| Description | Date | Identifier | |
| List of cost reduction suggestions for the Wraith Clutch, including material changes and machining modifications. | 25th Feb 1937 | Box 8 \ 1 01-page35 | |
| Clearance issue with the Wraith II Clutch due to thermal expansion. | 1st Mar 1937 | Box 8 \ 1 01-page36 | |
| Modifications to the Wraith III clutch inspection cover. | 4th Mar 1937 | Box 8 \ 1 01-page37 | |
| Request to fit a 10' centre Borg & Beck clutch in place of the present 11' one for car 24.G.VI. | 28th Apr 1937 | Box 8 \ 1 01-page38 | |
| Wraith III slipper flywheel design, proposing blind holes instead of screwed caps for spring access. | 29th Apr 1937 | Box 8 \ 1 01-page39 | |
| Responding to a suggestion regarding the Wraith III Slipper Flywheel. | 30th Apr 1937 | Box 8 \ 1 01-page40 | |
| Secret memo discussing a design modification for the Wraith III slipper flywheel. | 3rd May 1937 | Box 8 \ 1 01-page41 | |
| Instruction to replace the clutch lining on a Wraith 25-G-VI with an experimental Ferodo lining. | 17th Jun 1937 | Box 8 \ 1 01-page42 | |
| Communication regarding the implementation of lower rated slipper flywheel springs for the Wraith III model. | 3rd Jul 1937 | Box 8 \ 1 01-page43 | |
| Request for an extra flywheel ring and bolts for a Wraith. | 6th Jul 1937 | Box 8 \ 1 01-page44 | |
| Request to dismantle a car for clutch examination due to it slipping badly. | 29th Sep 1937 | Box 8 \ 1 01-page45 | |
| Instruction memo to test clutch spring poundage and fit a new standard Borg and Beck driven clutch plate. | 30th Sep 1937 | Box 8 \ 1 01-page46 | |
| Instruction to fit a new clutch to Wraith III Unit No.2 due to wear from being run at critical speeds on the test bed. | 5th Nov 1937 | Box 8 \ 1 01-page47 | |
| The clutch assemblies for the Wraith III and Bentley III models. | 11th Nov 1937 | Box 8 \ 1 01-page48 | |
| Request to fit an 11' Thermoid faced clutch plate and to test the poundage of thrust springs. | 18th Nov 1937 | Box 8 \ 1 01-page49 | |
| Instruction to replace a 'Rabestos' faced clutch plate with a 10' 'Thermoid' faced one. | 12th Jan 1938 | Box 8 \ 1 01-page50 | |
| Sending Wraith car 24.G.VI to the fitting shop to have an inertia ring fitted to the flywheel. | 7th Feb 1938 | Box 8 \ 1 01-page51 | |
| Order for rubber tubing for a Wraith clutch pedal stop, part number 52404. | 11th Feb 1938 | Box 8 \ 1 01-page52 | |
| Request to prepare a set of parts for a Semi Flexible Flywheel Wraith. | 1st Mar 1938 | Box 8 \ 1 01-page53 | |
| Instructions for preparing a sheet brass ring and mounting a clutch on a flywheel for testing flutter. | 11th Mar 1938 | Box 8 \ 1 01-page54 | |
| Wraith car (28.G.VI) being sent for clutch examination after a third failure. | 21th Mar 1938 | Box 8 \ 1 01-page55 | |
| Comparison of inertia values in lbs.ins. for various flywheel and clutch configurations. | 22th Apr 1938 | Box 8 \ 1 01-page56 | |
| Instruction to machine the inertia ring on a Wraith flexible flywheel for easier crankcase assembly. | 3rd May 1938 | Box 8 \ 1 01-page57 | |
| Requesting the preparation of a modified flexible flywheel for a Wraith or Bentley. | 3rd Jun 1938 | Box 8 \ 1 01-page58 | |
| Request to release the flywheel and clutch section for the Wraith 'B' Series to be the same as the 'A' series. | 4th Jul 1938 | Box 8 \ 1 01-page59 | |
| Request for a copy of notes on the Wraith clutch operation concerning experimental parts fitted to production cars. | 3rd Aug 1938 | Box 8 \ 1 01-page60 | |
| Modification instruction for the Wraith clutch operation to increase clearance on the first 24 cars. | 3rd Aug 1938 | Box 8 \ 1 01-page61 | |
| Technical note regarding the clutch operating lever for the 25/30 HP 'A' series chassis, 1 to 24. | 12th Sep 1938 | Box 8 \ 1 01-page62 | |
| Deflection test procedure for flexible flywheels RM.498 and RM.533 for Wraith and Bentley models. | 12th Aug 1938 | Box 8 \ 1 01-page63 | |
| Request to dismantle a clutch, fit a new centre plate, and standardize the crankcase oil breather pipe due to a jaggering issue. | 30th Aug 1938 | Box 8 \ 1 01-page64 | |
| Instructions for preparing a flexible flywheel for chassis unit W.III.8 25.G.VI. | 11th Oct 1938 | Box 8 \ 1 01-page65 | |
| Instruction to fit a new 11' clutch plate with Ferodo S.77/2 facings to Unit W.III & Chassis 25.G.VI. | 14th Oct 1938 | Box 8 \ 1 01-page66 | |
| Instructions for conducting flywheel flutter tests on a Wraith engine. | 28th Oct 1938 | Box 8 \ 1 01-page67 | |
| Request to make and fit an additional brass ring to a car's clutch for flywheel flutter tests. | 3rd Nov 1938 | Box 8 \ 1 01-page68 | |
| Modifications to the clutch for fitting a B.60 engine unit into a Wraith chassis. | 25th May 1953 | Box 8 \ 1 01-page69 | |
| Request to fit a new 11' Thermoid faced clutch plate to Chassis 24.O.VI. | 22th Nov 1938 | Box 8 \ 1 01-page70 | |
| Clutch finger setting procedure for Wraith and Bentley models. | 24th Jan 1939 | Box 8 \ 1 01-page71 | |
| Letter from Elliott Brothers detailing the repair of Speedometer No. 11023. | 1st Jul 1914 | Box 8 \ 2 02-page01 | |
| Repair and charges for speedometer number 11023. | 4th Jul 1913 | Box 8 \ 2 02-page02 | |
| Broken Elliott speedometer from Experimental Car 2100.E and its return to the factory stores. | 22th Aug 1913 | Box 8 \ 2 02-page03 | |
| Broken Elliott speedometer returned from Vienna, and a query to establish its departmental ownership. | 27th Aug 1913 | Box 8 \ 2 02-page04 | |
| Specification for an Elliott-type speedometer driven by a raw hide belt. | 18th Aug 1916 | Box 8 \ 2 02-page05 | |
| Letter from Elliott Brothers to Rolls-Royce requesting the required length of a flexible drive for a revolution counter on a plane. | 24th Oct 1917 | Box 8 \ 2 02-page06 | |
| Selection and design specifications for a speedometer and its drive mechanism. | 1st May 1919 | Box 8 \ 2 02-page07 | |
| Instructions on the positioning of the speedometer and its cable. | 1st May 1919 | Box 8 \ 2 02-page08 | |
| Hand-drawn schematic of a speedometer drive mechanism. | 9th Jan 1922 | Box 8 \ 2 02-page09 | |
| Conference with a representative from Messrs. Elliott about a chassis speedometer. | 7th May 1919 | Box 8 \ 2 02-page10 | |
| The provision of a standard Elliott Speedometer Drive for chassis testing. | 20th May 1919 | Box 8 \ 2 02-page11 | |
| Procurement of a specific clock from Messrs Elliott Brothers for the instrument board, to match the existing speedometer. | 23th Jun 1919 | Box 8 \ 2 02-page12 | |
| Request for a longer speedometer flexible drive and a follow-up on an ordered clock for chassis 1.E.X. | 23th Jun 1919 | Box 8 \ 2 02-page13 | |
| The incorrect length of the flexible drive for the speedometer on a 40/50HP chassis. | 23th Jun 1919 | Box 8 \ 2 02-page14 | |
| Finish of a clock speedometer supplied by Messrs. Elliott's and suggesting the same finish for the clock dial. | 28th Jul 1919 | Box 8 \ 2 02-page15 | |
| Requesting the return of a faulty speedometer to its manufacturer, Messrs. Elliott, for correction. | 23th Sep 1919 | Box 8 \ 2 02-page16 | |
| Three schemes submitted for a speedometer driving pulley. | 25th Sep 1919 | Box 8 \ 2 02-page17 | |
| Correspondence regarding a mix-up with a speedometer received from the supplier Elliott Bros. | 27th Oct 1919 | Box 8 \ 2 02-page18 | |
| Letter from Elliott Brothers regarding the testing of a returned speedometer which was reading high. | 22th Oct 1919 | Box 8 \ 2 02-page19 | |
| Clarifying the need for an expanding pulley instead of a split pulley from supplier Messrs. Elliott Bros. | 11th Dec 1919 | Box 8 \ 2 02-page20 | |
| Letter clarifying an order for speedometer parts with Messrs. Elliott Bros. | 19th Dec 1919 | Box 8 \ 2 02-page21 | |
| The correct Elliott speedometer types for the chassis. | 30th Jan 1920 | Box 8 \ 2 02-page22 | |
| Letter to Messrs. Elliott Bros. (London) Ltd. complaining about the unexpected delivery of a watch to Derby. | 16th Dec 1920 | Box 8 \ 2 02-page23 | |
| Urgent request for an Elliott Speedometer for a 'Goshawk' car with specific drive, gear ratio, and wheel size requirements. | 31th Dec 1920 | Box 8 \ 2 02-page24 | |
| Requesting an order to be issued for the repair of an Elliott Speedometer, No. 28800. | 21th Jan 1921 | Box 8 \ 2 02-page25 | |
| Requesting an order for an Elliott Speedometer for the 'Goshawk I'. | 16th Feb 1921 | Box 8 \ 2 02-page26 | |
| Poor performance of Elliott speedometers and considering Waltham speedometers as a replacement. | 15th Jul 1921 | Box 8 \ 2 02-page27 | |
| Comparing the Waltham and Elliott speedometers, discussing reliability, operation, and readability. | 18th Jul 1921 | Box 8 \ 2 02-page28 | |
| Comparing the reliability and cost of Elliott, Waltham, Watford, and Smith speedometers. | 12th Sep 1921 | Box 8 \ 2 02-page29 | |
| Sending a speedometer for urgent repair for the Hawk Northcliffe experimental car No. 3. | 11th Nov 1922 | Box 8 \ 2 02-page30 | |
| Letter to Elliott Bros. regarding the urgent repair of a speedometer from experimental car No.3. | 6th Nov 1922 | Box 8 \ 2 02-page31 | |
| Speedometer correction test results for the Hawk Northcliffe car's Elliott speedometer. | 23th Nov 1922 | Box 8 \ 2 02-page32 | |
| The despatch of a speedometer for repair to Messrs. Elliott Bros. | 18th Dec 1922 | Box 8 \ 2 02-page33 | |
| Tests to determine whether an Elliott speedometer shows any lag in following up speed during acceleration. | 15th Jan 1923 | Box 8 \ 2 02-page34 | |
| Page detailing two methods for calculating acceleration, one based on time and the other using a speedometer. | 15th Jan 1923 | Box 8 \ 2 02-page35 | |
| Test report on speedometer lag during acceleration at different speeds. | 27th Jan 1923 | Box 8 \ 2 02-page36 | |
| Speedometer test results for a 49-GB car, comparing indicated versus actual speeds. | 27th Jan 1923 | Box 8 \ 2 02-page37 | |
| Speedometer readings for the 3-EX car, comparing indicated versus actual speeds. | 1st Feb 1923 | Box 8 \ 2 02-page38 | |
| Sending an Elliott Speedometer to the makers for repair. | 1st Feb 1923 | Box 8 \ 2 02-page39 | |
| Test report on the accuracy of an Elliott speedometer on car 6.EX. | 1st Feb 1923 | Box 8 \ 2 02-page40 | |
| Instruction sheet regarding a faulty Elliott speedometer that has failed twice. | 30th Apr 1923 | Box 8 \ 2 02-page41 | |
| Calibration results for an Elliott Speedometer, number 30066, from tests conducted on two separate dates. | 14th May 1923 | Box 8 \ 2 02-page42 | |
| Test report on the 3.EX (HAWK) Speedometer and Mileometer performance with varying tyre pressures. | 1st Jun 1923 | Box 8 \ 2 02-page43 | |
| The receipt of two sets of new Elliott 'M' type speedometers for testing on the 40/50 HP and 20 HP car models. | 26th Feb 1924 | Box 8 \ 2 02-page44 | |
| List of parts and particulars for Elliott Speedometers. | 26th Feb 1924 | Box 8 \ 2 02-page45 | |
| Change of speedometers for the 40/50 HP chassis. | 4th Jun 1924 | Box 8 \ 2 02-page46 | |
| Speedometer types, reduction gear issues, and proposed solutions for the 40/50 HP chassis. | 5th Jun 1924 | Box 8 \ 2 02-page47 | |
| Letter regarding the inspection of 40/50 HP speedometers supplied by Elliotts. | 6th Jun 1924 | Box 8 \ 2 02-page48 | |
| Letter regarding Elliotts 40/50 speedometers, discussing instruments for testing and the length of the flexible drive. | 26th Jun 1924 | Box 8 \ 2 02-page49 | |
| Two Elliott Speedometers sent for testing on 40/50 Chassis. | 8th Aug 1924 | Box 8 \ 2 02-page50 | |
| Testing and reliability of an Elliott speedometer compared to an A.T. model. | 10th Mar 1925 | Box 8 \ 2 02-page51 | |
| Faults found with an Elliott speedometer and comparing it to an A.T. principle model. | 11th Mar 1925 | Box 8 \ 2 02-page52 | |
| Return of Elliott speedometers and considering testing Smith Company speedometers as an alternative. | 12th Mar 1925 | Box 8 \ 2 02-page53 | |
| Follow-up communication regarding the return of Elliott Speedometers. | 2nd Apr 1925 | Box 8 \ 2 02-page54 | |
| Returning two Elliott speedometers that were loaned for testing. | 6th Apr 1925 | Box 8 \ 2 02-page55 | |
| Return of unsatisfactory Elliott speedometers. | 22th Apr 1925 | Box 8 \ 2 02-page56 | |
| Progress of speedometers sent by Messrs. Elliott Bros. | 27th Apr 1925 | Box 8 \ 2 02-page57 | |
| Chasing a reply to a previous communication regarding Elliott Speedometers. | 1st May 1925 | Box 8 \ 2 02-page58 | |
| Following up on the progress of four speedometers sent in by Messrs. Elliott Bros. | 27th Apr 1925 | Box 8 \ 2 02-page59 | |
| Alternative Wraith connecting rod design and manufacturing process. | 16th Mar 1935 | Box 8 \ 3 03-page01 | |
| Letter to The Hughes-Johnson Stampings Ltd. arranging a meeting to discuss forged connecting rods. | 2nd Feb 1937 | Box 8 \ 3 03-page02 | |
| Letter to The Hughes-Johnson Stampings Ltd. arranging a meeting to discuss forged finished connecting rods. | 9th Feb 1937 | Box 8 \ 3 03-page03 | |
| Letter from The Hughes-Johnson Stampings Ltd arranging an interview to discuss Connecting Rods. | 10th Feb 1937 | Box 8 \ 3 03-page04 | |
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