| Description | Date | Identifier | |
| Data table recording hot spot temperature, thermostat movement, and choke movement over time. | 6th Mar 1940 | Box 123 \ 1 scan0039 | |
| The operation of a choke valve, its disadvantages, and a proposal for an improved bi-metal unit with manual seasonal settings. | 6th Mar 1940 | Box 123 \ 1 scan0040 | |
| Close-up view of a carburettor and intake manifold assembly within an engine bay. | 15th Mar 1940 | Box 123 \ 1 scan0041 | |
| Investigation into automatic starting carburettors for S.U. systems. | 15th Mar 1940 | Box 123 \ 1 scan0042 | |
| Requesting to expedite the machining of urgently required induction pipes due to poor promised dates for patterns. | 29th Mar 1940 | Box 123 \ 1 scan0043 | |
| Delivery schedule for Induction Pipe patterns, listing part numbers, types, bores, and promised dates. | 2nd Feb 1940 | Box 123 \ 1 scan0044 | |
| Requirement for specific B.V. induction pipes and a scrapped casting. | 5th Apr 1940 | Box 123 \ 1 scan0045 | |
| Summary report on eight-cylinder carburation, detailing the effects of throttle bore diameter and idle systems. | 24th Apr 1940 | Box 123 \ 1 scan0046 | |
| Data sheet and discussion on carburettor specifications, acceleration figures, and the effect of throttle bore diameter. | 24th Apr 1940 | Box 123 \ 1 scan0047 | |
| Engine economy, throttles, and choke sizes, with performance data. | 24th Apr 1940 | Box 123 \ 1 scan0048 | |
| Carburettor operation, focusing on the idle system, reverse air bleeds, and performance comparisons. | 24th Apr 1940 | Box 123 \ 1 scan0049 | |
| Dual carburettor modifications to improve idling performance. | 24th Apr 1940 | Box 123 \ 1 scan0050 | |
| Graph showing constant speed petrol consumption, comparing a 4B50 model with a 1939 Century Buick. | 3rd Apr 1940 | Box 123 \ 1 scan0051 | |
| Blueprint showing the layout of a dual Stromberg carburettor idle system. | 5th Apr 1940 | Box 123 \ 1 scan0052 | |
| Graph plotting constant speed petrol consumption (MPG vs MPH) for various vehicle and carburettor configurations. | 5th Apr 1940 | Box 123 \ 1 scan0053 | |
| Progress report on carburetion and performance tests on experimental cars. | 22th May 1940 | Box 123 \ 1 scan0054 | |
| Carburetter adjustments, low water temperature issues, and improvements to petrol consumption. | 22th May 1940 | Box 123 \ 1 scan0055 | |
| Modifications to the S.U. Startex Carburetter to prevent it from freezing up. | 29th May 1940 | Box 123 \ 1 scan0056 | |
| Performance and petrol consumption tests on a Bentley Car 11 B.V. (Unit B.80 No.3) with Duplex Stromberg and 3 S.U. carburettors. | 29th May 1940 | Box 123 \ 1 scan0057 | |
| Comparison of fuel consumption figures for Stromberg versus 3 S.U. carburettors, including road test data and vehicle specifications. | 29th May 1940 | Box 123 \ 1 scan0058 | |
| Modifications to the S.U. Startex carburetter to prevent it from freezing up. | 29th May 1940 | Box 123 \ 1 scan0059 | |
| Query regarding the testing status of the latest 6- and 8-cylinder induction pipes. | 6th Jun 1940 | Box 123 \ 1 scan0060 | |
| Blueprints for new parts for throttle controls to suit twin 1 3/4 S.U. carburettors. | 17th Jul 1940 | Box 123 \ 1 scan0061 | |
| Specifications for a separate building to house carburetter and fuel pump test rigs, focusing on fire safety. | 7th Aug 1940 | Box 123 \ 1 scan0062 | |
| Building and safety requirements for carburetter and fuel pump test rigs. | 7th Aug 1940 | Box 123 \ 1 scan0063 | |
| Carburettor intake air temperature issues in cold weather and proposing radiator and bypass solutions. | 23th Oct 1940 | Box 123 \ 1 scan0064 | |
| Carburation for the post-war rationalised range of cars, focusing on fuel economy and comparing carburettor types. | 15th Nov 1940 | Box 123 \ 1 scan0065 | |
| Proposal for testing a 'hot spot' to investigate its effect on fuel economy. | 15th Nov 1940 | Box 123 \ 1 scan0066 | |
| Inquiry to Solex Ltd. regarding governor type carburettors. | 20th Nov 1940 | Box 123 \ 1 scan0067 | |
| Follow-up letter to the S.U. Carburetter Co. regarding sticking air valves on the H.4 carburetter and requesting a list of needles. | 19th Dec 1940 | Box 123 \ 1 scan0068 | |
| Carburetion strategies for post-war cars, including induction pipes and a comparison of carburetter manufacturers. | 15th Nov 1940 | Box 123 \ 1 scan0069 | |
| Outlining a series of tests to investigate fuel economy related to intake heat (hot spot). | 15th Nov 1940 | Box 123 \ 1 scan0070 | |
| Calculation of engine volume displacement and gas velocity for different carburettor pipes. | 8th Jan 1941 | Box 123 \ 1 scan0071 | |
| Letter to Mr. Fisher concerning fuel economy with Stromberg carburetters and post-war programme considerations. | 8th Jan 1941 | Box 123 \ 1 scan0072 | |
| Follow-up letter regarding the availability and pricing of a 1938 Cadillac part for post-war production. | 8th Jan 1941 | Box 123 \ 1 scan0073 | |
| Article on carburation, suggesting observations on valve timing and a 6-cylinder induction system. | 20th Jan 1941 | Box 123 \ 1 scan0074 | |
| Letter from Solex Ltd. confirming the despatch of two 56 m/m carburettors to the Experimental Department. | 17th Feb 1941 | Box 123 \ 1 scan0075 | |
| Sourcing Kestrel X carburetters for experimental use, detailing failed enquiries and suggesting potential contacts. | 19th Feb 1941 | Box 123 \ 1 scan0076 | |
| Letter to Solex Carburetters Ltd. acknowledging the delivery of two 56m/m carburettors. | 20th Feb 1941 | Box 123 \ 1 scan0077 | |
| Carburetter and engine performance, focusing on issues with throttle bias and fuel distribution. | 27th Jan 1941 | Box 123 \ 1 scan0078 | |
| Notes on carburation, choke sizes, and throttle bias, with reference to an article by Louis Mantell. | 27th Jan 1941 | Box 123 \ 1 scan0079 | |
| Analysis of fuel mixture distribution under the effects of acceleration, engine mounting tilt, and induction pipe design. | 27th Jan 1941 | Box 123 \ 1 scan0080 | |
| Technical analysis of carburettor performance, modifications, and issues such as flat spots on various engine types. | 27th Jan 1941 | Box 123 \ 1 scan0081 | |
| Analysis of petrol consumption and throttle bias in relation to carburettor performance. | 27th Jan 1941 | Box 123 \ 1 scan0082 | |
| Letter to Zenith Carburetter Co. regarding Kestrel and Zenith 60 D.C.A. carburetters, discussing jets, delivery dates, and test bed programmes. | 4th Jul 1941 | Box 123 \ 1 scan0083 | |
| To Central Stores confirming the collection of two Zenith carburettors from Belper Station. | 11th Aug 1941 | Box 123 \ 1 scan0084 | |
| Letter to Solex Ltd. about the results of a check test on 56 mm carburetters. | 11th Sep 1941 | Box 123 \ 1 scan0085 | |
| Photograph of an engine bay showing a carburettor, flexible air intake hose, fuel pump and oil reservoir. | 11th Sep 1941 | Box 123 \ 1 scan0086 | |
| Photograph showing the right-hand side of a car engine and its components. | 24th Jun 1938 | Box 123 \ 1 scan0087 | |
| Letter to S. Smith & Sons regarding an air temperature problem and a thermostat for a Stromberg Carburetter. | 24th Jun 1938 | Box 123 \ 1 scan0088 | |
| Letter from S. Smith & Sons regarding their Automatic Jet Control for the S.U. Carburetter. | 27th May 1938 | Box 123 \ 1 scan0089 | |
| Letter from S. Smith & Sons regarding a HaDees Heater and enclosing a full description of a unit. | 27th May 1938 | Box 123 \ 1 scan0090 | |
| Letter to S. Smith & Sons regarding the trial of an automatic jet control for an S.U. Carburetter. | 3rd Jun 1938 | Box 123 \ 1 scan0091 | |
| Assembly drawing for a 70% Automatic Jet Control unit for Morris Motors. | 27th May 1938 | Box 123 \ 1 scan0092 | |
| Description of the Smith Automatic Jet Control for the S.U. Carburetter. | 27th May 1938 | Box 123 \ 1 scan0093 | |
| Page 2 of a document describing the operation of a device to manage engine mixture, specifically the Smith Automatic Jet Control for an S.U. Carburetter. | 7th Jun 1938 | Box 123 \ 1 scan0094 | |
| Letter from S. Smith & Sons regarding a loan of an Automatic Jet Control unit for testing with S.U. Carburetters. | 7th Jun 1938 | Box 123 \ 1 scan0095 | |
| Letter from S. Smith & Sons regarding Automatic Jet Control and Carburetter Temperature Control. | 20th Jun 1938 | Box 123 \ 1 scan0096 | |
| Letter from S. Smith & Sons regarding carburetter and thermostat design modifications. | 20th Jun 1938 | Box 123 \ 1 scan0097 | |
| Thermostatic air temperature control tests carried out by Weslake & Taylor Ltd. | 26th Aug 1936 | Box 123 \ 1 scan0098 | |
| Thermostatic air temperature control and its effect on carburettor engine performance. | 26th Aug 1936 | Box 123 \ 1 scan0099 | |
| Page of test bench results showing the effects of different air intake temperatures on engine power and fuel consumption. | 26th Aug 1936 | Box 123 \ 1 scan0100 | |
| The effects of air temperature on engine performance, including pinking, carburation, fuel consumption, and warming up. | 26th Aug 1936 | Box 123 \ 1 scan0101 | |
| Engine performance data comparing runs with and without an air heater, and a discussion on cold air intake design. | 26th Aug 1936 | Box 123 \ 1 scan0102 | |
| The effect of warm air on various carburetter types, with independent opinions from other manufacturers. | 17th Jun 1936 | Box 123 \ 1 scan0103 | |
| Title page for air flow tests of a combined temperature control and air cleaner unit. | 17th Jun 1936 | Box 123 \ 1 scan0104 | |
| Air flow tests of a combined temperature control and air cleaner for an S.U. carburetter. | 17th Jun 1936 | Box 123 \ 1 scan0105 | |
| Results of air flow tests on an instrument under various configurations to identify restrictions. | 17th Jun 1936 | Box 123 \ 1 scan0106 | |
| Series of tests on a thermostat, including lift, position, and airflow. | 17th Jun 1936 | Box 123 \ 1 scan0107 | |
| Series of tests on thermostat movement, positioning, and air intake components. | 13th Mar 1937 | Box 123 \ 1 scan0108 | |
| Assembly drawing for a combined temperature control, air cleaner, and silencer. | 13th Mar 1937 | Box 123 \ 1 scan0109 | |
| Letter from supplier S. Smith & Sons regarding a delay and a proposed alternative for an Automatic Jet Control component. | 21th Jul 1938 | Box 123 \ 1 scan0110 | |
| Letter to S. Smith & Sons agreeing to a thermostat arrangement for an experiment. | 2nd Aug 1938 | Box 123 \ 1 scan0111 | |
| Letter from S. Smith & Sons regarding the dispatch of an Automatic Jet Control unit on loan. | 4th Aug 1938 | Box 123 \ 1 scan0112 | |
| Letter to S. Smith & Sons regarding an Automatic jet control instrument for experiments. | 8th Aug 1938 | Box 123 \ 1 scan0113 | |
| Letter from S. Smith & Sons confirming the dispatch of a special miniature automatic jet control unit. | 10th Aug 1938 | Box 123 \ 1 scan0114 | |
| Letter from S. Smith & Sons regarding the dispatch and testing of a miniature Automatic Jet Control unit. | 13th Aug 1938 | Box 123 \ 1 scan0115 | |
| Follow-up letter from S. Smith & Sons regarding a sample Automatic Jet Control sent for testing. | 26th Aug 1938 | Box 123 \ 1 scan0116 | |
| Letter to S. Smith & Sons Ltd. regarding the testing of an automatic jet control and experiments on controlled air intake temperature. | 31th Aug 1938 | Box 123 \ 1 scan0117 | |
| The second page of a typed letter concluding a correspondence about ongoing experiments. | 31th Aug 1938 | Box 123 \ 1 scan0118 | |
| Letter from S. Smith & Sons regarding an Automatic Choke Control and automatic air intake. | 1st Sep 1938 | Box 123 \ 1 scan0119 | |
| Letter from S. Smith & Sons responding to tests on an experimental Carburetter Temperature Control Unit. | 6th Sep 1938 | Box 123 \ 1 scan0120 | |
| Letter from a supplier about a device designed to accurately meter heat to simulate road conditions during engine testing. | 6th Sep 1938 | Box 123 \ 1 scan0121 | |
| Letter to S. Smith & Sons Ltd. clarifying misunderstandings and detailing tests on a Temperature Control Unit for a 4¼ litre Bentley engine. | 7th Sep 1938 | Box 123 \ 1 scan0122 | |
| Letter detailing the method of testing a tuned resonance chamber air silencer. | 7th Sep 1938 | Box 123 \ 1 scan0123 | |
| Letter from S. Smith & Sons acknowledging correspondence from Mr. C.T. Salt, advising a further reply will be sent. | 9th Sep 1938 | Box 123 \ 1 scan0124 | |
| Letter to Messrs. S. Smith & Sons Ltd. reporting the failure of an Automatic Jet Control unit during road testing. | 3rd Oct 1938 | Box 123 \ 1 scan0125 | |
| Return of a failed automatic jet control unit to S. Smith & Sons Ltd. for inspection. | 3rd Oct 1938 | Box 123 \ 1 scan0126 | |
| Letter from S. Smith & Sons regarding the repair and despatch of a Smith's Automatic Jet Control unit. | 19th Oct 1938 | Box 123 \ 1 scan0127 | |
| Request to arrange payment for one complete type DBV.42 throttle body for testing purposes on the Wraith (52439). | 21th Oct 1938 | Box 123 \ 1 scan0128 | |
| Letter from S. Smith & Sons regarding an instrument's performance at different air temperatures and its installation. | 24th Oct 1938 | Box 123 \ 1 scan0129 | |
| Letter from S. Smith & Sons regarding testing an Air Temperature Control device. | 24th Oct 1938 | Box 123 \ 1 scan0130 | |
| Letter from S. Smith & Sons regarding a damaged rolling rubber gland ring on a small Automatic Jet Control unit. | 31th Oct 1938 | Box 123 \ 1 scan0131 | |
| Letter to S. Smith & Sons Ltd. requesting a quote for an Automatic Jet control instrument in quantity. | 4th Jan 1939 | Box 123 \ 1 scan0132 | |
| Quotation from S. Smith & Sons for 500 Automatic Jet Control units, discussing component options. | 5th Jan 1939 | Box 123 \ 1 scan0133 | |
| Letter to S. Smith & Sons Ltd. about a thermostat unit and a request for a meeting in Derby. | 7th Jan 1939 | Box 123 \ 1 scan0134 | |
| Letter from S. Smith & Sons chasing the receipt of an Automatic Jet Control, code X.29963. | 11th Feb 1939 | Box 123 \ 1 scan0135 | |
| Letter to Messrs. S. Smith & Sons Ltd. arranging a visit to Derby. | 12th Jan 1939 | Box 123 \ 1 scan0136 | |
| Letter from S. Smith & Sons regarding an order for HaDees Heaters and a telephone conversation. | 12th Jan 1939 | Box 123 \ 1 scan0137 | |
| Letter from S. Smith & Sons arranging a visit to discuss a previous letter. | 16th Jan 1939 | Box 123 \ 1 scan0138 | |
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