| Description | Date | Identifier | |
| Modification to the 25/30 exhaust system to rectify a fouling issue with the third crossmember. | 16th Jun 1936 | Box 104 \ 2 scan0216 | |
| Standardisation of a flattened exhaust pipe snout to reduce exhaust boom on the 25/30 HP model. | 16th Jun 1936 | Box 104 \ 2 scan0217 | |
| Letter to Burgess Products Co. Ltd. regarding the fitting and testing of an exhaust silencer on a 25/30 HP car. | 18th Jun 1936 | Box 104 \ 2 scan0218 | |
| Letter from Burgess Products Company arranging a meeting to demonstrate an experimental exhaust silencer fitted to a 25/30 HP car. | 19th Jun 1936 | Box 104 \ 2 scan0219 | |
| Suggesting a modification to the 25/30 Exhaust System to fix a fouling issue and for a Depot Sheet to be issued. | 20th Jun 1936 | Box 104 \ 2 scan0220 | |
| Official order be placed with Burgess Products Co. | 25th Jun 1936 | Box 104 \ 2 scan0221 | |
| File note regarding the 20/25 Exhaust Booms and related production updates. | 2nd Jul 1936 | Box 104 \ 2 scan0222 | |
| Rattling exhaust system on the modern 25 HP car due to the silencer fouling a frame cross member. | 12th Jun 1936 | Box 104 \ 2 scan0223 | |
| Letter from Burgess Products Company regarding an experimental exhaust silencer and acoustic pads. | 23th Jun 1936 | Box 104 \ 2 scan0224 | |
| Letter from Burgess Products Company concerning air filters and a sample of Zonolite for experimental use. | 1st Apr 1936 | Box 104 \ 2 scan0225 | |
| Product bulletin detailing the methods of installation for Burgess Acousti-Pad sound absorbent lining in ventilation systems. | 1st Apr 1936 | Box 104 \ 2 scan0226 | |
| Installation guide for Burgess Acousti-Pad sound-absorbing duct lining. | 1st Jan 1936 | Box 104 \ 2 scan0227 | |
| Technical bulletin explaining noise measurement with a comparative chart of decibel levels for various sounds. | 1st Mar 1936 | Box 104 \ 2 scan0228 | |
| Guide explaining the decibel scale for sound intensity and its practical application in noise level calculations. | 1st Jan 1936 | Box 104 \ 2 scan0229 | |
| Letter to Burgess Products Co. apologising for a delay and postponing further tests on a car. | 15th Jul 1936 | Box 104 \ 2 scan0230 | |
| Letter from Burgess Products Company to the Experimental Department regarding a recent visit and a proposed future meeting. | 16th Jul 1936 | Box 104 \ 2 scan0231 | |
| Letter from Burgess Products Company Ltd regarding a missed meeting and the supply of silencers and carburettor filter elements. | 21th Aug 1936 | Box 104 \ 2 scan0232 | |
| Letter to Burgess Products Co. Ltd. arranging a meeting to discuss filter elements and a 25/30 HP exhaust system. | 24th Aug 1936 | Box 104 \ 2 scan0233 | |
| Proposal to manufacture Phantom II exhaust silencers using aluminised mild steel instead of Staybrite to prevent surface breakdown. | 25th Mar 1936 | Box 104 \ 2 scan0234 | |
| Use of malleable iron for exhaust manifolds on the 25/30 HP chassis. | 26th Aug 1936 | Box 104 \ 2 scan0235 | |
| Substitution of Staybright steel with Aluminized mild steel for Phantom II & 25/30 HP exhaust silencers. | 28th Aug 1936 | Box 104 \ 2 scan0236 | |
| Use of malleable iron for 25/30 HP exhaust manifolds. | 28th Aug 1936 | Box 104 \ 2 scan0237 | |
| Official order be placed with Burges Products Co. Ltd. for various materials. | 28th Aug 1936 | Box 104 \ 2 scan0238 | |
| Letter from Burgess Products Company Ltd regarding experimental work on exhaust silencers and air filter elements. | 31th Aug 1936 | Box 104 \ 2 scan0239 | |
| Letter from Burgess Products Company Ltd. regarding the sound-dampening material 'Dedenet'. | 12th Sep 1936 | Box 104 \ 2 scan0240 | |
| Letter confirming the dispatch of four hand-made air filter element samples and discussing production details. | 12th Sep 1936 | Box 104 \ 2 scan0241 | |
| Advertisement for the Burgess Oil-Bath Air Cleaner, detailing its operation and features. | 5th Sep 1936 | Box 104 \ 2 scan0242 | |
| Advertisement for Nickel Alloy Steels for use in motor vehicle construction. | 5th Sep 1936 | Box 104 \ 2 scan0243 | |
| Enquiry for 25/30 HP exhaust manifolds, discussing casting thickness and cost with Ley's Malleable Casting Co. | 22th Sep 1936 | Box 104 \ 2 scan0244 | |
| Cost comparison note between a standard manifold and a malleable iron alternative, showing a saving. | 7th May 1970 | Box 104 \ 2 scan0245 | |
| The cost-effectiveness and proposed testing of malleable iron exhaust manifolds for the 25/30 HP model. | 30th Sep 1936 | Box 104 \ 2 scan0246 | |
| The testing of sample spherical pads for an exhaust system on car 22-G-V. | 2nd Oct 1936 | Box 104 \ 2 scan0247 | |
| Despatching two 25/30 HP exhaust silencers treated with the Webb anti-rust process. | 10th Oct 1936 | Box 104 \ 2 scan0248 | |
| Instruction memo regarding the materials and assembly for a 25/30 HP exhaust system, to be fitted to a GAE-20 chassis. | 12th Oct 1936 | Box 104 \ 2 scan0249 | |
| Reduced material order for a 'G' series exhaust system pending tests on a new design. | 15th Oct 1936 | Box 104 \ 2 scan0250 | |
| Standardisation of materials and anti-rust treatment for the 25/30 HP and Phantom III exhaust systems. | 26th Oct 1936 | Box 104 \ 2 scan0251 | |
| Staybrite sleeve for a 25/30 HP exhaust tail pipe. | 28th Oct 1936 | Box 104 \ 2 scan0252 | |
| The 25/30 HP & Phantom III exhaust systems, specifically about a quotation for silencers from Messrs. Webbs Treatments Ltd. | 3rd Nov 1936 | Box 104 \ 2 scan0253 | |
| Request for a swan neck nozzle to be made for a 25/30 HP exhaust system. | 12th Nov 1936 | Box 104 \ 2 scan0254 | |
| Internal request to order mild steel sheets and a sparking plug from Burgess Products Ltd. | 14th Nov 1936 | Box 104 \ 2 scan0255 | |
| Exhaust boom on car GUL-1, found to be caused by an extension piece. | 20th Nov 1936 | Box 104 \ 2 scan0256 | |
| Exhaust boom issue caused by a plated extension piece on a 25/30 HP car. | 21th Nov 1936 | Box 104 \ 2 scan0257 | |
| Standardisation of Gandy spherical exhaust support washers for the 25/30 HP model. | 21th Oct 1936 | Box 104 \ 2 scan0258 | |
| Statement on the estimated nil cost of extra Jigs, Tools and Bought Out Equipment. | 14th Oct 1936 | Box 104 \ 2 scan0259 | |
| Deleting the spherical union from the carburetter air intake pipe on the 25/30 HP 'P2' Series chassis. | 10th Dec 1936 | Box 104 \ 2 scan0260 | |
| Suggestion to delete the spherical joint union from the carburetter air intake pipe for the 25/30 HP Chassis air silencer. | 2nd Dec 1936 | Box 104 \ 2 scan0261 | |
| Recommendation to replace special lagging straps with Jubilee Clips on 25/30-HP & Bentley expansion boxes for cost savings. | 30th Dec 1936 | Box 104 \ 2 scan0262 | |
| Approving the use of Jubilee Clips for lagging on the 25/30 HP & Bentley Expansion Box. | 5th Jan 1937 | Box 104 \ 2 scan0263 | |
| Delay in the standardization of 25/30 HP exhaust fittings due to a failure during testing. | 11th Jan 1937 | Box 104 \ 2 scan0264 | |
| Urgent request for the delivery status of exhaust manifolds for the 25/30 HP and Phantom III models. | 11th Jan 1937 | Box 104 \ 2 scan0265 | |
| Confirming a cost check which found that Jubilee Clips are the cheapest option for the 25/30HP & Bentley exhaust system. | 12th Jan 1937 | Box 104 \ 2 scan0266 | |
| Cost analysis comparing Jubilee clips against a lagging strap for expansion boxes on 25/30 HP and Bentley models. | 6th Jan 1937 | Box 104 \ 2 scan0267 | |
| Cost comparison of jubilee clips versus straps for the 25/30 HP and Bentley exhaust system. | 14th Jan 1937 | Box 104 \ 2 scan0268 | |
| Quotation from Harborough Aircraft Construction Co. Ltd. for Phantom III silencers and another part. | 17th Dec 1936 | Box 104 \ 2 scan0269 | |
| Proceeding with nickel-plated mild steel lagging covers for the 25/30 exhaust fittings. | 18th Jan 1937 | Box 104 \ 2 scan0270 | |
| Requesting the fitting of a nickel-plated exhaust system with a chromium extension piece to car 18.G.1V. | 25th Jan 1937 | Box 104 \ 2 scan0271 | |
| Standardisation of parts for oil seals on the countershaft. | 22th Jan 1937 | Box 104 \ 2 scan0272 | |
| Estimation of the cost for new tools and production details for the 'P2' series chassis. | 22th Jan 1937 | Box 104 \ 2 scan0273 | |
| Power output graph comparing a 25/30 HP engine's performance with both an open exhaust and a complete system, against a 5.7 C/R Buick Series 40 engine. | 15th Oct 1937 | Box 104 \ 2 scan0274 | |
| Collection of memos on the design and testing of exhaust systems to reduce noise on 25 HP and Phantom III models. | 15th Oct 1937 | Box 104 \ 2 scan0275 | |
| Modifications to cure exhaust drone on the Phantom III and a complaint regarding the size of the front expansion box. | 15th Oct 1937 | Box 104 \ 2 scan0276 | |
| Issues with exhaust manifold studs and water leaks on the 25/30 HP model. | 12th Jan 1938 | Box 104 \ 2 scan0277 | |
| The widening of the Goshawk frame and track to accommodate 4-wheel brakes. | 25th Jun 1924 | Box 104 \ 3 scan0001 | |
| Authorisation sheet No.2 for a necessary change to the anchorage of the 'India' model's frame under-truss. | 7th Mar 1925 | Box 104 \ 3 scan0002 | |
| Design and details of a body subframe for India across several schemes. | 21th Apr 1925 | Box 104 \ 3 scan0003 | |
| Bumping test of an India chassis, investigating the failure of the rear dumb iron. | 1st May 1925 | Box 104 \ 3 scan0004 | |
| Rear axle bumping test for a 20 HP 'India' chassis, detailing spring and dumb iron failures. | 6th May 1925 | Box 104 \ 3 scan0005 | |
| Urgent testing of body subframes on various chassis and car models. | 10th Jun 1925 | Box 104 \ 3 scan0006 | |
| Modifications to springs, side levers, sub-frames, and the status of gearbox production. | 10th Jun 1925 | Box 104 \ 3 scan0007 | |
| Timeline and requirements for introducing new chassis parts, such as side levers and gearcases, after a 10,000-mile trial. | 13th Jun 1925 | Box 104 \ 3 scan0008 | |
| Cabriolet designs for an 'India' subframe and the reuse of a Landaulette body. | 13th Jun 1925 | Box 104 \ 3 scan0009 | |
| Design modifications and feedback for the 'India' sub-frames. | 13th Jun 1925 | Box 104 \ 3 scan0010 | |
| Stiffening of a body sub-frame joggle based on test results and forwarding a drawing. | 6th Jun 1925 | Box 104 \ 3 scan0011 | |
| Secret memo agreeing to a suggestion to change the 'India' subframe on model GF-68 to the latest design. | 1st Jun 1925 | Box 104 \ 3 scan0012 | |
| Despatch of a 20 HP subframe to Messrs. Barkers, intended for a Cabriolet body. | 1st Jul 1925 | Box 104 \ 3 scan0013 | |
| Goshawk sub-frame at Barkers, requesting parts to avoid work stoppage and suggesting chassis specifications. | 18th Jul 1925 | Box 104 \ 3 scan0014 | |
| Chassis modifications, body fittings, and test plans for various car models. | 11th Sep 1925 | Box 104 \ 3 scan0015 | |
| Report disagreeing with a long chassis for the Sports car and recommending new wings and windscreen. | 12th Jun 1925 | Box 104 \ 3 scan0016 | |
| Letter to coachbuilders confirming modifications to a 20 HP chassis, including windscreen adjustments and revised rear wheel clearances. | 25th Sep 1925 | Box 104 \ 3 scan0017 | |
| Telegram regarding a production delay for a Barkers India Sub frame, awaiting rubber suspension blocks. | 29th Sep 1925 | Box 104 \ 3 scan0018 | |
| Requesting an experiment to modify frame tie-bars as per Mr. Royce's wishes. | 21th Dec 1925 | Box 104 \ 3 scan0019 | |
| Expressing concerns and recommending further experiments on a chassis underframe design. | 21th Dec 1925 | Box 104 \ 3 scan0020 | |
| Requesting the issuance of a standardization sheet for a 20 HP chassis frame. | 16th Mar 1926 | Box 104 \ 3 scan0021 | |
| Communication regarding the weight of a Barker patent cabriolet de ville subframe and the correct fitting of floorboards. | 20th Mar 1926 | Box 104 \ 3 scan0022 | |
| Standardisation of a chassis part, moving the frame joggle 1 inch further back to improve coachwork. | 18th Mar 1926 | Box 104 \ 3 scan0023 | |
| Desirability of fitting subframes to the 40/50 and 20 HP chassis. | 22th Apr 1926 | Box 104 \ 3 scan0024 | |
| Letter from Springfield to Derby acknowledging receipt of a Standardization Sheet for Frame X No.5380. | 7th May 1926 | Box 104 \ 3 scan0025 | |
| Request for a simple frame deflection and weight measurement on the Phantom and 20 HP models. | 19th Jul 1926 | Box 104 \ 3 scan0026 | |
| Frame deflection test and results for the New Phantom and 20 HP car models. | 23th Aug 1926 | Box 104 \ 3 scan0027 | |
| The breakage of Phantom step irons, attributing the cause to rough roads and battery weight, with proposed solutions. | 5th Mar 1927 | Box 104 \ 3 scan0028 | |
| Flexibility and fractures of step irons on 20 HP and 40/50 HP models, proposing stronger designs and battery placement solutions. | 11th Mar 1927 | Box 104 \ 3 scan0029 | |
| Short internal memo confirming an action, typed over a carbon copy of another document. | 11th Oct 1937 | Box 104 \ 3 scan0030 | |
| Proposed strengthened step iron for the 20 HP model. | 25th Mar 1927 | Box 104 \ 3 scan0031 | |
| Lowering the chassis frame by using a smaller hypoid back axle bevel gear. | 6th May 1927 | Box 104 \ 3 scan0032 | |
| Proposed modifications to the new 20 HP chassis, including lowering it and using 19' wheels. | 5th Jul 1927 | Box 104 \ 3 scan0033 | |
| The construction of new India chassis frames. | 16th Jul 1927 | Box 104 \ 3 scan0034 | |
| Modifications to the frame for the 'India 3 and 4' chassis, referencing drawing numbers. | 20th Aug 1927 | Box 104 \ 3 scan0035 | |
| The frame and engine components for the 'India 3' 20 HP trial car in France. | 9th May 1927 | Box 104 \ 3 scan0036 | |
| Examination of a Hooper Cabriolet de Ville experiencing rattles and knocks, focusing on incorrect subframe supports and floorboards. | 7th Sep 1927 | Box 104 \ 3 scan0037 | |
| Continuation of instructions regarding the fitting of subframe supports, dash brackets, and footboards. | 13th Sep 1938 | Box 104 \ 3 scan0038 | |
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