| Description | Date | Identifier | |
| Continuation of a letter discussing a sticking plunger and the high-speed performance of M.G. cars. | 30th May 1932 | Box 31 \ 4 Scan168 | |
| Extract detailing objections to the SU carburetter due to petrol dripping and inconsistency compared to their own fixed adjustment model. | 30th May 1932 | Box 31 \ 4 Scan169 | |
| Letter to the S.U. Company requesting feedback on designs for a 2.4-litre engine with a Powerplus blower. | 8th Jun 1932 | Box 31 \ 4 Scan170 | |
| Arranging a meeting with Mr. Skinner of the S.U. Carburetter Co. to discuss carburetters. | 10th Jun 1932 | Box 31 \ 4 Scan171 | |
| Letter to the S.U. Carburetter Co. confirming a meeting to discuss carburetters. | 10th Jun 1932 | Box 31 \ 4 Scan172 | |
| Letter from The S.U. Company confirming an appointment with Mr. Robotham. | 15th Jun 1932 | Box 31 \ 4 Scan173 | |
| Patent issues and royalties related to the R.R. Expanding Carburetter. | 18th Jun 1932 | Box 31 \ 4 Scan174 | |
| Letter to The S.U. Carburetter Co. Ltd. discussing carburetter specifications, requesting information on Alvis induction pipes, and noting an incorrect carburetter was supplied. | 30th Jun 1932 | Box 31 \ 4 Scan175 | |
| Letter from The S.U. Company discussing carburetter types and the induction systems used on Alvis cars. | 1st Jul 1932 | Box 31 \ 4 Scan176 | |
| Letter from The S.U. Company regarding the fitting of a balance pipe to stop piston flutter. | 1st Jul 1932 | Box 31 \ 4 Scan177 | |
| Blueprint of an exhaust manifold with integrated induction passages and pressure balance pipes. | 1st Jul 1932 | Box 31 \ 4 Scan178 | |
| Blueprint showing front and side elevations of a W-shaped four-port exhaust manifold. | 1st Jul 1932 | Box 31 \ 4 Scan179 | |
| Design for a 60mm automatic jet control for an S.U. type carburetter. | 7th Oct 1932 | Box 31 \ 4 Scan180 | |
| Suggested layout for a hot air pipe for a 25HP engine, showing various views and dimensions. | 7th Oct 1932 | Box 31 \ 4 Scan181 | |
| Blueprint for a right-hand feed lid for a Type T2 top feed float chamber. | 21th Oct 1931 | Box 31 \ 4 Scan182 | |
| Page featuring a purple 'RECEIVED' date stamp. | 29th May 1933 | Box 31 \ 4 Scan183 | |
| Blueprint of a jet assembly shown in the dropped position. | 14th Jul 1933 | Box 31 \ 4 Scan184 | |
| Blueprint for a Glandless Control Type carburetter body made from gun-metal casting. | 14th Jul 1933 | Box 31 \ 4 Scan185 | |
| Technical drawing and table showing the overall dimensions of standard SU carburetters. | 30th Jan 1933 | Box 31 \ 4 Scan186 | |
| Outline drawing of a 60mm Auto Jet Control mechanism. | 30th Jan 1933 | Box 31 \ 4 Scan187 | |
| The performance of brass and aluminium pistons in a carburetter for a 25 HP engine. | 4th Jul 1932 | Box 31 \ 4 Scan188 | |
| Letter to the S.U. Carburetter Co. discussing the performance and trial of their carburetter on a 25 HP car unit fitted to a tank. | 4th Jul 1932 | Box 31 \ 4 Scan189 | |
| Letter to The S.U. Carburetter Co. about testing their carburetters on a car and a tank. | 5th Jul 1932 | Box 31 \ 4 Scan190 | |
| Letter to the S.U. Carburetter Co. regarding criticism of the appearance of their carburettors. | 5th Jul 1932 | Box 31 \ 4 Scan191 | |
| Forwarding advice from a Mr. Skinner regarding carburetter tuning and the potential need for a different piston. | 6th Jul 1932 | Box 31 \ 4 Scan192 | |
| Letter from the S.U. Company concerning a specially finished carburetter and its price. | 7th Jul 1932 | Box 31 \ 4 Scan193 | |
| Carburetter fuel consumption and a request for a new needle. | 9th Jul 1932 | Box 31 \ 4 Scan194 | |
| Disappointing carburettor needle being too rich for slow riding. | 5th Jul 1932 | Box 31 \ 4 Scan195 | |
| Letter from The S.U. Company following up on a telegram about the suspension of a 1 1/2' Carburetter and a missing letter. | 13th Jul 1932 | Box 31 \ 4 Scan196 | |
| Letter to the S.U. Company comparing the performance of different carburetter models on an engine. | 15th Jul 1932 | Box 31 \ 4 Scan197 | |
| Letter to S.U.Co. Limited requesting a more suitable range of carburetter needles. | 2nd Aug 1932 | Box 31 \ 4 Scan198 | |
| Letter from The S.U. Company regarding the dispatch of a range of carburettor needles and charts. | 4th Aug 1932 | Box 31 \ 4 Scan199 | |
| Letter to The S.U. Company thanking them for enclosed needles. | 8th Aug 1932 | Box 31 \ 4 Scan200 | |
| Requesting a formal order for two S.U. Carburetters, confirming they have been tested and are satisfactory for use on the Peregrine engine. | 13th Aug 1932 | Box 31 \ 4 Scan201 | |
| Letter to the S.U. Company regarding results from their small carburettors, reproduction of plated needles, and supercharger testing. | 15th Aug 1932 | Box 31 \ 4 Scan202 | |
| Letter to Mr. Skinner of The S.U. Company regarding carburetter performance. | 6th Aug 1932 | Box 31 \ 4 Scan203 | |
| Despatch of S.U. carburetter needles to the S.U. Carburetter Co. | 6th Aug 1932 | Box 31 \ 4 Scan204 | |
| Letter from The S.U. Company regarding a 1 3/4 inch carburetter. | 16th Jul 1932 | Box 31 \ 4 Scan205 | |
| Letter from Electric Heating & Hardware Ltd. proposing a patented improvement for S.U. Carburetter needles. | 29th Aug 1932 | Box 31 \ 4 Scan206 | |
| Proposed S.U. carburetter scheme for the Bensport engine, referencing blueprint Lec.3190. | 6th Sep 1932 | Box 31 \ 4 Scan207 | |
| Letter to Electric Heating & Hardware Ltd. regarding a matter being taken up with W.O. Bentley and Mr. Skinner of the S.U. Carburetter Co. | 12th Sep 1932 | Box 31 \ 4 Scan208 | |
| Letter to S.U. Carburetter Co. Ltd. discussing carburetter designs for a supercharged car and seeking an opinion on a claimed modification. | 12th Sep 1932 | Box 31 \ 4 Scan209 | |
| Query regarding a claimed improvement to an S.U. carburetter by serrating the needle on a 6-litre Bentley. | 12th Sep 1932 | Box 31 \ 4 Scan210 | |
| Letter from Electric Heating & Hardware Ltd. regarding the production of carburetter needles, referencing W.O. Bentley and the S.U. Carburetter Co. | 13th Sep 1932 | Box 31 \ 4 Scan211 | |
| Letter from the S.U. Company regarding the testing of serrated needles for a Bentley car. | 13th Sep 1932 | Box 31 \ 4 Scan212 | |
| Modifications and safety concerns regarding the S.U. carburetter for the Bensport engine. | 14th Sep 1932 | Box 31 \ 4 Scan213 | |
| Letter from The S.U. Company regarding the supply of carburetter sets for 40 HP and 25 HP models. | 16th Sep 1932 | Box 31 \ 4 Scan214 | |
| Letter to The S.U. Carburetter Co. Ltd. regarding carburetter testing and new pistons for the 20/25 HP and 40/50 models. | 19th Sep 1932 | Box 31 \ 4 Scan215 | |
| Letter from The S.U. Company about a Bentley Special jet control issue and the supply of a conversion set. | 20th Sep 1932 | Box 31 \ 4 Scan216 | |
| Blueprint of a twin carburetor assembly with connecting linkages. | 22th Sep 1932 | Box 31 \ 4 Scan217 | |
| Confirming a copy of a letter addressed to Mr. T.C. Skinner of Messrs. S.U. Co. is attached. | 22th Sep 1932 | Box 31 \ 4 Scan218 | |
| Letter to The S.U. Co. regarding the development of a carburetter for a Bentley car, enclosing blueprints. | 21th Sep 1932 | Box 31 \ 4 Scan219 | |
| Letter to the S.U. Carburetter Co. regarding the return of jet control levers for a 4 litre Bentley. | 23th Sep 1932 | Box 31 \ 4 Scan220 | |
| The despatch of a parcel of jet control levers to the S.U. Carburetter Co. | 23th Sep 1932 | Box 31 \ 4 Scan221 | |
| Letter from The S.U. Company regarding the effect of German fuels on diaphragm pump fabric. | 29th Sep 1932 | Box 31 \ 4 Scan222 | |
| Letter to the S.U. Carburetter Co. regarding the supply and tuning of smaller carburetters for a 3.5 litre engine. | 29th Sep 1932 | Box 31 \ 4 Scan223 | |
| Letter to S.U. Carburetter Co. discussing carburetter performance and development. | 30th Sep 1932 | Box 31 \ 4 Scan224 | |
| Letter to the S.U. Carburetter Co. Ltd. regarding carburetter parts and an air silencer. | 30th Sep 1932 | Box 31 \ 4 Scan225 | |
| Letter from The S.U. Company regarding carburettors, air silencers and automatic jet control. | 3rd Oct 1932 | Box 31 \ 4 Scan226 | |
| Blueprint for a suggested air cleaner pipe. | 3rd Oct 1932 | Box 31 \ 4 Scan227 | |
| Letter to Mr. Skinner of The S.U. Company regarding difficulty fitting an air silencer to a carburetter due to space constraints. | 4th Oct 1932 | Box 31 \ 4 Scan228 | |
| Letter discussing a hot air pipe design, fuel despatch, and a request for data on a thermostatic device. | 6th Oct 1932 | Box 31 \ 4 Scan229 | |
| Letter to S.U. Carburetter Co. Ltd. regarding intake pipes and bonnet temperature figures. | 7th Oct 1932 | Box 31 \ 4 Scan230 | |
| Letter to The S.U. Carburetter Co. regarding bonnet temperature results and new carburetter development. | 11th Oct 1932 | Box 31 \ 4 Scan231 | |
| Log of engine temperature readings taken at one-minute intervals during a road test. | 11th Oct 1932 | Box 31 \ 4 Scan232 | |
| Test results showing water and under-bonnet air temperatures recorded at one-minute intervals. | 12th Oct 1932 | Box 31 \ 4 Scan233 | |
| Letter from The S.U. Company regarding temperature problems and a delay in completing two carburettors due to a piston issue. | 12th Oct 1932 | Box 31 \ 4 Scan234 | |
| Letter from the S.U. Company requesting for an inventor to inspect an engine to fit a Thermostatic/Jet Control device. | 27th Oct 1932 | Box 31 \ 4 Scan235 | |
| Letter to the S.U. Carburetter Co. Ltd. discussing carburetter size and engine performance. | 2nd Nov 1932 | Box 31 \ 4 Scan236 | |
| Letter from The S.U. Company regarding carburetter throttle bores and modifications. | 3rd Nov 1932 | Box 31 \ 4 Scan237 | |
| Tests on different sized S.U. carburettors on a J.1 engine. | 9th Nov 1932 | Box 31 \ 4 Scan238 | |
| Performance graph for a 20/25 HP engine, Unit C.9, with a J.L. head, comparing different configurations. | 7th Jan 1932 | Box 31 \ 4 Scan239 | |
| Reverse side of a document or drawing, stamped by the Print Room in Derby. | 10th Nov 1932 | Box 31 \ 4 Scan240 | |
| Requesting an order to be passed to S.U. Carburetter Co. for two HV4H carburettors for Bensport. | 11th Nov 1932 | Box 31 \ 4 Scan241 | |
| Discussion about potential patent infringement regarding a semi-expanding carburetter and the S.U. patent. | 28th Nov 1932 | Box 31 \ 4 Scan242 | |
| Letter from The S.U. Company regarding the fitting of a proposed thermostat for a Rolls-Royce. | 8th Dec 1932 | Box 31 \ 4 Scan243 | |
| Letter to the S.U. Carburetter Co. regarding the fitting of a thermostat and induction pipe. | 12th Dec 1932 | Box 31 \ 4 Scan244 | |
| Letter from The S.U. Company to W.A. Robotham regarding a thermostat and arranging to see the car. | 13th Dec 1932 | Box 31 \ 4 Scan245 | |
| Letter to The S.U. Carburetter Co. regarding the supply and heat treatment of thin sheet aluminium for experimental use. | 14th Dec 1932 | Box 31 \ 4 Scan246 | |
| Letter from The S.U. Company thanking Mr. Robotham for his letter regarding Sheet Aluminium. | 15th Dec 1932 | Box 31 \ 4 Scan247 | |
| Letter to The S.U. Carburetter Co. regarding modifications and testing of a car's carburetter and induction system. | 20th Dec 1932 | Box 31 \ 4 Scan248 | |
| Letter discussing the camshaft for a 25 HP engine and enclosing a separate letter about an air valve. | 20th Dec 1932 | Box 31 \ 4 Scan249 | |
| Letter from The S.U. Company regarding a delay in sending a car and enclosing a letter from Mr. Elliot. | 21th Dec 1932 | Box 31 \ 4 Scan250 | |
| Letter to S.U. Carburetter Co regarding issues with carburettor performance, distribution, and a rich low-speed mixture. | 28th Dec 1932 | Box 31 \ 4 Scan251 | |
| Letter to S.U. Carburetter Co. regarding a blueprint for the arrangement of carburetter controls. | 29th Dec 1932 | Box 31 \ 4 Scan252 | |
| Letter from The S.U. Company to Mr. Robotham acknowledging receipt of a drawing of the controls. | 30th Dec 1932 | Box 31 \ 4 Scan253 | |
| Letter to the S.U. Company requesting information on carburettors with water heated hot spots. | 31th Dec 1932 | Box 31 \ 4 Scan254 | |
| Dispatch request for six complete and assembled ball end controls to be sent to T.C. Skinner at S.U. Company. | 5th Jan 1933 | Box 31 \ 5 Scan001 | |
| Request to The S.U. Company for two 1 3/4' carburetters and an update on progress. | 2nd Jan 1933 | Box 31 \ 5 Scan002 | |
| Letter to The S.U. Company regarding hot spot testing and ordering a pressure pump for bench tests to be shown to Sir Henry Royce. | 13th Jan 1933 | Box 31 \ 5 Scan003 | |
| Letter to The S.U. Company regarding a pump blueprint, plugs, and an induction pipe. | 14th Jan 1933 | Box 31 \ 5 Scan004 | |
| Letter from The S.U. Company regarding slow running tests, pump stampings for Sir Henry, and a drawing of an automatic cylinder bore oiler. | 14th Jan 1933 | Box 31 \ 5 Scan005 | |
| Continuation page of a letter to The S. U. Company explaining the oil flow and piston mechanism in an engine. | 13th Jan 1933 | Box 31 \ 5 Scan006 | |
| Diagram of an apparatus for supplying extra oil during cold starts. | 13th Jan 1933 | Box 31 \ 5 Scan007 | |
| Letter to S.U. Company regarding a test run on a 25 HP car fitted with their altered induction pipes. | 23th Jan 1933 | Box 31 \ 5 Scan008 | |
| Letter from The S.U. Company discussing a chart that shows the performance differences between three carburetter needles following modifications to an induction pipe. | 23th Jan 1933 | Box 31 \ 5 Scan009 | |
| Graph showing test results for different induction pipe variations on a 25 HP experimental engine with an SU HV4 carburettor. | 25th Jan 1933 | Box 31 \ 5 Scan010 | |
| Letter from The S.U. Company regarding the running of the 25 HP car and a suggestion for fitting carburetters. | 25th Jan 1933 | Box 31 \ 5 Scan011 | |
| Letter from S. Smith & Sons regarding a proposed modification to an automatic jet control unit. | 2nd Feb 1933 | Box 31 \ 5 Scan012 | |
| Letter from The S.U. Company regarding a potential issue with pump diaphragms sticking together. | 3rd Feb 1933 | Box 31 \ 5 Scan013 | |
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