| Description | Date | Identifier | |
| Letter to Fescol Limited regarding an estimate for Fescolising a Bentley exhaust system. | 19th Dec 1935 | Box 86 \ 3 scan0119 | |
| Letter from FESCOL LIMITED regarding nickel deposition on exhaust pipes and silencers. | 19th Dec 1935 | Box 86 \ 3 scan0120 | |
| Letter from Fescol Limited discussing a proposal and estimated pricing for electro-chemical deposition on exhaust system components. | 23th Dec 1935 | Box 86 \ 3 scan0121 | |
| Request to build parts for a Bentley exhaust system, specifying materials and processes. | 31th Dec 1935 | Box 86 \ 3 scan0122 | |
| Request for an additional Bentley exhaust downtake pipe and front expansion box for 'Fescolising'. | 6th Jan 1936 | Box 86 \ 3 scan0123 | |
| Request to fabricate an experimental Bentley exhaust manifold in sheet metal to fit car B-23-AE. | 6th Jan 1936 | Box 86 \ 3 scan0124 | |
| Advertisement for Metallisation Limited's metal spraying services. | 7th Jan 1936 | Box 86 \ 3 scan0125 | |
| Quotation for aluminising mild steel silencer casings. | 7th Jan 1936 | Box 86 \ 3 scan0126 | |
| Request to manufacture one exhaust tail pipe adapter for testing on a Bentley tail pipe. | 9th Jan 1936 | Box 86 \ 3 scan0127 | |
| Letter to Metallization Ltd. regarding the treatment of a Bentley Exhaust Manifold. | 9th Jan 1936 | Box 86 \ 3 scan0128 | |
| Letter to Messrs. Fescol Ltd. regarding Bentley exhaust parts being sent for 'Fescolising' treatment. | 13th Jan 1936 | Box 86 \ 3 scan0129 | |
| Cost comparison for a Bentley exhaust system, comparing the costs of Staybrite and Mild Steel materials. | 1st Jan 1948 | Box 86 \ 3 scan0130 | |
| Specification for a Bentley exhaust system for car 4-B-IV. | 16th Jan 1936 | Box 86 \ 3 scan0131 | |
| Request to manufacture a Bentley exhaust downtake pipe and front expansion box for anti-corrosion treatment. | 22th Jan 1936 | Box 86 \ 3 scan0132 | |
| Request to place an order with Fescol Ltd. for treating an exhaust pipe and a pipe bend. | 24th Jan 1936 | Box 86 \ 3 scan0133 | |
| Invoice from Fescol Ltd. for treating a pipe bend and a Bentley exhaust pipe, requesting an official order for payment. | 22th Jan 1936 | Box 86 \ 3 scan0134 | |
| Letter from The Light Production Co. Ltd. regarding the supply of an experimental set of 3 3/4' pistons. | 23th Jan 1936 | Box 86 \ 3 scan0135 | |
| Letter to Metallization Ltd. requesting the 'Aluminizing' of a Bentley exhaust downtake pipe and front expansion box. | 24th Jan 1936 | Box 86 \ 3 scan0136 | |
| Blueprints for Large Bore Bentley Chassis exhaust fittings and a List of Parts (L.O.P.). | 27th Jan 1936 | Box 86 \ 3 scan0137 | |
| Making exhaust system lagging covers from 24 S.W.G. nickel-plated mild steel. | 28th Jan 1936 | Box 86 \ 3 scan0138 | |
| Specification for the B-56-BN exhaust system. | 30th Jan 1936 | Box 86 \ 3 scan0139 | |
| Letter to Metallisation Ltd. regarding the 'Aluminizing' of a Bentley Manifold and pipe. | 31th Jan 1936 | Box 86 \ 3 scan0140 | |
| Letter to Fescol Ltd. regarding sending a Bentley intermediate pipe for a 'FESCOLIZING' process. | 3rd Feb 1936 | Box 86 \ 3 scan0141 | |
| Letter to Durion Ltd. requesting suggestions for chromium plating the inside of an exhaust system. | 4th Feb 1936 | Box 86 \ 3 scan0142 | |
| Comparing the design, complexity, cost, and performance of the Rolls-Royce air silencer against the Packard air silencer. | 4th Feb 1936 | Box 86 \ 3 scan0143 | |
| Letter from Durion Limited following a works visit to discuss the treatment of an exhaust downtake pipe. | 11th Feb 1936 | Box 86 \ 3 scan0144 | |
| Letter to Electro-Chemical Engineers regarding the plating of a downtake pipe and expansion box. | 13th Feb 1936 | Box 86 \ 3 scan0145 | |
| Payment for an invoice from H.H.Cooke & Sons for handmade silencer components. | 26th Feb 1936 | Box 86 \ 3 scan0146 | |
| Requesting the creation of a detail drawing and the manufacture of a modified exhaust manifold for a 4¼ Litre Bentley. | 27th Feb 1936 | Box 86 \ 3 scan0147 | |
| Reallocation of an 'Aluminized' exhaust system to car B-56-BN for testing after an accident prevented its use on car 4-B-IV. | 27th Feb 1936 | Box 86 \ 3 scan0148 | |
| Official order for a hand-made silencer shell, inner tube, and connecting pipe. | 28th Feb 1936 | Box 86 \ 3 scan0149 | |
| Invoice from Metallisation Ltd for aluminizing Bentley exhaust parts. | 28th Feb 1936 | Box 86 \ 3 scan0150 | |
| Request to place an official order with Metallisation Ltd. for aluminizing a Bentley Exhaust Manifold and Pipe. | 29th Feb 1936 | Box 86 \ 3 scan0151 | |
| Request to manufacture a 1 1/2' diameter Bentley tail pipe for testing purposes on B-23-AE. | 2nd Mar 1936 | Box 86 \ 3 scan0152 | |
| High cost of exhaust systems and strategies for reduction through material and design changes. | 3rd Mar 1936 | Box 86 \ 3 scan0153 | |
| Cost and simplification of engine silencing systems, specifically the 20/25 model and intake silencers for the Bentley chassis. | 5th Mar 1936 | Box 86 \ 3 scan0154 | |
| High cost of a Vokes Air Filter, comparing it to other models and seeking alternatives. | 28th Feb 1936 | Box 86 \ 3 scan0155 | |
| Request to produce four experimental expansion boxes for a Bentley exhaust system. | 4th Mar 1936 | Box 86 \ 3 scan0156 | |
| Letter to Lane & Girvan Ltd. regarding faulty black enamelling on Bentley exhaust manifolds. | 10th Mar 1936 | Box 86 \ 3 scan0157 | |
| Letter to Mr. Philip E. Wightman enclosing a copy of a letter sent to Messrs. Lane & Girvan Ltd. | 10th Mar 1936 | Box 86 \ 3 scan0158 | |
| Instruction to use larger 7/32' rivets instead of 5/32' for the 4 1/4 Litre Bentley inlet silencer fixing. | 10th Mar 1936 | Box 86 \ 3 scan0159 | |
| Chassis costs, specifically comparing the design and fixing of exhaust and intake silencers against those on a Packard car. | 20th Mar 1936 | Box 86 \ 3 scan0160 | |
| Page 2 of a memo comparing the cost and design of a unit against a Packard Air Silencer. | 20th Mar 1936 | Box 86 \ 3 scan0161 | |
| Analysis of exhaust system losses on the big bore Bentley engine compared to the small bore. | 24th Mar 1936 | Box 86 \ 3 scan0162 | |
| Cost reductions for the Bentley Air Silencer. | 30th Mar 1936 | Box 86 \ 3 scan0163 | |
| Letter to Burgess Products Company requesting different types of air filters for experimental purposes. | 1st Apr 1936 | Box 86 \ 3 scan0164 | |
| Letter to the General Sales Manager of The Burgess Products Co. enclosing a copy of another letter. | 1st Apr 1936 | Box 86 \ 3 scan0165 | |
| Request to place an official order for treating a Bentley Exhaust Manifold with a heat-resisting enamel process. | 8th May 1936 | Box 86 \ 3 scan0166 | |
| Letter regarding the sending of a Bentley exhaust manifold for heat-resisting enamel treatment in a gloss finish. | 8th May 1936 | Box 86 \ 3 scan0167 | |
| Specifications for an exhaust system undergoing a 15,000-mile test. | 22th May 1936 | Box 86 \ 3 scan0168 | |
| Instances of cracked exhaust manifolds on specific Bentley chassis. | 23th May 1936 | Box 86 \ 3 scan0169 | |
| Customer complaints of squeaking from the exhaust system suspension and proposing a simpler rubber mounting solution. | 25th May 1936 | Box 86 \ 3 scan0170 | |
| Failure of rubber mountings for an exhaust system due to overheating. | 28th May 1936 | Box 86 \ 3 scan0171 | |
| Issue of cracked exhaust manifolds on Bentley chassis. | 30th May 1936 | Box 86 \ 3 scan0172 | |
| Proposal for cost reduction on the Bentley exhaust system by changing from Staybright steel to aluminized mild steel. | 5th Jun 1936 | Box 86 \ 3 scan0173 | |
| Complete specification for a new Bentley exhaust system, listing materials and standards for various components. | 5th Jun 1936 | Box 86 \ 3 scan0174 | |
| Comparison photograph of three different types of engine or chassis mountings. | 22th Jun 1936 | Box 86 \ 3 scan0175 | |
| 'titter' issue with a Bentley exhaust manifold and proposing a new design with an internal baffle. | 22th Jun 1936 | Box 86 \ 3 scan0176 | |
| Requesting to fit a new exhaust system with an 'Aluminized' mild steel downtake pipe to car B-56-BN. | 2nd Jul 1936 | Box 86 \ 3 scan0177 | |
| Letter to 'The Autocar' magazine requesting contact details for a company that performs the 'Webb process' for rust-proofing. | 7th Aug 1936 | Box 86 \ 3 scan0178 | |
| Letter from The Autocar magazine regarding a company that handles the Webb method of rust-proofing. | 8th Aug 1936 | Box 86 \ 3 scan0179 | |
| Inquiry to Webb Treatments Ltd. regarding their rust-proofing process, specifically for exhaust systems. | 11th Aug 1936 | Box 86 \ 3 scan0180 | |
| Letter from Webb Metal Treatments Ltd. confirming a visit from their Technical Director to Derby. | 12th Aug 1936 | Box 86 \ 3 scan0181 | |
| Letter to Webb Metal Treatments Ltd. arranging an interview with Mr. S. E. Roberts. | 13th Aug 1936 | Box 86 \ 3 scan0182 | |
| Letter to Webb Metal Treatments Ltd. regarding sending parts for anti-rust treatment. | 19th Aug 1936 | Box 86 \ 3 scan0183 | |
| Letter from Webb Metal Treatments Ltd. chasing the delivery of a Rear Silencer and Tail Pipe for treatment. | 26th Aug 1936 | Box 86 \ 3 scan0184 | |
| Letter from The Ferro Enameling Co. Ltd. regarding developments in enamel for exhaust manifolds. | 27th Aug 1936 | Box 86 \ 3 scan0185 | |
| Extract from a letter from Ferro Enamel Corporation regarding porcelain enamel for automobile manifolds. | 15th Aug 1936 | Box 86 \ 3 scan0186 | |
| Letter to The Ferro Enameling Co. Ltd. regarding the treatment of a Bentley exhaust manifold. | 1st Sep 1936 | Box 86 \ 3 scan0187 | |
| Modification to the joint on the outer shell of a Bentley Air Silencer. | 5th Sep 1936 | Box 86 \ 3 scan0188 | |
| Letter to Webb Treatments Ltd. chasing the return of silencer parts sent for anti-rust treatment. | 9th Sep 1936 | Box 86 \ 3 scan0189 | |
| Letter from Webb Metal Treatments Ltd. regarding the dispatch of silencer parts for treatment. | 10th Sep 1936 | Box 86 \ 3 scan0190 | |
| Standardisation of parts for a modified Bentley exhaust system, substituting Aluminized Mild Steel for Staybright Steel. | 5th Jun 1936 | Box 86 \ 3 scan0191 | |
| Estimated cost of extra Jigs, Tools and Equipment for the 'J' Series chassis production. | 9th Jul 1936 | Box 86 \ 3 scan0192 | |
| Requesting the fitting of a new production exhaust system to a test vehicle. | 16th Sep 1936 | Box 86 \ 3 scan0193 | |
| Letter from the Experimental Department to Ferro Enamelling Co. Ltd., inquiring about a Bentley exhaust manifold sent for enamel treatment. | 16th Sep 1936 | Box 86 \ 3 scan0194 | |
| Letter from The Ferro Enameling Co. regarding the enameling of a Bentley type manifold. | 19th Sep 1936 | Box 86 \ 3 scan0195 | |
| Letter from Webb Metal Treatments Ltd. acknowledging receipt of a missing case and discussing the welding of silencer shells. | 24th Sep 1936 | Box 86 \ 3 scan0196 | |
| Letter to Webb Metal Treatments Ltd. regarding the anti-rust treatment of silencer shells. | 23th Sep 1936 | Box 86 \ 3 scan0197 | |
| Invoice from Allen White for a complete silencer, which the stores department has no record of receiving. | 2nd Oct 1936 | Box 86 \ 3 scan0198 | |
| Requesting to book in one complete silencer in planished steel from manufacturer Allen White. | 5th Oct 1936 | Box 86 \ 3 scan0199 | |
| Letter from The Ferro Enameling Co. regarding a delay in processing manifolds due to an enamel shipment being held at Liverpool. | 6th Oct 1936 | Box 86 \ 3 scan0200 | |
| New method for joining exhaust pipes on an experimental Bentley using a stirrup-type clip. | 12th Nov 1936 | Box 86 \ 3 scan0201 | |
| New designs for chromium-plated exhaust tail pipes for all car models. | 19th Nov 1936 | Box 86 \ 3 scan0202 | |
| Request to ascertain the cost and delivery of additional nickel plating equipment. | 26th Nov 1936 | Box 86 \ 3 scan0203 | |
| Failed clip on a downtake pipe, its potential modification, and testing of a similar system. | 5th Mar 1937 | Box 86 \ 3 scan0204 | |
| Fault with an exhaust system clip slipping off the lagging and a proposed solution. | 8th Mar 1937 | Box 86 \ 3 scan0205 | |
| The failure of an exhaust system flange after 4,700 miles. | 11th Apr 1937 | Box 86 \ 3 scan0206 | |
| Proposed new exhaust suspension system for a Bentley model. | 17th Jun 1937 | Box 86 \ 3 scan0207 | |
| Cover note for a sketch of Wraith II rubber strips adapted for a 4 1/4 Bentley exhaust system. | 30th Jun 1937 | Box 86 \ 3 scan0208 | |
| Instruction to build and fit an exhaust system suspension to a Bentley 6-B-IV car for a 10,000-mile test in France. | 30th Jun 1937 | Box 86 \ 3 scan0209 | |
| Work order to manufacture and fit a new front exhaust expansion box for car 5-B-IV. | 1st Jul 1937 | Box 86 \ 3 scan0210 | |
| Extracts from memos on the design of exhaust systems for the 25 HP and Phantom III models. | 15th Oct 1937 | Box 86 \ 3 scan0211 | |
| Modifications to the exhaust system to resolve an exhaust drone and questioning the sizing of the front expansion box. | 15th Oct 1937 | Box 86 \ 3 scan0212 | |
| Issues with exhaust system suspension, suggesting the use of rubber suspension to mitigate rattles and squeaks. | 10th Jun 1936 | Box 86 \ 3 scan0213 | |
| Exhaust systems for in-line six-cylinder engines, comparing single and separate systems. | 9th Apr 1938 | Box 86 \ 3 scan0214 | |
| Report outlining the objectives for a series of tests on exhaust manifold and silencer combinations for a B.2J unit. | 13th Apr 1938 | Box 86 \ 3 scan0215 | |
| Comparison of engine performance between 3 and 4 port manifolds with single and double outlets. | 13th Apr 1938 | Box 86 \ 3 scan0216 | |
| Performance comparison graph and analysis of 3-port and 4-port exhaust manifolds with and without silencers. | 13th Apr 1938 | Box 86 \ 3 scan0217 | |
| Blueprint graph comparing engine performance with different exhaust manifold and silencer setups. | 13th Apr 1938 | Box 86 \ 3 scan0218 | |
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