| Description | Date | Identifier | |
| Sending drawing No. LeC.1132 for the RE 20 HP oil filter. | 3rd Sep 1919 | West Wittering \ C \ September1919 Scan6 | |
| Sending drawing LeC.1123 for the 20 HP oil sump. | 4th Sep 1919 | West Wittering \ C \ September1919 Scan7 | |
| Viscosity of lubricating oils for gearboxes and advising against using overly thick oils. | 4th Sep 1919 | West Wittering \ C \ September1919 Scan8 | |
| Piston policy, piston knocks, and the overall virtues of the cars. | 10th Sep 1919 | West Wittering \ C \ September1919 Scan9 | |
| Mr. Royce's suggested improvements for the brush and brush holder of the 40/50 HP chassis dynamo. | 5th Sep 1919 | West Wittering \ C \ September1919 Scan10 | |
| Mr. Royce's remarks and questions regarding the 'Smith cut-out' component. | 9th Sep 1919 | West Wittering \ C \ September1919 Scan11 | |
| With a sketch clarifying the design of a main switch brush standard, correcting a term in a previous memo. | 9th Sep 1919 | West Wittering \ C \ September1919 Scan12 | |
| Alterations to the 20 HP crankshaft due to crankcase changes. | 11th Sep 1919 | West Wittering \ C \ September1919 Scan13 | |
| Sending out schemes for a 20 HP engine, including details on the crankcase and oil pump. | 17th Sep 1919 | West Wittering \ C \ September1919 Scan14 | |
| Mr. Royce's wishes for modifications to the air pump delivery valve on chassis 49 GB. | 9th Sep 1919 | West Wittering \ C \ September1919 Scan15 | |
| Sending drawings for two types of oil indicator for the 20 HP engine, requesting experimental evaluation. | 22th Sep 1919 | West Wittering \ C \ September1919 Scan16 | |
| The oil pressure control valve for the 20 HP engine, referencing drawing No. Lec.1129. | 2nd Sep 1919 | West Wittering \ C \ September1919 Scan17 | |
| Investigation into the cause of distinct piston knocks in hot engines, including experiments on rod and piston alignment. | 20th Sep 1919 | West Wittering \ C \ September1919 Scan18 | |
| Satisfactory results from testing long pistons to address piston knocks. | 22th Sep 1919 | West Wittering \ C \ September1919 Scan19 | |
| The policy on giving official opinions about oils and a proposal to test samples from Vacuum Oil Co. | 25th Sep 1919 | West Wittering \ C \ September1919 Scan20 | |
| The proper running-in procedure for new and repaired chassis engines to ensure they run smoothly. | 24th Sep 1919 | West Wittering \ C \ September1919 Scan21 | |
| Noise from the air pump spindle on chassis 49 GB, with a proposed modification to the handle and cover. | 24th Sep 1919 | West Wittering \ C \ September1919 Scan22 | |
| Correspondence regarding the water temperature regulator for the 40/50 HP chassis, including drawing details and an order for 500 units. | 25th Sep 1919 | West Wittering \ C \ September1919 Scan23 | |
| Revisions to the 20 HP wheelcase drawing, including camshaft drive alterations. | 26th Sep 1919 | West Wittering \ C \ September1919 Scan24 | |
| Specification outlining modifications for a left-hand drive American chassis model. | 2nd Oct 1919 | West Wittering \ C \ September1919 Scan25 | |
| List of modifications and specifications for various vehicle components. | 1st Sep 1919 | West Wittering \ C \ September1919 Scan26 | |
| Series of alterations and specifications for various chassis components, likely for a left-hand drive conversion. | 1st Sep 1919 | West Wittering \ C \ September1919 Scan27 | |
| Offer for lubricating oil and the policy of using specific formulations over proprietary brands. | 12th Oct 1919 | West Wittering \ C \ September1919 Scan28 | |
| Suitability and recommendation of various engine oils, including Castrol and offerings from Price's and Vacuum Company. | 29th Sep 1919 | West Wittering \ C \ September1919 Scan29 | |
| Cancelling a previous instruction regarding the priming device on a 40/50 HP chassis and confirming the correct scheme to be followed. | 30th Sep 1919 | West Wittering \ C \ September1919 Scan30 | |
| The audibility of Klaxon horns and diaphragm breakages, recommending a spare be carried. | 9th Apr 1920 | West Wittering \ D \ April1920 Scan0 | |
| Experiments and specifications for a number of special ignition coils. | 13th Apr 1920 | West Wittering \ D \ April1920 Scan1 | |
| The testing and comparison of ignition coils, their performance, specifications, and fitting to a specific chassis. | 13th Apr 1920 | West Wittering \ D \ April1920 Scan2 | |
| The bench testing and analysis of various ignition coil designs, noting differences in insulation and secondary wire. | 13th Apr 1920 | West Wittering \ D \ April1920 Scan3 | |
| Further notes on the performance of standard coils and spark gap tests. | 16th Apr 1920 | West Wittering \ D \ April1920 Scan4 | |
| Graph showing maximum spark gap and average current versus contact breaker speed for various ignition coils. | 5th Mar 1930 | West Wittering \ D \ April1920 Scan5 | |
| Blank document stamped by the Print Room in Derby. | 10th Mar 1920 | West Wittering \ D \ April1920 Scan6 | |
| Graph of maximum gap-speed curves for five different special ignition coils. | 13th Apr 1920 | West Wittering \ D \ April1920 Scan7 | |
| Blank document page with a Print Room stamp from the Derby facility. | 15th Apr 1920 | West Wittering \ D \ April1920 Scan8 | |
| Graph showing the variation of maximum gap with the number of secondary turns for special battery ignition coils. | 13th Apr 1920 | West Wittering \ D \ April1920 Scan9 | |
| 10,000-mile test of a small Chloride battery type 6 BXE 4, which failed due to faulty manufacture. | 20th Apr 1920 | West Wittering \ D \ April1920 Scan10 | |
| Letter detailing the results and investigation following a 10,000-mile test on a 6 BXE4 Type Chloride Battery. | 20th Apr 1920 | West Wittering \ D \ April1920 Scan11 | |
| Letter detailing battery failure analysis, including issues with wooden separators and ebonite rings. | 6th Aug 1919 | West Wittering \ D \ April1920 Scan12 | |
| The conclusion of a letter discussing a fault but expressing overall confidence in battery performance. | 21th Apr 1920 | West Wittering \ D \ April1920 Scan13 | |
| Comments on a 10,000-mile test of various electrical components. | 21th Apr 1920 | West Wittering \ D \ April1920 Scan14 | |
| Report discussing coil winding specifications and the performance of a Lucas dynamo. | 21th Apr 1920 | West Wittering \ D \ April1920 Scan15 | |
| The performance of electrical parts after a 10,000-mile run on a 2.EX car. | 20th Apr 1920 | West Wittering \ D \ April1920 Scan16 | |
| Dynamo and wiring performance, with a recommendation to continue work on coils for an experimental car. | 20th Apr 1920 | West Wittering \ D \ April1920 Scan17 | |
| The flow of water through an engine with and without a thermostat fitted at various engine RPMs. | 24th Apr 1920 | West Wittering \ D \ April1920 Scan18 | |
| Design and manufacture of a switchboard for a Smith dynamo. | 1st Apr 1920 | West Wittering \ D \ April1920 Scan19 | |
| Requesting a new set of rear springs be made with specific design changes to prevent wear and squeaking. | 14th Apr 1920 | West Wittering \ D \ April1920 Scan20 | |
| Car accumulator construction and proposing an experiment to measure charge loss. | 14th Apr 1920 | West Wittering \ D \ April1920 Scan21 | |
| Changing the insulation material for a main switch from vulcasbestos to micanite. | 19th Apr 1920 | West Wittering \ D \ April1920 Scan22 | |
| Adoption of a rubber hose type joint for the thermostat water connections to improve fool-proofness. | 20th Apr 1920 | West Wittering \ D \ April1920 Scan23 | |
| The design for a luggage carrier bracket, criticising poor modifications by coachbuilders. | 19th Apr 1920 | West Wittering \ D \ April1920 Scan24 | |
| Manufacturing specifications for a magneto drive shaft. | 20th Apr 1920 | West Wittering \ D \ April1920 Scan25 | |
| Improvements to the starter motor's gearbox shaft and slipper drive, requesting testing and standardisation. | 19th Apr 1920 | West Wittering \ D \ April1920 Scan26 | |
| Effectiveness of a heat-insulated dashboard and the need for temperature measurement. | 23th Apr 1920 | West Wittering \ D \ April1920 Scan27 | |
| Effectiveness of a heat-insulated dashboard, with a handwritten note to take measurements. | 23th Apr 1930 | West Wittering \ D \ April1920 Scan28 | |
| Different designs and testing procedures for road springs. | 1st Apr 1920 | West Wittering \ D \ April1920 Scan29 | |
| Manufacturing defects in road springs, including improper bending and flatness. | 21th Apr 1920 | West Wittering \ D \ April1920 Scan30 | |
| Modifications to rear springs, proposing a second clip and a return to tapered ends. | 1st Apr 1920 | West Wittering \ D \ April1920 Scan31 | |
| Instructing alterations to 'Buzzard' connecting rods, referencing drawing LeC.1226. | 1st Apr 1920 | West Wittering \ D \ April1920 Scan32 | |
| Drawing for modifying the front chassis frames of 'Buzzard' and 'Vulture' bonnet models. | 24th Apr 1920 | West Wittering \ D \ April1920 Scan33 | |
| Postscript to a memo relaying Mr. Royce's concerns about frame strength and requesting a revised blueprint. | 1st Apr 1920 | West Wittering \ D \ April1920 Scan34 | |
| Inquiring about the desirability of using sherardised oil tubes for connecting rods. | 28th Apr 1920 | West Wittering \ D \ April1920 Scan35 | |
| The performance of the thermostat control for water temperature and a request for corrected drawings. | 23th Apr 1920 | West Wittering \ D \ April1920 Scan36 | |
| Material composition of 'Sparkite' contact points and considering alternatives like tungsten or silver. | 28th Apr 1920 | West Wittering \ D \ April1920 Scan37 | |
| Testing methods for pre-war car connecting rods and referencing aero engine practices. | 1st Apr 1920 | West Wittering \ D \ April1920 Scan38 | |
| Testing of 'ferodo' material for the bedding between leaves on road springs. | 28th Apr 1920 | West Wittering \ D \ April1920 Scan39 | |
| Risks and viability of fitting a smaller battery versus improving existing cells. | 28th Apr 1920 | West Wittering \ D \ April1920 Scan40 | |
| Mr. Royce's agreed modifications to Lucas dynamo terminals. | 29th Apr 1920 | West Wittering \ D \ April1920 Scan41 | |
| Chassis frame failure during a bump test and the proposed solution of using special washers. | 8th Dec 1919 | West Wittering \ D \ December1919 Scan0 | |
| Exceptions for the first American-built chassis, specifically regarding the adoption of a three-speed gearbox. | 6th Dec 1919 | West Wittering \ D \ December1919 Scan1 | |
| Design of a new electric starter and the lengthening of the chassis. | 6th Dec 1919 | West Wittering \ D \ December1919 Scan2 | |
| Listing parts ready for bulk production and those held for drawings, referencing a 2.5-inch frame extension. | 6th Dec 1919 | West Wittering \ D \ December1919 Scan3 | |
| Drawing No. Lec.1157 for a three-speed gearbox for an American chassis, requesting a blueprint be made. | 6th Dec 1919 | West Wittering \ D \ December1919 Scan4 | |
| Instructions for modifying the starter control mechanism on the American chassis to clear the rear exhaust box. | 9th Dec 1919 | West Wittering \ D \ December1919 Scan5 | |
| Experimental parts that have been fitted to specific chassis. | 10th Dec 1919 | West Wittering \ D \ December1919 Scan6 | |
| New single-wire electrical system and lamp holders for a car intended for a 10,000-mile run. | 12th Dec 1919 | West Wittering \ D \ December1919 Scan7 | |
| Modifications to the hand brake equalising shaft for the American chassis. | 15th Dec 1919 | West Wittering \ D \ December1919 Scan8 | |
| Testing standard and special Zephyr pistons, detailing issues with clearances, knocking, and seizures. | 16th Dec 1919 | West Wittering \ D \ December1919 Scan9 | |
| Mr. Royce's negative assessment of a peculiar Lodge porcelain sparking plug. | 2nd Dec 1919 | West Wittering \ D \ December1919 Scan10 | |
| The design, materials, and testing of a resistance for a motoring switch on an American chassis engine starter. | 16th Dec 1919 | West Wittering \ D \ December1919 Scan11 | |
| Request following Mr. Royce's wishes to test and report on motoring resistance Lec.1170 for an American chassis engine starter. | 17th Dec 1919 | West Wittering \ D \ December1919 Scan12 | |
| Internal request to test the resistance of a motoring switch and engine starter for an American chassis. | 19th Dec 1919 | West Wittering \ D \ December1919 Scan13 | |
| Telegram from Mr. Royce discussing the design and production of light cast iron pistons. | 19th Dec 1919 | West Wittering \ D \ December1919 Scan14 | |
| The design and testing instructions for a battery box suspension on a 40/50 HP chassis. | 23th Dec 1919 | West Wittering \ D \ December1919 Scan15 | |
| Page continuing instructions on how to remove a vehicle's battery from underneath the car. | 20th Dec 1919 | West Wittering \ D \ December1919 Scan16 | |
| Responding to queries on the 3/19 gearbox for the American chassis, covering the reverse pinion and universal pinion modifications. | 27th Dec 1919 | West Wittering \ D \ December1919 Scan17 | |
| Letter regarding queries on a gearbox, specifically the reverse pinion and a pinion for the universal joint. | 21th Dec 1913 | West Wittering \ D \ December1919 Scan18 | |
| Design and layout of an electrical starter switch for the 40/50 HP American Chassis. | 29th Dec 1919 | West Wittering \ D \ December1919 Scan19 | |
| The re-arranged cutting and main switches for the electrical starter on the 40/50 HP chassis. | 26th Dec 1918 | West Wittering \ D \ December1919 Scan20 | |
| Design alterations to the front end of the 3/19 gear box for the 40/50 HP American Chassis. | 24th Dec 1919 | West Wittering \ D \ December1919 Scan21 | |
| Design changes and further schemes for a gearbox assembly. | 24th Dec 1919 | West Wittering \ D \ December1919 Scan22 | |
| The testing of a silent slipper ram piston design. | 29th Dec 1919 | West Wittering \ D \ December1919 Scan23 | |
| Note about the design and lubrication of an AL Ram type slipper piston. | 24th Jun 1930 | West Wittering \ D \ December1919 Scan24 | |
| The difficulties of using Bentley-type pistons and outlining experiments with alternative piston designs. | 29th Dec 1919 | West Wittering \ D \ December1919 Scan25 | |
| Experiments with cast iron and plunger pistons, detailing issues and potential modifications. | 29th Dec 1919 | West Wittering \ D \ December1919 Scan26 | |
| List of new parts and modifications to be fitted to chassis 2.EX. | 29th Dec 1919 | West Wittering \ D \ December1919 Scan27 | |
| Correction to flywheel material specification and a note on tooth width for the American chassis starter. | 30th Dec 1919 | West Wittering \ D \ December1919 Scan28 | |
| Correcting the specified material and tooth dimensions for the flywheel starter on American chassis. | 8th Dec 1923 | West Wittering \ D \ December1919 Scan29 | |
| Unsatisfactory performance of a special 9/16 'V' type belt and recommending to continue with the standard Whittle belt. | 11th Dec 1919 | West Wittering \ D \ December1919 Scan30 | |
| Experiments to increase the power of the starting mechanism's actuator box for a parallel arrangement. | 23th Dec 1919 | West Wittering \ D \ December1919 Scan31 | |
| Comparison of standard and proposed parallel arrangements for an actuator box, including tables of amperage, turns, and load capacity. | 23th Dec 1919 | West Wittering \ D \ December1919 Scan32 | |
| | | | |
