| Description | Date | Identifier | |
| Cost savings from deleting tipping shoes on Wraith rear brakes. | 4th Apr 1938 | Box 7 \ 7 X 606 Brakes-page117 | |
| Dispatching blueprints for four-shoe front wheel brakes on a Wraith III for costing. | 6th Apr 1938 | Box 7 \ 7 X 606 Brakes-page118 | |
| Suggestion to trial a rubber stop on the Wraith III hand brake lever to eliminate noise. | 21th Apr 1938 | Box 7 \ 7 X 606 Brakes-page119 | |
| Change from cast steel to forged steel brake shoes for the Wraith model due to production issues. | 22th Apr 1938 | Box 7 \ 7 X 606 Brakes-page120 | |
| Investigation into the manufacturing costs of brake carrier plates for the Wraith chassis. | 27th Apr 1938 | Box 7 \ 7 X 606 Brakes-page121 | |
| Parts information for Bentley II, Phantom III, and Wraith models. | 4th May 1938 | Box 7 \ 7 X 606 Brakes-page122 | |
| Blueprints for Wraith III chassis rear brakes, detailing the change to Rolled Section Steel Shoes. | 10th May 1938 | Box 7 \ 7 X 606 Brakes-page123 | |
| Changing Wraith brake drums from aluminium to iron and upgrading specific chassis. | 27th May 1938 | Box 7 \ 7 X 606 Brakes-page124 | |
| Machining issue with steel brake shoes for the Wraith III and a proposed solution. | 27th Mar 1938 | Box 7 \ 7 X 606 Brakes-page125 | |
| Fitting a Gordon Armstrong damper to the Wraith front brakes as an anti-thump device. | 18th Jun 1938 | Box 7 \ 7 X 606 Brakes-page126 | |
| Cover note for a modified blueprint of the Brake Leverages diagram for a Wraith III. | 22th Jun 1938 | Box 7 \ 7 X 606 Brakes-page127 | |
| Request to fit BZ brake linings to the rear brakes in place of the MRJ linings, which are being sourced from Ferodo. | 17th Aug 1938 | Box 7 \ 7 X 606 Brakes-page128 | |
| Failures and potential solutions for the Wraith's front brakes due to overheating. | 26th Aug 1938 | Box 7 \ 7 X 606 Brakes-page129 | |
| Fitting of a damper (SCD.805) to the brakes of three Wraith cars. | 12th Sep 1938 | Box 7 \ 7 X 606 Brakes-page130 | |
| Letter from The Morgan Crucible Company regarding the despatch of two dozen plugs. | 19th Sep 1938 | Box 7 \ 7 X 606 Brakes-page131 | |
| Querying a discrepancy between written instructions and photostats for Wraith brake adjustments. | 12th Oct 1938 | Box 7 \ 7 X 606 Brakes-page132 | |
| Request to issue an official order for 4 dozen graphite conical plugs. | 12th Oct 1938 | Box 7 \ 7 X 606 Brakes-page133 | |
| Clarifying the location of rods R.7 and R.8 on the Wraith Brakes prints. | 15th Oct 1938 | Box 7 \ 7 X 606 Brakes-page134 | |
| Proposal for an air damper for the Wraith brake pedal to prevent knocking upon release. | 18th Oct 1938 | Box 7 \ 7 X 606 Brakes-page135 | |
| Letter to The Morgan Crucible Co. Ltd. regarding an order and quote for conical graphite plugs. | 18th Oct 1938 | Box 7 \ 7 X 606 Brakes-page136 | |
| Modifications for fitting a front brake damper onto the engine sump for the Wraith III model. | 22th Nov 1938 | Box 7 \ 7 X 606 Brakes-page137 | |
| List of parts and blueprints required for the Wraith model's pedals and dashboard fittings. | 31th Oct 1938 | Box 7 \ 7 X 606 Brakes-page138 | |
| Issues with the locating bolts for the Wraith rear brakes and suggesting replacements. | 7th Dec 1938 | Box 7 \ 7 X 606 Brakes-page139 | |
| Fouling issue on the Wraith brakes, suggesting a modification to make the assembly fool-proof. | 17th Mar 1939 | Box 7 \ 7 X 606 Brakes-page140 | |
| Issuing a standardisation sheet for a Thermoid-Ferodo brake lining combination on the Wraith model to prevent squeaks. | 4th Jul 1939 | Box 7 \ 7 X 606 Brakes-page141 | |
| Brake squeak complaints on Wraith cars, testing different brake linings and recommending a new standard combination. | 5th Jul 1939 | Box 7 \ 7 X 606 Brakes-page142 | |
| The front brake pull rod fouling the spring casing on Wraith chassis. | 30th Aug 1939 | Box 7 \ 7 X 606 Brakes-page143 | |
| Clearance of the front brake pull rod on the Wraith chassis. | 1st Aug 1939 | Box 7 \ 7 X 606 Brakes-page144 | |
| Cam details in document LeC 4259, noting a modification to the follower radius. | 17th Dec 1934 | Box 7 \ 8 X 607 Camshaft-page01 | |
| Proposal to change the material of the tappet guides for the Wraith III camshaft balancer to reduce cost. | 24th Mar 1937 | Box 7 \ 8 X 607 Camshaft-page02 | |
| Necessity and cost-saving potential of deleting the camshaft balancer on the Wraith III engine. | 25th Mar 1937 | Box 7 \ 8 X 607 Camshaft-page03 | |
| Performance test figures for Wraith Cars 24.G.VI and 25.G.VI, including acceleration and hill climb times. | 17th Jun 1937 | Box 7 \ 8 X 607 Camshaft-page04 | |
| Experiment with a higher toe lift cam form with a reduced diameter base circle for the Wraith III engine. | 25th Jun 1937 | Box 7 \ 8 X 607 Camshaft-page05 | |
| Cam form modification with a reduced diameter base circle for the Wraith III engine. | 25th Jun 1937 | Box 7 \ 8 X 607 Camshaft-page06 | |
| The required reduction in push rod length due to using Vauxhall cams on a Wraith III camshaft. | 26th Jun 1937 | Box 7 \ 8 X 607 Camshaft-page07 | |
| Camshaft with Vauxhall cams for the Wraith III engine. | 26th Jun 1937 | Box 7 \ 8 X 607 Camshaft-page08 | |
| Camshaft with Vauxhall cams for the Wraith III, requiring a reduction in push rod length. | 26th Jun 1937 | Box 7 \ 8 X 607 Camshaft-page09 | |
| Instructions regarding new drawings and blueprints for the Wraith III Chassis Camshaft, section 5090. | 24th Sep 1937 | Box 7 \ 8 X 607 Camshaft-page10 | |
| New spring-loaded thrust plunger for the camshaft on Wraith III and Bentley III models. | 21th Jan 1938 | Box 7 \ 8 X 607 Camshaft-page11 | |
| Confirming a verbal request regarding Wraith camshafts and the inclusion of an internal screw. | 14th Feb 1938 | Box 7 \ 8 X 607 Camshaft-page12 | |
| Machining and modification of three Wraith III camshafts cast in 'Monikrom'. | 15th Feb 1938 | Box 7 \ 8 X 607 Camshaft-page13 | |
| Design modifications for the camshaft driving gear for the Wraith III and Bentley III, specifically a version without the cam balancer. | 17th Feb 1938 | Box 7 \ 8 X 607 Camshaft-page14 | |
| Blueprints for a Wraith III camshaft, an adapter, and a taper pin. | 17th Feb 1938 | Box 7 \ 8 X 607 Camshaft-page15 | |
| Calculations for the Wraith III camshaft balancer, detailing torque values at different speeds. | 1st Apr 1938 | Box 7 \ 8 X 607 Camshaft-page16 | |
| Calculations of torque on the camshaft for a Wraith III engine, with and without a balancer. | 8th Apr 1938 | Box 7 \ 8 X 607 Camshaft-page17 | |
| Ineffectiveness of the Wraith cam balancer and related timing gear wear. | 13th Apr 1938 | Box 7 \ 8 X 607 Camshaft-page18 | |
| Recommendations on fitting a cam balancer to the first 100 Wraith cars, addressing gear rattles and crankshaft oscillations. | 13th Apr 1930 | Box 7 \ 8 X 607 Camshaft-page19 | |
| Correcting a material specification (S/LXX) and Brinell hardness for Wraith camshaft gears. | 26th Apr 1938 | Box 7 \ 8 X 607 Camshaft-page20 | |
| Decision to use uncarburised soft steel for Wraith camshaft gears based on wear testing. | 26th Apr 1938 | Box 7 \ 8 X 607 Camshaft-page21 | |
| History and necessity of the camshaft balancer for the Wraith model, referencing issues with the 20/25 HP engine. | 27th Apr 1938 | Box 7 \ 8 X 607 Camshaft-page22 | |
| Adoption of a slipper drive to eliminate engine gear rattle and reduce costs on the Wraith engine. | 27th Apr 1938 | Box 7 \ 8 X 607 Camshaft-page23 | |
| Copy of a previous communication regarding a Wraith Camshaft Balancer. | 28th Apr 1938 | Box 7 \ 8 X 607 Camshaft-page24 | |
| Covering memo regarding the Wraith Camshaft Balancer, attaching a copy of a previous document. | 29th Apr 1938 | Box 7 \ 8 X 607 Camshaft-page25 | |
| Ineffectiveness of the Wraith cam balancer in relation to timing gear wear and low-speed rattle. | 13th Apr 1938 | Box 7 \ 8 X 607 Camshaft-page26 | |
| Recommendations on whether to fit a cam balancer to the first 100 Wraith cars, discussing potential wear at high revs. | 13th Apr 1938 | Box 7 \ 8 X 607 Camshaft-page27 | |
| The wear of Wraith timing gears. | 11th Apr 1938 | Box 7 \ 8 X 607 Camshaft-page28 | |
| Investigation into sheared distributor driving pins and gear wear in the timing gear drive, comparing different materials. | 11th Apr 1938 | Box 7 \ 8 X 607 Camshaft-page29 | |
| Test report logging running time, mileage, and backlash measurements for nine different component units. | 12th Apr 1938 | Box 7 \ 8 X 607 Camshaft-page30 | |
| Investigation report on the timing gears of the Wraith III, focusing on camwheel wear and rattle. | 12th Apr 1938 | Box 7 \ 8 X 607 Camshaft-page31 | |
| List of tests to investigate crank oscillations, camwheel wear, and rattles on Wraith III and Bentley II models. | 12th Apr 1938 | Box 7 \ 8 X 607 Camshaft-page32 | |
| Graph showing the camshaft torque for the Wraith III engine at 4500 RPM. | 16th Jun 1938 | Box 7 \ 8 X 607 Camshaft-page33 | |
| Request to manufacture an indicator drive for a Bentley II camshaft, referencing a previous one made for a Wraith III camshaft. | 16th Jun 1938 | Box 7 \ 8 X 607 Camshaft-page34 | |
| Modifications to tappets and push rods for the Wraith III and Bentley III engines. | 13th Jul 1938 | Box 7 \ 8 X 607 Camshaft-page35 | |
| Balancing of the cam driving wheel for the Wraith III and Bentley III models. | 10th Sep 1938 | Box 7 \ 8 X 607 Camshaft-page36 | |
| Instruction to add two 1.000' diameter holes to the camshaft wheel for the Wraith III and Bentley III to allow for bearing adjustment. | 8th Sep 1938 | Box 7 \ 8 X 607 Camshaft-page37 | |
| Requesting the trial fitting of a non-chamfered camwheel on a Wraith B.III unit and other new units. | 30th Sep 1938 | Box 7 \ 8 X 607 Camshaft-page38 | |
| Graph comparing the Brake Mean Effective Pressure and performance curves of various engines from Cadillac, La Salle, Bentley, and Rolls-Royce. | 4th Jan 1936 | Box 8 \ 1 01-page01 | |
| Secret memorandum detailing six different features of the Wraith Clutch compared to the Spectre clutch. | 4th Jan 1936 | Box 8 \ 1 01-page02 | |
| Technical note discussing the clutch withdrawal bearing and flywheel design. | 4th Jan 1935 | Box 8 \ 1 01-page03 | |
| Cost reduction suggestions for the Wraith Clutch universal ring. | 14th Jan 1935 | Box 8 \ 1 01-page04 | |
| Material selection (Magnesium vs Aluminium) for the Wraith clutch casing. | 15th Jan 1936 | Box 8 \ 1 01-page05 | |
| Modifications and assembly points for the Wraith clutch coupling shaft. | 25th Jan 1935 | Box 8 \ 1 01-page06 | |
| Secret memo with schemes showing how to dismantle the Wraith clutch and clutch casing. | 6th Feb 1935 | Box 8 \ 1 01-page07 | |
| Introduction of a ventilated Borg & Beck clutch for the Wraith model. | 10th Jul 1936 | Box 8 \ 1 01-page08 | |
| Design of the Wraith II clutch casing, comparing it to the 25/30 model. | 13th Jul 1936 | Box 8 \ 1 01-page09 | |
| Design of the clutch casing for the Wraith II model. | 13th Jul 1936 | Box 8 \ 1 01-page10 | |
| Modification to the Wraith II pedal gap plate to incorporate a universal gas-tight joint. | 15th Jul 1936 | Box 8 \ 1 01-page11 | |
| Modifications to the Wraith II clutch casing to allow for gearbox assembly clearance. | 17th Sep 1936 | Box 8 \ 1 01-page12 | |
| Design differences of the Wraith II flywheel compared to the standard 25/30 HP flywheel. | 22th Jun 1936 | Box 8 \ 1 01-page13 | |
| Modification to the Wraith II clutch connecting link. | 1st Sep 1936 | Box 8 \ 1 01-page14 | |
| Proposed ventilated clutch and casing for the Wraith II. | 1st Sep 1936 | Box 8 \ 1 01-page15 | |
| Justification for a modified Wraith flywheel, concluding the existing arrangement should be adhered to. | 3rd Sep 1936 | Box 8 \ 1 01-page16 | |
| Poor performance and replacement rates of flywheel gear rings on various car models. | 15th Sep 1936 | Box 8 \ 1 01-page17 | |
| Costs for replacing flywheel and starter motor rings for the Phantom II model. | 21th Oct 1936 | Box 8 \ 1 01-page18 | |
| The cost, procedure, and failure rates for the 20-25 HP Solid Flywheel and Starter Ring. | 2nd Dec 1936 | Box 8 \ 1 01-page19 | |
| Quantities, designs, and reasons for failure of fly-wheel gear rings. | 2nd Dec 1936 | Box 8 \ 1 01-page20 | |
| Flywheel and gear ring replacement, balancing, and associated costs for different car models. | 2nd Dec 1936 | Box 8 \ 1 01-page21 | |
| Damaged flywheel gear rings, comparing figures, and attributing potential causes for the failures. | 2nd Dec 1936 | Box 8 \ 1 01-page22 | |
| Continued discussion on the pros and cons of replacing a loose gear ring versus a complete flywheel. | 2nd Dec 1936 | Box 8 \ 1 01-page23 | |
| Flywheel changes and starter motor troubles for 25 HP and Bentley models. | 3rd Dec 1936 | Box 8 \ 1 01-page24 | |
| Requesting information to decide between two alternative flywheel and clutch designs. | 7th Dec 1936 | Box 8 \ 1 01-page25 | |
| Cost estimate and comparison for a Wraith Flywheel and Clutch scheme. | 10th Dec 1936 | Box 8 \ 1 01-page26 | |
| Cost comparison for repairing flywheel gear rings versus changing the entire flywheel, considering design implications. | 12th Dec 1936 | Box 8 \ 1 01-page27 | |
| Cost comparison for repairing damaged flywheel gear rings, considering design alterations. | 12th Dec 1936 | Box 8 \ 1 01-page28 | |
| Costs and benefits of a separate starter gear ring for the Wraith Flywheel. | 15th Dec 1936 | Box 8 \ 1 01-page29 | |
| Proposal to modify the flywheel to a solid S/RC type for the Phantom III car. | 7th Jan 1937 | Box 8 \ 1 01-page30 | |
| Urgent internal order request for a specific type of clutch from Borg & Beck for a Wraith model. | 7th Jan 1937 | Box 8 \ 1 01-page31 | |
| Wraith II clutch, referencing schedules for the disc. | 19th Jan 1937 | Box 8 \ 1 01-page32 | |
| The Wraith II Clutch, detailing the starter ring being made solid with the flywheel from high carbon steel. | 11th Feb 1937 | Box 8 \ 1 01-page33 | |
| To cease ordering flywheels with separate starter rings for the Wraith model due to cost. | 15th Feb 1937 | Box 8 \ 1 01-page34 | |
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