| Description | Date | Identifier | |
| Temporary modification to a pump switch to prevent tracking. | 20th Apr 1937 | Box 168a \ 2 img295 | |
| Dispatch of 230 Petrol Pump Switches to Messrs. Lucas for modification. | 21th Apr 1937 | Box 168a \ 2 img296 | |
| Production specification and test for a right-hand headlamp foot switch to DB.1121. | 21th Apr 1937 | Box 168a \ 2 img297 | |
| Inspection, adjustment, and test specification for a foot-operated headlamp switch, part number DB.1121. | 21th Apr 1937 | Box 168a \ 2 img298 | |
| Dispatch of a modified petrol pump switch and the return of the old one. | 22th Apr 1937 | Box 168a \ 2 img299 | |
| Simplified design and manufacturing of the Wraith III main switch. | 22th Apr 1937 | Box 168a \ 2 img300 | |
| Confirming a modified petrol pump switch has been fitted and the old one is being returned. | 23th Apr 1937 | Box 168a \ 2 img301 | |
| Issues with a petrol pump switch, its recall, and potential replacement. | 23th Apr 1937 | Box 168a \ 2 img302 | |
| The immediate recall and replacement of faulty switches to prevent petrol pump issues. | 21th Apr 1937 | Box 168a \ 2 img303 | |
| Cost comparison of petrol pump switches and foot switches from supplier Lucas versus a proposed new design. | 9th Mar 1937 | Box 168a \ 2 img304 | |
| Attaching a blueprint of RR.Sch.1077 for the Wraith III Main Switch. | 26th Apr 1937 | Box 168a \ 2 img305 | |
| Request for a drawing or sample of a petrol pump switch for examination before a decision is made. | 10th May 1937 | Box 168a \ 2 img306 | |
| Letter to The Motor Roof Lamp Co. regarding a fault with push-pull switches where the knobs work loose. | 12th Apr 1937 | Box 168a \ 2 img307 | |
| Follow-up letter to The Motor Roof Lamps Co. regarding a previous unanswered communication. | 26th Apr 1937 | Box 168a \ 2 img308 | |
| Request to replace a burnt-out flexible contact lead on a changeover switch. | 26th Apr 1937 | Box 168a \ 2 img309 | |
| Failure of a redesigned starter switch during endurance testing. | 4th May 1931 | Box 168a \ 2 img311 | |
| Request to despatch a failed Lucas Dimmer switch to Messrs. Lucas for inspection. | 5th May 1937 | Box 168a \ 2 img312 | |
| New Phantom III Starter Switch design, its performance, and reduced manufacturing costs. | 16th Apr 1937 | Box 168a \ 2 img313 | |
| Sending an improved, cheaper Phantom III Starter Motor Switch for testing and requesting a decision. | 20th Apr 1937 | Box 168a \ 2 img314 | |
| Faulty Bentley indicator switch and an enclosed translation regarding Delco Remy distributors. | 4th May 1937 | Box 168a \ 2 img315 | |
| Extract from a guide on troubleshooting roadside issues, specifically focusing on the contact breaker. | 8th May 1937 | Box 168a \ 2 img316 | |
| Offering criticisms on the simplified Wraith III main switch to make it more economical to assemble. | 8th May 1937 | Box 168a \ 2 img317 | |
| Sample petrol pump switch for the 'Phantom III' Chassis received from Messrs. J. Lucas, sent for testing. | 21th May 1937 | Box 168a \ 2 img318 | |
| Faulty Lucas Horns Relay Switch being sent to the makers for examination. | 31th May 1937 | Box 168a \ 2 img319 | |
| New switch for checking petrol pumps, which has been sent for testing. | 24th May 1937 | Box 168a \ 2 img320 | |
| Test report and design critique of a new petrol pump switch from Messrs. Lucas which failed endurance testing. | 26th May 1937 | Box 168a \ 2 img321 | |
| Comparing the price of a Lucas two-way switch with a proprietary switch for petrol pumps, recommending the latter. | 5th May 1937 | Box 168a \ 2 img322 | |
| Modifications, testing, and design feedback for a revised petrol pump switch. | 9th Jun 1937 | Box 168a \ 2 img323 | |
| Returning a failed petrol pump switch for inspection. | 26th May 1937 | Box 168a \ 2 img324 | |
| Proposed modifications to the Wraith III Main Switch, RR.Sch.1077. | 1st Jun 1937 | Box 168a \ 2 img325 | |
| The dispatch of a dismantled Lucas Foot Switch for examination and report. | 3rd Jun 1937 | Box 168a \ 2 img326 | |
| Requesting the despatch of a Lucas footswitch to Messrs Lucas for examination and report. | 4th Jun 1937 | Box 168a \ 2 img327 | |
| Proposed Lucas fuse board and suggesting a new arrangement with six fuses, including a modification to the switchbox. | 18th Jun 1937 | Box 168a \ 2 img328 | |
| Diagram of a fuse board with a proposed new Lucas design incorporating 6 fuses. | 18th Jun 1937 | Box 168a \ 2 img329 | |
| Wiring diagram blueprint showing connections from a switch box to various vehicle electrical components. | 9th Jun 1931 | Box 168a \ 2 img330 | |
| Obsolete petrol pump switch on chassis 3-B-IV, requesting a new Lucas switch be fitted. | 9th Jun 1931 | Box 168a \ 2 img331 | |
| Results of bench tests on a modified Phantom III Starter Push button Switch. | 23th Dec 1937 | Box 168a \ 2 img332 | |
| Request to replace a faulty Lucas foot switch on chassis 27.G.VI with a standard footswitch. | 20th Dec 1937 | Box 168a \ 2 img333 | |
| Faulty Lucas foot switch on chassis 27.G.VI and the request to fit a standard replacement. | 20th Dec 1937 | Box 168a \ 2 img334 | |
| Letter to Joseph Lucas & Co. Ltd. regarding a foot-switch failure on a Phantom III chassis. | 13th Jul 1937 | Box 168a \ 2 img335 | |
| Letter from Joseph Lucas Limited regarding a foot switch fault causing a 'black-out' on a Phantom III chassis. | 14th Jul 1937 | Box 168a \ 2 img336 | |
| The electrical failure of a new petrol pump switch during testing, leading to its disapproval. | 17th Jun 1937 | Box 168a \ 2 img337 | |
| Material change for main switch armatures from Duralumin to mild steel due to supply difficulties. | 22th Jun 1937 | Box 168a \ 2 img338 | |
| Substitution of a Duralumin armature with a mild steel one for the Main Switch Sec.8160. | 24th Jun 1937 | Box 168a \ 2 img339 | |
| Request to arrange for a set of cables to be made for a Lucas Universal Footswitch wiring. | 5th Jul 1937 | Box 168a \ 2 img340 | |
| Modifications for a Lucas type FS.22/N Headlamp Footswitch for R.R. & Bentley Chassis. | 6th Jul 1937 | Box 168a \ 2 img341 | |
| Recommendation to substitute a mild steel armature for a Duralumin one in the Starter Motor Main Switch due to supply issues. | 9th Jul 1937 | Box 168a \ 2 img342 | |
| The testing of a modified 'Phantom III' petrol pump switch. | 9th Jul 1937 | Box 168a \ 2 img343 | |
| Request for a replacement Lucas footswitch for a Phantom III due to a fault causing a lamp to black out. | 9th Jul 1937 | Box 168a \ 2 img344 | |
| Arranging the air dispatch of a footswitch and a petrol pump needle valve to Mr. I. M. Waller in France for testing. | 10th Jul 1937 | Box 168a \ 2 img345 | |
| The dimmer switch for instrument lights on the Phantom III 35-EX, noting it was a good feature missed in a recent report. | 17th Jul 1937 | Box 168a \ 2 img346 | |
| Modification to the starter switch for the Phantom III and 25/30 models, to be detailed for experimental issue. | 25th Aug 1937 | Box 168a \ 2 img347 | |
| Lucas footswitch for a 32-EX Phantom III, noting an intermittent fault has resolved itself. | 13th Jul 1937 | Box 168a \ 2 img348 | |
| Endurance test report on a starter motor relay switch designed by HPS/TT. | 25th Aug 1937 | Box 168a \ 2 img349 | |
| Recommendation for using a Tungsten-Copper alloy (Elmet) for switch contacts. | 2nd Jul 1937 | Box 168a \ 2 img350 | |
| Requirement for a flexible rubber sealing diaphragm for the new type Lucas Footswitch on the Phantom III. | 2nd Jul 1937 | Box 168a \ 2 img351 | |
| Endurance test report on the Phantom III Starter Motor Push Button Switch. | 16th Jun 1937 | Box 168a \ 2 img352 | |
| Requesting a covering order for Lucas dimmer switches to be booked to specific order numbers. | 18th Aug 1937 | Box 168a \ 2 img353 | |
| Preparation of a Phantom III Foot Switch and a request for the chassis details for fitting. | 8th Sep 1937 | Box 168a \ 2 img354 | |
| The failure of a Phantom III push button switch, recommending a modification to the pigtail connection. | 10th Sep 1937 | Box 168a \ 2 img355 | |
| Request to replace the existing dipper switch on chassis 36-FX with a modified version, No. D.38. | 10th Sep 1937 | Box 168a \ 2 img356 | |
| Investigation into a modification for the Phantom III push button switch to address the breakage of the carbon contact pigtail. | 20th Sep 1937 | Box 168a \ 2 img357 | |
| Endurance test report on a Phantom III starter motor push button switch. | 21th Sep 1937 | Box 168a \ 2 img358 | |
| Hand-made sample of a petrol pump switch from Lucas for testing on the Phantom III. | 24th Sep 1937 | Box 168a \ 2 img359 | |
| News release from International Technical Developments Ltd. about the H-C Vapour-Proof Switch. | 1st Oct 1937 | Box 168a \ 2 img360 | |
| News release detailing the construction and electrical data for various types of switches. | 1st Dec 1937 | Box 168a \ 2 img361 | |
| Product leaflet for the H.C. Vapour-proof Precision Switch, detailing its components and different types. | 1st Oct 1937 | Box 168a \ 2 img362 | |
| Provisional price list for the H.C. Vapour-Proof Precision Switch. | 1st Oct 1937 | Box 168a \ 2 img363 | |
| Test report on the Lucas 'Four Way' Petrol Pump Switch. | 14th Oct 1937 | Box 168a \ 2 img364 | |
| Advice note from Joseph Lucas Limited regarding a dimmer switch for a Bentley chassis and a dimming switch sample. | 17th Jan 1938 | Box 168a \ 2 img365 | |
| Endurance test report for a Lucas ST.900 Starter Motor relay switch No. 760151. | 26th Jan 1938 | Box 168a \ 2 img366 | |
| Lucas starter motor switch, comparing its weight and post-test condition, with a recommendation for its use on the Bentley chassis. | 26th Jan 1938 | Box 168a \ 2 img367 | |
| Requesting hand-made samples of a changeover switch for trial and standardisation. | 10th Mar 1938 | Box 168a \ 2 img368 | |
| Standardization of Lucas R.100 headlamps for English and Continental use on Phantom III, Wraith, and Bentley models. | 9th Mar 1938 | Box 168a \ 2 img369 | |
| Promise to provide a reverse light switch for the Wraith model. | 10th Mar 1938 | Box 168a \ 2 img370 | |
| Instruction to delete a flange and rubber washer on the Wraith III chassis, enabling the use of a standard 25/30 HP type footswitch. | 4th Mar 1938 | Box 168a \ 2 img371 | |
| Parts and materials list for a Magnet Coil and Core for Starter Switch SEC.8060. | 11th Mar 1938 | Box 168a \ 2 img372 | |
| Instructions for making a coil and core and fitting it to an existing switch for testing. | 11th Mar 1938 | Box 168a \ 2 img373 | |
| Order request to J. Lucas Ltd. for a pair of R.100 headlamps for trial and potential standardisation. | 14th Mar 1938 | Box 168a \ 2 img374 | |
| New moulded button for a 2-tone horn switch, addressing rattle issues and requesting it be issued for experiment. | 18th Mar 1938 | Box 168a \ 2 img375 | |
| Instructions for producing a moulded top horn button for the Wraith and Bentley III models to eliminate rattles. | 28th Mar 1938 | Box 168a \ 2 img376 | |
| Using the Phantom III 2-tone horn switch on the Wraith model, requiring a new quadrant casting. | 7th Apr 1938 | Box 168a \ 2 img377 | |
| Endurance test report for a main switch, comparing the DCD.123 model with two others. | 11th Apr 1938 | Box 168a \ 2 img378 | |
| Comparison and recommendation of a Lucas switch against a potential in-house design for Bentley cars. | 10th Jun 1938 | Box 168a \ 2 img379 | |
| The development of starter main switches, including the production of a new solenoid type. | 10th Jun 1938 | Box 168a \ 2 img380 | |
| Broken return spring on a standard footswitch during an endurance test. | 11th Jun 1938 | Box 168a \ 2 img381 | |
| Reporting the failure of a footswitch under endurance testing due to a collapsed 'Tufnol' roller. | 24th Jun 1938 | Box 168a \ 2 img382 | |
| Test report on Lucas petrol pump switches detailing failures and recommendations. | 19th Jul 1938 | Box 168a \ 2 img383 | |
| The parts for a Starter Main Switch for all chassis. | 17th Aug 1938 | Box 168a \ 2 img384 | |
| Parts list for a starter and main switch, with additional parts for testing purposes and fitting instructions. | 1st Sep 1938 | Box 168a \ 2 img385 | |
| Letter from Jens A. B. Jacobsen offering new Wing Indicator Time Switches for motor cars. | 1st Sep 1938 | Box 168a \ 2 img386 | |
| Blank or unreadable black page with binder holes on the left. | 15th Sep 1938 | Box 168a \ 2 img387 | |
| Letter confirming the dispatch of a sample Direction Indicator Time Switch. | 15th Sep 1938 | Box 168a \ 2 img388 | |
| Presenting a revised and simplified design for controlling switches for lights, ignition, and starting. | 19th Sep 1938 | Box 168a \ 2 img389 | |
| The design and wiring of a switchbox, its associated components, and dynamo circuit. | 19th Sep 1938 | Box 168a \ 2 img390 | |
| The adoption of a superior and cheaper foot switch from a specialist (Lucas) rather than re-designing their own. | 19th Sep 1938 | Box 168a \ 2 img391 | |
| Endurance tests conducted on three types of footswitches. | 9th Sep 1930 | Box 168a \ 2 img392 | |
| Failure report comparing three different dipper switches by cause of failure and number of operations. | 20th Sep 1938 | Box 168a \ 2 img393 | |
| The testing of a Lucas Ignition Switch, Type No. M & N - 30. | 20th Sep 1936 | Box 168a \ 2 img394 | |
| Table of volt drop readings at different operational cycles and amperage levels. | 20th Sep 1938 | Box 168a \ 2 img395 | |
| | | | |
