| Description | Date | Identifier | |
| Letter to The S.U. Company regarding the design and testing of carburetters and petrol pumps. | 4th Feb 1933 | Box 31 \ 5 Scan014 | |
| Internal order request for two 1 5/8 inch diameter S.U. throttle carburettors. | 7th Feb 1933 | Box 31 \ 5 Scan015 | |
| Letter to The S.U. Company regarding seizure issues with brass carburettor throttle spindles, recommending a switch to steel. | 10th Feb 1933 | Box 31 \ 5 Scan016 | |
| Letter from The S.U. Company regarding the supply of carburettor spindles. | 11th Feb 1933 | Box 31 \ 5 Scan017 | |
| Letter to the S.U. Company regarding carburettor bore sizes and a request for three carburettors. | 15th Feb 1933 | Box 31 \ 5 Scan018 | |
| Drawing of an induction pipe for three carburettors. | 15th Feb 1933 | Box 31 \ 5 Scan019 | |
| Stamped document from the Print Room in Derby. | 15th Feb 1933 | Box 31 \ 5 Scan020 | |
| Letter from The S.U. Company correcting the number of carburettors required and discussing induction pipe diameter. | 16th Feb 1933 | Box 31 \ 5 Scan021 | |
| Letter from S. Smith & Sons regarding a model of an automatic jet control with metallic bellows. | 28th Feb 1933 | Box 31 \ 5 Scan022 | |
| Issue with automatic jet control parts for S.U. carburetters and arranging for a new set from Smiths. | 2nd Mar 1933 | Box 31 \ 5 Scan023 | |
| Letter to S. Smith & Sons regarding the dimensions of bellows for an automatic jet control. | 2nd Mar 1933 | Box 31 \ 5 Scan024 | |
| Letter from S. Smith & Sons regarding a Blue Print for an Automatic Jet Control. | 3rd Mar 1933 | Box 31 \ 5 Scan025 | |
| Letter from S. Smith & Sons (Motor Accessories) Ltd chasing the return of an Automatic Jet Control unit on loan. | 13th Mar 1933 | Box 31 \ 5 Scan026 | |
| Letter from S. Smith & Sons confirming the dispatch of an Automatic Jet Control for testing. | 14th Mar 1933 | Box 31 \ 5 Scan027 | |
| Letter to S. Smith & Sons disputing a charge for experimental work on an S.U. Carburetter automatic jet control. | 14th Mar 1933 | Box 31 \ 5 Scan028 | |
| Test report on S.U. carburettors for a 19-G-IV chassis, including modifications to an induction pipe balance piece. | 16th Mar 1933 | Box 31 \ 5 Scan029 | |
| Testing various induction pipes and balance pieces to reduce noise and improve engine performance. | 17th Mar 1933 | Box 31 \ 5 Scan030 | |
| Letter to the S.U. Company regarding the testing of their carburettors and a request for a smaller size. | 17th Mar 1933 | Box 31 \ 5 Scan031 | |
| Performance graph for twin 3/8 inch S.U. carburettors on a Peregrine II No. 5 Unit engine. | 18th Mar 1933 | Box 31 \ 5 Scan032 | |
| Severely faded and almost entirely illegible typed document, likely a carbon copy, with a clear date stamp. | 18th Mar 1933 | Box 31 \ 5 Scan033 | |
| Preliminary tests on twin S.U. carburetters for the Peregrine engine. | 20th Mar 1933 | Box 31 \ 5 Scan034 | |
| Follow-up letter from Electric Heating & Hardware Ltd. regarding a patented serrated needle for S.U. Carburetters. | 20th Mar 1933 | Box 31 \ 5 Scan035 | |
| Apology letter from S. Smith & Sons regarding a loan account misunderstanding and the supply of a replacement Jet Control unit. | 21th Mar 1933 | Box 31 \ 5 Scan036 | |
| Letter to Messrs S. Smith & Sons concerning the return of a thermostat jet control. | 27th Mar 1933 | Box 31 \ 5 Scan037 | |
| Letter to Electric Heating & Hardware Ltd declining to proceed with a job for serrated needles. | 29th Mar 1933 | Box 31 \ 5 Scan038 | |
| Letter to The S.U. Company concerning the supply and development of carburetters. | 31th Mar 1933 | Box 31 \ 5 Scan039 | |
| Letter from S. Smith & Sons regarding proposed tests for an automatic jet control system. | 3rd Apr 1933 | Box 31 \ 5 Scan040 | |
| Letter to The S.U. Company returning incorrectly sized carburetters and requesting a supply of No.6 needles. | 5th Apr 1933 | Box 31 \ 5 Scan041 | |
| Diagram and explanation of an S.U. petrol pump failure due to a broken fibre disc. | 6th Apr 1933 | Box 31 \ 5 Scan042 | |
| Letter from The S.U. Company regarding H.V.3 carburetters and the sending of No.6 needles. | 6th Apr 1933 | Box 31 \ 5 Scan043 | |
| The dispatch of a pair of S.U. carburettors and throttle couplings back to the S.U. Co. | 6th Apr 1933 | Box 31 \ 5 Scan044 | |
| Letter from The S.U. Company regarding the specification and delivery of carburetters. | 8th Apr 1933 | Box 31 \ 5 Scan045 | |
| Confirming that aluminium parts for Bensport S.U. Carburetters requiring a scratch brush finish must be made from RR. alloy. | 10th Apr 1933 | Box 31 \ 5 Scan046 | |
| Finishing of a casting for S.U. Carburetters and timing the required operation. | 10th Apr 1933 | Box 31 \ 5 Scan047 | |
| Letter to S. Smith & Sons Ltd regarding the fitting of an experimental car with an Automatic Jet Control. | 11th Apr 1933 | Box 31 \ 5 Scan048 | |
| Letter from S. Smith & Sons (Motor Accessories) Ltd regarding Automatic Jet Control. | 12th Apr 1933 | Box 31 \ 5 Scan049 | |
| Letter from The S.U. Company regarding a request for drawings for two sample instruments for Bentley Carburetters. | 24th Apr 1933 | Box 31 \ 5 Scan050 | |
| Bentley carburation, comparing different induction pipe designs and the effects of an intake silencer. | 2nd May 1933 | Box 31 \ 5 Scan051 | |
| Weakest maintained consumption test results for 2 S.U. Carburetters. | 2nd May 1933 | Box 31 \ 5 Scan052 | |
| Graph comparing engine performance (B.HP vs R.P.M.) with different induction pipe configurations. | 28th Apr 1933 | Box 31 \ 5 Scan053 | |
| Stamped document from the Print Room in Derby. | 1st May 1933 | Box 31 \ 5 Scan054 | |
| Internal order request for one pair of Bentley carburettors from the S.U. Company. | 3rd May 1933 | Box 31 \ 5 Scan055 | |
| Letter to The S.U. Company regarding an order for a pair of Bentley carburetters. | 3rd May 1933 | Box 31 \ 5 Scan056 | |
| Letter from The S.U. Company regarding the return and refitting of experimental flat valves. | 25th May 1933 | Box 31 \ 5 Scan057 | |
| Letter to the S.U. Carburetter Co. regarding the return of unsatisfactory experimental flat valves. | 31th May 1933 | Box 31 \ 5 Scan058 | |
| Return of two flat valve acetate discs to the S.U. Carburetter Co. | 31th May 1933 | Box 31 \ 5 Scan059 | |
| Letter to The S.U. Company regarding component specifications and scheduling work on carburetters. | 14th Jun 1933 | Box 31 \ 5 Scan060 | |
| Letter from The S.U. Company regarding washers, a project delay due to Le Mans, and difficulties with new carburetters. | 15th Jun 1933 | Box 31 \ 5 Scan061 | |
| Letter to The S.U. Company regarding carburetter needle valve restrictions and potential solutions for the Bentley car. | 15th Jun 1933 | Box 31 \ 5 Scan062 | |
| Graph plotting the delivery performance in Pints per Hour against Pump RPM for a Bensport No. 4 Petrol Pump under various test conditions. | 7th Jun 1933 | Box 31 \ 5 Scan063 | |
| Blank page with a Print Room date stamp from the Derby factory. | 15th Jun 1933 | Box 31 \ 5 Scan064 | |
| Letter to The S.U. Company regarding blueprints and specifications for a suction chamber and cap. | 21th Jun 1933 | Box 31 \ 5 Scan065 | |
| Letter from The S.U. Company regarding the supply of float chamber seatings and a suction chamber cap. | 19th Jun 1933 | Box 31 \ 5 Scan066 | |
| Blueprint for a Suction Chamber HV4 for Bentsport, to be made from an aluminium diecasting. | 16th May 1933 | Box 31 \ 5 Scan067 | |
| Blueprint for a suction chamber cap, made of brass with a dull nickel finish. | 24th Jun 1933 | Box 31 \ 5 Scan068 | |
| Letter to the S.U. Company regarding issues with their petrol pumps and carburation adjustments during testing. | 24th Jun 1933 | Box 31 \ 5 Scan069 | |
| Confirmation of a loan of S.U. Carburetters for testing the first 3 1/2 Litre Bentley Engine. | 26th Jun 1933 | Box 31 \ 5 Scan070 | |
| Letter from The S.U. Company to confirm a visit from Mr. Von de Becke. | 5th Jul 1933 | Box 31 \ 5 Scan071 | |
| Bensport petrol pump tests including modifications to S.U. carburetter float chamber covers. | 15th Jul 1933 | Box 31 \ 5 Scan072 | |
| Petrol pump delivery tests with various modifications to float chamber and needle seats. | 15th Jul 1933 | Box 31 \ 5 Scan073 | |
| Adjustments to a needle valve and seat to reduce restriction. | 15th Jul 1933 | Box 31 \ 5 Scan074 | |
| Diagram illustrating modifications to an S.U. float chamber cover for Bensport petrol pump tests. | 18th Jul 1933 | Box 31 \ 5 Scan075 | |
| Stamp from the Print Room in Derby, indicating the date of processing. | 20th Jul 1933 | Box 31 \ 5 Scan076 | |
| Letter to The S.U. Company regarding carburation tests and needle design for a 3.6 litre Bentley. | 20th Jul 1933 | Box 31 \ 5 Scan077 | |
| Comparison of numerical data for 'RRA' and 'EXP. NEEDLE'. | 20th Jul 1933 | Box 31 \ 5 Scan078 | |
| Data table comparing different S.U. carburettor needles for Bentley vehicles. | 15th Jul 1933 | Box 31 \ 5 Scan079 | |
| Data table and graph for 'BEN SPORT' SU HV3 piston recess testing. | 15th Jul 1933 | Box 31 \ 5 Scan080 | |
| Issues of slack in S.U. carburettor controls and confirming the location of the mixture control lever. | 20th Jul 1933 | Box 31 \ 5 Scan081 | |
| Lost movement in S.U. jet controls, recommending specific dimensions and materials for pins to reduce slackness. | 21th Jul 1933 | Box 31 \ 5 Scan082 | |
| Letter to the S.U. Company regarding backlash issues in carburetter mixture controls. | 22th Jul 1933 | Box 31 \ 5 Scan083 | |
| Letter from The S.U. Company regarding a justified complaint about carburetter pins. | 24th Jul 1933 | Box 31 \ 5 Scan084 | |
| Internal request to place an order for 2 dozen type RR.X carburetter needles from The S.U. Company. | 27th Jul 1933 | Box 31 \ 5 Scan085 | |
| Comparison test report for S.U. carburettor needles, type RR.X versus RR.A. | 27th Jul 1933 | Box 31 \ 5 Scan086 | |
| Letter to The S.U. Company requesting a further supply of needles following successful trials. | 27th Jul 1933 | Box 31 \ 5 Scan087 | |
| Test report on modifications to S.U. carburetter float chamber covers and needle seats. | 27th Jul 1933 | Box 31 \ 5 Scan088 | |
| Testing different pressure springs in pumps and the resulting delivery differences and flow restrictions. | 27th Jul 1933 | Box 31 \ 5 Scan089 | |
| Letter from The S.U. Company confirming the dispatch of 2 dozen RR.X needles. | 28th Jul 1933 | Box 31 \ 5 Scan090 | |
| Modifications to the float chamber needle and seating for Bentley S.U. Carburetters. | 29th Jul 1933 | Box 31 \ 5 Scan091 | |
| Confirming the dispatch of four pairs of needles for Bentley Carburation. | 1st Aug 1933 | Box 31 \ 5 Scan092 | |
| Letter to the S.U. Company detailing the stove enamelling process for Bentley carburettors. | 3rd Aug 1933 | Box 31 \ 5 Scan093 | |
| Troubles with Bentley petrol pumps, including vapour lock and carburation issues. | 3rd Aug 1933 | Box 31 \ 5 Scan094 | |
| Performance graph showing fuel consumption versus engine speed for a Bentley engine under different carburetion settings. | 31th Jul 1933 | Box 31 \ 5 Scan095 | |
| Stamped document from the Print Room in Derby. | 3rd Aug 1933 | Box 31 \ 5 Scan096 | |
| Enamelling process and materials for S.U. Carburetters. | 8th Aug 1933 | Box 31 \ 5 Scan097 | |
| Letter to the S.U. Carburetter Co. about carburettor finish and an investigation into petrol pumps on the continent, specifically the Autflux model, to avoid vapour lock. | 22th Aug 1933 | Box 31 \ 5 Scan098 | |
| Pump delivery spring strength, pressure settings, and positioning to avoid vapour lock. | 29th Aug 1933 | Box 31 \ 5 Scan099 | |
| Letter from The S.U. Company discussing the supply and stove enamelled finish of Bentley carburettors. | 29th Aug 1933 | Box 31 \ 5 Scan100 | |
| Article describing a 'Robot Strangler Control', an automatic device for regulating the fuel mixture when the engine is cold. | 2nd May 1933 | Box 31 \ 5 Scan101 | |
| Letter to The S.U. Company regarding the finish on a pair of stove enamelled carburettors. | 2nd Sep 1933 | Box 31 \ 5 Scan102 | |
| Request to the Order Office for a replacement float for a 1 5/8' S.U. carburetter. | 5th Sep 1933 | Box 31 \ 5 Scan103 | |
| Letter from The S.U. Company regarding the finish on a carburetter and instructions for a float chamber part. | 5th Sep 1933 | Box 31 \ 5 Scan104 | |
| Letter from The S.U. Company regarding samples of dull plate holding-up bolts for the Experimental Department. | 7th Sep 1933 | Box 31 \ 5 Scan105 | |
| Letter to the S.U. Company discussing the preferred finish for Bentley carburetter parts. | 8th Sep 1933 | Box 31 \ 5 Scan106 | |
| Page 2 of a letter to The S.U. Company discussing production alternatives. | 11th Sep 1933 | Box 31 \ 5 Scan107 | |
| Letter from The S.U. Company regarding the finish of Bentley Carburetters. | 11th Sep 1933 | Box 31 \ 5 Scan108 | |
| Modifications and road tests of a 1 1/2' S.U. carburetter to improve slow running. | 5th Oct 1933 | Box 31 \ 5 Scan109 | |
| Blueprint detailing modifications to a 1 5/8 S.U. carburettor piston. | 7th Oct 1933 | Box 31 \ 5 Scan110 | |
| Blueprint diagram of a 1 5/8 S.U. carburetter. | 5th Oct 1933 | Box 31 \ 5 Scan111 | |
| Blank document page with a 'PRINT ROOM' reception stamp. | 5th Oct 1933 | Box 31 \ 5 Scan112 | |
| Modifications to two 1 3/8' S.U. carburettors for Bentley carburation. | 6th Oct 1933 | Box 31 \ 5 Scan113 | |
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