| Description | Date | Identifier | |
| Letter from Stromberg Motor Devices Ltd. regarding the testing of a Stromberg Carburetor and previous correspondence. | 16th Jan 1929 | Box 122 \ 1 scan0040 | |
| Meeting with the Stromberg Carburetter Company regarding the suitability of their products for cars and aero engines. | 17th Jan 1929 | Box 122 \ 1 scan0041 | |
| Requesting details and instructions for a 'Japan' induction pipe to test a single Stromberg carburettor. | 29th Nov 1929 | Box 122 \ 1 scan0042 | |
| Letter to The Zenith Carburetter Co. Ltd. accepting an offer to inspect two twin carburetter models. | 21th Jan 1930 | Box 122 \ 1 scan0043 | |
| Letter from The Zenith Carburetter Co. Ltd. regarding vertical twin carburetter specifications and samples. | 20th Jan 1930 | Box 122 \ 1 scan0044 | |
| Concluding page of a letter from The Zenith Carburetter Co. awaiting a report. | 20th Jan 1930 | Box 122 \ 1 scan0045 | |
| Letter from Zenith Carburetter Co. Ltd. regarding sending two twin carburetter samples for examination. | 28th Jan 1930 | Box 122 \ 1 scan0046 | |
| Request for drawings and instructions to fit a twin-choke Zenith carburetter to a 20 HP 'Japan' engine. | 30th Jan 1930 | Box 122 \ 1 scan0047 | |
| Letter from Zenith Carburetter Co. Ltd. regarding two sample twin carburettors. | 16th Feb 1930 | Box 122 \ 1 scan0048 | |
| Letter to the Zenith Carburetter Co. Ltd. regarding the supply and testing of carburettors for an engine. | 7th Feb 1930 | Box 122 \ 1 scan0049 | |
| Letter from Zenith Carburetter Co. Ltd. regarding a custom pipe for a 105 D.C. Carburetter and arranging a visit from an expert. | 10th Feb 1930 | Box 122 \ 1 scan0050 | |
| Letter from Zenith Carburetter Co. Ltd. regarding a follow-up visit to adjust a sample carburetter. | 16th Mar 1930 | Box 122 \ 1 scan0051 | |
| Letter to Zenith Carburetter Co. Ltd. regarding the testing of an induction system and returning unsuitable carburetter samples. | 13th Mar 1930 | Box 122 \ 1 scan0052 | |
| Request to purchase a twin choke Zenith carburettor for a 20/25 HP engine. | 13th Mar 1930 | Box 122 \ 1 scan0053 | |
| Letter from the Zenith Carburetter Co. Ltd. regarding the preparation of a 105 D.C. carburetter for an engine test. | 14th Mar 1930 | Box 122 \ 1 scan0054 | |
| Summary of tests comparing twin Solex carburettors to standard ones on a Phantom II vehicle. | 24th Apr 1930 | Box 122 \ 1 scan0055 | |
| Suggested programme for 20 HP twin carburettor tests. | 24th Apr 1930 | Box 122 \ 1 scan0056 | |
| Returning incorrect jets for Zenith Twin Type American Carburetters as they do not fit. | 8th May 1930 | Box 122 \ 1 scan0057 | |
| Twin carburettor tests and camshaft comparisons on the 'Japan' engine. | 23th May 1930 | Box 122 \ 1 scan0058 | |
| Induction system tests, comparing riser pipe lengths, bore diameters, choke sizes, and the effectiveness of a 'hot spot' system. | 23th May 1930 | Box 122 \ 1 scan0059 | |
| Engine performance, comparing results from tests with different camshaft durations (110°, 112°, 116°) and carburetter setups. | 23th May 1930 | Box 122 \ 1 scan0060 | |
| Summary of experiments on the 'Japan' engine, detailing results for twin carburetters, camshafts, induction systems, and throttle response. | 23th May 1930 | Box 122 \ 1 scan0061 | |
| Table showing actual valve timings taken from an engine during twin carburettor tests on 'Japan'. | 27th May 1930 | Box 122 \ 1 scan0062 | |
| Performance graph comparing large and small bore induction manifolds on a 'Japan' engine with twin Zenith carburettors. | 21th May 1930 | Box 122 \ 1 scan0063 | |
| Performance graph comparing different camshaft configurations on a 'Japan' engine, plotting Brake Horsepower and Brake Mean Effective Pressure against engine RPM. | 21th May 1930 | Box 122 \ 1 scan0064 | |
| Performance graph comparing Twin Zenith and Standard Chassis carburetters with various camshafts. | 22th May 1930 | Box 122 \ 1 scan0065 | |
| Blueprint detailing the arrangement of a twin Zenith carburettor and induction pipe on a Japan engine. | 27th May 1930 | Box 122 \ 1 scan0066 | |
| Road test comparison of Twin Zenith and Solex carburetters on a 'Japan' engine with recommendations for future design. | 11th Jun 1930 | Box 122 \ 1 scan0067 | |
| Technical discussion comparing emulsion type diffusers in carburettors with plain tube jets for optimal engine performance. | 11th Aug 1921 | Box 122 \ 1 scan0068 | |
| Carburettor performance, fuel consumption, and ongoing road tests on Zenith and Stromberg models. | 11th Jun 1930 | Box 122 \ 1 scan0069 | |
| Diagrammatic sketch of a Stutz-Zenith carburettor. | 7th Jun 1930 | Box 122 \ 1 scan0070 | |
| Considering the function and characteristics of accelerating pumps for car carburetters, with reference to a Stromberg aircraft model. | 11th Jun 1930 | Box 122 \ 1 scan0071 | |
| Carburettor performance, comparing Stromberg, Zenith, and Claudel models, particularly regarding accelerating pumps. | 1st Jul 1930 | Box 122 \ 1 scan0072 | |
| Request for a patent search regarding the Stromberg carburetter's accelerating petrol pump. | 1st Jul 1930 | Box 122 \ 1 scan0073 | |
| Test drive report on a 25 HP car fitted with a double Zenith carburetter. | 19th Jul 1930 | Box 122 \ 1 scan0074 | |
| Letter from Stromberg Motor Devices Ltd. clarifying their non-involvement with the Chambers or E.T.C. Carburetor. | 14th Jul 1930 | Box 122 \ 1 scan0075 | |
| Letter from Stromberg Motor Devices Ltd requesting the return of carburetter parts supplied for testing. | 3rd Sep 1930 | Box 122 \ 1 scan0076 | |
| Letter to The Zenith Carburetter Co. regarding noise issues and potential modifications for a 105.DC twin carburetter. | 22th Apr 1931 | Box 122 \ 1 scan0077 | |
| Typed letter discussing a job, ordering a model 105.DC, and arranging a representative's visit. | 22th Apr 1931 | Box 122 \ 1 scan0078 | |
| The order of a Zenith 105.DC twin pump carburetter for a 25HP model. | 22th Apr 1931 | Box 122 \ 1 scan0079 | |
| Letter from Zenith Carburetter Co. Ltd. arranging a meeting to discuss their 105 D.C. twin carburetter. | 23th Apr 1931 | Box 122 \ 1 scan0080 | |
| Letter to The Zenith Carburetter Co. Ltd. arranging a meeting with their representative. | 24th Apr 1931 | Box 122 \ 1 scan0081 | |
| Telegram from Roycar requesting a selection of idling compensators to be brought. | 27th Apr 1931 | Box 122 \ 1 scan0082 | |
| Letter from Zenith Carburetter Co. Ltd. discussing carburetter models, testing and supply. | 29th Apr 1931 | Box 122 \ 1 scan0083 | |
| Letter from Zenith Carburetter Co. regarding fitting carburettors to a 6-cylinder engine. | 29th Apr 1931 | Box 122 \ 1 scan0084 | |
| Confirming the substitution of a Zenith carburetter model from Type 105 to 36 DU on an order. | 1st May 1931 | Box 122 \ 1 scan0085 | |
| Letter to the Zenith Carburetter Co. regarding the fitting of downdraught carburettors and induction manifold design. | 4th May 1931 | Box 122 \ 1 scan0086 | |
| Letter from Zenith Carburetter Co. Ltd. regarding the design and testing of their inverted carburettors for a 20 HP six-cylinder engine. | 7th May 1931 | Box 122 \ 1 scan0087 | |
| Letter from The Zenith Carburetter Co. regarding modifications to a carburetter pipe. | 7th May 1931 | Box 122 \ 1 scan0088 | |
| Report comparing a Zenith carburettor's float chamber design and performance against a twin float model, focusing on flooding during cornering. | 7th May 1931 | Box 122 \ 1 scan0089 | |
| Carburettor flooding, accelerating pumps, and future development for supercharged aero engines. | 7th May 1931 | Box 122 \ 1 scan0090 | |
| Notification regarding the change of address for Stromberg Motor Devices Ltd. | 21th May 1931 | Box 122 \ 1 scan0091 | |
| Request to detail the induction pipe for a Zenith 36 D.U.P. twin choke carburetter on a 25 HP engine. | 8th May 1931 | Box 122 \ 1 scan0092 | |
| Confirming the despatch of a Zenith Triple Diffuser carburetter to Mr. Elliot. | 11th May 1931 | Box 122 \ 1 scan0093 | |
| Dimensions of a Zenith carburetter and the despatch of a horizontal Triple Diffuser Zenith carburetter. | 11th May 1931 | Box 122 \ 1 scan0094 | |
| Letter from Zenith Carburetter Co. Ltd. concerning a suggested layout for an induction pipe on a 20 HP six-cylinder engine. | 12th May 1931 | Box 122 \ 1 scan0095 | |
| Selection and return of carburetter parts supplied by the Zenith Carburetter Co. | 12th May 1931 | Box 122 \ 1 scan0096 | |
| Slow running schemes and experiments conducted on twin choke carburettors. | 15th May 1931 | Box 122 \ 1 scan0097 | |
| Technical report on carburetter performance, detailing issues with idling mixture, metering, and proposed modifications. | 15th May 1931 | Box 122 \ 1 scan0098 | |
| Description of the Zenith slow running scheme and accelerator pump for a double choke carburetter (36 D.U.P.). | 15th May 1931 | Box 122 \ 1 scan0099 | |
| Technical description of carburettor components including the piston, accelerator pump, slow running unit, and Zenith float. | 15th May 1931 | Box 122 \ 1 scan0100 | |
| Diagram showing the mechanism of a Phantom II Twin Choke Carburettor. | 15th May 1931 | Box 122 \ 1 scan0101 | |
| Blueprint showing a modification for slow running on Phantom II twin-choke carburettors. | 15th May 1931 | Box 122 \ 1 scan0102 | |
| Schematic diagram of a Zenith carburettor's slow running system. | 14th May 1931 | Box 122 \ 1 scan0103 | |
| Letter to Zenith Carburetter Co. regarding a trial scheme for 36 V.I. carburetters and a double carburetter induction pipe. | 18th May 1931 | Box 122 \ 1 scan0104 | |
| Scheme for an induction pipe to fit two separate Zenith carburettors to a 25 HP engine. | 20th May 1931 | Box 122 \ 1 scan0105 | |
| The purchase of two 36.V.I. carburettors for a 25 HP model. | 20th May 1931 | Box 122 \ 1 scan0106 | |
| Providing details of an air silencer suitable for twin Zenith carburetters. | 20th May 1931 | Box 122 \ 1 scan0107 | |
| Letter to the Zenith Carburetter Co. requesting a diagram and confirming details of a 36 D.U.P. carburetter. | 20th May 1931 | Box 122 \ 1 scan0108 | |
| Request to The Zenith Carburetter Co. for descriptive material on two downdraught carburetters. | 22th May 1931 | Box 122 \ 1 scan0109 | |
| Letter from Zenith Carburetter discussing the features of the 36 D.U.P. carburetter model. | 26th May 1931 | Box 122 \ 1 scan0110 | |
| Letter from the Zenith Carburetter Co. describing a specific carburetter's construction. | 26th May 1931 | Box 122 \ 1 scan0111 | |
| Letter from Zenith Carburetter Co. Ltd. regarding the availability of printed matter for a down-draft carburettor. | 27th May 1931 | Box 122 \ 1 scan0112 | |
| Instructions for dismantling and cleaning the downdraught Zenith carburetter type VI. | 27th May 1931 | Box 122 \ 1 scan0113 | |
| Page 2 of instructions for Zenith carburetter adjustment and disassembly. | 29th May 1931 | Box 122 \ 1 scan0114 | |
| Letter to the Zenith Carburetter Co. querying the suitability of a 36 D.U.P. carburetter for a 3 1/4 litre engine. | 29th May 1931 | Box 122 \ 1 scan0115 | |
| Blueprint of an adapter for an air silencer for a twin choke Zenith carburettor. | 20th May 1931 | Box 122 \ 1 scan0116 | |
| Letter from Zenith Carburetter Co. Ltd. advising on the correct carburetter and choke size for a 3½ litre engine. | 1st Jun 1931 | Box 122 \ 1 scan0117 | |
| Letter from The Zenith Carburetter Co. regarding choke sizes and the suitability of a 36 twin carburetter. | 1st Jun 1931 | Box 122 \ 1 scan0118 | |
| Requesting the insertion of air passages into an air silencer for a Zenith twin carburetter as a preliminary experiment. | 8th Jun 1931 | Box 122 \ 1 scan0119 | |
| Hand-drawn diagram with dimensions for an air silencer for a twin-choke Zenith carburetter. | 25th Jun 1931 | Box 122 \ 1 scan0120 | |
| Letter to The Zenith Carburetter Co. requesting missing chokes and jets for two carburettors. | 25th Jun 1931 | Box 122 \ 1 scan0121 | |
| Letter from The Zenith Carburetter Co. Ltd. regarding a supply of carburetter parts. | 26th Jun 1931 | Box 122 \ 1 scan0122 | |
| Letter to Zenith Carburetter Co. Ltd. discussing issues with a 36 DUP carburetter and the promise of the 36 V1 model. | 29th Jun 1931 | Box 122 \ 1 scan0123 | |
| Invoice from Zenith Carburetter Co. for Type 36 V.I. Carburetter parts. | 30th Jun 1931 | Box 122 \ 1 scan0124 | |
| Letter from Zenith Carburetter Co. Ltd. discussing fitting downdraft carburetters to 20/25 HP engines. | 1st Jul 1931 | Box 122 \ 1 scan0125 | |
| Letter from Zenith Carburetter Co. regarding modifications to the carburetter hot spot. | 1st Jul 1931 | Box 122 \ 1 scan0126 | |
| Schematic showing the outside view and overall dimensions of a Zenith 42 VI carburetter. | 26th Feb 1931 | Box 122 \ 1 scan0127 | |
| Blueprint for a suggested induction pipe for a 20-25 HP engine, created by The Zenith Carburetter Co Ltd. | 22th May 1931 | Box 122 \ 1 scan0128 | |
| The supply of various jet and choke tube parts for two type 36 Vl carburettors for testing purposes. | 2nd Jul 1931 | Box 122 \ 1 scan0129 | |
| Letter from Zenith Carburetter Co. Ltd. regarding the progress of down-draft carburettor tests. | 4th Aug 1931 | Box 122 \ 1 scan0130 | |
| Letter to Zenith Carburetter Co. Ltd. regarding the status of carburetter testing. | 15th Aug 1931 | Box 122 \ 1 scan0131 | |
| Unresolved invoice for carburettor parts under testing from Zenith Carburetter Co. Ltd. | 21th Sep 1931 | Box 122 \ 1 scan0132 | |
| The return of parts to the Zenith Carburetter Co. | 22th Sep 1931 | Box 122 \ 1 scan0133 | |
| Letter from Zenith Carburetter Co. Ltd. regarding tests on a down-draught carburetter. | 26th Oct 1931 | Box 122 \ 1 scan0134 | |
| Letter to Zenith Carburetter Co. Ltd. regarding the discontinuation of tests on down-draught carburetters due to safety concerns from Sir Henry Royce. | 29th Oct 1931 | Box 122 \ 1 scan0135 | |
| Letter from Zenith Carburetter Co. Ltd. discussing downdraft carburettors and new aeroplane carburettors. | 31th Oct 1931 | Box 122 \ 1 scan0136 | |
| Page 2 of a letter from The Zenith Carburetter Co. arranging a representative's visit. | 30th Oct 1931 | Box 122 \ 1 scan0137 | |
| Letter from Bendix-Perrot Brakes Ltd. discussing comparative carburetor performance and enclosing mixture ratio curves. | 13th Sep 1932 | Box 122 \ 1 scan0138 | |
| Letter from Bendix-Perrot Brakes Ltd. discussing carburettor mixture curves and the Stromberg Carburetor. | 13th Sep 1932 | Box 122 \ 1 scan0139 | |
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