| Description | Date | Identifier | |
| Letter to Messrs. Chillcotts Ltd. requesting information on their silencing system principles and methods of construction. | 27th Nov 1931 | Box 152 \ 3 scan0060 | |
| Letter from Chillcotts Limited proposing a meeting with their technical engineer to discuss 'Cylo' Silencers. | 28th Nov 1931 | Box 152 \ 3 scan0061 | |
| Advertisement page for the patented 'Cylo' Silencer manufactured by Chillcotts, Limited. | 30th Nov 1931 | Box 152 \ 3 scan0062 | |
| Letter to Messrs. Chillcotts Ltd. arranging a visit for Mr. Kirkland. | 30th Nov 1931 | Box 152 \ 3 scan0063 | |
| Letter from Chillcotts Limited arranging a visit to discuss 'Cylo' Silencers. | 3rd Dec 1931 | Box 152 \ 3 scan0064 | |
| Letter from Chillcotts Limited concerning the performance of 'Cylo' Silencers and a proposal for a new model. | 9th Dec 1931 | Box 152 \ 3 scan0065 | |
| Advertisement brochure for the 'Cylo' patented silencer by Chillcotts, Limited. | 16th Dec 1931 | Box 152 \ 3 scan0066 | |
| Letter to Chillcotts Ltd. requesting the creation of an experimental silencer for a Phantom II model car. | 16th Dec 1931 | Box 152 \ 3 scan0067 | |
| Letter from Chillcotts Limited acknowledging receipt of a letter and blueprint regarding 'Cylo' Silencers. | 17th Dec 1931 | Box 152 \ 3 scan0068 | |
| Letter from Chillcotts Limited requesting engine specifications to manufacture an experimental silencer for a Phantom II model. | 21th Dec 1931 | Box 152 \ 3 scan0069 | |
| Letter providing Phantom II engine specifications to silencer manufacturer, Chillcotts Ltd. | 22th Dec 1931 | Box 152 \ 3 scan0070 | |
| Letter from Chillcotts Limited acknowledging receipt of a letter regarding 'Cylo' Silencers. | 24th Dec 1931 | Box 152 \ 3 scan0071 | |
| Letter from Chillcotts Ltd. regarding the design of 'Cylo' silencers based on a blueprint. | 31th Dec 1931 | Box 152 \ 3 scan0072 | |
| Letter to Chillcotts Limited regarding the design of a silencer cut-out and enclosing blueprint E.79108. | 1st Jan 1931 | Box 152 \ 3 scan0073 | |
| Letter from Chillcotts Limited regarding the design and submission of a suitable 'Cylo' Silencer. | 2nd Jan 1932 | Box 152 \ 3 scan0074 | |
| Letter to Chillcotts Ltd. regarding progress on a Cylo silencer for the 40/50 model car. | 15th Feb 1932 | Box 152 \ 3 scan0075 | |
| Letter from Chillcotts Ltd regarding a delay in supplying a sample 'Cylo' Silencer for testing due to an issue with the cut-out part. | 16th Feb 1932 | Box 152 \ 3 scan0076 | |
| Letter to Chillcotts Ltd. regarding the production of a sample Cylo silencer for a 40/50 car. | 15th Mar 1932 | Box 152 \ 3 scan0077 | |
| Letter from Chillcotts Limited apologising for a delay in sending a sample silencer due to manufacturing issues. | 16th Mar 1932 | Box 152 \ 3 scan0078 | |
| Letter from Chillcotts Limited regarding a delay and an unsuitable cut-out for a sample Silencer. | 4th May 1932 | Box 152 \ 3 scan0079 | |
| Letter from Chillcotts Limited following up on a sample 'Cylo' Silencer sent for testing. | 30th May 1932 | Box 152 \ 3 scan0080 | |
| Material analysis of a Cadillac exhaust expansion chamber. | 17th Jun 1932 | Box 152 \ 3 scan0081 | |
| Letter to Chillcotts Limited regarding a delay in testing a 'Cylo' sample silencer. | 2nd Jun 1932 | Box 152 \ 3 scan0082 | |
| Analysis and preliminary back pressure tests on a Cadillac silencer for the 20/25 HP car. | 2nd Jun 1932 | Box 152 \ 3 scan0083 | |
| Graph showing results of exhaust silencer tests on a Phantom II unit. | 2nd Jun 1932 | Box 152 \ 3 scan0084 | |
| Letter from Chillcotts Limited regarding a delay in sending a sample 'Cylo' Silencer for testing. | 3rd Jun 1932 | Box 152 \ 3 scan0085 | |
| Letter to Mr. Ellis at the National Physical Laboratory to arrange a meeting to discuss silencer development. | 17th Oct 1932 | Box 152 \ 3 scan0086 | |
| Requesting air silencers and information on the Alfa Romeo blower. | 24th Oct 1932 | Box 152 \ 3 scan0087 | |
| Sales letter from Burgess Products Company promoting their straight-through silencers for automobiles. | 27th Oct 1932 | Box 152 \ 3 scan0088 | |
| Advertising leaflet for the Burgess Straight-through Silencer, detailing its design, benefits, and pricing. | 28th Oct 1932 | Box 152 \ 3 scan0089 | |
| Advertisement for the Burgess Straight-through Silencer, explaining its function in eliminating back pressure and its benefits. | 28th Oct 1932 | Box 152 \ 3 scan0090 | |
| Promotional brochure for Burgess Silencers for air compressors, blowers, and internal combustion engines. | 28th Oct 1932 | Box 152 \ 3 scan0091 | |
| Product data sheet and price list for Burgess Silencers, detailing their 'straight-through' design and application for air compressor intakes. | 2nd Nov 1932 | Box 152 \ 3 scan0092 | |
| Letter to The Burgess Products Co. enquiring about suitable air intake silencers for a six-cylinder engine. | 2nd Nov 1932 | Box 152 \ 3 scan0093 | |
| Letter from Burgess Products Company regarding a potential visit to their new factory to discuss a straight-through silencer. | 4th Nov 1932 | Box 152 \ 3 scan0094 | |
| Letter from Burgess Products Company regarding the dispatch of hand-made intake silencers for testing. | 24th Nov 1932 | Box 152 \ 3 scan0095 | |
| General report on the development and testing of carburetter intake silencers. | 28th Nov 1932 | Box 152 \ 3 scan0096 | |
| The design of an A.C. Silencer for a 5-litre engine, including a diagram and discussion of tuning methods. | 28th Nov 1932 | Box 152 \ 3 scan0097 | |
| Tests and design alternatives for a semi-expanding carburetter air intake silencer. | 28th Nov 1932 | Box 152 \ 3 scan0098 | |
| Intake silencer tests, comparing various designs for silencing efficiency, power loss, and weight. | 28th Nov 1932 | Box 152 \ 3 scan0099 | |
| Recommendation for an intermediate-sized induction pipe silencer with an accompanying photograph. | 28th Nov 1932 | Box 152 \ 3 scan0100 | |
| Blueprint of Phantom II resonance silencers for a semi-expanding carburetter, showing two design variations with their dimensions and performance data. | 28th Nov 1932 | Box 152 \ 3 scan0101 | |
| Blueprint comparing two designs for Phantom II intake resonance silencers for a semi-expanding carburetter. | 28th Nov 1932 | Box 152 \ 3 scan0102 | |
| Blueprint detailing two types of American intake silencers for Chrysler and Nash vehicles. | 28th Nov 1932 | Box 152 \ 3 scan0103 | |
| Blueprint of a typical A.C. silencer for a 5-litre car. | 16th Dec 1932 | Box 152 \ 3 scan0104 | |
| Letter from Chillcotts Limited regarding the supply of 'Cylo' Silencers. | 16th Dec 1932 | Box 152 \ 3 scan0105 | |
| Photograph of a vertical silencer for a semi-expanding carburetter. | 19th Dec 1932 | Box 152 \ 3 scan0106 | |
| Photograph of the left-hand side of an inline-6 engine installation. | 27th Jan 1933 | Box 152 \ 3 scan0107 | |
| Sending drawings for modifications to the Phantom II Resonance Air Silencer and air intake. | 27th Jan 1933 | Box 152 \ 3 scan0108 | |
| Letter from G. Blanchard to N. Hives regarding an improved patented Silencer for motors. | 31th Jan 1933 | Box 152 \ 3 scan0109 | |
| Page two of a letter to N. Hives Esq. concerning an improved silencer design, offering manufacturing rights, and mentioning a patented exhaust manifold. | 31th Jan 1933 | Box 152 \ 3 scan0110 | |
| Promotional pamphlet for the 'Supervac Vacuum Silencer' highlighting its benefits and customer testimonials. | 31th Jan 1933 | Box 152 \ 3 scan0111 | |
| Price list for 'Supervac' vacuum silencers and 'Lanchway' silencers for various cars and trucks. | 1st Feb 1933 | Box 152 \ 3 scan0112 | |
| Letter from the National Physical Laboratory inquiring about the progress of a silencer design. | 1st Feb 1933 | Box 152 \ 3 scan0113 | |
| Letter to Mr. Ellis of the National Physical Laboratory regarding a delay in testing his silencer. | 4th Feb 1933 | Box 152 \ 3 scan0114 | |
| Letter acknowledging correspondence about a patented silencer and returning the associated drawing. | 6th Feb 1933 | Box 152 \ 3 scan0115 | |
| Letter to J.W. Roberts Ltd regarding spraying a car silencer with asbestos. | 24th Feb 1933 | Box 152 \ 3 scan0116 | |
| Follow-up letter from Burgess Products Company regarding the testing of sample carburettor intake silencers. | 24th Apr 1933 | Box 152 \ 3 scan0117 | |
| Letter to Burgess Products Co. regarding the development of an in-house air intake silencer. | 8th May 1933 | Box 152 \ 3 scan0118 | |
| Letter from Burgess Products Company acknowledging a previous letter regarding a straight-through silencer. | 9th May 1933 | Box 152 \ 3 scan0119 | |
| The Vokes-Blanvac exhaust silencer, including an extract from the manufacturer. | 19th Jun 1933 | Box 152 \ 3 scan0120 | |
| Test report on the Vokes-Blanvac exhaust silencer. | 31th May 1933 | Box 152 \ 3 scan0121 | |
| Comparative test report on the Vokes-Blanvac exhaust silencer against a competitive model at various engine speeds. | 4th May 1938 | Box 152 \ 3 scan0122 | |
| Report comparing Vokes-Blanvac exhaust silencers against competitor and manufacturer models, detailing back pressures at various RPMs. | 4th May 1938 | Box 152 \ 3 scan0123 | |
| Vokes-Blanvac exhaust silencers for commercial vehicle engines. | 2nd Jun 1933 | Box 152 \ 3 scan0124 | |
| Requesting more information on the efficiency of a Vokes silencer before testing. | 22th Jun 1933 | Box 152 \ 3 scan0125 | |
| Cover memo for a letter addressed to C. G. Vokes, Limited regarding a silencer. | 30th Jun 1933 | Box 152 \ 3 scan0126 | |
| Letter to Messrs. C. G. Vokes, Ltd. regarding a visit and future correspondence arrangements. | 30th Jun 1933 | Box 152 \ 3 scan0127 | |
| Letter to C.G. Vokes Ltd. regarding improvements to an air cleaner. | 3rd Jul 1933 | Box 152 \ 3 scan0128 | |
| Blueprint for a Phantom II Air Silencer. | 1st Jul 1938 | Box 152 \ 3 scan0129 | |
| Letter to C.G. Vokes Ltd. concerning blueprints and requirements for silencer and exhaust systems for Phantom II and Bentley cars. | 21th Jul 1933 | Box 152 \ 3 scan0130 | |
| Letter detailing specifications for an intake silencer and engine, requesting confidentiality for the enclosed blueprints. | 25th Jul 1933 | Box 152 \ 3 scan0131 | |
| Letter from C.G. Vokes Limited acknowledging receipt of drawings for various vehicle silencers. | 25th Jul 1933 | Box 152 \ 3 scan0132 | |
| Letter from C.G. Vokes Limited requesting details on exhaust components for Bentley and Phantom II cars. | 28th Jul 1933 | Box 152 \ 3 scan0133 | |
| Request to supply various silencer parts to be forwarded to C.G. Vokes Ltd. | 4th Aug 1933 | Box 152 \ 3 scan0134 | |
| Letter to C.G. Vokes Ltd. confirming the supply of a silencer and outlet flange for a Phantom II exhaust. | 4th Aug 1933 | Box 152 \ 3 scan0135 | |
| Letter from C.G. Vokes Limited chasing a response regarding silencer end pieces for a Vokes-Blanvac Exhaust Silencer. | 7th Sep 1933 | Box 152 \ 3 scan0136 | |
| Letter to Messrs C.G. Vokes Ltd regarding a delay in despatching silencer end pieces due to works closure for the annual holiday. | 8th Sep 1933 | Box 152 \ 3 scan0137 | |
| Sending a formal order for two Burgess air silencers that were received for testing. | 12th Sep 1933 | Box 152 \ 3 scan0138 | |
| Requesting an order be placed for two sample Burgess Air Silencers received for testing on Bentley cars. | 12th Sep 1933 | Box 152 \ 3 scan0139 | |
| Letter from C.G. Vokes Limited inviting a representative to their stand at the Shipping, Engineering & Machinery Exhibition. | 14th Sep 1933 | Box 152 \ 3 scan0140 | |
| Letter from C.G. Vokes Limited regarding suggestions for improving an air cleaner and discussing their patented 'Five Ply' filter pattern. | 15th Sep 1933 | Box 152 \ 3 scan0141 | |
| Letter from C.G. Vokes Limited concerning the efficiency and silencing effects of fabric air filters for S.U. pattern carburettors. | 1st Jul 1933 | Box 152 \ 3 scan0142 | |
| Design drawing for the Phantom II Air Silencer. | 1st Jul 1933 | Box 152 \ 3 scan0143 | |
| Letter to C.G. Vokes Ltd. regarding suggestions for improving the air cleaner and filter on silencers. | 20th Sep 1933 | Box 152 \ 3 scan0144 | |
| Phantom II Air Silencer being sent to C.G. Vokes Ltd. for an air cleaner to be fitted. | 21th Sep 1933 | Box 152 \ 3 scan0145 | |
| Letter to C.G. Vokes Ltd. regarding the design and efficiency of gauze waves for an air cleaner. | 29th Sep 1933 | Box 152 \ 3 scan0146 | |
| Investigation into the causes and potential solutions for rattles and crackles in silencers. | 12th Dec 1933 | Box 152 \ 3 scan0147 | |
| Fitting a new Phantom II exhaust system and a Vokes Blanvac silencer to car 20-EX. | 4th Jan 1934 | Box 152 \ 3 scan0148 | |
| Modifications to the 20/25 HP and P.2. silencers to eliminate rattles and crackles. | 9th Jan 1934 | Box 152 \ 3 scan0149 | |
| Recurring failures ('spitting') of Bentley silencers and a proposed modification. | 9th Jan 1934 | Box 152 \ 3 scan0150 | |
| Modifications and trials for a Phantom II exhaust silencer, with potential for use on the 25HP car. | 12th Jan 1934 | Box 152 \ 3 scan0151 | |
| Testing a new Phantom II exhaust silencer design to reduce cooling crackle. | 27th Jan 1934 | Box 152 \ 3 scan0152 | |
| Improvements to Phantom II exhaust silencers and their potential for standardisation. | 30th Jan 1934 | Box 152 \ 3 scan0153 | |
| Standardisation of parts document for a Vokes Air Cleaner. | 20th Dec 1933 | Box 152 \ 3 scan0154 | |
| Letter from D.L. Ellis of the National Physical Laboratory inquiring about the trial of a silencer design. | 22th Jan 1934 | Box 152 \ 3 scan0155 | |
| Letter from International Corporation Limited regarding the 'St. Jacques Silencer'. | 30th Apr 1934 | Box 152 \ 3 scan0156 | |
| Page 2 of a letter from International Corporation Limited regarding engine silencers. | 1st Apr 1934 | Box 152 \ 3 scan0157 | |
| Presentation document for The St. Jacques Silencer by International Corporation Ltd. | 1st Apr 1934 | Box 152 \ 3 scan0158 | |
| Notes on the St. Jacques patent silencer, detailing its essential characteristics and principles of operation. | 1st Apr 1934 | Box 152 \ 3 scan0159 | |
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