| Description | Date | Identifier | |
| Letter from The S.U. Company enclosing two copies of the general arrangement drawing for the Kestrel engine carburettor. | 3rd Jul 1934 | Box 31 \ 5 Scan214 | |
| The receipt and forwarding of S.U. carburetter drawings for contract action. | 4th Jul 1934 | Box 31 \ 5 Scan215 | |
| The handover of S.U. Carburetter drawings to hasten a contract for two sets. | 5th Jul 1934 | Box 31 \ 5 Scan216 | |
| Letter from the S.U. Company regarding potential patent infringements by Claudel Hobson on aero carburetters. | 7th Jul 1934 | Box 31 \ 5 Scan217 | |
| Internal memorandum regarding S.U. Carburetters, royalty payments, and needle supplies for the 20/25 HP model. | 9th Jul 1934 | Box 31 \ 5 Scan218 | |
| Letter from The S.U. Co. regarding carburetter royalties and the production and delivery of needles. | 9th Jul 1934 | Box 31 \ 5 Scan219 | |
| Letter to The S.U. Company regarding the supply of carburetter needles. | 9th Jul 1934 | Box 31 \ 5 Scan220 | |
| Letter to The S.U. Carburetter Co. outlining a proposed agreement for a new carburetter design based on S.U. patents. | 13th Jul 1934 | Box 31 \ 5 Scan221 | |
| Attaching a copy of a letter received from the S.U. Company agreeing to proposals. | 18th Jul 1934 | Box 31 \ 5 Scan222 | |
| Letter from The S.U. Company agreeing to the manufacturing arrangements for the new S.U. Carburetter. | 16th Jul 1934 | Box 31 \ 5 Scan223 | |
| Letter from The S.U. Company regarding a delay in dispatching carburettors and pumps for a Bentley. | 17th Jul 1934 | Box 31 \ 5 Scan224 | |
| The poor finish of S.U. Carburetters and a request for larger delivery quantities. | 19th Jul 1934 | Box 31 \ 5 Scan225 | |
| Blueprint of a dual-barrel component with associated linkage, possibly a carburetor. | 26th Jan 1934 | Box 31 \ 5 Scan226 | |
| Letter from The S.U. Company regarding a revised print of SU.0124 with alterations. | 19th Jul 1934 | Box 31 \ 5 Scan227 | |
| Letter to The S.U. Company regarding petrol pumps and carburetter float chamber covers. | 23th Jul 1934 | Box 31 \ 5 Scan228 | |
| Letter from The S.U. Company regarding new castings for an S.U. 0124 float chamber and requesting material specifications. | 26th Jul 1934 | Box 31 \ 5 Scan229 | |
| Letter to S.U. Carburetter Co. Ltd. regarding modifications to a float chamber pattern and a supercharger case. | 27th Jul 1934 | Box 31 \ 5 Scan230 | |
| Internal request to issue an official order for petrol pumps and carburettors to the S.U. Co. | 14th Jul 1934 | Box 31 \ 5 Scan231 | |
| Letter from The S.U. Company regarding a supercharged casing and carburetter parts. | 1st Aug 1934 | Box 31 \ 5 Scan232 | |
| Request to S.U. Company Ltd. for 6 experimental needles with specified dimensions for use on a 3½ litre Bentley. | 22th Aug 1934 | Box 31 \ 5 Scan233 | |
| Letter to S.U. Company Ltd. regarding a carburettor float chamber stud problem. | 13th Sep 1934 | Box 31 \ 5 Scan234 | |
| Requesting the modification of two air valves for a Bentley carburation system. | 18th Sep 1934 | Box 31 \ 5 Scan235 | |
| Letter from The S.U. Company regarding an enclosed installation drawing and the transfer of a carburetter. | 24th Sep 1934 | Box 31 \ 5 Scan236 | |
| Letter to The S.U. Company regarding flooding issues in Bentley carburettors, suggesting a fault in the float mechanism. | 24th Sep 1934 | Box 31 \ 5 Scan237 | |
| Invoice from S.U.Co for an experimental Kestrel Aero Engine carburetter. | 28th Sep 1934 | Box 31 \ 5 Scan238 | |
| Hs. to Roy requesting an order be placed with S.U. Carburetters Ltd. for a Kestrel engine part. | 4th Oct 1934 | Box 31 \ 5 Scan239 | |
| Letter to The S.U. Co. Ltd. regarding flooding carburetter issues caused by rough needles and a discussion on fuel pump core specifications. | 19th Oct 1934 | Box 31 \ 5 Scan240 | |
| Letter requesting to be informed of any future modifications to pumps or carburetters. | 19th Oct 1934 | Box 31 \ 5 Scan241 | |
| Modified S.U. carburetter float chamber design. | 24th Oct 1934 | Box 31 \ 5 Scan242 | |
| Test report comparing the performance of standard A.W. needles and new experimental needles on S.U. carburettors fitted to two Bentley cars. | 25th Oct 1934 | Box 31 \ 5 Scan243 | |
| Carburettor performance, comparing lap speeds with new and old type carburetters on a 20/25HP car. | 25th Oct 1934 | Box 31 \ 5 Scan244 | |
| Letter to S.U. Co. regarding suggested modifications for a floatchamber on a Bentley carburetter. | 27th Oct 1938 | Box 31 \ 5 Scan245 | |
| Typed letter detailing improvements and omissions related to a petrol joint, drainage pipe, and float tickler. | 6th Nov 1934 | Box 31 \ 5 Scan246 | |
| Letter to The S.U. Co. Ltd. regarding a stripped thread on the carburetter float chamber stud, requesting a modification. | 6th Nov 1934 | Box 31 \ 5 Scan247 | |
| Letter to C.T. Skinner of The S.U. Co. Ltd. regarding a forwarded float chamber with a stripped stud boss. | 8th Nov 1934 | Box 31 \ 5 Scan248 | |
| Confirming promising bench test results for S.U. carburettors on Kestrel engines and arranging for design improvements. | 10th Nov 1934 | Box 31 \ 5 Scan249 | |
| Letter to a supplier complaining about the poor finish and cleanliness of supplied Bentley carburetter parts. | 12th Nov 1934 | Box 31 \ 5 Scan250 | |
| Letter from The S.U. Company regarding dirt and swarf found in their carburetters. | 13th Nov 1934 | Box 31 \ 5 Scan251 | |
| Letter to The S.U. Carburetter Co. requesting 6 needles with specific dimensions for a 3.5 litre Bentley car. | 13th Nov 1934 | Box 31 \ 5 Scan252 | |
| Letter from The S.U. Company regarding a returned float chamber and a necessary alteration. | 13th Nov 1934 | Box 31 \ 5 Scan253 | |
| Letter from The S.U. Company concerning the arrangement of special needles and a chart for the 'AW' needle. | 14th Nov 1934 | Box 31 \ 5 Scan254 | |
| Letter to The S.U. Company acknowledging receipt of needles but requesting a missing chart. | 16th Nov 1934 | Box 31 \ 5 Scan255 | |
| Letter from The S.U. Company regarding the safe arrival of needles and enclosing a further needle chart. | 17th Nov 1934 | Box 31 \ 5 Scan256 | |
| Data table of comparative dimensions for Rover, Bentley, M.G., and Lea-Francis components. | 19th Nov 1934 | Box 31 \ 5 Scan257 | |
| Letter acknowledging receipt of a letter and chart from The S.U. Company. | 19th Nov 1934 | Box 31 \ 5 Scan258 | |
| The dispatch of supercharger and carburetter parts to the S.U. Company for assembly. | 19th Nov 1934 | Box 31 \ 5 Scan259 | |
| Cover sheet for a chart of standard needles fitted to Bentley cars. | 19th Nov 1934 | Box 31 \ 5 Scan260 | |
| Bentley carburation issues and the testing of experimental needles to improve snap acceleration. | 19th Nov 1934 | Box 31 \ 5 Scan261 | |
| Letter from The S.U. Company thanking for the receipt of carburetter castings for the Kestrel engine. | 23th Nov 1934 | Box 31 \ 5 Scan262 | |
| Letter to S.U. Carburetter Co. requesting four experimental needles ('XB9') with specified dimensions. | 3rd Dec 1934 | Box 31 \ 5 Scan263 | |
| Letter to The S.U. Company Ltd. regarding the performance of their carburetter on a Kestrel engine. | 7th Dec 1934 | Box 31 \ 5 Scan264 | |
| Letter discussing carburettor performance regarding altitude correction and arranging a visit. | 7th Dec 1934 | Box 31 \ 5 Scan265 | |
| Points of criticism for the design and operation of the S.U. (Aero) carburetter. | 10th Dec 1934 | Box 31 \ 5 Scan266 | |
| List of issues and recommended modifications for an S.U. Carburetter. | 10th Dec 1934 | Box 31 \ 5 Scan267 | |
| List of design requirements and modifications for various engine components. | 10th Dec 1934 | Box 31 \ 5 Scan268 | |
| Page 3 of a report comparing the weight and durability of Dural versus steel nuts. | 10th Dec 1934 | Box 31 \ 5 Scan269 | |
| Letter from The S.U. Company confirming an appointment for a visit. | 10th Dec 1934 | Box 31 \ 5 Scan270 | |
| Outlining decisions from a meeting with the S.U. Co. regarding modifications to the experimental S.U. Aero Carburetter. | 12th Dec 1934 | Box 31 \ 5 Scan271 | |
| Design modifications and agreements for the S.U. Aero Carburetter. | 11th Dec 1934 | Box 31 \ 5 Scan272 | |
| List of modifications and considerations for carburettor components. | 11th Dec 1934 | Box 31 \ 5 Scan273 | |
| Notes on carburetter design issues including sandwich casting, aneroid locking, plugs and throttles. | 11th Dec 1934 | Box 31 \ 5 Scan274 | |
| Page of meeting notes detailing design agreements on carburettor and engine components. | 20th Dec 1934 | Box 31 \ 5 Scan275 | |
| The development work for the S.U. Automatic Carburetter for Aero Engines. | 20th Dec 1934 | Box 31 \ 5 Scan276 | |
| The S.U. Automatic Carburetter for aero engines, detailing its design, operation, and advantages. | 20th Dec 1934 | Box 31 \ 5 Scan277 | |
| Technical report on the development and operation of carburetter systems, including slow running and altitude compensation. | 20th Dec 1934 | Box 31 \ 5 Scan278 | |
| Investigation into carburetter mixture weakening, automatic correction, throttle characteristics, and potential modifications. | 20th Dec 1934 | Box 31 \ 5 Scan279 | |
| Conclusions on throttle system gland leaks and proposed carburettor flight tests on a 'Hart' aircraft for altitude needle calibration. | 20th Dec 1934 | Box 31 \ 5 Scan280 | |
| Sketch of an S.U. Aero Carburetter showing the position of jets at the throttle edge. | 21th Dec 1934 | Box 31 \ 5 Scan281 | |
| Graph showing the richening characteristic of the boost controlled aneroid on a Kestrel VI engine at 2200 RPM. | 21th Dec 1934 | Box 31 \ 5 Scan282 | |
| Blank page with a 'Print Room' stamp from Derby. | 21th Dec 1934 | Box 31 \ 5 Scan283 | |
| Graph showing fuel flow versus altitude for an S.U. carburetter with a fixed throttle. | 10th Dec 1934 | Box 31 \ 5 Scan284 | |
| Graph showing the throttle characteristics of an S.U. carburetter on a Kestrel VI engine at various altitudes. | 1st Mar 1934 | Box 31 \ 5 Scan285 | |
| Constant speed throttle curve graph comparing S.U. and Kestrel VI carburetters on a Kestrel VI engine. | 10th Dec 1934 | Box 31 \ 5 Scan286 | |
| Graph comparing the constant speed throttling curve of an S.U. carburettor with a Kestrel VI carburettor on a Kestrel VI engine. | 10th Dec 1934 | Box 31 \ 5 Scan287 | |
| Letter from The S.U. Company cancelling an appointment due to a family illness. | 31th Dec 1934 | Box 31 \ 5 Scan288 | |
| Troubles and improvement schemes for the 20/25 HP S.U. Carburetter. | 9th Jan 1935 | Box 31 \ 5 Scan289 | |
| Letter requesting the supply of two pairs of needles with specified dimensions. | 10th Jan 1935 | Box 31 \ 5 Scan290 | |
| Requesting the resumption of anti-corrosion treatment for S.U. fuel pump and carburettor parts due to recent corrosion issues. | 11th Jan 1935 | Box 31 \ 5 Scan291 | |
| Letter to The S.U. Company Ltd. regarding a petrol pump diaphragm and carburetter flooding issues on a Bentley. | 22th Jan 1935 | Box 31 \ 5 Scan292 | |
| Request to the S.U. Carburetter Co. for a pair of modified experimental needles (XC3) with specified dimensions. | 1st Feb 1935 | Box 31 \ 5 Scan293 | |
| Letter from The S.U. Company discussing the design and performance of float chambers and pumps. | 7th Feb 1935 | Box 31 \ 5 Scan294 | |
| Drawing for an improved Bentley carburetter float chamber from the S.U. Co. | 9th Feb 1935 | Box 31 \ 5 Scan295 | |
| Request to S.U. Carburetter Co. Ltd. for diaphragm assemblies and diaphragms made of German material. | 16th Feb 1935 | Box 31 \ 5 Scan296 | |
| Invoice from S.U.Co. for a pair of HV5 H.R. Type Carburetters for a Bentley. | 21th Feb 1935 | Box 31 \ 5 Scan297 | |
| Request to the S.U. Company Ltd. for different types of carburetter needles. | 21th Feb 1935 | Box 31 \ 5 Scan298 | |
| Letter from The S.U. Company acknowledging receipt of an order. | 22th Feb 1935 | Box 31 \ 5 Scan299 | |
| The address side of a postcard sent to the Experimental Department in Derby. | 23th Feb 1935 | Box 31 \ 5 Scan300 | |
| Order be placed for a pair of HV5 H.R. Type Carburetters for a Bentley. | 23th Feb 1935 | Box 31 \ 5 Scan301 | |
| Request to the S.U. Carburetter Co. Ltd. for 4 pairs of needles with specified dimensions. | 25th Feb 1935 | Box 31 \ 5 Scan302 | |
| Invoice from S.U.Co. for R.R. & R.R.X. Jet Needles and a request for a covering order. | 26th Feb 1935 | Box 31 \ 5 Scan303 | |
| Authorising payment for needles. | 27th Feb 1935 | Box 31 \ 5 Scan304 | |
| Letter to Mr Skinner of S.U. Co. providing feedback and suggestions on a proposed modified float-chamber blueprint. | 27th Feb 1935 | Box 31 \ 5 Scan305 | |
| Letter to Messrs. S.U. Co. detailing feedback on carburettor components. | 27th Feb 1935 | Box 31 \ 5 Scan306 | |
| Letter from The S.U. Company regarding an upcoming meeting and the design of pistons. | 11th Mar 1935 | Box 31 \ 5 Scan307 | |
| Letter to The S.U. Carburetter Co. Ltd. chasing up an order for special carburetters and requesting jets for a Bentley. | 13th Mar 1935 | Box 31 \ 5 Scan308 | |
| Letter to The S.U. Company Ltd. regarding issues with seatings and float chamber modifications. | 15th Mar 1935 | Box 31 \ 5 Scan309 | |
| Proposal to use a shouldered nut and lengthened screw for the S.U. carburetter throttle adjustment to improve accessibility. | 23th Mar 1935 | Box 31 \ 5 Scan310 | |
| Letter from The S.U. Company regarding a duplicated order of carburetter needles. | 25th Mar 1935 | Box 31 \ 5 Scan311 | |
| Letter to The S.U. Company Ltd. regarding a roughly cut carburetter needle seating causing issues. | 27th Mar 1935 | Box 31 \ 5 Scan312 | |
| Letter from The S.U. Company regarding the examination of a returned seating and the dispatch of requested spares. | 28th Mar 1935 | Box 31 \ 5 Scan313 | |
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