| Description | Date | Identifier | |
| Letter to the Zenith Carburetter Co. Ltd. clarifying design points for a 48 m/m horizontal carburetter. | 16th Nov 1936 | Box 122 \ 2 scan0110 | |
| The replacement of unreliable fibre washers with aluminium ones in Stromberg carburettors for the Phantom III & 25/30 HP chassis. | 16th Nov 1936 | Box 122 \ 2 scan0111 | |
| Letter to Zenith Carburetter Co. Ltd. requesting the supply of a carburettor and sets of chokes and jets. | 21th Nov 1936 | Box 122 \ 2 scan0112 | |
| Letter to Zenith Carburetter Co. Ltd. clarifying a confusion over a carburetter order. | 28th Nov 1936 | Box 122 \ 2 scan0113 | |
| Request to pass an official order to The Zenith Carburetter Co.Ltd. for a carburetter and chokes. | 21th Nov 1936 | Box 122 \ 2 scan0114 | |
| Letter from Zenith Carburetter Co. Ltd. regarding the readiness and cost savings for a 25 HP carburetter and a twin carburetter model. | 30th Nov 1936 | Box 122 \ 2 scan0115 | |
| Page 2 of a letter from The Zenith Carburetter Co. Limited. | 30th Nov 1936 | Box 122 \ 2 scan0116 | |
| Letter to Zenith Carburetter Co. regarding an underperforming torsion spring and requesting altered springs and by-pass jets for testing. | 9th Dec 1936 | Box 122 \ 2 scan0117 | |
| Request to place an official order with Zenith Carburetter Co. Ltd. for bypass jets and torsion springs. | 10th Dec 1936 | Box 122 \ 2 scan0118 | |
| Request to place an official order for carburetter parts from the Zenith Carburetter Co.,Ltd. | 14th Dec 1936 | Box 122 \ 2 scan0119 | |
| Parts request to Zenith Carburetter Co., Ltd. for carburetter conversion parts. | 14th Dec 1936 | Box 122 \ 2 scan0120 | |
| Letter from Zenith Carburetter Co. Ltd. regarding the supply of six strangler springs for a 30 HP engine. | 15th Dec 1936 | Box 122 \ 2 scan0121 | |
| Letter to the Zenith Carburetter Co. requesting comparative data on vacuum operated spark advance. | 17th Dec 1936 | Box 122 \ 2 scan0122 | |
| Letter to Zenith Carburetter Co. Ltd. regarding float mechanism alterations for the Phantom III carburetter. | 1st Jan 1937 | Box 122 \ 2 scan0123 | |
| Letter to Zenith Carburetter Co. Ltd. regarding a faulty choke valve spring and requesting bypass jets. | 4th Jan 1936 | Box 122 \ 2 scan0124 | |
| Letter from Zenith Carburetter Co. Ltd. concerning carburetter spring requirements, drawings and parts. | 5th Jan 1937 | Box 122 \ 2 scan0125 | |
| Letter from Zenith Carburetter Co. Ltd. acknowledging correspondence regarding an EEC-42 carburetter for a Phantom III engine. | 5th Jan 1937 | Box 122 \ 2 scan0126 | |
| Listing carburetter parts received from the Zenith Carburetter Co. Ltd. | 6th Jan 1937 | Box 122 \ 2 scan0127 | |
| Letter from Zenith Carburetter Co. Ltd regarding the preparation of six sample torsion springs for a Stromberg DC-42 carburetter. | 11th Mar 1937 | Box 122 \ 2 scan0128 | |
| Letter to the Zenith Carburetter Co. Ltd. regarding a 48 H.K. carburetter and spares. | 15th Mar 1937 | Box 122 \ 2 scan0129 | |
| Request to place an official order with Zenith Carburetter Co. Ltd. for various parts. | 1st Feb 1937 | Box 122 \ 2 scan0130 | |
| Request for carburetter parts for Phantom III models sent to The Zenith Carburetter Co. Ltd. | 1st Feb 1937 | Box 122 \ 2 scan0131 | |
| The receipt of 12 springs from Zenith Carburetter Co. and the need to place an order. | 20th Feb 1937 | Box 122 \ 2 scan0132 | |
| Letter from The Zenith Carburetter Co. Ltd. clarifying details regarding an invoice and the dispatch of two batches of springs. | 17th Feb 1937 | Box 122 \ 2 scan0133 | |
| Discrepancy with an invoice from Zenith Carburetter Co. Ltd. for twelve special springs. | 19th Feb 1937 | Box 122 \ 2 scan0134 | |
| Query regarding an invoice from The Zenith Carburetter Co. Ltd. for pistons, as the receiving stores have no record of receipt. | 22th Feb 1937 | Box 122 \ 2 scan0135 | |
| Request to order two complete pump pistons for Phantom III EEC.42 carburetters from the Zenith Carburetter Co. | 25th Feb 1937 | Box 122 \ 2 scan0136 | |
| Letter to The Zenith Carburetter Co. Ltd. regarding the exchange of carburetter parts. | 8th Mar 1937 | Box 122 \ 2 scan0137 | |
| Letter to Zenith Carburetter Co. Ltd. concerning issues with torsion springs and requesting design modifications. | 5th Mar 1937 | Box 122 \ 2 scan0138 | |
| Letter to the Zenith Carburetter Co. regarding difficulties tuning a model 48 HAZ Carburetter at low RPMs. | 1st Mar 1937 | Box 122 \ 2 scan0139 | |
| Official order be placed for a 48 H.K. carburetter from the Zenith Carburetter Co.Ltd. | 15th Mar 1937 | Box 122 \ 2 scan0140 | |
| Letter to The Zenith Carburetter Co. Ltd. regarding a 48 H.K. carburetter and H.A.S. instrument parts. | 15th Mar 1937 | Box 122 \ 2 scan0141 | |
| Performance test results comparing a standard Phantom III Stromberg Carburetter with a modified version featuring a reduced float ratio. | 18th Mar 1937 | Box 122 \ 2 scan0142 | |
| Sending carburetter parts for exchange with The Zenith Carburetter Co. Ltd. | 22th Mar 1937 | Box 122 \ 2 scan0143 | |
| Request to issue an official order for 6 torsion springs for a 30 HP Stromberg Carburetter. | 1st Apr 1937 | Box 122 \ 2 scan0144 | |
| Letter to Zenith Carburetter Co. Ltd. regarding a failed Phantom III pump piston. | 8th Apr 1937 | Box 122 \ 2 scan0145 | |
| Letter from Zenith Carburetter Co. regarding a failed ball valve and the despatch of a replacement part. | 10th Apr 1937 | Box 122 \ 2 scan0146 | |
| Letter to Zenith Carburetter Co. Ltd. requesting a print for a choke valve torsion spring. | 21th Apr 1937 | Box 122 \ 2 scan0147 | |
| Letter from the Zenith Carburetter Co. Ltd. enclosing a print of spring P.17068. | 22th Apr 1937 | Box 122 \ 2 scan0148 | |
| Letter from the Experimental Department to Zenith Carburetter Co. Ltd. requesting the manufacture of twelve torsion springs. | 5th May 1937 | Box 122 \ 2 scan0149 | |
| Letter from The Zenith Carburetter Co. Ltd. querying a discrepancy on drawing E.61387 for torsion springs. | 10th May 1937 | Box 122 \ 2 scan0150 | |
| Letter to The Zenith Carburetter Co. Ltd. clarifying dimensions on drawing E.61387. | 13th May 1937 | Box 122 \ 2 scan0151 | |
| Letter from The Zenith Carburetter Co. Ltd enclosing drawings for modifications to the EE-3 carburetter. | 11th May 1937 | Box 122 \ 2 scan0152 | |
| Letter to The Zenith Carburetter Co. Ltd. regarding the return of drawings. | 22th May 1937 | Box 122 \ 2 scan0153 | |
| Letter from Zenith Carburetter Co. Ltd acknowledging the return of three prints. | 27th May 1937 | Box 122 \ 2 scan0154 | |
| Letter to Zenith Carburetter Co. discussing carburetter issues and proposed modifications for the Phantom III. | 31th May 1937 | Box 122 \ 2 scan0155 | |
| Order for Phantom III carburettor parts from the Zenith Carburettor Co. Ltd. | 1st Jun 1937 | Box 122 \ 2 scan0156 | |
| Letter to Zenith Carburettor Co. Ltd. regarding a faulty float needle on an E.E.C.42 Stromberg carburettor. | 1st Jun 1937 | Box 122 \ 2 scan0157 | |
| Letter from The Zenith Carburetter Co. Ltd regarding a modified carburetter for the Phantom III. | 1st Jun 1937 | Box 122 \ 2 scan0158 | |
| The second page of a letter from The Zenith Carburetter Co. Limited concerning a costly matter. | 1st Jun 1937 | Box 122 \ 2 scan0159 | |
| Invoice from Zenith Carburetter Co. Ltd. for two different carburettors and a handwritten query about the price difference. | 1st Jun 1937 | Box 122 \ 2 scan0160 | |
| Letter from The Zenith Carburetter Co. Ltd. regarding an invoice for two carburetters. | 28th May 1937 | Box 122 \ 2 scan0161 | |
| Letter from Zenith Carburetter Co. acknowledging a flooding issue on an EEC-42 carburetter. | 4th Jun 1937 | Box 122 \ 2 scan0162 | |
| Seeking payment approval for an invoice for Torsion Springs from Zenith Carburetter Co. Ltd. | 5th Jun 1937 | Box 122 \ 2 scan0163 | |
| Complaint to Zenith Carburettor Co. Ltd. about a manufacturing burr on the float needle seating of a Stromberg carburettor. | 7th Jun 1937 | Box 122 \ 2 scan0164 | |
| Letter from the Zenith Carburetter Co. Ltd. enclosing a Service Bulletin for an AA Stromberg carburetter. | 7th Jun 1937 | Box 122 \ 2 scan0165 | |
| Letter to the Zenith Carburettor Co. Ltd. regarding an invoice and requesting a price analysis for two carburettors. | 8th Jun 1937 | Box 122 \ 2 scan0166 | |
| Letter from Zenith Carburetter Co. Ltd regarding the finish of float needle seatings on a Stromberg carburetter. | 9th Jun 1937 | Box 122 \ 2 scan0167 | |
| Request to place an official order with Zenith Carburettor Co. Ltd. for 12 torsion springs. | 11th Jun 1937 | Box 122 \ 2 scan0168 | |
| Letter from Zenith Carburetter Co. Ltd regarding an invoice error and pricing for two sample A.A. Carburetters. | 11th Jun 1937 | Box 122 \ 2 scan0169 | |
| Letter from The Zenith Carburetter Co. to Rolls-Royce Ltd, Derby. | 11th Jun 1937 | Box 122 \ 2 scan0170 | |
| Letter from The Zenith Carburetter Co. Ltd to W. A. Robotham arranging a meeting. | 11th Jun 1937 | Box 122 \ 2 scan0171 | |
| Letter to T.L. Turner of The Zenith Carburetter Co., Ltd. proposing a meeting date in Derby. | 14th Jun 1937 | Box 122 \ 2 scan0172 | |
| Letter from Zenith Carburetter Co Ltd confirming travel arrangements for a meeting. | 15th Jun 1937 | Box 122 \ 2 scan0173 | |
| Issues with a Stromberg butterfly choke and leaks from a 25/30 float chamber carburetter. | 18th Jun 1937 | Box 122 \ 2 scan0174 | |
| Urgent internal request to order carburettor parts from Zenith Carburettor Co. Ltd. | 18th Jun 1937 | Box 122 \ 2 scan0175 | |
| Letter to the Zenith Carburetter Co. summarizing proposals for carburetter costs and supply. | 18th Jun 1937 | Box 122 \ 2 scan0176 | |
| Letter to the Zenith Carburetter Co. summarising proposals for carburetter costs, supply, and modifications. | 18th Jun 1937 | Box 122 \ 2 scan0177 | |
| Letter from The Zenith Carburetter Co. Ltd. thanking for a meeting to discuss carburettors. | 18th Jun 1937 | Box 122 \ 2 scan0178 | |
| Letter from Zenith Carburetter Co. Ltd requesting a formal order for a consignment of jets. | 18th Jun 1937 | Box 122 \ 2 scan0179 | |
| Requesting an official order for carburettor parts from Zenith Co. Ltd. | 22th Jun 1937 | Box 122 \ 2 scan0180 | |
| Credit note received from Zenith Carburetter Co.Ltd. for a price reduction on two carburettors. | 22th Jun 1937 | Box 122 \ 2 scan0181 | |
| Letter to The Zenith Carburettor Co. Ltd. regarding flooding issues with Phantom III E.E.C.42 Carburettors. | 23th Jun 1937 | Box 122 \ 2 scan0182 | |
| Letter from Zenith Carburetter Co. Ltd concerning flooding on Phantom III carburetters. | 24th Jun 1937 | Box 122 \ 2 scan0183 | |
| Confirming an invoice from Zenith Carburetter Co. is approved and requesting a covering order for two carburetters. | 25th Jun 1937 | Box 122 \ 2 scan0184 | |
| Urgent request to order carburettor parts for a Phantom III from the Zenith Carburettor Co. Ltd. | 26th Jun 1937 | Box 122 \ 2 scan0185 | |
| Correcting an error about a credit from the Zenith Carburetter Co for AA2 and AA25 Carburetters. | 28th Jun 1937 | Box 122 \ 2 scan0186 | |
| Letter to Zenith Carburettor Co. Ltd. regarding choke butterfly damage on D.C.42 30 HP carburettors during cold engine operation. | 30th Jun 1937 | Box 122 \ 2 scan0187 | |
| Letter from Zenith Carburetter Co. Ltd. regarding the EEC-42 carburetter for the Phantom-3. | 5th Jul 1937 | Box 122 \ 2 scan0188 | |
| Incorrectly sized carburettor needle seatings received from Zenith Carburettor Co. Ltd. | 6th Jul 1937 | Box 122 \ 2 scan0189 | |
| Letter to Zenith Carburettor Co. regarding a modification to the Phantom III E.E.C.42 carburettors. | 7th Jul 1937 | Box 122 \ 2 scan0190 | |
| Letter to Zenith Carburetter Co. regarding fuel economy tests and D.C.42 carburettor settings. | 8th Jul 1937 | Box 122 \ 2 scan0191 | |
| Letter from Zenith Carburetter Co. Ltd. regarding the adoption of a high-pressure pump and new seatings for Phantom III EEC-42 carburetters. | 9th Jul 1937 | Box 122 \ 2 scan0192 | |
| Letter from Zenith Carburetter Co. Ltd. discussing a damage complaint regarding DC-42 30 HP carburetters. | 9th Jul 1937 | Box 122 \ 2 scan0193 | |
| Letter to the Zenith Carburetter Co. Ltd. regarding changes to the float needle seating for the Phantom III carburetter. | 9th Jul 1937 | Box 122 \ 2 scan0194 | |
| Letter from Zenith Carburetter Co. enclosing blueprints for Phantom III EEC-42 carburetter parts. | 12th Jul 1937 | Box 122 \ 2 scan0195 | |
| Letter from Zenith Carburetter Co. regarding a flooding issue with an EEC.42 carburetter and proposed solutions. | 14th Jul 1937 | Box 122 \ 2 scan0196 | |
| Technical telex message regarding a fix for carburettor flooding by polishing the needle. | 13th Jul 1937 | Box 122 \ 2 scan0197 | |
| Letter to Zenith Carburettor Co. regarding float needle seating for a Phantom III E.E.C.42 carburettor. | 14th Jul 1937 | Box 122 \ 2 scan0198 | |
| Fuel flow figures and demand for a 30 HPD.C. 42 carburettor. | 15th Jul 1937 | Box 122 \ 2 scan0199 | |
| Letter from Zenith Carburetter Co. Ltd enclosing blueprints and a sample .140' needle valve assembly for approval. | 15th Jul 1937 | Box 122 \ 2 scan0200 | |
| Letter to Zenith Carburettor Co. Ltd. confirming an order for float needle seatings for a Phantom III. | 15th Jul 1937 | Box 122 \ 2 scan0201 | |
| Letter from Zenith Carburetter Co. Ltd. regarding the production of carburettors for the Phantom III. | 16th Jul 1937 | Box 122 \ 2 scan0202 | |
| Letter to Zenith Carburetter Co. Ltd. regarding carburetter needles, seatings, and surplus stock for a Phantom III. | 16th Jul 1937 | Box 122 \ 2 scan0203 | |
| Requesting payment for two Phantom III carburetters received from the Zenith Carburetter Co. | 27th Jul 1937 | Box 122 \ 2 scan0204 | |
| Letter from The Zenith Carburetter Co. Ltd regarding the price and delivery of a Zenith mileage tester. | 27th Jul 1937 | Box 122 \ 2 scan0205 | |
| Letter to The Zenith Carburetter Co. requesting assistance with metering a new Ph.III carburetter. | 4th Aug 1937 | Box 122 \ 2 scan0206 | |
| Letter to Zenith Carburetter Co. Ltd. requesting a range of carburettor parts for fuel economy research on the 25/30 car. | 6th Aug 1937 | Box 122 \ 2 scan0207 | |
| Letter from Zenith Carburetter Co. Ltd. regarding a request for a list of jets for the 25/30 HP engine. | 12th Aug 1937 | Box 122 \ 2 scan0208 | |
| Letter from Zenith Carburetter Co. Ltd detailing a range of jets and parts for a DC-42 carburetter. | 16th Aug 1937 | Box 122 \ 2 scan0209 | |
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