| Description | Date | Identifier | |
| Simple shield to prevent petrol spillage from the Stromberg carburetter onto the ventilated dynamo. | 27th Apr 1936 | Box 122 \ 2 scan0010 | |
| Reliability of the Stromberg carburettor on the 25/30 HP Chassis 'L2' Series. | 27th Apr 1936 | Box 122 \ 2 scan0011 | |
| Letter to Zenith Carburetter Co. Ltd. regarding accelerator pumps and throttle mixture weakness for Phantom III carburettors. | 27th Apr 1936 | Box 122 \ 2 scan0012 | |
| Inspection report on Stromberg DC.42 carburetter floats and choke valve torsion springs. | 30th Apr 1936 | Box 122 \ 2 scan0013 | |
| Stromberg carburettor complaints and failures on part throttle acceleration for the 25/30 HP production model. | 30th Apr 1936 | Box 122 \ 2 scan0014 | |
| Instructions regarding a safeguard shield for carburetter adjustments and a new dynamo end cover design. | 2nd May 1936 | Box 122 \ 2 scan0015 | |
| Request to place an official order for Main Metering Jets for Stromberg Carburetters. | 4th May 1936 | Box 122 \ 2 scan0016 | |
| Request to The Zenith Carburetter Co. Ltd. for a supply of various jets for the Experimental Test Department. | 4th May 1936 | Box 122 \ 2 scan0017 | |
| Letter from Zenith Carburetter Co. Ltd. confirming an order, despatch, and price for main metering jets for EE3 and DC.42 carburetters. | 7th May 1936 | Box 122 \ 2 scan0018 | |
| Requesting an official order be placed with the Zenith Carburetter Co. for chokes. | 9th May 1936 | Box 122 \ 2 scan0019 | |
| Letter requesting the supply of different sized chokes from the Zenith Carburetter Co. Ltd. | 8th May 1936 | Box 122 \ 2 scan0020 | |
| Invoice from Zenith Carburetter Co. for accelerator pumps, seeking authorisation for payment. | 9th May 1936 | Box 122 \ 2 scan0021 | |
| Official order for two EE3 Accelerator Pumps from the Zenith Carburetter Co. Ltd. | 11th May 1936 | Box 122 \ 2 scan0022 | |
| Letter from The Zenith Carburetter Co. Ltd. regarding carburetter specifications for the Phantom III engine. | 18th May 1938 | Box 122 \ 2 scan0023 | |
| Letter from Zenith Carburetter Co. Ltd. regarding a provisional setting for the EEC.3 carburetter. | 13th May 1936 | Box 122 \ 2 scan0024 | |
| List of provisional settings for the EEC-42 carburetter for a Phantom III. | 13th May 1936 | Box 122 \ 2 scan0025 | |
| Requesting confirmation from Mr Radclyffe on the correct specification setting for a carburetter. | 19th May 1936 | Box 122 \ 2 scan0026 | |
| Cover letter forwarding correspondence about Phantom III carburettors from The Zeneth Carburetter Co. | 19th May 1936 | Box 122 \ 2 scan0027 | |
| Visit from a Stromberg Carburetter Co. representative regarding carburetter development for the 20/25 and Ph.III models. | 20th May 1936 | Box 122 \ 2 scan0028 | |
| Letter to Zenith Carburetter Co. Ltd. regarding provisional settings for the Phantom III carburetter. | 22th May 1936 | Box 122 \ 2 scan0029 | |
| Test report on the 33-EX Stromberg carburettor to resolve 'luffing' issues. | 26th Jun 1936 | Box 122 \ 2 scan0030 | |
| Letter to Zenith Carburetter Co. Ltd. regarding a specification update for the Phantom III carburetter concerning float needle movement. | 28th May 1936 | Box 122 \ 2 scan0031 | |
| Specifications for a gland spring for the Phantom III Stromberg carburetter. | 3rd Jun 1936 | Box 122 \ 2 scan0032 | |
| Letter to The Zenith Carburetter Co. Ltd. confirming specifications for the Phantom III carburetters. | 3rd Jun 1936 | Box 122 \ 2 scan0033 | |
| Letter to Zenith Carburetter Co. Ltd. about a production issue with Phantom III carburetter pump pistons. | 9th Jun 1936 | Box 122 \ 2 scan0034 | |
| Letter discussing carburetter jet failures and requesting experimental replacement models. | 9th Jun 1936 | Box 122 \ 2 scan0035 | |
| Letter from Zenith Carburetter Co. Ltd regarding modifications to Phantom III Carburetters. | 13th Jun 1936 | Box 122 \ 2 scan0036 | |
| Letter from The Zenith Carburetter Co. regarding the preparation and despatch of two carburetters. | 13th Jun 1936 | Box 122 \ 2 scan0037 | |
| Letter from Zenith Carburetter Co. Ltd. regarding the supply of unfinished carburettors for experimental purposes. | 16th Jun 1936 | Box 122 \ 2 scan0038 | |
| Letter to Zenith Carburetter Co. Ltd. regarding the production finish and delivery of experimental Phantom III carburetters. | 18th Jun 1936 | Box 122 \ 2 scan0039 | |
| Letter to The Zenith Carburetter Co. Ltd. regarding the dispatch of a Phantom III Carburetter for a flow model. | 18th Jun 1936 | Box 122 \ 2 scan0040 | |
| Requesting the despatch of one Phantom III carburetter to the Zenith Carburetter Co. | 18th Jun 1936 | Box 122 \ 2 scan0041 | |
| Letter from The Zenith Carburetter Co. Ltd concerning the production and supply of experimental carburettors for the Phantom III engine. | 20th Jun 1936 | Box 122 \ 2 scan0042 | |
| Letter to Zenith Carburetter Co. Ltd. complaining about carburettors being supplied to production before samples have been submitted. | 23th Jun 1936 | Box 122 \ 2 scan0043 | |
| Letter discussing the machining of carburetter stops and the urgent need for them for experimental use. | 24th Jun 1936 | Box 122 \ 2 scan0044 | |
| Letter to Zenith Carburetter Co. regarding needle movement and fuel flow issues on Phantom III carburetters. | 24th Jun 1936 | Box 122 \ 2 scan0045 | |
| Letter from Zenith Carburetter Co. Ltd regarding modifications to the carburetter for the Phantom III engine. | 25th Jun 1936 | Box 122 \ 2 scan0046 | |
| Letter from The Zenith Carburetter Co. Ltd. confirming the dispatch of two carburetters. | 26th Jun 1936 | Box 122 \ 2 scan0047 | |
| Letter confirming an order for two experimental carburetters from The Zenith Carburetter Co. Ltd. | 29th Jun 1936 | Box 122 \ 2 scan0048 | |
| Potential fire risk from loose jet pipes on the Stromberg Carburetter and proposing a design change. | 30th Jun 1936 | Box 122 \ 2 scan0049 | |
| Requesting the manufacture of 12 plugs to drawing Rm.129 for Stromberg Carburetters. | 30th Jun 1936 | Box 122 \ 2 scan0050 | |
| Letter to Zenith Carburetter Co. Ltd. requesting a Phantom III Carburetter Throttle Spindle. | 1st Jul 1936 | Box 122 \ 2 scan0051 | |
| Official order for a Ph.III Throttle Spindle from Zenith Carburetter Co. Ltd. | 1st Jul 1936 | Box 122 \ 2 scan0052 | |
| Letter to Zenith Carburetter Co. Ltd. chasing an overdue order for two Phantom III carburetters. | 7th Jul 1936 | Box 122 \ 2 scan0053 | |
| Requesting an official order for two EEC-42 Carburetters for experimental use on a Phantom III. | 8th Jul 1936 | Box 122 \ 2 scan0054 | |
| Official order for two Accelerator Pumps for EE-3 type Stromberg carburettors. | 11th Jul 1936 | Box 122 \ 2 scan0055 | |
| Letter to Zenith Carburetter Co. Ltd. regarding an issue with leather washers jamming in Phantom III accelerator pumps. | 11th Jul 1936 | Box 122 \ 2 scan0056 | |
| Letter to Zenith Carburetter Co. Ltd. regarding modifications to jet plugs and float pivot pins. | 14th Jul 1936 | Box 122 \ 2 scan0057 | |
| Instruction regarding the 30 HP Stromberg Carburetter, advising depots to check a float chamber screw and announcing a future modification. | 8th Aug 1930 | Box 122 \ 2 scan0058 | |
| Letter to Zenith Carburetter Co. Ltd. regarding failures on the Ph.III carburetter accelerator pumps. | 21th Aug 1936 | Box 122 \ 2 scan0059 | |
| Telegram chasing the despatch of two DA-42 carburetters ordered on August sixth. | 23th Aug 1935 | Box 122 \ 2 scan0060 | |
| Letter to Zenith Carburetter Co. regarding sticking and failing Phantom III accelerator pumps. | 3rd Sep 1936 | Box 122 \ 2 scan0061 | |
| Letter discussing pump failures on the Phantom III, raising technical questions and requesting experimental parts. | 3rd Sep 1936 | Box 122 \ 2 scan0062 | |
| Complaints and proposed solutions for issues with Stromberg carburetters. | 4th Sep 1936 | Box 122 \ 2 scan0063 | |
| Jamming issue with the Phantom III Carburetter Accelerator Pump Plunger and providing specifications for a new spring to resolve the problem. | 11th Sep 1936 | Box 122 \ 2 scan0064 | |
| List of required improvements for the Stromberg Carburetter D.C. 42. | 11th Sep 1936 | Box 122 \ 2 scan0065 | |
| Letter from Zenith Carburetter Co. Ltd. regarding the dispatch of two modified all-metal pumps and lever arms. | 17th Sep 1936 | Box 122 \ 2 scan0066 | |
| Stiffening the main spigot on a 25/30 HP Stromberg carburetter to prevent distortion. | 17th Sep 1936 | Box 122 \ 2 scan0067 | |
| Complaints and tests conducted on Stromberg Carburetter D.C.42 jets at Cricklewood, London. | 19th Sep 1936 | Box 122 \ 2 scan0068 | |
| Solution for jamming accelerator pump leathers. | 21th Sep 1936 | Box 122 \ 2 scan0069 | |
| Request to place an official order with Zenith Carburetter Co. for metering jets and ball restriction valves. | 25th Sep 1936 | Box 122 \ 2 scan0070 | |
| Letter to The Zenith Carburetter Co. regarding Mr. Ratcliffe's notes on the Stromberg carburetter. | 28th Sep 1936 | Box 122 \ 2 scan0071 | |
| Instructions for adjusting a 30 HP Stromberg Carburetter to address weakness at part throttle. | 26th Sep 1936 | Box 122 \ 2 scan0072 | |
| Ovality issues with the air intake extension on 25/30 HP Stromberg carburetters. | 1st Oct 1936 | Box 122 \ 2 scan0073 | |
| Requesting an official order for two metal accelerator pumps from the Zenith Carburettor Company. | 5th Oct 1936 | Box 122 \ 2 scan0074 | |
| Stuck choke valve on a 25/30 HP Stromberg Carburetter, requesting a sample. | 5th Oct 1936 | Box 122 \ 2 scan0075 | |
| Faults and cures for the 30 HP Stromberg Carburetter. | 7th Oct 1936 | Box 122 \ 2 scan0076 | |
| Letter from The Zenith Carburetter Co. Ltd confirming recommendations will be incorporated in the next carburetter delivery for the 30 HP engine. | 8th Oct 1936 | Box 122 \ 2 scan0077 | |
| 30 HP carburettor complaint, specifically a weak spot at 48-50 MPH, and the solution involving a new jet. | 10th Oct 1936 | Box 122 \ 2 scan0078 | |
| Letter to Zenith Carburetter Co. returning 5 main jets for inspection as they are under the flow limit. | 12th Oct 1936 | Box 122 \ 2 scan0079 | |
| Breakdown and description of the components for a Stromberg DA-42 and DB-42 carburetter. | 15th Oct 1936 | Box 122 \ 2 scan0080 | |
| Advice note from the Zenith Carburetter Co. for S.829 Metering Jets. | 16th Oct 1936 | Box 122 \ 2 scan0081 | |
| Letter from Zenith Carburetter Co. Ltd. detailing the test results of returned carburettor jets. | 17th Oct 1936 | Box 122 \ 2 scan0082 | |
| Invoice for L829 Metering Jets from Zenith Carburetter Co. Ltd. | 20th Oct 1936 | Box 122 \ 2 scan0083 | |
| Instruction to place an official order with the Zenith Carb. Co. for L289 Metering Jets. | 21th Oct 1936 | Box 122 \ 2 scan0084 | |
| Requesting a revised order for Metering Jets due to a pricing error. | 24th Oct 1936 | Box 122 \ 2 scan0085 | |
| Requesting an official order for 5 Metering Jets from the Zenith Carburetter Co., which cancels a previous memo. | 26th Oct 1936 | Box 122 \ 2 scan0086 | |
| Letter to The Zenith Carburetter Co. Ltd. regarding the return of faulty main jets for inspection and replacement. | 26th Oct 1936 | Box 122 \ 2 scan0087 | |
| Letter to the Zenith Carburetter Co. regarding a complaint of a loose float needle valve in a 30 HP car. | 28th Oct 1936 | Box 122 \ 2 scan0088 | |
| Letter from Zenith Carburetter Co. Ltd discussing the flow test results of main jets. | 28th Oct 1936 | Box 122 \ 2 scan0089 | |
| Page 2 of a letter from The Zenith Carburetter Co. concerning faulty and replacement carburetter jets. | 28th Oct 1936 | Box 122 \ 2 scan0090 | |
| Letter from Zenith Carburetter Co. Ltd. regarding an issue with the carburettor for a 30 HP engine. | 29th Oct 1936 | Box 122 \ 2 scan0091 | |
| Letter from Zenith Carburetter Co. Ltd. regarding a part complaint and a proposed modification. | 30th Oct 1936 | Box 122 \ 2 scan0092 | |
| Official order for three chokes from Zenith Carburetter Co.Ltd. | 30th Oct 1936 | Box 122 \ 2 scan0093 | |
| Request to Zenith Carburetter Co. Ltd. for various sized chokes for carburettor model UHY, size 42. | 20th Oct 1936 | Box 122 \ 2 scan0094 | |
| The postponement of a visit from the Zenith Carburetter Company. | 3rd Nov 1936 | Box 122 \ 2 scan0095 | |
| Letter to Zenith Carburetter Co. Ltd. regarding a failed accelerator pump piston and choke control alignment issues. | 3rd Nov 1936 | Box 122 \ 2 scan0096 | |
| Second page of a letter mentioning an enclosed sketch of a fault. | 4th Nov 1936 | Box 122 \ 2 scan0097 | |
| Copy invoice from S.U. Carburetter Co. Ltd. for a Bentley Dual Pressure Pump. | 4th Nov 1936 | Box 122 \ 2 scan0098 | |
| Letter to W.A. Robotham regarding a non-standard pump from a Bentley car that has failed and been replaced. | 27th Jun 1936 | Box 122 \ 2 scan0099 | |
| The comparative costs of Stromberg and S.U. carburettors and the exploration of alternative suppliers. | 4th Nov 1936 | Box 122 \ 2 scan0100 | |
| Query regarding high throttle spring pressure and a noise on a GAE-20 Stromberg carburettor. | 5th Nov 1936 | Box 122 \ 2 scan0101 | |
| Letter from Zenith Carburetter Co. Ltd regarding an order for screws and existing stock levels. | 5th Nov 1936 | Box 122 \ 2 scan0102 | |
| Blueprint detailing the removal of screwdriver slots from the set screws of a Phantom III carburettor float chamber lid. | 4th Nov 1936 | Box 122 \ 2 scan0103 | |
| The removal of screw driver slots in the set screws of the Phantom III Carburetter float chamber lids. | 31th Oct 1936 | Box 122 \ 2 scan0104 | |
| Design modification for the Phantom III Carburetter, specifically the deletion of screwdriver slots in set screws. | 6th Nov 1936 | Box 122 \ 2 scan0105 | |
| Letter to The Zenith Carburetter Co. Ltd. requesting the value of screws in stock. | 9th Nov 1936 | Box 122 \ 2 scan0106 | |
| Letter from Zenith Carburetter Co. Ltd regarding the works cost for a stock of screws, with handwritten annotations. | 12th Nov 1936 | Box 122 \ 2 scan0107 | |
| Letter to The Zenith Carburetter Co. Ltd. requesting details on alternative carburetters. | 12th Nov 1936 | Box 122 \ 2 scan0108 | |
| The Stromberg carburetter needle valve seat working loose on Phantom III & 25/30HP models and a suggested fix. | 13th Nov 1936 | Box 122 \ 2 scan0109 | |
| | | | |
