| Description | Date | Identifier | |
| Responding to a query about the durability of a Wraith change gear shaft. | 23th Nov 1938 | Box 8 \ 11 11-page136 | |
| Standardisation of the Wraith Gear Box 1st Motion Shaft. | 25th Nov 1938 | Box 8 \ 11 11-page137 | |
| Notification regarding the re-issue of a temporarily strengthened 1st motion shaft for the Wraith gearbox. | 25th Nov 1938 | Box 8 \ 11 11-page138 | |
| To cancel work on gearbox and motion shaft components for the 25/30-HP chassis. | 26th Nov 1938 | Box 8 \ 11 11-page139 | |
| 'B' series replacement parts and blueprints for the 25/30-HP chassis gearbox. | 29th Nov 1938 | Box 8 \ 11 11-page140 | |
| Modification to the Constant Mesh Wheel for the 'B' Series Chassis. | 29th Nov 1938 | Box 8 \ 11 11-page141 | |
| Instructions and queries for durability testing on a Wraith Dyno gearbox. | 5th Dec 1938 | Box 8 \ 11 11-page142 | |
| The rebuild of a 25.G.VI gearbox with a new main shaft and bearings. | 6th Dec 1938 | Box 8 \ 11 11-page143 | |
| The order of replacement parts for the 25/30 HP chassis. | 6th Dec 1938 | Box 8 \ 11 11-page144 | |
| Parts list for a constant mesh wheel, propeller shaft, and driving flange, with an instruction to issue a tracing. | 6th Dec 1938 | Box 8 \ 11 11-page145 | |
| Suggested changes and test results for the Wraith 'C' Series Gear Box. | 8th Dec 1938 | Box 8 \ 11 11-page146 | |
| Dynamometer test results for the Wraith gearbox, detailing failures and endurance of shafts and bearings. | 12th Dec 1938 | Box 8 \ 11 11-page147 | |
| Gearbox component failures, with recommendations for strengthening parts and further testing of a new helix design. | 12th Dec 1938 | Box 8 \ 11 11-page148 | |
| Wraith gearbox lubrication tests and suggestions for improvement. | 12th Dec 1938 | Box 8 \ 11 11-page149 | |
| Instructions for producing oversize taper pins for gearboxes on 25/30-HP chassis. | 13th Dec 1938 | Box 8 \ 11 11-page150 | |
| Instruction to release the 3rd Motion Shaft with increased collar for the Wraith 'C' Series Gearbox. | 14th Dec 1938 | Box 8 \ 11 11-page151 | |
| List of modifications for the Wraith III gearbox to overcome faults discovered during testing. | 14th Dec 1938 | Box 8 \ 11 11-page152 | |
| Blueprints for the actuation of overdrive gears in the Wraith gearbox when fitted to a Bentley V chassis. | 14th Jan 1939 | Box 8 \ 11 11-page153 | |
| Dynamometer test report on a Wraith gearbox, detailing component failures at different running times and speeds. | 26th Jan 1939 | Box 8 \ 11 11-page154 | |
| Wraith gearbox 'chunking' issues and experiments with Schatz bearings. | 16th Feb 1939 | Box 8 \ 11 11-page155 | |
| Identifying replacement part numbers for specific bearings. | 16th Feb 1939 | Box 8 \ 11 11-page156 | |
| The rejection of Wraith gearboxes due to 'Clonking' caused by end float in ball bearings and recommending an improved bearing type. | 18th Feb 1939 | Box 8 \ 11 11-page157 | |
| Ball bearing issues, production difficulties, and mileage testing for the Wraith gearbox. | 20th Feb 1939 | Box 8 \ 11 11-page158 | |
| Use of Schatz versus Hoffman ball bearings to solve a 'clonking' issue in the Wraith gearbox. | 21th Feb 1939 | Box 8 \ 11 11-page159 | |
| Trial and procurement of gearbox bearings with reduced clearance for motion shafts. | 28th Feb 1939 | Box 8 \ 11 11-page160 | |
| Requesting an order for 30 additional sets of gearbox bearings for the Wraith model. | 7th Mar 1939 | Box 8 \ 11 11-page161 | |
| Complaints of gear change mechanism failures on the Wraith model, proposing a new torque reaction control. | 13th Apr 1939 | Box 8 \ 11 11-page162 | |
| Instruction to add notes to the drawing for the Wraith III 2nd motion shaft, GW.1884. | 28th Apr 1939 | Box 8 \ 11 11-page163 | |
| Letter from 'The Motor' magazine requesting artist facilities to draw the 'Wraith' model gearbox for a technical review. | 28th Apr 1939 | Box 8 \ 11 11-page164 | |
| Letter to 'The Motor' magazine offering facilities for an artist to draw the Wraith synchromesh gearbox. | 29th Apr 1939 | Box 8 \ 11 11-page165 | |
| Letter from 'The Motor' magazine arranging for their artist, Mr. Lord, to visit the works. | 1st May 1939 | Box 8 \ 11 11-page166 | |
| Ball race thrust tests for the Wraith Gear Box 1st Motion Shaft Bearings. | 24th May 1939 | Box 8 \ 11 11-page167 | |
| Thrust tests on a Hoffmann Ball Race No. 325 with a No. R325 as a secondary bearing under a 500 LBS static load. | 19th May 1939 | Box 8 \ 11 11-page168 | |
| Graph showing the results of thrust tests on Hoffmann ball race bearings. | 19th May 1939 | Box 8 \ 11 11-page169 | |
| Graph of thrust tests on Hoffmann ball race bearings. | 19th May 1939 | Box 8 \ 11 11-page170 | |
| Instructional memo regarding blueprints for new drawings and parts for the Wraith III Chassis piston section. | 29th Sep 1937 | Box 9 \ 1 01-page01 | |
| Request for a new drawing and part number for a Wraith compression ring. | 10th Nov 1937 | Box 9 \ 1 01-page02 | |
| Request to modify 12 EW.1536 compression rings for Wraith engines No.6 and No.7. | 25th Nov 1937 | Box 9 \ 1 01-page03 | |
| Request for six sets of 25/30 pistons for the Wraith III model to investigate a 'scuffing' trouble. | 7th Jan 1938 | Box 9 \ 1 01-page04 | |
| Changes to the design and material for Wraith piston rings due to distortion issues. | 7th Jan 1938 | Box 9 \ 1 01-page05 | |
| The unsatisfactory performance of Wraith piston rings and a directive for a revised assembly. | 12th Jan 1938 | Box 9 \ 1 01-page06 | |
| Instruction memo regarding piston materials and production for the Wraith III chassis. | 13th Jan 1938 | Box 9 \ 1 01-page07 | |
| Instructions concerning the use of standard 25/30 piston rings instead of high pressure rings for early Wraith engines. | 13th Jan 1938 | Box 9 \ 1 01-page08 | |
| Specifying the type of pistons for the first 100 sets for the Wraith model. | 17th Jan 1938 | Box 9 \ 1 01-page09 | |
| Instructions regarding new drawings for 'L' Section Compression Rings for the Wraith III Chassis piston. | 19th Jan 1938 | Box 9 \ 1 01-page10 | |
| Requesting an official order for 48 compression rings for experiments on a Wraith chassis. | 28th Jan 1938 | Box 9 \ 1 01-page11 | |
| Suspension of tool work on the Wraith III Piston, part number EW1424. | 8th Apr 1938 | Box 9 \ 1 01-page12 | |
| Technical comparison of piston scuffing in various Wraith, Bentley, and 25/30 HP engines. | 2nd Feb 1938 | Box 9 \ 1 01-page13 | |
| Investigation into piston scuffing in Wraith engines and proposed experimental solutions. | 2nd Feb 1938 | Box 9 \ 1 01-page14 | |
| Clarifying sizing and stamping conventions for Wraith pistons and cylinder blocks. | 14th Jun 1938 | Box 9 \ 1 01-page15 | |
| Potential causes and recommendations regarding 25/30 HP engine piston seizures. | 5th Jul 1938 | Box 9 \ 1 01-page16 | |
| Blueprints for Wraith pistons, detailing production, modifications, and distribution. | 22th Jul 1938 | Box 9 \ 1 01-page17 | |
| Producing a new set of six Wraith pistons with eccentric grinding, referencing blueprint EW.1883. | 22th Jul 1938 | Box 9 \ 1 01-page18 | |
| Request for a detail drawing of a modified piston for the Wraith III. | 13th Dec 1938 | Box 9 \ 1 01-page19 | |
| Modifications to the raised crown piston for the Wraith model, referencing specific drawings. | 18th Jan 1939 | Box 9 \ 1 01-page20 | |
| Use of 50 surplus sets of Wraith pistons on the 'C' series chassis. | 3rd Apr 1939 | Box 9 \ 1 01-page21 | |
| Request to fit a set of flush type Aerolite pistons into a W.III No.5 unit. | 3rd Apr 1939 | Box 9 \ 1 01-page22 | |
| Request to remove existing P.450 pistons and fit new P.446 pistons on a Wraith III No.4 Unit for a test. | 24th Apr 1939 | Box 9 \ 1 01-page23 | |
| Piston ring tests comparing pinned and non-pinned rings for unit W.111 No: 4. | 16th Mar 1940 | Box 9 \ 1 01-page24 | |
| Instruction regarding holes in the frame cross for the propeller shaft on the Wraith II model. | 13th Jul 1936 | Box 9 \ 2 02-page01 | |
| The holes in the frame cross for the propeller shaft of the Wraith II. | 13th Jul 1936 | Box 9 \ 2 02-page02 | |
| Alterations to the Wraith II propeller shaft. | 29th Aug 1936 | Box 9 \ 2 02-page03 | |
| Modifications to the Wraith II Propeller Shaft. | 22th Oct 1936 | Box 9 \ 2 02-page04 | |
| Requesting an alteration to the tube thickness for the Bentley propeller shaft. | 30th Nov 1936 | Box 9 \ 2 02-page05 | |
| Letter regarding a quotation from Hardy Spicer for a Wraith Propeller Shaft assembly and associated drawings. | 27th Jan 1937 | Box 9 \ 2 02-page06 | |
| Dimensions of the Wraith II propeller shaft to be supplied by Hardy Spicer. | 2nd Feb 1937 | Box 9 \ 2 02-page07 | |
| The design of gearbox and back axle flanges for the Wraith II propeller shaft. | 11th Feb 1937 | Box 9 \ 2 02-page08 | |
| Instruction to remove a propellor shaft damper and its fittings from one car and fit it to a Wraith car. | 6th Oct 1937 | Box 9 \ 2 02-page09 | |
| Letter to a supplier regarding an un-balance issue with propeller shafts due to lack of markings. | 10th Feb 1938 | Box 9 \ 2 02-page10 | |
| Letter from Hardy Spicer & Co., Limited confirming a telephone conversation regarding a previous letter. | 11th Feb 1938 | Box 9 \ 2 02-page11 | |
| Letter to Hardy Spicer & Co. Limited regarding alignment marks on propeller shafts. | 12th Feb 1938 | Box 9 \ 2 02-page12 | |
| Letter from a supplier confirming a change in procedure for arrow markings on future orders. | 14th Feb 1938 | Box 9 \ 2 02-page13 | |
| Correspondence with Hardy Spicer about markings on Wraith propeller shafts for correct reassembly. | 15th Feb 1938 | Box 9 \ 2 02-page14 | |
| Instructions and part list for modifying a Wraith III Propeller Shaft by fitting a Phantom 111 Sliding Joint. | 22th Apr 1938 | Box 9 \ 2 02-page15 | |
| Suspension of delivery for Wraith propeller shafts, part number GB.1673. | 5th May 1938 | Box 9 \ 2 02-page16 | |
| Experiment with a larger Hardy Spicer joint for the Wraith propellor shaft. | 9th Nov 1938 | Box 9 \ 2 02-page17 | |
| Request to hold the propeller shaft section for the Wraith 'C' Series. | 9th Nov 1938 | Box 9 \ 2 02-page18 | |
| Scheme for a Hardy Spicer propeller shaft with larger joints for the Wraith III model. | 10th Nov 1938 | Box 9 \ 2 02-page19 | |
| List detailing different configurations for Wraith sliding joints. | 14th Nov 1938 | Box 9 \ 2 02-page20 | |
| Technical memorandum detailing issues and testing of the propeller shaft for the Wraith model. | 17th Nov 1938 | Box 9 \ 2 02-page21 | |
| Testing and potential implementation of a larger '1350' type joint for experimental cars. | 17th Nov 1938 | Box 9 \ 2 02-page22 | |
| Testing and implementing a larger 1350 type joint for the Wraith propellor shaft. | 25th Nov 1938 | Box 9 \ 2 02-page23 | |
| Maintenance procedures for the Wraith propellor shaft, addressing issues like lubricant loss and needle track indentation. | 26th Nov 1938 | Box 9 \ 2 02-page24 | |
| Parts required to fit new propeller shafts with increased diameter joints to the 25/30-HP chassis. | 30th Nov 1938 | Box 9 \ 2 02-page25 | |
| List of part numbers being replaced and a note about attaching new blueprints. | 30th Nov 1938 | Box 9 \ 2 02-page26 | |
| Design modification to the Wraith propeller shaft flange piece. | 19th Dec 1938 | Box 9 \ 2 02-page27 | |
| Note concerning the 25/30 HP e Rassis gearbox with a cross-reference to another file. | 6th Dec 1938 | Box 9 \ 2 02-page28 | |
| Comparison table of specifications for Wraith, Bentley, and 20/25 HP radiators. | 19th Mar 1935 | Box 9 \ 3 03-page001 | |
| The dispatch of schemes for the Wraith II radiator. | 8th Jun 1936 | Box 9 \ 3 03-page002 | |
| Wraith II Radiator Top Tank and its fittings. | 13th Jun 1936 | Box 9 \ 3 03-page003 | |
| The radiator mounting and steering pivot for the Wraith II model. | 18th Jun 1936 | Box 9 \ 3 03-page004 | |
| Transmittal note for a Wraith II Top Water Connection part. | 25th Jun 1936 | Box 9 \ 3 03-page005 | |
| The dispatch of documents for Radiator Stays and a Flexible Petrol Pipe for the Wraith II model. | 26th Jun 1936 | Box 9 \ 3 03-page006 | |
| Proposal to use a standardised, cheaper, and simpler top water connection on the Wraith model. | 3rd Jul 1936 | Box 9 \ 3 03-page007 | |
| Proposed changes to the Wraith radiator yoke design, comparing it to the Phantom III. | 4th Aug 1936 | Box 9 \ 3 03-page008 | |
| Placeholder page for a drawing, marked with a cross. | 4th Aug 1938 | Box 9 \ 3 03-page009 | |
| Scheme for replacing diagonal bracing with tie rods behind the matrix of a PIII radiator. | 4th Aug 1938 | Box 9 \ 3 03-page010 | |
| Scheme showing the deletion of diagonal stays and a modified horizontal stay for a PIII Radiator. | 4th Aug 1936 | Box 9 \ 3 03-page011 | |
| Modifications to the Wraith II radiator, releasing work and enclosing relevant drawings. | 1st Sep 1936 | Box 9 \ 3 03-page012 | |
| List of proposed modifications to reduce the cost of the Wraith radiator. | 19th Jan 1937 | Box 9 \ 3 03-page013 | |
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