| Description | Date | Identifier | |
| Invoice for felt from Vol-Crepe Ltd. that was delivered without an official purchase order. | 12th Apr 1935 | Box 138 \ 1 scan0164 | |
| Letter discussing the cost and use of Balsam wool asbestos-lined material for insulating dashboards. | 13th Apr 1935 | Box 138 \ 1 scan0165 | |
| Letter to Vol-Crepe Limited acknowledging receipt of felt samples for testing. | 13th Apr 1935 | Box 138 \ 1 scan0166 | |
| Official order for two pieces of Brown Vola-Felt from Vol-Crepe Ltd. | 15th Apr 1935 | Box 138 \ 1 scan0167 | |
| Invoice from The British Tyre & Rubber Co.Ltd for a piece of rubber and requesting authorization for payment. | 24th Apr 1935 | Box 138 \ 1 scan0168 | |
| Request to place an official order for a piece of rubber from The British Tyre & Rubber Co. Ltd. | 26th Apr 1935 | Box 138 \ 1 scan0169 | |
| Requesting the fitting of a noise-insulated dashboard to an experimental car. | 29th Apr 1935 | Box 138 \ 1 scan0170 | |
| Warning about the noise insulation scheme reducing accelerator pedal travel. | 3rd May 1935 | Box 138 \ 1 scan0171 | |
| Article on using concertina packing around pedals to prevent fume entry, suggesting an experimental test on the Spectre model. | 1st May 1935 | Box 138 \ 1 scan0172 | |
| Experiments on the mechanical silencing of engines, including the use of hydraulic tappets and bonnet insulation. | 10th May 1935 | Box 138 \ 1 scan0173 | |
| Series of experiments to reduce engine noise on a 1-B-IV Bentley car. | 10th May 1935 | Box 138 \ 1 scan0174 | |
| Modifications and experiments to reduce engine noise using covers and a plain bonnet. | 10th May 1935 | Box 138 \ 1 scan0175 | |
| Photograph showing three disassembled metal engine components, including a cover with six cutouts. | 17th May 1938 | Box 138 \ 1 scan0176 | |
| Blueprint detailing the design and installation of a silent rocker cover for a Bentley engine. | 17th May 1938 | Box 138 \ 1 scan0177 | |
| Ventilating schemes, comparing concertina packing with a felt gland around the pedals to prevent fumes. | 13th May 1935 | Box 138 \ 1 scan0178 | |
| Unrecorded delivery of black fibre sheet from Park Ward & Co. Ltd. | 14th May 1935 | Box 138 \ 1 scan0179 | |
| Mechanical silencing of engines, noting concern that tests were done on a Bentley first but acknowledging the lessons are applicable to RR. | 15th May 1935 | Box 138 \ 1 scan0180 | |
| Confirming receipt of a sheet of Black Fibre and requesting it be booked in. | 15th May 1935 | Box 138 \ 1 scan0181 | |
| Sending drawing LeC.4490 showing the noise insulated dashboard for a Bentley. | 18th May 1935 | Box 138 \ 1 scan0182 | |
| Attaching a print showing the rocker cover position to a report on engine silence. | 22th May 1935 | Box 138 \ 1 scan0183 | |
| Sample tin of Linell's Rubber Cement for the body isolation scheme. | 28th May 1935 | Box 138 \ 1 scan0184 | |
| Design changes for a 20/25 HP model, focusing on a noise-insulated dashboard and gas-tight floorboards. | 30th May 1935 | Box 138 \ 1 scan0185 | |
| Query regarding a decision on an insulation scheme for a Bentley vehicle. | 5th Jun 1935 | Box 138 \ 1 scan0186 | |
| Weight increase caused by a noise insulation scheme on experimental cars. | 6th Jun 1935 | Box 138 \ 1 scan0187 | |
| Letter from coachbuilders Park Ward & Co Ltd confirming the dispatch of Balsam Wool asbestos lining. | 12th Jun 1935 | Box 138 \ 1 scan0188 | |
| Letter to Messrs. Park, Ward & Co. Ltd. acknowledging receipt of asbestos-lined Balsam Wool. | 14th Jun 1935 | Box 138 \ 1 scan0189 | |
| Query regarding noise insulation material under the rear seats, comparing aluminium used by Park Ward to the specified sheet metal or an alternative of thick felt. | 19th Jun 1935 | Box 138 \ 1 scan0190 | |
| Drawings for a noise-insulated dashboard, gas sealing for pedals, and a relocated radiator drain cock for the Spectre project. | 21th Jun 1935 | Box 138 \ 1 scan0191 | |
| Weight discrepancy in the noise insulation scheme for the Bentley. | 27th Jun 1935 | Box 138 \ 1 scan0192 | |
| Weight comparison between present and proposed insulation schemes on a Bentley. | 27th Jun 1935 | Box 138 \ 1 scan0193 | |
| Noise insulation, specifically whether to remove an aluminium seat board and a proposal to reduce the weight of the scheme. | 27th Jun 1935 | Box 138 \ 1 scan0194 | |
| Weight calculation discrepancy for a noise insulation scheme on a Bentley. | 28th Jun 1935 | Box 138 \ 1 scan0195 | |
| Noise insulation testing with different seat board materials and reducing weight. | 28th Jun 1935 | Box 138 \ 1 scan0196 | |
| Arranging a meeting to discuss a noise insulation scheme and an aluminium seat board. | 1st Jul 1935 | Box 138 \ 1 scan0197 | |
| Recommendation for an abbreviated noise insulation scheme to reduce weight on Bentley cars. | 2nd Aug 1935 | Box 138 \ 1 scan0198 | |
| Noise insulation scheme for an experimental Bentley car. | 8th Aug 1935 | Box 138 \ 1 scan0199 | |
| Sales letter from Western Electric Company offering a new noise and vibration meter for testing automobiles. | 28th Aug 1935 | Box 138 \ 1 scan0200 | |
| Page 2 of a letter from Western Electric Company Limited regarding making an appointment. | 6th Sep 1935 | Box 138 \ 1 scan0201 | |
| Results and recommendation for an abbreviated noise insulation scheme for a Bentley. | 6th Sep 1935 | Box 138 \ 1 scan0202 | |
| Piece of glass silk from Chance Bros. & Co. Ltd., sent to the Experimental Dept. for testing against felt for heat and sound insulation. | 12th Sep 1935 | Box 138 \ 1 scan0203 | |
| Instruction to fit a noise insulation scheme to a Bentley 6-B-IV chassis for a 10,000-mile test in France. | 13th Sep 1935 | Box 138 \ 1 scan0204 | |
| Implementation of a noise insulation scheme for a Bentley with a Van Vooren body. | 13th Sep 1935 | Box 138 \ 1 scan0205 | |
| Letter from Western Electric regarding the demonstration of a sound meter and enclosing related research papers. | 19th Sep 1935 | Box 138 \ 1 scan0206 | |
| Request for a set of noise insulation parts for a Bentley trials car to test an anti-noise scheme. | 19th Sep 1935 | Box 138 \ 1 scan0207 | |
| Noise insulation scheme for a Bentley saloon. | 20th Sep 1935 | Box 138 \ 1 scan0208 | |
| Letter to The Western Electric Co. Ltd. regarding their Sound Meter and Acoustic Consulting Service. | 20th Sep 1935 | Box 138 \ 1 scan0209 | |
| Promotional brochure for 'Hairlok' moulded rubberised hair, marketed for comfort and noise insulation. | 1st Feb 1932 | Box 138 \ 1 scan0210 | |
| Informational leaflet describing the properties and uses of Hairlok upholstery material. | 24th Oct 1935 | Box 138 \ 1 scan0211 | |
| Drawing LeC.4779 for radiator stays with a noise-insulated dashboard on a Bentley. | 24th Oct 1935 | Box 138 \ 1 scan0212 | |
| Standardisation of parts for a noise insulation scheme to improve the silence of cars. | 22th Oct 1935 | Box 138 \ 1 scan0213 | |
| Cost comparison document for an old versus a new part, including tooling and equipment costs. | 22th Aug 1935 | Box 138 \ 1 scan0214 | |
| Experimental design of engine noise insulation for the 25-29 HP engine. | 4th Dec 1935 | Box 138 \ 1 scan0215 | |
| The implementation of a dash insulation scheme for Bentley chassis. | 13th Dec 1935 | Box 138 \ 1 scan0216 | |
| Letter from Siemens-Schuckert describing a noise measuring instrument for automobile and aircraft engines. | 2nd Jan 1936 | Box 138 \ 1 scan0217 | |
| Page 2 of a letter from Siemens-Schuckert (Great Britain) Ltd. describing a noise measuring instrument. | 2nd Jan 1936 | Box 138 \ 1 scan0218 | |
| Photograph of a portable electronic testing apparatus, likely a sound level meter, in its case with a separate microphone unit. | 2nd Jan 1936 | Box 138 \ 1 scan0219 | |
| Photograph of portable electronic testing equipment in a carrying case, connected to a separate microphone or speaker component. | 7th Jan 1936 | Box 138 \ 1 scan0220 | |
| Letter to Siemens-Schuckert Ltd. requesting a demonstration of noise measuring instruments. | 7th Jan 1936 | Box 138 \ 1 scan0221 | |
| Letter from The Capac Company Ltd regarding Bin-aural instruments for detecting noise and wear in mechanisms. | 7th Jan 1936 | Box 138 \ 1 scan0222 | |
| Letter from Siemens-Schuckert regarding a demonstration of new Noise Meters. | 8th Jan 1936 | Box 138 \ 1 scan0223 | |
| Internal request to place an order for rubber parts with British Goodrich Co. Ltd. | 27th Jan 1936 | Box 138 \ 1 scan0224 | |
| Cancelling the requirement for the dashboard isolation scheme on the 36-EX, advising it will be done by Coachbuilders with felt and carpet. | 4th Feb 1936 | Box 138 \ 1 scan0225 | |
| Requesting a decision on the dashboard for Phantom III chassis Nos. 36 & 37-EX. | 4th Feb 1936 | Box 138 \ 1 scan0226 | |
| Official order for a sheet of rubber from The British Goodrich Co. | 11th Feb 1936 | Box 138 \ 1 scan0227 | |
| Request to place an official order for a sheet of rubber from the British Goodrich Rubber Co. Ltd. | 13th Feb 1936 | Box 138 \ 1 scan0228 | |
| Noise insulation for the Phantom III and requesting recommendations for a revised guide for coachbuilders. | 29th Feb 1936 | Box 138 \ 1 scan0229 | |
| Internal request to place an order for various rubber buffers with The British Tyre & Rubber Co.Ltd. | 11th Mar 1936 | Box 138 \ 1 scan0230 | |
| The dispatch of one set of buffers for car 34-EX to Park Ward & Co. and requesting instructions. | 9th Mar 1936 | Box 138 \ 1 scan0231 | |
| Requesting payment for invoices of rubber buffers from The British Tyre & Rubber Co. Ltd. | 6th Mar 1936 | Box 138 \ 1 scan0232 | |
| Standardisation and application of a noise insulation scheme for the 4¼-litre Bentley chassis. | 12th Mar 1936 | Box 138 \ 1 scan0233 | |
| Request regarding the removal of the centralised lubrication tank and the required length for oil and petrol taps. | 12th Mar 1936 | Box 138 \ 1 scan0234 | |
| The results and recommendations for fitting sound insulation to a 4¼ litre Bentley car. | 13th Mar 1936 | Box 138 \ 1 scan0235 | |
| The payment of an invoice from the British Tyre & Rubber Co. Ltd for rubber parts. | 13th Mar 1936 | Box 138 \ 1 scan0236 | |
| Sound insulation felt for mats in 25 HP Bentley and Phantom III cars. | 14th Mar 1936 | Box 138 \ 1 scan0237 | |
| Official order for parts received from the British Tyre & Rubber Co. | 16th Mar 1936 | Box 138 \ 1 scan0238 | |
| The noise insulation treatment for the first big bore Bentley in the Experimental Department. | 18th Mar 1936 | Box 138 \ 1 scan0239 | |
| Addition of sound insulation to the 4¼ Litre Bentley chassis. | 18th Mar 1936 | Box 138 \ 1 scan0240 | |
| The sourcing of felt for mats and recommendations for soundproofing materials. | 18th Mar 1936 | Box 138 \ 1 scan0241 | |
| Requesting confirmation to proceed with a noise insulation scheme for coach-builders. | 20th Mar 1936 | Box 138 \ 1 scan0242 | |
| Noise insulation on a 4 1/2 litre Bentley. | 21th Mar 1936 | Box 138 \ 1 scan0243 | |
| Dashboard insulation and mounting components for a 4¼ litre Bentley, and collaboration with coachbuilders. | 31th Mar 1936 | Box 138 \ 1 scan0244 | |
| Noise insulation scheme and carpet material for chassis B-8-GA and B-60-GA. | 31th Mar 1936 | Box 138 \ 1 scan0245 | |
| Testing and release of the 22-G-V car with Silent Bloc mounting. | 4th Apr 1936 | Box 138 \ 1 scan0246 | |
| Requesting an official order for 32 rubber blocks from British Goodrich Burton. | 9th Apr 1936 | Box 138 \ 1 scan0247 | |
| Official order for Tenax Carpet Fasteners. | 15th Apr 1936 | Box 138 \ 1 scan0248 | |
| Request to G. Beaton & Son Ltd for the supply of Tenax carpet fasteners and a quote for a custom extension bolt. | 15th Apr 1936 | Box 138 \ 1 scan0249 | |
| Attached slip from the Ruberoid Co. | 17th Apr 1936 | Box 138 \ 1 scan0250 | |
| Letter to A.G. Brockway declining the use of a special wadding material due to unsatisfactory results. | 17th Apr 1936 | Box 138 \ 1 scan0251 | |
| Inquiry to G. Beaton & Sons Ltd. regarding the stock and supply of Tenax carpet fasteners. | 17th Apr 1936 | Box 138 \ 1 scan0252 | |
| Letter from Siemens-Schuckert regarding the availability of Noise Meters for demonstration. | 21th Apr 1936 | Box 138 \ 1 scan0253 | |
| Letter to Siemens-Schuckert declining the use of their Peak Noise Meter due to extraneous noises in a motor car. | 22th Apr 1936 | Box 138 \ 1 scan0254 | |
| The procurement of Tenax carpet fasteners and associated bolts for a dashboard isolation scheme. | 22th Apr 1936 | Box 138 \ 1 scan0255 | |
| Official order for an additional two dozen Tenax Carpet Fasteners. | 22th Apr 1936 | Box 138 \ 1 scan0256 | |
| Letter from Siemens-Schuckert (Great Britain) Ltd. regarding the upcoming availability of a Universal noise meter. | 24th Apr 1936 | Box 138 \ 1 scan0257 | |
| Issues with the jacking system on a Bentley, particularly the inability to use the jack when a tyre is off. | 24th Apr 1936 | Box 138 \ 1 scan0258 | |
| Request for test results on Seapak insulation for smell when exposed to heat and moisture. | 25th Apr 1936 | Box 138 \ 1 scan0259 | |
| Request for the supply of various rubber blocks to The British Goodrich Co. Ltd. | 28th Apr 1936 | Box 138 \ 1 scan0260 | |
| The results of a heat and dampness test on Seapak insulation material. | 29th Apr 1936 | Box 138 \ 1 scan0261 | |
| Request to place an official order for various rubber blocks from the British Goodrich Co. Ltd. | 29th Apr 1936 | Box 138 \ 1 scan0262 | |
| Despatch of a Bentley dashboard noise insulation model to Paris. | 8th May 1936 | Box 138 \ 1 scan0263 | |
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