| Description | Date | Identifier | |
| Recommendation regarding carburetter flooding on the Phantom III model, suggesting machining the induction pipe flange at an angle. | 28th Mar 1938 | Box 93 \ 2 scan0229 | |
| The sending of various packings and washers to stores with a request for despatch to Cricklewood. | 29th Mar 1938 | Box 93 \ 2 scan0230 | |
| Dispatch of parts to address a difficult starting issue with a Phantom III carburettor. | 29th Mar 1938 | Box 93 \ 2 scan0231 | |
| Flooding tests for the Phantom III Stromberg T.P.C. 42 carburettor. | 4th Apr 1948 | Box 93 \ 2 scan0232 | |
| Test report on carburettor float mechanism, seatings, and needles, including buoyancy and flood tests. | 4th Apr 1938 | Box 93 \ 2 scan0233 | |
| Buoyancy curve graph for Phantom III F.EC 42 Stromberg carburettors with a 1/2 degree backward tilt. | 13th Apr 1938 | Box 93 \ 2 scan0234 | |
| Faulty Phantom III carburetters causing flooding, attributing the issue to the needle finish. | 13th Apr 1938 | Box 93 \ 2 scan0235 | |
| Requesting an order number for servicing work on Phantom III carburetters from two chassis. | 13th Apr 1938 | Box 93 \ 2 scan0236 | |
| The supply and standardisation of Anodic Oxide treated petrol drain ball valves for the Phantom III and 30 HP Wraith. | 30th Apr 1938 | Box 93 \ 2 scan0237 | |
| Price list for carburettors and a clutch for various car models. | 13th Jul 1938 | Box 93 \ 2 scan0238 | |
| Requesting an alteration to the mesh of carburetter filter gauze for the Wraith and Phantom III models. | 13th Jul 1938 | Box 93 \ 2 scan0239 | |
| Phantom III carburetter complaint regarding carbonising ball valves and a request for test parts. | 18th Jul 1938 | Box 93 \ 2 scan0240 | |
| Inspection report on a Phantom III carburetter (3CFA.19) following a fire. | 19th Aug 1938 | Box 93 \ 2 scan0241 | |
| Despatch of two excess Phantom III carburettors to the Zenith Co. for overhaul. | 31th Aug 1938 | Box 93 \ 2 scan0242 | |
| The service stock of Phantom III Carburetters for the Cricklewood location. | 1st Sep 1938 | Box 93 \ 2 scan0243 | |
| Graph comparing the power output curves (BHP and BMEP) for the Phantom III and Bentley III engines with open exhausts. | 1st Sep 1938 | Box 93 \ 2 scan0244 | |
| Review of a two-plate clutch for the Spectre model, comparing it to a single-plate clutch. | 17th Feb 1934 | Box 93 \ 3 scan0001 | |
| Connecting inner clutch plates by a spring ring and comparing figures with a Lincoln single plate clutch. | 17th Feb 1934 | Box 93 \ 3 scan0002 | |
| Design of the Spectre clutch, comparing a two-plate design against a single-plate. | 19th Feb 1934 | Box 93 \ 3 scan0003 | |
| Modifications for the Spectre clutch, specifically a new split casing and the addition of needle roller bearings. | 21th Feb 1934 | Box 93 \ 3 scan0004 | |
| Questioning the reconsideration of a double plate clutch design for the Spectre model. | 21th Feb 1934 | Box 93 \ 3 scan0005 | |
| Lubrication proposal for the Spectre clutch spigot bearing. | 26th Jun 1934 | Box 93 \ 3 scan0006 | |
| Modifications to the Spectre Clutch, proposing an aluminium flywheel cover for the second engine. | 19th Jul 1934 | Box 93 \ 3 scan0007 | |
| Design of a single-plate clutch for the Spectre model to replace the existing two-plate clutch. | 27th Jul 1934 | Box 93 \ 3 scan0008 | |
| Seizing of the Spectre clutch outboard bearing due to lack of lubrication and proposed modifications to the splines. | 30th Jul 1934 | Box 93 \ 3 scan0009 | |
| Damage caused by bifurcated rivetting on specific clutch driven members and instructions to use ordinary rivetting instead. | 20th Oct 1934 | Box 93 \ 3 scan0010 | |
| Revised and simplified design for the Spectre clutch. | 29th Oct 1934 | Box 93 \ 3 scan0011 | |
| Modifications to the Spectre single plate clutch and its associated components. | 5th Nov 1934 | Box 93 \ 3 scan0012 | |
| The substitution of a revised clutch pressure lever for the Spectre Single Plate Clutch. | 8th Nov 1934 | Box 93 \ 3 scan0013 | |
| Modification to the pedal forging and clutch operating lever for the Spectre single plate clutch. | 13th Nov 1934 | Box 93 \ 3 scan0014 | |
| Modification to the Spectre Single Plate Clutch to improve freedom from binding. | 14th Dec 1934 | Box 93 \ 3 scan0015 | |
| Technical memorandum discussing data on clutches for various chassis, focusing on pedal effort and separation. | 4th Feb 1935 | Box 93 \ 3 scan0016 | |
| Alterations to chassis pedal travel and feedback on a new single plate clutch. | 4th Feb 1935 | Box 93 \ 3 scan0017 | |
| Specification table comparing particulars for different clutch models. | 16th Feb 1933 | Box 93 \ 3 scan0018 | |
| Comparative table of clutch particulars for various car models. | 1st Feb 1935 | Box 93 \ 3 scan0019 | |
| Requesting a new clutch pedal be fitted to future chassis for the Spectre Clutch. | 11th Feb 1935 | Box 93 \ 3 scan0020 | |
| New thrust bearing for the Spectre Clutch on a Phantom type vehicle to reduce noise. | 11th Feb 1935 | Box 93 \ 3 scan0021 | |
| Modification to the Spectre clutch driven plate to resolve an issue when hot. | 12th Feb 1935 | Box 93 \ 3 scan0022 | |
| Assembly difficulty with the Spectre Clutch operating shaft, suggesting the use of a blank serration. | 22th Feb 1935 | Box 93 \ 3 scan0023 | |
| Design alternatives for the Spectre Clutch operating shaft and a requested modification. | 26th Feb 1935 | Box 93 \ 3 scan0024 | |
| Comparison of clutch data specifications for the Phantom II and Phantom III Spectre models. | 14th Mar 1935 | Box 93 \ 3 scan0025 | |
| Comparison of clutch data for the Phantom II and Phantom III Spectre models. | 14th Mar 1935 | Box 93 \ 3 scan0026 | |
| Increased clutch pedal travel for the Spectre model, with a comparison to the Phantom. | 14th Mar 1935 | Box 93 \ 3 scan0027 | |
| Communication proposing an increase in spring length due to a re-evaluation of loads and deflection. | 14th Mar 1935 | Box 93 \ 3 scan0028 | |
| Data sheet detailing clutch specifications for the Phantom and Spectre models. | 14th Mar 1935 | Box 93 \ 3 scan0029 | |
| Data sheet comparing clutch leverage and load characteristics for Phantom and Spectre models. | 14th Mar 1935 | Box 93 \ 3 scan0030 | |
| Comparison table of pressure, friction, and torque for Phantom and Spectre models. | 18th Mar 1935 | Box 93 \ 3 scan0031 | |
| Temporary scheme to increase the inertia of a crankshaft slipper flywheel for the Spectre project. | 18th Mar 1935 | Box 93 \ 3 scan0032 | |
| Requesting the detailing and production of parts to experimentally fit a slipper wheel to a No. 1 chassis. | 19th Mar 1935 | Box 93 \ 3 scan0033 | |
| Adding inertia to the Spectre single plate clutch using plasticene for measurement. | 21th Mar 1935 | Box 93 \ 3 scan0034 | |
| Request to provide a single plate flywheel and clutch to Walter Bell to determine its polar moment of inertia. | 21th Mar 1935 | Box 93 \ 3 scan0035 | |
| Clutch pedal return issue on Spectre and Bentley models and proposing a new spring specification as a remedy. | 2nd Apr 1935 | Box 93 \ 3 scan0036 | |
| Modifications to the Spectre Clutch Operation to reduce cost and improve accessibility. | 24th Apr 1935 | Box 93 \ 3 scan0037 | |
| Technical note on modifications to clutch operating levers and a complaint regarding oil leaks from the thrust bearing supply pipe. | 24th Apr 1935 | Box 93 \ 3 scan0038 | |
| Secret memo regarding modifications to the Spectre Clutch. | 26th Apr 1935 | Box 93 \ 3 scan0039 | |
| Request for a sketch showing how much inertia can be added to a Spectre flywheel without fouling the crankcase. | 7th May 1935 | Box 93 \ 3 scan0040 | |
| Failed needle bearing in the Spectre Clutch and a request to replace it with Oilite bushes. | 11th May 1935 | Box 93 \ 3 scan0041 | |
| The failure of a needle bearing in the Spectre flywheel and clutch assembly and a recommendation for further tests. | 13th May 1935 | Box 93 \ 3 scan0042 | |
| Modifications to the Spectre Clutch to deal with a needle roller bearing failure. | 13th May 1935 | Box 93 \ 3 scan0043 | |
| Experiment to fit a heavier flywheel to a Spectre car to resolve gearbox issues. | 21th May 1935 | Box 93 \ 3 scan0044 | |
| Clutch shaft with castellations in place of serrations for the Spectre model. | 29th May 1935 | Box 93 \ 3 scan0045 | |
| Urgent modification to the Spectre chassis clutch shaft, replacing serrations with castellations. | 29th May 1935 | Box 93 \ 3 scan0046 | |
| Modifications to the clutch for a Spectre 3-S-I vehicle undergoing a 10,000-mile test. | 30th May 1935 | Box 93 \ 3 scan0047 | |
| Specification of the Spectre Clutch for the next 8 chassis. | 31th May 1935 | Box 93 \ 3 scan0048 | |
| List of modifications relating to levers, clutch bearings, and clutch shafts. | 31th May 1935 | Box 93 \ 3 scan0049 | |
| Specification for the Spectre Clutch for the next 8 chassis. | 31th May 1935 | Box 93 \ 3 scan0050 | |
| Sheet 2 of a memo detailing modifications to clutch components and related parts. | 31th May 1935 | Box 93 \ 3 scan0051 | |
| Secret and urgent memo regarding the design improvements of a larger slipper flywheel for the Spectre model. | 31th May 1935 | Box 93 \ 3 scan0052 | |
| Modifications to the Spectre Clutch ball bearing and shaft fitting. | 6th Jun 1935 | Box 93 \ 3 scan0053 | |
| Secret memorandum regarding urgent modifications to the Spectre clutch, including a stiffened flywheel cover and operating levers. | 7th Jun 1935 | Box 93 \ 3 scan0054 | |
| Testing a new clutch fabric from Ferodo on the Spectre Clutch model. | 27th Jun 1935 | Box 93 \ 3 scan0055 | |
| To RHC requesting the change of a fabric coupling on the Spectre I car. | 11th Jul 1935 | Box 93 \ 3 scan0056 | |
| Secret memo detailing design updates to the Spectre Clutch, referencing schemes N.Sch.4578 and N.Sch.4507. | 8th Aug 1935 | Box 93 \ 3 scan0057 | |
| Changes and fitting instructions for the Spectre flywheel and clutch. | 8th Jun 1935 | Box 93 \ 3 scan0058 | |
| Comparison of weight and moment of inertia for two clutch types, a Double Plate and a Single Plate, trialled on the Spectre. | 22th Aug 1935 | Box 93 \ 3 scan0059 | |
| Requesting an order for modified 'Spectre Clutch' plates for testing due to sales complaints. | 5th Oct 1935 | Box 93 \ 3 scan0060 | |
| Trial of a long clutch centre from America for the Spectre clutch, requesting a set of parts be made. | 15th Oct 1935 | Box 93 \ 3 scan0061 | |
| New cover for the Phantom III clutch casing with increased ventilation aperture. | 5th Nov 1935 | Box 93 \ 3 scan0062 | |
| Modified intermediate lever needed for the increased inertia flywheel on the Phantom III. | 30th Nov 1935 | Box 93 \ 3 scan0063 | |
| Cost breakdown for Ph.III Clutch Borg & Beck centre plates for experimental and production orders. | 2nd Dec 1935 | Box 93 \ 3 scan0064 | |
| Modifications to the flywheel and clutch for the Phantom III. | 4th Dec 1935 | Box 93 \ 3 scan0065 | |
| The importance of balancing the flywheel and clutch to prevent vibration, referencing a specific issue with a 'red car'. | 9th Dec 1935 | Box 93 \ 3 scan0066 | |
| Requesting two experimental sets of 'Spectre' clutch springs with new specifications. | 11th Dec 1935 | Box 93 \ 3 scan0067 | |
| To RHC regarding the need to update obsolete splines on the driven member of Ph.III clutches for the first six Spectre units. | 23th Dec 1935 | Box 93 \ 3 scan0068 | |
| Distortion of Phantom III clutch pressure plates and a proposed stress-releasing treatment. | 23th Dec 1935 | Box 93 \ 3 scan0069 | |
| Feedback from Borg & Beck on issues with distorted Ph.III pressure plates. | 1st Jan 1936 | Box 93 \ 3 scan0070 | |
| Instruction to send a Phantom III clutch driven member and hubs to Messrs Borg & Beck for modification. | 4th Jan 1936 | Box 93 \ 3 scan0071 | |
| Experiments and analysis of different clutch plates for the Phantom III. | 5th Jan 1936 | Box 93 \ 3 scan0072 | |
| Technical memo discussing the performance and proposed modifications for Borg & Beck clutch plates. | 5th Jan 1936 | Box 93 \ 3 scan0073 | |
| Mechanical test report on the ultimate tensile strength of a 'Millenite' clutch pressure plate. | 10th Jan 1936 | Box 93 \ 3 scan0074 | |
| Lower than specified tensile strength and distortion of Ph.III Clutch Pressure Plates G.83381. | 11th Jan 1936 | Box 93 \ 3 scan0075 | |
| Use of Borg & Beck clutch components for the Phantom 111 production chassis. | 17th Jan 1936 | Box 93 \ 3 scan0076 | |
| New, stiffened pressure plate for the Phantom III clutch. | 20th Jan 1936 | Box 93 \ 3 scan0077 | |
| Stiffened pressure plate for the Phantom III clutch. | 20th Jan 1936 | Box 93 \ 3 scan0078 | |
| Solution for engine noise transmitted through the Phantom III clutch pedal. | 25th Jan 1936 | Box 93 \ 3 scan0079 | |
| Requesting an arbor be made for Borg & Beck driven plates for the Ph.III, detailing assembly procedures. | 28th Jan 1936 | Box 93 \ 3 scan0080 | |
| Note regarding a lightened flywheel with a stiffened clutch pressure plate for the Phantom III. | 30th Jan 1936 | Box 93 \ 3 scan0081 | |
| Lightened flywheel and stiffened clutch pressure plate for the Phantom III. | 30th Jan 1938 | Box 93 \ 3 scan0082 | |
| The dispatch of a Phantom III Clutch Plate arrangement to St. Pancras Station. | 11th Aug 1937 | Box 93 \ 3 scan0083 | |
| Rubber stop for the Clutch Pedal on the Phantom III model. | 30th Jan 1936 | Box 93 \ 3 scan0084 | |
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