| Description | Date | Identifier | |
| Letter to The Zenith Carburettor Co. Ltd. thanking them for Christmas greetings. | 5th Jan 1938 | Box 122 \ 2 scan0311 | |
| Letter from Zenith Carburetter Co. Ltd. concerning a float chamber cover modification for the 25/30 HP model. | 7th Jan 1938 | Box 122 \ 2 scan0312 | |
| Letter to The Zenith Carburettor Co. Ltd. regarding modifications and issues with carburettor components. | 12th Jan 1939 | Box 122 \ 2 scan0313 | |
| Letter to Zenith Carburettor Co. Ltd. regarding design issues and failures with carburettor components. | 12th Jan 1938 | Box 122 \ 2 scan0314 | |
| Request to Zenith Carburettors for 12 taper packings for the Phantom III carburettor. | 14th Jan 1938 | Box 122 \ 2 scan0315 | |
| Letter to Zenith Carburetter Co. Ltd. regarding a failed Phantom III float for replacement. | 18th Jan 1938 | Box 122 \ 2 scan0316 | |
| Letter from The Zenith Carburetter Co. Ltd. regarding the supply and modification of carburetter parts and associated costs. | 18th Jan 1938 | Box 122 \ 2 scan0317 | |
| Page 2 of a letter from The Zenith Carburetter Co. to Rolls-Royce Ltd., Derby, quoting a price of £3. | 18th Jan 1938 | Box 122 \ 2 scan0318 | |
| Letter from Zenith Carburetter Co Ltd concerning modifications to the DC-42 carburetter. | 19th Jan 1938 | Box 122 \ 2 scan0319 | |
| Letter from Zenith Carburetter Co. discussing modifications to a poppet valve, piston assembly, and throttle screws for an EEC-42 carburetter. | 19th Jan 1938 | Box 122 \ 2 scan0320 | |
| Letter from Zenith Carburetter Co. Ltd. following up on sample DC-42 carburetters sent for approval. | 24th Jan 1938 | Box 122 \ 2 scan0321 | |
| Letter to The Zenith Carburetter Co. Ltd. chasing an urgent delivery of taper packings for Phantom III carburettors. | 26th Jan 1938 | Box 122 \ 2 scan0322 | |
| Official order for 12 Taper packings for Phantom III carburetters from The Zenith Carburetter Co. Ltd. | 27th Jan 1938 | Box 122 \ 2 scan0323 | |
| Letter to the Zenith Carburettor Co. Ltd. regarding samples, packings, and a request for gaskets. | 1st Feb 1938 | Box 122 \ 2 scan0324 | |
| Letter from Zenith Carburetter Co. Ltd. regarding a query about an untraceable order for special taper packings. | 2nd Feb 1938 | Box 122 \ 2 scan0325 | |
| Order office copy sent to Zenith Carburetter Co. Ltd. for carburetter packings. | 29th Jan 1938 | Box 122 \ 2 scan0326 | |
| Letter from Zenith Carburetter Co. Ltd regarding difficulties supplying 12 taper packings for order No.55983 and discussing alternative gaskets. | 3rd Feb 1938 | Box 122 \ 2 scan0327 | |
| Letter from The Zenith Carburetter Co. confirming the despatch of thin gaskets. | 3rd Feb 1938 | Box 122 \ 2 scan0328 | |
| Order for graphited Cooperite washers and cancelling a previous order for taper packings. | 5th Feb 1938 | Box 122 \ 2 scan0329 | |
| Complaints of faulty starting due to a new, excessively strong choke torsion spring on a 25/30 HP Stromberg carburetter. | 24th Feb 1938 | Box 122 \ 2 scan0330 | |
| Letter from Zenith Carburetter Co. Ltd regarding a Twin Stromberg carburetter layout with an electrically heated thermostat. | 24th Feb 1938 | Box 122 \ 2 scan0331 | |
| Letter to the Zenith Carburetter Co. regarding a faulty needle and seating and a request for new leather pistons. | 3rd Mar 1938 | Box 122 \ 2 scan0332 | |
| Request to send a covering order to The Zenith Carb. Co. Ltd. for 3 leather pistons for the Wraith cars. | 3rd Mar 1938 | Box 122 \ 2 scan0333 | |
| Letter from Zenith Carburetter Co. Ltd regarding carburetter parts for Phantom III and 30 HP models. | 7th Mar 1938 | Box 122 \ 2 scan0334 | |
| Request for drawings and parts to be made for 6 spindles and 12 springs, based on attached sketches. | 24th Mar 1938 | Box 122 \ 2 scan0335 | |
| Letter to Zenith Carburettor Co. Ltd. about choke sticking issues on a 30 HP D.C. 42 carburettor. | 1st Apr 1938 | Box 122 \ 2 scan0336 | |
| Component modifications and a request for parts. | 1st Apr 1938 | Box 122 \ 2 scan0337 | |
| Request for a covering order for parts ordered from Zenith Carburettor Co. Ltd. | 1st Apr 1938 | Box 122 \ 2 scan0338 | |
| Request for photomicrographs of carburettor needles and seats to show the worst condition of finish. | 5th Apr 1938 | Box 122 \ 2 scan0339 | |
| Letter from Zenith Carburetter Co. Ltd regarding the strangler portion of a 30 HP DC-42 carburetter. | 7th Apr 1938 | Box 122 \ 2 scan0340 | |
| Letter from The Zenith Carburetter Co. discussing modifications and further tests on specific items like a Jubilee clip. | 7th Apr 1938 | Box 122 \ 2 scan0341 | |
| Delivery note from The Zenith Carburetter Co., Ltd. for one raw barrel carburetter part. | 7th Apr 1938 | Box 122 \ 2 scan0342 | |
| The poor finish of Stromberg carburetter needles compared to the superior S.U. standard, with information passed to Zenith. | 9th Apr 1938 | Box 122 \ 2 scan0343 | |
| Order for a Raw Barrel to Zenith Carburetter Co., Ltd. | 12th Apr 1938 | Box 122 \ 2 scan0344 | |
| Requesting a covering order for Zenith Carburettor parts that have been received for testing. | 12th Apr 1938 | Box 122 \ 2 scan0345 | |
| Letter to Zenith Carburetter Co. Ltd. concerning flooding issues in Phantom III and 30 HP carburetters. | 13th Apr 1938 | Box 122 \ 2 scan0346 | |
| Letter from Zenith Carburetter Co. Ltd regarding the finish on needle valve samples for evaluation. | 13th Apr 1938 | Box 122 \ 2 scan0347 | |
| Letter from The Zenith Carburetter Co Ltd regarding a revised carburetter price and sample needles. | 19th Apr 1938 | Box 122 \ 2 scan0348 | |
| Laboratory report on a carburetter needle material sample from Zenith Carburetter Co. Ltd. | 21th Apr 1938 | Box 122 \ 2 scan0349 | |
| Laboratory report on a carburetter needle material sample from Zenith Carburetter Co. Ltd. | 21th Apr 1938 | Box 122 \ 2 scan0350 | |
| Letter to the Zenith Carburettor Co. Ltd. regarding the improved finish of Stromberg sample needles. | 22th Apr 1938 | Box 122 \ 2 scan0351 | |
| Letter from The Zenith Carburetter Co. Ltd requesting an official order for previously dispatched parts. | 25th Apr 1938 | Box 122 \ 2 scan0352 | |
| Requesting payment for one top 7/16 x 24 T.P.I. and 12 joint washers L.1426 from Zenith Carb. Co. Ltd. | 26th Apr 1938 | Box 122 \ 2 scan0353 | |
| Letter to the Zenith Carburettor Co. Ltd. regarding a modification to cure flat spots and popping in the exhaust. | 26th Apr 1938 | Box 122 \ 2 scan0354 | |
| Letter to The Zenith Carburettor Co. Ltd. regarding a previously sent official order. | 27th Apr 1938 | Box 122 \ 2 scan0355 | |
| Letter to Zenith Carburettor Co. Ltd. detailing two complaints about carburettors on a Phantom III vehicle. | 27th Apr 1938 | Box 122 \ 2 scan0356 | |
| Reinspection and stamping of Zenith carburettors for the Phantom III chassis. | 28th Apr 1938 | Box 122 \ 2 scan0357 | |
| Letter from the Zenith Carburetter Co. Ltd. apologising for an error regarding a previously received order. | 29th Apr 1938 | Box 122 \ 2 scan0358 | |
| Letter from Zenith Carburetter Co. Ltd. responding to a complaint about a Phantom III carburetter. | 29th Apr 1938 | Box 122 \ 2 scan0359 | |
| Letter from The Zenith Carburetter Co. regarding an investigation into a pump with missing holes. | 29th Apr 1938 | Box 122 \ 2 scan0360 | |
| Request to arrange payment for idle jet tubes and a die from the Zenith Carburettor Co. Ltd. | 30th Apr 1938 | Box 122 \ 2 scan0361 | |
| Letter from Zenith Carburetter Co. Ltd discussing a modification to a strangler spindle bearing. | 30th Apr 1938 | Box 122 \ 2 scan0362 | |
| Letter from Zenith Carburetter Co. Ltd. proposing a scheme for a strangler layout on the DC-42 carburetter to relieve pressure from blow back. | 26th Apr 1938 | Box 122 \ 3 scan0001 | |
| Letter from Zenith Carburetter Co. regarding carburetter modifications and the use of a strangler plate. | 26th Apr 1938 | Box 122 \ 3 scan0002 | |
| Functional description for an Automatic Strangler, model DC-42. | 26th Apr 1938 | Box 122 \ 3 scan0003 | |
| Blueprint showing proposed designs for a carburettor case, filter, and half strangles. | 3rd May 1938 | Box 122 \ 3 scan0004 | |
| Letter from Zenith Carburetter Co. Ltd requesting an official order for springs. | 3rd May 1938 | Box 122 \ 3 scan0005 | |
| Official order for carburettor parts from two different suppliers. | 4th May 1938 | Box 122 \ 3 scan0006 | |
| Letter from Zenith Carburetter Co. Ltd. regarding modifications to a 30 HP DC-42 carburetter. | 4th May 1938 | Box 122 \ 3 scan0007 | |
| Letter from the Zenith Carburetter Co. regarding the quantity of carburettors received for modification. | 4th May 1938 | Box 122 \ 3 scan0008 | |
| Letter to Zenith Carburettor Co. Ltd. detailing modifications to the Stromberg D.O.42 carburettor. | 16th May 1938 | Box 122 \ 3 scan0009 | |
| List of modifications to a carburettor, including details of the idle system, choke, and float chamber. | 16th May 1938 | Box 122 \ 3 scan0010 | |
| Apology letter to Zenith Carburettor Co. Ltd. regarding a complaint on two Phantom III carburettors. | 17th May 1938 | Box 122 \ 3 scan0011 | |
| Letter from Zenith Carburetter Co. Ltd regarding brass turnings found in a pump piston. | 20th May 1938 | Box 122 \ 3 scan0012 | |
| Correspondence from The Zenith Carburetter Co. Ltd., this is the second sheet of the letter. | 21th May 1938 | Box 122 \ 3 scan0013 | |
| Letter from The Zenith Carburetter Co. Ltd. discussing the cost and manufacturing of a dual A.A type carburetter for a new 12-cylinder engine. | 23th May 1938 | Box 122 \ 3 scan0014 | |
| Letter from The Zenith Carburetter Co. proposing a plan for manufacturing carburetters. | 23th May 1938 | Box 122 \ 3 scan0015 | |
| Letter to The Zenith Carburettor Co. Ltd. regarding modifications to the D.C.42 Carburettor. | 23th May 1938 | Box 122 \ 3 scan0016 | |
| Letter detailing various modifications and requests regarding carburettor parts and specifications. | 23th May 1938 | Box 122 \ 3 scan0017 | |
| Request for a covering order for 6 main metering jets from the Zenith Carburettor Co. Ltd for test purposes. | 24th May 1938 | Box 122 \ 3 scan0018 | |
| Letter to Zenith Carburettor Co. Ltd. regarding the delivery of modified D.C.42 carburettors and a fault with the originals. | 25th May 1938 | Box 122 \ 3 scan0019 | |
| Letter to The Zenith Carburetter Co. about submitting costs for an A.A. type carburetter, considering manufacturing in the UK versus importing. | 28th May 1938 | Box 122 \ 3 scan0020 | |
| Letter from Zenith Carburetter Co. Ltd. regarding the dispatch of 12 corrected DC-42 carburetters. | 27th May 1938 | Box 122 \ 3 scan0021 | |
| Letter from Zenith Carburetter Co. Ltd. concerning DC-42 carburettors and the despatch of jets. | 31th May 1938 | Box 122 \ 3 scan0022 | |
| Letter from Zenith Carburetter Co Ltd concerning the production and pricing of an A.A. Carburetter. | 31th May 1938 | Box 122 \ 3 scan0023 | |
| Letter from The Zenith Carburetter Co. Ltd. regarding an overlooked request for float springs for a DC-42 carburetter. | 31th May 1938 | Box 122 \ 3 scan0024 | |
| Letter from Zenith Carburetter Co Ltd concerning two modified DC-42 carburetters sent for testing. | 1st Jun 1938 | Box 122 \ 3 scan0025 | |
| Letter from The Zenith Carburetter Co. regarding a cheaper modification to the strangler operating mechanism for two carburetters. | 1st Jun 1938 | Box 122 \ 3 scan0026 | |
| Letter from Zenith Carburetter Co. regarding throttle securing screws on the EEC-42 model. | 1st Jun 1938 | Box 122 \ 3 scan0027 | |
| Telex communication to Palmer Zenicarbur London regarding carburettor specification changes. | 3rd Jun 1938 | Box 122 \ 3 scan0028 | |
| Letter to Zenith Carburetter Co. Ltd. regarding modifications to D.C. 42 T carburetters. | 3rd Jun 1938 | Box 122 \ 3 scan0029 | |
| Letter from Zenith Carburetter Co Ltd regarding a specification amendment for the 'Wraith' engine carburetter by-pass jet. | 3rd Jun 1938 | Box 122 \ 3 scan0030 | |
| Letter from Zenith Carburetter Co. discussing a misunderstanding over 'levers' and 'levels' and seeking clarification on modifications to DC-42 carburetters. | 3rd Jun 1938 | Box 122 \ 3 scan0031 | |
| Letter from The Zenith Carburetter Co. regarding a correction for 'Wraith' carburetters. | 3rd Jun 1938 | Box 122 \ 3 scan0032 | |
| Request to Zenith Carburettor Co. Ltd. to order byepass jets and springs for production and experimental Wraith cars. | 3rd Jun 1938 | Box 122 \ 3 scan0033 | |
| Letter from Zenith Carburetter Co. Ltd. regarding carburetter modifications. | 7th Jun 1938 | Box 122 \ 3 scan0034 | |
| Letter from Zenith Carburetter Co. Ltd. confirming an agreement to lock carburetter throttle screws with solder. | 8th Jun 1938 | Box 122 \ 3 scan0035 | |
| Letter from The Zenith Carburetter Co. Ltd requesting an official order for previously supplied parts. | 8th Jun 1938 | Box 122 \ 3 scan0036 | |
| Letter to Zenith Carburetter Co. Ltd. regarding tests on a modified choke mechanism for D.C. 42 carburetters. | 10th Jun 1938 | Box 122 \ 3 scan0037 | |
| Letter to Zenith Carburetter Co. regarding fuel levels and choke spindles on Wraith and 30 HP carburetters. | 10th Jun 1938 | Box 122 \ 3 scan0038 | |
| Letter detailing modifications for 30 HP carburetters, Wraith models, and throttle screws. | 10th Jun 1938 | Box 122 \ 3 scan0039 | |
| The supply of Stromberg carburettors for the Wraith 'B' Series chassis. | 17th Jun 1938 | Box 122 \ 3 scan0040 | |
| Letter from Zenith Carburetter Co. Ltd. discussing 'Wraith' carburetter specifications and manufacturing. | 18th Jun 1938 | Box 122 \ 3 scan0041 | |
| Letter from Zenith Carburetter Co. regarding drawing revisions and modifications for the 25/30 HP carburetter. | 18th Jun 1938 | Box 122 \ 3 scan0042 | |
| Letter to Zenith Carburetter Co. Ltd. regarding a parts list, a quote for idle system modification, and the dispatch of bypass jets. | 21th Jun 1938 | Box 122 \ 3 scan0043 | |
| Letter from Zenith Carburetter Co. Ltd. regarding a misunderstanding over an order for by-pass jets. | 23th Jun 1938 | Box 122 \ 3 scan0044 | |
| Letter to Zenith Carburetter Co. Ltd. regarding an error with bypass jets and modifications to two other carburetters. | 24th Jun 1938 | Box 122 \ 3 scan0045 | |
| Letter from Zenith Carburetter Co. regarding modifications to a DC-42 carburetter's sticking strangler flap. | 5th Jul 1938 | Box 122 \ 3 scan0046 | |
| Letter to Zenith Carburetter Co. Ltd. regarding the despatch of surplus parts. | 15th Jul 1938 | Box 122 \ 3 scan0047 | |
| The policy and costs of sending faulty Zenith Carburetters to the manufacturer for repair. | 15th Jul 1938 | Box 122 \ 3 scan0048 | |
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