box 121 \ 3 scan0014 | |
| Letter to H.M. Hobson Ltd. regarding an additional lever on newly received Claudel Hobson carburetters. | 9th Feb 1915 | Box 121 \ 3 scan0015 | |
| Confirming the charge for four Claudel-Hobson Carburetter Jets. | 27th Jan 1915 | Box 121 \ 3 scan0016 | |
| Letter from H.M. Hobson Ltd. regarding the bye-pass lever on 36 m/m Claudel Hobson carburettors, which is being discarded on later models. | 10th Feb 1915 | Box 121 \ 3 scan0017 | |
| Testing a 36 m/m Claudel Hobson carburetter, comparing its performance to a standard R.R. model. | 23th Feb 1916 | Box 121 \ 3 scan0018 | |
| Performance comparison between the standard carburetter and a Claudel carburetter, including test data. | 26th Feb 1915 | Box 121 \ 3 scan0019 | |
| Discussion following tests on a Claudel Hobson carburetter, considering compression changes and potential horsepower gains. | 26th Feb 1915 | Box 121 \ 3 scan0020 | |
| Engine compression, carburettor selection, and component choices for various aero and car engines. | 26th Feb 1915 | Box 121 \ 3 scan0021 | |
| Required carburetter, compression, and fuel consumption specifications for 200 HP Aero Engines. | 26th Feb 1915 | Box 121 \ 3 scan0022 | |
| Copy of a wire from Mr. Royce with instructions for engine modifications. | 2nd Mar 1915 | Box 121 \ 3 scan0023 | |
| Extract discussing the replacement of a 36 m/m Claudel-Hobson carburetter with a smaller one for improved mixture and economy. | 2nd Mar 1915 | Box 121 \ 3 scan0024 | |
| Extract discussing the suitability of Claudel-Hobson carburetters for a governed engine. | 7th Apr 1915 | Box 121 \ 3 scan0025 | |
| The selection of Claudel Hobson carburettors for the 225 HP engine. | 8th Apr 1915 | Box 121 \ 3 scan0026 | |
| Extract from a communication regarding experiments with Claudel-Hobson carburetters to resolve engine missing fire. | 16th Apr 1915 | Box 121 \ 3 scan0027 | |
| Extract comparing the R.R. carburetter with the Claudel Hobson carburetter for aero work. | 29th Apr 1915 | Box 121 \ 3 scan0028 | |
| Urgent internal order for Claudel Hobson carburettors and a selection of main and low-speed jets. | 30th Apr 1915 | Box 121 \ 3 scan0029 | |
| Extract discussing the performance of Claudel-Hobson carburetters, particularly regarding air intake and suction pipe length. | 25th May 1916 | Box 121 \ 3 scan0030 | |
| Wire from Mr. Royce regarding the choice between Zenith and Claudel carburettors and a damaged component. | 26th Jul 1916 | Box 121 \ 3 scan0031 | |
| Design, specifications and required experiments for a Claudel-Hobson carburettor for the 'Eagle' engine. | 31th Jul 1916 | Box 121 \ 3 scan0032 | |
| Inquiry to Claudel Hobson Ltd. regarding the experimental fitting of two vertical carburetters to a 7.5 litre car engine. | 19th Nov 1926 | Box 121 \ 3 scan0033 | |
| Letter from H.M. Hobson, Ltd. regarding two vertical carburetters for a 7.5 litre car engine. | 20th Nov 1926 | Box 121 \ 3 scan0034 | |
| Various induction pipe and carburetter configurations for the Phantom model. | 20th Feb 1927 | Box 121 \ 3 scan0035 | |
| Query about making the Claudel Hobson Carburettor a standard part for production. | 15th Feb 1928 | Box 121 \ 3 scan0036 | |
| Running conditions and camshaft timing tests for 'SS' Engine No. SS-3. | 20th Sep 1928 | Box 121 \ 3 scan0037 | |
| Report page discussing camshaft power curves, vacuum pump lubrication, and tappet adjustment. | 17th Sep 1929 | Box 121 \ 3 scan0038 | |
| Questioning the performance and configuration of different carburettor types like Claudel and Solex. | 17th Sep 1929 | Box 121 \ 3 scan0039 | |
| Comparison of power output from Claudel and S.U. type single jet carburettors on a P10G0 engine. | 28th Oct 1931 | Box 121 \ 3 scan0040 | |
| Photograph of a carburetor and governor assembly. | 28th Oct 1931 | Box 121 \ 3 scan0041 | |
| Photograph of a carburetor and intake manifold assembly with a ruler placed on top for scale. | 28th Oct 1931 | Box 121 \ 3 scan0042 | |
| Performance comparison graph of different induction pipes and carburetors. | 4th Nov 1936 | Box 121 \ 3 scan0043 | |
| Letter from H.M. Hobson Components Ltd. arranging a visit to demonstrate a carburetter as an alternative source of supply. | 4th Nov 1936 | Box 121 \ 3 scan0044 | |
| List of points for discussion on car carburation and aero engine controls. | 4th Nov 1936 | Box 121 \ 3 scan0045 | |
| Letter from H.M. Hobson Components Ltd. regarding carburetter development and testing for the Merlin engine. | 4th Nov 1936 | Box 121 \ 3 scan0046 | |
| Page two of a letter to E. W. Hives from the Technical Director of H. M. Hobson (Aircraft & Motor) Components, Ltd. | 4th Nov 1936 | Box 121 \ 3 scan0047 | |
| Points for a discussion regarding car carburation and automatic aero engine controls. | 4th Nov 1936 | Box 121 \ 3 scan0048 | |
| Letter to H.M. Hobson Ltd. discussing the price competitiveness of a proposed carburetter (type N.42) following a price reduction from Stromberg Carburetter Co. | 12th Feb 1937 | Box 121 \ 3 scan0049 | |
| Letter from H.M. Hobson to W.A. Robotham regarding the proposed 42 m/m carburetter and its potential testing. | 15th Feb 1937 | Box 121 \ 3 scan0050 | |
| Letter from S.U. Carburetter Co. Ltd. confirming an order for 6 pairs of H.6 carburetters with a 14-day delivery time. | 3rd Jul 1939 | Box 121 \ 3 scan0051 | |
| Letter from S.U. Carburetter Co. Ltd. regarding the delivery schedule for H.6 Carburetters. | 3rd Jul 1939 | Box 121 \ 3 scan0052 | |
| The issue of a free of charge order for attached sheets from the S.U. Company. | 13th Jul 1939 | Box 121 \ 3 scan0053 | |
| Letter to S.U. Carburetter Co. Ltd. regarding incorrect parts supplied for H.4 and H.6 carburetters. | 19th Jul 1939 | Box 121 \ 3 scan0054 | |
| The concluding page of a typed letter expressing inconvenience. | 19th Jul 1939 | Box 121 \ 3 scan0055 | |
| Letter from S.U. Carburetter Co. Ltd. regarding carburetters not meeting specification. | 20th Jul 1939 | Box 121 \ 3 scan0056 | |
| Letter to the S.U. Carburetter Co. Ltd. regarding carburetter needle seatings and flooding issues. | 21th Jul 1939 | Box 121 \ 3 scan0057 | |
| Letter to The S.U. Carburetter Co. Ltd. requesting specifications for H.4 and H.6 carburetters. | 21th Jul 1919 | Box 121 \ 3 scan0058 | |
| Letter from S.U. Carburetter Co. Ltd. addressing float chamber flow, flooding, and fork gear issues for H.4 and H.6 carburetters. | 24th Jul 1939 | Box 121 \ 3 scan0059 | |
| The supply and ordering of jets. | 26th Jul 1939 | Box 121 \ 3 scan0060 | |
| The despatch of replacement carburetter parts to the S.U. Carburetter Co. Ltd. | 26th Jul 1939 | Box 121 \ 3 scan0061 | |
| Internal request to order 24 BE3 needles from the S.U. Carburetter Co. for use on B.V. | 11th Aug 1939 | Box 121 \ 3 scan0062 | |
| Letter from S.U. Carburetter Co. requesting a print for the sizes of the XC3 needle. | 1st Sep 1939 | Box 121 \ 3 scan0063 | |
| Requesting an order be passed to the Zenith Carburetter Co. Ltd. for parts with the possibility of return for credit. | 28th Sep 1939 | Box 121 \ 3 scan0064 | |
| Letter to S.U. Carburetter Co. Ltd. providing dimensions for carburetter needle X.C.3. | 28th Sep 1939 | Box 121 \ 3 scan0065 | |
| Letter from S.U. Carburetter Co. Ltd. proposing a visit to demonstrate a new type of self-feeding carburetter. | 5th Feb 1940 | Box 121 \ 3 scan0066 | |
| Request to S.U. Carburettor Co. Ltd. for the supply of four types of carburettor needles with specified dimensions. | 12th Mar 1940 | Box 121 \ 3 scan0067 | |
| Request to send an order to S.U. Carburettor Co. for 16 needles, referencing a previous letter. | 13th Mar 1940 | Box 121 \ 3 scan0068 | |
| Order be sent to The S.U. Carburetter Co. Ltd. for various carburettor needles. | 29th Apr 1940 | Box 121 \ 3 scan0069 | |
| Request to S. U. Carburettor Co. Ltd. for the supply of carburettor needles with specified dimensions. | 29th Apr 1940 | Box 121 \ 3 scan0070 | |
| Letter from The S.U. Carburetter Co. Ltd. discussing the development progress of small and large self-feeding carburetters. | 15th May 1940 | Box 121 \ 3 scan0071 | |
| Letter discussing carburetter design issues and outlining future development plans. | 21th Jun 1940 | Box 121 \ 3 scan0072 | |
| Telegram requesting S.U. carburettor drawings. | 21th Jun 1940 | Box 121 \ 3 scan0073 | |
| Letter from S.U. Carburetter Co. Ltd. enclosing prints for an AVT.40/193 carburetter. | 24th Jun 1940 | Box 121 \ 3 scan0074 | |
| Request to place an order for 12 B.3.B carburettor needles from The S.U. Carburettor Co. Ltd. | 3rd Jul 1940 | Box 121 \ 3 scan0075 | |
| Letter from The S.U. Carburetter Co. Ltd. regarding a delay in sending a drawing for a large Self-Feeding Carburetter. | 8th Jul 1940 | Box 121 \ 3 scan0076 | |
| Letter thanking S.U. Carburettor Co. Ltd. for a letter and prints of the AVT.40/193 carburettor. | 10th Jul 1940 | Box 121 \ 3 scan0077 | |
| Record and production layout of the mock-up induction pipe and S.U. carburettors. | 1st Aug 1940 | Box 121 \ 3 scan0078 | |
| Letter from S.U. Carburetter Co. Ltd. rescheduling a meeting due to Mr. T.C. Skinner being indisposed. | 10th Oct 1940 | Box 121 \ 3 scan0079 | |
| Letter to S.U. Carburettors Ltd. discussing research into carburation and fuel consumption. | 8th Oct 1940 | Box 121 \ 3 scan0080 | |
| Letter discussing the development of a lean-mixture device for an S.U. carburettor and arranging a meeting. | 8th Oct 1940 | Box 121 \ 3 scan0081 | |
| Letter from The S.U. Carburetter Co. Ltd. to Mr. W.A. Robotham apologising for a delayed response and extending an invitation to visit. | 30th Oct 1940 | Box 121 \ 3 scan0082 | |
| Reference note for a letter to S.U. Carburetters Ltd regarding Petrol Injection Equipment. | 5th Nov 1940 | Box 121 \ 3 scan0083 | |
| Letter to S.U. Carburetters Ltd. arranging a visit to discuss petrol injection equipment and comparative consumption tests. | 5th Nov 1940 | Box 121 \ 3 scan0084 | |
| Letter from The S.U. Carburetter Co. Ltd. to Mr. Robotham confirming arrangements for a meeting. | 8th Nov 1940 | Box 121 \ 3 scan0085 | |
| Letter to C. Skinner of The S.U. Carburettor Co. Ltd. to arrange a works visit. | 10th Nov 1940 | Box 121 \ 3 scan0086 | |
| Letter to S.U. Carburetters Ltd. regarding petrol injection equipment and comparative consumption tests. | 5th Nov 1940 | Box 121 \ 3 scan0087 | |
| Letter to S.U. Carburettors Ltd. outlining requirements for carburettors, a petrol pump, and an induction centre. | 13th Nov 1940 | Box 121 \ 3 scan0088 | |
| Visit to the S.U. Company to discuss fitting carburettors to a Merlin engine. | 14th Nov 1940 | Box 121 \ 3 scan0089 | |
| Carburettor and intake pipe design, including S.U. horizontal and downdraught carburettors, and petrol pumps. | 14th Nov 1940 | Box 121 \ 3 scan0090 | |
| Carburetor issues, including sticking air valves and a comparison of materials and designs. | 14th Nov 1940 | Box 121 \ 3 scan0091 | |
| Trial of an S.U. recommended induction pipe on a 4-cylinder engine. | 17th Nov 1940 | Box 121 \ 3 scan0092 | |
| Drawing showing the recommended form of the center section of a manifold for a single carburettor 4 or 6-cylinder engine. | 12th Nov 1926 | Box 121 \ 3 scan0093 | |
| Letter from S.U. Carburetter Co. Ltd. regarding the delayed supply of carburetters and an enclosed stronger needle for an 8 HP Morris. | 18th Nov 1940 | Box 121 \ 3 scan0094 | |
| Letter to S.U. Carburettors discussing carburettor performance, economy, and design considerations. | 18th Nov 1940 | Box 121 \ 3 scan0095 | |
| Letter to S.U. Carburetter Co. about sticking air valves on the H.4 model carburetter. | 19th Nov 1940 | Box 121 \ 3 scan0096 | |
| Letter from S.U. Carburetter Co. Ltd. discussing the weakening of fuel mixtures under cruising conditions. | 28th Nov 1940 | Box 121 \ 3 scan0097 | |
| Tests and modifications related to carburettors, air pipes, and silencers, referencing Morris Motors. | 28th Nov 1940 | Box 121 \ 3 scan0098 | |
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