| Description | Date | Identifier | |
| The failure of a clamping bolt pad on a 40/50 HP Steering Box and Mr. Royce's proposed design alteration. | 9th Mar 1920 | West Wittering \ D \ March1920 Scan6 | |
| With diagrams discussing the design of rear leaf springs, comparing current and proposed practices. | 8th Mar 1920 | West Wittering \ D \ March1920 Scan7 | |
| Spring design, addressing issues with friction, squeaking, and reverting to a former practice. | 1st Mar 1920 | West Wittering \ D \ March1920 Scan8 | |
| Modifications to the 'Goshawk' starting motor, involving a new reduction gear and clutch. | 26th Mar 1931 | West Wittering \ D \ March1920 Scan9 | |
| The benefits of greasing electrical switches with vaseline to prevent oxidation. | 10th Mar 1920 | West Wittering \ D \ March1920 Scan10 | |
| Problem of excessive floor heat in the front seat and a potential solution of removing the under-car mudguard. | 9th Mar 1920 | West Wittering \ D \ March1920 Scan11 | |
| Passenger comfort in the 10,000 Miles Trials Car compared to modern open cars. | 10th Mar 1920 | West Wittering \ D \ March1920 Scan12 | |
| Modifications and connection issues for Smith and Lucas car dynamos. | 13th Mar 1920 | West Wittering \ D \ March1920 Scan13 | |
| Improvements to a Lucas dynamo's terminal connections to rectify issues with bad contacts. | 19th Mar 1928 | West Wittering \ D \ March1920 Scan14 | |
| Requesting an alteration to conductor connections and ensuring Lucas machines are made safe before dispatch. | 1st Mar 1920 | West Wittering \ D \ March1920 Scan15 | |
| Complaint of heat and analyzing scuttle ventilation on the 10,000 Miles Trials Car. | 11th Mar 1920 | West Wittering \ D \ March1920 Scan16 | |
| The action of a chassis dynamo auto switch and proposals for its improvement. | 15th Mar 1920 | West Wittering \ D \ March1920 Scan17 | |
| Electrical resistance and power distribution in an actuating magneto coil to reduce error in a Lucas switch. | 1st Mar 1920 | West Wittering \ D \ March1920 Scan18 | |
| Performance of Chloride and Tudor accumulators and updates to the instruction book. | 16th Mar 1920 | West Wittering \ D \ March1920 Scan19 | |
| Technical memo about experiences with portable and stationary accumulator cells, focusing on maintenance, charging, and dynamo regulation. | 18th Mar 1920 | West Wittering \ D \ March1920 Scan20 | |
| Cause and proposed solution for piston rattles. | 26th Mar 1920 | West Wittering \ D \ March1920 Scan21 | |
| Construction specifications for two types of dynamos. | 24th Mar 1920 | West Wittering \ D \ March1920 Scan22 | |
| Specifications for building an armature, including materials, winding, and testing procedures. | 1st Mar 1920 | West Wittering \ D \ March1920 Scan23 | |
| Expected performance and efficiency of a dynamo compared to other systems. | 1st Mar 1920 | West Wittering \ D \ March1920 Scan24 | |
| Continued use of nickel copper filter gauze until it proves defective or a superior option is found. | 24th Mar 1920 | West Wittering \ D \ March1920 Scan25 | |
| Ignition plug testing, materials, and specifications. | 29th Mar 1920 | West Wittering \ D \ March1920 Scan26 | |
| Clarifying the rear axle gear ratios for the 'Buzzard' and 'Vulture' engines. | 30th Mar 1929 | West Wittering \ D \ March1920 Scan27 | |
| Observations of balancing speeds for Lucas and Smith chassis lighting dynamos. | 4th Mar 1920 | West Wittering \ D \ March1920 Scan28 | |
| Dynamo temperature tests, battery E.M.F. values, and cutting-in speeds. | 4th Mar 1920 | West Wittering \ D \ March1920 Scan29 | |
| Report comparing performance characteristics of Smith type A and 2D dynamos under different temperature conditions. | 4th Mar 1920 | West Wittering \ D \ March1920 Scan30 | |
| Experimental investigation and comparison of Lucas and Smith dynamos, noting performance, cutting-in speeds, and defects. | 4th Mar 1920 | West Wittering \ D \ March1920 Scan31 | |
| Follow-up communication about arranging a meeting with the Smith Company to discuss and inspect a machine. | 4th Mar 1920 | West Wittering \ D \ March1920 Scan32 | |
| Observations of cutting in speeds for Lucas chassis lighting dynamos. | 4th Mar 1920 | West Wittering \ D \ March1920 Scan33 | |
| Observations on the cutting in speeds of chassis lighting dynamos, specifically II Smith (T & M) dynamos. | 4th Mar 1920 | West Wittering \ D \ March1920 Scan34 | |
| Experiments comparing Lucas and Smith standard cut-outs. | 5th Mar 1920 | West Wittering \ D \ March1920 Scan35 | |
| Test report on the current required to operate and de-operate various electrical cut-outs. | 1st Mar 1920 | West Wittering \ D \ March1920 Scan36 | |
| The performance and overheating issues of Lucas and Smith electrical cut-outs when hot. | 5th Mar 1920 | West Wittering \ D \ March1920 Scan37 | |
| Comparing the performance of a Lucas component with a Smith cut-out, focusing on dynamo output and battery charging characteristics. | 5th Mar 1920 | West Wittering \ D \ March1920 Scan38 | |
| Continued memorandum discussing the performance variations of a dynamo between two specific vehicles. | 5th Mar 1920 | West Wittering \ D \ March1920 Scan39 | |
| Visit from Messrs. Smith & Sons Ltd. concerning the potential supply of their Type A & 2D dynamos. | 13th Mar 1920 | West Wittering \ D \ March1920 Scan40 | |
| Dynamo improvements including magnetic humming reduction, insulating materials, and output performance. | 13th Mar 1920 | West Wittering \ D \ March1920 Scan41 | |
| Technical discussion on dynamo speeds, battery charging characteristics, and output specifications. | 13th Mar 1920 | West Wittering \ D \ March1920 Scan42 | |
| The temperature effects on cut-out operating voltage and the materials for contact points. | 13th Mar 1920 | West Wittering \ D \ March1920 Scan43 | |
| Consideration of alternative switchbox and cutout arrangements following the adoption of the Smith dynamo. | 13th Mar 1920 | West Wittering \ D \ March1920 Scan44 | |
| Comparison of Smith dynamos with Smith cut-outs versus Lucas dynamos with Lucas cut-outs. | 16th Mar 1920 | West Wittering \ D \ March1920 Scan45 | |
| Report page detailing the continued testing procedures and results for dynamo cut-outs, comparing Smith and Lucas models. | 16th Mar 1920 | West Wittering \ D \ March1920 Scan46 | |
| Comparison of the operating voltages for Lucas and Smith cut-outs under various test conditions. | 16th Mar 1920 | West Wittering \ D \ March1920 Scan47 | |
| The voltage required to operate Lucas and Smith cut-outs under battery and dynamo test conditions. | 16th Mar 1920 | West Wittering \ D \ March1920 Scan48 | |
| Test data for Lucas dynamos and cut-outs, comparing performance speeds under hot and cold conditions. | 16th Mar 1920 | West Wittering \ D \ March1920 Scan49 | |
| Test data for a Smith type A dynamo with both old and new cut-outs, under hot and cold conditions. | 16th Mar 1920 | West Wittering \ D \ March1920 Scan50 | |
| Test results and analysis for a Lucas E.5757 No. 402 dynamo and a new S.B. cut-out under hot and cold conditions. | 16th Mar 1920 | West Wittering \ D \ March1920 Scan51 | |
| Report comparing Lucas and Smith dynamo cut-outs, including details of a dismantled Lucas unit. | 16th Mar 1920 | West Wittering \ D \ March1920 Scan52 | |
| Continued discussion on shunt winding performance, reverse current, and cutting-in points relative to temperature and battery E.M.F. | 16th Mar 1920 | West Wittering \ D \ March1920 Scan53 | |
| Broken square-type shock absorber lever on the 2.EX Car, noting it has been condemned and should be replaced by the serrated lever. | 16th Mar 1920 | West Wittering \ D \ March1920 Scan54 | |
| The suitability of the Foxboro Thermometer for American chassis, detailing installation issues and future plans for thermostat control. | 16th Mar 1920 | West Wittering \ D \ March1920 Scan55 | |
| The Foxboro' Thermometer for use on the American chassis, comparing it with the Cambridge Thermometer. | 9th Jan 1925 | West Wittering \ D \ March1920 Scan56 | |
| American Chassis Parts, specifically B-G and Herz sparking plugs. | 17th Mar 1920 | West Wittering \ D \ March1920 Scan57 | |
| The unsuitability of a sample Champion spark plug and specifying desired features for plugs to be used in car work. | 7th Mar 1920 | West Wittering \ D \ March1920 Scan58 | |
| Unsuitability of single-point Champion spark plugs and requesting multi-point plug samples. | 6th Aug 1919 | West Wittering \ D \ March1920 Scan59 | |
| Failure of a new epicyclic gear due to lubrication issues in the planet wheel ball bearings. | 22th Mar 1920 | West Wittering \ D \ March1920 Scan60 | |
| The potential causes of failure in planet wheel ball bearings. | 22th Mar 1920 | West Wittering \ D \ March1920 Scan61 | |
| Requesting more battery sets be put on test for the rear frame position. | 7th May 1920 | West Wittering \ D \ May1920 Scan0 | |
| Modification to the depth of the rear 'Buzzard' frame. | 6th May 1920 | West Wittering \ D \ May1920 Scan1 | |
| Testing of a Smith dynamo with a Lucas cut-out and the ongoing design of a new cut-out. | 11th May 1920 | West Wittering \ D \ May1920 Scan2 | |
| Requesting a test to see if brake brackets can be bolted and sweated onto rear axle tubes instead of being brazed. | 11th May 1920 | West Wittering \ D \ May1920 Scan3 | |
| Designs for the 'Buzzard' wheelcase and gears, listing completed units. | 1st May 1920 | West Wittering \ D \ May1920 Scan4 | |
| Drawings for the 'Buzzard' chassis, specifically side channels and cross members. | 8th May 1920 | West Wittering \ D \ May1920 Scan5 | |
| The creation of a reference sheet for the properties and faults of resistance wires made from various alloys. | 17th May 1920 | West Wittering \ D \ May1920 Scan6 | |
| Rejection of poor quality steel castings and proposing a new design with forgings. | 17th May 1920 | West Wittering \ D \ May1920 Scan7 | |
| Alternative materials and manufacturing methods for engine components, specifically castings and exhaust pipe nozzles. | 1st May 1920 | West Wittering \ D \ May1920 Scan8 | |
| Modifications and manufacturing suggestions for an exhaust pipe fitting, flange, and cutout box. | 1st May 1920 | West Wittering \ D \ May1920 Scan9 | |
| Requesting criticism on dynamo and motor curves, and discussing potential motor redesign. | 20th May 1920 | West Wittering \ D \ May1920 Scan10 | |
| The receipt and requested performance testing of an aero type dynamo. | 19th May 1920 | West Wittering \ D \ May1920 Scan11 | |
| Design change to the 'Buzzard' crankshaft extension. | 30th May 1930 | West Wittering \ D \ May1920 Scan12 | |
| The 'Buzzard' Valve Gear, sending drawing No. Lec.1236 and noting the worm driving gear design is not yet final. | 1st May 1920 | West Wittering \ D \ May1920 Scan13 | |
| Quoting Mr. Royce's request for resistance data of alloys relative to copper to enable calculations. | 26th May 1920 | West Wittering \ D \ May1920 Scan14 | |
| Letter discussing drawing No. Lec.1238, the general arrangement of the 'Buzzard' chassis, and required modifications. | 26th May 1920 | West Wittering \ D \ May1920 Scan15 | |
| Instructions and sketches for the 40/50 HP rear engine foot scheme. | 21th May 1920 | West Wittering \ D \ May1920 Scan16 | |
| Design modifications for various cantilever and steering components with sketches. | 1st May 1920 | West Wittering \ D \ May1920 Scan17 | |
| Continuation detailing criticisms of a securing bolt and steering box fixing. | 28th May 1920 | West Wittering \ D \ May1920 Scan18 | |
| Drawings for alterations to the 'Buzzard' and 40/50 HP chassis models. | 31th May 1920 | West Wittering \ D \ May1920 Scan19 | |
| Two alternative designs for the super-imposed type of connecting rods for the 'Buzzard' engine. | 29th May 1920 | West Wittering \ D \ May1920 Scan20 | |
| The performance curves of a non-trembler battery ignition standard coil, comparing different polarities. | 8th May 1920 | West Wittering \ D \ May1920 Scan21 | |
| Continuation page discussing the relationship between two phenomena and coil efficiency. | 8th May 1920 | West Wittering \ D \ May1920 Scan22 | |
| Graph showing maximum cap-speed curves for a present production battery ignition coil. | 5th May 1920 | West Wittering \ D \ May1920 Scan23 | |
| Blank cover page with a 'Received' date stamp from Derby. | 15th May 1920 | West Wittering \ D \ May1920 Scan24 | |
| The investigation and testing of Lucas E.575 dynamos and X.3770 cut-outs. | 14th May 1920 | West Wittering \ D \ May1920 Scan25 | |
| Investigation into the performance of electrical cut-outs for Lucas dynamos, detailing specification requirements and test results. | 14th May 1920 | West Wittering \ D \ May1920 Scan26 | |
| Report page detailing the investigation and inconsistent test results of various electrical cut-outs. | 14th May 1920 | West Wittering \ D \ May1920 Scan27 | |
| Analysis of faults and testing procedures for Lucas cut-outs and dynamos on the R.R. car. | 14th May 1920 | West Wittering \ D \ May1920 Scan28 | |
| Test procedure and observations for a cut-out device, noting voltage, speed and current measurements at different operational points. | 14th May 1920 | West Wittering \ D \ May1920 Scan29 | |
| Test data for Lucas Dynamos and Cut-outs showing performance under cold and hot conditions. | 14th May 1920 | West Wittering \ D \ May1920 Scan30 | |
| Test data sheet for two Lucas dynamos and cut-outs, detailing volts, amperes and speed under hot and cold conditions. | 14th May 1920 | West Wittering \ D \ May1920 Scan31 | |
| Test data sheet for two sets of Lucas dynamos and cut-outs, showing performance figures under hot and cold conditions. | 14th May 1920 | West Wittering \ D \ May1920 Scan32 | |
| Report comparing operating voltages of dynamo cut-outs and discussing measures to improve their uniformity. | 14th May 1920 | West Wittering \ D \ May1920 Scan33 | |
| Test results table for Lucas E.575 and X.1627 dynamo models. | 8th Apr 1920 | West Wittering \ D \ May1920 Scan34 | |
| Test table results for Lucas cut-out components under cold conditions. | 30th Apr 1920 | West Wittering \ D \ May1920 Scan35 | |
| Test table for a Lucas Cut-Out, showing operational data under cold and hot conditions. | 5th May 1920 | West Wittering \ D \ May1920 Scan36 | |
| Index for a report on a visit to West Wittering, detailing various car and engine parts. | 20th May 1920 | West Wittering \ D \ May1920 Scan37 | |
| Design changes for bonnet models and a rear engine foot bracket following a visit to West Wittering. | 12th May 1920 | West Wittering \ D \ May1920 Scan38 | |
| Design notes on securing a steering box and the construction of a sheet metal silencer outlet pipe nozzle for a 40/50 HP model. | 1st May 1920 | West Wittering \ D \ May1920 Scan39 | |
| Design suggestions for an exhaust pipe and cut-out flange, including material thickness and manufacturing methods. | 21th May 1920 | West Wittering \ D \ May1920 Scan40 | |
| Design notes on rear springs and front shock absorber anchorages for the 40/50 HP chassis. | 18th May 1920 | West Wittering \ D \ May1920 Scan41 | |
| Design considerations for new large chassis and engines, including Vulture, Buzzard, and Condor models. | 18th May 1920 | West Wittering \ D \ May1920 Scan42 | |
| Continued report discussing engine crankcases, bearings, chassis frames, and works equipment. | 1st May 1920 | West Wittering \ D \ May1920 Scan43 | |
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