| Description | Date | Identifier | |
| Graph plotting power output and horsepower loss against R.P.M for an E.A.C. engine exhaust system after alterations. | 7th Feb 1925 | Box 66 \ 2 scan0024 | |
| Graph of engine power output experiments with various exhaust system configurations. | 6th Feb 1925 | Box 66 \ 2 scan0025 | |
| Graph of horse power loss against R.P.M. for different components of an E.A.C. engine exhaust system. | 6th Feb 1925 | Box 66 \ 2 scan0026 | |
| Instruction to implement a new scheme for a spring loaded exhaust choke valve, cancelling previous fittings. | 26th Feb 1925 | Box 66 \ 2 scan0027 | |
| Confirming a verbal conversation to alter the exhaust system by removing bends as the starter motor is no longer required. | 27th Feb 1925 | Box 66 \ 2 scan0028 | |
| Indicator diagrams for engine tests with double exhaust pipes and a manifold for each 3 cylinders. | 27th Feb 1925 | Box 66 \ 2 scan0029 | |
| Indicator diagrams showing engine performance with single straight pipes at various RPMs. | 27th Feb 1925 | Box 66 \ 2 scan0030 | |
| Sheet of four indicator diagrams for an engine with a standard exhaust manifold at various RPMs. | 27th Feb 1925 | Box 66 \ 2 scan0031 | |
| Five graphs comparing engine manifold performance at 2000 RPM. | 27th Feb 1925 | Box 66 \ 2 scan0032 | |
| Graph of piston displacement for crank angles for a 40-50 engine with a standard exhaust system and closed cut out. | 4th Apr 1924 | Box 66 \ 2 scan0033 | |
| Graph showing the results of an exhaust system test on cylinder 6 of a 40-50 engine at 2000 RPM. | 4th Apr 1924 | Box 66 \ 2 scan0034 | |
| Indicator diagram showing pressure vs crank angle for a 40-50 engine's exhaust stroke. | 4th Apr 1924 | Box 66 \ 2 scan0035 | |
| Graph of piston displacement for crank angles, relating to a 40-50 engine's exhaust scheme. | 4th Apr 1924 | Box 66 \ 2 scan0036 | |
| Graph showing the Derby exhaust scheme for a 40-50 engine, cylinder no. 6 at 2000 RPM. | 4th Apr 1924 | Box 66 \ 2 scan0037 | |
| Graph of pressure versus crank angle for a 40-50 engine's Derby exhaust scheme. | 28th Apr 1925 | Box 66 \ 2 scan0038 | |
| Secret memo requesting a scheme to convert 40/50 cars to water-heated throttles, cancelling the exhaust butterfly valve. | 28th Apr 1925 | Box 66 \ 2 scan0039 | |
| On overheating issues in 40/50s models, discussing the choice between exhaust heated and water heated throttles. | 28th Apr 1925 | Box 66 \ 2 scan0040 | |
| Suggestion to wire Australia with instructions to modify and retest a throttle system. | 29th Apr 1925 | Box 66 \ 2 scan0041 | |
| Recommendations for engine cooling modifications to prevent water boiling, particularly for hot climates. | 29th Apr 1925 | Box 66 \ 2 scan0042 | |
| Studies for chassis improvements based on points raised by Mr. Johnson. | 15th Apr 1925 | Box 66 \ 2 scan0043 | |
| Test on exhaust pipe expansion, requesting alterations due to reported failures. | 30th Apr 1925 | Box 66 \ 2 scan0044 | |
| The expansion of F.H.C.I. exhaust manifolds. | 23th Jul 1935 | Box 66 \ 2 scan0045 | |
| Tests of heat flow to cooling water with varying exhaust back pressure on an 'Eagle' engine. | 29th Apr 1925 | Box 66 \ 2 scan0046 | |
| Analyzing heat flow and power curves under different throttle and back pressure conditions. | 29th Apr 1925 | Box 66 \ 2 scan0047 | |
| Engine heat flow, back pressure, and power output. | 29th Apr 1925 | Box 66 \ 2 scan0048 | |
| Exhaust down-pipe baffle and its effects on over-heating. | 30th Apr 1925 | Box 66 \ 2 scan0049 | |
| The effects of a closed exhaust baffle on engine performance and cooling system temperature. | 30th Apr 1925 | Box 66 \ 2 scan0050 | |
| Tests of an exhaust baffle and butterfly related to engine overheating. | 30th Apr 1925 | Box 66 \ 2 scan0051 | |
| Graph plotting heat flow to cooling water against brake horse power for an E.A.C. engine. | 28th Apr 1925 | Box 66 \ 2 scan0052 | |
| Graph plotting heat flow to cooling water against increasing exhaust back pressure for an E.A.C. engine at 1500 RPM and 50 B.HP | 27th Apr 1925 | Box 66 \ 2 scan0053 | |
| Summary on over-heating investigations. | 5th May 1925 | Box 66 \ 2 scan0054 | |
| Secret memorandum about reverting to water heating for the throttle on the EAC and 40/50 models. | 1st May 1925 | Box 66 \ 2 scan0055 | |
| Secret memo suggesting making exhaust downtake pipes from Everbright or Stainless steel to avoid brazing or welding. | 4th May 1925 | Box 66 \ 2 scan0056 | |
| Exhaust fumes entering the car body and a proposed fix involving a swan neck exhaust pipe. | 1st Jun 1925 | Box 66 \ 2 scan0057 | |
| Customer and press criticism regarding the exhaust noise of the 'New Phantom' and requesting solutions. | 22th Jul 1925 | Box 66 \ 2 scan0058 | |
| From Hs. to BJ. regarding complaints about exhaust noise in the New Phantom and ongoing tests with modified silencers. | 23th Jul 1925 | Box 66 \ 2 scan0059 | |
| Proposal to experiment with stainless steel tubes for exhaust systems to combat corrosion. | 24th Jul 1925 | Box 66 \ 2 scan0060 | |
| Requesting an update on improving the exhaust noise of the New Phantom. | 20th Aug 1925 | Box 66 \ 2 scan0061 | |
| Request to schedule the testing of a New Phantom's improved, noise-reducing exhaust system in London. | 10th Aug 1925 | Box 66 \ 2 scan0062 | |
| Customer criticism and the negative impact of the 'New Phantom' exhaust noise on the company's reputation. | 19th Aug 1925 | Box 66 \ 2 scan0063 | |
| Improving the exhaust system for the New Phantom and resolving a whistling noise. | 21th Aug 1925 | Box 66 \ 2 scan0064 | |
| Plan to test a modification for exhaust noise on 'New Phantom' trial cars. | 21th Aug 1925 | Box 66 \ 2 scan0065 | |
| The fitting of a new exhaust system to a New Phantom Open Touring Car. | 25th Aug 1925 | Box 66 \ 2 scan0066 | |
| Telegram about sending an open touring Phantom for a new exhaust system. | 25th Aug 1925 | Box 66 \ 2 scan0067 | |
| Telegram received by telephone regarding the dispatch of an open touring phantom for a new exhaust system. | 25th Aug 1925 | Box 66 \ 2 scan0068 | |
| Loss of power and speed on a 'Phantom' demonstration car after fitting a new silencer. | 1st Sep 1925 | Box 66 \ 2 scan0069 | |
| Change from exhaust heating to water heating for the EAC carburetter on the New Phantom. | 1st Sep 1925 | Box 66 \ 2 scan0070 | |
| Power loss due to a silencer on vehicle 103-MC and recommending further testing. | 1st Sep 1925 | Box 66 \ 2 scan0071 | |
| Noise levels and performance issues of car 103-MC compared to other models like the 'Phantom' and 'Silver Ghost'. | 2nd Sep 1925 | Box 66 \ 2 scan0072 | |
| Noise levels and potential adoption of a modified exhaust silencer on car 103-MC. | 9th Sep 1925 | Box 66 \ 2 scan0073 | |
| Modification to the exhaust heating system on the New Phantom model. | 4th Sep 1925 | Box 66 \ 2 scan0074 | |
| Requesting a comparison of a new exhaust system following tests. | 7th Sep 1925 | Box 66 \ 2 scan0075 | |
| Chasing a cure for exhaust noise and spitting in the silencer on the 'New Phantom' chassis. | 10th Sep 1925 | Box 66 \ 2 scan0076 | |
| The performance of an exhaust system fitted to car 103-MC. | 11th Sep 1935 | Box 66 \ 2 scan0077 | |
| Road performance tests of a concentric tube silencer. | 11th Sep 1925 | Box 66 \ 2 scan0078 | |
| Comparison of exhaust noise and silencer performance between different vehicle models. | 11th Sep 1925 | Box 66 \ 2 scan0079 | |
| The exhaust noise of car 103-MC, comparing silencer options and performance against Phantom and Silver Ghost models. | 12th Sep 1925 | Box 66 \ 2 scan0080 | |
| Effectiveness of a new silencer compared to the 'Silver Ghost' model and querying horsepower curve data. | 14th Sep 1925 | Box 66 \ 2 scan0081 | |
| Exhaust noise and silencer performance figures for car 103-MC. | 14th Sep 1925 | Box 66 \ 2 scan0082 | |
| Suggesting the inclusion of exhaust analysis in the testing of car and aero engines. | 9th Sep 1925 | Box 66 \ 2 scan0083 | |
| Modifications to the exhaust silencer system for American 'Phantom' chassis cars. | 16th Sep 1925 | Box 66 \ 2 scan0084 | |
| Reducing exhaust noise in the Phantom model car by testing two different silencer designs. | 1st Sep 1925 | Box 66 \ 2 scan0085 | |
| Alternative silencer designs for the New Phantom model. | 16th Sep 1925 | Box 66 \ 2 scan0086 | |
| The performance and design of various vehicle silencers. | 16th Sep 1925 | Box 66 \ 2 scan0087 | |
| Performance and power loss of different vehicle silencers. | 5th Sep 1925 | Box 66 \ 2 scan0088 | |
| Dynamometer graph comparing engine power curves with various silencer configurations. | 5th Sep 1925 | Box 66 \ 2 scan0089 | |
| Comparing a 'Phantom' small diameter aluminium induction pipe and water-heated hot spot against the standard system. | 18th Sep 1925 | Box 66 \ 2 scan0090 | |
| Confirming drawings for the 'Phantom' exhaust system have been sent to Springfield. | 18th Sep 1925 | Box 66 \ 2 scan0091 | |
| New silencer design for the exhaust system which, while quiet, causes considerable loss of power. | 24th Sep 1925 | Box 66 \ 2 scan0092 | |
| Significant power loss caused by the Phantom concentric tube silencer. | 22th Sep 1925 | Box 66 \ 2 scan0093 | |
| Performance and design of the Phantom exhaust system silencer. | 25th Sep 1925 | Box 66 \ 2 scan0094 | |
| Testing and urgent implementation of a new, quieter silencer for the 'New Phantom' exhaust system. | 28th Sep 1925 | Box 66 \ 2 scan0095 | |
| Power loss associated with the Phantom Exhaust Concentric Tube Silencer. | 22th Sep 1925 | Box 66 \ 2 scan0096 | |
| Cancelling a previous document to be replaced with an attached re-written version regarding the 'New Phantom' exhaust system. | 29th Sep 1925 | Box 66 \ 2 scan0097 | |
| Testing and urgent standardisation of a new silencer for the 'New Phantom' exhaust system. | 29th Sep 1925 | Box 66 \ 2 scan0098 | |
| Design modifications for the Phantom Silencer. | 10th May 1925 | Box 66 \ 2 scan0099 | |
| Testing and production of a new silencer for the 'New Phantom' exhaust system. | 5th Oct 1925 | Box 66 \ 2 scan0100 | |
| Challenges of making the Phantom's exhaust system as quiet as the Silver Ghost's. | 2nd Oct 1925 | Box 66 \ 2 scan0101 | |
| Correcting a typing error in a previous communication regarding the 'New Phantom' exhaust. | 5th Oct 1925 | Box 66 \ 2 scan0102 | |
| Urgent introduction of a new, quieter exhaust system for the 'New Phantom' to replace the noisy standard version. | 9th Oct 1925 | Box 66 \ 2 scan0103 | |
| Development of a new exhaust system and modified silencer for the Phantom model. | 10th Oct 1925 | Box 66 \ 2 scan0104 | |
| Investigating an objectionable exhaust noise on the New Phantom chassis and the proposed modification to fix it. | 12th Jun 1925 | Box 66 \ 2 scan0105 | |
| The effects of shortening an exhaust pipe, including comparative performance data. | 12th Jun 1925 | Box 66 \ 2 scan0106 | |
| Modifications and material suggestions for the Phantom silencer, including a proposal from Mr. Royce. | 12th Oct 1925 | Box 66 \ 2 scan0107 | |
| Improving the Phantom exhaust system, suggesting a smaller aluminium silencer to be tried. | 13th Oct 1925 | Box 66 \ 2 scan0108 | |
| The urgent fitting of a new silencer to a 'New Phantom' vehicle. | 16th Oct 1925 | Box 66 \ 2 scan0109 | |
| The new silencer for the 'New Phantom', its fitting to company cars, and policy regarding existing customers. | 14th Oct 1925 | Box 66 \ 2 scan0110 | |
| Noisy exhaust of the New Phantom and the urgent need for a new silencer to prevent losing orders. | 23th Oct 1925 | Box 66 \ 2 scan0111 | |
| Design, testing, and implementation of a new silencer for the New Phantom model. | 27th Oct 1925 | Box 66 \ 2 scan0112 | |
| Cost-effectiveness of dismantling and rebuilding silencers versus building new ones. | 27th Oct 1925 | Box 66 \ 2 scan0113 | |
| Conference discussing the replacement of the standard silencer with a new, easier-to-make design for the 'New Phantom'. | 5th Nov 1925 | Box 66 \ 2 scan0114 | |
| Testing a new silencer for the New Phantom model and forwarding a list of cars requiring it. | 11th Nov 1925 | Box 66 \ 2 scan0115 | |
| Confirmation of an agreement to cut down an intermediate exhaust pipe and a query to the Experimental department about retaining a nozzle. | 11th Nov 1925 | Box 66 \ 2 scan0116 | |
| Seeking permission to instruct the Works to manufacture parts for 'New Phantom' silencers. | 13th Nov 1925 | Box 66 \ 2 scan0117 | |
| The alteration of the carburetter and induction pipe heating. | 18th Nov 1925 | Box 66 \ 2 scan0118 | |
| Difficulties with carburetter and induction pipe heating and proposing a hybrid solution. | 13th Nov 1925 | Box 66 \ 2 scan0119 | |
| The operation of the carburetter system, focusing on exhaust and water heating during startup. | 23th Nov 1925 | Box 66 \ 2 scan0120 | |
| The performance of a modified silencer for the Phantom model. | 23th Nov 1925 | Box 66 \ 2 scan0121 | |
| Petrol consumption and proposing experiments to improve efficiency by heating the throttle or carburetter air intake. | 25th Nov 1925 | Box 66 \ 2 scan0122 | |
| Comparative silencer tests for the New Phantom model. | 27th Nov 1925 | Box 66 \ 2 scan0123 | |
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