| Description | Date | Identifier | |
| Weak and bending armature carbon contact on an electro-magnetic main switch, proposing a stiffer replacement for experimental testing. | 26th Jan 1933 | Box 168a \ 2 img093 | |
| Standardisation of a sequence starter switch by deleting the relay portion to simplify and reduce cost. | 17th Aug 1932 | Box 168a \ 2 img094 | |
| Chassis series for a new part, its test date, and associated material or tool costs. | 26th Nov 1932 | Box 168a \ 2 img095 | |
| Redesign of a car's master electrical switch and its functions. | 1st Mar 1933 | Box 168a \ 2 img096 | |
| Design and proposed functionality of a multi-position electrical switch. | 14th Mar 1933 | Box 168a \ 2 img097 | |
| Design and functionality of a multi-position electrical switch, comparing a drum-type design to existing contacts. | 14th Mar 1933 | Box 168a \ 2 img098 | |
| Diagram of a three-posted component made of brass or extruded metal, featuring a spring-loaded regulation screw and connections for lamps. | 15th Mar 1933 | Box 168a \ 2 img099 | |
| Retrofitting a magnetic main switch to car 18.G.4 due to the existing starter switch being activated by engine movement. | 15th Mar 1933 | Box 168a \ 2 img100 | |
| Request to arrange a starter motor main switch with coil and resistance windings to specific drawings. | 15th Mar 1934 | Box 168a \ 2 img101 | |
| Design of fool-proof and reliable electrical switches for ignition and lighting. | 4th Apr 1911 | Box 168a \ 2 img102 | |
| Separation of the ignition and lighting switches and the ongoing design of the switchbox. | 5th Apr 1933 | Box 168a \ 2 img103 | |
| Requesting a covering order for a sample dipper switch from Messrs. Lucas. | 21th Apr 1933 | Box 168a \ 2 img104 | |
| Request to make two push button switches for Beshfort chassis models 3.BIV and 4BIV to drawing D.100250. | 25th Apr 1933 | Box 168a \ 2 img105 | |
| Stop lamp switch failure on a Bensport chassis which nearly resulted in a fire. | 2nd Jun 1933 | Box 168a \ 2 img106 | |
| Arranging the re-design of stop lamp switches with the makers, Butlers Ltd. | 7th Jun 1933 | Box 168a \ 2 img107 | |
| Letter to supplier Messrs. Butler & Co. Ltd. regarding a failure of their Stop Lamp Switches which nearly caused a fire on a new chassis. | 9th Jun 1933 | Box 168a \ 2 img108 | |
| Letter from Butlers Limited confirming a visit to discuss 'Tail Lamp Switches'. | 20th Jun 1930 | Box 168a \ 2 img109 | |
| Correct wiring for Butlers stop lamps, referencing a failure on a Green Bentley and subsequent modifications. | 21th Oct 1935 | Box 168a \ 2 img110 | |
| Recommendation for the switch position on Butlers' stop lamps. | 22th Jun 1933 | Box 168a \ 2 img111 | |
| Covering memo regarding Butlers' Stop Lamps. | 23th Jun 1933 | Box 168a \ 2 img112 | |
| The replacement of Bensport stop lamp switches on a Green Bentley following a short-circuit. | 24th Jun 1933 | Box 168a \ 2 img113 | |
| Alterations to Butler's stop lamps and the associated wiring. | 26th Jun 1933 | Box 168a \ 2 img114 | |
| Wiring and design for Butler stop lamps and a new switch. | 3rd Jul 1933 | Box 168a \ 2 img115 | |
| The failure of Butlers stop lamp switches on chassis 18.G.4. | 5th Jul 1933 | Box 168a \ 2 img116 | |
| Request to despatch a replacement Butler stop lamp switch which failed on a test chassis. | 5th Jul 1933 | Box 168a \ 2 img117 | |
| Confirming a no-charge repair for a returned Butler Stop Lamp Switch. | 21th Jul 1933 | Box 168a \ 2 img118 | |
| Internal request to order two double pole, double throw knife switches from the Sun Electrical Co. | 20th Sep 1933 | Box 168a \ 2 img119 | |
| Order for a brake switch from Scintilla Co. Ltd. | 13th Oct 1933 | Box 168a \ 2 img120 | |
| Requesting a further test on a finer gauge coil for an electro-magnetic main starter switch. | 15th Nov 1933 | Box 168a \ 2 img121 | |
| Standardisation of parts document for a stop lamp switch. | 20th Dec 1933 | Box 168a \ 2 img122 | |
| The bench endurance test of a new design brake stop lamp switch, detailing a failure and suggesting improvements. | 4th Jan 1934 | Box 168a \ 2 img123 | |
| Request to fit a Bosch foot switch in place of a Lucas type on car 20-EX as the latter fouls the clutch cover. | 20th Feb 1934 | Box 168a \ 2 img124 | |
| Improvements and testing of the R.R. Brake Stop Lamp Switch. | 15th Mar 1934 | Box 168a \ 2 img125 | |
| Illegible document with no visible text due to poor image quality. | 6th Mar 1934 | Box 168a \ 2 img126 | |
| Standardisation of parts document for a Stop Lamp Switch. | 6th Mar 1934 | Box 168a \ 2 img127 | |
| Urgent request for a Bosch Foot Switch for fitting to an experimental Bentley chassis. | 4th May 1934 | Box 168a \ 2 img128 | |
| Confirming the dispatch of a Bosch foot switch. | 7th May 1934 | Box 168a \ 2 img129 | |
| Of goods forwarded detailing a Bosch change-over switch for an experimental Bentley. | 7th May 1934 | Box 168a \ 2 img130 | |
| Internal order request for two single-pole knife switches from Sun Electrical Co. | 18th May 1934 | Box 168a \ 2 img131 | |
| Request to arrange for a Bosch foot switch to be fitted to a new Bentley Chassis 5.B.IV. | 20th Jun 1934 | Box 168a \ 2 img132 | |
| Foot control switch, originally made by Bosch and subsequently developed by Joseph Lucas Ltd. | 14th Jul 1934 | Box 168a \ 2 img133 | |
| Request to remove a starter switch from scheme 18.G.4 for examination and replace it with a standard switch. | 18th Jul 1934 | Box 168a \ 2 img134 | |
| Instruction to fit a double ignition coil arrangement to Bentley chassis 1.B.IV. | 20th Jul 1934 | Box 168a \ 2 img135 | |
| Standardisation of a starter motor main switch with finer gauge coil windings. | 6th Jun 1934 | Box 168a \ 2 img136 | |
| Unreadable, heavily degraded document page with two punch holes on the left. | 28th Jun 1934 | Box 168a \ 2 img137 | |
| Standardisation of a starter motor main switch with finer gauge coil windings D.74174/5. | 28th Jun 1934 | Box 168a \ 2 img138 | |
| Test report on Lucas headlamp dip switches, type FS12. | 30th Jul 1934 | Box 168a \ 2 img139 | |
| The design and testing of a new headlamp foot switch. | 3rd Aug 1934 | Box 168a \ 2 img140 | |
| Report page on testing a switch's making and breaking capacity, with suggestions to modify the cam lobes for improved performance. | 8th Mar 1934 | Box 168a \ 2 img141 | |
| Request for six push-pull type Instrument Board Switches, with three required for model 30-EX and the rest as spares. | 23th Aug 1934 | Box 168a \ 2 img142 | |
| Proposal for a new design of an electro-magnetic starter switch, intended to be more efficient and cheaper. | 10th Oct 1934 | Box 168a \ 2 img143 | |
| Request for two sets of small parts to be made for an experimental dash light switch, from detail drawing EL32-40. | 4th Oct 1934 | Box 168a \ 2 img144 | |
| Proposal for an Electro Magnetic Starter Switch and suggesting design improvements. | 16th Oct 1934 | Box 168a \ 2 img145 | |
| Request to manufacture and assemble components for an Aero Battery Ignition Relay Switch for flight tests. | 29th Nov 1934 | Box 168a \ 2 img146 | |
| Request to standardize the foot switch and fit another to car 5.B.IV for a 10,000-mile test. | 1st Jan 1935 | Box 168a \ 2 img147 | |
| Letter to Currus Ltd discussing the suitability of different switches for dashboard mounting. | 10th Jan 1935 | Box 168a \ 2 img148 | |
| Service instruction regarding the testing and recalibration of oil pressure gauges. | 18th Feb 1937 | Box 168a \ 2 img149 | |
| Necessary parts for mounting a foot switch on a metal floor for a Bentley 3 & R.IV. | 15th Jan 1935 | Box 168a \ 2 img150 | |
| Request for a R.R. Foot Switch to LOP.DB695 for bench testing. | 7th Mar 1935 | Box 168a \ 2 img151 | |
| Recommending drilling ventilation holes in the starter main switch to prevent corrosion. | 17th Apr 1935 | Box 168a \ 2 img152 | |
| Specification for the production inspection and testing of the starter main switch unit. | 17th Apr 1935 | Box 168a \ 2 img153 | |
| Test procedures for checking various gaps and performing electrical tests on a switch. | 17th Apr 1935 | Box 168a \ 2 img154 | |
| Test procedures for an electrical switch, specifying contact pressure and voltage tolerance. | 17th Apr 1935 | Box 168a \ 2 img155 | |
| The gap tables for a main switch unit. | 20th May 1935 | Box 168a \ 2 img156 | |
| Letter to Rotax Ltd. requesting particulars of solenoid relay starter and button switches for a new N.A.3.W motor. | 20th May 1935 | Box 168a \ 2 img157 | |
| Letter from Rotax Limited regarding prints and pricing for a Solenoid Switch and a Push Button Switch. | 23th May 1935 | Box 168a \ 2 img158 | |
| Trial for a silent zone switch, which transfers the horn's operation to the headlamps. | 9th Jul 1935 | Box 168a \ 2 img159 | |
| Request to order Rotax aero solenoid and push button starter switches. | 12th Aug 1935 | Box 168a \ 2 img160 | |
| Request for six instrument board switches for fog lamp, windscreen wiper, and headlamp dip control. | 20th Aug 1935 | Box 168a \ 2 img161 | |
| Request to despatch an ignition relay switch to R.A.E. Farnborough on loan. | 20th Aug 1935 | Box 168a \ 2 img162 | |
| Letter regarding a sample aero battery ignition relay switch sent for radio interference testing. | 20th Aug 1935 | Box 168a \ 2 img163 | |
| Correspondence regarding the supply of engraved switches for fog lamps, windscreen wipers, and headlamp dip control. | 21th Aug 1935 | Box 168a \ 2 img164 | |
| Letter from a coachbuilder regarding the supply of instrument board switches. | 21th Aug 1935 | Box 168a \ 2 img165 | |
| Letter from the Royal Aircraft Establishment regarding a Coil Ignition Scheme and Relay Switch test sample. | 28th Aug 1935 | Box 168a \ 2 img166 | |
| Unsatisfactory material (Ubas instead of Swedish Iron) for an Ignition Relay Switch iron core. | 10th Sep 1935 | Box 168a \ 2 img167 | |
| Dispatch request for an electric starter push button switch for a Merlin engine to be sent to Hawkers, Brooklands. | 18th Sep 1935 | Box 168a \ 2 img168 | |
| Letter to Hawkers Engineering Co. Ltd. regarding the exchange of a push button switch for a Merlin engine electric starter. | 18th Sep 1935 | Box 168a \ 2 img169 | |
| Request for two new windings for an Aero Battery Ignition Relay Switch with updated specifications. | 19th Sep 1935 | Box 168a \ 2 img170 | |
| Requesting the exchange of two Rotax push button switches for a different type with a recessed button. | 2nd Oct 1935 | Box 168a \ 2 img171 | |
| Covering letter for the specification of production inspection and test for the new R.R. headlamp foot switch. | 2nd Oct 1935 | Box 168a \ 2 img172 | |
| Specification for the inspection, adjustment, and testing of a foot-operated headlamp switch. | 2nd Oct 1935 | Box 168a \ 2 img173 | |
| Decision to sell the R.R. Headlamp Dipper Foot Switch as an optional extra for the 20/25 HP model. | 9th Oct 1935 | Box 168a \ 2 img174 | |
| Production of a Swedish iron core for an experimental aero relay switch. | 12th Oct 1935 | Box 168a \ 2 img175 | |
| Sourcing of a Bosch Foot Switch for Bentley Chassis from Stuttgart and the testing of an alternative R-R. Foot Switch. | 15th Oct 1935 | Box 168a \ 2 img176 | |
| The introduction of an RR footswitch on the 'G' series Bentley chassis, replacing the Bosch switch. | 16th Oct 1935 | Box 168a \ 2 img177 | |
| Letter chasing the Royal Aircraft Establishment about testing a sample relay switch for a coil ignition scheme. | 17th Oct 1935 | Box 168a \ 2 img178 | |
| Letter from the Royal Aircraft Establishment regarding a Coil Ignition System relay switch. | 11th Oct 1935 | Box 168a \ 2 img179 | |
| Letter to the Royal Aircraft Establishment rescheduling a visit for a demonstration of an experimental coil-ignition relay switch. | 21th Oct 1935 | Box 168a \ 2 img180 | |
| Letter from the Royal Aircraft Establishment confirming a rescheduled visit for Mr. West. | 24th Oct 1935 | Box 168a \ 2 img181 | |
| Design improvements and material issues for an Aero Battery Ignition Automatic Relay Switch. | 25th Oct 1935 | Box 168a \ 2 img182 | |
| Letter to the Royal Aircraft Establishment regarding the redesign of an ignition relay switch to avoid radio interference. | 4th Nov 1935 | Box 168a \ 2 img183 | |
| Radio interference from an ignition relay switch and a proposed redesigned layout. | 4th Nov 1935 | Box 168a \ 2 img184 | |
| Relay Switch sent to Messrs. J. Lucas Limited for repairs and modification. | 13th Nov 1935 | Box 168a \ 2 img185 | |
| Letter to De Havilland Aircraft Co. Ltd. inquiring about the necessity of a battery master switch. | 13th Nov 1935 | Box 168a \ 2 img186 | |
| Letter to Imperial Airways Ltd. about the necessity of using a battery master switch on their machines. | 13th Nov 1935 | Box 168a \ 2 img187 | |
| Letter from De Havilland's Chief Designer regarding the potential future necessity of a battery master switch on aircraft. | 15th Nov 1935 | Box 168a \ 2 img188 | |
| Attached diagrams for booster coil clips and the position of the booster coil and relay switch for a Horsley Aircraft. | 18th Nov 1935 | Box 168a \ 2 img189 | |
| Letter from Rotax Limited regarding master battery switches and associated outline drawings for civil aircraft. | 18th Nov 1935 | Box 168a \ 2 img190 | |
| Letter to Messrs. Rotax Ltd. regarding a requested modification to a push button switch for electric starters. | 13th Sep 1935 | Box 168a \ 2 img191 | |
| Letter from British Thomson-Houston Company regarding a proposed solenoid switch design and drawing CX.70588. | 18th Nov 1935 | Box 168a \ 2 img192 | |
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