| Description | Date | Identifier | |
| Letter from Zenith Carburetter Co. Ltd. regarding arrangements for carburetter tuning. | 24th Jul 1939 | Box 122 \ 3 scan0149 | |
| Request to The Zenith Carburetter Co. for a supply of four AA.25 carburetters with electrically operated chokes. | 24th Jul 1939 | Box 122 \ 3 scan0150 | |
| Order for four Stromberg carburetters from The Zenith Carburetter Co. Ltd. | 24th Jul 1939 | Box 122 \ 3 scan0151 | |
| Letter from Zenith Carburetter Co. Ltd to W.A. Robotham arranging a meeting and confirming travel plans. | 24th Jul 1939 | Box 122 \ 3 scan0152 | |
| Letter from Zenith Carburetter Co. Ltd confirming an order for four AA.25 carburetters with electrically operated chokes. | 25th Jul 1939 | Box 122 \ 3 scan0153 | |
| Request to despatch four sample Stromberg carburettors on loan to The Zenith Carburetter Co. Ltd. | 26th Jul 1939 | Box 122 \ 3 scan0154 | |
| Order to be sent to The Zenith Carburetter Co. Ltd. for two carburettors. | 27th Jul 1939 | Box 122 \ 3 scan0155 | |
| Confirming that replacement parts do not need payment as the originals were returned. | 27th Jul 1939 | Box 122 \ 3 scan0156 | |
| Letter from Zenith Carburetter Co. regarding a delay in providing a price for the Twin Carburetter AA-25. | 31th Jul 1939 | Box 122 \ 3 scan0157 | |
| Concluding page of a letter from The Zenith Carburetter Co. | 31th Jul 1939 | Box 122 \ 3 scan0158 | |
| Letter from Zenith Carburetter Co. Ltd regarding the delivery schedule for A.A-25 carburetters. | 22th Aug 1939 | Box 122 \ 3 scan0159 | |
| Production trial for an automatic start 8-cylinder engine device. | 23th Aug 1939 | Box 122 \ 3 scan0160 | |
| Disadvantages and good points of an electrically operated choke for a Stromberg carburetter. | 23th Aug 1939 | Box 122 \ 3 scan0161 | |
| Comparison of two different electrical fast idle systems for engine cold starting. | 23th Aug 1939 | Box 122 \ 3 scan0162 | |
| Letter to the Zenith Carburetter Co. Ltd. regarding carburetter settings and desired modifications for a six-cylinder engine. | 23th Aug 1939 | Box 122 \ 3 scan0163 | |
| Query about the feasibility of modifying a carburetter for vacuum ignition control without the expense of new dies. | 23th Aug 1939 | Box 122 \ 3 scan0164 | |
| Specifications for a 1939 Cadillac type AAV.26 carburetter used for obtaining road settings. | 24th Aug 1939 | Box 122 \ 3 scan0165 | |
| Clarifying the quantity of jets in an order and addressing excess parts held by Zenith. | 24th Aug 1939 | Box 122 \ 3 scan0166 | |
| Letter from Zenith Carburetter Co. Ltd. regarding an invoice for an AA-25 Carburetter Throttle Body. | 1st Sep 1939 | Box 122 \ 3 scan0167 | |
| Requesting instructions for a covering order to allow payment of an invoice held in abeyance. | 11th Sep 1939 | Box 122 \ 3 scan0168 | |
| Requesting payment authorisation for an invoice from Zenith Carburetter Co. Ltd. for various parts. | 29th Jul 1939 | Box 122 \ 3 scan0169 | |
| Invoice from Zenith Carburetter Co. Ltd. for a carburetter barrel assembly. | 15th Sep 1939 | Box 122 \ 3 scan0170 | |
| Letter from Zenith Carburetter Co. Ltd. regarding an invoice for an AA-25 carburetter. | 9th Oct 1939 | Box 122 \ 3 scan0171 | |
| Letter from the Experimental Department requesting details on induction systems for 10 and 12 HP four-cylinder car engines. | 12th Oct 1939 | Box 122 \ 3 scan0172 | |
| Letter to Zenith Carburetter Co. Ltd. outlining final specification requirements for an A.A. 25 type Stromberg carburetter. | 31th Oct 1939 | Box 122 \ 3 scan0173 | |
| Letter from The Zenith Carburetter Co. Ltd. acknowledging a request for a final specification for the AA.25 Stromberg carburetter. | 1st Nov 1939 | Box 122 \ 3 scan0174 | |
| Requesting the issue of a covering order for a sample carburetter delivered by hand. | 4th Nov 1939 | Box 122 \ 3 scan0175 | |
| Letter to Zenith Carburetter Co. Ltd. requesting information on two modified DC.42 carburetters. | 4th Nov 1939 | Box 122 \ 3 scan0176 | |
| Letter to The Zenith Carburetter Co. Ltd. regarding the specification and order for two special carburetters. | 9th Nov 1939 | Box 122 \ 3 scan0177 | |
| Request to send a covering order to The Zenith Carburetter Co. Ltd. for parts already received. | 27th Nov 1939 | Box 122 \ 3 scan0178 | |
| Letter to The Zenith Carburetter Co. Ltd. regarding the proposed housing for an electrical choke. | 27th Nov 1939 | Box 122 \ 3 scan0179 | |
| Request to place an order for a carburetter already received from The Zenith Carburetter Co. Ltd. | 8th Dec 1939 | Box 122 \ 3 scan0180 | |
| Internal request to place an order for two Choke controls from The Zenith Carburetter Co. Ltd. | 8th Dec 1939 | Box 122 \ 3 scan0181 | |
| Request to Zenith Carburetter Co. Ltd. for two Stromberg Automatic Choke Control units for a cold starting test. | 8th Dec 1939 | Box 122 \ 3 scan0182 | |
| Letter from The Zenith Carburetter Co. Ltd. regarding the dispatch of two Stromberg Automatic Choke Control Units. | 11th Dec 1939 | Box 122 \ 3 scan0183 | |
| Request to issue an order to the Zenith Carburetter Co. to cover a carburetter that has already been received. | 13th Dec 1939 | Box 122 \ 3 scan0184 | |
| Order to be placed with The Zenith Carburetter Co. Ltd. for two modified carburetters. | 18th Dec 1939 | Box 122 \ 3 scan0185 | |
| Letter to Zenith Carburetter Co. Ltd. requesting the supply and modification of two DBV.36 carburetters. | 18th Dec 1939 | Box 122 \ 3 scan0186 | |
| Letter from The Zenith Carburetter Co. Ltd. regarding the preparation and despatch of a 42-VIM-3 Vauxhall type carburetter. | 18th Dec 1939 | Box 122 \ 3 scan0187 | |
| Letter to Zenith Carburetter Co. Ltd. regarding the return of a 42 VIM.3 carburetter. | 22th Dec 1939 | Box 122 \ 3 scan0188 | |
| Letter from Zenith Carburetter Co. Ltd. confirming receipt of an order for two DBV.36 Carburetters. | 20th Dec 1939 | Box 122 \ 3 scan0189 | |
| Letter from The Zenith Carburetter Co. Ltd sending New Year's greetings and thanks for past courtesy. | 30th Dec 1939 | Box 122 \ 3 scan0190 | |
| Despatch request for a carburettor and spare jets to The Zenith Carburetter Co. Ltd. | 30th Dec 1939 | Box 122 \ 3 scan0191 | |
| Letter from Zenith Carburetter Co. Ltd regarding a returned carburettor for which no credit note will be issued. | 3rd Jan 1940 | Box 122 \ 3 scan0192 | |
| Letter requesting chokes and bye-pass jets for a D.B.V. 36 type carburetter from The Zenith Carburetter Co. Ltd. | 4th Jan 1940 | Box 122 \ 3 scan0193 | |
| Letter concerning the rebuilding and troubleshooting of a dual Stromberg carburetter fitted to an 8-cylinder engine. | 4th Jan 1940 | Box 122 \ 3 scan0194 | |
| Request to forward an official order for carburetter chokes and jets to the Zenith Carburetter Co. Ltd. | 5th Jan 1940 | Box 122 \ 3 scan0195 | |
| Letter from Zenith Carburetter Co. Ltd regarding the specification of Stromberg carburetters for 1940 Buick and Cadillac cars. | 2nd Feb 1940 | Box 122 \ 3 scan0196 | |
| Despatch request for a Zenith 30.VIG carburetter to be loaned for examination. | 2nd Feb 1940 | Box 122 \ 3 scan0197 | |
| Letter to Zenith Carburetter Co. Ltd. requesting clarification on carburetter specifications for Buick and Cadillac cars. | 6th Feb 1940 | Box 122 \ 3 scan0198 | |
| Letter inquiring about the lead time for carburetter orders. | 6th Feb 1940 | Box 122 \ 3 scan0199 | |
| Letter from Zenith Carburetter Co. Ltd confirming the dispatch of an AA-1 Carburetter and requesting an official order. | 7th Feb 1940 | Box 122 \ 3 scan0200 | |
| Delivery note from The Zenith Carburetter Co., Ltd. for one carburetter with venturis. | 7th Feb 1940 | Box 122 \ 3 scan0201 | |
| Letter from Zenith Carburetter Co. Ltd. enclosing bulletins for 1940 Buick and Cadillac carburettors. | 8th Feb 1940 | Box 122 \ 3 scan0202 | |
| Letter concerning the ordering of the latest carburettors from America and potential shipping delays. | 8th Feb 1940 | Box 122 \ 3 scan0203 | |
| Order be issued to Zenith Carburettor Co. Ltd for one Type AA-1 Stromberg carburettor. | 12th Feb 1940 | Box 122 \ 3 scan0204 | |
| Letter to Zenith Carburetter Co. Ltd. regarding an order for 6 Cadillac carburettors and forthcoming alteration specifications. | 17th Feb 1940 | Box 122 \ 3 scan0205 | |
| Letter from Zenith Carburetter Co Ltd regarding the latest carburettors used on American cars. | 15th Mar 1940 | Box 122 \ 3 scan0206 | |
| Copy of a letter from Bendix Products Division to Zenith Carburetter Co. regarding carburetor changes for Buick, Cadillac and Packard models. | 29th Feb 1940 | Box 122 \ 3 scan0207 | |
| Specification and tune-up data sheet for the Stromberg AAV-26 Carburetor for 1940 Cadillac models. | 11th Sep 1939 | Box 122 \ 3 scan0208 | |
| Guide on the operation and adjustments of the automatic choke control for a Stromberg carburetor. | 1st Jan 1940 | Box 122 \ 3 scan0209 | |
| Service and operation guide for the Stromberg Carburetor's automatic choke control. | 1st Jan 1940 | Box 122 \ 3 scan0210 | |
| Service replacement parts list and tune-up data for a Stromberg AAV-26 Carburetor. | 2nd Aug 1939 | Box 122 \ 3 scan0211 | |
| General instructions and adjustments for the Delco-Remy Vacuum Starting Switch on 1940 Buick models. | 2nd Aug 1939 | Box 122 \ 3 scan0212 | |
| Operation and adjustment instructions for a Stromberg carburetor switch. | 11th Sep 1939 | Box 122 \ 3 scan0213 | |
| Specification and tune-up data for a Stromberg AAV-26 carburetor for 1940 Cadillac models. | 11th Sep 1939 | Box 122 \ 3 scan0214 | |
| Guide to the general description, operation, and adjustments of a Stromberg Automatic Choke Control carburetor. | 1st Jan 1940 | Box 122 \ 3 scan0215 | |
| Service replacement parts list and tune-up data for the Stromberg AAV-26 Carburetor for 1940 Packard models. | 30th Jul 1939 | Box 122 \ 3 scan0216 | |
| Service and adjustment instructions for a Stromberg carburetor automatic choke control. | 18th Mar 1940 | Box 122 \ 3 scan0217 | |
| Letter to Zenith Carburettors Co. Ltd. acknowledging receipt of details on Buick, Cadillac, and Packard carburettors. | 18th Mar 1940 | Box 122 \ 3 scan0218 | |
| Letter to Zenith Carburettor Co. regarding poor fuel consumption on a Minx car. | 1st Aug 1940 | Box 122 \ 3 scan0219 | |
| Letter from Zenith Carburetter Co. Ltd concerning the unavailability of a Twin Updraught carburetter. | 17th Apr 1940 | Box 122 \ 3 scan0220 | |
| Letter to the Zenith Carburetter Co. requesting two Dual updraught carburettors. | 19th Apr 1940 | Box 122 \ 3 scan0221 | |
| Internal request to place an order with Zenith Carburetter Co. Ltd. for two updraught carburettors. | 19th Apr 1940 | Box 122 \ 3 scan0222 | |
| Letter from The Zenith Carburetter Co. Ltd confirming they are preparing two 36 m/m Twin Updraught Zenith Carburetters. | 25th Apr 1940 | Box 122 \ 3 scan0223 | |
| Letter from Zenith Carburetter Co. Ltd discussing the modification of an A.A.25 Stromberg carburetter. | 4th May 1940 | Box 122 \ 3 scan0224 | |
| Enquiry to The Zenith Carburettor Co. regarding carburettor delivery and availability. | 13th May 1940 | Box 122 \ 3 scan0225 | |
| Letter from Zenith Carburetter Co. regarding the delivery of imported twin-choke carburettors from America. | 15th May 1940 | Box 122 \ 3 scan0226 | |
| Letter from Zenith Carburetter Co. regarding the supply and suitability of twin downdraught carburetters for a smaller engine. | 15th May 1940 | Box 122 \ 3 scan0227 | |
| Letter from The Zenith Carburetter Co. Ltd regarding the arrival of 6 carburetters from America. | 3rd Jul 1940 | Box 122 \ 3 scan0228 | |
| Letter to Zenith Carburetter Co. Ltd. requesting modifications to six dual Strombergs from America. | 5th Jul 1940 | Box 122 \ 3 scan0229 | |
| Letter from Zenith Carburetter Co. Ltd regarding the drawings for a UUR-2 carburetter. | 8th Jul 1940 | Box 122 \ 3 scan0230 | |
| Follow-up memo regarding a Zenith carburetter sent on loan for examination. | 10th Jul 1940 | Box 122 \ 3 scan0231 | |
| The examination and return of a Zenith Carburetter Type 30 V.I.G with no charge incurred. | 23th Jul 1940 | Box 122 \ 3 scan0232 | |
| Letter to the Zenith Carburetter Co. regarding the incorrect Stromberg carburetters received. | 27th Sep 1940 | Box 122 \ 3 scan0233 | |
| Concerning the delivery of incorrect carburettor models from The Zenith Carburetter Co. Ltd. | 2nd Oct 1940 | Box 122 \ 3 scan0234 | |
| Return and re-order of carburetters from Zenith Carburetter Co. Ltd. | 18th Oct 1940 | Box 122 \ 3 scan0235 | |
| Despatch request for two Stromberg carburetters to The Zenith Carburetter Co., Ltd. | 23th Oct 1940 | Box 122 \ 3 scan0236 | |
| Despatch request for one Updraught Zenith Carburetter to Mr. C.H. Fisher. | 23th Oct 1940 | Box 122 \ 3 scan0237 | |
| Letter to The Zenith Carburetter Co., Ltd. detailing modifications for an AAV.25 carburettor. | 10th Jan 1941 | Box 122 \ 3 scan0238 | |
| Letter discussing the interchangeability of throttle bodies and the preparation of special carburettors. | 10th Jan 1941 | Box 122 \ 3 scan0239 | |
| New Year's greeting letter from The Zenith Carburetter Co. Ltd to W. A. Robotham. | 31th Dec 1940 | Box 122 \ 3 scan0240 | |
| Letter from Zenith Carburetter Co. confirming receipt of a UUR-2 carburetter and spare jets from America, requesting an order for dispatch. | 10th Dec 1940 | Box 122 \ 3 scan0241 | |
| Letter from Zenith Carburetter Co. Ltd. regarding dual carburetter specifications and required part numbers. | 8th Jan 1941 | Box 122 \ 3 scan0242 | |
| Notes on carburetter and engine performance, discussing the effects of turning the carburetter to create throttle bias. | 27th Jan 1941 | Box 122 \ 3 scan0243 | |
| Carburettor jet choke size, throttle stall, and acceleration characteristics from a 1941 article. | 27th Jan 1941 | Box 122 \ 3 scan0244 | |
| Diagram and analysis of carburettor fuel mixture behaviour under acceleration and engine tilt. | 27th Jan 1941 | Box 122 \ 3 scan0245 | |
| Analysis of carburettor performance issues, including flat spots and the effects of mounting orientation on various engine types. | 27th Jan 1941 | Box 122 \ 3 scan0246 | |
| Analysis of petrol consumption and throttle distribution related to the Stromberg carburettor. | 27th Jan 1941 | Box 122 \ 3 scan0247 | |
| Letter to the Zenith Carburetter Co. regarding modifications to a choke spindle and lever. | 6th Feb 1941 | Box 122 \ 3 scan0248 | |
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