| Description | Date | Identifier | |
| The second page of a letter from The Zenith Carburetter Co. concerning a despatch. | 16th Aug 1937 | Box 122 \ 2 scan0210 | |
| Internal request to place an order with the Zenith Carburetter Co. for a list of specific parts. | 17th Aug 1937 | Box 122 \ 2 scan0211 | |
| Visit from Mr. Turner of the Zenith Carburetter Co. | 17th Aug 1937 | Box 122 \ 2 scan0212 | |
| Requesting a covering order for a Zenith Carburetter part received for testing. | 19th Aug 1937 | Box 122 \ 2 scan0213 | |
| Letter from Zenith Carburetter Co. Ltd. regarding the dispatch of incorrect carburetter jets. | 23th Aug 1937 | Box 122 \ 2 scan0214 | |
| Delivery note from The Zenith Carburetter Co., Ltd. for one sample DC 42 carburetter. | 23th Aug 1937 | Box 122 \ 2 scan0215 | |
| Letter from Zenith Carburetter Co. Ltd discussing the preparation and pricing of carburettors for the Phantom III and 20/25 hp engines. | 24th Aug 1937 | Box 122 \ 2 scan0216 | |
| Page 2 of a letter from The Zenith Carburetter Co. quoting the price for a Twin Carburetter for the Phantom III. | 24th Aug 1937 | Box 122 \ 2 scan0217 | |
| Letter to Zenith Carburetter Co. requesting the revised cost for a Phantom III carburetter with a 25/30 finish. | 26th Aug 1937 | Box 122 \ 2 scan0218 | |
| Letter from Zenith Carburetter Co. Ltd regarding the revised Phantom III Carburetter. | 28th Aug 1937 | Box 122 \ 2 scan0219 | |
| Letter from The Zenith Carburetter Co. Ltd regarding an un-invoiced DC-42 carburetter. | 31th Aug 1937 | Box 122 \ 2 scan0220 | |
| Request for a covering order and payment for a D.C.42 carburettor. | 1st Sep 1937 | Box 122 \ 2 scan0221 | |
| Letter to the Zenith Carburettor Co. Ltd. regarding complaints about sticking choke valves and jamming butterflies. | 14th Sep 1937 | Box 122 \ 2 scan0222 | |
| Letter from Zenith Carburetter Co. Ltd. acknowledging a letter regarding a 30 HP DC-42 carburetter. | 15th Sep 1937 | Box 122 \ 2 scan0223 | |
| Request to fit a Stromberg 30 HP carburettor with one coat of enamel to a Transport car to test paint durability. | 16th Sep 1937 | Box 122 \ 2 scan0224 | |
| Incorrect shipment of carburettor jets from the Zenith Carburetter Co. | 17th Sep 1937 | Box 122 \ 2 scan0225 | |
| Requesting payment instructions for jets and bleeds that are being kept. | 20th Sep 1937 | Box 122 \ 2 scan0226 | |
| Letter from Zenith Carburetter Co. Ltd discussing a cheaper enamel finish on a Phantom III carburetter. | 21th Sep 1937 | Box 122 \ 2 scan0227 | |
| Closing letter from The Zenith Carburetter Co. Ltd. to W. A. Robotham of Derby. | 21th Sep 1937 | Box 122 \ 2 scan0228 | |
| Delivery note from The Zenith Carburetter Co., Ltd. for one carburetter. | 21th Sep 1937 | Box 122 \ 2 scan0229 | |
| Letter to Zenith Carburetter Co. Ltd. detailing required modifications for choke valve clearance issues on 30 HP D.C.42 carburetters. | 22th Sep 1937 | Box 122 \ 2 scan0230 | |
| Letter requesting a supply of accelerator pump pistons for experimentation on the D.C.42 model. | 24th Sep 1937 | Box 122 \ 2 scan0231 | |
| Letter from The Zenith Carburetter Co. Ltd regarding modifications to a DC-42 carburetter. | 24th Sep 1937 | Box 122 \ 2 scan0232 | |
| Letter from The Zenith Carburetter Co. Ltd. regarding accelerator pump pistons being prepared for testing. | 24th Sep 1937 | Box 122 \ 2 scan0233 | |
| Letter to the Zenith Carburetter Co. expressing disappointment with a cost reduction for a carburetter and inquiring about a future test model. | 24th Sep 1937 | Box 122 \ 2 scan0234 | |
| Letter from Zenith Carburetter Co. Ltd. discussing price reductions on Phantom III and 25/30 carburetters. | 25th Sep 1937 | Box 122 \ 2 scan0235 | |
| Letter from Zenith Carburetter Co. regarding the cost-conscious production of carburetters in a special department. | 25th Sep 1937 | Box 122 \ 2 scan0236 | |
| Letter to Zenith Carburetter Co. Ltd. regarding the plating on a choke spindle. | 29th Sep 1937 | Box 122 \ 2 scan0237 | |
| Requesting a covering order for 6 special accelerator pump pistons to be sent to Zenith Carburetter Co. Ltd for testing. | 29th Sep 1937 | Box 122 \ 2 scan0238 | |
| Request to order ten main jets from Zenith Carburetter Co. for test purposes on a Phantom III. | 30th Sep 1937 | Box 122 \ 2 scan0239 | |
| Letter requesting ten main jets of various sizes from The Zenith Carburetter Co. Ltd. | 30th Sep 1937 | Box 122 \ 2 scan0240 | |
| Letter from Zenith Carburetter Co. Ltd regarding modifications to the carburetter idle system. | 4th Oct 1937 | Box 122 \ 2 scan0241 | |
| Page 2 of a letter from The Zenith Carburetter Co. to W. A. Robotham. | 4th Oct 1937 | Box 122 \ 2 scan0242 | |
| Letter to the Zenith Carburettor Co. Ltd. regarding a punctured 30 HP D.C.42 float requiring replacement. | 4th Oct 1937 | Box 122 \ 2 scan0243 | |
| Letter from Zenith Carburetter Co. confirming modifications to a choke spindle and bore housing. | 8th Oct 1937 | Box 122 \ 2 scan0244 | |
| Letter from Zenith Carburetter Co. Ltd. regarding a carburetter float replacement and return. | 8th Oct 1937 | Box 122 \ 2 scan0245 | |
| Letter to the Zenith Carburetter Co. Ltd. acknowledging receipt of a carburetter float and a petrol tank unit. | 11th Oct 1937 | Box 122 \ 2 scan0246 | |
| Letter to The Zenith Carburetter Co. Ltd. acknowledging a change to spindle plating. | 11th Oct 1937 | Box 122 \ 2 scan0247 | |
| Carburetor metering report graph for a type EXV-2 for Dodge, detailing rich and lean limits against air flow. | 1st Oct 1936 | Box 122 \ 2 scan0248 | |
| Service bulletin for the 1937 Buick Stromberg 'AA' Carburetor, detailing adjustments and system operations. | 1st Oct 1936 | Box 122 \ 2 scan0249 | |
| Service Bulletin for the Stromberg 'AA-25' Carburetor for 1937 Cadillac models. | 1st Nov 1936 | Box 122 \ 2 scan0251 | |
| Service bulletin for the Stromberg AA-25 carburetor covering maximum power, acceleration, fuel level, and automatic choke control. | 1st Jan 1937 | Box 122 \ 2 scan0252 | |
| Service bulletin for the Stromberg 'AAOV-1' Carburetor for 1937 Chrysler models. | 1st Jan 1937 | Box 122 \ 2 scan0253 | |
| Service bulletin for a Stromberg carburetor detailing acceleration and fuel level systems with diagrams. | 1st Nov 1936 | Box 122 \ 2 scan0254 | |
| Letter to the Zenith Carburetter Co. regarding idle system improvements for a 30 HP engine to resolve exhaust spitting. | 5th Nov 1937 | Box 122 \ 2 scan0255 | |
| List specifying quantities and modifications for idle jet tubes, metering screws, and springs. | 5th Nov 1937 | Box 122 \ 2 scan0256 | |
| Letter to Zenith Carburetter Co. Ltd. about a flooding issue on the 30 HP D.C.42 carburetter and requesting smaller replacement parts. | 5th Nov 1937 | Box 122 \ 2 scan0257 | |
| Letter from The Zenith Carburetter Co. acknowledging receipt of letters concerning a 30 HP DC-42 carburetter. | 6th Nov 1937 | Box 122 \ 2 scan0258 | |
| Official order for carburettor parts from the Zenith Carburettor Co. Ltd. | 8th Nov 1937 | Box 122 \ 2 scan0259 | |
| Request to place an official order for carburettor parts with Zenith Carburettor Co.Ltd. | 8th Nov 1937 | Box 122 \ 2 scan0260 | |
| Letter to Zenith Carburettor Co. Ltd. regarding amendments and queries on an order for carburettors. | 8th Oct 1937 | Box 122 \ 2 scan0261 | |
| Letter from Zenith Carburetter Co. Ltd returning a modified carburetter they believe was used for experiments. | 9th Nov 1937 | Box 122 \ 2 scan0262 | |
| Page 2 of a letter from The Zenith Carburetter Co. Ltd. | 9th Nov 1937 | Box 122 \ 2 scan0263 | |
| Letter from Zenith Carburetter Co. Ltd. about sending needles and seatings for a 30 HP DC-42 carburetter. | 9th Nov 1937 | Box 122 \ 2 scan0264 | |
| Letter from The Zenith Carburetter Co. Ltd regarding parts for a 30 HP DC-42 carburetter. | 9th Nov 1937 | Box 122 \ 2 scan0265 | |
| Letter from Zenith Carburetter Co. Ltd. clarifying details on an order for 30 HP DC-42 carburettors and parts. | 10th Nov 1937 | Box 122 \ 2 scan0266 | |
| Letter to Zenith Carburettor Co. Ltd. regarding carburettor specifications and service modifications. | 11th Nov 1937 | Box 122 \ 2 scan0267 | |
| Order for 30 Phantom III blank air bleeds from Zenith Carburettor Co. Ltd. | 16th Nov 1937 | Box 122 \ 2 scan0268 | |
| Letter to the Zenith Carburetter Co. Ltd. regarding modifications to accelerator pump pistons and carburetter feed holes. | 16th Nov 1937 | Box 122 \ 2 scan0269 | |
| Letter discussing specifications for carburetter needle seating and main jet sizes. | 16th Nov 1937 | Box 122 \ 2 scan0270 | |
| Letter to the Zenith Carburetter Co. regarding an issue of banging in the silencer on the 25/30 model. | 16th Nov 1937 | Box 122 \ 2 scan0271 | |
| Letter to The Zenith Carburettor Co.Ltd. requesting standardisation alterations for Phantom III carburettors. | 17th Nov 1937 | Box 122 \ 2 scan0272 | |
| Letter from The Zenith Carburetter Co. Ltd. regarding carburetter modifications for a 30 HP Engine. | 18th Nov 1937 | Box 122 \ 2 scan0273 | |
| Letter from Zenith Carburetter Co. regarding needle seating and float specifications for DC-42 carburetters. | 18th Nov 1937 | Box 122 \ 2 scan0274 | |
| Request to order one D.A.V.42 carburettor from the Zenith Carburettor Co. | 18th Nov 1937 | Box 122 \ 2 scan0275 | |
| Letter to The Zenith Carburettor Co. Ltd. requesting a D.A.V.42 carburettor for fuel-economy experiments. | 18th Nov 1937 | Box 122 \ 2 scan0276 | |
| Letter from Zenith Carburetter Co. regarding a 'popping back' issue on 25/30 engines with the DC-42 Carburetter. | 19th Nov 1937 | Box 122 \ 2 scan0277 | |
| Page 2 of a letter from The Zenith Carburetter Co. regarding a difficulty requiring more information. | 19th Nov 1937 | Box 122 \ 2 scan0278 | |
| Letter to Zenith Carburettor Co. Ltd. regarding service modification Rm.467 and confirmation of carburettor seatings. | 19th Nov 1937 | Box 122 \ 2 scan0279 | |
| Letter from Zenith Carburetter Co. Ltd. regarding a DC-42 carburetter for a 30 HP engine. | 22th Nov 1937 | Box 122 \ 2 scan0280 | |
| Letter from Zenith Carburetter Co. Ltd. regarding springs for the Phantom III EEC-42 carburetter. | 22th Nov 1937 | Box 122 \ 2 scan0281 | |
| Letter to Zenith Carburetter Co. Ltd. about modifications to the Phantom III carburetter. | 24th Nov 1937 | Box 122 \ 2 scan0282 | |
| Letter from The Zenith Carburetter Co. Ltd. regarding a piano-wire spring, part no. E.87987. | 26th Nov 1937 | Box 122 \ 2 scan0283 | |
| Letter from The Zenith Carburetter Co. Ltd discussing modifications to carburetters under service order Rm.467. | 26th Nov 1937 | Box 122 \ 2 scan0284 | |
| Letter from The Zenith Carburetter Co. Ltd., being the second sheet. | 26th Nov 1937 | Box 122 \ 2 scan0285 | |
| Letter from Zenith Carburetter Co. Ltd discussing a banging noise in the silencer on over-run. | 27th Nov 1937 | Box 122 \ 2 scan0286 | |
| Letter from Zenith Carburetter Co. to W. A. Robotham regarding carburetter modifications to address a popping issue. | 27th Nov 1937 | Box 122 \ 2 scan0287 | |
| Letter to Zenith Carburettor Co. regarding fuel leaks on Phantom III carburettors. | 29th Nov 1937 | Box 122 \ 2 scan0288 | |
| Letter to The Zenith Carburetter Co. Ltd. regarding modifications to the idle air bleed on a 30 HP carburetter. | 29th Nov 1937 | Box 122 \ 2 scan0289 | |
| List of modifications required for special lever carburetters. | 29th Nov 1937 | Box 122 \ 2 scan0290 | |
| Letter from Zenith Carburetter Co. regarding a suggested modification to the Phantom III EEC-42 carburetter plugs. | 1st Dec 1937 | Box 122 \ 2 scan0291 | |
| Letter to the Zenith Carburettor Co. Ltd. proposing an altered carburettor position to cure engine flooding on gradients. | 7th Dec 1937 | Box 122 \ 2 scan0292 | |
| Letter to Zenith Carburettor Co. Ltd. concerning an investigation into leaking pump jet external plugs on a Phantom III. | 8th Dec 1937 | Box 122 \ 2 scan0293 | |
| Letter from Zenith Carburetter Co. Ltd. regarding proposals for the 30 HP DC-42 carburetter. | 11th Dec 1937 | Box 122 \ 2 scan0294 | |
| Page 2 of a letter from The Zenith Carburetter Co. regarding a technical matter and forwarding it to Mr. Fisher. | 11th Dec 1937 | Box 122 \ 2 scan0295 | |
| Investigation into Stromberg carburetter chokes jamming due to back-firing. | 13th Dec 1937 | Box 122 \ 2 scan0296 | |
| Letter from Zenith Carburetter Co. Ltd. requesting a blueprint for a Phantom III chassis. | 14th Dec 1937 | Box 122 \ 2 scan0297 | |
| Letter to Zenith Carburettor Co. Ltd. regarding a delayed print for a Phantom III E.E.C.42. | 15th Dec 1937 | Box 122 \ 2 scan0298 | |
| Letter to Zenith Carburetter Co. regarding throttle spindle arrangement and choke valve issues on 30HP and Phantom III engine carburettors. | 17th Dec 1937 | Box 122 \ 2 scan0299 | |
| Page 2 of a letter discussing an alternative arrangement for the choke butterfly. | 17th Dec 1937 | Box 122 \ 2 scan0300 | |
| Letter from the Zenith Carburetter Co. Ltd. regarding the dispatch and modification of a DC-42 carburetter. | 18th Dec 1937 | Box 122 \ 2 scan0301 | |
| Letter from Zenith Carburetter Co Ltd regarding a 30 HP DC-42 carburetter, its mounting, and choke mechanism. | 21th Dec 1937 | Box 122 \ 2 scan0302 | |
| Letter from The Zenith Carburetter Co. to Messrs. Rolls-Royce Ltd. regarding a new choke mechanism. | 21th Dec 1937 | Box 122 \ 2 scan0303 | |
| Letter from Zenith Carburetter discussing a fault where a throttle plate screw fell into a Phantom III engine and proposing solutions. | 21th Dec 1937 | Box 122 \ 2 scan0304 | |
| Concluding page of a letter from The Zenith Carburetter Co. regarding making a job safe. | 21th Dec 1937 | Box 122 \ 2 scan0305 | |
| Request to arrange payment for a Stromberg carburettor for a 30 HP model. | 24th Dec 1937 | Box 122 \ 2 scan0306 | |
| Letter to The Zenith Carburettor Co. Ltd. regarding carburettor bench tests, manifold design, and a list of modifications. | 24th Dec 1937 | Box 122 \ 2 scan0307 | |
| Letter discussing modifications to control levers, throttle plates, and the resumption of work after the holidays. | 24th Dec 1937 | Box 122 \ 2 scan0308 | |
| Letter from Zenith Carburetter Co. Ltd. discussing the 30 HP DC-42 carburetter. | 29th Dec 1937 | Box 122 \ 2 scan0309 | |
| New Year's greeting and thank you letter from Zenith Carburetter Co. Ltd. | 31th Dec 1937 | Box 122 \ 2 scan0310 | |
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