| Description | Date | Identifier | |
| The substitution of taper bolts and pins with parallel ones in gearboxes for all cars to simplify assembly and reduce cost. | 20th Apr 1938 | Box 136 \ 4 scan0216 | |
| Instruction to note modifications to rubber buffers for gearbox tie rods for B.III, B.50, and Wraith models. | 22th Apr 1938 | Box 136 \ 4 scan0217 | |
| Unsatisfactory method of attaching cones to gears and proposing an alternative using parallel pins or bolts. | 27th Apr 1938 | Box 136 \ 4 scan0218 | |
| Requesting a modification to the gearbox selector mechanism. | 4th May 1938 | Box 136 \ 4 scan0219 | |
| Production of new Bentley III and Bentley 50 Mk.II type gearboxes. | 9th Jun 1938 | Box 136 \ 4 scan0220 | |
| The unusual drag and noise issues observed in a 25 HP Vauxhall Gearbox. | 11th Jun 1938 | Box 136 \ 4 scan0221 | |
| Blueprint G.CD.761 showing the layout of the change gear lever and driver's seat positions for Bentley 111 and 50 models. | 28th Jun 1938 | Box 136 \ 4 scan0222 | |
| Cheaper gearbox dipstick and requesting a cost estimate for a modified version. | 18th Aug 1938 | Box 136 \ 4 scan0223 | |
| Modifications for the Bentley 111, 50 and 60 gearbox. | 18th Aug 1938 | Box 136 \ 4 scan0224 | |
| Modifications to the Bentley 50 and Bentley 60 gearbox. | 22th Aug 1938 | Box 136 \ 4 scan0225 | |
| Experimental use of a Buick-type synchromesh for the Bentley 50 and 60 gearbox. | 22th Aug 1938 | Box 136 \ 4 scan0226 | |
| Proposed eccentric fulcrum pin for providing adjustment for the selector levers for B.111, B.50 and B.60 gearboxes. | 22th Aug 1938 | Box 136 \ 4 scan0227 | |
| Modification to a gearbox, specifically the attachment of an oil scoop to the 2nd motion shaft. | 23th Aug 1938 | Box 136 \ 4 scan0228 | |
| Setscrew tests for securing gearboxes directly to aluminium crankcases. | 24th Aug 1938 | Box 136 \ 4 scan0229 | |
| Modified servo drive and alterations for B.111, B.50 and B.60 gear boxes. | 25th Aug 1938 | Box 136 \ 4 scan0230 | |
| Comparison of gearbox backlash between a Rover and a Bentley 11. | 25th Aug 1938 | Box 136 \ 4 scan0231 | |
| Scheme detailing modifications to a gearbox, including thicker washers and wider gears. | 30th Aug 1938 | Box 136 \ 4 scan0232 | |
| Necessary changes to the actuating gear leverages for the B.3, B.50, and B.60 gearboxes. | 5th Sep 1938 | Box 136 \ 4 scan0233 | |
| Modification to gearbox selector guide forks to prevent leakage. | 17th Oct 1938 | Box 136 \ 4 scan0234 | |
| Modifications to the Selector jaw attachment on the Bentley 111 and 50 Gearbox to facilitate assembly. | 18th Oct 1938 | Box 136 \ 4 scan0235 | |
| Request for details on a temporary scheme to fit aluminium bronze wearing pads to operating forks on B.111 and B.50 gearboxes. | 29th Oct 1938 | Box 136 \ 4 scan0236 | |
| Letter requesting views on supplying a specific journal bearing, mentioning competition from American suppliers. | 2nd Nov 1938 | Box 136 \ 4 scan0237 | |
| Letter from Ransome & Marles Bearing Co. comparing their MJ.40-G bearing with a New Departure bearing. | 4th Nov 1938 | Box 136 \ 4 scan0238 | |
| Letter from Ransome & Marles Bearing Co. discussing bearings used on a Buick Viceroy Saloon and arranging a future meeting. | 4th Nov 1938 | Box 136 \ 4 scan0239 | |
| Apology for misstating the number of balls in a bearing and a request for a quotation for 500 bearings. | 5th Nov 1938 | Box 136 \ 4 scan0240 | |
| Letter to Hoffmann Manufacturing Co. Ltd. requesting a price for two types of bearings. | 5th Nov 1938 | Box 136 \ 4 scan0241 | |
| Letter to Messrs. Delco-Remy & Hyatt Ltd. requesting a price quote for 500 New Departure bearings, No.43308. | 5th Nov 1938 | Box 136 \ 4 scan0242 | |
| Letter from Delco-Remy & Hyatt Ltd responding to an enquiry for New Departure Bearings No.43308. | 7th Nov 1938 | Box 136 \ 4 scan0243 | |
| Quotation from Delco-Remy & Hyatt Ltd for 500 New Departure single row snap ring type ball bearings. | 7th Nov 1938 | Box 136 \ 4 scan0244 | |
| Letter from The Hoffmann Manufacturing Co. Ltd. acknowledging an enquiry. | 7th Nov 1938 | Box 136 \ 4 scan0245 | |
| Quotation letter from The Hoffmann Manufacturing Co. Ltd. for special and medium type ball bearings. | 9th Nov 1938 | Box 136 \ 4 scan0246 | |
| Page 2 of a letter from The Hoffmann Manufacturing Co., Ltd. | 9th Nov 1938 | Box 136 \ 4 scan0247 | |
| Letter from Ransome & Marles Bearing Co. Ltd. providing a quotation for 500 MJ.40.G type bearings. | 12th Nov 1938 | Box 136 \ 4 scan0248 | |
| Quotation from Ransome & Marles Bearing Co. Ltd. for Medium type Ball Journal Bearings. | 12th Nov 1938 | Box 136 \ 4 scan0249 | |
| Letter from Hoffmann Manufacturing Co. Ltd. to Rolls Royce Ltd. correcting a quotation for special bearings. | 18th Nov 1938 | Box 136 \ 4 scan0250 | |
| Requesting a covering order for three bearings ordered from Messrs. Ransome & Marles. | 22th Nov 1938 | Box 136 \ 4 scan0251 | |
| Requesting an official covering order for special bearings that have already been received from Ransome & Marles. | 30th Nov 1938 | Box 136 \ 4 scan0252 | |
| Modifications to gearbox selector shafts for models B.111, B.50, and B.60. | 30th Nov 1938 | Box 136 \ 4 scan0253 | |
| Letter to Messrs. Delco-Remy & Hyatt Ltd. declining to order a special bearing as a cheaper alternative has been found. | 1st Dec 1938 | Box 136 \ 4 scan0254 | |
| Modification to the B.111 and B.50 gearbox selector lever. | 7th Dec 1938 | Box 136 \ 4 scan0255 | |
| Letter from Fischer Bearings Company regarding an alternative for pinion bearings. | 12th Dec 1938 | Box 136 \ 4 scan0256 | |
| Temporary modification scheme for B.V, B.50 and B.60 gearboxes. | 14th Dec 1938 | Box 136 \ 4 scan0257 | |
| Letter to Ransome & Marles Bearing Co. Ltd. requesting a further two DMJT.40 bearings for a Wraith gearbox. | 15th Dec 1938 | Box 136 \ 4 scan0258 | |
| Order to be placed for two bearings with grooves for snap rings. | 15th Dec 1938 | Box 136 \ 4 scan0259 | |
| Letter from Ransome & Marles Bearing Co. Ltd. confirming an order for two DMJT.40.J. bearings. | 16th Dec 1938 | Box 136 \ 4 scan0260 | |
| The discomfort caused by hot floorboards in the 20-HP car and proposing experimental work on ventilation. | 5th Mar 1923 | Box 136 \ 5 scan0001 | |
| Response to a complaint regarding hot floor boards on the 20 HP car model. | 6th Mar 1923 | Box 136 \ 5 scan0002 | |
| Tests to reduce heat under the scuttle of a 4-Goshawk-11 car. | 1st Aug 1923 | Box 136 \ 5 scan0003 | |
| Investigating and proposing solutions for heat under the scuttle of a 20 HP car. | 16th Aug 1923 | Box 136 \ 5 scan0004 | |
| Methods to reduce engine heat felt in the cabin, discussing ventilation and insulation improvements. | 12th Sep 1923 | Box 136 \ 5 scan0005 | |
| Methods for reducing engine heat and the temperature of air under the bonnet. | 3rd Oct 1923 | Box 136 \ 5 scan0006 | |
| Requesting tests on a new cork matting for floorboards to reduce heat to the driver's feet. | 3rd Oct 1923 | Box 136 \ 5 scan0007 | |
| The use of cork matting on front footboards to reduce heat and noise. | 4th Oct 1923 | Box 136 \ 5 scan0008 | |
| Testing cork matting to resolve heat issues with the front floorboards. | 4th Oct 1923 | Box 136 \ 5 scan0009 | |
| From CJ to Hs requesting a report on the issue of hot floorboards. | 28th Nov 1923 | Box 136 \ 5 scan0010 | |
| Experiments with cork matting and leather flaps to mitigate hot floorboards. | 28th Nov 1923 | Box 136 \ 5 scan0011 | |
| Short memo inquiring about the progress made on resolving the problem of hot floor boards. | 28th Nov 1923 | Box 136 \ 5 scan0012 | |
| Confirming the completion of tests on hot floorboards and that a report will follow shortly. | 12th Dec 1923 | Box 136 \ 5 scan0013 | |
| From BJ to Hs requesting an update on an overheating issue. | 6th Dec 1923 | Box 136 \ 5 scan0014 | |
| Vehicle overheating and the potential solution of fitting a larger radiator. | 11th Dec 1923 | Box 136 \ 5 scan0015 | |
| From JS to Hs requesting a copy of a reply concerning hot floorboards. | 12th Dec 1923 | Box 136 \ 5 scan0016 | |
| Cover note from CJ to Hs. requesting a report on the matter of hot floorboards. | 28th Nov 1923 | Box 136 \ 5 scan0017 | |
| Incomplete report on hot floorboards, advising a more complete version will follow. | 14th Dec 1923 | Box 136 \ 5 scan0018 | |
| Results of tests for insulating the exhaust to reduce heat on the floorboards and under the scuttle. | 1st Dec 1923 | Box 136 \ 5 scan0019 | |
| Tests to reduce heat on the floorboards and under the scuttle of a 40/50 HP car. | 12th Jul 1923 | Box 136 \ 5 scan0020 | |
| Modifications to reduce floor and scuttle temperature. | 12th Jul 1923 | Box 136 \ 5 scan0021 | |
| Modifications to the 40/50 undershield and testing cork floorboard coverings. | 12th Jul 1923 | Box 136 \ 5 scan0022 | |
| Tests with a double dash air insulated dashboard to address complaints of cold feet. | 11th Dec 1923 | Box 136 \ 5 scan0023 | |
| Test report detailing temperature readings in different parts of a car under various modifications to reduce heat ingress. | 11th Dec 1923 | Box 136 \ 5 scan0024 | |
| Graph showing the relationship between radiator water temperature and the air temperature at the rear of the fan. | 17th Oct 1923 | Box 136 \ 5 scan0025 | |
| Graph-based report on experiments to reduce vehicle floor-board temperature. | 28th Dec 1923 | Box 136 \ 5 scan0026 | |
| Lingering smell in chassis no. 2323 and the suggestion to fit a roof ventilator. | 12th Dec 1923 | Box 136 \ 5 scan0027 | |
| From CJ to Hs requesting a standardisation sheet regarding heat under floor boards. | 1st Jan 1924 | Box 136 \ 5 scan0028 | |
| Design of modifications to reduce heat under the scuttle and considering alterations for front brake parts. | 1st Jan 1924 | Box 136 \ 5 scan0029 | |
| Unresolved issue of exhaust fumes entering the car body, referencing two specific chassis. | 10th Jan 1924 | Box 136 \ 5 scan0030 | |
| Plan to reduce heat under floorboards by fitting new pedals in conjunction with the rollout of 4-wheel brakes. | 26th Jan 1924 | Box 136 \ 5 scan0031 | |
| Issue of heat on the floorboards and under the scuttle. | 28th Jan 1924 | Box 136 \ 5 scan0032 | |
| Letter detailing five partial cures for heat transfer issues from the floorboards and scuttle area. | 16th Jan 1924 | Box 136 \ 5 scan0033 | |
| Modifications to prevent noise and heat conduction through the floor and pedal area. | 18th Jan 1924 | Box 136 \ 5 scan0034 | |
| Attaching a report from Springfield concerning heat on the floorboards and under the scuttle. | 1st Feb 1924 | Box 136 \ 5 scan0035 | |
| Experiments to diagnose and resolve fume ingress into the cabin of Chassis No. 2323. | 19th Mar 1924 | Box 136 \ 5 scan0036 | |
| Internal memorandum discussing customer complaints of fumes and sickness caused by poor car body design. | 19th Mar 1924 | Box 136 \ 5 scan0037 | |
| Road tests investigating issues with fumes entering the car body on chassis number 2323. | 18th Mar 1924 | Box 136 \ 5 scan0038 | |
| Requesting an update on alterations to cars with front brakes intended to reduce heat for the driver. | 1st Jul 1924 | Box 136 \ 5 scan0039 | |
| Alteration to reduce heat under the scuttle and floorboards on cars being tested in France. | 1st Jul 1924 | Box 136 \ 5 scan0040 | |
| Inquiring about the issuance of a standardisation sheet for alterations to reduce heat under the floorboards. | 27th Nov 1924 | Box 136 \ 5 scan0041 | |
| Improvements to reduce heat under the floorboards, which are introduced with the standardisation for 4-wheel brakes. | 28th Nov 1924 | Box 136 \ 5 scan0042 | |
| Querying if alterations for heat under front floorboards are for existing cars and if the cost is covered, or for new 'U' series cars only. | 6th Dec 1924 | Box 136 \ 5 scan0043 | |
| Confirming the fitment of features to address heat under floorboards for conversion cars and 'U' series onwards. | 12th Dec 1924 | Box 136 \ 5 scan0044 | |
| Complaints, causes, and proposed solutions for overheating in the rear interior of closed Phantom cars. | 14th Jul 1926 | Box 136 \ 5 scan0045 | |
| Problem of excessive heat from the aluminium dashboard in the front compartment of cars. | 23th Jul 1932 | Box 136 \ 5 scan0046 | |
| Tests to reduce heat in the Phantom II car's driving compartment, focusing on dashboard insulation and exhaust pipe lagging. | 2nd Sep 1932 | Box 136 \ 5 scan0047 | |
| Vehicle body issues including hot air leaks, lever drafts, and floorboard fitting. | 2nd Feb 1932 | Box 136 \ 5 scan0048 | |
| Preventing air leaks through pedal holes and the challenges of obtaining reliable chassis test data. | 2nd Sep 1932 | Box 136 \ 5 scan0049 | |
| Blueprint for a draught shield around the brake lever quadrant for a Phantom II chassis. | 27th Aug 1932 | Box 136 \ 5 scan0050 | |
| Cross-sectional diagrams illustrating insulation materials for a vehicle's dashboard and floorboards. | 9th Sep 1932 | Box 136 \ 5 scan0051 | |
| Issue of heat in the driving compartment of the Phantom II and 20/25 models. | 5th Sep 1932 | Box 136 \ 5 scan0052 | |
| Technical memorandum discussing heat management in the driving compartment, including dashboard radiation and hot air leaks. | 7th Sep 1932 | Box 136 \ 5 scan0053 | |
| Issues with scuttle ventilation and heat management, with suggestions for improvements. | 7th Sep 1932 | Box 136 \ 5 scan0054 | |
| List of recommendations for vehicle body and ventilation improvements. | 8th Sep 1932 | Box 136 \ 5 scan0055 | |
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