| Description | Date | Identifier | |
| Stock levels and costs for a Bakelite push-button switch cover. | 7th Feb 1924 | Box 172 \ 3 img071 | |
| Standardisation of a 40/50 condenser with 50% increased capacity for repair and replacement. | 31th Jan 1924 | Box 172 \ 3 img072 | |
| Extract discussing the condition of points removed from a chassis after 9,500 miles of use. | 30th Jan 1924 | Box 172 \ 3 img073 | |
| Performance of a 40/50 condenser with increased capacity after a 2,600 mile trial. | 1st Jan 1924 | Box 172 \ 3 img074 | |
| Bench test report on standard ir-platinum points and a 40/50 mica condenser of larger capacity. | 8th Jan 1924 | Box 172 \ 3 img075 | |
| Test report on a 40/50 Mica Condenser of larger capacity, No. 4M. | 9th Jan 1924 | Box 172 \ 3 img076 | |
| Returning a standardisation sheet for an improved type contact breaker for specific magnetos. | 14th May 1924 | Box 172 \ 3 img077 | |
| Standardisation of an improved type contact breaker for E.O.6 and R.O.I magnetos to increase durability and reduce noise. | 17th Mar 1924 | Box 172 \ 3 img078 | |
| Arrangement of dynamo and magneto drives. | 9th May 1924 | Box 172 \ 3 img079 | |
| Standardisation of distributor gears on the magneto to reduce noise. | 12th Jan 1925 | Box 172 \ 3 img080 | |
| Standardisation of chassis parts, specifically aluminium brush holders for the 40/50 starter motor. | 22th Apr 1925 | Box 172 \ 3 img081 | |
| 40/50 starter motor with aluminium brush holders after a 10,335-mile test on car 98-NK. | 1st Apr 1925 | Box 172 \ 3 img082 | |
| Standardisation of a battery ignition contact breaker rubbing block made of bone grey fibre. | 21th Jul 1925 | Box 172 \ 3 img083 | |
| Standardisation of a modified distributor head and base to provide better ventilation and reduce corrosion. | 19th Dec 1925 | Box 172 \ 3 img084 | |
| Experimental test report on the blackening of ignition contact points due to oil vapour. | 19th Dec 1925 | Box 172 \ 3 img085 | |
| Standardisation of a modified distributor head and base to improve ventilation. | 19th Dec 1925 | Box 172 \ 3 img086 | |
| Test report and circulation memo regarding the standardisation of chassis parts. | 20th Dec 1925 | Box 172 \ 3 img087 | |
| Standardisation of chassis parts for a rigid fixed contact point support for cutout. | 5th Feb 1926 | Box 172 \ 3 img088 | |
| Standardisation of chassis parts, specifically contact points from a second source of supply. | 5th Feb 1926 | Box 172 \ 3 img089 | |
| Standardisation of an electrical cutout moving contact point spring support. | 25th May 1926 | Box 172 \ 3 img090 | |
| Standardisation of a moulded Redmanol case for the ignition coil to reduce cost and improve appearance. | 31th May 1926 | Box 172 \ 3 img091 | |
| Standardisation of an ammeter made by Messrs. Elliott Bros. for chassis parts. | 27th May 1926 | Box 172 \ 3 img092 | |
| Alteration to the starter actuator box lubrication to prevent the seizing of pins. | 24th Sep 1926 | Box 172 \ 3 img093 | |
| Standardisation of an ignition coil with a finer primary winding (Redmanol Case). | 16th Sep 1926 | Box 172 \ 3 img094 | |
| Standardisation report for an ignition governor oil relay piston using metal packing rings. | 23th Sep 1926 | Box 172 \ 3 img095 | |
| Standardisation of securing the distribution box cover with round thumb screws. | 22th Sep 1926 | Box 172 \ 3 img096 | |
| Standardisation of a 40/50 Dynamo with narrow brushes and an increased air gap from .015' to .020'. | 11th May 1927 | Box 172 \ 3 img097 | |
| Questionnaire regarding the standardisation of a new chassis part. | 27th Feb 1928 | Box 172 \ 3 img098 | |
| Standardisation of tungsten contact points for battery ignition, comparing them to platinum points. | 6th Sep 1927 | Box 172 \ 3 img099 | |
| Standardisation of chassis parts concerning further contact points for battery ignition. | 12th Sep 1923 | Box 172 \ 3 img100 | |
| Road test report detailing the performance of tungsten contact points over various mileages. | 6th Sep 1927 | Box 172 \ 3 img101 | |
| Standardisation of a ballast resistance nickel wire for the chassis. | 9th Sep 1927 | Box 172 \ 3 img102 | |
| Form concerning the standardisation of a chassis part for the 40/50 and 20 HP models. | 23th Sep 1927 | Box 172 \ 3 img103 | |
| Standardisation of a Watford Sleeveless Type EW6 Magneto. | 8th Nov 1927 | Box 172 \ 3 img104 | |
| Implementation and associated costs of a new standardized chassis part. | 27th Nov 1928 | Box 172 \ 3 img105 | |
| Standardisation of a battery ignition contact breaker to improve the performance and life of tungsten points. | 14th Nov 1927 | Box 172 \ 3 img106 | |
| Questionnaire form regarding the standardisation of a chassis part, outlining implementation details and costs. | 9th Apr 1928 | Box 172 \ 3 img107 | |
| Standardisation of the battery box in the chassis frame. | 7th Nov 1927 | Box 172 \ 3 img108 | |
| Standardisation form for a new part to be fitted to a G-2-B series chassis. | 12th Nov 1928 | Box 172 \ 3 img109 | |
| Standardisation of 'Maconite' insulated H.T. wires for the chassis. | 14th May 1928 | Box 172 \ 3 img110 | |
| Form for the standardisation of chassis parts, specifically regarding a 'Timcam' insulator. | 19th Mar 1932 | Box 172 \ 3 img111 | |
| Standardisation of a battery ignition bakelite distributor rotor of the mushroom type. | 12th May 1928 | Box 172 \ 3 img112 | |
| Introduction of new standardized parts for 40/50 HP and 20 HP chassis. | 27th Aug 1928 | Box 172 \ 3 img113 | |
| Standardisation of a 40/50 HP. Dynamo - 28 Slot Armature. | 20th Jul 1928 | Box 172 \ 3 img114 | |
| Standardisation of Chassis Parts form for Drawing No. OC.06, detailing a new part for the H. series chassis. | 28th Jan 1929 | Box 172 \ 3 img115 | |
| Standardisation of the electrical connection of the cutout shunt coil to the dynamo terminal. | 5th Sep 1928 | Box 172 \ 3 img116 | |
| Standardisation of a Phantom II starter motor main armature return spring. | 30th Nov 1929 | Box 172 \ 3 img117 | |
| Standardisation proposal for an improved design of ignition coil for chassis parts. | 4th Apr 1930 | Box 172 \ 3 img118 | |
| The design improvements for an ignition coil. | 11th Jun 1930 | Box 172 \ 3 img119 | |
| Standardisation of chassis parts, specifically for aluminium ignition tubes without ebonite covering. | 11th Jun 1930 | Box 172 \ 3 img120 | |
| Standardisation of an accessory distribution box for chassis parts. | 20th Jun 1930 | Box 172 \ 3 img121 | |
| Standardisation of Morganite EG2 grade brushes for 40/50 & 'S.S.' dynamos as an alternative. | 14th Mar 1929 | Box 172 \ 3 img122 | |
| Proposal to standardize the Ferranti Ammeter as an alternative source of supply to the standard Elliott ammeter. | 25th Jun 1930 | Box 172 \ 3 img123 | |
| Standardisation of a switchbox, distribution box, and field resistance unit for dynamo output control. | 18th Jun 1930 | Box 172 \ 3 img124 | |
| Standardisation proposal for a straight battery series connecting link. | 10th Jul 1930 | Box 172 \ 3 img125 | |
| Standardisation of a 48 coil armature dynamo with pole piece modification for high output. | 18th Jun 1930 | Box 172 \ 3 img126 | |
| Standardisation of chassis parts, specifically Watford Magnetos type EW6A fitted with Tungsten contact points. | 12th Sep 1930 | Box 172 \ 3 img127 | |
| Standardisation report for a backing light and switch. | 26th Aug 1930 | Box 172 \ 3 img128 | |
| Standardisation of a moulded Dagenite vent plug for Phantom II batteries. | 31th Oct 1930 | Box 172 \ 3 img129 | |
| Letter to G.J. Mead of United Aircraft & Transport Corp regarding an upcoming visit to America with a 3 1/2 litre Bentley. | 27th Sep 1933 | Box 173 \ 1 img001 | |
| Letter from The United Aircraft & Transport Corporation to W. A. Robotham arranging a meeting. | 17th Oct 1933 | Box 173 \ 1 img002 | |
| Letter from Guy W. Vaughan to Mr. W. A. Robotham concerning an upcoming visit to the States. | 14th Oct 1933 | Box 173 \ 1 img003 | |
| Letter to J.F. Inskip regarding a forthcoming visit to America with a Bentley and a discussion on business. | 25th Oct 1933 | Box 173 \ 1 img004 | |
| Letter from the Experimental Department requesting a contact at Harrison Radiators for an upcoming visit to America. | 1st Nov 1933 | Box 173 \ 1 img005 | |
| Letter to Captain A.F. Lyon in Dayton, Ohio, regarding a planned visit to America with a new Bentley car. | 1st Nov 1933 | Box 173 \ 1 img006 | |
| Letter to G.J. Mead of The United Aircraft & Transport Corp. postponing a visit to America. | 1st Nov 1933 | Box 173 \ 1 img007 | |
| Letter to Mr. C. W. Vaughan postponing a visit to America until early January for the New York Show. | 1st Nov 1933 | Box 173 \ 1 img008 | |
| Letter from the President of the American branch regarding an upcoming visit with a Bentley. | 6th Nov 1933 | Box 173 \ 1 img009 | |
| Letter from George J. Mead to W. A. Robotham regarding a postponed visit to Connecticut. | 16th Nov 1933 | Box 173 \ 1 img010 | |
| Letter of thanks to the Vacuum Oil Co. Ltd. for assistance with an impending visit to the United States. | 20th Nov 1933 | Box 173 \ 1 img011 | |
| Letter from the Vacuum Oil Company to a Rolls-Royce employee regarding travel arrangements to the United States. | 21th Nov 1933 | Box 173 \ 1 img012 | |
| Letter to Wright Aeronautical Corp. arranging a factory visit for an employee interested in US manufacturing methods. | 30th Nov 1933 | Box 173 \ 1 img013 | |
| Letter to G.J. Mead in the USA regarding travel plans and a proposed factory visit for Mr. Coverley. | 30th Nov 1933 | Box 173 \ 1 img014 | |
| Letter requesting assistance for an experimental production engineer, Mr. Coverly, visiting America to study manufacturing methods. | 30th Nov 1933 | Box 173 \ 1 img015 | |
| Letter regarding an experimental production engineer's visit to America to study production methods. | 30th Nov 1933 | Box 173 \ 1 img016 | |
| Letter sending a letter of introduction for the President of the Cleveland Graphite Bronze Company. | 5th Dec 1933 | Box 173 \ 1 img017 | |
| Letter from Ford Motor Company Ltd. regarding a visit to Dearborn and a potential order for a 12-cylinder Lincoln. | 8th Dec 1933 | Box 173 \ 1 img018 | |
| Letter from Ford Motor Company regarding a visit to their Detroit plant. | 8th Dec 1933 | Box 173 \ 1 img019 | |
| Letter to Ford Motor Co requesting an introduction for a trip to the USA after visiting the Lincoln factory. | 9th Dec 1933 | Box 173 \ 1 img020 | |
| Letter requesting assistance with obtaining a New York driving licence ahead of a trip with a Bentley. | 11th Dec 1933 | Box 173 \ 1 img021 | |
| Letter from Wright Aeronautical Corporation regarding Mr. Coverley's visit to their plant. | 15th Dec 1933 | Box 173 \ 1 img022 | |
| Letter from Vacuum Oil Company regarding the delayed travel of Mr. Coverly to the United States. | 22th Dec 1933 | Box 173 \ 1 img023 | |
| Letter from the Vacuum Oil Company regarding the use of boiled linseed oil for castings and the analysis of a used Mobiloil EP sample. | 22th Dec 1933 | Box 173 \ 1 img024 | |
| Letter to R. Chilton of The Wright Aeronautical Corporation confirming travel plans to meet in January. | 27th Dec 1933 | Box 173 \ 1 img025 | |
| Letter to The Vacuum Oil Co. Ltd. regarding a cancelled sailing and a discussion on oil for hypoid gears. | 27th Dec 1933 | Box 173 \ 1 img026 | |
| Memo from a ship, proposing a test programme for Bentley carburettors to address performance issues. | 5th Jan 1934 | Box 173 \ 1 img027 | |
| And a diagram discussing S.U. carburettor piston damping and snap opening improvements. | 5th Jan 1934 | Box 173 \ 1 img028 | |
| Engine firing order and bonnet temperature. | 5th Jan 1934 | Box 173 \ 1 img029 | |
| Engine cooling, bonnet ventilation and carburetion for the Spectre model. | 5th Jan 1934 | Box 173 \ 1 img030 | |
| Campaign on 'Clero work' and remembering a single cylinder unit for investigation. | 5th Jan 1934 | Box 173 \ 1 img031 | |
| From the 'Britannic' proposing a test programme to improve snap opening on Bentley carburettors. | 5th Jan 1934 | Box 173 \ 1 img032 | |
| Engine firing order, bonnet temperature, and Spectre carburetion. | 5th Jan 1934 | Box 173 \ 1 img033 | |
| Letter discussing clutch design, flywheel periods, and failures, with comparisons to Bentley and American models. | 5th Jan 1934 | Box 173 \ 1 img034 | |
| The explosion force causing flywheel wobble. | 10th Jan 1934 | Box 173 \ 1 img035 | |
| Typed letter regarding Terraplane engine damper performance and practices at General Motors. | 10th Jan 1934 | Box 173 \ 1 img036 | |
| Cablegram from Robotham in New York to Hives in Derby regarding ethyl valve tests and design feedback. | 13th Jan 1934 | Box 173 \ 1 img037 | |
| Directory of Western Union Telegraph Company receiving offices, addresses, and telephone/telex numbers in Great Britain and Ireland. | 18th Jan 1934 | Box 173 \ 1 img038 | |
| Independent front wheel suspension, steering geometry, and various vehicle tests including axle failures. | 18th Jan 1934 | Box 173 \ 1 img039 | |
| Outlining points of reference for investigating the American trend in independent front wheel suspension design. | 12th Jan 1934 | Box 173 \ 1 img040 | |
| Potential adoption and modification of an independent front wheel springing suspension. | 17th Jan 1934 | Box 173 \ 1 img041 | |
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