| Description | Date | Identifier | |
| Letter from the S.U. Company discussing carburettor design, specifically the use of a separate jet for slow running. | 24th Aug 1931 | Box 31 \ 4 Scan068 | |
| Letter from The S.U. Company discussing engine tick-over, noise, and mixture strength. | 24th Aug 1931 | Box 31 \ 4 Scan069 | |
| Letter from the S.U. Company discussing carburetter over-enrichment issues during cold engine idling and potential solutions. | 27th Aug 1931 | Box 31 \ 4 Scan070 | |
| Letter from The S.U. Company regarding a sketch for a pipe to be used with an air cleaner or hot air supply for their carburetter. | 27th Aug 1931 | Box 31 \ 4 Scan071 | |
| Petrol consumption test results for S.U. and R.R. carburettors with handwritten notes for further testing. | 28th Aug 1931 | Box 31 \ 4 Scan072 | |
| Test report comparing an S.U. carburetter against a standard R.R. model, detailing road performance, fuel consumption, and piston positions. | 4th Sep 1931 | Box 31 \ 4 Scan073 | |
| Test report on a Solex carburetter, evaluating its performance against an S.U. carburetter. | 4th Sep 1931 | Box 31 \ 4 Scan074 | |
| Blueprint drawing of the controls for an S.U. Carburetter. | 10th Sep 1931 | Box 31 \ 4 Scan075 | |
| The rear of a document showing a purple date stamp. | 10th Sep 1931 | Box 31 \ 4 Scan076 | |
| Graph showing full throttle metering for a large S.U. carburettor with different needles. | 10th Sep 1931 | Box 31 \ 4 Scan077 | |
| Graph showing full throttle metering for a C.S. unit 110° camshaft with a short type Ph.II silencing system. | 16th Sep 1931 | Box 31 \ 4 Scan078 | |
| Heavily faded document with a purple 'Patents Derby' date stamp. | 16th Sep 1931 | Box 31 \ 4 Scan079 | |
| Letter to The S.U. Carburetter Co. discussing carburetter noise and performance improvements. | 31th Aug 1931 | Box 31 \ 4 Scan080 | |
| Letter to the S.U. Carburetter Co. regarding altering mixture strength by spring loading the piston. | 31th Aug 1931 | Box 31 \ 4 Scan081 | |
| Blueprint for a suggested air cleaner pipe for a carburettor air intake. | 27th Aug 1931 | Box 31 \ 4 Scan082 | |
| Letter from The S.U. Company discussing carburetter noise issues and potential solutions. | 1st Sep 1931 | Box 31 \ 4 Scan083 | |
| Letter to the S.U. Carburetter Co. regarding weakness issues with the H.V.5 type carburetter upon acceleration. | 10th Sep 1931 | Box 31 \ 4 Scan084 | |
| Page two of a letter discussing piston performance, weight and enquiring about a larger S.U. carburettor. | 10th Sep 1931 | Box 31 \ 4 Scan085 | |
| Graph of full throttle metering for an SU HVS Carburettor with 1 5/8 throttle. | 11th Sep 1931 | Box 31 \ 4 Scan086 | |
| Cover sheet with faint illegible handwritten text and a purple 'Print Room' date stamp. | 11th Sep 1931 | Box 31 \ 4 Scan087 | |
| Letter from The S.U. Company regarding the supply of carburetter needles and a carburetter. | 14th Sep 1931 | Box 31 \ 4 Scan088 | |
| Letter to The S.U. Company regarding the testing of carburettors and needles for a 7.5 litre model and a 25 HP model. | 21th Sep 1931 | Box 31 \ 4 Scan089 | |
| Letter from The S.U. Company quoting the price for a 1.5 inch carburetter. | 22th Sep 1931 | Box 31 \ 4 Scan090 | |
| Letter to S.U. Carburetter Co. regarding the return of unsuitable carburettors and a request for a larger version. | 25th Sep 1931 | Box 31 \ 4 Scan091 | |
| Despatch note for returning two loaned S.U. down-draught carburetters after experimental tests. | 28th Sep 1931 | Box 31 \ 4 Scan092 | |
| Letter from The S.U. Company regarding the development and production of carburetters. | 29th Sep 1931 | Box 31 \ 4 Scan093 | |
| Letter to The S.U. Company regarding a blueprint for a large carburetter and tests on smaller units. | 30th Sep 1931 | Box 31 \ 4 Scan094 | |
| Blueprint drawing of a 'China' induction pipe for downdraught S.U. carburettors. | 22th Sep 1931 | Box 31 \ 4 Scan095 | |
| Letter from The S.U. Company regarding the development of a separate slow running carburetter. | 1st Oct 1931 | Box 31 \ 4 Scan096 | |
| Cross-sectional diagram of an adjustable choke and mixture valve assembly for an induction pipe. | 5th Oct 1931 | Box 31 \ 4 Scan097 | |
| Trial and fitment of a large S.U. carburetter for the Phantom II. | 5th Oct 1931 | Box 31 \ 4 Scan098 | |
| Letter to the S.U. Carburetter Co. regarding a carburetter test for a 40/50 HP car. | 19th Oct 1931 | Box 31 \ 4 Scan099 | |
| Letter from The S.U. Company to Mr. Robotham regarding a run in an M.G. | 26th Oct 1931 | Box 31 \ 4 Scan100 | |
| Comparing power output from a single jet and expanding carburettor to a fixed choke diffuser type. | 28th Oct 1931 | Box 31 \ 4 Scan101 | |
| Photograph of a carburettor and ancillary component assembly. | 28th Oct 1931 | Box 31 \ 4 Scan102 | |
| Photograph of a supercharger and carburettor assembly with a ruler placed on top for scale. | 28th Oct 1931 | Box 31 \ 4 Scan103 | |
| Performance comparison graph of S.U. and Claudel carburettors with different induction pipes. | 28th Oct 1931 | Box 31 \ 4 Scan104 | |
| Heavily faded and damaged document with a purple date stamp in the bottom right corner. | 28th Oct 1931 | Box 31 \ 4 Scan105 | |
| Letter to The S.U. Carburetter Co. regarding carburetter fitting and distribution problems. | 29th Oct 1931 | Box 31 \ 4 Scan106 | |
| Request to test a 1 3/8' throttle diameter vertical carburetter on an induction pipe. | 29th Oct 1931 | Box 31 \ 4 Scan107 | |
| Letter from The S.U. Company discussing carburetter performance, hot spots, fuel consumption, and arranging a car test. | 2nd Nov 1931 | Box 31 \ 4 Scan108 | |
| Letter from The S.U. Company regarding a 1 7/8' throttle carburetter. | 19th Nov 1931 | Box 31 \ 4 Scan109 | |
| Development of a new single semi-expanding carburetter to replace the common S.U. type. | 19th Nov 1931 | Box 31 \ 4 Scan110 | |
| Argument for a single carburetter design over S.U. and down-draught types, citing reliability and safety. | 10th Nov 1931 | Box 31 \ 4 Scan111 | |
| Letter to S.U. Carburetter Co. Ltd. concerning distribution issues on the 40/50 model and a criticism from Sir Henry Royce. | 14th Nov 1931 | Box 31 \ 4 Scan112 | |
| Letter discussing test results for the 40/50 model, induction systems, and a petro-lift. | 14th Nov 1931 | Box 31 \ 4 Scan113 | |
| Technical memorandum discussing carburettor configurations and development for various engine types. | 16th Nov 1931 | Box 31 \ 4 Scan114 | |
| Letter from The S.U. Company regarding carburetter distribution troubles and wear criticism. | 16th Nov 1931 | Box 31 \ 4 Scan115 | |
| Continuation page of a letter from The S.U. Company. | 23th Nov 1931 | Box 31 \ 4 Scan116 | |
| Instruction to fit a vertical S.U. carburetter to induction pipe V.1207, making it interchangeable with the existing Claudel Hobson carburetter. | 23th Nov 1931 | Box 31 \ 4 Scan117 | |
| Letter from The S.U. Company regarding an enquiry received from The Margaretting Motor Works. | 25th Nov 1931 | Box 31 \ 4 Scan118 | |
| Letter from The S.U.CO. responding to an enquiry about carburettor options for a six-cylinder engine. | 25th Nov 1931 | Box 31 \ 4 Scan119 | |
| Inquiry from a motor works to a carburettor company regarding a single versus twin carburettor setup for a 6-cylinder car. | 24th Nov 1931 | Box 31 \ 4 Scan120 | |
| Letter to The S.U. Carburetter Co. discussing the suitability of their carburetter for the standard 40/50 unit. | 27th Nov 1931 | Box 31 \ 4 Scan121 | |
| Letter from T.C. Skinner of The S.U. Company to W.A. Robotham, deciding to take no further action on a previously discussed matter. | 28th Nov 1931 | Box 31 \ 4 Scan122 | |
| Letter to the S.U. Carburetter Co. requesting assistance for an ex-apprentice's custom car. | 8th Dec 1931 | Box 31 \ 4 Scan123 | |
| Letter from The S.U. Company to W.A. Robotham regarding assisting Mr. Harker. | 9th Dec 1931 | Box 31 \ 4 Scan124 | |
| Tests comparing vertical and horizontal S.U. carburetors for fuel distribution. | 10th Dec 1931 | Box 31 \ 4 Scan125 | |
| Performance graph comparing two vertical SU carburetor distribution setups, A and B, across a range of RPMs. | 10th Dec 1931 | Box 31 \ 4 Scan126 | |
| Drawing of a central lubrication system pump, showing top and side elevations with pipe connections. | 10th Dec 1931 | Box 31 \ 4 Scan127 | |
| Drawing of an induction pipe for a 30 HP T.T. car, showing multiple views and dimensions. | 12th Dec 1931 | Box 31 \ 4 Scan128 | |
| Letter from The S.U. Company regarding a delay in dispatching a pair of carburettors due to specific finishing requirements. | 12th Dec 1931 | Box 31 \ 4 Scan129 | |
| Letter to The S.U. Company regarding the finish and supply of two 1 3/4 inch carburettors for Sir Henry Royce's consideration. | 14th Dec 1931 | Box 31 \ 4 Scan130 | |
| Letter from The S.U. Company regarding Sir Henry's opinion on carburettors. | 15th Dec 1931 | Box 31 \ 4 Scan131 | |
| Letter from The S.U. Company enclosing a report on carburetter tests conducted on various Morris cars. | 18th Dec 1931 | Box 31 \ 4 Scan132 | |
| Letter to the S.U. Company discussing carburetter tests, performance issues with large S.U. carburetters, and proposed solutions. | 19th Dec 1931 | Box 31 \ 4 Scan133 | |
| Requesting the fabrication of a modified pipe for a Japan 1 cast iron head, based on results from two S.U. carburettors. | 19th Dec 1931 | Box 31 \ 4 Scan134 | |
| Letter from The S.U. Company regarding a visit and a query about the load on a piston in the suction chamber. | 21th Dec 1931 | Box 31 \ 4 Scan135 | |
| Letter to Mr. Skinner of The S.U. Company to arrange a meeting regarding carburetter tests. | 29th Dec 1931 | Box 31 \ 4 Scan136 | |
| Letter to Mr. Skinner of The S.U. Company arranging a meeting to discuss carburettors. | 31th Dec 1931 | Box 31 \ 4 Scan137 | |
| Letter to Mr. Skinner of The S.U. Company requesting a double S.U. petrolift as the single version was inadequate. | 2nd Jan 1932 | Box 31 \ 4 Scan138 | |
| Letter from The S.U. Company to Mr. Robotham arranging a meeting. | 4th Jan 1932 | Box 31 \ 4 Scan139 | |
| Letter from The S.U. Company arranging the delivery of a Duplex Petrolift. | 5th Jan 1932 | Box 31 \ 4 Scan140 | |
| Request to obtain two Smith air silencers for 1 3/4' S.U. carburetters from a supplier in Yorkshire. | 1st Jan 1932 | Box 31 \ 4 Scan141 | |
| Request to transfer S.U. carburetters from experimental car 27-EX to 22-EX for adjustment. | 15th Jan 1932 | Box 31 \ 4 Scan142 | |
| Letter to S.U. Carburetter Co. requesting weaker carburetter needles and noting the fitting of air silencers. | 27th Jan 1932 | Box 31 \ 4 Scan143 | |
| Urgent internal request to obtain two Smith air silencers for S.U. carburettors. | 27th Jan 1932 | Box 31 \ 4 Scan144 | |
| Query regarding the force required to operate the jet seatings on S.U. Carburetters. | 29th Jan 1932 | Box 31 \ 4 Scan145 | |
| Letter to the S.U. Company requesting a carburetter needle change on a 20/25 HP car. | 29th Jan 1932 | Box 31 \ 4 Scan146 | |
| Letter from The S.U. Company confirming a 20/25 HP car will be brought to their works on Monday. | 30th Jan 1932 | Box 31 \ 4 Scan147 | |
| The force required to operate the jet seatings on S.U. Carburetters. | 4th Feb 1932 | Box 31 \ 4 Scan148 | |
| Letter to S.U. Carb. Company requesting the supply of four specific carburetter needles. | 4th Feb 1932 | Box 31 \ 4 Scan149 | |
| Request to S.U. Carburetter Company to send a sample 1 3/4' throttle carburetter to Cadillac for Mr. Olley. | 24th Feb 1932 | Box 31 \ 4 Scan150 | |
| Holding letter from The S.U. Company acknowledging receipt of a letter and advising a full reply will follow. | 25th Feb 1932 | Box 31 \ 4 Scan151 | |
| Letter to S.U. Carb. Company reporting a failure of an S.U. petrolift after 12,000 miles on a 25HP car and requesting a replacement. | 25th Apr 1932 | Box 31 \ 4 Scan152 | |
| Letter to the S.U. Carburetter Company regarding a faulty Morris Petrol Pump. | 25th Apr 1932 | Box 31 \ 4 Scan153 | |
| Letter from The S.U. Company regarding a failing Petrolift pump and its subsequent redesign. | 26th Apr 1932 | Box 31 \ 4 Scan154 | |
| Letter from The S.U. Company regarding the failure analysis of a Petrolift pump. | 28th Apr 1932 | Box 31 \ 4 Scan155 | |
| Receipt of two Petrolift pumps and asking for instruction on what to do with the surplus unit. | 28th Apr 1932 | Box 31 \ 4 Scan156 | |
| Returning a faulty S.U. Petrolift and a related failure report. | 5th May 1932 | Box 31 \ 4 Scan157 | |
| Letter to The S.U. Company regarding a filter failure caused by an over-tightened nut. | 3rd May 1932 | Box 31 \ 4 Scan158 | |
| Letter from The S.U. Company regarding a returned Petrolift pump with a buckled inlet ring. | 28th Apr 1932 | Box 31 \ 4 Scan159 | |
| Letter to the S.U. Company discussing Petrolift performance, carburetter testing, and a potential patent issue. | 7th May 1932 | Box 31 \ 4 Scan160 | |
| The second page of a letter thanking a supplier for carburetters. | 10th May 1932 | Box 31 \ 4 Scan161 | |
| Letter from The S.U. Company regarding a decision on the S.U. Carburetter and criticism of the Petrolift pump. | 10th May 1932 | Box 31 \ 4 Scan162 | |
| Request for information on patents held by Mr. Skinner for the S.U. carburetter central guide. | 23th May 1932 | Box 31 \ 4 Scan163 | |
| Letter to the S.U. Company about using their carburettors on supercharged Bentley engines and petrol lifts. | 23th May 1932 | Box 31 \ 4 Scan164 | |
| Performance of Eyston's M.G. on the track. | 23th May 1932 | Box 31 \ 4 Scan165 | |
| Acknowledging the receipt of a specification from a Mr. Skinner. | 24th May 1932 | Box 31 \ 4 Scan166 | |
| Letter from The S.U. Company discussing carburetter performance, sizing, and filters. | 24th May 1932 | Box 31 \ 4 Scan167 | |
| | | | |
