| Description | Date | Identifier | |
| Test report on a modified instrument board dimmer switch unit, detailing resistance, temperature, and noise improvements. | 11th Dec 1936 | Box 168a \ 1 img061 | |
| Outlining the proposed grouped instrument panel scheme for the Phantom III and Wraith models. | 17th Dec 1936 | Box 168a \ 1 img062 | |
| Proposal for the layout and illumination of dashboard switches and instruments. | 12th Jan 1937 | Box 168a \ 1 img063 | |
| Proposal for the Phantom III instrument board to use 3.5 volt bulbs in series to achieve financial savings. | 12th Jan 1937 | Box 168a \ 1 img064 | |
| Recurring failure of the push-pull switch knob on car 35-EX. | 13th Jan 1937 | Box 168a \ 1 img065 | |
| Complaints of knobs coming off push-pull switches on instrument boards. | 14th Jan 1937 | Box 168a \ 1 img066 | |
| The sourcing and potential defects of push-pull switches. | 15th Jan 1927 | Box 168a \ 1 img067 | |
| Instruction to build and fit lampholders for the Phantom III instrument light on Chassis 36 EX. | 15th Feb 1937 | Box 168a \ 1 img068 | |
| Parts request for a mock-up of an instrument patch and a revised switchbox. | 16th Feb 1937 | Box 168a \ 1 img069 | |
| List of standard parts, 'K' parts, and parts for a switchbox, including part numbers and quantities. | 16th Feb 1937 | Box 168a \ 1 img070 | |
| List of parts for a switchbox and instrument illumination bulbs. | 16th Feb 1937 | Box 168a \ 1 img071 | |
| List of new, standard, and stock parts required to incorporate a Dimmer Switch on the Wraith III instrument board. | 8th Apr 1937 | Box 168a \ 1 img072 | |
| List of parts required for a modification to use 3.5 volt bulbs in series for lampholders. | 8th Apr 1937 | Box 168a \ 1 img073 | |
| Query to confirm that the instrument board dimmer/switch unit and electric clock are by-passed from the master switch. | 9th Apr 1937 | Box 168a \ 1 img074 | |
| Internal instruction memo to Mr. Bradly to arrange for a mount to be made for a special instrument patch. | 16th Apr 1937 | Box 168a \ 1 img075 | |
| Requesting the return of a sample instrument board after visual inspection and sales feedback. | 24th Apr 1937 | Box 168a \ 1 img076 | |
| Requesting an experimental instrument board be sent to Major Cox for inspection. | 24th Apr 1937 | Box 168a \ 1 img077 | |
| The required resistance to reduce voltage for instrument lamps in a Ph.XII arrangement. | 29th Apr 1937 | Box 168a \ 1 img078 | |
| Notification regarding the despatch of chassis GLN - 83 by rail, along with a specific instrument board. | 5th May 1937 | Box 168a \ 1 img079 | |
| The design and approval process for a New Type P.3. Instrument Board. | 5th May 1937 | Box 168a \ 1 img080 | |
| Critique of a proposed instrument board design for the Phantom III, suggesting improvements for a more balanced layout. | 4th May 1937 | Box 168a \ 1 img081 | |
| Feedback on a proposed instrument board design for the Phantom III, critiquing its American-style aesthetics and suggesting layout improvements. | 4th May 1937 | Box 168a \ 1 img082 | |
| Confirmation to proceed with a modified instrument board design based on the Phantom, with specific additions for Bentley models. | 19th Jun 1937 | Box 168a \ 1 img083 | |
| Dropping the scheme for concave dials on Bentley instruments. | 19th May 1937 | Box 168a \ 1 img084 | |
| Proposed new Bentley instrument board and the introduction of a separate revolution counter. | 28th May 1937 | Box 168a \ 1 img085 | |
| New revolution counter with concave dials and lighting for the Bentley and Phantom III instrument panels. | 5th Jun 1937 | Box 168a \ 1 img086 | |
| The development of instrument lighting for the Bentley III model. | 1st Jun 1937 | Box 168a \ 1 img087 | |
| The use of 3.5 volt instrument board lamps and the requirement for road testing before standardisation. | 11th Jun 1937 | Box 168a \ 1 img088 | |
| Illumination design for a Bentley tachometer instrument patch. | 28th Jun 1937 | Box 168a \ 1 img089 | |
| Instruction memo listing required quantities of various parts. | 28th Jun 1937 | Box 168a \ 1 img090 | |
| Proposal to use 3.5-volt bulbs for the Instrument Patch on 25/30 HP & Phantom III Chassis to make economies. | 1st Jul 1937 | Box 168a \ 1 img091 | |
| Blueprints and a list of parts for the Instrument Patch on 25/30 HP & 'Phantom III' models. | 2nd Jul 1937 | Box 168a \ 1 img092 | |
| Questioning the omission of the dimmer switch feature from a report on the Phantom III in France. | 17th Jul 1937 | Box 168a \ 1 img093 | |
| Dispatch of a special Bentley instrument board to Major Cox for inspection. | 10th Aug 1937 | Box 168a \ 1 img094 | |
| Modification to the Bentley Instrument Board lighting, listing the necessary new parts. | 25th Aug 1937 | Box 168a \ 1 img095 | |
| New conductors required for the wiring and fittings of a new instrument board. | 13th Sep 1937 | Box 168a \ 1 img096 | |
| Parts required for the new Bentley Instrument Board, including modified Phantom III components. | 13th Sep 1937 | Box 168a \ 1 img097 | |
| Request to obtain an A.C. Speedometer and Rev. Counter for a Bentley instrument board. | 15th Oct 1937 | Box 168a \ 1 img098 | |
| Request to build one instrument board for a Phantom III chassis 39-KX, including a list of required parts. | 15th Oct 1937 | Box 168a \ 1 img099 | |
| Listing electrical components and their quantities, with a note on ordering additional materials. | 15th Oct 1937 | Box 168a \ 1 img100 | |
| Alternative manufacturing methods for instrument board components on the Wraith model. | 16th Nov 1937 | Box 168a \ 1 img101 | |
| Use of a combined instrument board on a Bentley. | 10th Dec 1937 | Box 168a \ 1 img102 | |
| Blueprint for a new instrument board for a Bentley 3.B.IV model. | 13th Apr 1938 | Box 168a \ 1 img103 | |
| Instruction regarding the fitting of a new instrument board and its associated parts. | 22th Apr 1938 | Box 168a \ 1 img104 | |
| Specification for the instrument board of the Bentley 50 (1st car), detailing differences from the Bentley III. | 26th Apr 1938 | Box 168a \ 1 img105 | |
| Temporary instrument board arrangement for model B.50, focusing on testing lighting efficiency. | 16th Aug 1938 | Box 168a \ 1 img106 | |
| Instrument illumination for the Wraith, detailing changes to lamp and dimmer resistance. | 28th Jun 1938 | Box 168a \ 1 img107 | |
| Parts list for the Wraith model's instrument illumination, including required components and wiring. | 1st Jul 1938 | Box 168a \ 1 img108 | |
| Parts list and instructions for an instrument board unit, including bulbs and a temporary die suggestion. | 16th Aug 1938 | Box 168a \ 1 img109 | |
| Results of life tests on 2.5-volt and 12-volt lamps for instrument lighting. | 16th Aug 1938 | Box 168a \ 1 img110 | |
| Brief on the reliability and enhanced life of a two 12-volt lamp scheme for lighting instruments. | 31th Aug 1938 | Box 168a \ 1 img111 | |
| Burnt out bulbs and a faulty dimmer switch on a car's instrument panel. | 1st Sep 1938 | Box 168a \ 1 img112 | |
| Parts and blueprints for the instrument boards of 2nd Bentley 50 and 3rd Bentley III chassis. | 15th Sep 1938 | Box 168a \ 1 img113 | |
| Instructions regarding the arrangement of instrument board wiring and the sourcing of specific components. | 20th Sep 1936 | Box 168a \ 1 img114 | |
| Requesting an update to the instrument patch on vehicle 27.G.VI. | 20th Sep 1936 | Box 168a \ 1 img115 | |
| Order request for instrument board components for Chassis 10.B.W. & 3.B.50. | 21th Dec 1938 | Box 168a \ 1 img116 | |
| Note on sourcing an electric clock and festoon lamps for experimental cars. | 21th Dec 1938 | Box 168a \ 1 img117 | |
| Requesting an update to the instrument board lighting for car WXA.2. | 30th Dec 1938 | Box 168a \ 1 img118 | |
| List of parts and instructions for the instrument board of a Bentley Chassis 10.B.V. | 12th Jan 1939 | Box 168a \ 1 img119 | |
| The order of various instrument board components for the Bentley 'Corniche' 14.B.V. | 27th Feb 1939 | Box 168a \ 1 img120 | |
| The necessary materials and blueprints for the Bentley 'Corniche' 14.B.V. model's instrument board, lamps, horns, and fittings. | 5th Mar 1939 | Box 168a \ 1 img121 | |
| The blueprint and ordering instructions for a petrol gauge for an experimental chassis with an 18-gallon tank. | 6th Mar 1939 | Box 168a \ 1 img122 | |
| Sending blueprints for an instrument lamp for specific Bentley chassis models. | 9th Sep 1939 | Box 168a \ 1 img123 | |
| Order specifications for speedometers, drives and wing lamps for Bentley Chassis 11.B.V & 12.B.V. | 5th May 1939 | Box 168a \ 1 img124 | |
| Provision of a blueprint for an 18-gallon petrol gauge for specific experimental chassis. | 29th Mar 1939 | Box 168a \ 1 img125 | |
| Request for an instrument lamp to complete the instrument board for a Bentley chassis. | 30th Mar 1939 | Box 168a \ 1 img126 | |
| Order for rheostats and woodscrews for a Bentley chassis. | 30th Mar 1930 | Box 168a \ 1 img127 | |
| Unsatisfactory dimmer and testing a resistance unit for a Bentley V instrument board. | 4th Apr 1939 | Box 168a \ 1 img128 | |
| Overheating Smith's Dimmer Switch on the Bentley V instrument board, and a request for a rheostat for testing. | 5th Apr 1939 | Box 168a \ 1 img129 | |
| Faulty resistance unit for instrument lights and a request to order replacements for the Bentley V chassis. | 12th May 1939 | Box 168a \ 1 img130 | |
| Requesting the examination and testing of ignition and fuel warning lights from S. Smith & Sons as a potential replacement for Lucas lights. | 19th Apr 1939 | Box 168a \ 1 img131 | |
| Record of an addition (7190) concerning a cut-out switch, lights, quantities ordered and issued. | 28th Apr 1939 | Box 168a \ 1 img132 | |
| Notification supplying blueprints for an Electric Clock (Dupulse Type) and requesting an order of one per chassis for various models. | 24th Apr 1939 | Box 168a \ 1 img133 | |
| Comparison report between Lucas and Smith manufactured warning lights. | 27th Apr 1939 | Box 168a \ 1 img134 | |
| Comparison of the effectiveness and construction of Lucas and Smith warning lamps. | 1st Apr 1939 | Box 168a \ 1 img135 | |
| Proposal for an improved, smaller, and cheaper inspection lamp socket and plug assembly to replace existing fittings. | 29th Apr 1939 | Box 168a \ 1 img136 | |
| Proposal to change the purchasing and fitting process for speedometer and revolution counter drives on experimental cars. | 1st May 1939 | Box 168a \ 1 img137 | |
| Confirming speedometer calibration settings for Bentley chassis 11.B.V. and 12.B.V. | 2nd May 1939 | Box 168a \ 1 img138 | |
| Necessity and implementation of a master switch on the instrument board, detailing past issues and proposed solutions. | 5th May 1939 | Box 168a \ 1 img139 | |
| Parts required to complete the instrument board for Bentley 'One Offa' Chassis 4.B.50. | 19th May 1939 | Box 168a \ 1 img140 | |
| Ordering a speedometer pending axle and tyre information and distributing instrument board layout blueprints. | 19th May 1939 | Box 168a \ 1 img141 | |
| The instrument board layout and blueprint for chassis 12.B.V. | 23th May 1939 | Box 168a \ 1 img142 | |
| Blueprints for various Petrol Gauges and Speedometers for the Bentley V instrument board. | 23th May 1939 | Box 168a \ 1 img143 | |
| Notice regarding the issue of an instrument with a dial reading up to 600 p.s.m. | 25th Mar 1929 | Box 168a \ 1 img144 | |
| Parts for a Bentley 50 Instrument Board. | 26th May 1939 | Box 168a \ 1 img145 | |
| Request to order Smith Warning Lights for testing on Bentley Cars. | 26th May 1939 | Box 168a \ 1 img146 | |
| Request to obtain ignition and fuel warning lights for a Bentley Instrument Board from Messrs Smith Ltd. | 1st Jun 1939 | Box 168a \ 1 img147 | |
| Proposal for a master switch system to control current on the instrument board. | 5th Jun 1939 | Box 168a \ 1 img148 | |
| Providing blueprints for a Speedometer for the Bentley 14.B.V. 'Corniche' chassis. | 6th Jun 1939 | Box 168a \ 1 img149 | |
| Failures of the Lucas warning light unit due to poor contact. | 7th Jun 1939 | Box 168a \ 1 img150 | |
| Scheme concerning temporary instrument board brackets for a Bentley S. dashboard. | 1st Apr 1939 | Box 168a \ 1 img151 | |
| Requesting an order for a speedometer for chassis 4.S.50, calibrated to 657 r.p.m. | 1st Jun 1930 | Box 168a \ 1 img152 | |
| The dispatch of blueprints for the Silver Ripple 1.R.I. instrument board. | 14th Jun 1939 | Box 168a \ 1 img153 | |
| Approval of a scheme for current control on the instrument board. | 14th Jun 1939 | Box 168a \ 1 img154 | |
| Blueprints for a Petrol Gauge for the Silver Phantom instrument board. | 20th Jul 1939 | Box 168a \ 1 img155 | |
| Short memo asking about the completion of the instrument board drawing. | 2nd Mar 1940 | Box 168a \ 1 img156 | |
| Letter from S. Smith & Sons to Mr. W.A. Robotham rescheduling a proposed meeting. | 7th Mar 1940 | Box 168a \ 1 img157 | |
| Design, modifications, and requirements for the Silver Ripplet .R.2 instrument board. | 14th Mar 1940 | Box 168a \ 1 img158 | |
| Letter to S. Smith & Sons, Ltd. concerning the design and layout of instrument boards. | 16th Mar 1940 | Box 168a \ 1 img159 | |
| Letter from S. Smith & Sons regarding instrument facia design, with reference to heater and wireless provisions. | 20th Mar 1940 | Box 168a \ 1 img160 | |
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