| Description | Date | Identifier | |
| Development work and improvements for Spectre carburetters. | 13th Feb 1938 | Box 102 \ 1 scan0263 | |
| Carburetter design flaws, including flooding and throttle synchronisation issues. | 13th Feb 1935 | Box 102 \ 1 scan0264 | |
| Better petrol consumption figures from reversed throttle carburetters compared to the standard 20/25 type. | 14th Feb 1935 | Box 102 \ 1 scan0265 | |
| Petrol consumption for vehicle 20-G-IV, comparing two carburettor configurations. | 12th Feb 1935 | Box 102 \ 1 scan0266 | |
| Comparing petrol consumption test results for different carburettor setups on the 20-G-IV chassis. | 12th Feb 1935 | Box 102 \ 1 scan0267 | |
| Test report comparing petrol consumption between a new modified carburettor and an old type carburettor on car 20-C-IV. | 19th Feb 1935 | Box 102 \ 1 scan0268 | |
| Petrol consumption tests on a 20-G-IV model with a modified carburetter. | 25th Feb 1935 | Box 102 \ 1 scan0269 | |
| Inquiry regarding modifications to the 20/25 carburetter to improve consumption. | 25th Feb 1935 | Box 102 \ 1 scan0270 | |
| Modification to the 20/25 HP Carburetter to resolve hesitation on pick-up. | 27th Feb 1935 | Box 102 \ 1 scan0271 | |
| Standardisation of a carburetter modified to LEC.4292 to address float chamber balance variations. | 29th Jan 1935 | Box 102 \ 1 scan0272 | |
| Cost estimate for extra jigs, tools, and equipment, including a cost comparison between an old and a new part. | 18th Feb 1935 | Box 102 \ 1 scan0273 | |
| Carburettor modifications for the 20/25 HP car to improve petrol consumption. | 27th Feb 1935 | Box 102 \ 1 scan0274 | |
| Modification schedule for 20/25 HP carburetters and addressing hesitation issues in the 40/50 carburetter. | 2nd Mar 1935 | Box 102 \ 1 scan0275 | |
| Carburettor modifications and related arrangements for 20/25 HP and 40/50 HP models. | 6th Mar 1935 | Box 102 \ 1 scan0276 | |
| Carburettors for the 20/25 HP and Phantom models, consumption figures, and an investigation into a 40/50 model's hesitation issue. | 7th Mar 1935 | Box 102 \ 1 scan0277 | |
| Carburetor comparisons for the 20/25 HP and Phantom models, and arranging a viewing for the 40/50 HP car. | 8th Mar 1935 | Box 102 \ 1 scan0278 | |
| Graph plotting the effect on engine power output (B.HP vs R.P.M.) of a tank carburettor and air intake silencer. | 26th Mar 1935 | Box 102 \ 1 scan0279 | |
| Note regarding investigations into carburettor flooding on a 20/25 HP chassis. | 26th Mar 1935 | Box 102 \ 1 scan0280 | |
| Request regarding the development of induction pipes for the 20/25 and Bentley models. | 4th Apr 1935 | Box 102 \ 1 scan0281 | |
| Test report on a downdraught twin Solex carburettor with a central water-heated manifold. | 7th May 1935 | Box 102 \ 1 scan0282 | |
| Reputational damage and a serious customer complaint regarding carburettors on the 20/25 HP car. | 17th May 1935 | Box 102 \ 1 scan0283 | |
| Performance issues of a new carburettor, including poor fuel consumption and engine flooding. | 17th May 1935 | Box 102 \ 1 scan0284 | |
| Car that would not start, with petrol pouring from the overflow pipe, and a note of a similar complaint. | 17th May 1935 | Box 102 \ 1 scan0285 | |
| Test report on the performance of a Downdraught Stromberg Carburetter with a central heated small capacity manifold. | 27th May 1935 | Box 102 \ 1 scan0286 | |
| Test report on a Downdraught Stromberg Carburetter with a Central Water Heated Floor Manifold, detailing faults and modifications. | 27th May 1935 | Box 102 \ 1 scan0287 | |
| Modifying an American carburetor by reducing its choke diameter. | 27th May 1935 | Box 102 \ 1 scan0288 | |
| Request to supply a standard production 20/25 HP carburetter for fitting to an experimental car. | 27th May 1935 | Box 102 \ 1 scan0289 | |
| Investigation into 20/25 carburetter flooding, potentially caused by engine oscillation from rubber mountings. | 29th May 1935 | Box 102 \ 1 scan0290 | |
| On 20/25 HP carburetter flooding, proposing further tests related to a theory about rubber engine mountings. | 29th May 1935 | Box 102 \ 1 scan0291 | |
| Carburettor flooding on a 20/25 HP model and its potential link to flexible engine mounting. | 29th May 1935 | Box 102 \ 1 scan0292 | |
| Request for the manufacture of two sets of 25 HP carburetter parts to test variations in consumption at extreme drawing limits. | 31th May 1935 | Box 102 \ 1 scan0293 | |
| Introduction and testing of a new float chamber petrol filter for the 20/25 carburetter. | 31th May 1935 | Box 102 \ 1 scan0294 | |
| Arrangement of an experimental car for investigation of 25 HP carburettors. | 1st Jun 1936 | Box 102 \ 1 scan0295 | |
| On the 20/25 Four Port Induction System, discussing test results and proposing a new heat control design using a Buick part. | 3rd Jun 1935 | Box 102 \ 1 scan0296 | |
| Development and testing of induction pipes for a larger bore 20/25 engine. | 3rd Jun 1935 | Box 102 \ 1 scan0297 | |
| Test report and specifications for a Zenith Carburetter Type 48V1-2 fitted to an 18-G-IV. | 5th Jun 1935 | Box 102 \ 1 scan0298 | |
| Performance report on a Zenith 48V1-2 carburetter, detailing acceleration improvements and identified faults. | 7th Jun 1935 | Box 102 \ 1 scan0299 | |
| Letter to Zenith Carburetter Co. Ltd. detailing test results and remaining faults of the Carburetter Type 48V1-2. | 7th Jun 1935 | Box 102 \ 1 scan0300 | |
| Engine cut-out issues on a gradient and potential improvements with more economic settings. | 7th Jun 1935 | Box 102 \ 1 scan0301 | |
| Performance report on a Zenith Carburetter 48V1-2 fitted to an 18-G-IV engine. | 7th Jun 1935 | Box 102 \ 1 scan0302 | |
| Communication confirming car service details, including a carburetter comparison and adjustments to shocks and governor control. | 7th Jun 1935 | Box 102 \ 1 scan0303 | |
| Investigation into the cause of carburetter flooding on the 20/25 HP model. | 5th Jun 1935 | Box 102 \ 1 scan0304 | |
| Fitting a filter to a carburetter pipe and investigating flexible mountings. | 8th Jun 1935 | Box 102 \ 1 scan0305 | |
| Customer feedback on 20/25 HP petrol consumption and related flooding issues. | 8th Jun 1935 | Box 102 \ 1 scan0306 | |
| Customer complaint letter from Sir Banister Fletcher regarding the poor petrol consumption of his new car. | 31th May 1935 | Box 102 \ 1 scan0307 | |
| Float chamber petrol filter for the 20/25 Carburetter. | 31th May 1935 | Box 102 \ 1 scan0308 | |
| Extract from a letter by J.A. Fraser Henderson regarding poor petrol consumption. | 2nd Jun 1935 | Box 102 \ 1 scan0309 | |
| Customer complaints about petrol consumption in the 20/25 HP model and proposed actions. | 12th Jun 1935 | Box 102 \ 1 scan0310 | |
| Carburetter flooding on the 20/25 HP model and the need for a filter. | 12th Jun 1935 | Box 102 \ 1 scan0311 | |
| Tests to weaken the mixture of the 20/25 HP Carburetter. | 12th Jun 1935 | Box 102 \ 1 scan0312 | |
| Causes and solutions for carburetter flooding in a 20/25 HP model. | 12th Jun 1935 | Box 102 \ 1 scan0313 | |
| Internal correspondence concerning petrol consumption and carburettor issues for several customers. | 13th Jun 1935 | Box 102 \ 1 scan0314 | |
| Modification to the drilling of petrol holes for the 20/25 Horizontal Carburetter. | 13th Jun 1935 | Box 102 \ 1 scan0315 | |
| Blueprint for a modification involving inclined drillings in a float-chamber needle seating for a horizontal carburettor. | 13th Jun 1935 | Box 102 \ 1 scan0316 | |
| 20/25 model petrol consumption and the dispatch of a carburetter for testing on various customer cars. | 14th Jun 1935 | Box 102 \ 1 scan0317 | |
| Carburetter changes and petrol consumption for the 20/25 model for various customers. | 17th Jun 1935 | Box 102 \ 1 scan0318 | |
| Note regarding sending a filter for chassis GAE-19 and another set for a different car. | 17th Jun 1935 | Box 102 \ 1 scan0319 | |
| Carburetter flooding on the 20/25 HP model and suggesting a depot sheet for modifications. | 19th Jun 1935 | Box 102 \ 1 scan0320 | |
| Arranging for a car test on chassis GLG-3 for Sir Banister Fletcher. | 20th Jun 1935 | Box 102 \ 1 scan0321 | |
| Arranging for consumption tests and a new carburetter fitting on Sir Banister Fletcher's car. | 21th Jun 1935 | Box 102 \ 1 scan0322 | |
| Request for additional sets of photomicrographs concerning foreign matter from a flexible petrol pipe. | 26th Jun 1935 | Box 102 \ 1 scan0323 | |
| Confirming modifications for the 20/25 model to address carburetter flooding. | 26th Jun 1935 | Box 102 \ 1 scan0324 | |
| Modifications and settings for a Stromberg automatic choke and fast idle device. | 26th Jun 1935 | Box 102 \ 1 scan0325 | |
| Urgent request to expedite five flexible pipes with filters for 25 HP chassis due to carburetter flooding. | 27th Jun 1935 | Box 102 \ 1 scan0326 | |
| Sending five sets of photomicrographs related to foreign matter in a flexible petrol pipe. | 27th Jun 1935 | Box 102 \ 1 scan0327 | |
| The testing of 20/25 Carburetter Filters before fitting to customer cars. | 27th Jun 1935 | Box 102 \ 1 scan0328 | |
| Carburetter flooding on the 20/25 HP model, arranging modifications and part supply. | 27th Jun 1935 | Box 102 \ 1 scan0329 | |
| Laboratory memo about photomicrographs of foreign matter found in flexible petrol pipes. | 27th Jun 1935 | Box 102 \ 1 scan0330 | |
| Fitting and performance of carburettor filters on 20/25 HP customer cars. | 28th Jun 1935 | Box 102 \ 1 scan0331 | |
| Request for 8 sets of Photomicrographs Nos. A.1246/7 to be supplied to the Laboratory. | 28th Jun 1935 | Box 102 \ 1 scan0332 | |
| Urgent request for further photomicrographs related to foreign matter in flexible petrol pipes. | 28th Jun 1935 | Box 102 \ 1 scan0333 | |
| Petrol consumption and carburetter flooding issues for the 20/25 HP model. | 28th Jun 1935 | Box 102 \ 1 scan0334 | |
| Carburetter consumption issues, potential modifications, and mixture control systems. | 28th Jun 1935 | Box 102 \ 1 scan0335 | |
| Investigation into complaints of poor petrol consumption and flooding in 20/25 HP carburetters. | 25th Jun 1935 | Box 102 \ 1 scan0336 | |
| Table comparing petrol consumption figures for various cars and carburettor setups over different routes. | 25th Jun 1935 | Box 102 \ 1 scan0337 | |
| Comparison of performance and fuel consumption between a new and old type carburetter, including acceleration test data. | 25th Jun 1935 | Box 102 \ 1 scan0338 | |
| Investigation into carburetter flooding caused by foreign matter originating from the flexible pipe. | 25th Jun 1935 | Box 102 \ 1 scan0339 | |
| Micro-examination report on foreign matter found in a flexible petrol pipe. | 12th Jun 1935 | Box 102 \ 1 scan0340 | |
| Laboratory photomicrograph showing various particles at 10 diameters magnification. | 13th Apr 1934 | Box 102 \ 1 scan0341 | |
| Laboratory photomicrograph of a sample at 10 diameters magnification. | 13th Apr 1934 | Box 102 \ 1 scan0342 | |
| Laboratory photomicrograph report with magnification details. | 13th Apr 1934 | Box 102 \ 1 scan0343 | |
| Tests investigating foreign matter from flexible petrol piping causing flooding in 20/25 HP and Bentley carburettors. | 20th Jun 1935 | Box 102 \ 1 scan0344 | |
| Laboratory photomicrograph showing a sample of fibrous and particulate material at 10x magnification. | 13th Apr 1934 | Box 102 \ 1 scan0345 | |
| Photomicrograph showing a tangled mass of fine fibres or filaments magnified by 10 diameters. | 31th Jan 1932 | Box 102 \ 1 scan0346 | |
| Requesting additional pipe castings and preparation of carburettor controls for specific car chassis. | 28th Jun 1935 | Box 102 \ 1 scan0347 | |
| Brief summary of road tests on 6-port induction manifolds. | 29th Jun 1935 | Box 102 \ 1 scan0348 | |
| Foreign matter from a flexible petrol pipe, confirming the dispatch of three sets of photomicrographs. | 29th Jun 1935 | Box 102 \ 1 scan0349 | |
| Cover note for photomicrographs regarding foreign matter found in flexible petrol pipes. | 29th Jun 1935 | Box 102 \ 1 scan0350 | |
| Confirming the testing and approval of a new carburetter filter scheme for the 20/25 model after a small modification. | 1st Jul 1935 | Box 102 \ 1 scan0351 | |
| Tests on induction pipes for the placement of a 'Stromberg' automatic choke and instructions to alter an exhaust manifold. | 1st Jul 1935 | Box 102 \ 1 scan0352 | |
| Standardisation sheet for modifications to the 20/25 HP floatchamber filters. | 1st Jul 1935 | Box 102 \ 1 scan0353 | |
| Alteration to the 20/25 HP carburetter float chamber seating and a request for 6 replacements. | 1st Jul 1935 | Box 102 \ 1 scan0354 | |
| Standardisation sheet for 20/25 HP carburettor filters and modified seatings. | 2nd Jul 1935 | Box 102 \ 1 scan0355 | |
| Request to make and alter 25 HP carburetter parts for testing purposes. | 3rd Jul 1935 | Box 102 \ 1 scan0356 | |
| Test results and feedback concerning petrol consumption and flooding on a 20/25 HP carburettor. | 4th Jul 1935 | Box 102 \ 1 scan0357 | |
| Consumption tests for a 20/25 HP carburetter (19-G-IV) with parts machined to rich and weak limits. | 3rd Jul 1935 | Box 102 \ 1 scan0358 | |
| Decisions on manufacturing limits for the 20/25 carburetter. | 8th Jul 1935 | Box 102 \ 1 scan0359 | |
| List of agreed-upon modifications and improvements for a carburetter. | 9th Jul 1935 | Box 102 \ 1 scan0360 | |
| Modifications to the induction pipe and exhaust manifold for a 20/25 engine. | 9th Jul 1935 | Box 102 \ 1 scan0361 | |
| Potential trouble with the 4-port pipe system on the 20/25 model, requesting an investigation into sliding joints. | 9th Jul 1935 | Box 102 \ 1 scan0362 | |
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