| Description | Date | Identifier | |
| Proposal to improve road clearance on Phantom and 20 HP models by modifying the exhaust pipe and petrol tank sump. | 9th Jul 1927 | Box 8 \ 4 04-page080 | |
| Revised chassis rear end for EAC.7 and shifting work to a complete revision for EAC.10. | 8th Jul 1927 | Box 8 \ 4 04-page081 | |
| Sending chassis numbers 2593/4 for safekeeping with instructions to halt any work. | 5th May 1928 | Box 8 \ 4 04-page082 | |
| Valve gear, cam design, and tappet clearance settings for Phantom and EAC.10 engines. | 7th May 1928 | Box 8 \ 4 04-page083 | |
| Changes to feeler gauges, cam lengths, and camshaft angles for the Phantom engine. | 17th May 1928 | Box 8 \ 4 04-page084 | |
| Chassis development, planned modifications, and parts required for three chassis. | 17th May 1928 | Box 8 \ 4 04-page085 | |
| Continued memorandum urging the need to push forward with improvements and reduce development time. | 19th May 1928 | Box 8 \ 4 04-page086 | |
| Reminder to supply figures for tappet clearance variations on Phantom engines. | 19th May 1928 | Box 8 \ 4 04-page087 | |
| Positioning of a 2-level device and sump design for the 20 HP petrol tank. | 23th May 1928 | Box 8 \ 4 04-page088 | |
| Specification sheet for the 14-EX model detailing buffer, wing, and spring clearance and camber measurements. | 4th Jun 1928 | Box 8 \ 4 04-page089 | |
| Axial clearance on rocker lever basses for a Phantom new aluminium head. | 4th Jun 1928 | Box 8 \ 4 04-page090 | |
| Modifications to frame heights and related components like axles, springs, and hypoids. | 5th Jun 1928 | Box 8 \ 4 04-page091 | |
| Requesting clearance improvements from the Phantom model be applied to the 20 HP model's valve guides. | 12th Jun 1928 | Box 8 \ 4 04-page092 | |
| The valve clearance for a Phantom model with an aluminium head. | 25th Jun 1928 | Box 8 \ 4 04-page093 | |
| Front and rear wheel clearances for the India 3 model. | 26th Jun 1928 | Box 8 \ 4 04-page094 | |
| Complaints of excessive wheel arch clearance on the 20 HP model with proposals for new clearances. | 3rd Jul 1928 | Box 8 \ 4 04-page095 | |
| Springing specifications, buffer clearances, and damper fittings for the Phantom car. | 24th Jul 1928 | Box 8 \ 4 04-page096 | |
| Complaints about springing and spring breakages on various car models. | 23th Jul 1928 | Box 8 \ 4 04-page097 | |
| Springing issues with the 20 HP car, discussing customer complaints, continental performance, and potential solutions. | 23th Jul 1928 | Box 8 \ 4 04-page098 | |
| The suspension issues, spring deflection, and controllability of the Phantom & 40/50 HP models. | 8th Aug 1928 | Box 8 \ 4 04-page099 | |
| Reduction in height for the wheel arches on a 20 HP car with 5¼' tyres and 21' rims. | 8th Aug 1928 | Box 8 \ 4 04-page100 | |
| Buffer penetration tests and wheel arch clearances for different tyre sizes. | 23th Aug 1928 | Box 8 \ 4 04-page101 | |
| Wheel and chassis specifications for a new 4-seater saloon cabriolet model 'SS'. | 6th Sep 1928 | Box 8 \ 4 04-page102 | |
| Different spring specifications and buffer clearances for various driving conditions. | 1st Sep 1928 | Box 8 \ 4 04-page103 | |
| Technical memorandum detailing front spring buffer clearance specifications and comparison with the 'F-2-B' Phantom model. | 29th Sep 1928 | Box 8 \ 4 04-page104 | |
| Engine valve clearances and the reuse of cylinder gaskets due to settling issues. | 10th Oct 1928 | Box 8 \ 4 04-page105 | |
| Modification to the starting handle bracket to improve clearance between the radiator and fan. | 18th Oct 1928 | Box 8 \ 4 04-page106 | |
| Incorrect heelboard length on car 19-EX and a request for a replacement part. | 20th Oct 1928 | Box 8 \ 4 04-page107 | |
| Increasing the clearance between the fan and radiator by reconstructing the starting handle bracket. | 18th Oct 1928 | Box 8 \ 4 04-page108 | |
| Distributing drawing N.sch.2720 showing wheel arch clearances for 18-EX and 'SS' car models. | 13th Oct 1938 | Box 8 \ 4 04-page109 | |
| Alteration of chassis prints to accommodate coachwork clearances for the 20 HP chassis. | 23th Oct 1928 | Box 8 \ 4 04-page110 | |
| Valve clearances, gasket settling, and the re-fitting of gaskets on 20 HP engines. | 29th Oct 1928 | Box 8 \ 4 04-page111 | |
| Secret memo regarding wheelarch clearances for the Peregrone 2 model. | 18th Apr 1932 | Box 8 \ 4 04-page112 | |
| Bensport wheel arch clearances, referencing schedule 3485. | 9th Jun 1932 | Box 8 \ 4 04-page113 | |
| Check test on tappet clearance variation on a Peregrine engine. | 4th Apr 1933 | Box 8 \ 4 04-page114 | |
| Dispatch of drawings and material recommendations for the Wraith engine. | 17th Dec 1934 | Box 8 \ 5 05-page01 | |
| List of recommendations concerning the Wraith crank. | 14th Dec 1936 | Box 8 \ 5 05-page02 | |
| Small modifications to the Wraith III Crankshaft to reduce manufacturing costs. | 5th Mar 1937 | Box 8 \ 5 05-page03 | |
| Order for four Wraith crankshafts with material and crankpin design alterations. | 25th May 1937 | Box 8 \ 5 05-page04 | |
| Request to alter the drawings for the Wraith crankshaft damper flywheel to include oil drain holes. | 22th May 1937 | Box 8 \ 5 05-page05 | |
| Requesting an alteration to the Wraith crankshaft drawing based on tests carried out on the Bentley. | 30th Jun 1937 | Box 8 \ 5 05-page06 | |
| Request to adapt the oil retainer disc for the Wraith III No.6 crankshaft assembly. | 13th Sep 1937 | Box 8 \ 5 05-page07 | |
| Production instruction for six sets of the Wraith III chassis crankshaft, section 5010. | 22th Sep 1937 | Box 8 \ 5 05-page08 | |
| Requesting details for an experiment to increase the size of crankshaft balance weights on the Wraith III engine. | 1st Nov 1937 | Box 8 \ 5 05-page09 | |
| Denying a request to delete the collar from the crankshaft front journal oil cap stud for the Wraith III. | 17th Nov 1937 | Box 8 \ 5 05-page10 | |
| Design modification for the Wraith III crankshaft rear end oil retainer, including a hand-drawn diagram. | 17th Nov 1937 | Box 8 \ 5 05-page11 | |
| Instruction regarding new drawings for large and small balance weights for the Wraith III Chassis crankshaft. | 26th Nov 1937 | Box 8 \ 5 05-page12 | |
| The incorporation of new increased inertia balance weights for the Wraith III crankshaft. | 29th Nov 1937 | Box 8 \ 5 05-page13 | |
| Instruction to manufacture two Wraith crankshafts from .4 carbon steel. | 13th Dec 1937 | Box 8 \ 5 05-page14 | |
| Alterations to the Wraith spring drive damper to overcome crankshaft periods. | 15th Dec 1937 | Box 8 \ 5 05-page15 | |
| Experimental Wraith crankshafts, comparing different steel types and the effect of nickel content. | 29th Dec 1937 | Box 8 \ 5 05-page16 | |
| Decision on the material selection for Wraith crankshafts. | 30th Dec 1937 | Box 8 \ 5 05-page17 | |
| Experimental crankshaft damper with a solid drive for the fan pulley for the Wraith III. | 5th Jan 1938 | Box 8 \ 5 05-page18 | |
| Requesting a Wraith crankshaft for deflection tests to fit Packard type balance weights. | 6th Jan 1938 | Box 8 \ 5 05-page19 | |
| W. III & B III Crankshaft with Packard Type Balance Weights. | 18th Jan 1938 | Box 8 \ 5 05-page20 | |
| Oil retaining scheme for the Wraith crankshaft rear end. | 15th Feb 1938 | Box 8 \ 5 05-page21 | |
| The fitting of a Crankshaft Damper with Solid Drive for the Fan Pulley on the Wraith model. | 1st Mar 1938 | Box 8 \ 5 05-page22 | |
| Wraith Spring Drive and fitting a crankshaft damper. | 2nd Mar 1938 | Box 8 \ 5 05-page23 | |
| The oil retaining device for the Wraith crankshaft rear end, which is holding up the release of 100 sets of parts. | 22th Mar 1938 | Box 8 \ 5 05-page24 | |
| The standardization of turned finish crankshaft webs for various car models. | 13th Mar 1938 | Box 8 \ 5 05-page25 | |
| Letter to The British Goodrich Co. Ltd. inquiring about cylindrical rubber blocks to replace coiled springs in an experimental apparatus. | 8th Jun 1938 | Box 8 \ 5 05-page26 | |
| Letter from British Tyre & Rubber Co. Ltd. regarding a blueprint for a mould to produce reinforced rubber blocks. | 17th Jun 1938 | Box 8 \ 5 05-page27 | |
| Blueprint showing the arrangement of a mould for a compression block. | 13th Jun 1938 | Box 8 \ 5 05-page28 | |
| Modifications to the Wraith III and Bentley 111 dynamo drive to increase torsional flexibility. | 12th Jul 1938 | Box 8 \ 5 05-page29 | |
| The blueprint for a modified flexible coupling dynamo drive for the Wraith III chassis. | 22th Jul 1938 | Box 8 \ 5 05-page30 | |
| Notes on the Spring Drive and Crankshaft Damper for Wraith III, B.III & B.50 models. | 1st Aug 1938 | Box 8 \ 5 05-page31 | |
| Letter to The Manganese Bronze & Brass Co. Ltd. requesting suggestions for a flexible rubber coupling for a dynamo drive. | 20th Aug 1938 | Box 8 \ 5 05-page32 | |
| Letter from The Manganese Bronze & Brass Co. Ltd. regarding a 'Dynaflex' Wraith III Dynamo Drive Shear Rubber Coupling. | 24th Aug 1938 | Box 8 \ 5 05-page33 | |
| Letter from a supplier regarding a Wraith III Dynamo 'Couploflex' coupling. | 13th Sep 1938 | Box 8 \ 5 05-page34 | |
| Page 2 of a letter from The Manganese Bronze & Brass Co. Ltd. regarding business terms. | 13th Sep 1938 | Box 8 \ 5 05-page35 | |
| Drawing of a flexible coupling for a compressor drive. | 4th May 1938 | Box 8 \ 5 05-page36 | |
| Technical report detailing the results of a Wraith crankshaft bending test. | 22th Sep 1938 | Box 8 \ 5 05-page37 | |
| Page from a report detailing the mathematical equation for displacements represented by a family of ellipses. | 22th Sep 1938 | Box 8 \ 5 05-page38 | |
| Diagram illustrating the results of a crankshaft bending test for the Wraith model. | 19th Sep 1938 | Box 8 \ 5 05-page39 | |
| Blueprint diagram illustrating the results of a bending test on a Wraith model crankshaft. | 19th Sep 1938 | Box 8 \ 5 05-page40 | |
| Blueprint diagram showing the results of a bending test on a Wraith model crankshaft. | 19th Sep 1938 | Box 8 \ 5 05-page41 | |
| Blueprint showing four graphs from a Wraith crankshaft bending test, plotting deflections against loads. | 17th Sep 1938 | Box 8 \ 5 05-page42 | |
| Diagram illustrating the results of a crankshaft bending test for a Wraith model. | 19th Sep 1938 | Box 8 \ 5 05-page43 | |
| Blueprint detailing the results of a crankshaft bending test for the Wraith model. | 20th Sep 1938 | Box 8 \ 5 05-page44 | |
| Crankshaft bending test results for the Wraith model, showing deflections under varying loads and directions. | 20th Sep 1938 | Box 8 \ 5 05-page45 | |
| Adaptation of a 'Dynaflex' coupling for the Wraith III dynamo drive. | 23th Sep 1938 | Box 8 \ 5 05-page46 | |
| Letter to The Manganese Bronze & Brass Co. Ltd. regarding the suitability of a rubber coupling for an engine. | 28th Sep 1938 | Box 8 \ 5 05-page47 | |
| Failure of softer dynamo drive rubbers and the plan to revert to the original part. | 10th Oct 1938 | Box 8 \ 5 05-page48 | |
| Letter to The Manganese Bronze & Brass Co. regarding the production of a modified coupling. | 11th Oct 1938 | Box 8 \ 5 05-page49 | |
| Letter concerning the cost and delivery of new and existing couplings for trials. | 13th Oct 1938 | Box 8 \ 5 05-page50 | |
| Letter to The Manganese Bronze & Brass Co. putting a trial for experimental couplings on hold due to cost. | 17th Oct 1938 | Box 8 \ 5 05-page51 | |
| Letter concerning the modification of moulds for coupling ECD.914. | 19th Oct 1938 | Box 8 \ 5 05-page52 | |
| Letter to a supplier regarding a mould cost reduction for a coupling and potential design modifications. | 20th Oct 1938 | Box 8 \ 5 05-page53 | |
| Note regarding W.III and B.60 crankshafts with a reference to another file. | 27th Oct 1938 | Box 8 \ 5 05-page54 | |
| Suggestion for a more flexible dynamo drive for the Wraith III, which could be made from aluminium die-casting. | 4th Nov 1938 | Box 8 \ 5 05-page55 | |
| Letter from The Manganese Bronze & Brass Co. Ltd. chasing a response regarding a coupling design. | 28th Nov 1938 | Box 8 \ 5 05-page56 | |
| Letter to a supplier regarding a flexible coupling design and a request for quotation. | 30th Nov 1938 | Box 8 \ 5 05-page57 | |
| Letter from The Manganese Bronze & Brass Co. Ltd. clarifying a technical enquiry regarding torsional flexibility and torque for a coupling. | 2nd Dec 1938 | Box 8 \ 5 05-page58 | |
| Letter to The Manganese Bronze & Brass Co. providing specifications on maximum torque and rate of flexibility. | 5th Dec 1938 | Box 8 \ 5 05-page59 | |
| Letter from a supplier discussing the suitability and safety factor of a 'Couploflex' Generator Coupling, addressing torque and torsional vibration concerns. | 9th Dec 1938 | Box 8 \ 5 05-page60 | |
| Comparison of various schemes for crankshaft balance weights for the Wraith III engine. | 29th Dec 1938 | Box 8 \ 5 05-page61 | |
| Comparison of bearing loads and pressures for different balance weight schemes. | 29th Dec 1938 | Box 8 \ 5 05-page62 | |
| Technical memo comparing two engine schemes based on their effects on bearings and critical speed. | 29th Dec 1938 | Box 8 \ 5 05-page63 | |
| Request to modify the drawing for the Wraith 'C' Series rear main bearing crankshaft. | 18th Apr 1939 | Box 8 \ 5 05-page64 | |
| Cost estimation and analysis for a Smith Crankshaft, comparing versions with and without integral balance weights. | 17th Jun 1919 | Box 8 \ 5 05-page65 | |
| | | | |
