| Description | Date | Identifier | |
| List of modifications for frontal appearance, colour scheme, and scuttle rigidity for a car. | 27th Jun 1939 | Box 111 \ 4 scan0159 | |
| Request to manufacture two stiffening plates for bonnet fasteners on an aluminium bonnet, referencing a modified drawing. | 27th Jun 1939 | Box 111 \ 4 scan0160 | |
| Confidential letter to Park Ward & Co. Ltd. concerning the fitting of Lucas wind-tone horns. | 8th Jul 1939 | Box 111 \ 4 scan0161 | |
| The fitting of Wind Tone Lucas Horns for the Cresta 4.B.50 model, detailing parts supplied by Park Ward & Co. | 8th Jul 1939 | Box 111 \ 4 scan0162 | |
| Correspondence with coachbuilder Park Ward & Co. Ltd. regarding the fog and spot lamp arrangement on chassis 4.B.50 'Cresta'. | 22th Jul 1939 | Box 111 \ 4 scan0163 | |
| Request to send parts for Chassis 4.B.50 - Cresta, to Messrs. Park Ward. | 28th Jul 1939 | Box 111 \ 4 scan0164 | |
| Letter to Park Ward & Co. Ltd. regarding modifications for chassis 4.B.50 'CRESTA'. | 31th Jul 1939 | Box 111 \ 4 scan0165 | |
| Upcoming specifications and modifications for three experimental cars. | 5th Aug 1939 | Box 111 \ 4 scan0166 | |
| Sending parts and arranging alterations for chassis 4.B.50 'CRESTA'. | 8th Aug 1939 | Box 111 \ 4 scan0167 | |
| Provisional delivery date for the Cresta and arranging collection with Messrs. Park Ward & Co. | 18th Aug 1939 | Box 111 \ 4 scan0168 | |
| Request to fit a twin exhaust system to a car, similar to one fitted on another vehicle. | 31th Aug 1939 | Box 111 \ 4 scan0169 | |
| Letter to Park Ward & Co. Ltd. regarding the return of double filament head lamp reflectors for vehicle 4.B.50. | 25th Sep 1939 | Box 111 \ 4 scan0170 | |
| Difficulties encountered during the conversion of a motor car, detailing issues with the gearbox, exhaust, and steering systems. | 26th Oct 1939 | Box 111 \ 4 scan0171 | |
| Modifications and fitting issues with brakes, servo, shock absorbers, and radiator. | 26th Oct 1939 | Box 111 \ 4 scan0172 | |
| Radiator fittings and bonnet side strips. | 26th Oct 1939 | Box 111 \ 4 scan0173 | |
| Blueprint for brackets and silent blocks to support a radiator frame. | 1st Nov 1939 | Box 111 \ 4 scan0174 | |
| Letter to a coachbuilder requesting additional switches for an instrument board and luggage boot. | 1st Nov 1939 | Box 111 \ 4 scan0175 | |
| Letter to Park Ward & Co. Ltd. about a body mounted too low on chassis 4.B.50, causing clearance issues, and discusses two alternative solutions. | 3rd Nov 1939 | Box 111 \ 4 scan0176 | |
| Letter from coachbuilder Park, Ward & Co. Ltd. regarding body mounting alterations on a chassis. | 9th Nov 1939 | Box 111 \ 4 scan0177 | |
| Letter to C.W. Ward of Park Ward & Co. Ltd. regarding the body on the 'Cresta'. | 10th Nov 1939 | Box 111 \ 4 scan0178 | |
| The observed faults during a preliminary car run. | 27th Nov 1939 | Box 111 \ 4 scan0179 | |
| Design changes for the bonnet, instrument board, front wings, and engine mounting. | 27th Nov 1939 | Box 111 \ 4 scan0180 | |
| Instruction to fit a Wraith steering wheel to a car, replacing the existing Bentley V wheel. | 5th Dec 1939 | Box 111 \ 4 scan0181 | |
| Road test report noting chassis and bodywork faults on car 4.B.50. | 11th Dec 1939 | Box 111 \ 4 scan0182 | |
| Work order detailing five specific modifications and fittings for car 4.B.50. | 12th Jan 1940 | Box 111 \ 4 scan0183 | |
| Notice about preventing bent distributor shafts during rotor removal. | 13th Jan 1940 | Box 111 \ 4 scan0184 | |
| Requesting a Bentley car for Easter. | 8th Mar 1940 | Box 111 \ 4 scan0185 | |
| Brief typed memo confirming the availability of 'the Cresta'. | 11th Mar 1940 | Box 111 \ 4 scan0186 | |
| Requesting that the 'Cresta' vehicle be made ready for Easter. | 11th Mar 1940 | Box 111 \ 4 scan0187 | |
| Request to fit a new key to the brake cross shaft as detailed in an accompanying sketch. | 15th Mar 1940 | Box 111 \ 4 scan0188 | |
| The adjustment of a car's speedometer to read intentionally fast, without affecting the odometer. | 16th Mar 1940 | Box 111 \ 4 scan0189 | |
| Speedometer error testing results for vehicle 4-B-50. | 16th Mar 1940 | Box 111 \ 4 scan0190 | |
| Request to manufacture one brake lever and three brake rods to remove servo judders. | 19th Mar 1940 | Box 111 \ 4 scan0191 | |
| Confidential internal memo providing a road test review of the Cresta car, with commentary on its performance and features. | 3rd Apr 1940 | Box 111 \ 4 scan0192 | |
| Cover note forwarding a copy of Sg's comments on document 4.B.50. | 3rd Apr 1940 | Box 111 \ 4 scan0193 | |
| Providing feedback on the performance and features of the Cresta car after a test drive. | 4th Aug 1950 | Box 111 \ 4 scan0194 | |
| Replacement of an inconsistent damper with a Studebaker type for car 4B50. | 5th Apr 1940 | Box 111 \ 4 scan0195 | |
| Chromium plating and modification of brake expander units. | 10th Apr 1940 | Box 111 \ 4 scan0196 | |
| Requesting the removal, load and crack testing of a lower triangle, and the swapping of parts between two different vehicles. | 8th Apr 1940 | Box 111 \ 4 scan0197 | |
| Investigation confirming a hot rear seat on the 4.B.50 model due to the exhaust system, requiring a heat shield. | 15th Apr 1940 | Box 111 \ 4 scan0198 | |
| Complaint about an overheating near-side rear seat and requesting the fabrication of an asbestos and aluminium heat shield. | 15th Apr 1940 | Box 111 \ 4 scan0199 | |
| Instructions for modifications to the exhaust, engine damper, and suspension. | 15th Apr 1940 | Box 111 \ 4 scan0200 | |
| Complaint of excessive heat in the rear seating area from the exhaust and instructing a heat shield to be fitted. | 18th Apr 1940 | Box 111 \ 4 scan0201 | |
| Tool kit location and arrangement for the 4.B.50 model. | 18th Apr 1940 | Box 111 \ 4 scan0202 | |
| The revised frontal appearance for the Cresta 4.B.50, involving small Lucas headlamps. | 22th Apr 1940 | Box 111 \ 4 scan0203 | |
| List of six required modifications and checks to be carried out on car 4.B.50. | 10th May 1940 | Box 111 \ 4 scan0204 | |
| The trial of a single-point radiator mounting and potential modifications to the radiator yoke. | 16th May 1940 | Box 111 \ 4 scan0205 | |
| Several faults and observations on car 4.B.50. | 9th Sep 1940 | Box 111 \ 4 scan0206 | |
| Clarifying that vehicle 4.B.50 was fitted with engine B.80. No 1, referencing a previous memo about sparking plugs. | 12th Sep 1940 | Box 111 \ 4 scan0207 | |
| Explaining the cause of poor running and stalling in car 4.B.50 and confirming the issue is now resolved. | 26th Feb 1941 | Box 111 \ 4 scan0208 | |
| Responding to a complaint about poor slow running for car 4.B.50. | 26th Feb 1941 | Box 111 \ 4 scan0209 | |
| Faults found in a loan car, detailing a door opening at high speed, a leaking roof, and various running issues. | 31th Jan 1941 | Box 111 \ 4 scan0210 | |
| Clarifying that a vehicle failure was due to axle trouble, not the gearbox. | 23th Apr 1941 | Box 111 \ 4 scan0211 | |
| Specification revision for Bentley 80 Unit No.1, chassis 4-B-50, detailing a component change. | 20th May 1941 | Box 111 \ 4 scan0212 | |
| Specification revision for Bentley Chassis 4-B-50, detailing changes to the rear axle. | 20th May 1941 | Box 111 \ 4 scan0213 | |
| Repairing a car's front wing after an accident and suggesting a modification to a more conventional design. | 25th May 1941 | Box 111 \ 4 scan0214 | |
| Proposals for deleting the built-in headlamps on chassis 4.B.50 and modifying the front wings. | 28th May 1941 | Box 111 \ 4 scan0215 | |
| Letter to Messrs. Park Ward requesting the repair and modification of a damaged experimental chassis, 4.B.50. | 29th May 1941 | Box 111 \ 4 scan0216 | |
| Test run to Bath and back, detailing issues with a vehicle. | 28th Aug 1941 | Box 111 \ 4 scan0217 | |
| List of petrol and oil used in vehicle 4-B-50 from 9th March to 26th May. | 29th Aug 1941 | Box 111 \ 4 scan0218 | |
| Removal of gearbox 7.BV from Bentley Chassis 4.B.50 and its refitting to another unit. | 23th May 1942 | Box 111 \ 4 scan0219 | |
| Blueprint of a Four Door Saloon for the 4.B.50. Bentley 'Cresta'. | 20th Mar 1939 | Box 111 \ 4 scan0220 | |
| PD.114 induction pipe for a single carburetter with hot spot and air silencer for the Bentley 50. | 23th Feb 1938 | Box 112 \ 1 scan0001 | |
| The comparison of various carburettor schemes for the B.50 induction system. | 24th Feb 1938 | Box 112 \ 1 scan0002 | |
| Comparative tests of four different induction systems for the Bentley III and Bentley 50 models. | 10th May 1938 | Box 112 \ 1 scan0003 | |
| Comparison of Stromberg and S.U. carburetter performance, focusing on part throttle correction and pulsation effects. | 10th May 1938 | Box 112 \ 1 scan0004 | |
| Analysis of part throttle correction and power variations related to the balance hole size in the induction pipe. | 10th May 1938 | Box 112 \ 1 scan0005 | |
| Power and BMEP performance graph for a 4 1/4 Litre Bentley engine, comparing two induction systems. | 10th May 1938 | Box 112 \ 1 scan0006 | |
| Graph comparing part throttle fuel economy of different induction systems for a 4 1/4 Litre Bentley. | 1st Sep 1940 | Box 112 \ 1 scan0007 | |
| Power and B.M.E.P. curves for a 4 1/4 Litre Bentley engine with varying induction system restrictions. | 1st Sep 1940 | Box 112 \ 1 scan0008 | |
| Graph of part throttle fuel economy for a 4 1/4 Litre Bentley engine. | 1st Sep 1940 | Box 112 \ 1 scan0009 | |
| Power curve graph for a 4 1/4 Litre Bentley engine comparing two different induction system configurations. | 1st Sep 1940 | Box 112 \ 1 scan0010 | |
| Graph comparing part throttle fuel economy for a 4¼ Litre Bentley engine with two different carburettor systems. | 1st Sep 1940 | Box 112 \ 1 scan0011 | |
| Graph comparing part throttle fuel economy against engine RPM for two different induction systems on a 4 1/4 Litre Bentley. | 15th Jun 1938 | Box 112 \ 1 scan0012 | |
| Blueprints for various inlet and induction pipes for the Bentley 50 chassis. | 15th Jun 1938 | Box 112 \ 1 scan0013 | |
| Essential floatchamber modifications for the Bentley III & B.50 chassis. | 18th Aug 1938 | Box 112 \ 1 scan0014 | |
| Estimated costs memorandum for the Bentley 50, detailing the flywheel, clutch, and pedal assembly. | 6th Dec 1937 | Box 112 \ 1 scan0015 | |
| The clutch suitability for the Bentley III & 50 chassis, recommending a 10-inch clutch over an 11-inch one. | 5th Aug 1938 | Box 112 \ 1 scan0016 | |
| The decision not to use an 11' clutch on Bentley units, favouring the 10' version. | 26th Oct 1938 | Box 112 \ 1 scan0017 | |
| Requesting an alteration to the List of Parts for models B.111 and B.50 to specify a 10 inch clutch. | 2nd Nov 1938 | Box 112 \ 1 scan0018 | |
| Premature failure of a clutch on a Bentley lorry due to suspected engine and gearbox misalignment. | 7th Nov 1941 | Box 112 \ 1 scan0019 | |
| Letter to The Light Production Co. regarding piston pricing and performance comparisons. | 2nd Dec 1937 | Box 112 \ 1 scan0020 | |
| Letter from The Light Production Co. Ltd. arranging a meeting with W. A. Robotham for the 15th of the month. | 8th Dec 1937 | Box 112 \ 1 scan0021 | |
| Letter to C.H. Brooks, Esq., of Light Production Co., Ltd., confirming a meeting. | 9th Dec 1937 | Box 112 \ 1 scan0022 | |
| The pricing and sourcing of B.50 pistons, comparing options from Light Production with internal manufacturing. | 22th Dec 1937 | Box 112 \ 1 scan0023 | |
| The implementation of 1350 type joints for propeller shafts on B.V and B.50 models. | 22th Dec 1938 | Box 112 \ 1 scan0024 | |
| Proposal letter from a Dutch radiator manufacturer for a new water cooling filter for motorcars. | 16th Aug 1937 | Box 112 \ 1 scan0025 | |
| Blueprint showing a front view and a vertical cross-section of a mechanical component, with labels in Dutch. | 16th Aug 1937 | Box 112 \ 1 scan0026 | |
| Advertisement brochure for the 'Bloksma & Zonen' cooling water filter, with installation instructions. | 16th Aug 1937 | Box 112 \ 1 scan0027 | |
| Dutch language promotional leaflet for the 'Bloksma & Zonen' coolant filter. | 7th Dec 1937 | Box 112 \ 1 scan0028 | |
| Internal request to produce trial undersheets for Wraith and B.III chassis using steel instead of aluminium. | 7th Dec 1937 | Box 112 \ 1 scan0029 | |
| Outlining cost-reduction modifications for the B.50 radiator. | 5th Jan 1938 | Box 112 \ 1 scan0030 | |
| Cost reduction and design of the Bentley SO radiator. | 18th Feb 1938 | Box 112 \ 1 scan0031 | |
| Discussion on cost reduction proposals for the Bentley 50 radiator design. | 18th Feb 1938 | Box 112 \ 1 scan0032 | |
| Design of the radiator for the Bentley 50, including its internals, grille, and shell. | 25th Mar 1938 | Box 112 \ 1 scan0033 | |
| Letter to Park Ward & Co. Ltd. about making a wooden model of a radiator and a car mock-up for a Long Wheelbase Bentley. | 25th Mar 1938 | Box 112 \ 1 scan0034 | |
| Letter discussing modifications to the bonnet and radiator shell for a Bentley mock-up, referencing specific drawings and parts. | 25th Mar 1938 | Box 112 \ 1 scan0035 | |
| Letter from the Car Project Office about a modified frame shape, mentioning that prints are being sent separately. | 28th Mar 1938 | Box 112 \ 1 scan0036 | |
| Prints of drawing PD.131 for the Bentley 50 radiator and shell, to be manufactured at Marstons. | 28th Mar 1938 | Box 112 \ 1 scan0037 | |
| Production process for the Bentley 50 radiator, shell, and grill. | 29th Mar 1938 | Box 112 \ 1 scan0038 | |
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