| Description | Date | Identifier | |
| Experimental mock-up to fit two Bentley air silencers to a Spectre car to cure induction roar. | 23th Jan 1935 | Box 93 \ 2 scan0029 | |
| Performance of Spectre carburettors, noting better results with reversed throttle but serious flooding issues. | 13th Feb 1935 | Box 93 \ 2 scan0030 | |
| Technical memorandum on the development and improvement of Spectre carburetters. | 13th Feb 1938 | Box 93 \ 2 scan0031 | |
| Design flaws and operational difficulties with carburettors. | 13th Feb 1935 | Box 93 \ 2 scan0032 | |
| Modifications to Spectre Carburetters and requesting their application to all other sets. | 21th Feb 1935 | Box 93 \ 2 scan0033 | |
| Modifications and adjustments for 20/25 and Spectre carburetters. | 27th Feb 1935 | Box 93 \ 2 scan0034 | |
| The accessibility and compactness of the Spectre induction system and a proposal for a 2 carburetter alternative. | 8th Mar 1935 | Box 93 \ 2 scan0035 | |
| Test plan for the development and simplification of the Spectre engine's carburetion and induction system. | 11th Mar 1935 | Box 93 \ 2 scan0036 | |
| Need for a C.10 engine for tests and the overhaul schedule for a B.1 engine. | 11th Mar 1935 | Box 93 \ 2 scan0037 | |
| Request for the creation and modification of induction pipes for Spectre Carburation system tests. | 26th Mar 1935 | Box 93 \ 2 scan0038 | |
| Development and modification of induction pipes for comparative testing on the Spectre engine. | 16th Apr 1935 | Box 93 \ 2 scan0039 | |
| Secret memo clarifying an error regarding the status of a delayed carburetter design scheme for Spectre. | 17th Apr 1935 | Box 93 \ 2 scan0040 | |
| Summary and update on the development of induction systems for the Spectre car. | 25th Apr 1935 | Box 93 \ 2 scan0041 | |
| Outlining various configurations and modifications for induction systems. | 25th Apr 1935 | Box 93 \ 2 scan0042 | |
| Carburetter flooding issues and the evaluation of different petrol feed systems for Spectre and Bentley models. | 15th May 1935 | Box 93 \ 2 scan0043 | |
| Secret memorandum regarding the felt lining for the Spectre Air Silencer. | 7th Jun 1935 | Box 93 \ 2 scan0044 | |
| Modified throttle return spring mountings for Spectre carburettors. | 18th Jun 1935 | Box 93 \ 2 scan0045 | |
| Requesting the construction of two modified air silencers for car 2-S-1. | 27th Jun 1935 | Box 93 \ 2 scan0046 | |
| Possibility of testing a 2-carburetter system on the Spectre induction system. | 1st Jul 1935 | Box 93 \ 2 scan0047 | |
| Carburetion systems for the Spectre and 20/25 HP models. | 8th Jul 1935 | Box 93 \ 2 scan0048 | |
| Drawing of an induction pipe and exhaust manifold for the 20/25 model. | 6th Jul 1935 | Box 93 \ 2 scan0049 | |
| List of tests carried out on various induction system configurations for a six-cylinder engine. | 8th Jul 1935 | Box 93 \ 2 scan0050 | |
| Test results for a Bentley induction pipe with various carburetter and pipe end configurations. | 8th Jul 1935 | Box 93 \ 2 scan0051 | |
| Test report comparing the performance of a single horizontal carburetter against a single downdraught carburetter. | 8th Jul 1935 | Box 93 \ 2 scan0052 | |
| Test report comparing single downdraught and horizontal carburetters with different inlet pipe configurations. | 8th Jul 1935 | Box 93 \ 2 scan0053 | |
| Engine test results for downdraught carburettor performance and pipe configurations. | 8th Jul 1935 | Box 93 \ 2 scan0054 | |
| Test results for modifications to pipes and carburettors to improve gas flow and distribution. | 6th Jul 1935 | Box 93 \ 2 scan0055 | |
| Test report detailing modifications and observations of a large capacity centre chamber's effect on fuel mixture. | 8th Jul 1938 | Box 93 \ 2 scan0056 | |
| Fuel mixture fault related to unvaporised fuel suspension in the engine's centre chamber. | 8th Jul 1935 | Box 93 \ 2 scan0057 | |
| Test report comparing the performance of a 4-port pipe against a 6-port pipe, focusing on slow running and petrol distribution. | 8th Jul 1935 | Box 93 \ 2 scan0058 | |
| Carburettor and manifold tests, noting results on slow running, fuel distribution and 'building up' issues. | 8th Jul 1935 | Box 93 \ 2 scan0059 | |
| Test results for a 'Vee' formation pipe and single downdraught carburettor, detailing water and exhaust hot-spot performance. | 6th Jul 1935 | Box 93 \ 2 scan0060 | |
| Blueprint showing eight design variations for an engine induction system. | 6th Jul 1935 | Box 93 \ 2 scan0061 | |
| Blueprint detailing various designs for an induction system development. | 6th Jul 1935 | Box 93 \ 2 scan0062 | |
| Blueprint showing five different configurations for an exhaust manifold connection. | 1st Jul 1935 | Box 93 \ 2 scan0063 | |
| Power curve comparison graph for two different induction systems on a B4 Unit engine. | 1st Jul 1935 | Box 93 \ 2 scan0064 | |
| Power curve graph comparing single horizontal and downdraught carburettors on a B.4 Bentley unit. | 1st Jul 1935 | Box 93 \ 2 scan0065 | |
| Power curve comparison for a C.10 unit, testing single vs. twin downdraught carburettor induction systems. | 1st Jul 1935 | Box 93 \ 2 scan0066 | |
| The Spectre carburetter filter, referencing drawing LeC.4594 and modifications similar to the 20/25 engine. | 6th Jul 1935 | Box 93 \ 2 scan0067 | |
| Request to fit Spectres I & II with carburetter filters to LoC.4594. | 17th Jul 1935 | Box 93 \ 2 scan0068 | |
| Secret memo detailing a modification to the air intakes on Spectre carburettors. | 1st Aug 1935 | Box 93 \ 2 scan0069 | |
| Letter to The Southwark Manufacturing Co. Ltd. requesting the supply of eight Corru-Joint washers. | 12th Jul 1935 | Box 93 \ 2 scan0070 | |
| Secret memorandum detailing modifications to the Spectre Carburetter jet bush and housing. | 9th Aug 1935 | Box 93 \ 2 scan0071 | |
| Blueprint of a modified jet bush and housing nut for a Spectre carburettor. | 9th Aug 1935 | Box 93 \ 2 scan0072 | |
| Requesting the creation of a modified induction pipe based on sketch Hs.2080 for Spectre and 20/25 models. | 13th Aug 1935 | Box 93 \ 2 scan0073 | |
| Request to fit a 4-port induction system with two Stromberg carburettors to a No. 4 Spectre unit. | 26th Aug 1935 | Box 93 \ 2 scan0074 | |
| Requesting modifications for upcoming tests on the Spectre Induction System. | 30th Aug 1935 | Box 93 \ 2 scan0075 | |
| Plan to alter the Spectre Two Carburetter Induction System. | 3rd Sep 1935 | Box 93 \ 2 scan0076 | |
| Causes of ignition troubles and misfires in the Spectre engine. | 3rd Sep 1935 | Box 93 \ 2 scan0077 | |
| The development and issues with Spectre Carburetters, specifically regarding reverse throttle and bore size. | 6th Sep 1935 | Box 93 \ 2 scan0078 | |
| Testing and modification of Spectre Carburetters. | 6th Sep 1935 | Box 93 \ 2 scan0079 | |
| Carburettor testing results and recommended modifications for increased performance. | 6th Sep 1935 | Box 93 \ 2 scan0080 | |
| Fitting a carburetter filter with existing carburetters for the SPECTRE model, referencing a print LeC 4693. | 10th Sep 1935 | Box 93 \ 2 scan0081 | |
| Flooding issue on the No.2 Spectre chassis, requesting new carburetter floats for trials. | 13th Sep 1935 | Box 93 \ 2 scan0082 | |
| Secret and urgent memo detailing a modification to Spectre engine carburetters to allow for easier maintenance. | 13th Sep 1935 | Box 93 \ 2 scan0083 | |
| Drawing of a modified petrol pipe attachment for a reversed throttle carburettor on a Spectre model. | 13th Sep 1930 | Box 93 \ 2 scan0084 | |
| Fitting external float chamber vent pipes to Spectre carburettors for car 2 S I. | 18th Sep 1935 | Box 93 \ 2 scan0085 | |
| Fitting of Stromberg downdraught carburetters to Phantom III engines. | 23th Sep 1935 | Box 93 \ 2 scan0086 | |
| Requesting the modification of carburettor jets for a unit on the test bed. | 23th Sep 1935 | Box 93 \ 2 scan0087 | |
| New drawings and part numbers for the Spectre Chassis carburetter, air silencer, and oil fittings. | 25th Sep 1935 | Box 93 \ 2 scan0088 | |
| Parts changes for the Spectre Chassis carburetter, air silencer, and oil fittings. | 26th Sep 1935 | Box 93 \ 2 scan0089 | |
| List of new tracings for a silencer and petrol feed pipe assembly, completing experiment instructions. | 26th Sep 1935 | Box 93 \ 2 scan0090 | |
| Requesting tests on the Spectre engine's induction systems, specifically regarding carburetter and throttle orientation. | 27th Sep 1935 | Box 93 \ 2 scan0091 | |
| Fitting of experimental two-carburetter down-draught induction pipes to a Phantom III engine. | 28th Sep 1935 | Box 93 \ 2 scan0092 | |
| Modifications to the Spectre Chassis carburetter float-chamber vent. | 30th Sep 1935 | Box 93 \ 2 scan0093 | |
| Instruction to increase the diameter of the Spectre air silencer from 6.00' to 7.00' for production. | 1st Oct 1935 | Box 93 \ 2 scan0094 | |
| Blueprint for the Phantom III two carburetter down draught induction system. | 2nd Oct 1935 | Box 93 \ 2 scan0095 | |
| Issues with the Phantom III carburettors, including accelerator pedal spring tension and float mechanism design. | 3rd Oct 1935 | Box 93 \ 2 scan0096 | |
| Modifications to a float and needle mechanism. | 3rd Oct 1935 | Box 93 \ 2 scan0097 | |
| Payment for an invoice from The Southwark Manufacturing Co. Ltd. for 8 Nickel Alloy Corrujoints. | 3rd Oct 1935 | Box 93 \ 2 scan0098 | |
| Points raised about the Phantom III four carburetter induction system. | 3rd Oct 1935 | Box 93 \ 2 scan0099 | |
| Report page detailing tests on throttle springs and modifications to an air intake resonance chamber to prevent backfire. | 4th Oct 1935 | Box 93 \ 2 scan0100 | |
| Modification to the induction pipe for the Phantom III experimental down-draught system. | 4th Oct 1935 | Box 93 \ 2 scan0101 | |
| Modifications to the Phantom III reverse throttle carburetter's lightened throttle spring. | 4th Oct 1935 | Box 93 \ 2 scan0102 | |
| To place an order for 8 Nickel Alloy Corrujoints from The Southwark Manfg. Co. | 5th Oct 1935 | Box 93 \ 2 scan0103 | |
| Investigation into heavy mixture control operation on Phantom III carburetters. | 8th Oct 1935 | Box 93 \ 2 scan0104 | |
| Float mechanism, petrol levels, and flooding issues in Phantom III carburettors. | 8th Oct 1935 | Box 93 \ 2 scan0105 | |
| Carburettor tests concerning petrol flow, needle valve, and return spring mechanisms. | 8th Oct 1935 | Box 93 \ 2 scan0106 | |
| Confirming the dispatch of blueprint LeC.4739 for an experimental down-draught induction system for Phantom III cylinder heads. | 9th Oct 1935 | Box 93 \ 2 scan0107 | |
| Letter from The Southwark Manufacturing Co. Ltd. requesting clarification on a drawing for 'Corrujoints'. | 10th Sep 1935 | Box 93 \ 2 scan0108 | |
| Specification sheet detailing 16 modifications for the carburetters on the first twelve Phantom III production chassis. | 11th Oct 1935 | Box 93 \ 2 scan0109 | |
| List of specifications concerning gauze fitting for an air silencer and materials for a mixture control mechanism. | 11th Oct 1935 | Box 93 \ 2 scan0110 | |
| Potential fire hazard from carburettor back-fires on the Phantom III and the need for a flame trap. | 11th Oct 1935 | Box 93 \ 2 scan0111 | |
| Letter to The Southwark Manufacturing Co. Ltd. concerning an amendment to a blueprint. | 12th Sep 1935 | Box 93 \ 2 scan0112 | |
| Flooding test on a Phantom III Stromberg carburetter to assess petrol leakage. | 26th Oct 1935 | Box 93 \ 2 scan0113 | |
| The use of a single type Stromberg downdraught carburettor on large bore 20's models. | 26th Oct 1935 | Box 93 \ 2 scan0114 | |
| The Duplex Down Draught Carburetter Induction System for the Phantom III, sending drawings and describing the system. | 28th Oct 1935 | Box 93 \ 2 scan0115 | |
| Comparison table of choke sizes and depressions for a Size 3 carburetter. | 29th Oct 1935 | Box 93 \ 2 scan0116 | |
| Request to manufacture and trial flame traps for the Phantom III standard carburettors. | 30th Oct 1935 | Box 93 \ 2 scan0117 | |
| Flooding tests and leaks on a Phantom III Duplex Stromberg carburetter. | 31th Oct 1935 | Box 93 \ 2 scan0118 | |
| Request to modify carburetter suction pistons for a Phantom III for cold starting experiments. | 14th Nov 1935 | Box 93 \ 2 scan0119 | |
| Test results for a heated riser on a Ph.III (Duplex Stromberg Carburetter), noting improved distribution. | 10th Dec 1935 | Box 93 \ 2 scan0120 | |
| Requesting the creation of a brass pipe set for the Ph.III Stromberg Duplex Carburetter induction system. | 13th Dec 1935 | Box 93 \ 2 scan0121 | |
| Design changes for the water return pipe on a Phantom III Duplex Downdraught Carburetter. | 14th Dec 1935 | Box 93 \ 2 scan0122 | |
| Experimental air intake silencer for the Phantom III chassis. | 20th Dec 1935 | Box 93 \ 2 scan0123 | |
| Marked-up print for an experimental air intake silencer for the Phantom III chassis. | 20th Dec 1935 | Box 93 \ 2 scan0124 | |
| Modifications to the Phantom III induction systems and Stromberg carburettors. | 30th Dec 1935 | Box 93 \ 2 scan0125 | |
| Modifications to the Phantom III induction system's drainage wells. | 21th Feb 1936 | Box 93 \ 2 scan0126 | |
| Comparison of an experimental mock-up duplex down draught carburettor against another design for the Phantom III. | 7th Jan 1936 | Box 93 \ 2 scan0127 | |
| Carburettor modifications and their effect on fuel distribution and engine performance. | 7th Jan 1936 | Box 93 \ 2 scan0128 | |
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